Complete Double Layered Embedding Scheme for Information Hiding

Double-Layered Embedding was proposed by exploiting the least significant bit replacement on gray pixels which are not specified by wet paper codes. DLE adds one to or subtracts one from pixel value when the secret bit to be embedded is not matched the least significant bit of that pixel. However, DLE requires extra space like location map to indicate if the pixel has been changed by adding and subtracting 1. Though the location map gives a hand to correctly recovery the secret message into its original appearance, it is an overhead. Without the requirements of location map for secret message extracting, we propose an improved scheme called Complete Double-Layered Embedding to provide higher capacity compared to DLE scheme does and maintain good image quality.