i need code urgently for my project, please help me

i want code for comparison of pixels in an image by considering a 3*3 matrix. for each pixel, a 3*3 matrix around the pixel should be considered and the pixel must be compared with both the diagonals of the considered 3*3 matrix, whether the pixel is greater than all the diagonal elements or not?

Answer 1

[Image Analyst]

If you're not turning it in for homework, you can use my code below which uses highly optimized 2-D convolution:

grayImage = imread('cameraman.tif');
subplot(1, 2, 1);
imshow(grayImage, []);
% Do one corner
kernel = [-1,0,0;0,1,0; 0,0,0];
filter1 = conv2(grayImage, kernel, 'same');
% Do another corner
kernel = [0,0,-1;0,1,0; 0,0,0];
filter2 = conv2(grayImage, kernel, 'same');
% Do another corner
kernel = [0,0,0;0,1,0; -1,0,0];
filter3 = conv2(grayImage, kernel, 'same');
% Do another corner
kernel = [0,0,0;0,1,0; 0,0,-1];
filter4 = conv2(grayImage, kernel, 'same');
% Output must have middle pixel greater than all 4 corners.
outputImage = (filter1 > 0) & (filter2 > 0) & (filter3 > 0) & (filter4 > 0);
subplot(1, 2, 2);
imshow(outputImage, []);

[viswanath reddy]

yes its very useful for me...