针对机器视觉在某些应用场合对摄像机内外参数的需要,提出了一种基于内嵌正交权值矩阵神经网络的摄像机标定方法.首先,使设计的神经网络的权值分别与摄像机的外参数和内参数相对应,即使得所设计的神经网络与摄像机的物理模型一致.正交权值矩阵的生成在迭代中相当于遗传算法的上一次变异,系统的性能指标为由网络输出组成的矢量与对应特征点投影于图像平面的齐次坐标差值2-范数的平方.同时引进混合遗传-模拟退火算法,使得系统在达到平衡状态时可根据神经网络的权值完成摄像机内外参数的标定.实验结果表明,该方法具有较好的鲁棒性,且标定精度高,算法简洁,是摄像机内外参数标定的有效解决方案.%According to the intrinsic and extrinsic parameters of a camera to be needed in some applications for machine vision, a method based on the neural network with embedded orthogonal weight matrix is proposed for camera calibration. Firstly, the neural network with the embedded orthogonal weight matrix is structured, whose weights are corresponding to the camera extrinsic parameters and intrinsic parameters. Thus, the structured neural network coincides with the model of camera. The generation of orthogonal weight matrix is served as the last mutation operator in the iteration of genetic algorithm, and the performance index is the square of 2-norm of the difference between vector con-sisting of network's outputs and homogeneous coordinate of corresponding feature point projected in image plane. Meanwhile, a hybrid genetic-simulation annealing algorithm is introduced into the sol-ving-programming. When the system comes to the equilibrium, the intrinsic and extrinsic parameters of the camera can be obtained in the light of network's weights. The simulated experiments illustrate that the proposed algorithm is robust, and has the advantages of high calibration precision, simplicity and clarity according to real experiments. It provides an effective solution scheme for camera calibration of intrinsic and extrinsic parameters.
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