چکیده (انگلیسی):

Many image display applications and printing devices allow only limited number of colours. They have
limited computational power and storage to produce high quality outputs on high bit-depth colour image. A
dithering technique is called for here in order to improve the perceptual visual quality of the limited bitdepth
images. A dithered image is represented by a natural colour in the low bit depth image colour for
displaying and printing. This technique obtains low cost colour image in displaying the colour and printing
image pixels. This study proposes the dithering technique based on Tchebichef Moment Transform (TMT)
to produce high quality image at low-bit colour. Earlier, a 2´2 Discrete Wavelet Transform (DWT) has
been proposed for better image quality on dithering. The 2´2 TMT has been chosen here since it performs
better than the 2´2 DWT. TMT provides a compact support on 2´2 blocks. The result shows that 2´2 TMT
gives perceptually better quality on colour image dithering in significantly efficient fashion.