Methods and apparatuses for addressing chromatic aberrations and purple fringing

摘要

Methods and systems for detecting and correcting chromatic aberration and purple fringing are disclosed. Chromatic aberration can be addressed by separating an image into color planes and then adjusting these to reduce chromatic aberration by using a specific calibration image (calibration chart) as an empirical method to calibrate the image acquisition device. Purple fringing can be corrected by initially addressing color aberration resulting from the lateral chromatic aberration (LCA). The LCA is first removed and then the correction is extended to purple fringing. A discovery is relied upon that the purple fringing is created in the direction of the chromatic aberration and is more pronounced in the direction of the chromatic aberration.

主权项

1. A processor-implemented method of correcting lateral chromatic aberrations in digital images within a digital image acquisition device, comprising:
calibrating a camera-lens pair, wherein the calibrating comprises:
detecting a point of a test image based on one or more characteristics of the point;determining that the point is part of a measurement point;measuring aberration of one or more colors at the measurement point; andinterpolating scattered data; acquiring a digital image; correcting lateral chromatic aberrations within the digital image, including:
finding a displacement for a current pixel in a temporary buffer;designating the displacement as a relative position in a source buffer; andinterpolating a displacement value; and outputting, storing, displaying, projecting, or transmitting a corrected digital image which has been corrected for lateral chromatic aberrations in two dimensions, or a further processed version of the digital image, or combinations thereof.