用Matlab实现的后向投影算法，一个经典的投影算法，常用语CT断层成像中-After using Matlab implementation of the algorithm to the projection, the projection of a classical algorithm, commonly used terms in CT tomography

matlab数字图像识别，识别CT 扫描电镜照片 然后导入PFC中进行识别颗粒和孔隙(Matlab digital image recognition, recognition of CT scanning electron micrographs and then introduction into PFC for identification of particles and pores)