Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint
Recently, the white (w) channel has been incorporated in various forms into color filter arrays (CFAs). The advantage of using theWchannel is thatWpixels have less noise than red (R), green (G), or blue (B) (RGB) pixels; therefore, under low-light conditions, pixels with high fidelity can be obtaine...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-08-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/20/16/4458 |
| _version_ | 1797559218978422784 |
|---|---|
| author | Hansol Kim Sukho Lee Moon Gi Kang |
| author_facet | Hansol Kim Sukho Lee Moon Gi Kang |
| author_sort | Hansol Kim |
| collection | DOAJ |
| description | Recently, the white (w) channel has been incorporated in various forms into color filter arrays (CFAs). The advantage of using theWchannel is thatWpixels have less noise than red (R), green (G), or blue (B) (RGB) pixels; therefore, under low-light conditions, pixels with high fidelity can be obtained. However, RGBW CFAs normally suffer from spatial resolution degradation due to a smaller number of color pixels than in RGB CFAs. Therefore, even though the reconstructed colors have higher sensitivity, which results in larger Color Peak Signal-to-Noise Ratio (CPSNR) values, there are some color aliasing artifacts due to a low resolution. In this paper, we propose a rank minimization-based color interpolation method with a colorization constraint for the RGBW format with a large number ofWpixels. The rank minimization can achieve a broad interpolation and preserve the structure in the image, and it thereby eliminates the color artifacts. However, the colors fade from this global process. Therefore, we further incorporate a colorization constraint into the rank minimization process for the better reproduction of the colors. The experimental results show that the images can be reconstructed well, even from noisy pattern images obtained under low-light conditions. |
| first_indexed | 2024-03-10T17:42:17Z |
| format | Article |
| id | doaj.art-f4a4dff18716454a9149c05238104d06 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T17:42:17Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-f4a4dff18716454a9149c05238104d062023-11-20T09:40:04ZengMDPI AGSensors1424-82202020-08-012016445810.3390/s20164458Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization ConstraintHansol Kim0Sukho Lee1Moon Gi Kang2School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, KoreaDivision of Computer Engineering, Dongseo University, Busan 47011, KoreaSchool of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, KoreaRecently, the white (w) channel has been incorporated in various forms into color filter arrays (CFAs). The advantage of using theWchannel is thatWpixels have less noise than red (R), green (G), or blue (B) (RGB) pixels; therefore, under low-light conditions, pixels with high fidelity can be obtained. However, RGBW CFAs normally suffer from spatial resolution degradation due to a smaller number of color pixels than in RGB CFAs. Therefore, even though the reconstructed colors have higher sensitivity, which results in larger Color Peak Signal-to-Noise Ratio (CPSNR) values, there are some color aliasing artifacts due to a low resolution. In this paper, we propose a rank minimization-based color interpolation method with a colorization constraint for the RGBW format with a large number ofWpixels. The rank minimization can achieve a broad interpolation and preserve the structure in the image, and it thereby eliminates the color artifacts. However, the colors fade from this global process. Therefore, we further incorporate a colorization constraint into the rank minimization process for the better reproduction of the colors. The experimental results show that the images can be reconstructed well, even from noisy pattern images obtained under low-light conditions.https://www.mdpi.com/1424-8220/20/16/4458RGB-Whitecolor filter arraycolor interpolationrank minimizationlow light condition |
| spellingShingle | Hansol Kim Sukho Lee Moon Gi Kang Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint Sensors RGB-White color filter array color interpolation rank minimization low light condition |
| title | Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint |
| title_full | Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint |
| title_fullStr | Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint |
| title_full_unstemmed | Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint |
| title_short | Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint |
| title_sort | demosaicing of rgbw color filter array based on rank minimization with colorization constraint |
| topic | RGB-White color filter array color interpolation rank minimization low light condition |
| url | https://www.mdpi.com/1424-8220/20/16/4458 |
| work_keys_str_mv | AT hansolkim demosaicingofrgbwcolorfilterarraybasedonrankminimizationwithcolorizationconstraint AT sukholee demosaicingofrgbwcolorfilterarraybasedonrankminimizationwithcolorizationconstraint AT moongikang demosaicingofrgbwcolorfilterarraybasedonrankminimizationwithcolorizationconstraint |