High Capacity Data Embedding using Colour Palette Decomposition

K.B. Raja, S. Siddaraju, K.R. Venugopal, and L.M. Patnaik (India)


Steganography, Colour palette, payload encryption, error control code.


There are two major issues to hide information: (i) to protect intellectual property rights i.e., to enforce copyright laws. The use of digital watermark provides a way to insert a copyright notice into a document or image. The watermark is small data repeated frequently throughout the document or image. (ii) To convey information in a covert manner to avoid observations by unintended recipients. Steganography is the embedding of secret message in the cover image for covert communication. In this paper, we present a High Capacity Data Embedding using Colour Palette Decomposition (CPD) in which the payload is embedded into the cover image as an index of shifted centroids to derive the stego image. The error control coding is applied to stego image to increase PSNR, capacity and security. It is observed that our algorithm has higher PSNR and capacity in comparison to earlier works. Some of the Steganographic techniques are: (i) Least Significant Bit (LSB) embedding (ii) Mapping method (iii) Frequency Domain Embedding (iv) Spread spectrum and (v) Colour Palette Technique. LSB embedding: It is one of the earliest data-embedding method. In this LSB of a cover image is replaced by the payload. LSB technique is a simple, nonrobust embedding technique with a high embedding capacity with small bounded embedding distortion Mapping method: In this method the pixels of the cover image is altered based on some mathematical function selected at the transmitter which has to be known by the receiver to retrieve the hidden data in the image pixels [1]. This method has small capacity compared to other technique

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