Enhancing Image with Histogram Matching and Median Filter

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Qvna Lhyvnav
Qvna Lhyvnav 2020-1-24
评论： Qvna Lhyvnav 2020-2-23
I want to enhance the MRI image by histogram matching and median filter, but the result is unexpected with this code:
% Grayscaled Image
A = imread ('D:\TESIS\1.jpg');
B = rgb2gray(A);
% High Pass Filtered Image
h = fspecial('log', [3 3], 0.5);
C = imfilter (B,h);
% Enhanced Image
D = imhistmatch(B,C);
E = medfilt2(D);
figure;
subplot(2,2,1), imshow(A); title('Original Image');
subplot(2,2,2), imshow(B); title('Grayscaled Image');
subplot(2,2,3), imshow(C); title('High Pass Filtered Image');
subplot(2,2,4), imshow(D); title('Enhanced Image');
My image is 1.jpg and I'm expecting the result is similar to this Test.png instead of in the code. I am wondering what is missing. Thank you.
  2 个评论
Image Analyst
Image Analyst 2020-1-24
Why don't you plot all three histograms (before, reference, and after) to see what they look like?
If you want an EXACT histogram match, see My File Exchange for code that does that much more exactly than the built-in function.
Qvna Lhyvnav
Qvna Lhyvnav 2020-2-23
Thank you for the answer before. I already added the grayscale image with the built-in function image and I got the expected result.

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KALYAN ACHARJYA
KALYAN ACHARJYA 2020-1-24
编辑：KALYAN ACHARJYA 2020-1-24
I want to enhance the MRI image by histogram matching and median filter
Histogram Matching:
Are you considering with target image?
Median filter:
A median filter use for signal smoothing, it may smooth the internal part, but I don't think it can generate the clear border view.
  1 个评论
Qvna Lhyvnav
Qvna Lhyvnav 2020-2-23
Histogram Matching:
Yes.
Median Filter:
Yes, it is but I used it after added the grayscale image with the histogram matching image and I got the expected result.

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