Enhancing Image with Histogram Matching and Median Filter
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Qvna Lhyvnav
on 24 Jan 2020
Commented: Qvna Lhyvnav
on 23 Feb 2020
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
and I'm expecting the result is similar to this
instead of in the code. I am wondering what is missing. Thank you.
![1.jpg](https://www.mathworks.com/matlabcentral/answers/uploaded_files/268045/1.jpeg)
![Test.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/268046/Test.png)
2 Comments
Image Analyst
on 24 Jan 2020
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.
Accepted Answer
KALYAN ACHARJYA
on 24 Jan 2020
Edited: KALYAN ACHARJYA
on 24 Jan 2020
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.
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