电阻阵列是一种出射式红外场景投射器, 为了改善投射图像质量, 提高半实物仿真可信度, 需要对电阻阵列的非均匀性进行实时校正。对电阻阵列结构和原理的分析表明非均匀性表现为一种固定模式的空间噪声。对辐射像元响应特性的研究发现电阻阵列的输入输出呈现非线性特性, 非均匀性的本质是辐射像元间响应特性的差异。基于先验信息对辐射像元驱动数据进行补偿, 对电阻阵列的非均匀性进行校正。对辐射像元的非线性进行预处理, 降低校正对先验测试数据的要求。采用分段线性插值实现在线校正算法, 提高校正算法的实时性。数值仿真结果表明: 该方法可将电阻阵列的非均匀性降低到 1%以下, 在 128×128和 256×256像元规模下均可保证 200 Hz的处理速度。基本满足红外成像半实物仿真对图像质量和帧频的要求。

Resistor array is a kind of emissive IR scene projector. In order to improve the quality of projected image and enhance the credibility of simulation, the non-uniformity of the resistor array need to be corrected. The structure and mechanism analysis of resistor array indicates that the non-uniformity represents a fix pattern spatial noise. Research of radiant pixels response presents a nonlinear characteristic of resistor array. The essence of non-uniformity is the difference between radiant pixels’ response. The non-uniformity was corrected by adjusting the inputs of each radiant pixel according to test data acquired previously. The nonlinearity was preprocessed to decrease the demand of test data for non-uniformity correction. Piecewise linear interpolation was applied to realize on-line non-uniformity correction algorithm and improve the real-time quality of the algorithm. Numeric simulation results indicate that the algorithm can reduce the non-uniformity to 1% below and satisfy the frame rate up to 200 Hz in 128×128 and 256×256 pixels format. The non-uniformity correction method presented can meet the demand of infrared image hardware-in-the-loop simulation for image quality and frame rate.