An Improved Reversible Data Hiding Scheme by Changing Modification Direction of Partial Coefficients in JPEG Images
This work addresses data hiding efficiency for JPEG image users, but it is incremental as it builds on prior schemes.
The paper tackles the problem of distortion and file size increase in reversible data hiding for JPEG images by proposing a scheme that modifies partial nonzero AC coefficients, resulting in improved visual quality and smaller file size increases compared to state-of-the-art methods at the same embedding payload.
This paper first reviews the reversible data hiding scheme, of Liu et al. in 2018, for JPEG images. After that, a novel reversible data hiding scheme, in which modification directions of partial nonzero quantized alternating current (AC) coefficients are utilized to decrease distortion and file size increase caused by data hiding, is proposed. Experimental results have shown that the proposed scheme has indeed advantages in visual quality and smaller increase in file size of marked JPEG images while compared to the state-of-the-art scheme with the same embedding payload so far.