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Title: Low-complexity color demosaicing algorithm based on integrated gradients
Authors: Chung, KH
Chan, YH 
Keywords: Cameras
Edge detection
Image colour analysis
Image reconstruction
Mosaic structure
Issue Date: Apr-2010
Publisher: SPIE and IS&T
Source: Journal of electronic imaging, Apr.-June 2010, v. 19, no. 2, 021104, p. 1-15 How to cite?
Journal: Journal of electronic imaging 
Abstract: Color demosaicing is critical for digital cameras, because it converts a Bayer sensor mosaic output to a full color image, which determines the output image quality of the camera. In this work, an efficient decision-based demosaicing method is presented. This method exploits a new edge-sensing measure called integrated gradient (IG) to effectively extract gradient information in both color intensity and color difference domains simultaneously. This measure is reliable and supports full resolution, which allows one to interpolate the missing samples along an appropriate direction and hence directly improves the demosaicing performance. By sharing it in different demosaicing stages to guide the interpolation of various color planes, it guarantees the consistency of the interpolation direction in different color channels and saves the effort required to repeatedly extract gradient information from intermediate interpolation results at different stages. An IG-based green plane enhancement is also proposed to further improve the method’s efficiency. Simulation results confirm that the proposed demosaicing method outperforms up-to-date demosaicing methods in terms of output quality at a complexity of around 80 arithmetic operations per pixel.
ISSN: 1017-9909
DOI: 10.1117/1.3432484
Rights: Copyright 2010 Society of Photo-Optical Instrumentation Engineers and IS&T. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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