The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Obstacle information detection is a prerequisite for safety and stability driving of unmanned platforms in the unknown environments. Joint detection of the obstacle using the 3D laser radar (3D LADAR) and camera is proposed in this paper. Firstly, joint calibration between 3D LADAR and camera based on the planar feature method is done. Secondly, laser point cloud is clustered to identify the number...
This paper proposes a novel infrared camera array guidance system with capability to track and provide real time position and speed of an air robot during a landing process. The system mainly include three novel parts: (1) Infrared camera array and infrared laser lamp based cooperative long range optical imaging module; (2) Large scale outdoor camera array calibration module; and (3) Laser marker...
The infrared camera array devices, which are important components of the air robot automatic optical navigation system, need to be calibrated for keeping the effectiveness and precision of tracking and location. We propose a brand new method for automatic calibration of infrared camera array, we focus on the rotation matrices and translation matrices between the cameras and the world coordinate. We...
Vision measurement technology research is active in recent years, which has broad application prospect in the fields of military and civilian industrial production. On the basis of comparing several existing measurement techniques, our paper mainly studied a method of geodetic coordinate calculation based on monocular vision on UAV platform, which is extension and expansion of the traditional monocular...
The step of calibration prevents the gaze interaction from interacting naturally, which usually needs five or more calibration points to obtain the user's calibration information. In this paper, a calibration simplified method is proposed, which is based on user experience and consists of the user experience accumulation stage and the calibration simplified stage. In the user experience accumulation...
After bearing off from the Lander on December 15, 2013, the Chang'E-3 “Yutu” Rover starts its three-month exploration journey around the lunar surface. During the exploration journey, the “Yutu” Rover should acquire its own position and orientation in time so that it can reach the target to be probed and accomplish the detection tasks, which depends on high-precision positioning and navigating methods...
In this paper, we conduct a comparative study of three well known robot kinematic calibration algorithms, namely the Denavit-Hartenberg (DH) parameter algorithm, the product of exponentials (POE) algorithm, and the local POE (LPOE) algorithm. To cope with distinct formulations associated to different algorithms, we propose a unified geometric framework which is based on POE kinematics and a novel...
This paper presents a design of a four phase 25% duty cycle of 400MHz DLL with calibration. To avoid the disadvantages of digital calibration method, it introduced an all-analog calibration method. Instead of DAC, CP is used in calibration loop to save power consumption and area occupying. With a 4 channel time-interleaved 6 bit flash ADC, the simulated results show that SNR is 30.8dB and 43.6dB with...
In this paper we present calibration and error analysis of our Ka-band fully polarimetric radiometer, the radiometer used a wideband microstrip correlator. The calibration method is based on the tri-polarimetric calibration technique of Gasiewski and Kunkee, but is extended to provide the calibration of the fourth Stokes parameter using a retarder plate. A method to determine the phase shift of the...
Soluble solids content (SSC) is one of the most important quality attributes of navel oranges, either for fresh or for processing market. Since, SSC can be measured only destructively, the results are representative only if carried out on large samples and do not allow classifying marketable fruit one by one according to their specific SSC. As a nondestructive method, Vis/NIR measurement of SSC of...
To the requirement and actuality of ground TT&C network multi-mission management in China, the idea of remote monitoring and controlling system constructed by client/server system is proposed. Firstly, the system frame of automatic monitoring and controlling for China TT&C network is studied. Then, the multi-mission automatic operation flow of ground TT&C network is studied. Finally, the...
Simulation modeling is an increasingly popular and effective tool for analyzing transportation problems that are not amendable to study by other means. For any simulation study, model calibration and validation is a crucial step to obtaining any results from analysis. This paper proposed a systematic, practical procedure for microscopic simulation model calibration and validation. The validity of...
Spectral technique can provide a rapid, nondestructive means to assess quality and safety of agricultural commodities for human consumption. A procedure for determination of dichlorvos contamination has been developed with Vis-NIR spectroscopy. Four spectral preprocessing methods, including multiplicative scatter corrections (MSC), standard normal variate (SNV), first derivative (FD) and second derivative...
The CCD pixels nonuniformity may give a greater margin of error to measurement results in the high-precision CCD measurement and servo control system. The paper analyzes the image pixels nonuniformity caused by noises, and establishes the corresponding image model. Adaptive threshold value segmentation algorithm is used for image binarization. An algorithm using two point linear method for pixel nonuniformity...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.