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• Optical Character Recognition software recommendations?

  - by Tim

  I have seen some ebooks/papers that were apparently scanned from their paper versions but the text in the ebooks/papers can amazingly be copied out. I suppose the directly-scanned versions must have been processed by some Optical Character Recognition software. So I would like to know what are the recommended Optical Character Recognition softwares? Especially those that are either for Ubuntu or free? If those for Windows are far more superior, please let me know as well. I am particularly interested in those OCRs that can accept a scanned pdf file as input and still produce as output another pdf file that looks the same as the input one but with its text copyable. Thanks and regards! Please limit one software per answer

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• ubuntu 14 painfully slow on dell r200

  - by sirmonkey

  I didn't notice it at first. The machines (there is 20 plus) are to be used a simple file servers. It wasn't until samba just wouldn't act right that I installed a desktop gui and started more diagnoseing the problem did I catch the slow preformance... I've tested 4 servers they all suck. And windows 7 runs fantastic on them. I have Google and searched. But nothing to explain this. The easy test is dmesg is so slow you can almost read it. I'm guessing it's an apic or cpu power management issue. What output would you all like????? It is a core2 machine with 4Gb of ram. On board data.

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• RPi and Java Embedded GPIO: Connecting LEDs

  - by hinkmond

  Next, we need some low-level peripherals to connect to the Raspberry Pi GPIO header. So, we'll do what's called a "Fry's Run" in Silicon Valley, which means we go shop at the local Fry's Electronics store for parts. In this case, we'll need some breadboard jumper wires (blue wires in photo), some LEDs, and some resistors (for the RPi GPIO, 150 ohms - 300 ohms would work for the 3.3V output of the GPIO ports). And, if you want to do other projects, you might as well by a breadboard, which is a development board with lots of holes in it. Ask a Fry's clerk for help. Or, better yet, ask the customer standing next to you in the electronics components aisle for help. (Might be faster) So, go to your local hobby electronics store, or go to Fry's if you have one close by, and come back here to the next blog post to see how to hook these parts up. Hinkmond

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• Can't display RSSI values in Wireshark

  - by Giovanni Soldi

  I am trying to analyze the up-link Wireless traffic generated by my Sony Ericsson phone and captured by my D-Link router, on which I installed the DD-WRT firmware. To do this, first I log in the router and enable the prism0 interface by typing the command: wl -i eth1 monitor 1 and then I start to capture the packets by typing: tcpdump -i prism0 ether src xx:xx:xx:xx:xx:xx -s0 -w /tmp/smbshare/sony_ericsson_test.pcap where xx:xx:xx:xx:xx:xx is the MAC address of my Sony Ericsson phone. After a while I transfer the sony_ericsson_test.pcap file to my computer and open it with Wireshark program. In order to display the RSSI values I follow this procedure: Edit - Preferences... - Columns - Press "Add" button - As "Field type" I choose "IEEE 802.11 RSSI" and finally I choose name "Power" and click on "Apply" button. The problem is that the column "Power" is empty with no RSSI values. Does Anyone has a clue on why are RSSI values not displayed? Maybe I am missing a passage. Looking forward to hearing from anyone of you! Thanks in advance for your help!

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• How can I convert .mp4 files to .3gp using ffmpeg?

  - by harisibrahimkv

  I would like to download a few videos from youtube and convert them to 3gp so that I can play them on my phone. I would like to know how this can be done using ffmpeg. I tried the various results on the net only to get the following errors. I used: ffmpeg -i dil.mp4 -sameq -ab 64k -ar 44100 dilenada.3gp I got: Unsupported codec for output stream #0.1 Seems stream 0 codec frame rate differs from container frame rate: 2000.00 (2000/1) - 29.92 (359/12) I used: ffmpeg -y -i dil.mp4 -r 20 -s 352x288 -b 400k -acodec libfaac -ac 1 -ar 2000 -ab 24k dilenada.3gp I got: Seems stream 0 codec frame rate differs from container frame rate: 2000.00 (2000/1) -> 29.92 (359/12) Unknown encoder 'libfaac' What am I doing wrong?

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• Is there a historical computer peripherals or accessories museum or even just a current list?

  - by zimmer62

  Thinking about all the unique and different peripherals I've owned over the years, from ISA capture cards, to parallel port controlled shutter glasses for 3d games. I've seen many many accessory or computer peripherals come and go. The nostalgia of these things is a lot of fun. I tried to find some sort of historical time-line or list but what mostly turned up is computers themselves. I'm more interested in the mice, scanners, the weird adapters that shouldn't exist, short run very rare products, strange devices from computer shows in the 80's and 90's... Hardware you might find in a geeks basement that would be completely useless now, but was the coolest thing around when it was new. An example would be a drawing tablet I had for my TI-99 computer, or the audio tape player accessory for a C64 which let you save files to audio tapes, An ISA card that did the same for PC's hooked up to a VCR. Remember that IBM-PC Jr upgrade kit, that added a floppy drive, more memory and the AT switch in the back? I'd love to find either a wiki, or a list that has already been assembled which contain many of these weird (or common) accessories. I've had so many over the years I suppose I could start a wiki here if such a list doesn't already exist.

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• algorithm to print the digits in the correct order

  - by Aga Waw

  I've been trying to write an algorithm that will print separately the digits from an integer. I have to write it in Pseudocode. I know how to write an algorithm that reverse the digits. digi(n): while n != 0: x = n % 10 n = n // 10 print (x) But I don't know how to write an algorithm to print the digits in the correct order. f.eg. the input is integer 123467 and the output is: 1 2 3 4 6 7 The numbers will be input from the user, and we cannot convert them to a string. I just need help gettin started on writing algorithms. Thanks

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• Install Samba 3.0.24 on Ubuntu Server 10.04 from Source

  - by Nilpo

  Has anyone had any luck compiling and installing Samba 3.0.24 on Ubuntu 10.04? I'm trying to set up realtime virus scanning on Samba shares (ClamAV) using the legacy version of Samba as it is the latest release supported by samba-vscan-0.3.6b. I'm no expert at this but I think I have all of the dependencies covered and I'm following the documentation with the source code but I'm getting errors as if there is a problem with the source code. I downloaded the source directly from http://ftp.samba.org/pub/samba/stable/samba-3.0.24.tar.gz After running ./configure and make, I get the following error. Compiling client/mount.cifs.c client/mount.cifs.c: In function ‘main’: client/mount.cifs.c:1068: error: ‘PATH_MAX’ undeclared (first use in this function) client/mount.cifs.c:1068: error: (Each undeclared identifier is reported only once client/mount.cifs.c:1068: error: for each function it appears in.) make: *** [client/mount.cifs.o] Error 1 You can view the full output log here. Can anyone help me get this installed or suggest another means of implementing realtime virus scanning on Samba shares?

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• Sound works for only one user at a time

  - by Patrick

  I've noticed that sound becomes unavailable to me when someone else is logged into my machine and playing music (or has facebook open) in the other account. I've had to ask them to unlock their account and turn it off so I can get sound in my own stuff. Even in sound preferences, the hardware itself disappears and output is "dummy sound". Is there a way to prevent this from happening? What would be really good is if I could turn down the volume (or mute entirely) all the sounds on all other accounts on a per-user basis from my sound preferences without affecting whatever setting they have - essentially saying whenever user A is logged in, all sounds from user B's account are muted and anything from user C's account is at 50% while I can still have my own at full volume.

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• Cannot boot Win7 after updating to ubuntu 11.10

  - by angryInsomniac

  I had a dual boot setup on my system, with ubuntu 11.04 and Win7. Yesterday I updated ubuntu to 11.10. Now , I cannot seem to be able to load Win7 , I do see an entry for it on the boot menu. I select that entry and then the screen goes black , with everything coming to a standstill. I tried to wait for it to respond but nothing happened. I went through the forums and tried "grub-update" but when I do that , nothing really happens. I am not sure of this , but I get no output from grub for upto 10 minutes ( can grub-update be made verbose ) How can I fix this and get back to booting both OS'es properly ?

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• How to control fan speed and temperatures on Asus A8Js laptop running Ubuntu Server?

  - by Azeworai

  Hi, I have tried installing asusfan and lm-sensors but I'm unable to control my fans to cool my laptop down sufficiently. Currently it overheats at about 100 degrees celsius and my sensors output somehow does not have any fan information on it: jackson@OLYMPIA:~$ sensors acpitz-virtual-0 Adapter: Virtual device temp1: +69.0°C (crit = +110.0°C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +66.0°C (high = +100.0°C, crit = +100.0°C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +66.0°C (high = +100.0°C, crit = +100.0°C) I have checked my bios and there isn't any fan settings there. I can consistently overheat just by converting a video via Handbrake. I have ubuntu-desktop installed for a GUI. Is there a way for me to control my fans to start spinning before it reaches a critical temperature and kills itself?

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• Confused with X.ORG version number

  - by caligula

  There is my trouble: I'm trying to install ATI drivers on my Dell Vostro 3350 laptop. On the AMD's site I followed steps to determine which driver should I use. After selecting what hardware I use I got a link to download amd-driver-installer-12-3-x86.x86_64.run and below was a description of that driver that it was compatible with X.Org version from 6.7 to 7.6. And I do not know what version of X.Org my Ubuntu uses. Cause after googling I found that version is 7.6 in Ubuntu 11.10. But after typing: X -version I got the output: X.Org X Server 1.10.4 Release Date: 2011-08-19 X Protocol Version 11, Revision 0 So what is the exact version of X.Org in Ubuntu 11.10 and how should one reliably determine it? Can anyone construe? Thanks.

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• How to get distinct values from the List&lt;T&gt; with LINQ

  - by Vincent Maverick Durano

  Recently I was working with data from a generic List<T> and one of my objectives is to get the distinct values that is found in the List. Consider that we have this simple class that holds the following properties: public class Product { public string Make { get; set; } public string Model { get; set; } }   Now in the page code behind we will create a list of product by doing the following: private List<Product> GetProducts() { List<Product> products = new List<Product>(); Product p = new Product(); p.Make = "Samsung"; p.Model = "Galaxy S 1"; products.Add(p); p = new Product(); p.Make = "Samsung"; p.Model = "Galaxy S 2"; products.Add(p); p = new Product(); p.Make = "Samsung"; p.Model = "Galaxy Note"; products.Add(p); p = new Product(); p.Make = "Apple"; p.Model = "iPhone 4"; products.Add(p); p = new Product(); p.Make = "Apple"; p.Model = "iPhone 4s"; products.Add(p); p = new Product(); p.Make = "HTC"; p.Model = "Sensation"; products.Add(p); p = new Product(); p.Make = "HTC"; p.Model = "Desire"; products.Add(p); p = new Product(); p.Make = "Nokia"; p.Model = "Some Model"; products.Add(p); p = new Product(); p.Make = "Nokia"; p.Model = "Some Model"; products.Add(p); p = new Product(); p.Make = "Sony Ericsson"; p.Model = "800i"; products.Add(p); p = new Product(); p.Make = "Sony Ericsson"; p.Model = "800i"; products.Add(p); return products; }   And then let’s bind the products to the GridView. protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { Gridview1.DataSource = GetProducts(); Gridview1.DataBind(); } }   Running the code will display something like this in the page: Now what I want is to get the distinct row values from the list. So what I did is to use the LINQ Distinct operator and unfortunately it doesn't work. In order for it work is you must use the overload method of the Distinct operator for you to get the desired results. So I’ve added this IEqualityComparer<T> class to compare values: class ProductComparer : IEqualityComparer<Product> { public bool Equals(Product x, Product y) { if (Object.ReferenceEquals(x, y)) return true; if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null)) return false; return x.Make == y.Make && x.Model == y.Model; } public int GetHashCode(Product product) { if (Object.ReferenceEquals(product, null)) return 0; int hashProductName = product.Make == null ? 0 : product.Make.GetHashCode(); int hashProductCode = product.Model.GetHashCode(); return hashProductName ^ hashProductCode; } }   After that you can then bind the GridView like this: protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { Gridview1.DataSource = GetProducts().Distinct(new ProductComparer()); Gridview1.DataBind(); } }   Running the page will give you the desired output below: As you notice, it now eliminates the duplicate rows in the GridView. Now what if we only want to get the distinct values for a certain field. For example I want to get the distinct “Make” values such as Samsung, Apple, HTC, Nokia and Sony Ericsson and populate them to a DropDownList control for filtering purposes. I was hoping the the Distinct operator has an overload that can compare values based on the property value like (GetProducts().Distinct(o => o.PropertyToCompare). But unfortunately it doesn’t provide that overload so what I did as a workaround is to use the GroupBy,Select and First LINQ query operators to achieve what I want. Here’s the code to get the distinct values of a certain field. protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { DropDownList1.DataSource = GetProducts().GroupBy(o => o.Make).Select(o => o.First()); DropDownList1.DataTextField = "Make"; DropDownList1.DataValueField = "Model"; DropDownList1.DataBind(); } } Running the code will display the following output below:   That’s it! I hope someone find this post useful!

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• Can't activate "mirror display"

  - by Nemo Peeters

  I have Ubuntu 12.04 on a Dell latitude E6410, I have a problem when using the VGA output I always have dual monitor and can't switch on the "mirror display" toggle under systems setting/displays. It's rather annoying when having to do presentation with a video projector. the option "mirror display" is in light grey and I can"t tick the box. Thanks for those who might have an idea how to resolve this? update: driver is: Intel® Ironlake Mobile x86/MMX/SSE2 card something like this ? description: VGA compatible controller product: Core Processor Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 02 width: 64 bits clock: 33MHz

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• Ripping MP3s in Rhythmbox Ubuntu 12.10 (64 bit)?

  - by James Fellows Yates

  I installed a couple of days ago Ubuntu 12.10 (64 bit). I today tried ripping a CD in the MP3 format. However, whenever I try to rip, it says it is missing an extra multimedia plugin "Gstreamer extra plug-ins (i386)". I then try to install the :i386 version of the gstreamer-ugly plugins, but then I get the same problem but with the id3-demuxer (or something similar) The Terminal output I get from both problems (but replace the "MPEG-1 Layer 3 (MP3) encoder" with the "ID3-demuxer" name) is: james@clefairy:~$ rhythmbox (rhythmbox:24122): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed Rhythmbox-Message: Missing plugin: gstreamer|0.10|rhythmbox|MPEG-1 Layer 3 (MP3) encoder|encoder-audio/mpeg, mpegversion=(int)1, layer=(int)3 /usr/lib/python2.7/dist-packages/gobject/constants.py:24: Warning: g_boxed_type_register_static: assertion `g_type_from_name (name) == 0' failed import gobject._gobject It doesn't help that each time I have to install/remove the entire Gstreamer-ugly collection each time - I can't find that specific file. The CD plays fine, it's the ripping plugin that doesn't seem to work. I didn't have this problem previously on 12.04 (64 bit).

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• Using HTML entities in XML Literals (Avner Aharoni)

  One of the common use-cases of XML literals is creating HTML. However, HTML entities cannot be used in XML literals since LINQ to XML directly supports only the Data type definitions (DTD) defined in the XML 1.0 spec. You can read more about it here. The workaround is to use the Unicode representation of the entity, although its not as readable as the HTML entities, the output is the same. Here are two examples of HTML entities from the XHTML spec :   Entity...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Using HTML entities in XML Literals (Avner Aharoni)

  One of the common use-cases of XML literals is creating HTML. However, HTML entities cannot be used in XML literals since LINQ to XML directly supports only the Data type definitions (DTD) defined in the XML 1.0 spec. You can read more about it here. The workaround is to use the Unicode representation of the entity, although its not as readable as the HTML entities, the output is the same. Here are two examples of HTML entities from the XHTML spec :   Entity...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Upgrade to 14.04 broke gsettings

  - by zrneely

  I have a cron job which runs every 30 minutes that changes the background image by running this bash script: #!/bin/bash export DISPLAY=:0 export GSETTINGS_BACKEND=dconf wpdir="/home/username/Pictures/wallpapers/" prefix="file://" file=`ls $wpdir | shuf -n 1` gsettings set org.gnome.desktop.background picture-uri "$prefix$wpdir$file" This worked perfectly until I upgraded to 14.04. Now, running the script produces this output: (process:27459): dconf-WARNING **: failed to commit changes to dconf: Could not connect: Connection refused What can I do to fix this? Google didn't turn up any useful results. EDIT: I noticed that running this does change the background displayed on the lock screen, but it does not affect the desktop background.

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• How do I grep in a variable?

  - by Ashfame

  How to do a grep in a variable? I have stored the wget output in a variable and I need to extract out some strings from it. Like the content of the variable is upgrade http://wordpress.org/download/ http://wordpress.org/wordpress-3.0.5.zip 3.0.5 en_US 4.3 4.1.2 I need to check if the string contains the word upgrade, so I can do a simple grep and then check the exit status of it by $? and proceed. But how can I get the value 3.0.5 which is actually the fourth word? And how to actually grep in a variable?

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• 2 Printers 1 Queue

  - by Shazburg

  My issue: When an order is processed, the same document needs to be printed on two printers. My proposed solution: Create a single queue in CUPS with a backend script that spits the job out to the two real printers queues. My problem: Documentation. Maybe I'm looking at every ring around the bullseye, but I can't find anything that lays out the rules for writing a CUPS backend script. In the end, I have several questions: Is there already an option to do this in CUPS that I've missed? The line I use to add my queue is "lpadmin -p MultiPass -E -v multipass -P Generic PostScript Printer". But DeviceURI is bad unless I specify a directory like "-v multipass:/tmp". Why is this? For testing, my script does nothing but capture ARGV and write it out to a text file one line per argument. Problem is, I'm getting nothing. Logs show the job as successful, but I'm pretty sure my meager attempt at a backend isn't even being run. I've tried to keep this question brief, so please ask for more info as I'm sure I've left out the most important part in all this. Honestly, I'm just done chasing my own tail. Thank you for your time.

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• Connecting to unsecured wireless network

  - by Sanchez

  I would like to know what information is public and can be intercepted in a non-open, but unsecured wireless network. Moreover, is there anything I can do to make it more "secure", other than using https connection whenever possible. In more details, I recently discovered (with surprise) that the wireless network in my school is actually unsecured. Although not everyone can connect to it (you need a student ID), I am told that certain softwares like Wireshark would be able to intercept the data. Since I have been using the network for all private purposes (email, facebook etc), I do feel quite insecure now and would like to understand the situation a bit better. I installed Wireshark and tried to play with it but all I can see are something alien to me. In any case, all I see seems to come directly/indirectly from my IP address, and I have long thought that usually different computers in the same wireless network would be assigned different addresses. Am I wrong? If not, then I feel very confused about what information is actually being captured (potentially by other users in the network, since I don't think I could capture activities of others in the same network anyway), and whether it's safe to use the network at all. (Gambling on others in the same network showing good behaviour is apparently not an option.) Thank you.

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• How to control fan speed and temperatures on Asus A8Js laptop?

  - by Azeworai

  Hi, I have tried installing asusfan and lm-sensors but I'm unable to control my fans to cool my laptop down sufficiently. Currently it overheats at about 100 degrees celsius and my sensors output somehow does not have any fan information on it: jackson@OLYMPIA:~$ sensors acpitz-virtual-0 Adapter: Virtual device temp1: +69.0°C (crit = +110.0°C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +66.0°C (high = +100.0°C, crit = +100.0°C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +66.0°C (high = +100.0°C, crit = +100.0°C) I have checked my bios and there isn't any fan settings there. I can consistently overheat just by converting a video via Handbrake. I have ubuntu-desktop installed for a GUI. Is there a way for me to control my fans to start spinning before it reaches a critical temperature and kills itself?

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• How to unit test image processing code?

  - by rold2007

  I'm working in image processing (mainly OCR) and I wonder how I should integrate unit tests in my development. I'm already using unit tests for more "common" type of code but when dealing with image processing code I'm not sure how to deal with it. This kind of code always need some image data input/output and mocking this is not obvious. For now I'm mostly doing integration tests but they take a while to run and I would like some ideas on how to break down this kind of code into unit tests so that I can run them more quickly.

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• Why do Core Data sqlite table columns start with 'Z'?

  - by Dia

  I was looking at the sqlite table that Core Data generates and noticed that all table columns start with 'Z'. I realize this is an implementation detail, but I was curious as to why that's the case and if there was a design decision involved in this. Anyone happen to know or guess why? Here's a sample schema output of Core Data sqlite database: sqlite .schema CREATE TABLE ZPOST ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZPOSTID INTEGER, ZUSER INTEGER, ZCREATEDAT TIMESTAMP, ZTEXT VARCHAR ); CREATE TABLE ZUSER ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZUSERID INTEGER, ZAVATARIMAGEURLSTRING VARCHAR, ZUSERNAME VARCHAR ); CREATE TABLE Z_METADATA (Z_VERSION INTEGER PRIMARY KEY, Z_UUID VARCHAR(255), Z_PLIST BLOB); CREATE TABLE Z_PRIMARYKEY (Z_ENT INTEGER PRIMARY KEY, Z_NAME VARCHAR, Z_SUPER INTEGER, Z_MAX INTEGER);

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• Free LINQPad is a great way to learn LINQ!

  - by CatherineRussell

  LINQPad is a great way to learn LINQ: it comes loaded with 500 examples from the book, C# 4.0 in a Nutshell.  There's no better way to experience the coolness of LINQ and functional programming. LINQPad is more than just a LINQ tool: it's an ergonomic C#/VB scratchpad that instantly executes any C#/VB expression, statement block or program with rich output formatting – the ultimate in dynamic development. Put an end to those hundreds of Visual Studio Console projects cluttering your source folder! Best of all, LINQPad standard edition is free and can run without installation (or with a low-impact setup). The executable is 3MB and is self-updating. To get it, go to: http://www.linqpad.net/

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