14 results about "Shadow casting" patented technology

The invention discloses a real-time dynamic light and shadow rendering optimization method based on an unreal engine, and relates to the field of light and shadow rendering, and the method comprises the steps: firstly distributing shadow importance scores for all grid objects in a scene based on a camera view cone and AI context data, and carrying out the priority ranking of potential shadow projectors; and then, performance budget evaluation is carried out in combination with the current frame rate and the GPU load, and intelligent shadow projector selection and LOD application are carried out on the sorted shadow projection object list according to the performance budget evaluation. And finally, the optimized shadows to be rendered are sent to a light visual angle rendering and VSM page filling process in batches, and a movable light source optimization virtual schlieren is generated. According to the method, the unnecessary calculation overhead is remarkably reduced, so that the rendering efficiency and the frame rate stability are greatly improved while the high-quality dynamic light and shadow effect is ensured, and the core problem that the traditional performance and quality are difficult to balance is effectively solved.

An inspection method for inspecting the dimensions or geometric features of a mechanical component (4) using an optoelectronic system of the shadow projection type, said method comprising calculating spatial coordinates of points (pi) of the surface of said component, allowing a suitable 3D reconstruction of the surface of said component, and inspecting the dimensions or geometric features using such spatial coordinates. The spatial coordinates of the points are calculated starting from a two-dimensional image (5i) and an associated contour, which are obtained by the shadow projection system when the mechanical part is rotated about the axis of rotation (A). The position of a point or edge (Ejk) of the contour and a change in such position are detected at a specific height (zj) as the angle of rotation ([theta] i) changes. Based on such a change, the position of the component to be inspected, which generates the points of the contour, relative to the measurement plane is identified and the spatial coordinates of the points of the surface are calculated.

Method for illuminating an interior (2) of a motor vehicle (1), wherein a lighting state in the interior (2) results from ambient light, wherein the ambient light originates from at least one light source (12) located outside the motor vehicle (1) and enters the interior (2), the method comprising the following steps: - Determining at least one piece of shadow information (16) relating to a shadow cast by the ambient light, wherein the shadow cast occurs on at least one section of the motor vehicle (1) and / or on at least one object (26) located in the interior (2) or an environment (4) of the motor vehicle (1), - determining at least one item of change information (42) based on the at least one item of shadow information (16), wherein the at least one item of change information (42) relates to an expected temporal variability of an expected lighting state in the interior (2), wherein the expected temporal variability occurs due to the shadow and a relative movement between the at least one light source (12) and the motor vehicle (1) and / or the at least one object (26), - generating a temporally changing interior light by means of at least one lighting device (49) arranged in or on the interior (2) and based on the at least one item of change information (42) such that an actually occurring temporal variability of an actually occurring lighting state in the interior (2), which results from the ambient light and the interior light, is at least weaker than the expected temporal variability of the expected lighting state.

The utility model relates to the technical field of film detection, in particular to a film defect detection device. The device comprises a film viewing cavity arranged in a darkroom, the film viewing cavity comprises a main cavity defined by baffles and a middle platform layer arranged in the main cavity, a light through hole is formed in the middle platform layer, a xenon lamp is installed at the top of an upper cavity so that light can irradiate a to-be-detected film at the light through hole, and a defect imaging curtain is laid at the bottom of a lower cavity so that the to-be-detected film can be detected. The shadow left by the thin film at the light through hole is received; light penetrates through the thin film, shadow is projected on the defect imaging curtain laid at the bottom of the lower cavity, due to the fact that the xenon lamp with higher light penetrating power is selected, slight deformation type defects of the thin film can be seen on the defect imaging curtain, the defects of an existing thin film defect observation mode are overcome, and the tiny and slight deformation type defects of the thin film can be seen.

To improve the accuracy of light source position detection. [Solution] The light source position detection method includes illuminating the jig 10 with a light source Li such that the shadows 15 of each sphere 14 of the multiple protrusions 12 are projected onto the base 11; capturing multiple images of the jig 10 illuminated by the light source Li with multiple cameras C; calculating a first three-dimensional coordinate X1 of the center of the sphere 14 and a second three-dimensional coordinate X2 of the center of the shadow 15 of the sphere 14 for each of the multiple protrusions 12 based on the multiple images; calculating multiple light source vectors V for the multiple protrusions 12, wherein each of the multiple light source vectors V passes through the first three-dimensional coordinate X1 and the second three-dimensional coordinate X2 for each of the multiple protrusions 12; and calculating the position of the light source Li based on the multiple light source vectors V.

The invention relates to an illumination receiving system for receiving light projected by a shadow or reflected from an object in a textile machine. In order to reduce resource costs, improve system capabilities and make the system more slow against disturbances, a lighting receiving system is provided, comprising:-at least one receiving cavity; and-at least one photosensitive electronic component; wherein the receiving cavity is constructed and placed relative to the object such that light emitted from a light source and projecting a shadow from the object and / or reflected from the object enters the receiving cavity, and wherein the light entering the receiving cavity is transmitted to at least one photosensitive electronic component to measure incident illumination.

A method for checking dimensions and geometrical features of a mechanical part using an optoelectronic system of the shadow casting type includes calculating the spatial coordinates of points of the surface of the part that allow a 3D reconstruction of the surface of the part, and checking the dimensions and geometrical features making use of such spatial coordinates. The spatial coordinates of the points are calculated starting from two-dimensional images and relevant profiles obtained by means of the shadow casting system while the mechanical part rotates about a rotation axis. The position of points or edges of the profiles and variation of such position are detected at predetermined heights as the rotation angle varies. On the basis of such variation, the position, with respect to a measurement plane, of points on the part to be checked which generate points of the aforementioned profile is identified and the spatial coordinates of the points of the surface are calculated.

Methods and apparatuses for controlled shadow casting to increase perceived quality of projected content are disclosed. In some examples, an apparatus is for increasing perceived quality of content projected onto a projection surface. In some examples, the apparatus includes a shutter position determiner to determine a target shutter position of a shutter based on a position of a light source and a position of the projection surface. In some disclosed examples, the apparatus further includes a shutter controller to move the shutter to the target shutter position to cast a shadow onto the projection surface around a portion of the content projected onto the projection surface.

The application provides a vehicle 3D model light rendering method, system, electronic equipment and medium, and belongs to the technical field of vehicles. The method comprises the following steps: acquiring an aerial panoramic image collected by a surround-view camera; processing the aerial panoramic image to obtain a binary mask for marking a shadow area of a vehicle; performing main light source parameter estimation based on a vehicle 3D model, the aerial panoramic image and the binary mask to obtain a main light source parameter set; determining an ambient light parameter based on the aerial panoramic image and the binary mask; and performing 3D vehicle model rendering based on the main light source parameter set, the ambient light parameter, the vehicle 3D model and the aerial panoramic image. The application uses the shadow projected by the vehicle itself as an information source for light perception, realizes closed-loop light perception and can adapt to complex scenes. Through accurate light source direction calculation and full parameter estimation, the application provides a mathematical basis for generating correct shadow projection and mirror reflection effects, and significantly improves the realism of rendering.

The invention discloses an asymmetric illumination three-dimensional face reconstruction method and system based on a monocular camera, relates to the field of face image reconstruction, and completes initial estimation of a face by acquiring initial three-dimensional parameters and depth features of the face through an encoder and a regression network. And subsequently introducing a double-branch detail refining network to decouple and refine mutually coupled surface attributes and illumination information, and respectively outputting high-frequency geometric details, a refined albedo map and refined illumination parameters. In a final analysis-synthesis link, a rendering pipeline containing micro shadow projection is adopted. By explicitly simulating the process of generating the projection shadow by geometric shielding during rendering, the shadow can be correctly reproduced by the synthetic image. Therefore, the model can be guided to jump out of a local optimal trap, and precise separation and high-fidelity reconstruction of geometry, texture and asymmetric illumination are realized.

The embodiment of the invention discloses a roof photovoltaic intelligent arrangement method and system based on shadow analysis and region cutting. The method comprises the following steps: identifying a three-dimensional model of a building and a shelter; according to the geographic position and the sunlight parameters, performing three-dimensional shadow analysis by adopting a shadow projection algorithm to obtain a shadow area on the to-be-laid surface of the roof; identifying a roof contour and determining a to-be-laid area; geometric Boolean subtraction is carried out on the to-be-laid area and the shadow area, and an effective laying area is obtained through cutting; and automatically generating a photovoltaic panel arrangement scheme in the effective area according to preset parameters. According to the method, general accurate analysis of a flat roof and a pitched roof, automatic avoidance of a shadow region and full utilization of a laying area are realized, and the automation degree, accuracy and economical efficiency of photovoltaic arrangement design are remarkably improved. The problems of inaccurate arrangement, low efficiency and poor economical efficiency caused by the fact that three-dimensional shielding shadows on complex roofs cannot be accurately calculated and dependence on manual judgment in the prior art are solved.

A method of manufacturing an apparatus (12), the method comprising: forming a portion of an electronic circuit device and a shadow wall structure (13) above a substrate, and then depositing a conductive layer (5) on the substrate by depositing conductive material in at least a first deposition direction at an acute angle relative to the plane of the substrate. The shadow wall structure is arranged to cast a shadow during deposition to leave areas where conductive material is not deposited. The shadow wall structure includes one or more gaps (15), each gap being shorter than the shadow length of the corresponding portion of the shadow wall structure casting a shadow into the gap to prevent conductive material from forming in the gap and thereby forming electrically isolated areas of the upper conductive layer from each other. These are arranged to form conductive elements for applying signals to the electronic circuit device and / or receiving signals from the electronic circuit.

The application discloses a real-time dynamic light rendering optimization method based on Unreal Engine, and relates to the field of light rendering. Firstly, based on a camera view cone and AI context data, shadow importance scores are assigned to each mesh object in a scene, and potential shadow casters are prioritized. Then, performance budget evaluation is performed in combination with the current frame rate and GPU load, and intelligent shadow projector selection and LOD application are performed on the sorted shadow caster list accordingly. Finally, these optimized rendering shadow batches are sent to the light perspective rendering and VSM page filling processes to generate movable light source optimized virtual shadow. This method significantly reduces unnecessary computational overhead, thereby greatly improving rendering efficiency and frame rate stability while ensuring high-quality dynamic light effects, effectively solving the core problem of balancing traditional performance and quality.

The invention relates to an illumination projector for shadow projection from an object, in particular a yarn in a textile machine. The illumination projector comprises at least one light source, in particular a light emitting diode (LED). In order to reduce resource costs, improve system capabilities and make the system more slow against interference, an illumination projector is provided. The illumination projector includes at least one waveguide and the light source is positioned such that emitted light enters the waveguide and the waveguide is configured to be positioned relative to the object such that light exiting from the waveguide on an exit side of the waveguide projects a shadow from the object to a receiving side or such that light will be reflected from the object to the receiving side.