Method and apparatus for determining and correcting geometric distortions in electronic imaging systems

摘要

A method and apparatus is provided to determine geometric distortion of an electronic imaging system, and an apparatus is provided to correct geometric distortion of the electronic imaging system and generate geometric distortion-corrected images. The novel geometric distortion measurement system comprises a light source, a collimator, a two dimensional steering device including a driver, and a control device for automatic sampling of the geometric distortion mapping of the electronic imaging system, and writes the results of distortion sampling into an associative memory. The sampling comprises multiple examples of the geometric distortion mapping across the image plane. Each example includes an ideal position of image pixel and its actual registration on the image plane. The measuring device take one example at a time until the whole sample is accomplished. The geometric distortion correction system utilizes associative memory to revise intensity arrays and generates geometric distortion-corrected images by using geometric interpolation and intensity interpolation methods.