A REAL-TIME TRACKING ALGORITHM FOR THE ULTRASONIC EMULSIFICATION PROBE
This paper presents a real-time tracking algorithm which is used to track the ultrasonic emulsification probe during cataract remove operation. Nowadays, the principle way to remove a cataract is still ultrasonic emulsification operation. Even the most advanced emulsification facility has the disadvantages that ultrasonic energy release can only be controlled manually. To solve this problem, the hardness of the cataract in front of the probe can be categorized and be used to automatically control energy release. This gives rise to the problem of real-time probe tracking. The aim of tracking is to obtain images of tissues in front of the probe for the task of categorization, and thus for energy release control. CamShift algorithm and Kalman filter are combined to predict and locate the probe. To deal with the problem of tissue variation, a new template updating method is proposed. The new template is obtained by weighed sum of former template and current best-matching image. The oldest template and its relevant coefficients in the buffer are replaced by the new one. The template has the largest relevant coefficient is selected as the target template in next frame. In this way, the matching performance is improved greatly. Experimental results show that this method can achieve more accurate tracking no matter how the probe is sheltered or rotates.
probe tracking Kalman filter CamShift algorithm template updating cataract removing
Lihong Wei
School of Information Engineering,University of Science and Technology Beijing,Beijing 100083,China
国际会议
2008年拟人系统国际会议(2008 International Conference on Humanized Systems )(ICHS’08)
北京
英文
2008-10-18（万方平台首次上网日期，不代表论文的发表时间）