120 results about "Viewing cone" patented technology

An autostereoscopic display device has both a barrier arrangement and a lens arrangement. A plurality of views are provided to different lateral viewing directions. At least a portion of the field of view has autostereoscopic output, and the portion having autostereoscopic output has no repetition of individual 2D views and comprises at least three individual 2D views. This means there is no reversal of the stereo views (“pseudo stereo views”) at viewing cone boundaries as there are no viewing cone boundaries.

This invention relates to reflective cholesteric displays without using Bragg reflection. The helical pitch of the cholesteric liquid crystals may or may not be tuned in a visible wavelength, but its Bragg reflection will never be displayed. An elliptical polarizer with properly designed retardation and lamination positioned at the front of the display will be able to eliminate the Bragg reflection over a large viewing cone. The function of the display cell structure is merely a light shutter to switch the incident light ON and OFF. In the black-and-white display mode, the white state is achieved from the metal reflection in the cholesteric planar texture area; and the black state is obtained by cholesteric's depolarization effect and polarizer's filtration effect in the cholesteric focal conic texture area. In the full color mode, the full color state is created by the metal reflector and the micro-color filter in the cholesteric planar texture area; and the black state is realized in the cholesteric focal conic texture area. The reflective cholesteric display, remaining its long-term bistability but not applying the narrow-band Bragg reflection, initiates novel displays with a neutral wide-band reflection.

The invention discloses a method for mass model data dynamic scheduling and real-time asynchronous loading under virtual reality. The method includes the following steps of firstly, preprocessing 3D model scene data, secondly, cutting and partitioning a whole model scene, thirdly, conducting multithreading parallel distribution loading and fourthly, clipping a view cone. Based on a view cone clipping algorithm for acquiring the point of intersection of the view cone and a topographic region, real-time clipping based on the topographic region in dynamic scheduling is achieved, by the adoption of a multithreading processing mechanism of a model data partitioning scheduling and rending pipeline, a dynamic scheduling and drawing pipeline and a data processing scheduling pipeline between different mediums can be asynchronously loaded, and therefore dynamic balance of loading and performance efficiency of the mass scene model data is achieved in the hardware environment with a limited memory, a limited processor and the like.

The invention relates to a three-dimensional target detection method and system based on point cloud weighted channel characteristics, and the method comprises the steps: carrying out the extraction of a target in a two-dimensional image through a pre-trained deep convolutional neural network, and obtaining a plurality of target objects; based on each target object, determining a point cloud viewcone in the corresponding three-dimensional point cloud space; segmenting the point cloud in the view cone based on a segmentation network of the point cloud to obtain an interested point cloud; And based on the network with the weighted channel characteristics, performing 3D Box parameter estimation on the point cloud of interest to obtain 3D Box parameters, and performing three-dimensional target detection. According to the method, the characteristics of the image can be learned more accurately through the deep convolutional neural network. Based on a network with weighted channel characteristics, 3D Box parameter estimation is carried out on the point cloud of interest, the weight of characteristic drop of unimportant points can be reduced, the weight of key points can be increased, interference points can be restrained, the key points can be enhanced, and therefore the precision of 3D Box parameters can be improved.

A liquid crystal display (LCD) includes an LCD panel, an orienting base, an imaging unit, an image processing unit, and a control unit. The LCD panel is configured for displaying information readable from any vantage point inside the viewing cone thereof. The orienting base is configured for supporting and orienting the LCD panel. The imaging unit is configured for capturing an image of an immediate area in front of the LCD panel. The image processing unit is configured for processing the captured images to detect whether the eyes of the viewer are within the immediate area but are outside the viewing cone of the LCD panel, and, if yes, to locate the eyes of the viewer. The control unit is configured for controlling the orienting base to orient the LCD panel to aim the viewing cone of the LCD panel to include the located eyes of the viewer.

A film construction (320) includes a broad band reflective polarizing film (312) that may be immersed in an ultra low refractive index medium (322, 324). The reflecting polarizing film is characterized by a pass axis and a block axis, and its reflectivity for white light of the pass state polarization increases with increasing incidence angle to provide a compressed or narrowed viewing cone in one or two planes.

Systems and methods for electronically controlling the viewing angle of a display using liquid crystal optical elements are provided. Each liquid crystal optical element may be associated with a respective scattering module and may selectively steer a device generated light beam to one of two or more scattering regions of its associated scattering module. When a scattering region receives a steered light beam, the steered light beam may be scattered into a viewing cone having at least one viewing angle defined by a characteristic of that scatter region. Each liquid crystal optical element may be made from one or more suitable liquid crystal materials that can be controlled electronically to vary the effective index of refraction of one or more different regions of the liquid crystal optical element, thereby steering incoming light towards a particular one of two or more scattering regions of an associated scattering module.

A display processing system for providing video signals for displaying an image is provided. The display processing system comprises input channels for receiving a plurality of component images, each component image being a portion of the complete image for display, the image data of each component image being defined by a view frustum having a clipping plane, and a combiner for combining the image data of the component images. According to the present invention, at least two clipping planes of two of the view frustums are non-coplanar. Such display processing system corrects for the defect of driving angular resolution to the edges of the field of view of a display system, in particular for large field-of-view display systems, and balances the overall system angular resolution by allowing each image generator channel to render to an optimal view frustum for its portion of the complete image.

An optical system that reduces reflections from an electronic display is provided herein. The optical system may include an electronic display; and a light directing medium configured to steer a plurality of viewing cones into an eye motion box facing said display so that said viewing cones overlap at least partially at the eye motion box plane, wherein a viewing cone is a geometric location only within which a viewer can see light coming from said electronic display.

A liquid crystal display is provided which comprises a front panel comprising a front alignment layer having an alignment direction, a rear panel comprising a rear alignment layer having an alignment direction, and a liquid crystal layer between the front and rear alignment layers. The liquid crystal layer has a rotational twist angle of about 90° and a pre-tilt angle of not more then 2°. The alignment, material and thickness of the liquid crystal layer are such that at the mid-point of the rotational twist, the direction of liquid crystal directors coincide with an off-normal viewing direction of the liquid crystal display.

The embodiment of the invention provides a bimodal bionic vision sensor with a view cone and a view rod. The sensor comprises a first preset number of voltage mode active pixel sensor circuits and a second preset number of current mode active pixel sensor circuits, wherein each voltage mode active pixel sensor circuit comprises a first type photosensitive device, and each current mode active pixelsensor circuit comprises a second type photosensitive device. Through the voltage mode active pixel sensor, the target voltage signal representing the light intensity information in the target lightsignal can be output, the precision of representing the light intensity information by the obtained target voltage signal is higher, and an image with higher quality can be obtained, that is, the image has a higher image signal-to-noise ratio. Through the current mode active pixel sensor, a specified digital signal representing light intensity gradient information in a target light signal can be output, the performance indexes such as an image dynamic range and a shooting speed of the bionic vision sensor are ensured, and the stability and robustness of the bionic vision sensor are stronger.

The invention relates to a multichannel LED dome screen geometric correction method. The method comprises the following steps: step 1, obtaining a frame buffer texture image A of an RTT camera S1; step 2, acquiring a frame buffer texture image B of the camera in the step 2; step 3, defining a front-view matrix camera as S3; defining S3 projection matrix as a front view matrix, the window size being full screen size, defining a S3 view matrix as a unit matrix, adding a quadrilateral plane model to a front view matrix camera node, pasting the texture cache image B on the quadrilateral plane model, performing point extraction operation on the image B by adopting shader language programming, and finally outputting a display image C. According to the invention, a traditional projector projection screen is replaced by the multi-channel LED dome screen, so that the brightness and resolution uniformity of the whole picture are consistent; geometric correction is carried out through shader language programming to realize spatial transformation from a view cone plane point to a dome screen point, spatial restoration correction of the image is rapidly realized, the delay characteristic can bebasically ignored, and the stability is high.

A method and a system for calibrating a camera in a surveillance system. The method and system use a mathematical rotation between a first coordinate system and a second coordinate system in order to calibrate a camera with a map of an area. In some embodiments, the calibration can be used to control the camera and/or to display a view cone on the map.

An apparatus for recognizing a pupillary distance for three-dimensional (3D) display includes a display configured to output a 3D image corresponding to a reference pupillary distance, a controller configured to control a viewing cone included in the 3D image, and a user inputter configured to receive a user feedback indicating whether an artifact is viewed in the 3D image in response to the controlling of the viewing cone. The controller may move the viewing cone within a margin corresponding to the reference pupillary distance, and change the reference pupillary distance or determine the reference pupillary distance to be a desired pupillary distance of the user based on the user feedback.

The invention provides a light field display device, relates to the technical field of display, and aims to solve the problem of visual fatigue caused by inconsistent monocular focusing depth and binocular convergence depth and prevent a user from feeling dizzy. The light field display device comprises a display screen and a lens unit arranged on the light emitting side of the display screen, wherein the lens unit comprises a plurality of lenses arranged in an array; the display screen is arranged on the focal planes of the plurality of lenses; the display screen comprises a first substrate and a second substrate which are oppositely combined, wherein the first substrate is a light emitting side substrate, the second substrate comprises a plurality of pixel islands arranged in an array, and each pixel island comprises at least one sub-pixel; the plurality of pixel islands correspond to the plurality of lenses; light rays emitted by sub-pixels of the pixel island are transmitted to a view area formed by human eyes through the corresponding lenses to be smaller than or equal to a half pupil area, and light rays, emitted by different sub-pixels in the pixel island, of different viewpoints are emitted into different view cone cells through the lenses. The invention is suitable for manufacturing the light field display device.

The invention relates to a normal-based large-scale point cloud visualization method, and the method comprises the steps: S1, constructing a node point cloud balanced octree structure according to a space structure of point cloud data; S2, constructing an octree structure with normal information according to the balanced octree structure and the normal information of the point cloud, and constructing normal LOD visual nodes in a down-sampling mode; and S3, finally, determining a node scheduling strategy according to the normal relationship between the view point and the view cone and the rendering node, and respectively calling a reading thread and a rendering thread for simultaneous reading and rendering according to the current scheduling strategy. According to the method, the rendering nodes are constrained by adding the normal information, the problem of invalid rendering of a large number of shielded point clouds, scene back point clouds and the like in a large-scale point cloud rendering process is solved, the number of points of actual rendering point clouds is reduced, and the authenticity of point cloud display is ensured.

The invention provides a three-dimensional video fusion method and system based on WebGL. According to the invention, there is no need to process a video source, and the method comprises the steps: accessing an HTTP video stream, updating a video texture object based on WebGL, updating and setting a near cutting surface, a far cutting surface and a camera position and orientation of a view cone ofan observation camera, then updating the scene depth of an observation view angle, projecting and restoring to an observer camera coordinate system, fusing with the live-action model, performing distortion correction on the camera, and finally realizing a video area cutting effect by adopting masking. The problems in the prior art are solved, three-dimensional video fusion is achieved on the basis of WebGL, the projection area is cut, adjacent videos can be prevented from being displayed in an overlapped mode, distortion correction is conducted on the cameras, and therefore the good display effect can be achieved for the cameras with large distortion and the situation that the installation positions are low.

The invention relates to a visualization method and device for a photogrammetry model in an unreal engine, and computer equipment. The method comprises the following steps: acquiring OSGB data of a photogrammetry model, converting the OSGB data into Uasset format data in an unreal engine, reconstructing a virtual quadtree, and then performing binary coding on nodes in the reconstructed quadtree; in a current frame, realizing tile hierarchical loading, cutting through a view cone, screening tile hierarchies for a tile tree in a view field range through a threshold value, judging a set membership between a current node and a node requested to be loaded in a previous frame through binary coding, and loading the current node; and asynchronously loading or unloading the request data nodes having the father-son-child-father relationship with the current node in the request data node set according to a preset rule. Visualization of the photogrammetry model is achieved in the unreal engine, the real-time visualization fluency of the oblique photography model can be improved, and memory use is reduced.