please any one help me .. how to apply 3*3 matched filter to image.. image is having size 465*800..and matched filter value is all 1's.
MATLAB: 3*3 matched filter
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You need an outer double loop over rows and columns of the larger matrix, then inside that you need another double loop to go over the elements of your filter at a fixed location of the larger matrix. See attached code where I do a convolution "manually" with 4 for loops instead of using the conv2() function.
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 cornerkernel = [0,0,0;0,1,0; -1,0,0];filter3 = conv2(grayImage, kernel, 'same');% Do another cornerkernel = [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, []);
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