A Data Hiding Technique to Synchronously Embed Physiological Signals in H.264/AVC Encoded Video for Medicine Healthcare

Algorithm 3

Algorithm of our data hiding decoding technique.

Algorithm: Extract a sample.

Input: Embedded sample in a synchronous frame.

Result: Data of the sample in bit-pairs according to (2).

(1) for ExtractSample do

(2) curblock → current macroblock

(3) for MacroblockPartition do

(4)   switch Mapping do

(5)    case (%2 = 1) & (%2 = 0): Bit-pair = 00

(6)    case (%2 = 0) & (%2 = a): Bit-pair = 01

(7)    case (%2 = 1) & (%2 = 1): Bit-pair = 10

(8)    case (%2 = 0) & (%2 = 0): Bit-pair = 11

(9)   end switch

(10)  end for → until complete all partitions of the current macroblock

(11) end for → until complete all samples