1. A stereo vision system for performing stereo matching a stereo image of right and left images captured by a stereo camera, the stereo vision system comprising: an image pre-processing unit for pre-processing the right and left images; and a stereo matching unit for acquiring low-resolution distance information of the right and left images and high-resolution distance information of the right and left images, the stereo matching unit including: an image compressor for encoding the right image to a P-frame and the left image to an I-frame image, and acquiring the low-resolution distance information using the motion vector for the P-frame; a stereo matcher for acquiring the hiqh-resolution distance information, upon detection of an object within a distance range through the low-resolution distance information; and a calibrator/controller for detecting the object within the distance range based on the motion vector, making a demand for power supply to the stereo matching unit from the power managing unit, and acquiring calibration information for the stereo camera through the motion vectors.