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Optical Engineering

Color transient improvement for signals with a bandlimited chrominance component
Author(s): Joonyoung Chang; Gun Shik Shin; Jong Hyun Park; Moon Gi Kang
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Paper Abstract

In color television broadcasting standards, such as National Television System Committee (NTSC) and phase alteration line (PAL), the bandwidth of the chrominance signals are even narrower than those of the luminance signals. Also in digital video standards, the chrominance signals are usually low-pass filtered and subsampled to reduce the amount of data. Because of these reasons, the chrominance signals have poor transition characteristics and the slow transition causes blurred color edges. A color transient improvement algorithm is proposed by exploiting the high-frequency information of the luminance signal. The high-frequency component extracted from the luminance signal is modified by adaptive gains and added to the low-resolution chrominance signals in the proposed algorithm. The gain is estimated to minimize the l2 norm of the error between the original and the estimated pixel values in a local window. The proposed algorithm naturally improves the transient of the chrominance signal as much as that of the luminance signal without overshoots and undershoots. The experimental results show that the proposed method produces steep and natural color edge transition and reconstructs narrow line edges that are not restored by the conventional algorithms.

Paper Details

Date Published: 1 February 2007
PDF: 11 pages
Opt. Eng. 46(2) 027002 doi: 10.1117/1.2709633
Published in: Optical Engineering Volume 46, Issue 2
Show Author Affiliations
Joonyoung Chang, Yonsei Univ. (South Korea)
Gun Shik Shin, Yonsei Univ. (South Korea)
Jong Hyun Park, Yonsei Univ. (South Korea)
Moon Gi Kang, Yonsei Univ. (South Korea)

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