Visual Secret Sharing Scheme for JPEG Compressed Images
K. Arunkumar, B. Karthik, B. Senthil Kumaran · 2012
Existing schemes modify either the pixel values or change the Color Index Table (CIT) values. Almost all the existing techniques are applicable to primarily non-compressed images in either monochrome or color domains. However, most imaging applications including digital photography, archiving and internet communications nowadays use images in the JPEG compressed format. Application of the existing Visual Secret Sharing schemes for these images requires conversion back into spatial domain. In this paper we propose a shared key algorithm that works directly in the JPEG domain, thus enabling shared key image encryption for a variety of applications. The scheme directly works on the quantized DCT coefficients and the resulting noise- like shares are also stored in the JPEG format. The decryption process is lossless preserving the original JPEG data.