A steganographic method based upon JPEG and quantization table modification
Information Sciences—Informatics and Computer Science: An International Journal - Special issue: Intelligent multimedia computing and networking
IHW '01 Proceedings of the 4th International Workshop on Information Hiding
Invertible Authentication Watermark for JPEG Images
ITCC '01 Proceedings of the International Conference on Information Technology: Coding and Computing
Reversible hiding in DCT-based compressed images
Information Sciences: an International Journal
JPEG Steganography: A Performance Evaluation of Quantization Tables
AINA '09 Proceedings of the 2009 International Conference on Advanced Information Networking and Applications
Data embedding in JPEG bitstream by code mapping
IEEE Transactions on Image Processing
Lossless data hiding in JPEG bitstream
Journal of Systems and Software
Reversible data hiding for JPEG images based on histogram pairs
ICIAR'07 Proceedings of the 4th international conference on Image Analysis and Recognition
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In this paper, a lossless data hiding scheme which directly embeds data into the bitstream of JPEG images is presented. For real cases, the JPEG code space is partly occupied, not all variable length codes (VLC) in the Huffman table are used during the JPEG image compression process. Thus, these unused VLCs can be made used of and data hiding can be performed by mapping one or more unused VLCs to one used VLC. Through analyzing the statistics of both used and unused VLCs, the proposed scheme can take full advantage of the unused VLCs by mapping Huffman codes according to a specific mapping strategy and reach higher capacity. The output stego image can keep exactly the same content as the original one and preserve the same file size, and if the file size is allowed to be enlarged, then our scheme can achieve a significant improvement of embedding capacity.