Enhanced Reversible Data Hiding Scheme Based on DCT Coefficients in JPEG Compression

Data hiding approaches in Joint Photographic Experts Group (JPEG) compression that use discrete cosine transform (DCT) coefficients are gaining popularity due to their capacity to integrate more data into JPEG pictures while producing perceptible aesthetic deterioration. Reversible data concealing is critical for safe data transport and secrecy. This study presents a novel reversible information concealing strategy based on DCT coefficients in the overall setting of compressed JPEG data. The procedure starts with the intake of hosting pictures and the image meant for hiding. Using DCT's time domain evaluation, the host picture is examined to discover suitable spots for integrating binary data. A binary threshold is used to choose appropriate brightness ranges for DCT coefficients for smooth and undetectable data implantation. To improve the embedding process, a binary scale operation is performed on the picture intended for data concealment. This scaling not only maximizes the use of available embedding space but also reduces potential visual distortion, resulting in an overall enhancement in the scheme's resilience and profitability. In addition, equalizing the histogram is used to equalize the pixel intensities of the background and concealed pictures, increasing consistency and improving the overall optical level of the assembled image. Chaotic encryption is used throughout the procedure to certify the protection of the embedded informations. The contained binary data may be precisely recovered from the changed DCT values, enabling a complete recuperation of the original host picture as well as the hidden information. The findings show that the approach can accomplish bidirectional data hiding inside JPEG compression, with encrypted pictures visualizing the effective incorporation of hidden data. This project is powered by MATLAB software.