Comparison of LSB based and HS based reversible data hiding techniques

This paper presents a comparison of Least Significant Bit (LSB) based data hiding and a proposed Histogram Shifting (HS)-Reversible Data Hiding (RDH) based on grayscale division. In LSB substitution data hiding method the secret message is embedded in the least significant bit of the cover image. In histogram shifting data hiding the pixel value of the cover image is either incremented or decremented by one to carry one bit of secret data. Both the techniques aim at reversible data hiding where the original cover image is reconstructed without any loss or distortion after extracting the hidden data. A performance comparison of these two reversible data hiding techniques with respect to the performance metric Peak signal to noise ratio (PSNR) is presented.