Correction of non-uniformity response for multiple output TDI CCD imaging system

To solve the non-uniformity response of multiple outputs in TDI CCD imaging systems, every factors that may influence the non-uniformity response were analyzed in detail according to the flow of video signal process. Compared with popular correction methods of non-uniformity response, an improved method based on single point calibration was proposed, which integrated the advance of single-point correction and two-point correction methods. The improved single-point method has the features of simple algorithm, high efficiency, good practical application, low work of measurement, and so on. The results of experiments show that the non-uniformity response of TDI CCD imaging system declines from 3.5% to 1.5% according to the images using the improved method of single point calibration. The maximum of non-uniformity responses among multiple outputs is less than 2.5% during the full response range. The improved method of single-point calibration can satisfy the requirements of TDI CCD image systems and be practical in engineering.