need information and source code ….
MATLAB: Implementation filter gaussian in matlab…
doit4meimage processingImage Processing Toolbox
Related Solutions
As you are using imshow I'm guessing you have the image processing toolbox installed. In that case you might as well use the imfilter() function. The function
fspecial('Gaussian', hsize, sigma )will generate a Gaussian lowpass filter.
High pass filtering can be achieved by subtracting the low pass filtered from the original image, e.g.
I = imread( 'peppers.png' ); I_filtered = I - imfilter( I, fspecial('Gaussian', 5, 1 ) ); imtool( I_filtered );If you want to do the filtering explicitly, create the convolution matrix, e.g.
hp_filter_matrix = fspecial('Gaussian', 5, 1);This gives you a 5 x 5 double matrix that you can convolve with your image to low pass filter it. As before, the high pass filtered representation can be obtained by subtraction.
A Gaussian filter blurs the image, so it can be like a "background" image. If you subtract that from the original image or one that is not blurred as much, it gives edges. This is called a Difference of Gaussian filter, or DOG filter. I've attached a demo script, below the image.
Best Answer