There is a close correlation between the three channels of a color image. The existing edge preserving super-resolution method for grayscale image can not be extended directly to RGB space, because it is easy to break the relevance and cause color artifacts. A new method of color image super resolution based on alpha channel is proposed to solve this problem. Firstly, the image is segmented by region, and the foreground, background and alpha channel of each region are extracted. Then, the alpha channel, foreground and background images are super-resoluted respectively. Finally, the high resolution image is synthesized again. The alpha channel is used to coordinate the edge information of three channels. The experimental results show that the method can keep the color edge of the image better and has better visual effects.
ZHAO Hong
,
WEI Yonggang
,
YANG Gang
. A color image super resolution approach based on alpha channel[J]. Journal of Hebei University(Natural Science Edition), 2018
, 38(3)
: 321
-326
.
DOI: 10.3969/j.issn.1000-1565.2018.03.014
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