基于平移旋转不变的塔式分解和模糊梯度场的医学图像配准

 为了提高医学图像配准的精度和速度,提出一种改进的圆周对称多分辨率分解算法,用环形带通滤波器代替高通滤波器,使各尺度的子带都具有平移和旋转不变性.不丢失信息的前提下,降低计算的冗余度.塔式分解的低频子带能量集中,用互信息进行配准;高频子带提供重要的解剖结构信息,构造基于边缘信息的模糊梯度场,并用模糊贴近度作为相似性测度,与互信息相结合.实验结果验证了新的金字塔算法的有效性,并且可以实现多模态医学图像的配准,结合模糊梯度场的配准算法提高了算法的鲁棒性,快速准确稳定地实现医学图像配准.

Medical Image Registration Based on Translation and Rotation-Invariant Multiresolution Decomposition and Fuzzy Gradient Field

To improve the medical image registration efficiency and accuracy,a new multiresolution analysis,improved circular symmetric multiresolution decomposition is proposed.An annular band-pass filter takes place of the high-pass filter in the circular symmetric multiresolution analysis to reduce the redundancy.All the subbands possess translation-and rotation-invariance.Low-pass subband has noise-removing property and is suitable to image registration based on mutual information.Band-pass subband has more signif...