C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Pixel Manipulations          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message PyPK Guest Posted: Wed Sep 28, 2005 8:38 pm    Post subject: Pixel Manipulations Does anyone know of a simple implementation for detecting straight line ..So something like if we have a 2D arary of pixel elements representing a particular Image. How can we identify lines in this Image. for example: ary = {{1,1,1,1,1}, {1,1,0,0,0}, {1,0,1,0,0}, {1,0,0,1,0}, {1,0,0,0,1}} So if 'ary' represents pxl of an image which has a horizontal line(row 0),a vertical line(col 0) and a diagonal line(diagonal of ary). then basically I want identify any horizontal or vertical or diagonal line anywhere in the pxl array and return true if its composed of only lines else false... Back to top Howard Guest Posted: Wed Sep 28, 2005 8:45 pm    Post subject: Re: Pixel Manipulations "PyPK" <superprad (AT) gmail (DOT) com> wrote Quote: Does anyone know of a simple implementation for detecting straight line .So something like if we have a 2D arary of pixel elements representing a particular Image. How can we identify lines in this Image. for example: ary = {{1,1,1,1,1}, {1,1,0,0,0}, {1,0,1,0,0}, {1,0,0,1,0}, {1,0,0,0,1}} So if 'ary' represents pxl of an image which has a horizontal line(row 0),a vertical line(col 0) and a diagonal line(diagonal of ary). then basically I want identify any horizontal or vertical or diagonal line anywhere in the pxl array and return true if its composed of only lines else false... Not really a c++ language question, but... Loop through that row or column (or diagonal), and if any cell is 0, return false. Otherwise, return true if the loop completes. Implement that in c++ code, and if you have trouble, show us your attempt at the code, let us know exactly which part is the problem, and what that problem is (i.e., you get a compiler error, a run-time error, or simply incorrect behavior). -Howrd Back to top Victor Bazarov Guest Posted: Wed Sep 28, 2005 8:47 pm    Post subject: Re: Pixel Manipulations PyPK wrote: Quote: Does anyone know of a simple implementation for detecting straight line .So something like if we have a 2D arary of pixel elements representing a particular Image. How can we identify lines in this Image. for example: ary = {{1,1,1,1,1}, {1,1,0,0,0}, {1,0,1,0,0}, {1,0,0,1,0}, {1,0,0,0,1}} So if 'ary' represents pxl of an image which has a horizontal line(row 0),a vertical line(col 0) and a diagonal line(diagonal of ary). then basically I want identify any horizontal or vertical or diagonal line anywhere in the pxl array and return true if its composed of only lines else false... Do you have a C++ _language_ question? V Back to top ajitho Guest Posted: Thu Sep 29, 2005 2:25 am    Post subject: Re: Pixel Manipulations Hi: Look up the "Hough transform" Back to top PyPK Guest Posted: Thu Sep 29, 2005 3:38 pm    Post subject: Re: Pixel Manipulations was trying to understand it..is there any demo code that could demonstrate its behaviour Back to top Victor Bazarov Guest Posted: Thu Sep 29, 2005 3:51 pm    Post subject: Re: Pixel Manipulations PyPK wrote: Quote: was trying to understand it..is there any demo code that could demonstrate its behaviour There probably is. Try googling for it. Again, any particular algorithms for doing something particular are not really on topic here. Try a different newsgroup. V Back to top mlimber Guest Posted: Thu Sep 29, 2005 4:00 pm    Post subject: Re: Pixel Manipulations PyPK wrote: Quote: was trying to understand it..is there any demo code that could demonstrate its behaviour The key word for this concept is "edge detection". Any book on image processing will cover it, and I'm sure you can find some code online. If you have a C++ question, post it here. Otherwise, you should probably post to sci.image.processing or comp.dsp. Cheers! --M Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.