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In this paper, a monocular vision measurement method based on rotating lens is proposed. A special optical lens is placed between the target and the camera, which causes light refraction during the measurement process. By analyzing images taken after different light refraction, the 3D coordinates of the target can be obtained. Using this method, 3D measurement of the full field can be completed with...
It is difficult to obtain high-precision thermal geometric parameters of large hot forgings online because of the harsh measurement condition, the high-temperature and large-sized targets. To solve these problems, an online measurement method for thermal geometric parameters of hot forgings based on laser-aided multi-view stereo vision is proposed in this paper. The core content of the method is to...
Binocular vision measurement technology is widely used in large object measurement, such as large hot forging. However, the traditional method cannot satisfy the requirement of the binocular measurement system in the workshop, which is complex and fast-paced processing. Therefore, an improved binocular measurement system for large hot forging calibration method is proposed in this paper. The binocular...
In this paper, a monocular vision measurement method based on refraction of light is proposed. A flat glass board is placed between the target and the camera, which causes light refraction during the measurement process. By analyzing images taken before and after light refraction, the 3D coordinates of the target can be obtained. Using this method, only the thickness and refractive index of the glass...
Compared with the traditional video-based traffic surveillance, the highly-mounted video can surveil a larger range of traffic scene, and the vehicles in the video are rarely occluded. These characters of highly-mounted video-based traffic surveillance system make it more suitable for acquiring the traffic information of a larger traffic area. This paper present a framework of using highly-mounted...
This paper presents a passive-marker-based optical tracking system utilizing dual Kinect sensors and additional custom optical tracking components. To obtain sub-millimeter tracking accuracy, we introduce robust calibration of dual infrared sensors and point correspondence establishment in a stereo configuration. The 3D localization is subsequently accomplished using multiple back projection lines...
It is significant to have accurate localization of surgical instruments in navigated minimally invasive surgery. Moreover, instrument tracking modules are essential for cognitive surgical robotic systems. Commercial optical trackers have been developed with sub-millimeter accuracy, but typically work only at single spectrum — either visible spectrum or infrared spectrum, which limits the sensing and...
A 1D object is a segment with several known-distance markers, and calibration methods with 1D objects are more flexible than those with 2D/3D objects. Under the pinhole camera model, it is proved that the calibration with free-moving 1D objects is not possible. For a central catadioptric camera setup, can the camera be calibrated by a 1D object under general motions? In this paper, we prove that a...
In this paper, an intelligent control scheme based on remote gaze tracking is proposed. First, the eye-moving video of the user is captured by ordinary resolution camera under the illumination of near infrared light sources, then the images of the eye region and the pupil region are extracted by processing the video in real time. We process the image of the pupil region, and get the coordinates of...
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