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

Algorithm 1

	Step 1. Divide n adjacent pixels into two groups and , where .
	Step 2. Transform s into decimal by formula
	Step 3. Construct the Algorithm 1, where , are integers and .
	Step 4. Bring into Algorithm 1 and obtain
	Where
	Step 5. Calculate the difference D between into by Algorithm 1.
	Step 6. is obtained by embedding into in the following steps.
	if
	if
	,
	if
	transform to , for each i in do
	, if
	if
	transform to , for each i in
	, if
	Step 7. Bring into Algorithm 1 to calculate and get the difference D between and by . Finally, repeat step 6 to obtain .
	Step 8. Merge and to get .
	Step 9. Repeat from steps 20 to 27 until all secret data are embedded.