It is classes to scramble or shuffle image data with integer key. It can be used for simple encryption.
It includes four types of classes: imShuffleRand, imShuffleRandBlock, imScrambleRand, and imScrambleRandBlock.
In generally, imScrambles are better than imShuffle.
Masayuki Tanaka, Learnable Image Encryption, IEEE International Conference on Consumer Electronics TAIWAN (ICCE-TW), 2018.
Bug fixed and adding functionality of nb_bits.
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