| 摘要 |
A technique for removing the effects of a particular optical aberration: Lateral Chromatic Aberration (LCA) in digital imaging systems is presented. The process is targeted on single, multi-spectral sensors, arranged in a predefined pattern with spectral filters. Removal process based on a pre-mosaicing or pre-interpolation processing of the RAW sensor data. This enacts a non-linear displacement of pixels with an inverse profile to the LCA produced by the optical assembly. The pre-mosaicing process is controlled by a multivariate mathematical model of the lenses lateral chromatic characteristics. The model is generated by capturing images of a calibration chart with known test points at different lens settings. In this way the lateral chromatic aberration content is precisely removed throughout the image region and lens range. The present invention also relates to an image processing program that realises the image processing device on a computer. Furthermore, the present invention relates to an electronic device, such as a camera or projector, that incorporates the image processing device. |
