Research On Embedded Signal Processing Technology Of High-Definition Electronic Endoscope

The medical electronic endoscope has been widely used nowadays. Doctors can not only observe the structures of internal organs and diagnose lesions, but also can make interested images and videos displayed and stored. With the continuous improvement of image sensor technology, one of research directions of electronic endoscopes is High-Definition (HD) video. The performance of domestic products is generally not satisfying at the moment and the market has almost been monopolized by a few large foreign manufacturers.This paper aims to study HD electronic endoscope embedded signal processing techniques by adopting the latest CMOS image sensor, high-performance processing chip and real-time operating system. The research mainly includes hardware and software design of HD medical electronic endoscope. According to the property and application of the system, the solution of adopting CMOS image sensor for imaging, LVDS technology for image transferring in front-end, and ARM A8and Windows CE operating system for image acquisition and process was selected after analysis and comparison. Main work includes the following two aspects:(1) Miniaturized camera module design, decode board and driver design, button panel and driver design and ARM system design. In order to realize CMOS’s acquisition of video images, and simultaneously to transfer parallel digital image data to ARM system by LVDS technology.(2) Window CE driver and application design to acquisition, mosaic, and image enhancement processing of image data, to achieve real-time display on the LCD screen, and to store interested images and videos.The performance of CMOS image sensor based High-Definition medical electronic endoscope system has reached the international advanced level, and with practical applications. Applications of objective lens with wide field of view and the CMOS image sensor applications make the system having a90degree field of view and the resolution of1280×800. The ARM system achieves performance of real-time image acquisition, display and processing. With the adoption of LVDS technology, working distance of the front-end has extended up to3meters, and reduced the number of cable wires. The adoption of ARM A8chip gives the system relatively strong image processing capabilities. The use of Windows CE operating system has greatly shortened the development cycle, has made applications more robust, efficient and reliable, and simplified system development.