Non-uniformity correction in multi-CCD imaging system

The non-uniformity phenomenon exists in each channel of multi-CCD imaging systems. The factors which lead to the problem are complex. The conventional calibrating algorithms can not consider all of these factors and have poor effects. According to the characters of multi-CCD imaging systems, a non-uniformity correction method based on the scene was proposed by adopting the traditional two-point correction theories. The correction coefficient of each channel image can be calculated via the linear relation between the two neighboring pixel lines in the two-channel images. Compared with the conventional two-point calibration and multi-point calibration methods, contrastive calibrating results were obtained. This method does not need any standard lighted image as reference source, which provides a real time way for calibrating the multi-CCD imaging systems in practical applications.