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    • 9. 发明授权
    • Image sensing apparatus which performs dynamic range expansion and image
sensing method for dynamic range expansion
    • 用于动态范围扩展的动态范围扩展和图像感测方法的图像感测装置
    • US5929908A
    • 1999-07-27
    • US594265
    • 1996-01-30
    • Kenji TakahashiYoshiro UdagawaMasato IkedaEiichiro Ikeda
    • Kenji TakahashiYoshiro UdagawaMasato IkedaEiichiro Ikeda
    • H04N5/235H04N7/36H04N5/238
    • H04N5/235H04N19/503
    • An image sensing apparatus which senses an object a plurality of times in different exposures to obtain a plurality of images and makes a single image with a widened dynamic range by processing the plurality of sensed images, generates a histogram of signal levels of an image sensed in a proper exposure by using a histogram generator, automatically decides whether a dynamic range expansion processing is to be processed or not on the basis of the generated histogram by using a dynamic range expansion deciding unit, determines a parameter for sensing another image of the object in an exposure which is different from the proper exposure in accordance with a decision by the dynamic range expansion deciding unit by using a parameter determination unit, and obtains a single image of the object by processing the image sensed in the proper exposure and the image sensed by using the parameter determined by said parameter determination unit an image processing unit. When an image sensing apparatus is not equipped with a photometer, a pre-sensing operation is performed, an image sensed in the pre-sensing operation is analyzed to find a proper exposure, and this image is also used in the dynamic range expansion processing. A part or whole image data of a plurality of images which are obtained as above and necessary for the dynamic range expansion processing are compressed by a compressing unit and the compressed image data is used in the dynamic range expansion processing.
    • 一种图像感测装置,其通过处理多个感测图像在不同的曝光中多次感测对象以获得多个图像并使具有加宽的动态范围的单个图像生成图像感测的图像的信号电平的直方图 通过使用直方图发生器的适当曝光,通过使用动态范围展开判定单元,基于所生成的直方图,自动判定是否要处理动态范围扩展处理,确定用于感测对象的另一图像的参数 通过使用参数确定单元,根据动态范围展开判定单元的判定与正确的曝光不同的曝光,并且通过处理在适当的曝光中感测到的图像和通过适当曝光感测到的图像来获得对象的单个图像 使用由所述参数确定单元确定的参数来确定图像处理单元。 当图像感测装置未配备光度计时,执行预感测操作,分析在预感测操作中感测到的图像以找到适当的曝光,并且该图像也用于动态范围扩展处理。 通过压缩单元压缩如上所述并且对于动态范围扩展处理所必需的多个图像的部分或全部图像数据,并且在动态范围扩展处理中使用压缩图像数据。