image enhancement by modified Gaussian high-pass filter
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Dear Gen. I need your kind support in my issue, in my project i have to use a symmetrical modified Gaussian high-pass filter for image enhancement as in below two image,
the image in top is the gray input image and the image down is the filtered image.
the symmetrical modified Gaussian high-pass filter used the formula :
H(x,y)=a*(1-e^(-(distance^2)/(2*d^2)))+b
where : distance=sqrt((x-p)^2+(y-q)^2) , a=12.5 , b=-4 and d=12.
but when i coding the above formula and test it with a gray image there is no any change between the input and output image.
my code as below:
[m, n]=size(grayimage);
f_transform=fft2(croppedImage);
f_shift=fftshift(f_transform);
p=m/2;
q=n/2;
d0=12;
for i=1:m
for j=1:n
distance=sqrt((i-p)^2+(j-q)^2);
x(i,j)=12.5*(1-exp(-(distance^2)/(2*(d0^2))))-4 ;
end
end
filter_apply=f_shift.*x;
image_orignal=ifftshift(filter_apply);
image_filter_apply=abs(ifft2(image_orignal));
figure(5)
imshow(image_filter_apply,[])
please any kind support
Kind Regards
2 件のコメント
Image Analyst
2016 年 3 月 1 日
Exactly what is the question? Is there anything wrong with your code? Tell me first so I don't have to run it. Also, attach the original image, not a screenshot.
回答 (1 件)
amal abbbes
2018 年 4 月 10 日
i have the same problem with you if you find a solution please help me
0 件のコメント
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