结果表明，对同一光学产品，选取的黑体目标尺寸越大，测试结果杂光越小；

The experimental results indicate that the larger size of the black body, the smaller value of stray light;

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针对红外目标尺寸不定的实际情况，提出了对基于数学形态学的红外目标检测方法的改进。

The mathematical morphology based on improved algorithm to detect infrared targets is designed for the variable size of targets.

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在此基础上，结合探测概率制定幅度门限，根据定位要求及目标尺寸，分析了脉冲个数门限的确定方法。

Then the amplitude threshold is established combined with detection probability. The method of ascertaining pulse number threshold is analyzed according to orientation requirement and target size.

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