De-warping processing method for digital images

A de-warping processing method for digital images, used for outputting a first image in a first image window according to a partial region of a second image in a second image window, the de-warping processing method comprising:

• segmenting the first image window into a plurality of first blocks;
• segmenting the second image window into a plurality of second blocks according to an amount of the plurality of first blocks and locations of the plurality of first blocks;
• calculating a coordinate transformation parameter by a group of first vertex coordinate values of one of the plurality of first blocks and a group of second vertex coordinate values of corresponding one of the plurality of second blocks;
• repeating the step of calculating the coordinate transformation parameter by the group of first vertex coordinate values of the one of the plurality of first blocks and the group of second vertex coordinate values of the corresponding one of the plurality of second blocks until all the plurality of first blocks are processed, and then recording the coordinate transformation parameters in a lookup table;
• loading a panoramic image into the second image window, and segmenting the panoramic image into a plurality of third blocks, wherein an amount of the plurality of third blocks is the same as an amount of the plurality of second blocks;
• according to the coordinate transformation parameters in the lookup table, transforming each of coordinate values of the first blocks into an estimated coordinate value in the corresponding third block;
• and
• obtaining a pixel content value from the second image window according to each of the estimated coordinate values, and writing the pixel content value into a pixel with the corresponding coordinate value in the first image window.