Application of linear CCD image processing on self-collimation measurement of angle

When the self-collimation angle measuring equipment is working in outside field, it will be affected by a variety of factors such as airflow, the stray light, the temperature and so on. The display value will be unstable and the system will get low measurement accuracy. This problem is on one hand due to the increasing noise which participates in imaging of linear CCD. On the other hand, the sampling images become jitter both in location and amplitude. According to these problems, we can reduce these interferences by using hardware filtering and software method combined with adaptive integration time, image superposition and weighted barycenter algorithm in grayscale. The software for the system is realized based on the highperformance DSP platform. Experiment results show that, after the realization of these methods, the angle measuring equipment has the advantages of high-speed, stability, getting better repeatability and the ability of anti-interference.