APSIPA Transactions on Signal and Information Processing > Vol 9 > Issue 1

Color-gamut mapping in the non-uniform CIE-1931 space with perceptual hue fidelity constraints for SMPTE ST.2094-40 standard

Industrial Technology Advances

Chang Su, Samsung Research America (SRA), USA, changsu.01@samsung.com , Li Tao, Samsung Research America (SRA), USA, Yeong Taeg Kim, Samsung Research America (SRA), USA
 
Suggested Citation
Chang Su, Li Tao and Yeong Taeg Kim (2020), "Color-gamut mapping in the non-uniform CIE-1931 space with perceptual hue fidelity constraints for SMPTE ST.2094-40 standard", APSIPA Transactions on Signal and Information Processing: Vol. 9: No. 1, e12. http://dx.doi.org/10.1017/ATSIP.2020.11

Publication Date: 31 Mar 2020
© 2020 Chang Su, Li Tao and Yeong Taeg Kim
 
Subjects
 
Keywords
High-dynamic range (HDR)Wide-color gamut (WCG)Color gamut mappingGamut compressionUltra-high definition television (UHDTV)Image processingColor quality maintenance
 

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In this article:
I. INTRODUCTION 
II. OVERVIEW 
III. THE OFF-LINE PROCESSING 
IV. THE IN-LINE PROCESSING 
V. EXPERIMENTAL RESULTS 
V. CONCLUSION 

Abstract

As high-dynamic range (HDR) and wide-color gamut (WCG) contents become more and more popular in multimedia markets, color mapping of the distributed contents to different rendering devices plays a pivotal role in HDR distribution eco-systems. The widely used and economic gamut-clipping (GC)-based techniques perform poorly in mapping WCG contents to narrow gamut devices; and high-performance color-appearance model (CAM)-based techniques are computationally expensive to commercial applications. In this paper, we propose a novel color gamut mapping (CGM) algorithm to solve the problem. By introducing a color transition/protection zone (TPZ) and a set of perceptual hue fidelity constraints into the CIE-1931 space, the proposed algorithm directly carries out CGM in the perceptually non-uniform space, thus greatly decreases the computational complexity. The proposed TPZ effectively achieves a reasonable compromise between saturation preserving and details protection in out-of-gamut colors. The proposed hue fidelity constraints reference the measurements of human subjects' visual responses, thus effectively preserve the perceptual hue of the original colors. Experimental results show that the proposed algorithm clearly outperforms the GC-CGM, and performs similarly or better than the expensive CAM-CGM. The proposed algorithm is real-time and hardware friendly. It is an important supplement of the SMPTE ST.2094-40 standard.

DOI:10.1017/ATSIP.2020.11