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    • 2. 发明授权
    • Contrast detecting apparatus for controlling an automatic focusing
operation of an imaging apparatus
    • 用于控制成像装置的自动对焦操作的对比度检测装置
    • US5369435A
    • 1994-11-29
    • US603324
    • 1990-10-25
    • Shinobu Ueda
    • Shinobu Ueda
    • G02B7/36H04N5/232
    • H04N5/23212
    • A contrast detecting apparatus includes first extracting means for extracting a signal component of a first frequency band from a luminance signal obtained by imaging a subject, second extracting means for extracting a signal component of a second frequency band lower than the first frequency band from the luminance signal obtained by imaging the subject, and determining means for determining a state of contrast of the subject in accordance with extracted outputs of the first and second extracting means. Therefore, when the contrast detecting apparatus is used, it can be exactly and automatically determined whether the contrast of the subject exists or not in accordance with a luminance signal obtained from the subject. In addition, when the contrast detecting apparatus is applied to the automatic focusing apparatus, it is possible to control the drive of lens or information supplying means to users in accordance with whether the contrast of the subject exists or not, and as a result when the subject having no contrast is imaged, the lens is stopped to be driven so that function and operability of the automatic focusing apparatus can be improved.
    • 对比度检测装置包括:第一提取装置,用于从通过对被摄体成像获得的亮度信号中提取第一频带的信号分量;第二提取装置,用于从亮度提取低于第一频带的第二频带的信号分量 以及根据第一和第二提取装置的提取的输出确定被摄体的对比度状态的确定装置。 因此,当使用对比度检测装置时,可以根据从对象获得的亮度信号,精确自动地确定被摄体的对比度是否存在。 此外,当将对比度检测装置应用于自动对焦装置时,可以根据对象的对比度是否存在来控制对用户的透镜或信息提供装置的驱动,结果当 成像不具有对比度的被摄体,透镜被停止驱动,从而能够提高自动聚焦装置的功能和可操作性。