The technology of three-dimensional laser imaging is applied widely in the field of military use and civilian use etc.
There are mainly two methods for three-dimensional laser imaging. One of them is based on APD arrays, and the other is
based on streak tube. The latter represents relatively mature technology for providing high-resolution 3D laser radar
images. In both of them, the realization of intensity image and range image is the foundation and key of
three-dimensional laser imaging. It presents the method for three-dimensional laser imaging using multiple-slit streak
tube to get clear, exact intensity image and range image. The multiple-slit streak tube imaging lidar (MS-STIL) approach
uses several slits instead of the usual single slit to provide a number of additional capabilities over conventional laser
radar systems. And it researches into the algorithm for the realization of intensity image and range image and processes
the simulative streak tube image with it via the analysis of multiple-slit streak tube's imaging theory, and finally carries
through the simulation of intensity image and range image.
Based on the theory of lidar system,a model of lidar system was established. We focus on the math model of the
noise and the simulation of NEP and SNR, and designed relative programmes for it. In case of different existing
models on transmitting system, air condition and detecting system, simulation for lidar system can be realized.
Rational and effective design of imaging laser radar systems is the key of imaging laser radar system research.
Design must fully consider the interrelationship between various parameters. According to the parameters, choose
suitable laser, detector and other components. To use of mathematical modeling and computer simulation is an effective
imaging laser radar system design methods. This paper based on the distance equation, using the detection statistical
methods, from the laser radar range coverage, detection probability, false-alarm rate, SNR to build the laser radar system
mathematical models. In the process of setting up the mathematical models to fully consider the laser, atmosphere,
detector and other factors on the performance that is to make the models be able to respond accurately the real situation.
Based on this using C# and Matlab designed a simulation software.
A new method of 3D multi-spot surface profiling for patient's positioning is presented in this paper. In the approach, an encoded pattern structured light is used to project onto the target to be positioned, which is typically part of the patient surface. A single camera is used to image the projected light beams and the range data from camera to the target points can be extracted from the image of the deformed pattern. Because the light pattern is encoded, the correspondence between the projected beams and imaged beams is easily determined and, hence, the range data can be calculated quickly. The 3D sensing method here is based on the active light illumination triangulation. A detail description of the method is given, including system configuration, algorithms for solving the correspondence problem, reconstruction of the point's 3D position, calibration and experimental results, etc. One of the features of the system is extremely simplicity in hardware. And there is no movement part in the system. The encoded grid beam pattern makes it possible to solve the problem of the correspondence between the illuminated spots on the patient and their image points on the image plane. Also, the 3D reconstructed coordinates can be obtained from only one picture frame captured and the time consuming for computer is reasonably reduced.
A simple microprocessor controlled optical sensor is proposed in this paper. It can measure two kinds of optical information: the distance between sensor and the illuminated area of the object and the inclination angles of that area. Under the control of the microprocessor, the sensor can also profile a full 360 degree(s) 3-D picture of the object by scanning a scene mechanically in vertical dimension and rotating the object to be measured in the horizontal plane. The proposed sensor has been assembled and some preliminary experiments show that it can sense the distance with a range of 10 cm in accuracy of +/- 1 mm for objects having diffuse reflectivity and the inclination angles of the area with a range of +/- 20 degree(s) with accuracy of 1.5 degree(s). A shape of a mannequin head is profiled in a full 360 degree(s) way.
Conference Committee Involvement (2)
International Conference of Optical Instrument and Technology