matlab code sharpening a image?

please tell me the matlab code for a single image sharpening?

Answer 1

[Image Analyst]

You can use conv2() or imfilter(). For example

kernel = -1 * ones(3)/9
kernel(2,2) = 8;
kernel = kernel / sum(kernel(:)); % Normalize sum to 1.
% High frequency boost filter
sharpenedImage = conv2(double(grayImage), kernel, 'same');
imshow(sharpenedImage);

That's one way. Or you can use a Difference of Gaussians image built with two calls to imgaussfilt(), or two to fspecial and then one to imfilter (which might be faster than two imgaussfilt() calls).

[ayesha younis]

write down the code of the mat-lab for image sharpening along with flow diagram?

[Image Analyst]

I did write down the code. The flow is basically you're computing the average difference between a pixel and it's 8 neighbors - this is the Laplacian, which is the high frequencies. Then you're adding back in the original image so that you now also have the low frequencies. Result is the original image with boosted high frequencies. I'll let you draw the flow chart.