42 results about "Shadow casting" patented technology

A vision system is provided to determine a positional relationship between a semiconductor wafer on a platen and an element on a processing machine, such as a printing screen, on a remote side of the semiconductor wafer from the platen. A source directs ultraviolet light through an aperture in the platen to illuminate the semiconductor wafer and cast a shadow onto the element adjacent an edge of the semiconductor wafer. A video camera produces an image using light received from the platen aperture, wherein some of that received light was reflected by the wafer. The edge of the semiconductor wafer in the image is well defined by a dark / light transition.

When planning and setting up wind power installations, the visual detractions to be expected on the part of the wind power installation on the environment play an increasingly important part in approval and acceptance. The shadow casting caused by the wind power installation on the adjoining properties is often perceived by the residents as being very troublesome.A wind power installation is provided by means of which shadow casting regulation is improved. That is achieved by a method of operating a wind power installation wherein a first light intensity is detected in a region of direct light irradiation and a second light intensity is detected in a shadowed region, and wherein the wind power installation is shut down if the difference between the first light intensity and the second light intensity is greater than a predetermined value.

The present invention provides an improved system and method for rendering shadows in a computer graphics system. Textures representing the area of influence resulting from a combination of light sources and shadow casters are pre-computed. Scenes are then rendered using the pre-computed textures. A first step entails generating sets of directions and associated pre-computed textures for each light source and shadow caster pair in a simulation frame. Next, a first scene in the simulation is rendered. During this step one or more of the pre-computed textures are used to darken the area of influence or shadow portion of the scene.

A device for detecting an incident light distribution. The device has an array of light sensors, and a shadow casting element spaced above the light sensor array, with the shadow casting element between the incident light to be modeled and the sensor array. A processor interprets a cast shadow detected by the light sensor array thereby to derive information relating to the directional distribution of the incident light.

The light unit includes a lens, shadow-forming surface, and a shadow casting surface. Outside light entering the light unit is at least partially blocked by the shadow casting surface so as to cast a shadow on the shadow-forming surface. The shadow casting surface may be embedded within or on a surface of the lens or otherwise supported above the shadow forming surface. The shadow casting design is preferably spaced from the shadow-forming surface.

A rotor of a wind turbine may cast an intermittent shadow onto an object in the vicinity of the turbine. A shadow-control system stops the wind turbine, based on a shadow-related shut-down condition. The condition is based on a result of a comparison between a direct-light intensity and an indirect-light intensity being beyond a direct-to-indirect light threshold. A set of light sensors measures the direct- and indirect-light intensities. A sensor measures the direct light intensity when irradiated by the sun, and the indirect-light intensity when not irradiated by the sun. The set of light sensors to provide the measured direct- and indirect-light intensities for the comparison consists of two sensors, an eastward-oriented sensor and a westward-oriented sensor.

The present invention relates to systems for protecting against sun's damaging rays, and against unwanted onlookers like drones. The systems comprise a drone and a covering member attached to the drone. In one aspect, a Flight Control System, FCS, flies the drone in a selected spot. In one embodiment, the covering member acts like an overhead covering, and a measuring device provides the FCS information for flying the drone on a holding position over a stationary user. In another embodiment, a measuring device enables the FCS to fly the drone over a non-stationary user and to tracking him. Further, the FCS adjusts the drone position with respect to the position of either the sun or a detected drone in the sky. In another embodiment, a radio control, transmitter receiver, pair is used to communicate user's requests to the FCS. One request may be to turn on the motors.

The invention belongs to the producing area, which uses modern shadow casting technique and computer image processing technique to process the illumination solidification modeling on the surface of liquid photosensitive resin to form the three-dimensional solid quickly. The invention processes the sectional mould data of three-dimensional solid via the computer fast shaping processing technique to generate the digital grid image data which can be directly used in projection, to be transformed into digital optical signal via the digital image projector, and adjusted by different time and space patterns to be irradiated over the surface of photosensitive resin to solidify it.

A method for aligning optical layers of a multi-layer display includes displaying a dark screen image on each of a plurality of transmissive pixel arrays separated from each other by spacing regions. The transmissive pixel arrays are disposed on a display layer of the multi-layer display. The display layer is illuminated with a plurality of illumination sources of an illumination layer disposed behind the display layer. Each of the illumination sources corresponds to one of the transmissive pixel arrays to illuminate the corresponding one of the transmissive pixel arrays. An illumination pattern is cast onto a screen layer disposed in front of the display layer. The illumination pattern includes bright regions due to overlapping illumination cast from adjacent ones of the transmissive pixel arrays. The bright regions of the illumination pattern cast onto the screen layer are analyzed to identify misalignments between the display layer and the illumination layer.

An exemplary street lamp for being stalled on the ground includes a light source, a light pervious member and a direction indicator. The light pervious member includes a light incident surface and an opposite light emitting surface for facing the ground. The light source is arranged opposite to the light incident surface. The direction indicator is arranged on the light pervious member for projecting the shadow thereof on the ground to indication a direction at the geographic location of the street lamp.

When planning and setting up wind power installations, the visual detractions to be expected on the part of the wind power installation on the environment play an increasingly important part in approval and acceptance. The shadow casting caused by the wind power installation on the adjoining properties is often perceived by the residents as being very troublesome.A wind power installation is provided by means of which shadow casting regulation is improved. That is achieved by a method of operating a wind power installation wherein a first light intensity is detected in a region of direct light irradiation and a second light intensity is detected in a shadowed region, and wherein the wind power installation is shut down if the difference between the first light intensity and the second light intensity is greater than a predetermined value.

An object-finder-mounting apparatus comprises: a base for mounting the object-finder-mounting apparatus to an optical instrument; an object-finder-holder assembly coupled to the base and comprising one or more object-finder holders for removably holding an object finder; a projection plate moveably coupled to the base and / or the object-finder-holder assembly for movement between first and second positions; and a shadow-casting member. The object-finder-mounting apparatus is convertible between first and second working modes. In the first working mode, the projection plate is moved to the first position which permits use of the object finder held by the object-finder holders to locate objects. In the second working mode, the object finder is removed from the object-finder holders and the projection plate is moved to the second position. In the second working mode, the shadow-casting member casts a shadow onto the projection plate when the optical instrument is directed toward a luminous object.

For page data containing shadow-casting objects, trap graphics are generated according to the following procedure. First, an ID drawing process is performed for all objects within a page, and based on the process result, a related graphic list indicating relative positional relationships between the objects is generated. Thereafter, an ID drawing process is performed for all objects in the area of each shadow-casting object, excluding the shadow-casting object. The result of the ID drawing process in the shadow-casting object area is reflected in the related graphic list, and thereafter, trap graphics are generated based on settings information in the related graphic list.

One or more embodiments of this specification provide a transport device for hollow brick production. By setting a partition bar and a partition plate on the belt body of the first conveying mechanism, and setting a detection part at one end of the belt body, it is possible to accurately transport the hollow bricks to the detection part. The number and speed of the hollow bricks in the center are limited. By setting the base and bridge frame in the detection part, a number of photosensitive switches are installed on the inner top of the bridge, and a number of light sources are installed on the base. The light source can illuminate the hollow bricks and cast shadows on the bridge frame. The top of the internal test, the measurement result of the photosensitive switch reflects whether the light is blocked by the object. By setting the control part, the integrity and porosity of the hollow brick can be measured according to the measurement result of the photosensitive switch to judge whether the hollow brick is qualified. And by setting The conveyor chain and push rod can transport the qualified hollow bricks and unqualified hollow bricks to the second conveying mechanism and the third conveying mechanism respectively, realizing the integration of transportation, testing and sorting, saving manpower and material resources, and improving work efficiency.

The subject matter discloses a method of determining whether a point in a computerized image is visible from a viewpoint; said image is represented as a point cloud, the method comprising: performing inversion on a the vicinity of the point thus creating a computerized inversed objects each point in the vicinity of the point is related to a parallel point in the computerized inversed object and obtaining a convex hull of the inversed object; the point is likely to be visible from the viewpoint in case it belongs to the point set composing the convex hull. The method is also useful for shadow casting and for determining the location of an image-capturing device within a volume

The invention discloses a shadow processing method and a shadow processing device for a virtual three-dimensional model, and an electronic device. The method comprises the steps that shadow projection textures are obtained, and the shadow projection textures are projection shadows generated by utilizing a virtual light source in a game scene to irradiate a first virtual three-dimensional model in a target area; the shadow projection textures are set to be a projection shadow generated by a second virtual three-dimensional model in the target area under irradiation of the virtual light source, the second virtual three-dimensional model and the first virtual three-dimensional model are the same in shape, and the number of patches of the second virtual three-dimensional model is smaller than that of patches of the first virtual three-dimensional model. According to the invention, the technical problem of low shadow precision of a plant model with a low patch number in the prior art is solved.