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The Digital Beamforming (DBF) technology can not only improve the performance of phased array radars, but also can extend their function, so it has been increasingly used in modern radar system. This paper introduces an active phased array 3D air-surveillance radar system based on the receiving DBF. The system consists of planar array, DBF modules, DBF processor, etc. Design consideration for transmitting...
In this work we present a prototype of a precise freehand 3D/4D ultrasound imaging system equipped with an universal wireless 3D tracker for digitizing spatial coordinates of an ultrasonic transducer, consider the system calibration using a plane phantom and carry out validation of the setup on a pig heart specimen. The system basic functionality, features and an application for cardiac purposes are...
A lens-array-based integral imaging camera is studied in this work, which consists of a lens array, a main lens and a CCD camera. The lens array is placed on the object side of the main lens, thus can provide wider stereo baseline than other lens-array-based integral imaging cameras where the lens array is usually placed on the sensor side. However, the image captured by this system presents severe...
This work investigates a lens-array-based integral imaging system which consist of a lens array, a main lens and a CCD camera. The lens array is placed on the object side of the main lens, thus can provide wider stereo baseline than other lens-array-based integral imaging system where the lens array is usually placed on the sensor side. However, the image captured by this system presents severe non-linear...
We propose a joint multi-camera calibration algorithm based on iterative factorization of the measurement matrix. The matrix is composed of homographies between the model plane and its images. Rescaling and decomposition of the measurement matrix are implemented with series of 3D reconstruction techniques. Since these techniques deal well with the missing data, the model plane disposed in the calibration...
Camera-arrays have become popular in many computer vision and computer graphics applications. Among all preprocessing steps, an efficient method to calibrate a large number of cameras is very much desired. The required calibration includes both the geometric and photometric calibration, which are the most common and also well studied for single camera. However, few existing efforts are devoted to...
In this paper, we present the first algorithm to geometrically register multiple projectors in a view-independent manner (i.e. wallpapered) on a common type of curved surface, vertically extruded surface, using an uncalibrated camera without attaching any obtrusive markers to the display screen. Further, it can also tolerate large non-linear geometric distortions in the projectors as is common when...
Multiview video contains more views of scene providing the view-navigating and interactive ability which pull more attention in recent years. 3D and free viewpoint video was investigated and appeared in MPEG standard called 3DAV. The requirements of multiview video capture system are investigated, and we built a simple capture system regarded as the more important module of whole multiview video system...
Ultrasound imaging relies heavily on the skills of the sonographer, requiring extensive hands-on training. The Interactive Training System for Medical Ultrasound is an inexpensive, software-based training system, in which the trainee scans a lifelike manikin using a sham transducer, containing a 6 degree of freedom (DoF) tracking sensor. The observed ultrasound image is generated from a pre-stored...
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