公开(公告)号：US4001594A

公开(公告)日：1977-01-04

申请号：US588984

申请日：1975-06-20

申请人： Taizo Akimoto ,  Takaaki Terasita ,  Shigeru Watanabe

发明人： Taizo Akimoto ,  Takaaki Terasita ,  Shigeru Watanabe

IPC分类号： G03B27/72 ,  G03B27/80 ,  G01N21/30

CPC分类号： G03B27/72 ,  G03B27/80

摘要： An improved method for controlling the quantity of exposure in photographic printing to obtain high-quality prints is disclosed. The method is carried out by photoelectrically detecting a plurality of optical densities from a principal portion of a negative film then discriminating the maximum value and the minimum value of the photoelectrically detected optical densities. The difference between the maximum and minimum values is calculated to achieve a first output, and the first output is non-linearly converted and combined with the maximum or minimum value output to achieve a third output for controlling the quantity of exposure. The method provides satisfactory prints even from those negative films having principal subject density failures or color failures.

公开(公告)号：US4339185A

公开(公告)日：1982-07-13

申请号：US218562

申请日：1980-12-22

申请人： Kenji Nakauchi ,  Takaaki Terasita

发明人： Kenji Nakauchi ,  Takaaki Terasita

IPC分类号： G03B7/099 ,  G03B7/28 ,  G03G15/04 ,  H04N5/235 ,  G03B7/08

CPC分类号： G03B7/28 ,  G03B7/09979

摘要： In a camera or a printer, exposure is controlled based on a selected mode of light measuring means which has a number of different modes of weighting for differently weighting various parts of an image in light measurement. In the light measuring means, there are provided a number of image information operating means which have different ways of weighting various parts of an image. The weighting mode is properly selected according to the kind of the scene of the image. The light measuring means comprises a number of photodetectors arranged in the form of arrays and a number of operating means for weighting the outputs of the photodetectors in different ways.

摘要翻译： 在相机或打印机中，基于所选择的光测量装置的模式来控制曝光，所述光测量装置具有多个不同的加权模式，用于在光测量中不同地加权图像的各个部分。 在光测量装置中，提供了多个图像信息操作装置，其具有加权图像的各个部分的不同方式。 加权模式根据图像场景的种类进行适当选择。 光测量装置包括以阵列的形式布置的多个光电检测器和用于以不同方式加权光电检测器的输出的多个操作装置。

公开(公告)号：US4244653A

公开(公告)日：1981-01-13

申请号：US908450

申请日：1978-05-22

申请人： Eiichi Asai ,  Fumio Matsumoto ,  Takaaki Terasita

发明人： Eiichi Asai ,  Fumio Matsumoto ,  Takaaki Terasita

IPC分类号： G03B27/73 ,  G01J3/46 ,  G03B27/78

CPC分类号： G03B27/73

摘要： Red, green and blue densities of a color negative are measured at a plurality of points thereon. The measured densities are normalized by a normalizing circuit so that the same levels of density signals can be obtained regardless of the gamma value and sensitivity of the negatives when the same subject matter is photographed under the same conditions. The normalized density signals are plotted in a chromaticity coordinate system and examined as to whether or not they fall within a given region defining a particular color in the chromaticity coordinate system. When the level of the normalized signals with respect to a given point falls within the given region, the point is determined to have the particular color defined by the region in the chromaticity coordinate system. When the color negative includes a predetermined number of points of the particular color, the exposure in a color printer is controlled to reproduce the particular color in a desirable condition.

摘要翻译： 在其上的多个点处测量颜色为负的红色，绿色和蓝色密度。 测量的密度通过归一化电路进行归一化，使得当在相同条件下拍摄相同的主题时，无论伽马值和底片的灵敏度如何，都可以获得相同水平的密度信号。 将归一化密度信号绘制在色度坐标系中，并检查它们是否落入在色度坐标系中定义特定颜色的给定区域内。 当相对于给定点的归一化信号的电平落在给定区域内时，该点被确定为具有由色度坐标系中的区域限定的特定颜色。 当颜色否定包含特定颜色的预定数量的点时，控制彩色打印机中的曝光以在期望的条件下再现特定颜色。

公开(公告)号：US4395099A

公开(公告)日：1983-07-26

申请号：US260410

申请日：1981-05-04

申请人： Takaaki Terasita

发明人： Takaaki Terasita

IPC分类号： G01J1/44 ,  G03B7/091 ,  G03B7/097 ,  G03B7/099

CPC分类号： G03B7/091

摘要： A number of light receiving elements are used for measuring the brightness Bi of a number of parts of the scene and the maximum brightness Bmax and the minimum brightness Bmin are detected among the measured brightness values. Then, the scene brightness B is calculated by use of a formula: ##EQU1## Based on the scene brightness thus obtained, the aperture or shutter is controlled to obtain appropriate exposure. In case where the weighting coefficients for the number of light receiving elements are made equal to each other, the average brightness Bmean throughout the whole image is used.

摘要翻译： 多个光接收元件用于测量场景的多个部分的亮度Bi，并且在测量的亮度值中检测最大亮度Bmax和最小亮度Bmin。 然后，通过使用以下公式计算场景亮度B：