Image calibration system and image calibration method for calibrating image capturing device

An image calibration system, comprising:

• an image capturing device, including at least one camera module;
• a calibration unit, configured to be photographed by the image capturing device;
• a mount plate, wherein the image capturing device is configured to be mounted on the mount plate, and the mount plate is configured to be moved or rotated to adjust a direction of a line of sight of the at least one camera module;
• a display device, wherein the display device is configured to display currently accumulated images captured by the at least one camera module;
• and
• a processor, coupled to the image capturing device and the display device,
• wherein for the at least one camera module, the processor is configured to:
• control the at least one camera module to capture an image of the calibration unit, which is taken as a first image of the calibration unit, wherein the mount plate is in a first position when the at least one camera module captures the first image of the calibration unit;
• determine whether there is any other part of the calibration unit not captured yet based on images already captured by the at least one camera module;
• and
• in response to determining that there is at least a part of the calibration unit not shown in the captured images, control the at least one camera module to capture another image of the calibration unit, which is taken as a second image of the calibration unit, wherein the mount plate is in a second position different from the first position when the at least one camera module captures the second image of the calibration unit;
• wherein the processor is further configured to calculate image calibration parameters based on a sufficient number of qualified images captured by the at least one camera module, wherein the image calibration parameters are used for calibrating image distortion.