Panoramic image stitching method for reducing geometric distortion by using an image registration process and system thereof

A panoramic image system comprising:

• a plurality of image capturing devices configured to acquire a plurality of first images;
• a memory configured to save data of a world coordinate system;
• a processor coupled to the plurality of image capturing devices and the memory and configured to process the plurality of first images;
• and
• an image output device coupled to the processor and configured to output a panoramic image;
• wherein the processor converts the plurality of first images to a plurality of second images according to the world coordinate system, identifies a plurality of feature points of each second image, partitions the second image into a plurality of sub-regions, calibrates coordinates of the plurality of feature points of the second image by using an image registration process according to the world coordinate system after the second image is partitioned into the plurality of sub-regions, generates a calibrated second image according to calibrated coordinates, and stitches a plurality of calibrated second images for generating a panoramic image accordingly;
• and
• wherein after the second image is partitioned into the plurality of sub-regions, the image registration process allocates the plurality of feature points into the plurality of sub-regions, the plurality of sub-regions have different geometric distortion degrees, the image registration process calibrates the coordinates of the plurality of feature points for recovering the plurality of sub-regions having the different geometric distortion degrees to a plurality of non-distortive sub-regions by using different transfer functions or interpolating functions corresponding to the different geometric distortion degrees.