Method and system for image distortion correction using quarter and tangential lookup tables

An image processing system configured to generate a corrected image from a distorted image, the image processing system comprising:

• an image memory storing a distorted image and configured to store a corrected image;
• a lookup table memory storing a quarter LUT (QLUT), an x-axis tangential distortion LUT (TxLUT), and a y-axis tangential distortion LUT (TyLUT);
• an image processing circuit, coupled to the image memory and the lookup table memory, and configured to
• select a portion of the corrected image to populate,
• determine a quadrant of the corrected image in which the selected portion resides,
• generate a portion of a LUT corresponding to the selected portion of the corrected image using the QLUT, TxLUT, TyLUT, and the determined quadrant, wherein the generated LUT correlates pixels in the selected portion of the corrected image with one or more pixels of the distorted image,
• populate the selected portion of the corrected image with pixels selected from the distorted image using the generated portion of the LUT, and
• select a next portion of the corrected image to populate when the corrected image is not fully populated.

A method for generating a quarter lookup table (QLUT) from an original lookup table (original LUT) of values correlating a corrected calibration image to pixels from a distorted calibration image, the method comprising:

• determining a center point (Cx,Cy) of the original LUT;
• breaking the original LUT into four quadrants around (Cx,Cy);
• flipping the four quadrants such that each quadrant uses (Cx,Cy) as a lowest index;
• generating a mean value of values at common index value for the four quadrants;
• and
• storing the mean value at the index value of the QLUT in a memory of an image processing system.