Description: P0301: digital image matrix data display and Fourier transform
P0302: image compression of two-dimensional discrete cosine transform
P0303: use grayscale transform to enhance contrast of image
P0304: histogram homogenization
P0305: simulated images are influenced by gaussian white noise and pretz-salt noise
P0306: using the two-dimensional median filter function, medfilt2 is used to filter the image of the pretzed-salt noise
P0307: use the function filter2 of MATLAB to mean filtering the image with noise interference
P0308: the image's adaptive wiener filtering
P0309: sharpen the image with 5 different gradient enhancement methods
P0310: image's high-pass filtering and mask processing
P0311: using Butterworth's low-pass filter to smooth out the noise affected images
P0312: sharpen the image through the Butterworth high-pass filter
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