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On DCT transform

Time:05-03

How to use fopen, fread read img image [fid=fopen (' Lena. Img ', 'r');] To convert the double? Why data=https://bbs.csdn.net/topics/(fread (fid, [256256], 'uint8))'; The uint8 here cannot be changed to double? If I=im2double (data) or damage to the original image,

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