顯微鏡快速自動對焦技術(shù)研究
[Abstract]:As one of the key techniques of microscopic imaging system, automatic focusing plays an important role in improving the efficiency of microslice scanning. At present, in the application of industrial field, the technology of microslice scanning mainly adopts off-line focusing method, which can not obtain the defocus quantity quickly at any transverse position, so it is necessary to model the focal plane of the whole tissue surface before scanning. The scanning efficiency is low. Some on-line auto-focusing methods solve the problems of obtaining defocus at any transverse position and improving scanning efficiency to a certain extent, but there are still some problems such as delay of acquisition of focusing signal, complex structure and high cost. Aiming at these problems, this paper presents an automatic focusing method based on tilted camera and forward camera, which has the advantages of fast speed, no delay, simple structure and so on. In this paper, the theoretical analysis of tilted camera focusing, the modular design of focusing system, the realization of focusing system and so on are explored and studied, and the performance of focusing system is tested and analyzed. The main research contents are as follows: firstly, from the point of view of the rapidity of the focusing system, the method of how to obtain the eigenvalue of the tilted camera is proposed, and the theoretical relationship of realizing the tilting focusing principle is obtained. Three key technical problems of tilted focusing system are analyzed, including the selection of tilt angle of camera, the position relationship between tilted camera and positive camera, and the mapping relationship between eigenvalues and defocus. The theory and method of tilt angle selection are studied in depth. This paper discusses the influence factors of tilting focusing system, and draws the conclusion that depth of field, resolution and image uniformity can reduce the influence on system by changing system parameters. The illumination system of single lens aspheric condenser is designed and developed. Secondly, on the basis of tilting auto-focus theory, the fixed structure of tilting camera is designed. This paper analyzes and selects the definition evaluation function of the evaluation feature image, compares the five algorithms, and determines the Tenengrad algorithm with better performance, such as efficiency, single peak, sensitivity and so on. A reasonable ROI region is designed to improve the computational efficiency of the image algorithm. A motion control system based on STM32 microprocessor is designed. The motion control of the platform is realized. The subsection control algorithm is designed and analyzed to reduce the influence of motor oscillation and threshold selection on the imaging stability. Thirdly, Motic Calibration Slide samples are used to calibrate the position of the two cameras, and the feature images are acquired. The mapping curves between eigenvalues and defocus values are calibrated experimentally. The errors between theoretical curves and measured curves are analyzed and the feasibility of tilted focusing system is verified. The man-machine interface is studied and designed, and the integrated focusing function is realized. Finally, the performance of the tilted focusing system is tested. In the aspect of focusing efficiency, the fast focusing of 1.08s is realized, and the scanning efficiency of microslice is increased by an order of magnitude. In sensitivity, the measured sensitivity is 12pixel/ 渭 m, which is slightly lower than the theoretical value. The measured range of work is 105.2 渭 m ~ (48. 8) 渭 m, which can meet the requirements of biological tissue samples.
【學(xué)位授予單位】:華僑大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TP391.41
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