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首页> 外文会议>ICO20: Optical Devices and Instruments >Self imaging technique for refocusing an aerospace camera
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Self imaging technique for refocusing an aerospace camera

机译：用于航空相机重新聚焦的自成像技术

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A novel auto-focusing technique using a self imaging approach is developed for an aerospace camera having large aperture and long focus. Its optical system consists of an emitting system, receiving system, and two penta-prisms . Emitting system has three parts : a light source, beamsplitter, and aim slit. The receiving system includes a field lens, two separate lenses, and CCD. Using two little penta-prisms instead of a large planar mirror makes the autofocus system simple and compact. CCD was used as photoelectric converting device. A defocused signal is acquired by measuring the change of the two slit self-images position imaged on the CCD. A simple and compact construction of the auto-focusing system was proposed. The algorithm to calculate the moving of the slit-self images position was analyzed in order to achieve subpixel position estimation. The results of the experiments show a ±10 μm focusing precision. The system demonstrates high resolution, easy adjustment and high reliability.
机译：针对具有大光圈和长焦距的航空相机，开发了一种使用自成像方法的新颖自动对焦技术。它的光学系统包括一个发射系统，一个接收系统和两个五棱镜。发射系统包括三个部分：光源，分束器和瞄准狭缝。接收系统包括一个物镜，两个单独的透镜和CCD。使用两个小的五棱镜代替大的平面镜可使自动对焦系统变得简单而紧凑。 CCD用作光电转换装置。通过测量在CCD上成像的两个狭缝自像位置的变化来获取散焦信号。提出了一种自动对焦系统的简单紧凑的结构。为了实现子像素位置估计，分析了计算狭缝自身图像位置移动的算法。实验结果表明聚焦精度为±10μm。该系统具有高分辨率，易于调整和高可靠性的特点。

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