62 results about "Environmental lighting" patented technology

The invention discloses an on-line sequential extreme learning machine-based incremental human behavior recognition method. According to the method, a human body can be captured by a video camera on the basis of an activity range of everyone. The method comprises the following steps of: (1) extracting a spatio-temporal interest point in a video by adopting a third-dimensional (3D) Harris corner point detector; (2) calculating a descriptor of the detected spatio-temporal interest point by utilizing a 3D SIFT descriptor; (3) generating a video dictionary by adopting a K-means clustering algorithm, and establishing a bag-of-words model of a video image; (4) training an on-line sequential extreme learning machine classifier by using the obtained bag-of-words model of the video image; and (5) performing human behavior recognition by utilizing the on-line sequential extreme learning machine classifier, and performing on-line learning. According to the method, an accurate human behavior recognition result can be obtained within a short training time under the condition of a few training samples, and the method is insensitive to environmental scenario changes, environmental lighting changes, detection object changes and human form changes to a certain extent.

The invention discloses a consistent lighting method under a falsehood-reality fused environment, comprising the following steps: shooting a high dynamic range image reflecting a real environment, of a small mirror-surface sphere in a real scene, and acquiring an environmental lighting map of the real scene; preprocessing the environmental lighting map of the real scene and surface reflection attributes of a virtual object; preprocessing the environmental lighting of the real scene to generate environment lighting on a unit small sphere under local coordinates corresponding to all normal vectors to obtain Haar wavelet coefficients of the environment lighting; preprocessing a bidirectional reflection distribution function to generate slices of the bidirectional reflection distribution function on the unit hemisphere under all sight directions to obtain Haar wavelet coefficients of the slices; and drawing a falsehood-reality fused environment, indexing the wavelet coefficients of the environment lighting and the slices of the bidirectional reflection distribution function according to a normal vector of an apex of the virtual object and the sight directions, calculating a vector product of the coefficients to obtain an apex drawing color, and meanwhile, accelerating by adopting GPU (Graphics Processing Unit). The consistent lighting method can be used for efficiently realizing afull-range environment lighting drawing effect under the falsehood-reality fused environment.

The invention relates to a visual optical anti-counterfeiting film used for certificate surface, belonging to the public safety precaution and identification technical field. The optical anti-counterfeiting film can be widely applied to anti-counterfeiting and identification of identity certificates such as identity card, passport, police identification card, press card, certificate of lawyer, admission card for event and the like. The invention is characterized in that the optical anti-counterfeiting film is composed of a base layer, an information layer, a metal or metal compound layer and an embedding protective layer at least which are sequentially arranged from the top to bottom, wherein the interior of the base layer is embedded with multiple space frequency composite modulation microstructure stripe. Compared with the prior art, the invention has the following advantages: spatial use ratio is high, diffraction image without mutual interference can be seen at different angles in the same region; image vision angle width reappears in reflected light direction, colour saturation is high, influence of environmental lighting source is less; the reflected light direction can be light discoloration produced by the way that light continuation is simultaneously taken place on more than three broken colours; the restored true colour combined by RGB three colours can be reproduced in the reflected light direction; dynamic diffraction image can be reproduced by virtue of edge lighting light. The invention can be widely applied to visual anti-counterfeiting identification of identity certificates of resident identity card, passport, police identification card, press card, certificate of lawyer, teacher certificate.

The invention relates to a system and method for adjusting the color of image objects based on chained reference points and/or light gradients to account for the effects of lighting conditions that can vary across different environments, according to an implementation of the invention. To chain reference points and/or characterize light gradients, the system may determine a color shift value, which represents the effects of lighting conditions of a target environment (in which the lighting conditions may be unknown) relative to a reference environment (in which the lighting conditions may be known). The chained reference points, gradient characterization, color shift values, and/or other information may be used to store a delta map that characterizes the lighting conditions of an environment so that it may be reused for subsequent color shifts without re-characterizing the environment.

A directional illumination apparatus comprises an array of micro-LEDs that may be organic LEDs (OLEDs) or inorganic LEDs and an aligned solid catadioptric micro-optic array arranged to provide a water vapour and oxygen barrier for the micro-LEDs as well as reduced sensitivity to thermal and pressure variations. The shape of the interfaces of the solid catadioptric micro-optic array is arranged to provide total internal reflection for light from the aligned micro-LEDs using known transparent materials. A thin and efficient illumination apparatus may be used for collimated illumination in environmental lighting, display backlighting or direct display.

The invention provides a three coding period gray scale trapezoid phase shift structured light three dimensional information obtaining method. According to the method, three different coding periods are selected; an advantage of continuous dividing of a projection angle in a phase coding method is preserved and simultaneously, third coding period doubling is expanded for a measuring range of the phase coding method. And for a same coding period, three coding patterns that are moved by a one-third period are projected; therefore, anti-interference capability is improved; and meanwhile, influences of environmental illumination and inconsistency of surface reflection coefficients of a tested object on an obtained result of three dimensional information can be reduced. According to the invention, a phase shift coding structured light measuring range is improved; and a measuring error is reduced and measuring precision is improved; besides, influences of inconsistency of surface reflection coefficients of a tested object and environmental lighting on measurement can be eliminated.

The invention discloses a projection display color reproduction method under normal lighting environment, which comprises three parts, namely projection display color reproduction characterization, equivalent reproduction target color value determination, and equivalent reproduction of color. The projection display color reproduction characterization is used for analyzing and describing color characteristics of a projector camera system, a display surface and environmental lighting; the equivalent reproduction target color value determination is used for analyzing and determining the reproduction capacity of the whole system under the current display environment, and obtaining a target color value in the reproduction capacity range and equivalent with the input original image color according to the reproduction capacity; and the equivalent reproduction of color is used for processing the target color value and obtaining an input color value required by the reproduction target color value according to the input/output color conversion relationship. The method does not depend on the measurement of other physical equipment, has low calculation cost and is favorable for developing the projection display to the portable and flexible mobile application direction.

The invention relates to a method for adjusting the light of a semiconductor lamp by adopting a self-adaptive pulse-width modulation technology and a lamp. The method adopts optimal control of time, people and vehicle flow rate and environmental lighting degree and outputs pulse-width modulation signals from a self-adaptive pulse-width modulation end to control the lighting intensity of a lighting element so as to achieve the optimal match of the actual lighting degree. The lamp consists of a lamp body assembly, a bracket, the lighting element, a transparent lampshade and a lamp circuit assembly. The bracket is fixed in the lamp body assembly, the lighting element is arranged on the bracket, the lamp circuit assembly is arranged in the lamp body assembly and the transparent lampshade is arranged on the lamp body assembly. The lighting element consists of a semiconductor high brightness LED, a radiator and a temperature sensor. The lamp circuit assembly consists of a power supply module, a power supply switch-protection module, a power control module, a lighting module, a computer module U6, a sensor module, a clock module and a wireless date transmission module U5.

The invention discloses a DMD-based imaging pre-processing device and a DMD-based pre-imaging processing method. The DMD-based pre-imaging processing device comprises a CCD, a first lens group, a DMD, a second lens group, a DSP and an object space working surface. Spatial one-to-one correspondence between micro mirror-image elements in the DMD and CCD pixels is realized, and coordinate corresponding relation imaging of the CCD and the DMD and corresponding relation imaging of the DMD and the object space working surface are performed, and therefore, the pre-imaging processing device can process incident light before imaging. According to the DMD-based imaging pre-processing device and method of the invention, the focus of the work of image processing is shifted from post-imaging to an optical path of pre-imaging; and corresponding imaging of the CCD and the DMD is utilized, such that the gray range index of an imaging gray histogram can be increased, and therefore, the dynamic range of an imaging system can be expanded. With the DMD-based imaging pre-processing device and method of invention adopted, defects in environmental lighting and a field of view can be eliminated, and imaging quality and visual expressivity of an object can be improved. The DMD-based imaging pre-processing device and method of the invention can be widely applied in fields such as industrial inspection, medical imaging and astronomical observation.

The invention discloses a method for improving color rendering index and color temperature of a low-color-temperature cold white light emitting diode (LED) matrix light source. Red LEDs are matched in a cold white LED matrix light source for compensation; and the number of the matched red LEDs is 0 to 15 percent of the total number of the LEDs; or green LEDs in an amount which is 0 to 5 percent based on the total number of the LEDs are matched in an assisting mode. In the method, the LED matrix light source plays a role in high lighting effect of a low-color-temperature cold white LED in application, the overall color rendering index of the matrix is improved, the color temperature of the light source is adjusted, energy conservation, low carbon and emission reduction are achieved, a better environmental lighting and color rendering effect is achieved, and the environmental lighting comfort degree is improved.

A switchable directional illumination apparatus comprises first and second arrays of LEDs, some of which are micro-LEDs; an aligned catadioptric micro-optic array and an aligned light guide array. In a first mode a narrow angular output is provided by a first micro-LED array and catadioptric micro-optics. In a second mode a wider angular output is provided by the second LED array and light guides. A thin and efficient illumination apparatus may be used for switching illumination in environmental lighting, display backlighting or direct display.

The invention relates to the technical field of optical measurement and in particular relates to a lighting environment measurement method based on image analysis aiming at the influence of a lighting system on the environment. The method comprises the steps of imaging a standard reflecting plate, which is system-calibrated and coated with a standard color zone, by use of a color imaging device, and performing processing and analysis on the image information of the standard reflecting plate acquired by the imaging device by use of a computer connected with the color imaging device and a system analyzing and processing platform mounted in the computer, and consequently, obtaining the illuminance, the uniformity ofilluminance, the color temperature and the color rendering index of the environment of the standard reflecting plate. The lighting environment measurement method based on image analysis is capable of simplifying the field evaluation process during an environmental lighting test, and also capable of performing multi-point continuous testing on the lighting effect and performing long-time remote monitoring on the lighting effect.

A visual positioning system for mobile devices includes at least one infrared camera, at least one infrared illumination source, and a processor that coordinates operation of the at least one camera and illumination sources. A flood IR infrared illumination source illuminates environmental objects for localization of the mobile device during a first camera exposure window, and a structured IR illumination source illuminate environmental objects for detection and mapping of obstacles during a second camera exposure window. A visual SLAM map is constructed with images obtained from a first camera, with a single map being useable for positioning and navigation across a variety of environmental lighting conditions. A method for training a robot includes receiving operator input signals configured to start and stop recording of defined routes during the guiding of the mobile robot along paths between different pairs of desired robot destinations, such that routes for subsequent use by the robot are generated for paths imaged while recording is active.

A photography lighting system operative to impart patterns of complimentary colors that mimic the ambient light of natural surroundings creating a faithful rendering of the subject. The patterns include sinusoidal (sine waves) and other shapes that act to blend the colors and also help to accentuate a three-dimensional rendering of the subject. This invention gives the illusion of a soft white light source but with the added desirable qualities of minimizing imperfections and improving the “natural look” of human faces, especially with digital photography, and designed to replace traditional uniform lighting instruments (soft boxes) and reflection (bounce) cards.