Talk:Hough transform: Difference between revisions
→Can I get some pseudo-code...and possibly an amen: Thoughts
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:::::::::: Is the TCL implementation correct in the first place? I've tested my MATLAB code against other test inputs like the one given on the wikipedia page for the hough transform and my output was correct in those cases. But, the output from my MATLAB code and the TCL code disagree for the pentagon. --[[User:Cferri|Chris Ferri]]
::::::::::: Based on your output image alone, I can see that your MATLAB code iterates a half-circle and has both negative and positive rho. The TCL implementation (mistakenly) iterates two full circles (only one is needed), and only positive rho. The output image is a plot of theta on the X and rho on the Y, with the top-left corner being 0,0. Obviously your implementation's output wouldn't match the TCL implementation. Does that mean that the TCL is wrong? Or is the MATLAB wrong? Or are they different ways of doing the same basic thing, with correspondingly different outputs? --[[User:Coderjoe|Coderjoe]] 01:17, 10 August 2010 (UTC)
:::::::::::: Hm. Well, it's a sinusoidal function, so I think it means the Tcl output image is only twice as wide as necessary. It'd be like mapping sin(theta) from zero to 4pi, instead of -pi to pi. You're correct in that that makes it incompatible as a comparison without including theta range and pixel mapping details in the task description. In this case, I think that falls somewhere akin to specifying input/output file formats. It doesn't change the core logic, but it does change interpretation of the thing. --[[User:Short Circuit|Michael Mol]] 01:29, 10 August 2010 (UTC)
==PNG Image==
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