11 results about "Reflectance properties" patented technology

The utility model provides a structure that can improve vehicle camera flare problem relates to optical camera technical field, the edge of PCBA board is provided with the recessed support on upside, the middle of recessed support is provided with the light transmission CG board, the upside of recessed support is provided with camera light control adjustment subassembly, the upside of recessed support is welded with the stepped light shield outer cover, the upside of stepped light shield outer cover is welded with light guide lens barrel, the stepped light shield outer cover passes through three stages and gradually contracts structure, effectively blocks the direct incidence path of external stray light, avoids the multiple reflection of light in the internal cavity, and the matte coating of stepped light shield outer cover and recessed support inner wall can effectively absorb residual stray light, reduces internal reflection intensity, and black matte nanometer composite material has high light absorption rate and low reflectivity characteristics, further restrains light scattering, thereby cooperates recessed structure and ladder light shield design, improves the anti flare ability comprehensively, ensures the clear and stable imaging.

The invention provides a low-scattering conductive adhesive film, a non-developable curved surface structure conductive layer and a preparation method and application thereof.The low-scattering conductive adhesive film comprises an insulating resin matrix and conductive particles, the conductive particles with the volume fraction lower than 10% are dispersed in the insulating resin matrix, and the nominal diameter D of the conductive particles is larger than the nominal thickness T of the adhesive film before curing, d ranges from 15 micrometers to 350 micrometers, T ranges from 10 micrometers to 300 micrometers, D is kept to be larger than or equal to T, and D / T ranges from 1.1 to 2.0. The low-scattering conductive adhesive film provided by the invention has excellent low reflectivity, can realize reliable Z-direction conductive connection, and has good process and structure compatibility.

The application discloses a material reflection characteristic detection method and device, a storage medium and an electronic device. The material reflection characteristic detection method comprises the following steps: controlling a target light beam to irradiate a material surface of a material to be measured in a target incident angle; acquiring a reflection light spot formed by a reflection light beam of the target light beam on a reflection path of the target light beam; controlling a power meter with a single slit on the surface to scan the reflection light spot in a target direction to obtain a power data set; and determining a target material reflection characteristic of the material surface in the target incident angle according to the power data set and beam information of the target light beam, wherein the target material reflection characteristic comprises a target reflectivity characteristic and a target power distribution characteristic, and the target power distribution characteristic is used for indicating a power distribution condition on the reflection light spot. By adopting the technical solution, the problem of low detection efficiency of material reflection characteristics in the related art is solved.

The present disclosure relates to a dynamic integration time controller for time-of-flight ranging systems. According to embodiments, a system can dynamically control the integration time in a time-of-flight (ToF) device based on the current operating state. A signal scaler processes calibration data and real-time measurements to determine the desired signal and ambient rate. Parallel calculations determine the desired integration time, one based on achieving maximum ranging distance and the other based on the measurement accuracy requirements. The system selects the longer integration time and applies user-defined bounds to optimize power consumption while maintaining specified performance. By adapting the integration time to ambient light conditions and target reflectivity characteristics, the system is able to shorten the integration time in favorable conditions while automatically increasing the duration when needed for long distances or low reflectivity targets.

In a method for displaying a virtual object (140), a scene (100) is imaged. The scene includes a target device (120). The target device includes a set of color target elements (121) having known reflectance properties and at least one illumination target element (122) having a plurality of known surface normals. At least one image of the scene is processed to determine measured colors of the color target elements and illumination and viewing conditions of the scene. Color transform parameters are computed by comparing the measured colors of the color target elements to the known reflectance properties. The virtual object is rendered for the determined illumination and viewing conditions. The rendered virtual object is aligned with the scene. A color transform is applied to the imaged scene and / or to the virtual object, and a superposition of the rendered virtual object and the imaged scene is displayed in real time on a display device (220) as illumination and / or viewing conditions change.

The invention discloses a machine learning-based wheat above-ground biomass unmanned aerial vehicle remote sensing monitoring method, which relates to the field of intelligent agriculture, and comprises the following steps: obtaining a color index related to wheat above-ground biomass AGB by using a multispectral image and a visible light image obtained by an unmanned aerial vehicle remote sensing technology; constructing a multi-source vegetation index data set by combining the reflectivity characteristics of the multi-spectral wave bands to form a first data set; and adopting a machine learning algorithm to construct a model according to the first data set for monitoring the wheat AGB. According to the invention, a machine learning framework fusing the multi-spectral data of the unmanned aerial vehicle and the agricultural parameters is provided for estimating the AGB in the key growth period, the multi-source data fusion effect is highlighted, and technical support is provided for precision agriculture.

The invention discloses a preparation method of a high-emission radiation refrigeration film, which comprises the following steps: mixing a transparent resin matrix, a diluting monomer, an ultraviolet light absorber and a near-infrared reflecting agent in proportion, and carrying out ultrasonic dispersion to obtain premixed slurry; then adding a surface additive and a photoinitiator, and uniformly stirring to obtain a coating liquid; the coating liquid is coated on the surface of a transparent polymer base material, and is cured by ultraviolet light with the wavelength of 365 nm to obtain the radiation refrigeration film. The infrared emissivity of the prepared film is not lower than 0.94 in the 8-13 [mu] m atmosphere window wave band, the visible light transmittance is high, meanwhile, the excellent ultraviolet blocking and near-infrared reflection performance is achieved, and the passive cooling effect of 5.6-9.8 DEG C can be achieved. The method is simple in process, rapid in curing, suitable for continuous production and suitable for light-transmitting occasions needing efficient heat dissipation such as buildings and traffic.

Systems and methods for generating and using statistical models to mitigate atmospheric effects in images are described. In some embodiments, a statistical model may be generated by selecting a vegetation type that grows in continuous healthy canopies; identifying a vegetation reference value that is a stable reflectance property of the vegetation type; in a plurality of images, selecting one or more plots of the vegetation type and obtaining top-of-atmosphere reflectance for the plots; selecting discrete areas near the plots and obtaining top-of-atmosphere reflectance for the discrete areas; obtaining image statistics for the discrete areas; and generating a statistical model based on the acquired data.

Imaging lens (10) comprising the following: a plurality of lens elements (12, 13, 14) arranged sequentially along a beam path from an object side to an image side, wherein a central axis (AL) of the imaging objective (10) passes through a center of each of the plurality of lens elements (12, 13, 14), the plurality of lens elements (12, 13, 14) includes a center-shielding lens element (12), and the center-shielding lens element (12) comprises: a first optical surface (121), wherein the central axis (AL) passes through the first optical surface (121); and a second optical surface (122) which is arranged opposite the first optical surface (121); the second optical surface (122) comprises: a center-shielding area (RG1), wherein the central axis (AL) passes through the center-shielding area (RG1) and the center-shielding area (RG1) comprises a light-shielding layer (L1); and an optical transmission area (RG2) that is adjacent to and surrounds the center-shielding area (RG1); wherein an inner side (S1) and an outer side (S2) of the center-shielding area (RG1) both have properties of low reflectivity.

The invention provides an injection molded light guide member and a head mounted display having the same. Provided is an injection-molded light guide member capable of providing a high-resolution image without image distortion, while suppressing undesirable situations such as uneven brightness, uneven color, and rainbow patterns, even when a partial mirror having a reflectance characteristic with polarization selectivity is disposed in an input coupler, a waveguide unit, and an output coupler. This injection-molded light guide member is provided with: a base material part; an input coupler that enters light from the image display device into the light guide member; light guide parts on two opposite surfaces for guiding the incident light by a plurality of repeated reflections; and an output coupler that extracts light from the light guide body while causing the guided light to face an eye of an observer by means of refraction, diffraction, and reflection functions, the absolute value of the photoelastic coefficient being 10 * 10-12 Pa-1 or less, and a partially reflecting mirror that transmits a portion of the light and reflects the remaining light being formed on at least one of the three surfaces of the waveguide section and the output coupler.

In a method for displaying a virtual object (140), a scene (100) is imaged. The scene comprises a target apparatus (120). The target apparatus comprises a set of color target elements (121) having known reflectance properties and at least one illumination target element (122) having a plurality of known surface normals. At least one image of the scene is processed to determine measured colors for the color target elements and illumination and viewing conditions for the scene. Color transformation parameters are calculated by comparing the measured colors and the known reflectance properties of the color target elements. The virtual object is rendered for the determined illumination and viewing conditions. The rendered virtual object is aligned with the scene. A color transformation is applied to the imaged scene and / or to the virtual object, and an overlay of the rendered virtual object with the imaged scene is displayed on a display device (220) in real time while the illumination and / or viewing conditions are changed.