Research On Embedded Microscopic Imaging System For High-precision Large-size Measurement

The acquisition and processing of image signal are used widely in the fields of scientific research, industrial and agricultural production, medicine and sanitation and so on. Meanwhile microscopic image acquisition is the basic of micro precision research, so the research on microscopic image acquistion system is very important and valuable. With the continuous development of computer technology, computer and a microscope the result of combining to make microscopic images can be completed image display and image processing by computer, but using computers as a system processor, the system will tend to increase the volume.This paper study on the basis of using embedded processors DSP as a microscopic imaging system. It can transmit the image under the microscope to monitor without distortion, and can store and process the image. So it not only replaces the computer, but also helps the system integration and miniaturization. According to the large-size high-precision measurement accuracy, using microscopic imaging system built high-precision measurement experiment platform, and research on the image stitching algorithm for observation of large-size image.This paper includes the following:1. Completed a embedded microscopic imaging system overall program design, the system is mainly composed of optical modules, image acquisition module, image processing module, image display modules and expansion modules.2. Researched on the optical connection plans and visual field matching plans for the embedded optical imaging system. According to the requirements of resolution system, using CODE V software, completed a microscope lens system and adapter-optical design and conduct the simulation. Researched on the classification and characteristics of lighting of the microscope. According to the characteristics of the system, designed transmission of lighting and reflective lighting solutions.3. Analysis of the image capture and display of the programm. Design of a microscopic imaging system embedded hardware circuits, including image capture and image display modules, the system pre-processor FPGA module and keyboard input modules, and complete the circuit debugging.4. Researched the Bayer image format conversion algorithms, designed a linear interpolation, edge detection and signal into three related interpolation algorithm, and transformed the image quality was assessed. Researched on microscopic image mosaic algorithm, Design a threshold segmentation, pixel projectors, and other methods to achieve a seamless mosaic of microscopic images.5. Designed embedded microscopic imaging of the experimental system to study the different lighting way to collect images of features, using a standard length of the objects, the system reached the measurement accuracy of the calibration.