基于混合特征的拓扑结构射影不变量

摘要

To improve the precision and stability of the calculation of geometric feature topology projective invariants based on image information ,an improved algorithm based on point features was proposed .A homogeneous algorithm based on hybrid fea‐tures model was presented to get topology projective invariants by combining line features and point features ,and any two points of a straight line were introduced into invariants equation using multi‐pixel characteristics of line features .The anti‐jamming ability was then enhanced and the matching error rates were reduced .Matrix method was applied and invariants function was built using the solvability and existence constraints of invariants .The results of old and new algorithms were analyzed through Matlab simulation and the high precision and stability were verified by the topology projective invariants based on the hybrid fea‐tures algorithm .%为提高图像信息中几何特征拓扑结构射影不变量计算的准确度和精度，在点特征拓扑信息提取算法的基础上进行改进。将直线特征与点特征结合，引入基于混合特征模型的齐次算法，获得拓扑结构的射影不变量，利用直线特征多像素点的特性，将构成直线的任意两点引入不变量方程中，增强计算的抗干扰能力，降低匹配错误率，运用矩阵运算方法以及不变量的可解性约束和存在性约束构造不变量函数。通过M atlab仿真对新旧算法得出的结果进行分析，验证了由混合特征算法获得的拓扑结构射影不变量的高精度性和高稳定性。