A Formula Adaptive Pixel Pair Matching Steganography Algorithm

Algorithm 1

Input: A pixel pair , extraction function coefficient and secret data .

Output: Stego pixel pair .

Step 1: Set

Step 2: Set

Step 3: Set

Step 4: If then

Step 5: Set

Step 6: While to 4 do

Set

Set

If & & then

Set

Set

Else

Switch

Case 1:

Set

Case 2:

Set

Set

Case3:

Set

Case4:

Print “Error”

End Switch

End if

End While