High pass filter in MATLAB

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Yvonne 2012-7-23

Hi,

I understand that high pass filter is essentially, orignal image - low pass filter.

I attempted the following but gotten a black screen. Anyone knows what when wrong? Thanks lots!

--CODE-

A=imread('image.jpg');
G=fspecial('gaussian', [50 50], 5); 
Ig=imfilter(A,G,'same'); 
JK=A-Ig; 
S=imshow(JK) >>> the output here is black image.

Christian Lenz 2012-7-23

normalize image...

 A = double( imread('image.jpg'));
 A = A./max(max(max(A)));

keep the rest.

Christian Lenz 2012-7-23

Or play with your parameters (thresholding)

Yvonne 2012-7-24

Thanks! I need to do mat2gray as well =)

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