Fig. 9From: Efficient cover image selection based on spatial block analysis and DCT embeddingROC for four steganalysis techniques: the closer the ROC is to this line, the worse its stegnalyser performance. a, b CCPEVand Chen, c, d GFR and DCTR. The cover selection was performed with MSCI and random selection for different secret image sizes: (a, c): 32 × 32 and (b, d): 64 × 64Back to article page