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Table 4 Embedding distortion in terms of PSNR (dB) before and after clustering.

From: Progressive Exponential Clustering-Based Steganography

 
Image Embedding image using unexpanded colour table Embedding image usingexpanded colour table Embedding image using unexpanded colour table Embedding image using expanded colour table
Hill 38.22 38.82 35.69 35.37
Mandrill 38.27 38.21 35.16 35.14