公开(公告)号：US4772785A

公开(公告)日：1988-09-20

申请号：US125021

申请日：1987-11-24

申请人： Li-Jen Cheng ,  Hua-Kuang Liu

发明人： Li-Jen Cheng ,  Hua-Kuang Liu

IPC分类号： G02F1/03 ,  H01J3/14

CPC分类号： G02F1/0338

摘要： Apparatus is provided which greatly reduces the intensity of bright portions of an image while only moderately reducing the brightness of dimmer portions of the image, to thereby compress the range of light intensities to facilitate detection of the image. The apparatus includes a light detector device formed by a chip of photorefractive material. A two-dimensional array of light beams from an object to be detected, passes through a beam splitter to form two arrays of light beams. The two arrays of light beams are directed at different angles against a surface of the chip of photorefractive material, the two arrays of light beams forming coincident images on the surface. One of the two-dimensional arrays of beams emerging from an opposite surface of the chip has a lower range of intensities, to facilitate detection of the object despite very bright spots on its image. The other array of light beams energing from the chip has a greater range of intensities than the unprocessed image of the object.

摘要翻译： 提供了大大降低图像的亮部的强度的装置，同时仅适度地降低图像的调光部分的亮度，从而压缩光强度范围以便于图像的检测。 该装置包括由光折射材料芯片形成的光检测器装置。 来自被检测物体的光束的二维阵列通过分束器以形成两个光束阵列。 两个光束阵列相对于光折射材料芯片的表面以不同的角度被引导，两个光束阵列在表面上形成一致的图像。 从芯片的相对表面出射的二维光束阵列中的一个具有较低的强度范围，以便于尽管在其图像上存在非常亮点的物体的检测。 从芯片通电的其他光束阵列具有比未处理的对象图像更大的强度范围。