5.2. Overview of Block Truncation Coding–Based Information Hiding
In the 2000s, several watermarking and data hiding schemes for BTC-compressed gray-level images have been proposed. We overview them in two categories, i.e., watermarking schemes and lossless information hiding schemes.
5.2.1. Overview of Block Truncation Coding–Based Image Watermarking
The first watermarking method  based on BTC was proposed by Lu et al. in 2002, where the robust watermark is embedded by modifying the vector quantization (VQ)-BTC encoding process according to the watermark bits. In 2004, Lin and Chang  proposed a data hiding scheme for BTC-compressed images by performing least significant bit (LSB) substitution operations on BTC high and low means and performing ...