The fast development of image encryption requires performance evaluation metrics. Traditional metrics like entropy do not\nconsider the correlation between local pixel and its neighborhood.These metrics cannot estimate encryption based on image pixel\ncoordinate permutation. A novel effectiveness evaluation metric is proposed in this paper to address the issue.Thecipher text image\nis transformed to bit stream. Then, Poker Test is implemented. The proposed metric considers the neighbor correlations of image\nby neighborhood selection and clip scan. The randomness of the cipher text image is tested by calculating the chi-square test value.\nExperiment results verify the efficiency of the proposed metrics.
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