基于自适应T型和菱形搜索算法的CT图像的MAP重建

MAP Reconstruction for CT Images based on Adaptive-T and Diamond Search Method

图像的超分辨率重建就是从一个低分辨率序列中重建出一幅高分辨率的图像。而运动估计则直接影响超分辨率重建的效果。我们提出一种基于物体边缘的自适应运动估计方法,对物体的边缘部分采用菱形搜索的方法,保证运动估计的精确度。对物体内部和背景部分采用自适应T型搜索和菱形搜索相结合的方法,保证运动估计的快速性。将这种运动估计的结果应用到最大后验概率(MAP)重建的过程中,可以保证图像重建算法的可靠性。通过对CT投影数据的分析并进行MAP重建,可以获得良好的高分辨率图像。

The purpose of Super-Resolution(SR) image reconstruction is that a high-resolution image is reconstructed from low-resolution sequence images.Motion estimation affects the result of reconstruction.An adaptive motion-estimation method based on the object′s edge was introduced.Diamondsearch(DS) was used for object′s edge,and adaptive-T-search(AT) combined with DS for the other of object.So this method could guarantee accuracy and efficiency of the estimation.The result of motion estimation was applied to the ...