8results about "Photometry using wholly visual means" patented technology

The present invention proposes a computational imaging method and apparatus based on a complex neural network, wherein the method includes acquiring an intensity map containing complex target information on an imaging plane; pre-reconstructing the intensity map to obtain an initial estimate of the target wavefront; constructing and training a complex neural network, wherein the input of the complex neural network is the initial estimate of the complex target wavefront, and the output is the reconstructed complex target, thereby obtaining a trained complex neural network; and inputting the initial estimate of the target wavefront to be imaged into the trained complex neural network to obtain a high-precision target amplitude and phase image. The present invention introduces complex neural networks into computational imaging, achieving a transition from complex input to complex output. It is capable of characterizing the information correlation between the real and imaginary parts of complex domain signals within the network, thereby achieving nonlinear modeling of the complex wavefront of the object plane and realizing high-precision computational imaging.

The invention discloses a reactor inlet optical power density measurement method and system. Firstly, a heat flow meter is fixed to the inner surface of a reactor cover plate through a heat insulation support, a heliostat field is controlled to form light spots at the reactor inlet, the cover plate is driven to execute reciprocating motion of closing and then opening, and the heat flow meter is driven to penetrate through a light spot area to complete one-dimensional scanning; synchronously acquiring a heat flow meter reading signal and recording a motion video through an image recording unit; the physical position of the heat flow meter on an inlet plane is identified based on a video and a pre-established coordinate mapping relation, position information and readings are associated to obtain a discrete energy flow density measurement value, two-dimensional energy flow density distribution is reconstructed through a spatial interpolation algorithm, integration is carried out on a distribution diagram on an inlet area to calculate total incident light power, and the total incident light power is calculated. The conventional opening and closing action of a cover plate of the reactor is used as a scanning driving mechanism, and the point-to-surface energy flux density full-field reconstruction is realized by combining the mobile measurement of a single-point sensor with a visual positioning technology.

This invention discloses a method for measuring the light environment of an aircraft cockpit based on visual perception. The method includes: determining the correspondence between the brightness value of a calibration target and the grayscale value of the target image, i.e., a brightness / grayscale conversion function; determining an image of the aircraft cockpit scene during flight; and determining the brightness of the light environment of the aircraft cockpit during flight based on the image of the aircraft cockpit scene and the brightness / grayscale conversion function. The advantages of this invention are: it measures the brightness of the display screen, control panel and its operating devices, and the overall environment of the aircraft cockpit through visual perception imaging; it can measure both specific areas or points and the entire cockpit.

The utility model relates to the field of measuring device discloses a kind of integral sphere light source alignment's measuring device based on center diaphragm positioning light spot, including integral sphere and cold light source, adjustable setting between the integral sphere and cold light source;Integral sphere light passage place and cold light source place are correspondingly provided with target, and diaphragm is equipped between two targets;When the cold light source emits light, pass a target and diaphragm, to judge the coaxiality of cold light source light emitting place of cold light source, diaphragm, integral sphere light passage mouth in shape change on another target;When coaxial, then install single optical fiber detection between integral sphere and cold light source.The utility model, after light source light is marked by light emitting hole target A, diaphragm filters stray light, it is projected to integral sphere light passage hole target B, and the coaxiality is judged by target B cross light spot coincidence degree / regularity, solve the chroma error problem caused by different axis of prior art, provide accurate light path for single optical fiber detection, reduce deviation, suitable for medical endoscope cold light source detection.

A method for imaging includes illuminating a vehicle undercarriage with illumination in an atmospheric absorption band, imaging the vehicle undercarriage to form an image, wherein scanning includes filtering out illumination returned from the vehicle undercarriage that is outside the atmospheric absorption band. The method includes forming an image with the filtered illumination returned from the vehicle undercarriage.

The present invention relates to an instrument (1) for objectively measuring the dispersion of light, which is useful in the cinematography and audiovisual sector. The invention overcomes the lack of precise tools, eliminating the relativity of the concept. The instrument of the invention consists of a semi-sphere (2) made of a matte material and having a known size, serving as a constant subject. When the instrument is oriented toward a light source, an external device captures an image of the dispersion of light over the semi-sphere (2), providing an objective measurement of the dispersion. The instrument can include marks (3) for orientation, a mirrored semi-ellipsoid (5) for complementary analysis of the source, and sight holes (6, 7) for alignment. The primary use of the instrument is for evaluating and standardising the measurement of the dispersion of light on a known and constant object that takes the place of a subject.

Disclosed are a method for producing carbon quantum dots having color change based on a cumulative amount of exposure thereof to UV light, and to a color change sensor including the same that indicates a cumulative UV amount. The method for producing the carbon quantum dots include performing solvothermal reaction on blue inkjet printer dye, urea and an organic solvent in a high pressure reactor.