Image coding using vector quantization with a hierarchical codebook in wavelet domain. - Wen-Shiung Chen; Fu-Chiang Ou; Li-Chien Lin; Chengho Hsin (IEEE Trans. Consumer Electron., 1999)

Color to grayscale transform preserving natural order of hues. - Chengho Hsin; Hoai-Nam Le; Shaw-Jyh Shin (ICEEI, 2011)

Color preservation for tone reproduction and image enhancement. - Chengho Hsin; Zong Wei Lee; Zheng Zhan Lee; Shaw-Jyh Shin (Color Imaging: Displaying, Processing, Hardcopy, and Applications, 2014)