针对激光主动成像图像的特点, 分析了Canny边缘检测算子存在的不足。应用小波多尺度分解算法对激光主动成像强度图像进行小波变换, 应用Bayes Shrink自适应阈值法对小波系数进行滤波, 把滤波后的图像按照Canny三条检测标准进行边缘检测, 并给出衡量图像边缘检测效果的指标。通过比对各种实际激光主动图像的边缘检测算法的结果可以看出本文的算法达到了很好的效果。

An analysis is given to the shortcomings of Canny operator according to image characteristics of laser active imaging. A method is proposed for using wavelet multi-scale decomposition to realize wavelet transform for laser radar intensity images. The Bayes Shrink self-adaptive threshold method is employed for wavelet coefficients filtering and edge detection is implemented to the filtered image according to three Canny detection criterion. The indicators for judging the effect of image edge detection are given. Analysis to various results of edge detection algorithms of practical laser active imaging show that the proposed algorithm has fine effectiveness.