36 results about "Active stereo" patented technology

Described herein is a novel 3-D optical imaging system based on active stereo vision and motion tracking for to tracking the motion of patient and for registering the time-sequenced images of suspicious lesions recorded during endoscopic or colposcopic examinations. The system quantifies the acetic acid induced optical signals associated with early cancer development. The system includes at least one illuminating light source for generating light illuminating a portion of an object, at least one structured light source for projecting a structured light pattern on the portion of the object, at least one camera for imaging the portion of the object and the structured light pattern, and means for generating a quantitative measurement of an acetic acid-induced change of the portion of the object.

A stereoscopic 3D imaging system includes multiple imaging sensors with adjustable optics. The adjustable optics are variable to alter the FOV of each of the multiple imaging sensors to improve angular resolution of the imaging system.

A three-dimensional stereo display, and a system and method are provided for controlling the three-dimensional stereo display. The three-dimensional stereo display includes backlight, a first polarizer, a first liquid crystal panel, a second polarizer and a second liquid crystal panel which are sequentially arranged on the backlight source. The second liquid crystal panel switches the polarizing angle of the light travelling through and exiting from said second liquid crystal panel between a horizontal and vertical polarization. Due to the polarization direction of light could be changed by the liquid crystal panel, and makes the light for the left-eye image and the right-eye image are mutual perpendicular. The polarization direction of the light for the left-eye image is the same as that of the left lens, and the polarization direction of the light for the right-eye image is the same as that of the right lens. So the light belongs to the left-eye image or the right-eye image can pass through the left lens or the right lens respectively, then a stereo image will emerge in people's brain due to the effect of “fusion activity”. Further, there is no need to close the polarized spectacles, the displaying efficiency is improved compared with the “Active Stereo”.

A hybrid 3D optical scanning system combining methodologies of active stereo 3D reconstruction and deflectometry to provide accurate 3D surface measurements of an object under inspection. In a preferred embodiment, the present system comprises a calibrated digital camera stereo pair and first digital projector for active stereo 3D reconstruction metrology positioned at selected distance apart on the same horizontal plane facing the inspection object at an optimal incidence angle relative to the object surface. A secondary digital projector for deflectometry is directed to project a pattern sequence across the optical projection path of the first digital projector and onto a nonplanar deflection screen extended between the digital camera and the inspection object at a selected angle relative thereto, the selected angle being chosen so that that the pattern projected onto the deflection screen by the secondary digital projector reflects from the surface of the inspection object towards the digital camera. Calibrated active stereo 3D reconstruction is used to derive global shape and the uncalibrated nonplanar deflected light acquires curvature of local fine deformations and surface imperfections along the object surface. The calibrated camera allows per pixel correlations to be defined between the separate acquisition methods and produces accurate absolute measurements of both shape and local features of specular, glossy, metallic curved surfaces.

The invention discloses a method for constructing a visual system for aerial refueling simulation training based on virtual image display and active stereo technology, and belongs to the field of visual simulation of flight simulators. The method comprises a multi-channel visual synchronous stereoscopic rendering module, an active stereoscopic projection display module and a binocular head position motion capture module. The multi-channel visual synchronous stereo rendering module includes multi-channel visual rendering equipment and synchronization equipment; the active stereo projection display module includes active stereo projectors, synchronization signal transmitters and virtual image display equipment; the binocular head position motion capture module includes optical marker stereo Glasses helmet and binocular motion capture camera. The method enhances the synchronization performance of the device and the tracking performance of the pilot's head movement and attitude, meets the requirements of simultaneously presenting the depth sense of the visual environment of refueling in the air and the sense of out-of-screen, and has a virtual image display device for simulation training of refueling in the air It has the advantages of low cost, high synchronization accuracy of visual images, and high accuracy of pilot head posture tracking.

A traffic accident site surveying and mapping instrument based on active stereoscopic omnidirectional vision, including an omnidirectional visual sensor with a fixed viewpoint, a laser panorama structured light generator with a fixed central point of light emission, a connecting bracket, used to locate a traffic accident scene and an automatic The GPS sensor that generates the road plan and the microprocessor used to draw the road traffic accident scene map for the image of the omnidirectional visual sensor, the fixed viewpoint of the omnidirectional visual sensor and the fixed luminous center point of the laser panoramic volume structured light generator are at the same On the axis; the microprocessor includes LD light source control unit, video image reading module, camera point location information acquisition module, preset road plane map generation module, orientation information analysis module, on-site video image processing module, and spatial location information of each measurement point Calculation module and on-site accident map generation module. The invention simplifies the complexity of calculation, omits the camera calibration work, has strong environmental applicability, and measures quickly and accurately.

A head-mounted device (HMD) is configured to perform depth detection with a stereo camera pair comprising a first camera and a second camera, both of which are configured to detect / capture visible light and IR light. The fields of view for both of the cameras overlap to form an overlapping field of view. The HMD also includes an IR dot-pattern illuminator that is mounted on the HMD with the cameras and that is configured to emit an IR dot-pattern illumination. The IR dot-pattern illuminator emits a dot-pattern illumination that spans at least a part of the overlapping field of view. The IR dot-pattern illumination adds texture to objects in the environment and enables the HMD to determine depth for those objects, even if they have textureless / smooth surfaces.

An improved vehicle surface scanning system for assessing the damaged surfaces of a vehicle with resulting estimates of repair costs. A mobile scanning booth is assembled in an open-ended tunnel-like rig having a plurality of reflective panels positioned along opposite sides and across the roof of the booth to serve as deflection screens. A plurality of scanner modules are mounted in fixed positions about opposite ends of the booth and positioned to face the interior of the booth. Wheels provide controlled locomotion / movement of the scanning booth over the vehicle. The scanner modules use a combined hybrid methodology of active stereo 3D reconstruction and deflectometry to acquire data measurements along the surfaces of the vehicle incrementally as the booth is moved. The incremental measurement data acquired during the mobile scanning is processed and furthermore combined to produce accurate reports of the damage surfaces and estimates of associated repair costs.

The invention belongs to the technical field of service robots, and specifically relates to a calibration method for an active stereo vision system, aiming to solve the problem that it is difficult to achieve high-quality calibration when the optical centers of each camera in the active stereo vision system deviate from the corresponding rotation axis. The method includes obtaining the first image, the second image, the third image, the fourth image, the fifth image, and the sixth image; obtaining the relative poses before and after rotation of each camera of the active stereo vision system; obtaining the corresponding rotation axis of each camera The rotation vector; combined with the rotation vector and rotation angle corresponding to the rotation axis of each camera, obtain the pose of the rotation axis of each camera in the corresponding predefined initial position coordinate system; obtain the initial position of the first camera and the second camera Then the relative pose between the rotation axis of the first camera and the rotation axis of the second camera is obtained; the external parameters of the active stereo vision system are updated online. The invention improves the calibration quality of the active stereo vision system.

The invention provides a lunar surface extravehicular auxiliary operation robot and its control method. The lunar surface extravehicular auxiliary operation robot has a left-right symmetrical structure, including: a force-bearing fuselage, a motion system, a visual perception system, an operation system, a power supply system and a control system. system; motion system includes asynchronous self-stable suspension system and lunar wheel system; visual perception system includes binocular stereo vision camera, camera hood, two-degree-of-freedom active servo pan-tilt, pan-tilt dust cover and hollow camera mast; operation The system is a lightweight three-degree-of-freedom robotic arm based on joint modules. The extravehicular auxiliary robot for lunar astronauts provided by the invention has the characteristics of compact volume and structure, light weight, rich single-machine task capability, and strong multi-machine system expandability. It has the ability to walk smoothly and efficiently under the natural terrain of the lunar surface, the ability of active stereoscopic vision perception and multi-degree-of-freedom operation, and can carry out auxiliary operations on the lunar surface in the mode of remote operation or on-site human-computer interaction.

The invention discloses a method for measuring simulated seabed terrain based on an active stereo vision technology and measuring equipment. By the stereo vision technology, a binocular camera is arranged on the outside of an experimental trough, and seabed terrain changes are measured contactlessly through glass sidewalls of the experimental trough. Partial flow field will not be disturbed, and synchronous acquisition of the whole simulated seabed terrain can be realized. According to the invention, the active vision technology is used in underwater measurement. That is to say, by the utilization of auxiliary structured light irradiating underwater terrain through the glass sidewalls of the experimental trough, dense structured textures or dot arrays are formed on the terrain such that the camera can distinguish more easily. Meanwhile, quantity of terrain characteristic points is also increased. With the combination of the high-resolution camera, high-precision terrain data can be obtained. By the adoption of the method provided by the invention, noncontact, synchronous and high-precision measurement of the simulated seabed terrain can be realized, and corresponding problems existing in the prior art are solved.

The invention relates to the field of optoelectronics and display technology and can be used in high speed stereoscopic glasses when working with any type of 3D display, designed to operate with active stereo glasses with standard (60-160 Hz), high (hundreds of Hz) and ultrahigh (several kilohertz) frame rate. According to the invention in optical shutters of high-speed stereo glasses a layer of the helix-free ferroelectric liquid crystal (FLC) with optimized physical parameters is used. The technical result is an increase of the optical contrast of FLC shutters, reducing the amplitude of the control voltage.