基于红外图像的被动测距方法

根据红外成像导引头截取时序红外图像的特点，提出了一种跟踪红外运动图像序列中目标的稳定特征点，利用成像所得特征部分尺寸得到距离信息的被动测距方法。基于红外图像特征点难以提取的特点，在分析典型飞机红外图像的基础上，采用局部自适应插值算法提高图像分辨率，并对飞机图像及尾焰进行双阈值分割。跟踪过程中选择机头部位作为特征点的提取部位，通过分析导引头投影成像模型得到弹目距离估计量，并根据跟踪成像特点对估计结果做了进一步修正。实验结果证明了该方法的可行性和有效性。

Passive ranging method based on infrared images

In accordance with the characteristics of image sequence obtained by the imaging seeker of air-to-air missile, a passive ranging algorithm based on infrared image sequence is proposed. According to the characteristics of the target image, a locally-adaptive interpolation is used to improve resolution. And the target is segmented from its rail-spout. The nose-cone of aircraft is selected as the special component during the tracking. Analyzing the model of perspective projection for image seeker, the target distance is evaluated. Finally, an adaptive correction method is presented to increase the precision. The experimental results show that the algorithm is effective.