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    • 5. 发明公开
    • IMAGE TONE ADJUSTMENT USING LOCAL TONE CURVE COMPUTATION
    • 使用局部色调曲线计算的图像色调调整
    • EP3044755A1
    • 2016-07-20
    • EP14766022.9
    • 2014-08-20
    • Apple Inc.
    • LIM, Suk HwanSILVERSTEIN, D. Amnon
    • G06T5/00G06T5/40
    • H04N9/646G06T5/008G06T5/40G06T2207/10016G06T2207/20012G06T2207/20016G06T2207/20021G06T2207/20208
    • Image tone adjustment using local tone curve computation may be utilized to adjust luminance ranges for images. Image tone adjustment using local tone curve computation may reduce the overall contrast of an image, while maintaining local contrast in smaller areas, such as in images capturing brightly lit scenes where the difference in intensity between brightest and darkest areas is large. A desired brightness representation of the image may be generated including target luminance values for corresponding blocks of the image. For each block, one or more tone adjustment values may be computed, that when jointly applied to the respective histograms for the block and neighboring blocks results in the luminance values that match corresponding target values. The tone adjustment values may be determined by solving an under-constrained optimization problem such that optimization constraints are minimized. The image may then be adjusted according to the computed tone adjustment values.
    • 可以利用使用本地色调曲线计算的图像色调来调整图像的亮度范围。 使用局部色调曲线计算的图像色调调整可能会降低图像的整体对比度,同时在较小的区域保持局部对比度,例如在最明亮和最暗区域之间强度差异较大的明亮场景的图像中。 可以生成图像的期望亮度表示,包括图像的对应块的目标亮度值。 对于每个块,可以计算一个或多个色调调整值,当联合应用于块和相邻块的相应直方图时,导致匹配相应目标值的亮度值。 色调调整值可以通过求解约束不足的优化问题来确定,使得优化约束被最小化。 然后可以根据计算出的音调调整值来调整图像。