Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/659795
Title: Joint Chroma Downsampling and Upsampling for Screen Content Image
Authors: Shiqi Wang;Ke Gu;Siwei Ma;Wen Gao
subject: upsampling|downsampling|screen content compression|screen content image|Chroma component
Year: 2016
Publisher: IEEE
Abstract: Screen content images are originally captured in a full-chroma format. The chroma downsampling, which is commonly applied to the chroma component in screen content image representation and processing (e.g., YUV4:2:0 compression), will significantly degrade the image quality and create annoying artifacts such as blur and color shifting. To tackle this problem, in this paper we propose luma aware chroma downsampling and upsampling algorithms to jointly improve the quality of the chroma image reconstruction. Guided by the luma information, the chroma upsampling algorithm is proposed with the utilization of major color and index map representation. The geometric information-based linear mapping is developed to transfer the structure of luma to the interpolated chroma. Subsequently, the error sensitivity of the upsampling method is analyzed, and content dependent downsampling algorithm is presented to minimize the error sensitivity function. We further explore the applicability of the proposed scheme in the scenario of screen content compression, targeting at improving the decoded chroma image quality for display. Extensive experimental results demonstrate the viability and efficiency of the proposed scheme.
URI: http://localhost/handle/Hannan/146540
http://localhost/handle/Hannan/659795
ISSN: 1051-8215
1558-2205
volume: 26
issue: 9
Appears in Collections:2016

Files in This Item:
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7172516.pdf7.17 MBAdobe PDFThumbnail
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Title: Joint Chroma Downsampling and Upsampling for Screen Content Image
Authors: Shiqi Wang;Ke Gu;Siwei Ma;Wen Gao
subject: upsampling|downsampling|screen content compression|screen content image|Chroma component
Year: 2016
Publisher: IEEE
Abstract: Screen content images are originally captured in a full-chroma format. The chroma downsampling, which is commonly applied to the chroma component in screen content image representation and processing (e.g., YUV4:2:0 compression), will significantly degrade the image quality and create annoying artifacts such as blur and color shifting. To tackle this problem, in this paper we propose luma aware chroma downsampling and upsampling algorithms to jointly improve the quality of the chroma image reconstruction. Guided by the luma information, the chroma upsampling algorithm is proposed with the utilization of major color and index map representation. The geometric information-based linear mapping is developed to transfer the structure of luma to the interpolated chroma. Subsequently, the error sensitivity of the upsampling method is analyzed, and content dependent downsampling algorithm is presented to minimize the error sensitivity function. We further explore the applicability of the proposed scheme in the scenario of screen content compression, targeting at improving the decoded chroma image quality for display. Extensive experimental results demonstrate the viability and efficiency of the proposed scheme.
URI: http://localhost/handle/Hannan/146540
http://localhost/handle/Hannan/659795
ISSN: 1051-8215
1558-2205
volume: 26
issue: 9
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7172516.pdf7.17 MBAdobe PDFThumbnail
Preview File
Title: Joint Chroma Downsampling and Upsampling for Screen Content Image
Authors: Shiqi Wang;Ke Gu;Siwei Ma;Wen Gao
subject: upsampling|downsampling|screen content compression|screen content image|Chroma component
Year: 2016
Publisher: IEEE
Abstract: Screen content images are originally captured in a full-chroma format. The chroma downsampling, which is commonly applied to the chroma component in screen content image representation and processing (e.g., YUV4:2:0 compression), will significantly degrade the image quality and create annoying artifacts such as blur and color shifting. To tackle this problem, in this paper we propose luma aware chroma downsampling and upsampling algorithms to jointly improve the quality of the chroma image reconstruction. Guided by the luma information, the chroma upsampling algorithm is proposed with the utilization of major color and index map representation. The geometric information-based linear mapping is developed to transfer the structure of luma to the interpolated chroma. Subsequently, the error sensitivity of the upsampling method is analyzed, and content dependent downsampling algorithm is presented to minimize the error sensitivity function. We further explore the applicability of the proposed scheme in the scenario of screen content compression, targeting at improving the decoded chroma image quality for display. Extensive experimental results demonstrate the viability and efficiency of the proposed scheme.
URI: http://localhost/handle/Hannan/146540
http://localhost/handle/Hannan/659795
ISSN: 1051-8215
1558-2205
volume: 26
issue: 9
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7172516.pdf7.17 MBAdobe PDFThumbnail
Preview File