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  • Getting 256 colors out of ruby-ncurses

    - by push.cx
    I've got 256 colors working great in my terminal (test scripts here), but it stops working when I use ncurses (via Ruby-ncurses). Printing the escape sequences given on that page works fine, but when I initialize ncurses 'puts' stops working and I can't output the colors with any of the various ncurses color changing/string output functions I've found. What gives?

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  • 256 colors, foreground and background

    - by push.cx
    This is a tale of two scripts and is related to a previous question. The two scripts are at http://gist.github.com/50692. The ansi.rb script displays all 256 colors on all 256 background colors. The ncurses.rb script displays all 256 foreground colors but the background displays the basic 16 and then seems to cycle through various attributes like blinking and reverse video. So what gives? Is this the bug in ncurses that it uses a signed integer for color pairs? (ie 'tput colors' says 256 but 'tput pairs' says 32767 instead 65536) It seems like if that were the case the first half of the colors pairs would display properly but the second half would repeat or get into the attributes as the int wraps.

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  • Any reliable polygon normal calculation code?

    - by Jenko
    Do you have any reliable face normal calculation code? I'm using this but it fails when faces are 90 degrees upright or similar. // the normal point var x:Number = 0; var y:Number = 0; var z:Number = 0; // if is a triangle with 3 points if (points.length == 3) { // read vertices of triangle var Ax:Number, Bx:Number, Cx:Number; var Ay:Number, By:Number, Cy:Number; var Az:Number, Bz:Number, Cz:Number; Ax = points[0].x; Bx = points[1].x; Cx = points[2].x; Ay = points[0].y; By = points[1].y; Cy = points[2].y; Az = points[0].z; Bz = points[1].z; Cz = points[2].z; // calculate normal of a triangle x = (By - Ay) * (Cz - Az) - (Bz - Az) * (Cy - Ay); y = (Bz - Az) * (Cx - Ax) - (Bx - Ax) * (Cz - Az); z = (Bx - Ax) * (Cy - Ay) - (By - Ay) * (Cx - Ax); // if is a polygon with 4+ points }else if (points.length > 3){ // calculate normal of a polygon using all points var n:int = points.length; x = 0; y = 0; z = 0 // ensure all points above 0 var minx:Number = 0, miny:Number = 0, minz:Number = 0; for (var p:int = 0, pl:int = points.length; p < pl; p++) { var po:_Point3D = points[p] = points[p].clone(); if (po.x < minx) { minx = po.x; } if (po.y < miny) { miny = po.y; } if (po.z < minz) { minz = po.z; } } if (minx > 0 || miny > 0 || minz > 0){ for (p = 0; p < pl; p++) { po = points[p]; po.x -= minx; po.y -= miny; po.z -= minz; } } var cur:int = 1, prev:int = 0, next:int = 2; for (var i:int = 1; i <= n; i++) { // using Newell method x += points[cur].y * (points[next].z - points[prev].z); y += points[cur].z * (points[next].x - points[prev].x); z += points[cur].x * (points[next].y - points[prev].y); cur = (cur+1) % n; next = (next+1) % n; prev = (prev+1) % n; } } // length of the normal var length:Number = Math.sqrt(x * x + y * y + z * z); // if area is 0 if (length == 0) { return null; }else{ // turn large values into a unit vector x = x / length; y = y / length; z = z / length; }

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  • SAL and SAR by 0 errors

    - by Roy McAvoy
    I have discovered a bug in some assembly code I have been working with but can't figure how to fix it. When shifting left by 0 the result ends up being 0 instead of jut the number. The same applies when shifting to the right. Any and all help is much appreciated. function sal(n,k:integer):integer; begin asm cld mov cx, k @1: sal n, 1 loop @1 end; sal:= n; end; function sar(n,k:integer):integer; begin asm cld mov cx, k @1: sar n, 1 loop @1 end; sar:=n; end; I have tried to changed them in the following way and it still does not work properly. function sal(n,k:integer):integer; begin asm cld mov cx, k jcxz @done @1: sal n, 1 loop @1 @done: end; sal:= n; end; function sar(n,k:integer):integer; begin asm cld mov cx, k jcxz @done @1: sar n, 1 loop @1 @done: end; sar:=n; end;

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  • Center text inside a circle on a canvas

    - by jax
    I have the coordinates of the center of a circle where I need to draw some text. The circle may be larger or smaller depending on the attributes I have specified. I have set the center horizontally using mTextBrush.setTextAlign(Align.CENTER);. The problem is that I can't figure out a way to center the text vertically. (See "Draw the counter" below) //Text Brush setup mTextBrush = new Paint(Paint.ANTI_ALIAS_FLAG); mTextBrush.setColor(Color.BLACK); mTextBrush.setTextSize(1/10*mMaxSize); mTextBrush.setTextAlign(Align.CENTER); mTextBrush.setStyle(Paint.Style.STROKE); private void drawSmallTimer(Canvas canvas) { //Variable cache int radiusLocalCache = this.mRadius; int cx = radiusLocalCache+(radiusLocalCache/2); int cy = radiusLocalCache-(radiusLocalCache/2); int radius = radiusLocalCache/3; //Draw the background circle canvas.drawCircle(cx, cy, radius, mBackgroundBrush); //Draw the outline stroke canvas.drawCircle(cx, cy, radius, mStrokeBrush); //Draw the counter String text = String.valueOf(mCounter); canvas.drawText(text, cx, cy, mTextBrush); }

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  • Run Rails 3 app on a Rails 2 server/machine?

    - by chucknelson
    I'm trying to run a Rail 3 (3.0.10) app on a shared joyent smartmachine server (I don't have root access) which has Rails 2 (2.3.11) installed , and I'm not sure what to do after I freeze my Rails 3 app with bundle install --deployment. It seems like with the Rails 3 and bundler gems not being installed on the server locally, my app isn't even recognizing the local version of Rails I have frozen with my app. Has anyone gotten this to work, or have any advice? The server runs Apache, and I think I can get lighttpd installed too - but I'd rather stay with Apache if I can. Also, if it matters, Passenger is not an installed gem either...and I'm not sure I can freeze that with my app. Update 11/30/2011 12:30 PM EST Bundler is not installed on this server, either. Not sure if having that would enable the new Rails 3 "freeze" (bundle --deployment) to work or not...

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  • where are user name and pasword saved in windows native vpn connection?

    - by Tîrêj
    I am using time freeze program but I can not save my free vpn user name and pasword. Since user name and pasword changed daily I have to unfreeze change pasword then freeze again. In the time freeze there is option to excusing file and folder. if I find the location of vpn setting that save the user name and pasword, I will have ability to use without unfreezing and re freezing. There is a location with path %userprofile%\AppData\Roaming\Microsoft\Network\Connections\Pbk\ that contain vpn configurations except user name and password. I need the location that store user name and password.

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  • rhino embedding

    - by neheh
    Anyone understands the rhino javascript Contexts? I cannot find any useful documentation about it. My main problem is the Context.exit() (really should be cx.exit()) which from what I understand exits the context associated with the current thread? Does that mean I need to keep track of what which thread does? main thread: Context cx; cx.evaluateReader( ... ) // load some function start thread 2 thread 2: Object o= scope.get("methodname", scope); ((Function)o).call( ... ) I do not plan on doing multithreading but what if the different setups comes from different threads?

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  • CRMIT Solution´s CRM++ Asterisk Telephony Connector Achieves Oracle Validated Integration with Oracle Sales Cloud

    - by Richard Lefebvre
    To achieve Oracle Validated Integration, Oracle partners are required to meet a stringent set of requirements that are based on the needs and priorities of the customers. Based on a Telephony Application Programming Interface (TAPI) framework the CRM++ Asterisk Telephony Connector integrates the Asterisk telephony solutions with Oracle® Sales Cloud. "The CRM++ Asterisk Telephony Connector for Oracle® Sales Cloud showcases CRMIT Solutions focus and commitment to extend the Customer Experience (CX) expertise to our existing and potential customers," said Vinod Reddy, Founder & CEO, CRMIT Solutions. "Oracle® Validated Integration applies a rigorous technical review and test process," said Kevin O’Brien, senior director, ISV and SaaS Strategy, Oracle®. "Achieving Oracle® Validated Integration through Oracle® PartnerNetwork gives our customers confidence that the CRM++ Asterisk Telephony Connector for Oracle® Sales Cloud has been validated and that the products work together as designed. This helps reduce deployment risk and improves the user experience for our joint customers." CRM++ is a suite of native Customer Experience solutions for Oracle® CRM On Demand, Oracle® Sales Cloud and Oracle® RightNow Cloud Service. With over 3000+ users the CRM++ framework helps extend the Customer Experience (CX) and the power of Customer Relations Management features including Email WorkBench, Self Service Portal, Mobile CRM, Social CRM and Computer Telephony Integration.. About CRMIT Solutions CRMIT Solutions is a pioneer in delivering SaaS-based customer experience (CX) consulting and solutions. With more than 200 certified customer relationship management (CRM) consultants and more than 175 successful CRM deployments globally, CRMIT Solutions offers a range of CRM++ applications for accelerated deployments including various rapid implementation and migration utilities for Oracle® Sales Cloud, Oracle® CRM On Demand, Oracle® Eloqua, Oracle® Social Relationship Management and Oracle® RightNow Cloud Service. About Oracle Validated Integration Oracle Validated Integration, available through the Oracle PartnerNetwork (OPN), gives customers confidence that the integration of complementary partner software products with Oracle Applications and specific Oracle Fusion Middleware solutions have been validated, and the products work together as designed. This can help customers reduce risk, improve system implementation cycles, and provide for smoother upgrades and simpler maintenance. Oracle Validated Integration applies a rigorous technical process to review partner integrations. Partners who have successfully completed the program are authorized to use the “Oracle Validated Integration” logo. For more information, please visit Oracle.com at http://www.oracle.com/us/partnerships/solutions/index.html.

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  • DNASTREAM’s RapidLaunch Oracle Accelerate solution for RightNow

    - by Richard Lefebvre
    The Oracle RightNow Accelerate solution from DNASTREAM allows each Customer to enjoy quicker deployment and earlier time to benefits from this SAAS Customer Experience solution. At the start of the project, a full suite of E-Learning simulations & materials is provided by DNASTREAM to match the customer’s processes. This RapidLaunch content library for RightNow can be leveraged by our customers early in their project implementations bringing significant cost efficiencies, time reduction and improved user adoption to their project roll outs. Solution Profile: This Oracle Accelerate solution is based on Oracle RightNow CX that includes Content management, Contact management, Incident management, Customer Portal, Closed incident Survey, Standard reports. As an additional option there is available the Oracle RightNow CX Chat implementation. For more information about RightNow and the DNASTREAM Accelerate solution, visit the Oracle Accelerate microsite or contact www.dnastream.com

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  • Mark Hurd on Oracle's Strategy to Be the Best

    - by Tuula Fai
    Mark Hurd, President of Oracle, energized a packed audience this Monday morning at OpenWorld with his keynote outlining Oracle’s four-pillar strategy: Be the leader at every level of the technology stack—applications, middleware, database, operating system, virtual machine, servers, and storage Vertically integrate these levels into differentiated solutions Offer Fusion, the next generation of applications, which are modular and can run in the cloud, on-premise, or both (hybrid) Deliver this technology portfolio through industry lenses to help Oracle customers solve their problems while innovating and becoming more efficient. Hurd’s message resonated throughout Monday’s Customer Experience (CX) sessions as we learned about Oracle’s investment in integrating its best-of-breed CX solutions to deliver an end-to-end suite that addresses every part of the customer lifecycle. For example, in the area of customer service, Oracle is developing enhancements to help contact center agents: Better understand customer needs through social listening tools that are integrated with knowledge management Empower themselves with internal collaboration and mobility tools Adapt to customer needs by engaging them through chat during a service or commerce interaction so they can deliver a great customer experience while transforming from a cost- into a profit center.

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  • What's new in the RightNow November 2012 release?

    - by Richard Lefebvre
    What new in the RightNow November 2012? In order to find out, please watch this tutorial with imbedded demonstration or read the November 2012 Release notes.   News Facts The November 2012 release of     Oracle’s RightNow CX Cloud Service marks the completion of development efforts for 2012 and continues Oracle’s commitment to enhancing the Oracle RightNow offering following the acquisition. New release delivers key capabilities designed to help organizations improve customer experiences in order to increase customer acquisition and retention, while reducing total cost of ownership. Part of the Oracle Cloud, Oracle RightNow CX Cloud Service now integrates Oracle RightNow Chat Cloud Service with Oracle Engagement Engine Cloud Service, helping organizations intelligently and proactively engage with customers through the right channel at the right time. Chat solutions have emerged as an important component of a cross-channel customer experience strategy. According to Forrester Research, Inc., chat adoption has risen dramatically between 2009 and 2011 from 19% to 37%, and it has the highest satisfaction level of all customer service channels at 62% satisfaction. (*) To help companies deliver enhanced customer experiences, Oracle has made significant investments in Oracle RightNow Chat Cloud Service throughout 2012. With the addition of rules-based engagement to existing capabilities such as co-browse, mobile chat, and cross-channel knowledge integration with the contact center, all delivered via the cloud, Oracle RightNow Chat Cloud Service is differentiated as the industry-leading chat solution. The Oracle Cloud offers a broad portfolio of software as-a-service applications, including Oracle Customer Service and Support Cloud Service, which is based on the Oracle RightNow CX Cloud Service. New Capabilities Key Oracle RightNow Chat Cloud Service and other cross-channel capabilities include: Chat Business Rules, with over 70 built-in rule conditions, leverage the Oracle Engagement Engine to help enable organizations capture rich visitor data and invoke complex actions and triggers. Chat Business Rules allow granular control over when to engage a customer via the chat channel based on customer behavior, customer profile information and operational information. Click-to-Call provides the option for a customer to engage with a live agent over the phone during the Web browsing experience. Chat Availability Controls provide organizations with the ability to throttle volume through the chat channel based on real-time agent availability and wait time thresholds. This ability to manage the channel more efficiently allows organizations to provide a better experience to customers using the chat channel. Strategic and Operational Chat Channel Analytics provide better insight into channel and agent productivity and utilization and effectiveness with both out-of-the-box reports and ad hoc reports. New chat channel analytics provide comprehensive metrics with full data transparency. Background Service Updates improve high availability metrics for Oracle RightNow Chat Cloud Service during service update periods, setting the industry leading standard for sales and service delivery to customers via the chat channel. Additional Capabilities include: Improved Web developer tools for more efficient self-service user interface design Improved administration for enhanced user sessions management Increased cross-channel community collaboration Enhanced extensibility widgets and syndication management Streamlined content management and analytics capabilities Read the full announcement here

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  • A Complete Customer Experience Solution (3 of 3 in 'No Customer Left Behind' Series)

    - by Kathryn Perry
    A guest post by David Vap, Group Vice President, Oracle Applications Product Development In my previous post, I talked about taking three concrete steps to improve your customers' overall experiences: 1) understand your customer, 2) empower your ecosystem, and 3) adapt your business. To do these effectively and efficiently, it's important to find the right technology that can bridge the gaps across your channels, interactions, departments, and repositories. Oracle has spent the past three years and more than six billion dollars acquiring and developing some of the world's best-of-breed applications. The result is the most comprehensive customer experience (CX) portfolio offering in the World - bar none: ATG Best in Class Selling Experiences Fatwire Best in Class Marketing Experiences Inquira Best in Class Support Experiences Endecca Best in Class Search Experiences RightNow Best in Class Service Experiences Vitrue & Involver Best in Class Social Marketing Collective Intellect Best In Class Social Listening We don't expect organizations to eat the CX elephant in one bite, nor should they try to. There are key strategic initiatives within each of the four main pillars of our customer experience offering for which we deliver solutions: 1. Customer Experience for Marketing Social Listening and Engagement Social Marketing Marketing Websites Demand Generation and Lead Management Marketing and Loyalty Management 2. Customer Experience for Commerce Search, Navigation & Content Delivery Cross-Channel Commerce Targeting & Product Recommendations Social Commerce Order Management & Fulfillment Retail Store Operations 3. Customer Experience for Sales Sales Force Automation Social Selling Territory & Quota Management Revenue Forecasting Partner Relationship Management Quote to Cash Incentive Compensation 4. Customer Experience for Service Cross-Channel Customer Service Knowledge Management Social Customer Service Eligibility Management Contracts, Assets, and Entitlements Industry-Specific Solutions eBilling Oracle's customer experience portfolio is socially infused at each layer of our pillars rather than simply bolted on as a side process. This combines with the power of the Cloud to run the parts of the solution that need the access, efficiency, and agility from a managed infrastructure. You can get the compliance control from on-premise backbone infrastructure systems that run your business and don't change that often. Please take advantage of our teams of Oracle customer experience professionals and our key agency and technology partner ecosystem. They can help you develop strategic solution roadmaps that build and deliver customer experience and that are tailored to your business needs and objectives. No one has built a better customer service portfolio to manage the entire customer journey than Oracle. It is backed by CX thought leadership programs, a commitment from our executives, and a worldview that your technology decisions must be driven by your customer experiences to succeed. If you’d like to follow up on this conversation, please leave a comment or contact me at [email protected]. You can get more information on Oracle’s complete customer experience solution here.

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  • Can WinRT really be used at just the boundaries?

    - by Bret Kuhns
    Microsoft (chiefly, Herb Sutter) recommends when using WinRT with C++/CX to keep WinRT at the boundaries of the application and keep the core of the application written in standard ISO C++. I've been writing an application which I would like to leave portable, so my core functionality was written in standard C++, and I am now attempting to write a Metro-style front end for it using C++/CX. I've had a bit of a problem with this approach, however. For example, if I want to push a vector of user-defined C++ types to a XAML ListView control, I have to wrap my user-defined type in a WinRT ref/value type for it to be stored in a Vector^. With this approach, I'm inevitably left with wrapping a large portion of my C++ classes with WinRT classes. This is the first time I've tried to write a portable native application in C++. Is it really practical to keep WinRT along the boundaries like this? How else could this type of portable core with a platform-specific boundary be handled?

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  • Help with this optimization

    - by Milo
    Here is what I do: I have bitmaps which I draw into another bitmap. The coordinates are from the center of the bitmap, thus on a 256 by 256 bitmap, an object at 0.0,0.0 would be drawn at 128,128 on the bitmap. I also found the furthest extent and made the bitmap size 2 times the extent. So if the furthest extent is 200,200 pixels, then the bitmap's size is 400,400. Unfortunately this is a bit inefficient. If a bitmap needs to be drawn at 500,500 and the other one at 300,300, then the target bitmap only needs to be 200,200 in size. I cannot seem to find a correct way to draw in the components correctly with a reduced size. I figure out the target bitmap size like this: float AvatarComposite::getFloatWidth(float& remainder) const { float widest = 0.0f; float widestNeg = 0.0f; for(size_t i = 0; i < m_components.size(); ++i) { if(m_components[i].getSprite() == NULL) { continue; } float w = m_components[i].getX() + ( ((m_components[i].getSprite()->getWidth() / 2.0f) * m_components[i].getScale()) / getWidthToFloat()); float wn = m_components[i].getX() - ( ((m_components[i].getSprite()->getWidth() / 2.0f) * m_components[i].getScale()) / getWidthToFloat()); if(w > widest) { widest = w; } if(wn > widest) { widest = wn; } if(w < widestNeg) { widestNeg = w; } if(wn < widestNeg) { widestNeg = wn; } } remainder = (2 * widest) - (widest - widestNeg); return widest - widestNeg; } And here is how I position and draw the bitmaps: int dw = m_components[i].getSprite()->getWidth() * m_components[i].getScale(); int dh = m_components[i].getSprite()->getHeight() * m_components[i].getScale(); int cx = (getWidth() + (m_remainderX * getWidthToFloat())) / 2; int cy = (getHeight() + (m_remainderY * getHeightToFloat())) / 2; cx -= m_remainderX * getWidthToFloat(); cy -= m_remainderY * getHeightToFloat(); int dx = cx + (m_components[i].getX() * getWidthToFloat()) - (dw / 2); int dy = cy + (m_components[i].getY() * getHeightToFloat()) - (dh / 2); g->drawScaledSprite(m_components[i].getSprite(),0.0f,0.0f, m_components[i].getSprite()->getWidth(),m_components[i].getSprite()->getHeight(),dx,dy, dw,dh,0); I basically store the difference between the original 2 * longest extent bitmap and the new optimized one, then I translate by that much which I would think would cause me to draw correctly but then some of the components look cut off. Any insight would help. Thanks

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  • determine collision angle on a rotating body

    - by jorb
    update: new diagram and updated description I have a contact listener set up to try and determine the side that a collision happened at relative to the a bodies rotation. One way to solve this is to find the value of the yellow angle between the red and blue vectors drawn above. The angle can be found by taking the arc cosine of the dot product of the two vectors (Evan pointed this out). One of my points of confusion is the difference in domain of the atan2 function html canvas coordinates and the Box2d rotation information. I know I have to account for this somehow... SS below questions: Does Box2D provide these angles more directly in the collision information? Am I even on the right track? If so, any hints? I have the following javascript so far: Ship.prototype.onCollide = function (other_ent,cx,cy) { var pos = this.body.GetPosition(); //collision position relative to body var d_cx = pos.x - cx; var d_cy = pos.y - cy; //length of initial vector var len = Math.sqrt(Math.pow(pos.x -cx,2) + Math.pow(pos.y-cy,2)); //body angle - can over rotate hence mod 2*Pi var ang = this.body.GetAngle() % (Math.PI * 2); //vector representing body's angle - same magnitude as the first var b_vx = len * Math.cos(ang); var b_vy = len * Math.sin(ang); //dot product of the two vectors var dot_prod = d_cx * b_vx + d_cy * b_vy; //new calculation of difference in angle - NOT WORKING! var d_ang = Math.acos(dot_prod); var side; if (Math.abs(d_ang) < Math.PI/2 ) side = "front"; else side = "back"; console.log("length",len); console.log("pos:",pos.x,pos.y); console.log("offs:",d_cx,d_cy); console.log("body vec",b_vx,b_vy); console.log("body angle:",ang); console.log("dot product",dot_prod); console.log("result:",d_ang); console.log("side",side); console.log("------------------------"); }

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  • C2C - Customer 2 Cloud Program

    - by Hartmut Wiese
    What´s in it for partners? A special Webinar for EMEA partners The Blog Entry is referring to this EMEA CRM Community blog entry here. The new Oracle Customer 2 Cloud (C2C) Program offers sizeable CX Cloud business opportunities for our partners into their existing Siebel, Peoplesoft or Oracle eBusiness Suite customers installed base, leveraging financial incentives that allow customers switching part of their On Premises solutions' maintenance fees against Cloud subscriptions from the market leading provider of CX Cloud business solutions. Look at this introduction video to have a first feeling about the C2C program and then join us on Tuesday June 10th at 9am CET (8am UK) to find out how you and your customers can benefit from this program to secure existing Siebel, Peoplesoft or Oracle eBusiness Suite accounts while generating new business opportunities. Register here! added by Hartmut Wiese: JD Edwards is not explicitly mentioned for this program but I also did not found a remark that it is not included.

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  • How to Get from Here to There

    - by Tom Caldecott-Oracle
    Six Oracle OpenWorld Sessions to Help Transform Your Business You’re a bit cloudy on how to implement an enterprise resource planning (ERP), human capital management (HCM), or customer experience (CX) cloud environment. You want to make a move to improve the productivity of your employees with mobility.   Let Oracle Consulting be your guide at Oracle OpenWorld. You can choose from six conference sessions that focus on business transformation—for ERP, HCM, CX, analytics, mobility, and private cloud. Oracle Consulting experts and your industry peers will share insights, best-in-class methodologies, and critical lessons learned in transforming businesses with new solutions built on Oracle technology.  Learn more. And enjoy the journey.

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  • Why are there 3 conflicting OpenCV camera calibration formulas?

    - by John
    I'm having a problem with OpenCV's various parameterization of coordinates used for camera calibration purposes. The problem is that three different sources of information on image distortion formulae apparently give three non-equivalent description of the parameters and equations involved: (1) In their book "Learning OpenCV…" Bradski and Kaehler write regarding lens distortion (page 376): xcorrected = x * ( 1 + k1 * r^2 + k2 * r^4 + k3 * r^6 ) + [ 2 * p1 * x * y + p2 * ( r^2 + 2 * x^2 ) ], ycorrected = y * ( 1 + k1 * r^2 + k2 * r^4 + k3 * r^6 ) + [ p1 * ( r^2 + 2 * y^2 ) + 2 * p2 * x * y ], where r = sqrt( x^2 + y^2 ). Assumably, (x, y) are the coordinates of pixels in the uncorrected captured image corresponding to world-point objects with coordinates (X, Y, Z), camera-frame referenced, for which xcorrected = fx * ( X / Z ) + cx and ycorrected = fy * ( Y / Z ) + cy, where fx, fy, cx, and cy, are the camera's intrinsic parameters. So, having (x, y) from a captured image, we can obtain the desired coordinates ( xcorrected, ycorrected ) to produced an undistorted image of the captured world scene by applying the above first two correction expressions. However... (2) The complication arises as we look at OpenCV 2.0 C Reference entry under the Camera Calibration and 3D Reconstruction section. For ease of comparison we start with all world-point (X, Y, Z) coordinates being expressed with respect to the camera's reference frame, just as in #1. Consequently, the transformation matrix [ R | t ] is of no concern. In the C reference, it is expressed that: x' = X / Z, y' = Y / Z, x'' = x' * ( 1 + k1 * r'^2 + k2 * r'^4 + k3 * r'^6 ) + [ 2 * p1 * x' * y' + p2 * ( r'^2 + 2 * x'^2 ) ], y'' = y' * ( 1 + k1 * r'^2 + k2 * r'^4 + k3 * r'^6 ) + [ p1 * ( r'^2 + 2 * y'^2 ) + 2 * p2 * x' * y' ], where r' = sqrt( x'^2 + y'^2 ), and finally that u = fx * x'' + cx, v = fy * y'' + cy. As one can see these expressions are not equivalent to those presented in #1, with the result that the two sets of corrected coordinates ( xcorrected, ycorrected ) and ( u, v ) are not the same. Why the contradiction? It seems to me the first set makes more sense as I can attach physical meaning to each and every x and y in there, while I find no physical meaning in x' = X / Z and y' = Y / Z when the camera focal length is not exactly 1. Furthermore, one cannot compute x' and y' for we don't know (X, Y, Z). (3) Unfortunately, things get even murkier when we refer to the writings in Intel's Open Source Computer Vision Library Reference Manual's section Lens Distortion (page 6-4), which states in part: "Let ( u, v ) be true pixel image coordinates, that is, coordinates with ideal projection, and ( u ~, v ~ ) be corresponding real observed (distorted) image coordinates. Similarly, ( x, y ) are ideal (distortion-free) and ( x ~, y ~ ) are real (distorted) image physical coordinates. Taking into account two expansion terms gives the following: x ~ = x * ( 1 + k1 * r^2 + k2 * r^4 ) + [ 2 p1 * x * y + p2 * ( r^2 + 2 * x^2 ) ] y ~ = y * ( 1 + k1 * r^2 + k2 * r^4 ] + [ 2 p2 * x * y + p2 * ( r^2 + 2 * y^2 ) ], where r = sqrt( x^2 + y^2 ). ... "Because u ~ = cx + fx * u and v ~ = cy + fy * v , … the resultant system can be rewritten as follows: u ~ = u + ( u – cx ) * [ k1 * r^2 + k2 * r^4 + 2 * p1 * y + p2 * ( r^2 / x + 2 * x ) ] v ~ = v + ( v – cy ) * [ k1 * r^2 + k2 * r^4 + 2 * p2 * x + p1 * ( r^2 / y + 2 * y ) ] The latter relations are used to undistort images from the camera." Well, it would appear that the expressions involving x ~ and y ~ coincided with the two expressions given at the top of this writing involving xcorrected and ycorrected. However, x ~ and y ~ do not refer to corrected coordinates, according to the given description. I don't understand the distinction between the meaning of the coordinates ( x ~, y ~ ) and ( u ~, v ~ ), or for that matter, between the pairs ( x, y ) and ( u, v ). From their descriptions it appears their only distinction is that ( x ~, y ~ ) and ( x, y ) refer to 'physical' coordinates while ( u ~, v ~ ) and ( u, v ) do not. What is this distinction all about? Aren't they all physical coordinates? I'm lost! Thanks for any input!

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  • Delay On Assembler?

    - by Norm
    Hey, I want to know how i can do delay (Timer) on assembler 16 bit on PC. Thank You for helping, Norm. OS: Windows CODE: delay: inc bx cmp bx,WORD ptr[time] je delay2 jmp delay delay2: inc dx cmp dx,WORD ptr[time2] je delay3 jmp delay mov bx,0 delay3: inc cx cmp cx,WORD ptr[time3] je Finish_delay jmp delay its not work good i need less complicated code

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  • Is READ UNCOMMITTED / NOLOCK safe in this situation?

    - by Ben Challenor
    I know that snapshot isolation would fix this problem, but I'm wondering if NOLOCK is safe in this specific case so that I can avoid the overhead. I have a table that looks something like this: drop table Data create table Data ( Id BIGINT NOT NULL, Date BIGINT NOT NULL, Value BIGINT, constraint Cx primary key (Date, Id) ) create nonclustered index Ix on Data (Id, Date) There are no updates to the table, ever. Deletes can occur but they should never contend with the SELECT because they affect the other, older end of the table. Inserts are regular and page splits to the (Id, Date) index are extremely common. I have a deadlock situation between a standard INSERT and a SELECT that looks like this: select top 1 Date, Value from Data where Id = @p0 order by Date desc because the INSERT acquires a lock on Cx (Date, Id; Value) and then Ix (Id, Date), but the SELECT acquires a lock on Ix (Id, Date) and then Cx (Date, Id; Value). This is because the SELECT first seeks on Ix and then joins to a seek on Cx. Swapping the clustered and non-clustered index would break this cycle, but it is not an acceptable solution because it would introduce cycles with other (more complex) SELECTs. If I add NOLOCK to the SELECT, can it go wrong in this case? Can it return: More than one row, even though I asked for TOP 1? No rows, even though one exists and has been committed? Worst of all, a row that doesn't satisfy the WHERE clause? I've done a lot of reading about this online, but the only reproductions of over- or under-count anomalies I've seen (one, two) involve a scan. This involves only seeks. Jeff Atwood has a post about using NOLOCK that generated a good discussion. I was particularly interested in a comment by Rick Townsend: Secondly, if you read dirty data, the risk you run is of reading the entirely wrong row. For example, if your select reads an index to find your row, then the update changes the location of the rows (e.g.: due to a page split or an update to the clustered index), when your select goes to read the actual data row, it's either no longer there, or a different row altogether! Is this possible with inserts only, and no updates? If so, then I guess even my seeks on an insert-only table could be dangerous. Update: I'm trying to figure out how snapshot isolation works. It seems to be row-based, where transactions read the table (with no shared lock!), find the row they are interested in, and then see if they need to get an old version of the row from the version store in tempdb. But in my case, no row will have more than one version, so the version store seems rather pointless. And if the row was found with no shared lock, how is it different to just using NOLOCK?

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  • CenterPoint in CGContextAddArc ?

    - by Mikhail Naimy
    Hi , i am drawing Arc through CGCOntext.I want to draw a string in the center Point of Arc.how can i fond the center point in the Arc which has been drawn through CGContext. CGContextSetAlpha(ctx, 0.5); CGContextSetRGBFillColor(ctx, color.red, color.green, color.blue, color.alpha ); CGContextMoveToPoint(ctx, cX, cY); CGContextAddArc(ctx, cX, cY, radious+10, (startDeg-90)*M_PI/180.0, (endDeg-90)*M_PI/180.0, 0); CGContextClosePath(ctx); CGContextFillPath(ctx);

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  • Converting HTML TAG Object to JSON Object

    - by cooldude
    Hi, I want to convert the html tag objects to json object in the javascript in order to send them to the server from the javascript. As i have to save these objects at the Ruby on Rails server. These HTML objects is the canvas tag object and the graphics objects created using CAKE API. I have used the stringify function but it is not working. Here is my code: var CAKECanvas = new Canvas(document.body, 1000,1000); var canvas=CAKECanvas.canvas; var text=document.createElement('textarea'); text.id="text"; text.rows="100"; text.cols="200"; document.body.appendChild(text); canvas.style.borderStyle="solid"; canvas.style.borderColor="black"; var rect= new Circle(); rect.radius=100; rect.centered=true; rect.cx=Math.random() * 500; rect.cy= Math.random() * 300; rect.stroke= false; rect.fill= "red"; rect.xDir = Math.random() > 0.5?1:-1; rect.yDir = Math.random() > 0.5?1:-1; var obj=new Object; var count = 0,k; for (k in rect) { if (rect.hasOwnProperty(k)) { count++; obj[k]=rect[k]; } } alert(count); rect.addFrameListener(function(t, dt) { this.cx += this.xDir * 50 * dt/1000; this.cy += this.yDir * 50 * dt/1000; if (this.cx > 550) { this.xDir = -1; } if (this.cx < 50) { this.xDir = 1; } if (this.cy > 350) { this.yDir = -1; } if (this.cy < 50) { this.yDir = 1; } } ); CAKECanvas.append(rect); var carAsJSON = JSON.stringify(obj); /////////////////ERROR

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  • Strategies to Defeat Memory Editors for Cheating - Desktop Games

    - by ashes999
    I'm assuming we're talking about desktop games -- something the player downloads and runs on their local computer. Many are the memory editors that allow you to detect and freeze values, like your player's health. How do you prevent cheating via memory-modifiation? What strategies are effective to combat this kind of cheating? For reference, I know that players can: - Search for something by value or range - Search for something that changed value - Set memory values - Freeze memory values I'm looking for some good ones. Two I use that are mediocre are: Displaying values as a percentage instead of the number (eg. 46/50 = 92% health) A low-level class that holds values in an array and moves them with each change. (For example, instead of an int, I have a class that's an array of ints, and whenever the value changes, I use a different, randomly-chosen array item to hold the value)

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  • How to Power Cycle Your Gadgets To Fix Freezes and Other Problems

    - by Chris Hoffman
    Have you ever had a smartphone, laptop, tablet, or any other electronic gadget become unresponsive? The surefire way to recover from the freeze – assuming it’s not a hardware problem – is by power-cycling the gadget. Most geeks know that pulling and reinserting a device’s battery will force it to recover from a freeze and boot right back up, but what if the device doesn’t have a removable battery? Image Credit: Alan Levine on Flickr Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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