10 results about "Fish eye lens" patented technology

A detection device detects an imaged human from a captured image captured by a ceiling camera using a fish-eye lens, and includes a division part, an area estimation part, and a determination part. The division part divides the captured image into a plurality of areas. The area estimation part calculates a probability that each of the plurality of areas includes a position where a detection target estimated to be a human is present. The determination part determines whether the detection target is a human using the probability of each of the plurality of areas.

A multi-camera three-dimensional capturing and reconstruction system comprising: a mechanical structure (10); at least five cameras (11-15) are placed on said structure (10); characterised in that said at least five cameras (11-15) are cameras each using a fisheye optic; said at least five cameras (11-15) are configured so that, compared to a forward direction of said system: a first front camera (11) is directed with the options pointed at 0°±10°; a second front-right camera (12) is directed with the optics pointed at +45°±10°; a third front-left camera (13) is directed with the optics pointed at −45°±10°; a fourth rear-right camera (14) is directed with the optics pointed at 60°±20°; a fifth rear-left camera (15) is directed with the optics pointed at −60°±20°; x defines the distance between said second front-right camera (12) and said third front-left camera (13), the distance y between said third front-left camera (13) and said fifth rear-left camera (15) is equal to or greater than the distance x, with y being greater than or equal to 10 cm.

The application discloses a panoramic examination room splicing method with adaptive light compensation and distortion correction, aiming at solving the problems of transition light change caused by uneven light, splicing fault and deformation caused by wide-angle and fish-eye lens distortion in the existing examination room monitoring splicing. The method first constructs an anchor point system in the examination room, selects and calibrates multiple reference anchor points, the reference anchor points include mandatory anchor points and auxiliary anchor points, the mandatory anchor points are permanent feature points in the examination room, the auxiliary anchor points are relatively fixed feature points in the examination room, and meanwhile, the physical coordinates, standard brightness values and structural features of the reference anchor points are calibrated and an anchor point correlation network is constructed. Then, images are synchronously collected, matching anchor points are detected, adaptive light compensation and distortion correction are carried out based on the reference anchor points, finally, the images are spliced according to the reference anchor point coordinates, and the anchor point failure effect and dynamic updating mechanism are also included. The application realizes seamless panoramic splicing of the examination room, and improves the monitoring continuity and AI analysis convenience.

The utility model relates to a 3D fisheye lens and camera and video camera applying the same, the 3D fisheye lens comprises a first lens group G1 with positive diopter, an aperture stop and a second lens group G2 with positive diopter from an object side to an image plane side in sequence, the first lens group G1 is divided into two parts, the object side is a front part G1a with negative diopter, the image plane side is a rear part G1b with positive diopter, and the second lens group G2 is a rear part G1b with negative diopter. Wherein the G1a of the front part is composed of three continuous negative lenses, and the G1b of the rear part is a biconvex double-sided aspheric surface. The fisheye lens provided by the utility model has the advantages of miniaturization, high performance, large image field, a field angle of more than 200 degrees, enough gentle curvature radius of the first glass, enough small mutual shielding, enough small effective aperture, and capability of simulating the visual effect of eyes.

An image capture device includes a camera that captures video frames of a scene surrounding the camera. The image capture device further includes a lens attachment that directs light rays from the lens of the camera across a wider field of view than the lens of the camera. The image capture device further includes a housing that removably couples the lens attachment to the camera. The image capture device further includes a processor communicatively coupled to the camera. The processor receives a video frame captured by the camera through the lens attachment and generates a two-dimensional projection of the video frame by mapping pixels of the video frame from the three-dimensional coordinate space to a two-dimensional coordinate space.

The application discloses an ultra-high-definition large-target-fish-eye lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the direction of the optical axis from the object side to the image side. The lens adopts a ten-piece design, and a fish-eye lens with a focal length of 2.9mm is realized. The total optical length is controlled within 30.3mm, the maximum outer diameter of the lens is less than 24.5mm, the maximum field of view of the lens can reach 198°, the relative luminance of the full field of view is greater than 67%, and the field of view utilization rate is high. The off-axis chromatic aberration value of the lens is less than 3um, the color difference restoration degree of the image is high, and the purple edge can be effectively inhibited.

The application provides a kind of forest belt layering leaf area density measuring device and method based on unmanned aerial vehicle, belongs to the technical field of forestry and ecology, device includes: unmanned aerial vehicle, camera holder, motion camera and fish eye lens;The upper surface of unmanned aerial vehicle is fixedly connected with camera holder, motion camera is fixedly connected on camera holder, fish eye lens is fixedly installed on motion camera, adjust camera holder so that fish eye lens is vertically upward, wireless control device is connected with the control system of unmanned aerial vehicle and the control system of motion camera;The application can flexibly, efficiently, non-destructive measure forest belt layering leaf area density, provide important parameters for farmland shelter forest aerodynamics research, and provide basis for scientific construction and management of farmland shelter forest.

The application relates to the field of machine vision, and proposes a fish-eye lens external parameter calibration method for calibrating the external parameters of multiple fish-eye lenses installed on a vehicle body, wherein the multiple fish-eye lenses are arranged at the front, rear, left and right parts of the vehicle body, and the method comprises the following steps: determining the conversion relationship among multiple fish-eye lens coordinate systems according to images of multiple checkerboard calibration boards captured by the multiple fish-eye lenses; the multiple checkerboard calibration boards are placed horizontally on the ground in the left front, left rear, right front and right rear directions of the vehicle body; determining the external parameters of each fish-eye lens in the multiple fish-eye lenses according to the conversion relationship among the multiple fish-eye lens coordinate systems and the images of first and second wheel targets in the multiple fish-eye lenses; the first and second wheel targets are placed horizontally on the left and right sides of the rear wheels of the vehicle body respectively.

The application discloses a compressive correlation imaging method and system with large field of view imaging capability, and belongs to the technical field of space active imaging. The method uses a fisheye lens 13 and a CCD camera 14 to perform fast large field of view imaging on an imaging area, and obtains a large field of view imaging result Fig; N existing regions {A1, A2,..., A i ,…,A N} of the measured objects are determined according to the imaging result Fig; compressive correlation imaging is performed in the regions {A1, A2,..., A i ,…,A N}, and N imaging results {fig1, fig2,..., fig i ,…,fig N} are obtained. The application has the beneficial effects that: (1) the whole to-be-measured region is coarsely imaged by using large field of view imaging, compressive correlation imaging is performed only on the regions where the objects exist, the imaging time can be shortened, the imaging efficiency is improved, and the imaging region is not repeatedly scanned or missed; (2) the signal-to-noise ratio of echo signals is improved, and the detection distance is improved; and (3) the staring imaging time can be shortened by using a compressive correlation imaging reconstruction algorithm, and the imaging efficiency is improved.

The application discloses a kind of semi-automatic fish eye lens calibration method and system. Including: obtaining multiple calibration images by fish eye camera, calibration image includes N group orthogonal parallel straight line pair;Curve extraction is carried out to calibration image by pre-trained neural network;Based on the calibration image after curve extraction, select 2 orthogonal parallel straight line pairs;The orthogonal vanishing point of orthogonal parallel straight line is calculated, and the main line equation is obtained;Based on main line equation, calculate main point position;Select sampling point, obtain corrected image point according to calibration model and main point position, establish error function by image point and to-be-optimized focal length and distortion coefficient, optimize to-be-optimized curve by minimizing global error function, obtain optimized focal length and distortion coefficient.The application forms a kind of semi-automatic fish eye lens calibration system without calibration board by adjusting the internal parameter of fish eye camera, so that fish eye camera has fast and accurate calibration capability.