1. A Computerized Tomography (CT) device based on motion compensation, comprising: a CT scanning device adapted to perform CT scanning on a scanned object; a stereo vision measurement system adapted to measure a motion parameter of the scanned object in synchronization with the scanning of the CT scanning device, wherein the stereo vision measurement system comprises a first camera and a second camera adapted to collect a 2D/3D image of the scanned object in synchronizations with the scanning of the CT scanning device, and wherein the synchronizations of the first and second cameras with the CT scanning device are based on collection timing of a detector in the CT scanning device; and an imaging device adapted to compensate for the motion of the scanned object during the CT scanning by performing a transformation on a reconstructed image matrix based on the motion parameter, wherein the imaging device is further configured to before a back-projection of projection data collected at different time moments, perform a matrix transformation on reconstructed images of a scanned object with correspondence between the measured motions and the time moments when the motions occur so as to make the images keep consistent with the object's patterns at each time moment; perform a back-projection for the current set of image matrix; after back-projection at the current moment, transform the current image matrix into the object's pattern corresponding to a next moment; perform a back projection on a next set of projection data, until all projection data have been subjected to back projection; and transform the current image matrix into a pattern at initial moment; wherein a period of a synchronous collection pulse trigger signal is adjusted to an integer multiple of a detector collection period, as collection triggers for the first and second cameras, when a detector collection rate used in the CT scanning device is higher than collection rates of the first and second cameras.