Obtaining Higher Rates for Steganographic Schemes while Maintaining the Same Detectability
This paper focuses on modifying the decoder module for an active steganographic scheme to increase the effective data-rate with- out affecting the embedding module. Three techniques are suggested to improve the error correction framework, an essential component of an active steganographic scheme. The rst involves puncturing where the code-length is increased by adding a suitable number of additional era- sures. The second technique involves channel modeling and soft-decision decoding which is adaptive to the individual embeddable image coeficient. The third method adjusts the erasure threshold depending on the design hiding quantizer so as to achieve a higher data-rate. Combin- ing these techniques, the effective data-rate is increased by 10%-50% for Yet Another Steganographic Scheme (YASS), a popular active stegano- graphic scheme.
Node ID: 552 , DB ID: 361 , Lab: VRL , Target: Workshop