Realize the Image Motion Self-Registration Based on TDI in Digital Domain

A novel image motion self-registration algorithm was proposed and realized to improve the effectiveness of Time-Delay-Integration image processing. First, to overcome the defects of the on-chip accumulator, a CMOS camera with off-chip digital accumulator was designed. Compared to the traditional on-chip Time-Delay-Integration, the new off-chip digital Time-Delay-Integration cost none silicon area and can integrate signal processing easily. The novel algorithm was developed to work with this new off-chip digital Time-Delay-Integration. To assess the proposed algorithm, simulations and experiments were carried out. With the new algorithm, the cross-correlation similarity of the Time-Delay-Integration images improved from 0.9257 to 0.9587, even when the image motion mismatch rate is 0.1. Further experiments proved the effectiveness of the proposed algorithm when the image motion mismatch is existing. This algorithm is suitable for applications in remote sensing systems with characters of low-illumination and high scanning speed.