Wide color gamut and high dynamic range displays using RGBW LCDs

Kwon, Kyung Joon; Kim, Min Beom; Heo, Cheon; Kim, Seong Gyun; Baek, Jong Sang; Kim, Young Hwan

doi:10.1016/j.displa.2015.05.010

Cited by 20 publications

(10 citation statements)

References 19 publications

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“…). Fifteen image‐processing experts examined contrast, brightness, colorfulness, naturalness, and overall preference . Overall, experts judged that the proposed algorithm was superior in colorfulness, naturalness, and overall preference, but that it gave similar or inferior contrast to the noise‐aware tone mapping, and similar or inferior brightness to the roll‐off algorithm (Fig.…”

Section: Resultsmentioning

confidence: 99%

Tone mapping to minimize visual sensation distortion considering brightness and local band‐limited contrast

et al. 2017

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We propose a tone-mapping algorithm that minimizes the function that represents the visual sensation distortion that occurs after tone mapping. For the function, we consider both brightness and local band-limited contrast to reduce darkening of images that have high dynamic range when they are displayed with conventional contrast-based tone mapping using histogram on devices that have low dynamic range. By exploiting human visual characteristics, we simplify the problem and find a closed-form solution that minimizes the function that represents distortion of visual sensation. In both subjective and objective evaluations, the proposed algorithm achieves a processed image that is most similar to the original image and has the best subjective image quality. 2 ; (b) Result of the algorithm. 10 FIGURE 2 -Typical tone mapping curve lines 11 : The input image is first pre-processed. The processed highdynamic-range (HDR) image is divided into a base layer (illumination) and a detail layer (reflectance) by an edge-preserving filter. The dynamic range of the base layer is compressed by the tone curve. Then the base layer and the detail layer are combined again to generate a tone-mapping image. Finally, the image is postprocessed so that it can be rendered on the display. 622 Shin et al. / Minimum visual sensation distortion tone mappingFIGURE 3 -Brightness adaptation. 12 FIGURE 4 -Simple contrast definition.

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Section: Resultsmentioning

confidence: 99%

Tone mapping to minimize visual sensation distortion considering brightness and local band‐limited contrast

et al. 2017

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“…General standard in color space [1,2,3,4] would define the chromatic coordinates of primary RGB colors and we can combine desired color temperature (CT) to get its transform matrix. D65 (x= 0.3127, y= 0.329) of color temperature is selected to run experiment in this paper.…”

Section: The Definition Of 48 Color Points In Color Standardsmentioning

confidence: 99%

P‐7.3: A methodology of color management with saturation searching and color gamut remapping

Yang¹,

Zhou²

2021

Symp Digest of Tech Papers

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Since OLED implement superior chromatic efficiency without the transmittance impact of color filter. Besides the benefit of higher brightness, excellent color saturation can perform wider factory gamut to be achieve several standard color spaces, which such as DCI‐P3[3] and adobe [2] of standard color space. For achieving AMOLED panel of display performance, this paper would like propose a methodology to utilize gamut remapping and adjustable saturation searching to pursue target chromatics coordinates in CIE‐xy. The uniform 48 color points are utilized to execute experiments to verify algorithmic performance with auto tuning software tool.

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“…Adopting the image quality circle concept proposed by Engeldrum ( 2004 ), the display primaries and the conversion algorithm can be considered as the physical parameters and technology variables (with a loosely defined distinction) that together impact the CGV as well as the perceptual image quality. RGBW displays, which utilize an extra white (W) channel for potential benefits in power consumption and observer metamerism, have been an interesting topic for considering display primaries and color conversion at the same time (Miller and Murdoch, 2009 ; Kwon et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Perceived Color Gamut in Images: From Boundary to Difference

2022

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A larger display color gamut volume (CGV) is expected to produce higher perceived brightness and colorfulness of the images displayed. However, display control algorithms such as gamut mapping and color conversion need to be carefully controlled to fully take advantage of the higher luminance and more saturated display primaries. Using RGBW displays (RGB plus a white channel) as a special case in contrast to RGB displays, it is demonstrated that a larger RGB display gamut enclosed by the boundary did not guarantee a larger color gamut perceived in images. Five gamuts with different white channel contributions were simulated, and seven different image contents were curated and rendered on each display. Using a paired comparison experiment with 33 observers, the perceived scales of color gamut as perceived brightness and colorfulness were derived. The results show more correlation with the image-wise than display-wise CGV and can be explained with image color differences. Our findings highlight the importance of considering image contents when optimizing display gamut volume, which can be guided by such image-wise analysis.

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Wide color gamut and high dynamic range displays using RGBW LCDs

Cited by 20 publications

References 19 publications

Tone mapping to minimize visual sensation distortion considering brightness and local band‐limited contrast

Tone mapping to minimize visual sensation distortion considering brightness and local band‐limited contrast

P‐7.3: A methodology of color management with saturation searching and color gamut remapping

Perceived Color Gamut in Images: From Boundary to Difference

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