Study On Image Receiving Device In Vitro Of Capsule Endoscopy

Capsule endoscopy has played an important role at inspection of digestive tract disease for patients and illness diagnosis for doctors. Not only it overcomes the limitations of sensitity and accuracy of traditional pipeline endoscope,but also reduces the trauma and pain bring from traditional examination for patients and provides the most direct,real-time gastrointestinal wall image for doctors, which has greatly enhanced the diagnosis rate. Video receiving device in vitro is a very important part in capsule endoscopy system. Along with the development of the embedded technology, the part of video receiving device in vitro gradually has been portablely designed based on embedded technology. This paper puts forward a kind of method of video receivers in vitro in capsule endoscopy based on ARM + FPGA, which makes a patient feel more free than ever before, no more for time and space limits, no more stand for the annoyance from long time checked by fixed position when during the gastrointestinal lesions inspection. Mainly research work of this paper is as follows:According to existing wireless transmission system of video image and design requirements, we design the module of analog video image decoding, which changes the analog video image into digital video image. To satisfy digital processing, it separates video signal and synchronous signal from composite video images; Considering the energy management mode of energy management unit, the system starts one time for every minute. To reduce the serious interference caused by voltage overshoot problems, we designs logic control of video image acquisition based on FPGA , to automatic detect and abandon damaged image data, and ensure receiving effective image data, and make function simulation; Effective video data is transferred to ARM9 processor. Using embedded Linux manage system, we develop GUI application program of capsule endoscopy system based on QT/Embedded, and realize image capture and display through the directly communication between QT API and Video4Linux2 video images application programming interface; At last, using SD card as storage medium for video image data, the doctor can conveniently read it into computer for further analysis and archive.With this portable video receiving device in vitro of capsule endoscopy designed in this paper, doctors or patients can operate this device by graphical interface through the touch screen, simple and conveniently, and may observe the real-time image of digestive tract without computer, without limits of time, place and posture. It truly reflects the concept of "people-oriented".