AN EFFICIENT SPECTRAL-BASED CALIBRATION METHOD FOR RGB WHITE-BALANCING GAINS UNDER VARIOUS ILLUMINATION CONDITIONS FOR CELL-PHONE CAMERAS

摘要

Significant sensitivity variations among cell-phone camera modules have been observed. As a result, for an effective and reliable white balancing, per-module RGB-ratios calibration/estimation under various illumination conditions is required. Herein, a new technique is proposed which minimizes/simplifies RGB-ratios calibration/estimation process. The proposed method could be based on either direct image capture or spectral numerical processing～the latter is shown to be more flexible and accurate.