Wide-angle lens image correction

摘要

A system for correcting distortion effects in a distorted image includes a memory controller for reading pixels (corresponding to a subset region in a destination image) of the distorted image from a system memory to local memory. A look-up table stores an offset and interpolation weight for each pixel, and an ALU computes, using stored values only in the local memory, values of each of the pixels in the region in the destination image.

主权项

1. A method for correcting a distortion effect in a distorted image, the method comprising:
selecting a destination macroblock in a destination image based on a size of a local memory; determining an x-coordinate offset and a y-coordinate offset for each pixel in the destination macroblock; identifying a source macroblock in the distorted image that corresponds with the destination macroblock, wherein a size of the source macroblock is selected to encompass the x-coordinate offset and the y-coordinate offset of each pixel in the destination macroblock; reading into local memory from system memory pixels corresponding to the source macroblock in the distorted image; reversing the distortion by computing, using information associated with the pixels stored in the local memory, revised values of each pixel in the destination macroblock in the destination image; and writing the computed values into system memory.