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公开(公告)号：US5345262A
公开(公告)日：1994-09-06
申请号：US923195
申请日：1992-07-31
摘要： A color video projection system (10) in which images of three separate colors (22,24,26) are separately projected to converge on a common region of the screen (20) is provided with automatic convergence control to ensure that three images are precisely superimposed upon each other. A test pattern of a number of pattern units (36,38) of an intensity (42,44,48) that varies over each unit in a similar manner is imaged on a two dimensional matrix array of charged coupled devices (CCD) (32). The test pattern is projected in sequence by each of the three CRT projectors (50,54,58,14,16,18) of the system, and during the projection of the test pattern, the position of the centroid (40) of each unit of the test pattern is determined from the light intensity pattern received by the CCD matrix array, and stored (112). The centroid positions of each unit of a test pattern of two of the projectors are compared with positions of the centroids of each unit of the test pattern projected by a third one of projectors. The comparison develops an error signal for each unit of each test pattern, enabling convergence correction signals to be fed to convergence control deflections coils (120,122,124) of each of the cathode ray tubes (50,54,58) so as to effectively shift each of two of the images to superposition with the third.
摘要翻译： 提供了分别投影以会聚在屏幕（20）的公共区域上的三种分开的颜色（22,24,26）的图像的彩色视频投影系统（10）具有自动会聚控制，以确保三个图像是精确的 彼此叠加。 以类似的方式在每个单元上变化的强度（42,44,48）的多个图案单元（36,38）的测试图案被成像在电荷耦合器件（CCD）（32）的二维矩阵阵列上 ）。 测试图案按照系统的三个CRT投影仪（50,54,58,14,16,18）中的每一个按顺序投影，并且在测试图案的投影期间，每个的重心（40）的位置 由CCD矩阵阵列接收的光强图案确定测试图案的单位，并存储（112）。 将两台投影机的测试图案的每个单元的重心位置与由第三台投影机投影的测试图案的每个单元的质心位置进行比较。 比较产生每个测试图案的每个单元的误差信号，使得能够将会聚校正信号馈送到每个阴极射线管（50,54,58）的收敛控制偏转线圈（120,122,124），以便有效地将每个 两个图像与第三个图像叠加。
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