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Discussion Groups | Image Signal Processing | Edge Detection using sobel's mask for 8 bit bmp

Technical Discussions related to Image Processing (image coding, compression, digital effects, mpeg, etc)

  

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Edge Detection using sobel's mask for 8 bit bmp - raam baranidharan - May 25 17:35:00 2003



Hi,
I am coding a c program to perform edge detection on 8
bit bmp files using sobel's masks.The output of the
program though is pretty ordinary & i am not sure if
it is detecting edges at all.
The program works as follows-
1.I first read the bmp file & store the colour palette
in a 256 x 3 array.
2.I then multiply 3 x 3 sections of the matrix with
each of the 8 sobels masks in order & storing the
result back in the array.
3.I display the image using the changed colour palette
values.
The edges of the output image is distinct in certain
regions,but it is no where close to some of the edge
detected images i got on the image.I would like to
know if the procedure i have adopted is wrong.
Could you also suggest some other algos for edge
detection?
Thanks.
Raam

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Re: Edge Detection using sobel's mask for 8 bit bmp - bppavan - Jun 14 10:16:00 2003

Hi,
Regarding other algorithms, I think you should try Canny's edge detection
algorithm:
Canny, A. (1986).
A computational approach to edge detection.
IEEE Trans. PAMI, 8:769 - 698.

Regards,
Pavan
"=?iso-8859-1?q?raam=20baranidharan?=" wrote:

Hi,

I am coding a c program to perform edge detection on 8

bit bmp files using sobel's masks.The output of the

program though is pretty ordinary & i am not sure if

it is detecting edges at all.

The program works as follows-

1.I first read the bmp file & store the colour palette

in a 256 x 3 array.

2.I then multiply 3 x 3 sections of the matrix with

each of the 8 sobels masks in order & storing the

result back in the array.

3.I display the image using the changed colour palette

values.

The edges of the output image is distinct in certain

regions,but it is no where close to some of the edge

detected images i got on the image.I would like to

know if the procedure i have adopted is wrong.

Could you also suggest some other algos for edge

detection?

Thanks.

Raam
________________________________________________________________________

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visit http://in.tv.yahoo.com
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