Dbug my Sobel image filter - written but having problems!!

Cancelled Posted Feb 26, 2005 Paid on delivery
Cancelled Paid on delivery

I am writting a circle finding program using a Sobel filter and a Hough transform. However, I'm currently having problems getting my Sobel to work! I've written all the code (which uses a library called IPLib (included in zip file), but image I get out for a horizontal Sobel is wrong. If you don't know, Sobels look like this; (Horizontal) -1 -2 -1 0 0 0 1 2 1 (Vertical) -1 0 1 -2 0 2 -1 0 1 I'm applying them to pgm (greyscale) images which have pixel values between 0 and 255. I believe my problemis coming from the values wrapping over or under these values (thresholding just produces completely black or white images!). I've included my code (circle.c) and a working, but longer version (prog.c) - I need you to get the Sobel functions working so the program writes out a pgm that actually has the edges highlighted in white (like the example output [login to view URL]). My current output is shown in output_HSoble.pgm. Thanks.

## Deliverables

1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.

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## Platform

C code to be run ONLY with GCC. I just require the program to be debugged so please dont re-write - it must still run with IPLib (included).

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Project ID: #3585137

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