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    • 91. 发明授权
    • Image processing apparatus and method, and recording medium therefor
    • 图像处理装置和方法及其记录介质
    • US06781595B2
    • 2004-08-24
    • US10035711
    • 2001-10-22
    • Seiji KobayashiTomoo MitsunagaHiroaki OnoKen NakajimaChikako SanoNobuyuki Sato
    • Seiji KobayashiTomoo MitsunagaHiroaki OnoKen NakajimaChikako SanoNobuyuki Sato
    • G09G502
    • H04N1/6005G06T5/009G06T5/40G06T5/50G06T2207/10024G06T2207/20208H04N1/6027H04N9/045H04N9/77
    • An image processing apparatus and method and a recording medium therefor control the occurrence of a change in a hue. The histogram of a luminance signal Y is generated in a first step S1. In a second step S2, the histograms of the luminance signals Y are accumulated to generate a cumulative histogram, and the cumulative histogram is subjected to logarithmic approximation thereby to generate a lookup table (LUT) for correcting luminance signals. In a third step S3, a color-difference signal correction parameter LUT is generated by referring to the LUT for correcting luminance signals. In a fourth step S4, an input luminance signal Y is applied to the LUT for correcting luminance signals thereby to acquire a corrected luminance signal Y0. In a fifth step S5, the input luminance signal Y is applied to a color-difference signal correction parameter LUT so as to acquire a correction parameter k. In a sixth step S6, input color-difference signals Cr and Cb are multiplied by the correction parameter k to acquire corrected color-difference signals Cr0 and Cb0.
    • 一种图像处理装置和方法及其记录介质,用于控制色相变化的发生。 在第一步骤S1中生成亮度信号Y的直方图。 在第二步骤S2中,累积亮度信号Y的直方图以生成累积直方图,并对累积直方图进行对数近似,从而生成用于校正亮度信号的查找表(LUT)。 在第三步骤S3中,通过参考用于校正亮度信号的LUT来生成色差信号校正参数LUT。 在第四步骤S4中,输入亮度信号Y被施加到用于校正亮度信号的LUT,从而获得校正的亮度信号Y0。 在第五步骤S5中,将输入亮度信号Y施加到色差信号校正参数LUT,以获得校正参数k。 在第六步骤S6中,输入色差信号Cr和Cb与校正参数k相乘以获得校正色差信号Cr0和Cb0。