旋转不变振幅位相合成圆谐滤波器

Rotation Invariant Amplitude Phase Composite Circular Harmonic Filter

提出了振幅位相合成圆谐滤波器用于旋转不变模式识别。该滤波器的振幅是圆谐滤波器的振幅谱加偏移量后的逆函数，位相是圆谐滤波器的位相谱。计算机模拟实验证明，与传统的圆谐滤波器和纯位相圆谐滤波器相比，振幅位相合成圆谐滤波器具有更好的识别能力。

The rotation invariant amplitude phase composite circular harmonic filter (CHF) is proposed. It gives an amplitude spectrum as the inverse of a biased amplitude spectrum of the CHF, and a phase spectrum as the phase spectrum of the CHF. Computer simulation results show that the proposed filter yields a sharper correlation peak, higher signal to noise ration and better correlation discrimination compared with the CHF and the phase only CHF.