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盲元是影响非制冷红外焦平面阵列(IRFPA)成像质量的因素之一。在对非制冷红外焦平面阵列中盲元的响应特性分析的基础上,提出一种基于双阈值快速迭代盲元检测算法。该算法基于双参考辐射源,采集辐射源两个不同温度下的成像图像,当非制冷IRFPA器件工作在线性区时,正常像元的灰度响应会随外界温度而发生变化,且该变化呈近似线性关系;此时,盲元的灰度响应几乎不随着温度的变化而改变,表现为某一固定灰度值,因此,可利用非制冷IRFPA响应的这种线性特征来检测出过热像元和死像元。实验结果验证了该算法的有效性,为非制冷IRFPA的盲元补偿提供了基础。
Blind element is one of the factors affecting the imaging quality of uncooled infrared focal plane array (IRFPA). Based on the analysis of response characteristics of blind elements in uncooled infrared focal plane arrays, a fast blind iteration algorithm based on double threshold is proposed. Based on the dual reference radiation source, the algorithm collects the image of two radiation sources at different temperatures. When the uncooled IRFPA device operates in the linear region, the gray response of the normal pixel changes with the outside temperature, and the change is The linear response of the non-cooled IRFPA response can be used to detect overheated pixels And dead pixels. Experimental results verify the effectiveness of the proposed algorithm and provide a basis for blind compensation of uncooled IRFPA.