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    • 6. 发明授权
    • Quantization error compensation apparatus and method thereof
    • 量化误差补偿装置及其方法
    • US07203375B2
    • 2007-04-10
    • US10614793
    • 2003-07-09
    • Yung-jun ParkJae-hwan Oh
    • Yung-jun ParkJae-hwan Oh
    • G06K9/36G06K9/38G06K9/46G06K9/40G06K9/32G06K15/00H04N7/12H04N11/02H04N11/04H04N1/40G06T5/00H04B1/66G06K9/48G06K9/60
    • G06T5/40G06T5/009
    • A quantization error compensation includes a dividing unit to divide an input current image signal into a first high-frequency signal and a low-frequency signal; a changing unit to replace bits of the first high-frequency signal with a predetermined signal to output a second high-frequency signal; an adding unit to add the low-frequency signal and the second high-frequency signal to create a composite signal; a quantization unit to cut n number of bits of the composite signal and to output the cut composite signal and the n number of bit signal; an equalizing unit to output a brightness equalizing value of the cut composite signal; a calculating unit to calculate a compensation value using the n number of the bit signal and a difference between brightness equalizing values with respect to a current and next brightness levels; and a compensation unit to add the compensation and the current brightness equalizing values.
    • 量化误差补偿包括将输入的当前图像信号分割为第一高频信号和低频信号的分割单元; 改变单元,用预定信号替换第一高频信号的位,以输出第二高频信号; 添加单元,用于添加低频信号和第二高频信号以产生复合信号; 量化单元,用于切断复合信号的n个比特,并输出切割复合信号和n个比特信号; 均衡单元,输出所切割的复合信号的亮度均衡值; 计算单元,使用n个位信号来计算补偿值,并且相对于当前亮度和下一个亮度级别计算亮度均衡值之间的差; 以及补偿单元来补偿补偿和当前亮度均衡值。
    • 9. 发明授权
    • Contrast compensation apparatus and method thereof
    • 对比度补偿装置及其方法
    • US07359573B2
    • 2008-04-15
    • US10699658
    • 2003-11-04
    • Yung-jun ParkJae-hwan OhHyun KangSeung-joon Yang
    • Yung-jun ParkJae-hwan OhHyun KangSeung-joon Yang
    • G06K9/40G06K9/00G09G5/00
    • G06T5/009G06T5/40
    • A contrast compensation apparatus and a method thereof utilize a simplified hardware structure and a low contrast distortion. The contrast compensation apparatus includes a pixel value detection unit to detect a distribution of pixel values of respective pixels of an input image signal, a pixel value limit unit having pre-set luminance limit values and re-configuring the distribution of the pixel values of the respective pixels based on the pre-set luminance limit values, and a mapping unit to set luminance for the respective pixels based on a cumulative distribution function with respect to the re-configured pixel values. When certain portions of an image are rendered very bright or dark, the phenomenon in which the entire image becomes abruptly bright or dark is reduced. Further, the contrast compensation apparatus uses the minimum number of multipliers, adders, and subtractors only, thus having an advantage of simplified structure and using less electric power.
    • 对比度补偿装置及其方法利用简化的硬件结构和低对比度失真。 对比度补偿装置包括:像素值检测单元,用于检测输入图像信号的各个像素的像素值的分布,具有预设亮度极限值的像素值限制单元,以及重新配置像素值的像素值的分布; 基于预设亮度极限值的各个像素,以及基于相对于重新配置的像素值的累积分布函数来设置各个像素的亮度的映射单元。 当图像的某些部分变得非常亮或暗时,整个图像变得突然亮或暗的现象减少。 此外,对比度补偿装置仅使用最小数量的乘法器,加法器和减法器,因此具有简化结构和使用较少电功率的优点。