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1. 发明授权

US4651226A Image scanning signal generating apparatus with pre-scan for exposure control 失效
标题翻译：具有用于曝光控制的预扫描的图像扫描信号发生装置
公开(公告)号：US4651226A
公开(公告)日：1987-03-17
申请号：US661829
申请日：1984-10-17
申请人： Ryuzo Motoori , Makoto Kimura , Masaki Isogai , Akimasa Sato , Atsushi Kawahara
发明人： Ryuzo Motoori , Makoto Kimura , Masaki Isogai , Akimasa Sato , Atsushi Kawahara
IPC分类号： H04N1/40 , H04N1/407 , H04N1/10 , H04N3/04
CPC分类号： H04N1/40056 , H04N1/4072
摘要： An image signal generating apparatus includes an optical system for focusing the image of a photographic film onto a predetermined plane and a scanning device for scanning the image with a photoreceptor positioned at the predetermined plane and generating output signals representing the light intensity distribution of the film. The scanning device performs a first scan of the image and a second scan of the image upon completion of the first scan. During the first scan the levels of the output signals indicative of the maximum density and the minimum density of the film are detected, and during the second scan the exposure of the photoreceptor is controlled in accordance with the detected levels. Also, during the second scan, the output signals are clamped to a clamp level calculated in accordance with the detected maximum density level and the minimum level of the output signals during the first scan.
摘要翻译：图像信号产生装置包括用于将照相胶片的图像聚焦到预定平面上的光学系统和用于利用位于预定平面处的感光体扫描图像的扫描装置，并产生表示胶片的光强度分布的输出信号。扫描装置在完成第一次扫描时执行图像的第一次扫描和图像的第二次扫描。在第一扫描期间，检测指示膜的最大密度和最小密度的输出信号的电平，并且在第二次扫描期间，根据检测到的电平来控制感光体的曝光。此外，在第二扫描期间，输出信号被钳位到根据检测到的最大浓度水平和在第一扫描期间的输出信号的最小电平计算的钳位电平。

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