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Letter

Effective Three-Stage Demosaicking Method for RGBW CFA Images Using The Iterative Error-Compensation Based Approach

Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, Taipei 10672, Taiwan
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(14), 3908; https://doi.org/10.3390/s20143908
Received: 1 June 2020 / Revised: 6 July 2020 / Accepted: 10 July 2020 / Published: 14 July 2020
As the color filter array (CFA)2.0, the RGBW CFA pattern, in which each CFA pixel contains only one R, G, B, or W color value, provides more luminance information than the Bayer CFA pattern. Demosaicking RGBW CFA images I R G B W is necessary in order to provide high-quality RGB full-color images as the target images for human perception. In this letter, we propose a three-stage demosaicking method for I R G B W . In the first-stage, a cross shape-based color difference approach is proposed in order to interpolate the missing W color pixels in the W color plane of I R G B W . In the second stage, an iterative error compensation-based demosaicking process is proposed to improve the quality of the demosaiced RGB full-color image. In the third stage, taking the input image I R G B W as the ground truth RGBW CFA image, an I R G B W -based refinement process is proposed to refine the quality of the demosaiced image obtained by the second stage. Based on the testing RGBW images that were collected from the Kodak and IMAX datasets, the comprehensive experimental results illustrated that the proposed three-stage demosaicking method achieves substantial quality and perceptual effect improvement relative to the previous method by Hamilton and Compton and the two state-of-the-art methods, Kwan et al.’s pansharpening-based method, and Kwan and Chou’s deep learning-based method. View Full-Text
Keywords: color difference; demosaicking; demosaiced RGB full-color image; error compensation; perceptual effect; quality; RGBW color filter array (CFA) image color difference; demosaicking; demosaiced RGB full-color image; error compensation; perceptual effect; quality; RGBW color filter array (CFA) image
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MDPI and ACS Style

Chung, K.-L.; Chan, T.-H.; Chen, S.-N. Effective Three-Stage Demosaicking Method for RGBW CFA Images Using The Iterative Error-Compensation Based Approach. Sensors 2020, 20, 3908. https://doi.org/10.3390/s20143908

AMA Style

Chung K-L, Chan T-H, Chen S-N. Effective Three-Stage Demosaicking Method for RGBW CFA Images Using The Iterative Error-Compensation Based Approach. Sensors. 2020; 20(14):3908. https://doi.org/10.3390/s20143908

Chicago/Turabian Style

Chung, Kuo-Liang, Tzu-Hsien Chan, and Szu-Ni Chen. 2020. "Effective Three-Stage Demosaicking Method for RGBW CFA Images Using The Iterative Error-Compensation Based Approach" Sensors 20, no. 14: 3908. https://doi.org/10.3390/s20143908

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