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Research on Embedded Microscopic Imaging System for High-precision Large-size Measurement

Author: YangLi
Tutor: LiuTieGen
School: Tianjin University
Course: Optical Engineering
Keywords: DSP Microscope CMOS image sensor High-precision Large-size
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 114
Quote: 4
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Abstract


Image acquisition and processing of information, has been more widely used in the field of scientific research, industrial and agricultural production, and health. Microscopic image acquisition is micro-precision studies based on microscopic image acquisition system has important practical significance and value. As computer technology continues to evolve, the product of the combination of a microscope and a computer, the image can be done by computer image acquisition, display, processing work under the microscope, but the use of the computer as a system processor, tend to make the system bulky . In this paper, based on the design research using DSP processor embedded imaging system the microscope image transmission to the monitor on display, and image storage and processing, only instead of the computer's functions, but also facilitate system integration and miniaturization. Microscopic imaging system, designed according to the accuracy requirements of the high-precision measurement of large-size structures precision dimensional measurement experiment platform, and to study the microscopic image stitching algorithm for large-size image detection. In this paper, do the following: 1. Complete embedded imaging system overall program design, the system is mainly composed by the optical module, image acquisition module, image processing module, image display and expansion modules. Study and formulate embedded microscopic imaging system of the optical interface program, complete matching design of the visual field of the optical system. CODE V software in accordance with the requirements of the system resolution, and to complete the optical design of the microscope objective lens and adapter mirror system, and simulation. Classification and characteristics of the microscope illumination, the characteristics of the system were designed transmissive lighting and reflective lighting two lighting solutions. 3 in-depth analysis of image acquisition and display solutions, hardware circuit design of embedded micro-imaging system, including image capture and image display circuit, the system pre-processor FPGA circuit and keyboard control circuit and circuit debugging. Complete microscopic image acquisition and display software system design, design bilinear interpolation, three edge detection method and signal interpolation Bayer format image conversion algorithm, and, respectively, of the the converted image quality assessment, ultimately determine the signal interpolation; microscopic image mosaic algorithm design the threshold segmentation combined with pixel projection method, the microscopic images of seamless. Embedded microscopic imaging system is verified by experiments, analyzes the characteristics of the acquisition to image using different lighting methods, use of the standard length of the objects, verify the measurement accuracy of the system can be achieved, to meet the system design requirements. Using two-dimensional sample stage, combined with the image stitching algorithm research, to achieve a system of two-dimensional microscopic images seamless.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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