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    • 1. 发明授权
    • Method of and apparatus for positioning photographic originals in a
copying station
    • 在复印台中定位照相原稿的方法和装置
    • US4947205A
    • 1990-08-07
    • US415065
    • 1989-09-29
    • Gerhard BenkerWilhelm NitschBernd PayrhammerVolker WeinertHelmut TreiberUlrich Klueter
    • Gerhard BenkerWilhelm NitschBernd PayrhammerVolker WeinertHelmut TreiberUlrich Klueter
    • G03B27/46G03B27/53G03B27/62
    • G03B27/6285
    • A filmstrip containing a series of images is conveyed along a path which passes by a copying station and a scanning station. The filmstrip is advanced in steps using transporting rolls and a narrow segment of the filmstrip is scanned at the scanning station after every step. A first set of measurements obtained upon scanning of the filmstrip is used to calculate the amounts of light and the exposure times required to properly reproduce the images. A second set of measurements is used to detect characteristic regions of the filmstrip having abrupt changes in density. The positions of the characteristic regions along the filmstrip are established by a counter which counts the steps undergone by the filmstrip and the measurement or measurements corresponding to each characteristic region are stored together with the respective position. The positions of the characteristic regions and the second set of measurements are used to calculate the positions of the images along the filmstrip. After the filmstrip has been completely scanned, the filmstrip is conveyed along the path once more. During the second trip along the path, the filmstrip is scanned again while the distance traveled by the filmstrip is measured by the counter. Upon detection of a characteristic region, the position of such region along the filmstrip as measured by the counter during the second trip is compared with the stored position obtained during the first trip. If the positions are different, the counter is changed to match the stored position. This compensates for slip between the filmstrip and the transporting rolls thereby allowing the images to be accurately positioned in the copying station for reproduction as the filmstrip travels along the path for the second time.
    • 包含一系列图像的胶卷沿着通过复印台和扫描台的路径传送。 胶卷使用传送辊步骤前进,并且在每一步之后在扫描台上扫描胶卷的窄段。 使用在扫描胶片时获得的第一组测量来计算适当再现图像所需的光量和曝光时间。 使用第二组测量来检测具有突然的密度变化的胶片的特征区域。 沿着胶片的特征区域的位置由计数器确定,该计数器对由胶片进行的步骤进行计数,并且与每个特征区域对应的测量或测量与各自的位置一起存储。 使用特征区域和第二组测量的位置来计算沿着幻灯片的图像的位置。 在胶片完全被扫描之后,胶片沿路径再传送一次。 在沿路径的第二次行程中,再次扫描胶片,同时通过计数器测量胶卷的距离。 在检测到特征区域时,将在第二次跳闸期间由计数器测量的沿着胶片的这种区域的位置与在第一次行程期间获得的存储位置进行比较。 如果位置不同,则更改计数器以匹配存储的位置。 这补偿了胶片和传送辊之间的滑移,从而允许图像准确地定位在复印台中以便再现,因为胶片沿着路径第二次行进。