激光照射器立靶测试中靶板识别方法

Target Recognition Method for Laser Director Target Measurement

在激光照射器立靶测试系统中,针对外场环境背景复杂、对比度低等情况,导致动态靶板难以精确识别,提出一种基于小波变换的多尺度模板匹配识别动态靶板方法,采用小波变换和多尺度理论相结合的多层次搜索匹配策略,首先在图像分辨率最低层次进行粗匹配,剔除大量非匹配点,保留对应准匹配点;然后沿图像分辨率增大方向在准匹配点进行逐层局部匹配,直到匹配结束,精确识别出靶板的四个角特征目标区域,精确定位靶板角特征目标点。实验表明,该方法对动态靶板中心的测量精度达到0.4pixel,对激光照射器照射精度测试的研究有重要意义。

In the laser director target measurement system,the complex environments and low contrast result in recog-nizing dynamic target difficultly, a multi-scale template matching dynamic target recognition method based on wavelet transform was proposed. Using multi-level search and match strategy which combined multi-scale theory and wavelet transform, firstly, matching roughly in the lowest level of image resolution, excluding a large number of non-matching points and reserving quasi match points;Then matching partly layer by layer at the quasi match points along the image resolution larger,until the end of matching,recognizing precisely four corner characteristics area of the target,and posi-tioning precisely the corner characteristics points. Experiment show that the measurement accuracy by this method for the center of dynamic target can be achieved 0.4pixel,and it is import for research on laser director irradiation accuracy.