Problems with reading a 8 bit grayscale bmp file in c

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I want to read a 8 bit grayscale bmp file, reconstruct it's pixel matrix, then process it with sobel operator. However program can not construct pixel matrix, it divides the original pitcure blocks. When I run the program like that;
./sobel cube.bmp output.bmp processed.bmp output.txt

cube.bmp is the input
output.bmp is the output of constructed pixel matrix.
proccessed.bmp is the output of processed with sobel operator.
Code and Sample photos

What's the missing point ?

Posted 2-Nov-10 4:39am

Chasan KIOUTSOUK MOUSTAFA

Updated 2-Nov-10 7:14am

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CPallini 2-Nov-10 11:01am

Why are you redefining BITMAPFILEHEADER, BITMAPINFOHEADER in your code?

Chasan KIOUTSOUK MOUSTAFA 2-Nov-10 11:27am

Where am i redefining them ? I use them to get headers to structs to use the necessary values.

CPallini 2-Nov-10 15:11pm

Why don't you include 'windows.h' to get such declarations?

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E.F. Nijboer · Answer 1 · 2010-11-02T07:38:00

Have a look at these lines of your code.

C#

PIXEL **pixelArray = (PIXEL **)malloc(sizeof(PIXEL*)*(bitmapInfoHeader.biWidth*M));
PIXEL **pixelArray1 = (PIXEL **)malloc(sizeof(PIXEL*)*(bitmapInfoHeader.biWidth*M));
for(i = 0; i < (bitmapInfoHeader.biWidth*M); i++)
{
pixelArray[i] = (PIXEL *)malloc(sizeof(PIXEL)*(bitmapInfoHeader.biHeight*N));
pixelArray1[i] = (PIXEL *)malloc(sizeof(PIXEL)*(bitmapInfoHeader.biHeight*N));
}

Are you sure the height should be multiplied by the size of a pixel? Is the RGB information stored horizontal and also vertical? :confused:

Good luck!