Tchebichef Moment Transform for colour image dithering

Currently, small mobile devices may not have the capability to display high fidelity true colour images. It is expected to have limited capability in computational power and storage. However, a small mobile device is expected to perform efficiently in displaying images. A dithering technique is called for here in order to improve the perceptual visual quality of the limited bit depth images. Typically, a true colour image is reduced down to fewer bits per pixel. In order to efficiently dither a colour image on small mobile devices, this paper proposes 2×2 Tchebichef Moment Transform (TMT) approach. Earlier, a 2×2 Discrete Wavelet Transform (DWT) has been proposed for better image quality on dithering. The 2×2 TMT has been chosen since it performs better than the 2×2 DWT. TMT incorporates simplified mathematical framework technique using matrices. The result shows that 2×2 TMT gives perceptually better quality on colour image dithering in significantly efficient fashion.