From: High-capacity reversible image steganography based on pixel value ordering
PVO | IPVO | PVOMM | |
---|---|---|---|
Similarities | |||
Pixel values need to be sorted in the processing unit. | |||
Secret information embedded by expanding the prediction error. | |||
Extra information has to be considered (handle the overflow/underflow problem). | |||
High image quality preserved after embedding secret information. | |||
“Fixed block” method used. | |||
Differences | |||
Peak points | “1” or “− 1” | “0” and “1” (or “− 1”) | “1” or “− 1” |