航空航天相机成像性能测试系统研究

在航空航天相机的研制过程中,为了测试与评估其整机系统的成像性能,针对相机高分辨率、高量化位数和高帧频的特点,研究开发了一套基于千兆以太网的航空航天相机成像性能的测试系统。 在测试系统中应用 FPGA 完成千兆以太网协议实现图像数据的高速传输,通过上位机实时显示图像并进行图像处理与计算,经过对调制传递函数的理论分析,确定采用对比度法计算获得相机的调制传递函数(MTF)。 实验验证了图像数据实时显示的可行性与图像数据传输的正确性,同时使用 3 种不同型号的相机获取了不同分辨率 2 048×2 049、2 564×2 162、2 045×256 的测试图像的 MTF 值,通过获取 3 组数据的标准差,并与传统人工测试方法的对比分析,实验表明,该测试装置大幅提高了测试效率和测试精度,实现了整体系统成像性能的实时评价。

Development of device for imaging performance test of aerospace camera

In the aerospace camera development process, in order to test and evaluate the imaging performance of its complete system, aset of test system for the imaging performance of aerospace cameras based on Gigabit Ethernet has been developed aiming at thecharacteristics of high resolution, high quantization digits and high frame rate. In the test system, FPGA is used to complete the GigabitEthernet protocol to achieve the high-speed transmission of image data, the image is displayed in real time by the host computer. Thenimage processing and calculation are performed, after theoretical analysis of the modulation transfer function, it is determined that thecontrast method is used to calculate the modulation transfer function of the camera (MTF). The experiments have verified the feasibilityof real-time display of image data and the correctness of image data transmission, at the same time, the MTF values of test images withdifferent resolutions of 2 048× 2 049, 2 564× 2 162, and 2 045× 256 were obtained by using three different models of cameras, thestandard deviations of the three sets of data were obtained and compared with traditional manual test methods. The experiment shows thatthe test device greatly improves the test efficiency and test accuracy, it realizes the real-time evaluation of the overall system imagingperformance.