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对红外焦平面阵列而言,欠采样产生的混淆效应严重影响成像质量。基于红外焦平面阵列的成像过程,在时间域分析了探测器的采样过程,在频率域定量研究了混淆效应对图像的影响,根据混淆产生的机理,分别对周期目标和非周期目标进行仿真实验。实验结果表明:对周期目标会有混淆失真现象,改变了图形的几何形状,对于非周期图像会产生锯齿条纹。指出在低空间频率内混淆影响小,噪声对图像的影响占主导地位,而在高空间频率内混淆失真严重,噪声影响小,这对消除图像混淆的影响、系统参数设计等方面具有一定的参考价值。
For infrared focal plane arrays, the obfuscation effect of under-sampling severely affects the imaging quality. Based on the imaging process of the infrared focal plane array, the sampling process of the detector is analyzed in the time domain and the influence of the aliasing effect on the image is quantitatively studied in the frequency domain. According to the mechanism of the confusion, the periodic target and the non-periodic target are simulated respectively . The experimental results show that there will be confusion distortion to the cycle target, changing the geometric shape of the image and generating jagged stripes for the non-periodic image. It is pointed out that the influence of confusion in low spatial frequency is small and the influence of noise on image is dominant. However, the distortion in the high spatial frequency is serious and the influence of noise is small, which has some reference to eliminate the influence of image confusion and system parameter design value.