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The measurement of safe driving distance based on stereo vision is proposed. The model of camera imaging is established using traditional camera calibration method firstly. Secondly, the projection matrix is deduced according to camera's internal and external parameter and used to calibrate the camera. The method of camera calibration based on two-dimensional target plane is adopted. Then the distortion...
We propose an algorithm for finding out the single or multiple camera calibration planar coded patterns from an image with a complicate background, and provide a kind of patterns design for multi-pattern calibration accordingly. Until recently, the camera calibration planar pattern recognition methods proposed are mainly the recognition of the calibration pattern from images with a single pattern...
A PTZ camera has the capability to cater to a much larger area of coverage when compared to a fixed field of view (FOV) camera. However, to utilize the full capability of a PTZ camera, it is necessary to have analytics to support event based autonomous camera control, such as automatic tracking of moving objects (people and vehicles), and zooming on to a face or car license plate to get a closer look...
The similarity invariants of a triangle are introduced in this paper firstly, and the constraints between the camera intrinsic parameters and its similarity invariants are discussed under simplified camera model when a triangle performs a special motion. 2N images of the triangle can produce 2(N-1) quadratic equations about the intrinsic parameters of the camera while the triangle does parallel motion...
In this paper, a novel method for depth estimation through fusion of stereo and TOF is proposed. Both the depth data and intensity gray images from TOF are taken into the calibration processing for getting the more accurate camera exterior parameters. Using the exterior parameters, the depth image captured by TOF is warped to the scope of the CCD camera pairs to form an initial depth image. Due to...
A set of solutions for vehicle tracking module of intelligent transportation system is proposed. A vehicle tracking system based on color histogram distance and binary information is implemented. The System solves camera calibration, vehicle moving prediction, vehicle tracking and other issues. Three experiment under different scenarios results that the accuracy of the vehicle identification up to...
Camera calibration is to confirm the camera's geometrical and optical parameter, as well as the orientation of the camera frame relative to world coordinate system. There are various calibration methods in different fields. Based on seven styles standards, paper analyzes and compares those methods systemically, then interesting avenues for future research are proposed.
Strian measurement is an important issue in the mechanics of materials. In order to develop high-precision measurement system of video extensometer, a measuring model of single-camera measuring object on a fixed plane is established. Based on this model, lens distortion can be corrected by camera calibration and the transformation relationship from the spatial location of object to pixel coordinates...
The compositing of two or more objects into a single image is a common form of manipulation. We describe how such composites can be detected by estimating a camera's intrinsic parameters from the image of target objects. Differences in these parameters across the image are used as evidence of tampering.
To satisfy the demand of the real-time computer vision system, a method of camera calibration was analysed. According to the camera model from OpenCV(Intel Open Source Computer Vision Library), with radial aberration and tangential aberration considered, Zhang's arithmetic of camera calibration was applied. As the experimental result showed, the arithmetic exerted OpenCV library function at a great...
The development of tracked 3D displays is based on real-time technologies providing precise and robust eye location detection. The paper focuses on tracking approaches which have been developed within the European HELIUM3D project. A first system uses multiple common video cameras and a second approach is combining high resolution and depth camera technology. Flexible and scalable software has been...
The camera calibration problem consists in estimating the intrinsic and the extrinsic parameters. This problem can be solved by computing the fundamental matrix. The fundamental matrix can be obtained from a set of corresponding points. However in practice, corresponding points may be inaccurately estimated, falsely matched or badly located, due to occlusion and ambiguity, among others. On the other...
In film production, many post-production tasks require the availability of accurate camera calibration information. This paper presents an algorithm for through-the-lens calibration of a moving camera for a common scenario in film production and broadcasting: The camera views a dynamic scene, which is also viewed by a set of static cameras with known calibration. The proposed method involves the construction...
In order to describe the camera internal geometrical and optical parameters, and the relation between camera and object in three-dimensional space, traditional camera calibration methods usually need to assume lots of priori knowledge, establish precise mathematical model and then decompose and calculate those parameters we need. While artificial neural network has outstanding non-linearity mapping...
For the applications of technology of camera calibration to binocular stereo vision system, the camera model in OpenCV (open source computer vision library) is discussed, the non-linear distortion of the tangential and radial distortion aberration is considered. Article gives an arithmetic of camera calibration based on OpenCV. This arithmetic makes use of the functions of the library effectively,...
This paper proposed a visual servoing system for autonomous mobile robot navigation under an eye-to-hand camera configuration using omnidirectional vision. The proposed algorithm is based upon Position-Based Visual Servoing (PBVS) and uses only one fixed camera to provide the global path planning. The image is captured by the omnidirectional camera mounted on the ceiling followed by camera calibration,...
Currently, the price of digital camera is decreasing and many users afford to purchase it. The digital camera can be used for many applications. The digital camera can also be used for accurate measurement such as determination of three dimensional (3D) coordinates, production of accurate measurement and generation of 3D model of objects. However, the digital camera need to be calibrated to obtain...
This paper proposes a technique of camera calibration to calibrate a camera. It is easy for the proposed technique to extract the camera parameters with only one image using an iteration method. In this paper, radial and tangential lens distortion is modeled. The proposed technique divides original parameters into block of parameters. Each block of parameters is computed by minimizing a nonlinear...
There has been a significant advancement in the remote sensing and mapping technology in the last few decades. Due to its decreasing cost and increasing resolution, digital cameras are rapidly replacing the need for the conventional large format analogue cameras. Also, with the advent of GPS/INS, direct sensor orientation became possible, providing the means for an almost control-free mapping environment...
In order to calibrate cameras and robot models precisely in industrial practice, a novel dynamic uncalibrated eye-in-hand visual servoing system to track a moving target is proposed. The method does not require calibration of camera and robot kinematic models. Visual serving algorithm to track dynamic image is developed through minimizing nonlinear objective function. Because the large residual is...
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