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  • Precisely Compare 2 images for differences using OpenCV

    - by YS
    Hi, I am working on a project to capture images via webcam in a predefined time interval, and continuously compare the images to a template (good image) and give an error if the difference is tolerance set. I working out using OpenCV. Would like to have advice how should I do it, e.g. best method, etc. Appreciate if any one can help me on this. Thanks.

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  • different types of parsing

    - by kostas_menu
    I have read the tutorial from ibm about xml parsing (http://www.ibm.com/developerworks/opensource/library/x-android/) In this example,there are four types of xml parsing.Dom,Sax,Android Sax and xml_pull.Could you please tell me what's the difference between these four types and when i have to use each one? Also,with every way of xml parsing in this tutorial,the feeds are shown in a listView. What i have to do in order to appear every announcement in a btn for example? thanks for your time!Merry Christmas:D

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  • Local variable vs parameter

    - by Dhana
    function doIt(param) { var localVar = param; //do lots of stuff with localVar } function doIt(param) { //do lots of stuff with param } Is there any difference in terms of efficiency between the code above?

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  • Geometric Mean: is there a built-in?

    - by doug
    i tried to find a built-in for geometric mean but couldn't. (Obviously a built-in isn't going to save me any time while working in the shell, nor do i suspect there's any difference in accuracy; for scripts i try to use built-ins as often as possible, where the (cumulative) performance gain is often noticeable. In case there isn't one (which i doubt is the case) here's mine. gm_mean = function(a){prod(a)^(1/length(a))}

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  • confusing java data structures

    - by London
    Maybe the title is not appropriate but I couldn't think of any other at this moment. My question is what is the difference between LinkedList and ArrayList or HashMap and THashMap . Is there a tree structure already for Java(ex:AVL,Black-white) or balanced or not balanced(linked list). If this kind of question is not appropriate for SO please let me know I will delete it. thank you

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  • How do I stop Chrome from pre-populating input boxes?

    - by thor
    Is there some way I can stop Chrome from auto populating input boxes? I have a page with a Sign Up form and a Log In form. In Chrome, if a user has already signed up and they've come to this page to log in, the password input box on the sign up form is populated with their password. I would really like to force the sign up fields to never auto complete. I've tried setting autocomplete="false" but this makes no difference.

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  • Why do I need the isset() function in php?

    - by Chris
    I am trying to understand the difference between this: if (isset($_POST['Submit'])) { //do something } and if ($_POST['Submit']) { //do something } It seems to me that if the $_POST['Submit'] variable is true, then it is set. Why would I need the isset() function in this case?

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  • C++[MSVC2010]: How does switch compile and how optimized and fast is it?

    - by ekul
    As I found out that I can use only numerical values in C++'s switch statements, I thought that there then must be some deeper difference between it and a bunch of if-else's. Therefore I asked myself: (How) does switch differ from if-elseif-elseif in terms of runtime speed, compile time optimization and general compilation? I'm mainly speaking of MSVC here.

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  • Why is Python so slow?

    - by Riemannliness
    Why is Python such a slow language, on average, compared to C/C++? I learned Python as my first programming language, but I've only just started with C and already I can feel and see the difference.

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  • How to make two different files (with their contents) equal using command in linux shell?

    - by user2617138
    How to make two different files (their contents) equal using terminal in Linux? Suppose i have a file A in which the content is Hello world and i have a file B in which the content is Hello worlds. Now we find the difference between the 2 files using the diff or sdiff utility. Now i want to append the contents of the 2 different files into a single file or make the two different files (their contents) equal using terminal or any other utility.

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  • Use of viewDidUnoad

    - by user338111
    What is the use of viewDidUnload and didReceiveMemoryWarning methods? When they actually get called? what are the difference between dealloc, viewDidUnload and didrecievedmemorywarning?

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  • Javascript plugin creation

    - by Aneesh
    I want to create a plugin called 'myPlugin'. Which method should I use and what is the difference between these two methods? Please tell me the advantages too. I am from designing background and not much programming knowledge. var myPlugin = { myId:"testId", create:function(){}, destroy:function(){} } OR function myPlugin() { this.myId = "testId"; this.create = function(){}; this.destroy = function(){}; }

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  • detect a postback from a radiobutton list

    - by user228777
    I am trying to detect a postback from Radiobutton list. I am trying to use following code: If Page.Request.Params.Get("__EVENTTARGET") = optDownload.UniqueID.ToString Then But Page.Request.Params.Get("__EVENTTARGET") returns "ctl00$ContentPlaceHolder1$pnlBarAccounts$i0$i2$i0$CHChecking$Acct1$optDownload$4" And = optDownload.UniqueID.ToString returns "ctl00$ContentPlaceHolder1$pnlBarAccounts$i0$i2$i0$CHChecking$Acct1$optDownload" There is a difference in last 2 characters, how do I detect a postback from Radiobutton list?

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  • How to prevent regex from stopping at the first match of alternatives ?

    - by miket2e
    If I have the string hello world , how can I modify the regex world|wo|w so that it will match all of "world", "wo" and "w" rather than just the single first match of "world" that it comes to ? If this is not possible directly, is there a good workaround ? I'm using C# if it makes a difference: Regex testRegex = new Regex("world|wo|w"); MatchCollection theMatches = testRegex.Matches("hello world"); foreach (Match thisMatch in theMatches) { ... }

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