id: 05845945
dt: j
an: 05845945
au: Wu, Jing; Du, Xin; Gu, Weikang
ti: A block classification-based compression method for computer screen image.
so: J. Zhejiang Univ., Eng. Sci. 43, No. 4, 682-687 (2009).
py: 2009
pu: Zhejiang University Press, Hangzhou
la: ZH
cc: 
ut: block classification; palette coding; hybrid coding
ci: 
li: doi:10.3785/j.issn.1008-973X.2009.04.015
ab: Summary: A block-based compression method for computer screen image is
    proposed to realize real-time computer screen image transmission. Each
    block of image is classified into three categories: text/graphic block,
    hybrid block and picture block according to the different characters on
    color and texture. Text/graphic block is compressed with a lossless
    coding algorithm integrating palette coding, Hextile coding and LZW
    algorithm. Picture block is compressed with lossy JPEG. Both lossless
    and lossy methods are used on hybrid block. Experimental results show
    that the method can exactly distinguish the information between the
    text/graphics and the picture. The peak signal-to-noise ratio (PSNR) of
    the reconstructed image is improved by 1$\sim$4dB compared with other
    methods. The method achieves good compression ratio with low
    computation, which satisfies the real-time requirement.
rv: