Title :
Low color bit-depth image enhancement by contour-region dithering
Author :
Cheng, Cheuk-Hong ; Au, Oscar C. ; Cheung, Ngai-Man ; Liu, Chun-Hung ; Yip, Ka-Yue
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
In low-end imaging systems which adopt low pixel precision, color bit-depth of an image is limited to a few bits. As a result, contouring effect tends to occur in smooth regions leading to annoying visual artifacts. Besides, the output color bit-depth is sometimes restricted in low-end systems. To enhance the visual quality in low-end imaging systems, contouring artifacts should be concealed as much as possible under the system restrictions. In this paper, a comprehensive method is proposed which combines color bit-depth expansion and dithering to enhance the image quality.
Keywords :
image enhancement; image texture; realistic images; color bit depth expansion; contour region dithering; contouring effect; image quality; low color bit depth image enhancement; Color; Computer displays; Digital images; Gold; Image enhancement; Image quality; Image storage; Liquid crystal displays; Pixel; Spatial resolution;
Conference_Titel :
Communications, Computers and Signal Processing, 2009. PacRim 2009. IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
978-1-4244-4560-8
Electronic_ISBN :
978-1-4244-4561-5
DOI :
10.1109/PACRIM.2009.5291290