Phase Scrambling/Fourier transform of Images?

Question

Matthew Peoples 2021-6-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/844845-phase-scrambling-fourier-transform-of-images

回答： Subhadeep Koley 2021-6-1

Hi there - I am trying to Fourier phase scramble an image and I am stuck on getting the image to appear. Upon transforming, imshow() shows a blank image - any idea what I am doing wrong? I've included the code below. Thank you so much.

img_object_path = "Object Image was specified here"
obj_img = imread(img_object_path); 
object_fft = fft2(obj_img);
mag = abs(object_fft);
phase = angle(object_fft);
phase = -pi + (pi+pi)*rand(size(phase)); % Between -pi and pi
reconstruct_img = mag * exp(i * phase);
phase_scrambled_img = abs(ifft2(reconstruct_img));
imshow(phase_scrambled_img);

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Answer 1

Subhadeep Koley 2021-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/844845-phase-scrambling-fourier-transform-of-images#answer_714110

在 MATLAB Online 中打开

phase_scrambled_img is of type double but its range is beyond [0, 1], therefore use the below syntax so that imshow(_) can scale the display based on the range of pixel values in phase_scrambled_img.

imshow(phase_scrambled_img, []);