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  • Machine Learning Algorithm for Parallel Nodes

    - by FreshCode
    I want to apply machine learning to a classification problem in a parallel environment. Several independent nodes, each with multiple on/off sensors, can communicate their sensor data with the goal of classifying an event defined by a heuristic, training data or both. Each peer will be measuring the same data from their unique perspective and will attempt to classify the result while taking into account that any neighbouring node (or its sensors or just the connection to the node) could be faulty. Nodes should function as equal peers and determine the most likely classification by communicating their results. Ultimately each node should make a decision based on their own sensor data and their peers' data. If it matters, false positives are OK (albeit undesirable) but false negatives are totally unacceptable. Given that each final classification will receive good or bad feedback, what would be an appropriate machine learning algorithm to approach this problem with if the nodes could communicate with each other to determine the most likely classification?

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  • FLVPlayback, go fullscreen smooth?

    - by Marcel
    Hello, Im looking into using and customizing FLVPlayback in a project. How to go about this is clear, but I noticed 1 anoying thing. When going fullscreen, first Flash player goes fullscreen and then briefly shows the FLVPlayback component in its original size, before jumping to show the video itself fullscreen. I noticed on Youtube this doesnt happen. How can I escape this 'flicker' and have the video go fullscreen as the videos do on youtube? Thanks a lot for any tips! Marcel

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  • HMM for perspective estimation in document image, can't understand the algorithm

    - by maximus
    Hello! Here is a paper, it is about estimating the perspective of binary image containing text and some noise or non text objects. PDF document The algorithm uses the Hidden Markov Model: actually two conditions T - text B - backgrouond (i.e. noise) It is hard to understand the algorithm itself. The question is that I've read about Hidden Markov Models and I know that it uses probabilities that must be known. But in this algorithm I can't understand, if they use HMM, how do they get those probabilities (probability of changing the state from S1 to another state for example S2)? I didn't find anything about training there also in that paper. So, if somebody understands it, please tell me. Also is it possible to use HMM without knowing the state change probabilities?

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  • IPC: Communication between Qt4 and MONO processes (on linux)

    - by elcuco
    I have to connect a Qt4 application to a mono Application. The current proof of concept uses network sockets (which is nice, I can debug using nc on the command line). But I am open to new suggestions. What are my alternatives? Edit: The original application stack is split into two parts: server + client. The client is supposed to show pictures and videos. Since we found that this is not possible in a sane way in Mono, we split the client into two parts: server - client - GUI In the original implementation the client+GUI were the same application. Now client is in C# (running on Mono), and the GUI is Qt4. Rewriting the client in Qt4 is not an option. Right now the communication between the client and the GUI is been done using TCP sockets through localhost. I am looking for better implementations.

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  • GPU YUV to RGB. Worth the effort?

    - by Jaime Pardos
    Hello, I have to convert several full PAL videos (720x576@25) from YUV 4:2:2 to RGB, in real time, and probably a custom resize for each. I have thought of using the GPU, as I have seen some example that does just this (except that it's 4:4:4 so the bpp is the same in source and destiny)-- http://www.fourcc.org/source/YUV420P-OpenGL-GLSLang.c However, I don't have any experience with using GPU's and I'm not sure of what can be done. The example, as I understand it, just converts the video frame to YUV and displays it in the screen. Is it possible to get the processed frame instead? Would it be worth the effort to send it to the GPU, get it transformed, and sending it again to main memory, or would it kill performance? Being a bit platform-specific, assuming I work on windows, is it possible to get an OpenGL or DirectDraw surface from a window so the GPU can draw directly to it?

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  • Best solution for a comment table for multiple content types

    - by KRTac
    I'm currently designing a comments table for a site I'm building. Users will be able to upload images, link videos and add audio files to the profile. Each of these types of content must be commentable. Now I'm wondering what's the best approach to this. My current options are: 1. to have one big comments table and a link tables for every content type (comments_videos, ...) with comment_id and _id. 2. to have comments separated by the type of content their for. So each type of content would have his own comments table with the comments for that type.

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  • Retrieve default camera video extension from Windows Mobile

    - by kornelijepetak
    Is there any way to find out what is the default video extension for camera application? I am using CameraCaptureDialog to make the user use the camera and save the image to a specific file which then I consume in the application. However, there is a problem with the videos. Emulator gives .wmv video file while some devices I've been testing save to mp4 format. Is there any reliable way to find out what is the format in which the phone that is running the application saves the file?

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  • Lightbox: how to parse the lightbox dynamically loaded html content (AJAX)

    - by Patrick
    hi, I'm using a (modal) lightbox on a page of my website to display my nodes. I'm using some plugins such as an external jquery-plugin for tooltips and the drupal plugin jQuery Media (to load flash video player for some video file-fields). These plugins are loaded when the main page load and they parse the html content of the page. When I dynamically load the lightbox (and I use AJAX to update its content) the html inside the lightbox is not parse... so no tooltips, no videos. how can I solve this ? Should I trigger the plugins again from Lightbox callback function ? Or should I use something else instead of the lightbox ? Thanks

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  • How do people prove the correctness of Computer Vision methods?

    - by solvingPuzzles
    I'd like to pose a few abstract questions about computer vision research. I haven't quite been able to answer these questions by searching the web and reading papers. How does someone know whether a computer vision algorithm is correct? How do we define "correct" in the context of computer vision? Do formal proofs play a role in understanding the correctness of computer vision algorithms? A bit of background: I'm about to start my PhD in Computer Science. I enjoy designing fast parallel algorithms and proving the correctness of these algorithms. I've also used OpenCV from some class projects, though I don't have much formal training in computer vision. I've been approached by a potential thesis advisor who works on designing faster and more scalable algorithms for computer vision (e.g. fast image segmentation). I'm trying to understand the common practices in solving computer vision problems.

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  • access netStream or movieClip from a loop AS2

    - by conspirisi
    I've got a load of videos var ns1:NetStream = new NetStream(nc); container1.compMa.theVideo.attachVideo(ns1); ns1.play("sukh_diesel.flv", 1); // var ns2:NetStream = new NetStream(nc); container2.compMa.theVideo.attachVideo(ns2); ns2.play("sukh_beneath.flv", 1); //and 4 more, which I've left out to be concise I want to pause them with function pauseVid(){ this.ns1.pause(); for(i=1;i<7;i++){ this["ns"+i]pause(); } } the commented out line: this.ns1.pause() works, but when I try it in a loop it can't access it?

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  • Syncing an iPod or iPhone with Cocoa

    - by Koning Baard XIV
    I'm creating an iTunes clone in Cocoa (don't ask why, it's not evil) and I want to be able to sync my iPod with it. This means: music, photos, videos and podcasts. I couldn't really find anything, since Google only shows articles about iPod touch and iPhone programming, but I'm actually creating a desktop application for Mac OS X, and I also want to be able to sync click-wheel iPods. Is there an API or should I read and write directly to the USB port? Can anyone help me? Thanks

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  • Entropy using Decision Tree's

    - by Matt Clements
    Train a decision tree on the data represented by attributes A1, A2, A3 and outcome C described below: A1 A2 A3 C 1 0 1 0 0 1 1 1 0 0 1 0 For log2(1/3) = 1.6 and log2(2/3) = 0.6, answer the following questions: a) What is the value of entropy H for the given set of training example? b) What is the portion of the positive samples split by attribute A2? c) What is the value of information gain, G(A2), of attribute A2? d) What is IFTHEN rule(s) for the decision tree?

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  • Revision Materals, other than book, for MCTS 70-536 Exam

    - by Damien
    Does anyone have any recommendations on revision materials for the MCTS 70-536 exam other than the monstrosity that is the official book? I am finding it very difficult to absorb the amount of information in the book in such a passive way (i.e just reading) it's not going in. My current approach has been to use the practise tests and make notes on the questions I was unsure about but given the wide varity of questions that could come up I am not sure if this is the correct way to do things. So is there someone with more condensed, bite-size, information to take in. Maybe videos or podcasts? Cheers!

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  • Python: wxpython wx.media.MediaCtrl - millisecond seek capability

    - by PPTim
    I've been searching for a media player that can display sub-second resolution in videos. Some pointed me to the Frame stepping functionality in MPC, but I'd like even more than that. I know from previous experience with wxPython that the wx.media.MediaCtrl both displays and (as fast as i can click with the mouse anyway) stops the video with millisecond-precision. The code is here, and runs no-problem with python +wxpython module. Has anyone come across other video players that handle this functionality, or has seen a more robust/developed video player written with wxPython that allows for this level of precision? This is possibily a one-off task so I'd like to use existing solutions if possible. Thanks.

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  • HTTP vs FTP upload

    - by Richard Knop
    I am building a large website where members will be allowed to upload content (images, videos) up to 20MB of size (maybe a little less like 15MB, we haven't settled on a final upload limit yet but it will be somewhere between 10-25MB). My question is, should I go with HTTP or FTP upload in this case. Bear in mind that 80-90% of uploads will be smaller size like cca 1-3MB but from time to time some members will also want to upload large files (10MB+). Is HTTP uploading reliable enough for such large files or should I go with FTP? Is there a noticeable speed difference between HTTP and FTP while uploading files? I am asking because I'm using Zend Framework which already has HTTP adapter for file uploads, in case I choose FTP I would have to write my own adapter for it. Thanks!

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  • Facebook Connect Publish to Stream: how do I tag a user?

    - by Sean Cannon
    I have an application that allows martial arts trickers to 'battle' each other by initiating challenges and submitting videos and whatnot. When user A challenges user B, the application posts to the user's wall (the one who initiated the challenge). My question is how do I tag user B in the wall post? It essentially says "challenged John Do to a battle". I'd like "John Do" to link to his profile just like when you manually post something on your wall and use the @ symbol. I hope this makes sense. I've tried standard html for a link, and I've tried FBML. Neither are parsed and only render as plain text on the wall post. Thanks for any help!

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  • how to play video files by using UITableView?

    - by srikanth rongali
    Hi, In my iPhone application I need to show a video image in UITableView. Each tableViewCell have video and some labels. I used the MPMoviePlayerController for showing video in full screen when the cell is selected. But, I am getting error that MPMoviePlayerController class is not there. I tried using UIWebView. But, I could not make it. How can I play a video, when the cell is selected. Some say that videos do not play in simulator. They only play when we test in device. Is it right ? Please help me with the solution. Thank You.

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  • prevent multiple login with same login credentials in php

    - by shinod
    My website has premium videos, for which users have to pay to watch it. I am sending a random user name and password to the user's email id when the payment is completed. Then I want to assure no more than one user use that login credentials simultaneously. For that I use a login_status column in database table with login credentials and change it to 1 when one user login and change to 0 when user log out. But the problem is, if the user close browser or network connection loss may happened will not update database. Then login_will be 1 undefinitely and no one can use that login credentials again. Is there any idea to accomplish my task?

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  • ffmpeg screen capture

    - by Mirai
    I wrote this script for some basic screen capture; it gets the window dimensions then uses the ffmpeg binary to record. I suspect there is a better way (maybe with the ffmpeg library), but scripting is what I know and ffmpeg generally works. Any software (other than recordmydesktop), or improvements to the script are welcome. info=`xwininfo -frame` H=`echo "$info" | grep Height | sed -E "s/^.*: ([[:digit:]]+)$/\1/"` W=`echo "$info" | grep Width | sed -E "s/^.*: ([[:digit:]]+)$/\1/"` offset=:0.0+`echo "$info" | grep Corners | sed -E "s/^.*:[[:space:]]+\+([[:digit:]]+\+[[:digit:]]+)[[:space:]]+.+/\1/" | tr + ,` /usr/local/bin/ffmpeg -f x11grab -s ${W}x${H} -r 45 -i $offset -sameq -f avi ~/videos/`date +%Y-%m-%d-%H%M%s`_vid & echo $! > /tmp/$(basename $0)-$USER

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  • What are the ways to do synchronized streaming video and text?

    - by Marc
    I would like to have two streams. One being traditional streaming video and another being text. I will also build an interface that allows the user to create the text portion while watching the video. The context of these videos are usually that of an individual being filmed doing a presentation and later the next day for example, a coach will make text annotations (structured data is a plus) with the result being the text stream. It seems this is possible with Silverlight (see the article in the latest MSDN). However, what other methods are there if any? If there any, please give the reasons for why you are recommending them. Thanks. Also, I would prefer something that inst a software as a service hosted solution, but, dont let that keep you from giving an answer. Also keep in mind, the user shouldn't have to do any re-encoding of the video source, the text stream should be separate with someway to synchronize a coach's comments to an arbitrary time stamp in the video.

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  • Embedding a YouTube Video Based on a PHP Variable

    - by jeffpm
    I have a website that I am creating for a class project. The website shows information about bands (which is stored in a mysql database). I am trying to spruce up the site a bit, and I would like to embed a YouTube video based on the band's name. Say, for instance, I have "Led Zeppelin" stored in my database. How can I take a PHP variable containing "Led Zeppelin", search YouTube using that variable, find a random video, and then embed that in the website? From the research I've done, it seems you can only embed YouTube videos if you know the exact address of the video. Thanks!

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  • ASP.NET MVC IoC usability

    - by Andrew Florko
    Hello everybody, How often do you use IoC for controllers/DAL in real projects? IoC allows to abstract application from concrete implementation with additional layer of interfaces that should be implemented. But how often concrete implementation changes? Should we really have to do job twice adding method to interface then the implementation if implementation hardly will ever be changed? I took part in about 10 asp.net projects and DAL (ORM-like and not) was never rewritten completely. Watching lots of videos I clearly understand that IoC "is cool" and the really nice way to program, but does it really needed?

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  • Play sound in mobile browser?

    - by John
    I want to make myself a web based stop watch for training that I can use on my Blackberry mobile browser. The stopwatch should count 3 minutes, then ring a bell, wait 1 minute, then ring another bell and then repeat. My problem is I can't seem to get sound to work on my blackberry browser. I tried using <embed src="bell.wav"> which works fine in the browser of a normal computer, but it doesn't make a sound on my blackberry. Should I build this stopwatch with Javascript and HTML or should I build it with flash?

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  • Programming mid-terms

    - by Dervin Thunk
    Hello. Unfortunately, (written) midterms are necessary in most university CS programs in the world. They tell us how well our students (and ourselves as teachers) are doing. Needless to say, designing midterms for a C Programming Language course is not easy. For instance, when we do program for real, we have a myriad of information at our disposal: websites, books, cheat sheets to "remember" the syntax and so on. My question is this: did you find any way, during your years at school or training, where you said: ok, this midterm evaluation of my programming skills is tough, but fair. For instance: I found "find 5 problems with this code"-type questions hard but interesting and telling. Are there any others? Thanks.

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  • iphone app submission process.

    - by Nnp
    i am done with my first iphone app (SO helps a lot..thanks). now i want to submit my app to app store for review. i can use itunes connect to submit my app.i have few questions. 1)i dont know how to create a build for release. what i mean is i dont know what profile it requires. there are help videos but they all guide to do development provisioning not for release. 2) where do i specify all app attributes like Genre and so on. 3) i dont have iTunesArtwork but it does not show in my itunes when i create distribute build. is it going to same for release. hope my question is genuine.

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