Preferred color correction for digital LCD TVs

Kyoung Tae Kim; Choon-Woo Kim; Ji-Young Ahn; Dong-Woo Kang; Hyun-Ho Shin

doi:10.1117/12.806085

19 January 2009 Preferred color correction for digital LCD TVs

Kyoung Tae Kim, Choon-Woo Kim, Ji-Young Ahn, Dong-Woo Kang, Hyun-Ho Shin

Proceedings Volume 7241, Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications; 72410A (2009) https://doi.org/10.1117/12.806085
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States

Abstract

Instead of colorimetirc color reproduction, preferred color correction is applied for digital TVs to improve subjective image quality. First step of the preferred color correction is to survey the preferred color coordinates of memory colors. This can be achieved by the off-line human visual tests. Next step is to extract pixels of memory colors representing skin, grass and sky. For the detected pixels, colors are shifted towards the desired coordinates identified in advance. This correction process may result in undesirable contours on the boundaries between the corrected and un-corrected areas. For digital TV applications, the process of extraction and correction should be applied in every frame of the moving images. This paper presents a preferred color correction method in LCH color space. Values of chroma and hue are corrected independently. Undesirable contours on the boundaries of correction are minimized. The proposed method change the coordinates of memory color pixels towards the target color coordinates. Amount of correction is determined based on the averaged coordinate of the extracted pixels. The proposed method maintains the relative color difference within memory color areas. Performance of the proposed method is evaluated using the paired comparison. Results of experiments indicate that the proposed method can reproduce perceptually pleasing images to viewers.

Citation Download Citation

Kyoung Tae Kim, Choon-Woo Kim, Ji-Young Ahn, Dong-Woo Kang, and Hyun-Ho Shin "Preferred color correction for digital LCD TVs", Proc. SPIE 7241, Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications, 72410A (19 January 2009); https://doi.org/10.1117/12.806085

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KEYWORDS

Skin

Visualization

Image quality

Target detection

Televisions

Color difference

LCDs

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