Data hiding is hiding the confidential information into the digital medium like image, audio, video etc. Data hidden in these mediums cannot be determined by human visual perception. To retrieve back this confidential information and cover image used, we have to do Reversible Data Hiding (RDH). Through Reversible Data Hiding the original cover image is recovered after the message is extracted. The qualities of Reversible Data Hiding are measured by Peak Signal to Noise Ratio (PSNR), image quality, reversibility of both image and data, and data embedding capacity. Presently there are many different Reversible Data Hiding methods proposed. But the fact is that they have to compromise with any of these quality determining factors. Our proposed method improves all the quality measurements. The ultimate aim of our proposed method is to enhance the data embedding capacity and to keep the PSNR value above 48 dB. It works with peak pairs; select 2 pairs of the peak values from the histogram generated from the cover image and hide our data in the peak pairs. The data capacity of our method is enhanced by performing XOR operation. In XOR operation we create a duplicate peak pixel value, or in other terms it is limiting the gray scale values in the cover image. This embedding process is repeated number of times in order to improve the data capacity. The contrast enhancement is obtained by performing histogram equalization along with data hiding. The experiment shows the proposed method worked well in all the measures. This method is tested with normal, aerial and medical images and we obtained good result in all these different image sets.

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