Data-Hiding Scheme Using Multidirectional Pixel-Value Differencing on Colour Images

Algorithm 1

Embedding algorithm.

	The embedding algorithm of PVM scheme is as follows.
	Step 1: Separate RGB colour image into R, G, and B channels
	Step 2: Convert decimal secret data to generate ternary secret data
	Step 3: Perform modulus 3 operation on the all pixel values of the R, G, and B grayscale images to generate
	Step 4: Convert the cover image pixel value to the stego image pixel value according to the following conditions. Case 1:  = , then not modified Case 2:  ≠  and  < , then  =   + 1 Case 3:  ≠  and  > , then  =   – 1
	Step 5: Merge R, G, and B to generate a stego image.