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As the capsule endoscope lens will produce geometric distortion, while there is an angle and a corner between the camera image plane and the plane of scene, so the images of capsule endoscope get nonlinear geometric distortion. Before the capsule endoscope images are used to accurately analysis, we should eliminate these distortions. Typically, the correction uses a calibration pattern, which can...
Comparing with those calibration methods used in the visible light, this paper proposes a new calibration method used in the infrared ray environment. This method stems form Zhang zhengyou's planer method. Firstly, we design a move path to replace the gridiron pattern which is invisible in the infrared ray environment. Then we use the C.M.M to control a visible ball in the infrared ray environment...
Computer aided surgery (CAS) often involves the use of instrument, implants and other interactive device whose pose is tracked in real time so as to provide navigated positioning of the instrument to guide the surgeon carrying out the operation. The infrared tracking system has been proved to be a valuable alternative to tracking system based on other technologies, such as magnetic, acoustic, gyroscopic...
The Wireless Capsule Endoscopy (WCE) has been gradually used in hospitals due to its breakthrough that it can view the whole gastrointestinal with less suffering. Nevertheless, it generates too many images each time causing a huge burden to physicians; therefore it's meaningful to help physicians to employ computerized methods to diagnose. One important way is to build up three-dimensional (3D) model...
Camera calibration is a necessary step in 3D computer vision in order to extract metric information from 2D images. In the camera calibration applying to multi-camera localization, it's prerequisite that all cameras, which mounted apart from each other, must observe the whole calibration object simultaneously. However, it's inconvenient to satisfy using traditional 3D or 2D calibration objects. In...
To track the movement of wireless capsule endoscope in the human body, we design a magnetic localization and orientation system. In this system, capsule contains a permanent magnet as the movable object. A wearable magnetic sensor array is arranged out of the human body to capture the magnetic signal. This sensor array is composed of magnetic sensors, Honeywell product HMC1043. The variations of magnet...
In the RoboCup competition, vision system is regarded as of great importance with its high information contents, convenient implementation, and suitability for human sights of common and inexpensive hardware. In this paper, we discuss the vision system of ROBOCUP Small Size League, and introduce a digital way for segmentation of this color based robotic motion, camera calibration is also included...
A magnetic localization and orientation system is proposed for tracking wireless capsule endoscope. This system uses a small magnet enclosed in the capsule to serve as excitation source. When the capsule moves, the magnet establishes a static magnetic field around. With the magnetic sensor array composed of Honeywell 3-axis magnetic sensors, HMC1053, the magnetic intensities in some pre-determined...
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