56 results about "Atmospheric optics" patented technology

The present invention discloses a transformer substation video image sharpening method in accordance with human eye visual characteristics, and belongs to the field of image communication, video image processing, intelligent power station and the like. According to the invention, the method comprises the steps of 1) acquiring the video image of a transformer substation; 2) based on the partitioning principle, adaptively acquiring an atmospheric brightness value; 3) according to an atmospheric optical imaging model, establishing an image degradation equation and solving out a rough transmittance and other parameters based on the dark primary color priori knowledge; 4) with the gray-level image of an original image as a bootstrap image, guiding a rough atmospheric light curtain in combination with the bilateral filtering means so as to obtain a new atmospheric light curtain, and further reversely deducing a preliminary restored image; 5) in combination with human eye LMS visual characteristics, enhancing the restored image under an LIPC color logarithmic image processing framework so as to obtain a fog-free clear image more consistent with the habits of human eyes. The method is remarkable in defogging effect, clear in details, natural in color, and wide in application prospect. The method effectively solves the video definition problem of transformer substations in the prior art.

The invention discloses a high-spectrum-resolution total atmospheric spectral transmittance measuring method. The method includes: using a target tracking device for acquiring sunlight or starlight penetrating the atmosphere as signal light, taking a high-coherence narrow linewidth laser as local oscillation laser, subjecting the signal light penetrating the atmosphere and the local oscillation laser to optical mixing in a heterodyne detector prior to passing through an intermediate-frequency filter and a square-law detector, sending to a band-pass filter to remove noise, enabling a computer to collect for obtaining a heterodyne signal generated by combination of the signal light penetrating the atmosphere and the local oscillation laser, and processing the heterodyne signal to obtain a high-resolution spectrum of weak signal light penetrating the atmosphere. The high-spectrum-resolution total atmospheric spectral transmittance measuring method is used for real-time measurement of total atmospheric spectral transmittance and applicable to fields of atmospheric optics, meteorological research, atmospheric pollution monitoring, detection and the like, and quick response and real-time measurement of high-spectrum-resolution total atmospheric spectral transmittance can be realized according to the method.

The invention discloses a remote sensing image terrain standardization method. In a Ross Thick-Li Sparse linear kernel driver model, slope and orientation are introduced into a Ross volume scattering kernel function and a Li geometrical optical kernel function to establish a mountain BRDF (Bidirectional Reflectance Distribution Function) model; on the basis of a conventional remote sensing image terrain standardization result, an assumption of the earth surface about a Lambertian reflectance characteristic is changed, and the mountain BRDF model is introduced to maximally reduce the influence of a change in the BRDF shape of a complicated topographical region; atmospheric parameters at the border crossing moment of a satellite image are obtained by taking MODIS (Moderate Resolution Imaging Spectroradiometer) water vapor and aerosol atmosphere products as terrain standardization model parameters, so that the influence of optical factors of the atmosphere is eliminated. According to the method, radiometric distortion of a remote sensing image caused by optical properties of the atmosphere is eliminated, and in addition, radiometric distortion caused by factors such as terrain shielding and BRDF properties of the earth surface is effectively eliminated, so that the real reflectivity of the earth surface is obtained.

This invention discloses one four-hole difference image move atmosphere optical parameters measurement device, which comprises four hole iris board, Schmitt and Cassegrain telescope, optical imaging lens, five-angle prism, four prism tamper, plane CCD sensor, image collection card and computer, wherein, the sensor is on focus plane of the lens; due to the split function, the sensor can get four images of same one aim to form rectangle form; base line has six match type to measure atmosphere relative length to get gas 1w samples.

A method for real-time restoration of a fog-degraded image with white balance correction relates to the image information processing field and solves the problems of complex algorithm, image shift in image processing process and unachievable embedded platforms such as DSP (Digital Signal Processor) and the like in the existing fog image restoration method. The method comprises the following steps of: performing normalization operation on an original fog-degraded image in the atmosphere background and extracting the minimum channel image of the original fog-degraded image, and obtaining a dark channel image by a statistical filtering quick method with O (N) complexity; then, obtaining the transmission parameter image of the original fog-degraded image; obtaining the restored image of the normalized fog-degraded image by using the transmission parameter image according to an atmosphere optical imaging model; and finally, according to the white balance theory, mapping the normalized restored image range to [0, 255] by taking the atmosphere background light as pure white. As a result, the output image obtained through white balance global mapping is the final restored image. The method provided by the invention is capable of meeting various outdoor scene monitoring application requirements.

The invention discloses an in-orbit absolute radiation calibration method for simplifying radiation transfer calculation based on multi-energy-level targets. According to the invention, a gray-scale target (target plate), a reflector, an active light source and other multi-energy-level targets are used as references, and separation of target radiation from atmospheric path radiation and surface-atmosphere coupled radiation is calculated by using linear regression; and the in-orbit absolute radiation calibration of optical remote sensors is realized through a combination of measurement of the optical thickness of on-site atmosphere, a ratio of diffusion to total irradiance (needed if the target is a diffusion target) and the energy of the multi-energy-level targets, and calculation of the transmittance of atmospheric absorption gases. The in-orbit absolute radiation calibration method of the invention uses data actually measured on the ground as main data and does not depend on radiation transfer calculation, so the influence of aerosol, atmosphere modes and other factors is reduced; and the in-orbit absolute radiation calibration method can realize full-dynamic-scope high-precisioncalibration of the optical remote sensors.

The invention discloses an atmospheric optical turbulence intensity measurement, evaluation and correction method, and is applied to the technical field of atmospheric optical turbulence intensity measurement. The method comprises the following specific steps: sampling high-frequency sound imaginary temperature time series data in real time by adopting a high-precision ultrasonic anemograph, and preprocessing the sound imaginary temperature time series data, and obtaining atmospheric temperature time series data; converting two-point temperature difference of a time interval into space two-point temperature difference according to a preset sampling frequency value, a scale value of an inertia zone, statistical time and a wind speed average value in the statistical time, and measuring a temperature structure constant in real time by a single-point structure function method; and calculating a temperature structure constant value by a single-point spectrum method, and evaluating and correcting the temperature structure constant value obtained by the single-point structure function method from the value range of the spectrum power rate to obtain an accurate value of the temperature structure constant. A guarantee is provided for continuously obtaining accurate optical turbulence intensity for a long time all day long.

The invention relates to a coherent wind lidar wind measurement performance analysis method and system. The method includes the steps that firstly, hardware parameters in a subsystem unit are set according to expected design indexes, related indexes in a transmission logic interface unit are set, and atmosphere optical properties of coherent wind lidar work are set; secondly, according to the set parameters, the indexes and the atmosphere optical properties, the whole wind measurement process of coherent wind lidar is simulated, wind measurement precision of an initial set threshold is obtained according to hardware parameters in a feedback debugging subsystem unit and the related indexes in the transmission logic interface unit, and optimized hardware parameters, optimized related indexes and optimal wind measurement precision in different atmosphere environments are obtained. By means of the method and system, the coherent wind lidar meeting requirements can be conveniently designed, the early-stage design stage is guaranteed, system hardware is calculated and analyzed again, and the optimal hardware parameters are obtained.

The invention discloses an on-orbit absolute radiation calibration method for an optical sensor based on a reflector array, which takes the reflector array as a reference target to separate target reflection radiation from atmospheric path radiation, earth-atmosphere coupling radiation and ground object thermal radiation by using linear regressive calculation. On-orbit absolute radiation calibration for a middle-infrared band optical remote sensor through measuring the field atmospheric optical thickness, temperature, humidity and pressure profile and reflector specular reflectance and combining calculation for the atmospheric absorption gas transmission rate. The on-orbit absolute radiation calibration technology for the middle-infrared band optical remote sensor mainly relies on ground measured data, and does not depend on radiation transmission calculation, thereby reducing influences of factors such as an aerosol and an atmospheric mode. The calibration technology can realize full-dynamic-range and high precision calibration for the middle-infrared band optical remote sensor.

The invention discloses a multi-parameter temperature-controlled absorption cell device capable of simulating the vertical atmospheric environment. The absorption cell device is characterized by comprising a parameter-controllable, single-optical path, single-pass and low-temperature absorption cell, a parameter-controllable, single-optical path, single-pass and moderate-temperature absorption cell and a parameter-controllable, single-optical path, single-pass and ordinary-temperature absorption cell which are connected in series, wherein the low-temperature and the moderate-temperature absorption cell are connected with each other through a first optical path means; the moderate-temperature and the ordinary temperature absorption cell are connected with each other through a second optical path means; through adjusting the temperature of the single absorption cell and the gas volume mixing ratio thereof, the parameters, such as temperature gradient and pressure gradient, of the vertical atmospheric layer can be simulated in a laboratory. The absorption cell device can be used for measuring and analyzing parameters of atmosphere molecule absorption spectrum in direct combination with an absorption spectrum technology, based on which the vertical atmosphere transmittivity can be obtained, and discipline of atmosphere molecule absorption spectrum can be generalized; as the indoor environment is more stable, the device has the advantages of high precision, good stability and the like, and has important meaning for research of atmospheric optics.

The invention relates to the technical field of atmospheric optics, and in particular relates to a system for realizing integrated observation of sun and sky radiation and a self-calibration method. The system comprises a supporting frame, an entrance pupil diaphragm is arranged on the supporting frame, a first window lens is arranged on the entrance pupil diaphragm, an attenuation piece is fixed to the center of the side face, close to a detector, of the first window lens, and the attenuation piece and the first window lens form an annular entrance pupil. Compared with the traditional method that two sets of receiving optical systems/two sets of measuring equipment are used for observing the sun to measure the atmospheric transmittance, the water vapor column content and the sky background radiance, the system provided by the invention has the advantages that the detection of two signals with different intensities is realized by adopting an annular entrance pupil and utilizing a spatial light splitting method, so that a rotary filter wheel is not needed; the whole system is simpler in structure, and the measurement of the sky background brightness can be calibrated in real time; the size and the weight of the system are reduced, and the operability of equipment can be remarkably improved.

The invention provides an optical measurement method and device for ocean colour voyage, a computer device and a computer-readable storage medium. The optical measurement method comprises the steps of: obtaining the first radiance, the second radiance, the incident irradiance and atmospheric optical parameters; on the basis of the first radiance, the second radiance and the incident irradiance, calculating the remote sensing reflectance; and, on the basis of the remote sensing reflectance and the atmospheric optical parameters, calculating remote sensing field information. By means of the optical measurement method provided by the invention, influence of atmospheric aerosol can be eliminated; furthermore, the water environment monitoring efficiency is increased; the real-time performance and the accuracy are improved; and thus, the water environment monitoring effect and effect can be improved.

The invention discloses an expressway agglomerate fog visibility identification method based on a dark channel prior theory. The method comprises the steps that dark channel conversion is conducted onan original image to obtain a dark channel image, the image transmissivity of the dark channel image is obtained according to an atmospheric optical model and dark channel prior, an extinction coefficient is determined according to the image transmissivity, and visibility is determined according to the extinction coefficient. The method can guarantee the accuracy of the identification result andis simple in algorithm and is high in real-time performance.

The invention relates to the field of atmospheric optics, and specifically relates to an optical initial radiation intensity calibration method, device and system. The method comprises the steps: obtaining an earth-sun distance correction factor and relative air mass at a moment of measurement, and a voltage value of light, with a given wavelength, outputted through a measurer when the relative air mass is within at least one measurement section, wherein the maximum difference between the maximum value and the minimum value of the relative air mass in the measurement section is two; carrying out reciprocal transformation of the relative air mass corresponding to the voltage value outputted by the measurer; and employing a least square regression algorithm to calculate a calibrated voltage value in each measurement section according to the Beer-Lambert law, the voltage value of light, outputted through a measurer, with the given wavelength, the relative air mass after reciprocal transformation and the earth-sun distance correction factor at the moment of measurement. The method can reduce the measurement requirements of calibration, can complete measurement in a short time, reduces the measurement errors, and improves the practicability of measurement.

The invention discloses a method for comprehensively measuring three parameters of the optical turbulence of the whole-layer atmospheric. The method comprises the following steps of 1, selecting a telescope with a caliber of 300mm or above to receive the parallel light passing through the whole layer of atmosphere; 2, on the basis of an existing atmospheric coherence length and isoplanatic angle two-parameter measuring instrument, receiving all light intensities on an unutilized pupil area (in order to describe conveniently, the area of the pupil area is called R for short) of the telescope byutilizing a detector; and 3, calculating the light intensity fluctuation variance on the clear aperture of the whole telescope by combining the light intensity data in the sub-holes of the two-parameter measuring instrument to obtain an inclined isoplanatic angle, namely a third parameter. The three parameters of the atmospheric coherence length, the isoplanatic angle and the inclined isoplanaticangle can be continuously measured in real time, and the three parameters of turbulence can be simultaneously measured by one instrument for the first time; the third parameter is measured on the basis of the existing two-parameter measuring instrument, and the instrument is little in modification, is easy to achieve, can be utilized fully and is high in cost performance.

The invention discloses a method for eliminating influence of background light and thermal noise on measurement accuracy of an atmospheric extinction coefficient. The method comprises the following steps that: firstly, output energy of a laser is reduced and scattering echo signals of laser beams with different energies are measured; because background light signals and thermal noise signals in two echo signals are equal in a short interval, the background light signals and the thermal noise signals are mutually offset through a subtraction of the two echo signals; lastly, a equation of the subtraction of the two echo signals is inversed to obtain a real atmospheric extinction coefficient. According to the present invention, a new experiment and a new inversion method are provided for effective eliminating the influence of the background light and the thermal noise on the measurement accuracy so as to obtain an exact and reliable atmospheric extinction coefficient.

The invention relates to a digital-camera-based method for measuring atmospheric visibility and an Angstrom index. A measuring device is formed by a common digital camera controlled by a computer; thecomputer calculates atmospheric visibility by obvious contrast between dark matters and a background in a shot photo based on the Lambert-Beer's law to calculate; and with two different methods, thevisibility is measured on normal and low-visibility conditions. Besides, extinction coefficients of different wavelengths are measured by using three kinds of color channels of the camera and an Angstrom index as an important parameter in atmospheric aerosol classification is obtained, wherein the Angstrom index is a most basic parameter representing the atmospheric optical property and is used for calculating the atmospheric aerosol content. Therefore, a problem of high cost of the visibility measuring instrument is solved; and the measuring method has the advantage of low cost.

The invention relates to an aerosol particle spectrum distribution fitting method and system based on haze measurement data. The method comprises steps that a laser radar and a solar photometer are employed to respectively measure aerosol optical properties to acquire laser radar data and solar photometer data; the optical thickness of the lower atmosphere is acquired through inversion based on the solar photometer data; an extinction coefficient of the lower atmosphere is acquired through inversion based on the laser radar data; aerosol particle spectrum distribution of the lower atmosphere is acquired through inversion by employing the extinction method based on the optical thickness of the lower atmosphere and the extinction coefficient of the lower atmosphere acquired through inversion. The method is advantaged in that in combination with the measurement data of the laser radar and the solar photometer, atmospheric optical thickness stratification and the extinction method are utilized to retrieve aerosol spectrum distribution characteristics, and a particle spectrum distribution fitting function of the lower atmosphere is acquired.

The invention discloses a laser line transmittance extracting method based on direct radiation of a sun wide spectrum. Generally, a laser line transmittance is extracted through an extrapolation method, or the laser line transmittance is extracted through a field measuring method. The method of the invention can measure and extract the laser line transmittance based on direct radiation of the sun wide spectrum. The invention provides two methods which are low in cost and capable of obtaining atmospheric transmittances of various laser wavebands in real time. The methods can overcome defects of acquiring the laser waveband atmospheric transmittance through an atmospheric optic transmittance software package and a laser radar. The laser waveband transmittance obtained through the method can be applied to laser atmospheric transmission correction and has important significance in evaluating laser ranging, laser communication, laser transmission and laser guidance.

The invention discloses a statistical method for atmospheric optical turbulence parameters. The method comprises the following steps that elevation angle values of the sun before and after the sun passes through the top are distinguished through solar azimuth marks, when the solar azimuth ranges from 0 degree to 180 degrees, atmospheric optical turbulence parameters are data of the upper half day,and when the solar azimuth ranges from 180 degrees to 360 degrees, the atmospheric optical turbulence parameters are data of the lower half day; the value of the pitch angle greater than 0 degree andthe maximum value of the pitch angle is normalized, and the value of the pitch angle less than 0 degree and the minimum value of the pitch angle is normalized; a statistical analysis rule of the atmospheric optical turbulence parameter along with the normalized solar pitch angle alpha is calculated; and the normalized solar pitch angle alpha is cycled by using a trigonometric function to obtain astatistical analysis rule of the atmospheric optical turbulence parameters along with the cycled solar pitch angle alpha. The method can perform quantitative analysis on atmospheric optical turbulence parameter measurement values of different months and different places.

The invention discloses an improved B-spline non-rigid registration method for distortion correction of an atmospheric turbulence image, relates to the field of atmospheric optics, and mainly solves the problem that the correction performance is unstable when the atmospheric turbulence image is seriously distorted in a traditional registration method. The method comprises the following steps: inputting an image sequence degraded by atmospheric turbulence, taking an average frame of the image sequence as a reference image, and taking each frame in the image as a floating image; generating a uniform grid control point matrix; generating an image deformation field by adopting B-spline non-rigid transformation; the floating image is transformed according to the deformation field, and normalized square difference between the floating image and the reference image is carried out to serve as a target function of image registration similarity; solving an optimal control point matrix when the target function is minimum by using an adjustable exponential damping factor LM algorithm fused with a particle swarm algorithm; and obtaining a registered floating image according to the optimal control point matrix. When the method is used for processing multiple frames of distorted turbulence images, the stability is relatively good, and relatively good image correction quality can be obtained.

An aerosol extinction coefficient inversion method based on an unmanned aerial vehicle atmospheric laser radar comprises the following steps: step 1, a diffuse reflection plate is placed at a ground target position, a laser emission system is aligned with the diffuse reflection plate after the unmanned aerial vehicle atmospheric laser radar lifts off to a fixed height, and laser pulses are emitted perpendicular to the diffuse reflection plate; step 2, a laser receiving system receives a back scattering signal, a photoelectric detection and data acquisition system performs signal conversion and acquisition, and then a data processing system calculates atmospheric optical parameters between the unmanned aerial vehicle atmospheric laser radar and the diffuse reflection plate; step 3, the unmanned aerial vehicle atmosphere laser radar ascends to the fixed height n times, the step 2 is repeated n times, the atmosphere transmittance and the optical thickness of the corresponding height are obtained, and then the aerosol extinction coefficient condition is obtained; step 4, the unmanned aerial vehicle atmosphere laser radar can hover at a fixed height for n times in the descending process, and the step 2 is repeated for n times; the measurement in the rising process is repeated, and the accuracy of the result is improved by increasing the number of times of measurement.