How do I sharpen/refocus an image using only the fspecial and conv2 commands?

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mahnoor ahsan
mahnoor ahsan 2015-4-14
回答： Image Analyst 2015-4-14
We are studying simple convolution in my class. So far we have convolved 2 signals and reduced noise from sine waves. Now we've an assignment to refocus an image.
This is my code so far:
x=imread('Sgrayblur.png');
h=
y=conv2(x,h);
subplot(1,2,1),imshow(x);
subplot(1,2,2),imshow(y);
What must I put after 'h='? Is it possible to use fspecial to sharpen without using imfilter or the like?

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回答（1 个）

Image Analyst
Image Analyst 2015-4-14
You can use a Laplacian to get a high pass filter, then add it to the original image to sharpen the edges. Of course because convolution is a linear filter, you can simply add the kernels together and do a convolution once. So a 3 by 3 filter for a high boost filter would be:
kernel = [-1, -1, -1; -1, 17, -1; -1, -1, -1]/ 9;
sharpenedImage = conv2(double(grayImage), kernel, 'same');
You can use imfilter() instead of conv2() if you want.

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