Realization of auto-focusing system for cameras based on TMS320F2812 DSP

Focusing systems play an important role in a variety of optical measurements and detection instruments. In this paper, several kinds of auto-focusing methods were described and the relevant focusing evaluation functions were introduced based on image processing methods. An auto-focusing system based on image processing was designed by using the TMS320F2812 digital signal processing chip as a platform. Moreover, some problem and solutions about auto-focusing system was demonstrated. The system designed in this paper can find the good image plane in 10 steps (about 5 second), thus it can meet the requirements of practical applications.