Rotation error correcting method of CT (Computerized Tomography) scanned images

The invention relates to a rotation error correcting method of CT (Computerized Tomography) scanned images. The rotation error correcting method comprises the following steps of: selecting two CT scanned images on the same scanned position at different displacement moments; selecting a proper threshold value, carrying out binaryzation onto the images, selecting specific rock matrixes in the images as reference substances in a subsequent correcting method; converting the obtained binary images into polar coordinate images from rectangular coordinate images; counting coordinates of the pixel occupied by each rock matrix in the polar coordinate images and calculating mass center coordinates of the rock matrix; comparing translation amount of the same rock matrix mass center in the polar coordinate images at different displacement moments, reversely calculating the relative rotary angles of the two initial CT scanned images; and rotating the initial CT scanned images. The rotation error correcting method of the C