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剖析了时间延迟积分CCD(TDICCD)像元校正对信噪比和调制传递函数测试的影响,设计了基于辐射标定和地面控制的多通道TDICCD像元响应非均匀性实时处理方法以提高星上实时图像的像元响应非均匀性。该方法基于辐射标定去除图像的固定图形噪声,并校正图像奇异点;通过分析星上实时传输图像,处理奇异点像元的图像问题,实现地面控制像元响应非均匀性的实时调整。提出的系统实时处理方式可以不改变硬件结构即有效改善图像的视觉效果,对于坏像元、像元性能降低、像元污染等特定情况有很强的纠错能力。实际成像试验的对比表明,该方法对信噪比、调制传递函数有很好的修正作用,其精确调整能力分别达到0.1db及0.01;在50%饱和值下测试的图像非均匀性指标达到1.25%。该方法结构简单,在工程实践中有很好的应用前景。
The influence of time delay integral CCD (TDICCD) pixel correction on signal-to-noise ratio and modulation transfer function test is analyzed. A real-time processing method for multi-channel TDICCD pixel nonuniform response based on radiation calibration and ground control is designed to improve real- The pixels of the image respond to non-uniformities. The method removes the fixed pattern noise of the image based on the radiation calibration and corrects the singularity of the image. The method realizes the real-time adjustment of the non-uniform response of the ground control pixel by analyzing the image transmitted by the star in real time and processing the image of the singular point pixel. The proposed system real-time processing method can not only improve the visual effect of the image without changing the hardware structure, but also has strong error correction ability in the special cases such as bad pixel, reduced pixel performance and pixel pollution. The comparison of the actual imaging experiments shows that this method has a good correction to the signal-to-noise ratio and the modulation transfer function with the precision adjustment capability reaching 0.1db and 0.01 respectively. The non-uniformity index of the image under test at 50% saturation reaches 1.25 %. The method is simple in structure and has good application prospect in engineering practice.