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Correlation coefficient of pepper image (512 × 512); (a–c) The correlation coefficient of plain pepper image for three directions of a = Horizontal (H-D), b = Diagonal (D-D) and, c = Vertical (V-D). (d–f) The correlation coefficient of encrypted pepper image for three directions of d = Horizontal (H-D), e = Diagonal (D-D) and f = Vertical (V-D).
