High-Capacity Data Hiding Method Based on Two Subgroup Pixels-Value Adjustment Using Encoding Function

Algorithm 2

Embedding example of MPA.

	Input 4 adjacent pixels and nk+2 = 14 binary secret data s.
	Output 4 stego-pixels .
	Step 1. Divide 4 adjacent pixels into two groups and .
	Step 2. Transform s into decimal .
	Step 3. Construct the to get and .
	Step 4. Bring and into Equation 2 to calculate , .
	Step 5. Calculate by Algorithm 1.
	Step 6. is obtained by embedding into in the following steps.
	,
	transform to , ,
	for , , , ,
	for , ,
	get .
	Step 7. Bring into Algorithm 1 to calculate and get the difference D between and by .
	,
	transform to , ,
	for , , ,
	for , ,
	get .
	Step 8. Merge and to get .