An Approach for Auto Focusing Based on Image Analysis

摘要

The focusing system is an important factor to determine the imaging quality of a camera. And the image sharpness evaluation algorithm is a key aspect in implementing the focusing system. Now, various evaluation algorithms exist, but there are some deficiencies for implementing the software auto focusing system. A new evaluation method based on the image absolute central moment is presented in this paper. It is more efficient, reliable and accurate than others. On this basis, a focal plane searching algorithm and a focusing window select method are proposed, and an efficient, reliable and robust auto focusing system is implemented.