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    • 8. 发明授权
    • Automatic analysis and adjustment of digital images with exposure problems
    • 自动分析和调整数字图像曝光问题
    • US07359572B2
    • 2008-04-15
    • US10400593
    • 2003-03-26
    • Min LiuPo YuanRichard S. Turner, Jr.
    • Min LiuPo YuanRichard S. Turner, Jr.
    • G06K9/40G06K9/00G09G5/02
    • G06T5/40G06T5/009G06T2207/20008
    • Techniques and tools for analyzing and adjusting the exposure of digital images are described. For example, a computer processes a digital image by analyzing exposure data, assigning an image classification (e.g., StretchNeeded, UnderExposed, OverExposed, or Normal) based on the analysis, and selecting an exposure compensation technique (e.g., histogram stretch, positive gamma curve, negative gamma curve, or no adjustment) based on the image classification. The exposure data can be luminance values for pixels in the digital image represented in a histogram. The computer can produce transform data comprising a transformation of the exposure data according to the selected exposure compensation technique. The computer can store transform data in a look-up table and can store the look-up table in the digital image file. The described techniques and tools can be implemented as a feature of an operating system environment and can be activated responsive to user action via a user interface.
    • 描述了分析和调整数字图像曝光的技术和工具。 例如,计算机通过分析曝光数据,基于分析分配图像分类(例如,StretchNeeded,UnderExposed,OverExposed或Normal)来处理数字图像,并且选择曝光补偿技术(例如,直方图拉伸,正伽玛曲线 ,负伽马曲线或无调整)。 曝光数据可以是在直方图中表示的数字图像中的像素的亮度值。 计算机可以产生包括根据所选择的曝光补偿技术的曝光数据变换的变换数据。 计算机可以将变换数据存储在查找表中,并且可以将查找表存储在数字图像文件中。 所描述的技术和工具可以被实现为操作系统环境的特征,并且可以通过用户界面响应于用户动作来激活。