8results about How to "Downsampling" patented technology

The application belongs to the technical field of radar signal processing and imaging, and provides a differential coupling single-frequency time-varying low-quantization imaging method, which comprises receiving a SAR echo signal, constructing a single-frequency time-varying threshold signal, single-bit quantization processing of a reference channel, single-bit quantization processing of a phase shift channel, double-channel data fusion and harmonic cancellation, and imaging processing based on a synthesized signal. The application effectively reduces the quantization noise base and improves the detection capability of a SAR system on weak targets under the premise of not significantly increasing the hardware cost.

The embodiment of the invention discloses an image rendering method and device and electronic equipment. The method comprises the steps that an image picture collected by a target camera is written into a target rendering texture; obtaining a width value and a height value of the target rendering texture in a three-dimensional space according to the resolution of the target rendering texture, the pixel ratio per unit and the zoom factor; constructing a cylinder model according to the width value and the height value of the target rendering texture in the three-dimensional space, and obtaining the horizontal resolution and the vertical resolution corresponding to the cylinder model; constructing a three-dimensional grid according to the horizontal resolution and the vertical resolution corresponding to the cylinder model; performing image rendering on the three-dimensional grid according to textures in the target rendering textures; according to the method, scene rendering is performed in combination with the rendering texture, and scene content does not need to be drawn on a buffer, so that one-time additional texture sampling is reduced, the whole rendering process is simplified, and meanwhile, the rendering quality can be improved.

The invention provides a method for rapidly testing a frequency response curve of a voltage standing wave ratio of a radio frequency device, which comprises the following steps of: firstly, selecting a small number of test frequency points according to a detection frequency range to carry out initial test, and then accurately calculating information density by utilizing a local standard deviation model to identify a key frequency band; thirdly, comprehensively evaluating the information density of each frequency band and the characteristics of the microwave device through a weighted distribution model, and intelligently determining the number of necessary test frequency points in each frequency band, namely the number of optimal test frequency points; and finally, taking an output result of the weighted distribution model as an input of an equidistant distribution model, finely setting an optimal test frequency point interval degree in each frequency band, and implementing a secondary sampling test, thereby efficiently and accurately generating a voltage standing wave ratio frequency response curve of the radio frequency device in the test frequency band.

The invention relates to the technical field of wastewater biotoxicity detection equipment, and discloses an integrated rapid detection device based on biotoxicity in wastewater, which comprises a conveying shell and a feeding assembly, the feeding assembly conveys wastewater through a water suction pipe in the feeding assembly; the conveying assembly is arranged on the conveying shell, and the conveying assembly conveys the feeding assembly through a conveying frame in the conveying assembly; the moving assembly is arranged on one side of the conveying shell, and the moving assembly drives the feeding assembly to move through a clamping plate pair; by arranging the moving assembly, a water suction pipe can be clamped and moved to extract and transfer wastewater in a wastewater sampling bottle into a detection bottle filled with luminous bacterium freeze-dried powder, and the water suction pipe can be quickly replaced, so that the sampling operation of a worker can be reduced when multiple groups of detection samples are extracted, and the detection efficiency is improved. The sampling efficiency during detection of the biotoxicity in the wastewater is improved.

The invention discloses a terahertz hyperspectral image recovery method and system based on low-rank joint sparsity, and mainly solves the problems that in the prior art, a terahertz hyperspectral image recovery method adopts a single primary function for representation, detail loss and artifacts are easily caused, and the imaging quality is poor in a low sampling rate or low signal-to-noise ratio environment. According to the implementation scheme, the method comprises the following steps: sparsely acquiring a terahertz hyperspectral image of an image domain to obtain actual observation data; defining a sparse forward transformation operator and a sparse inverse transformation operator by using multiple groups of wavelet bases and Dirac bases; the method comprises the following steps: constructing a terahertz hyperspectral image recovery model based on low-rank joint sparse constraint by using actual observation data and a sparse forward transformation operator, and solving the image recovery model by using a primal-dual splitting method to obtain a recovered terahertz hyperspectral image. The terahertz hyperspectral image recovery method realizes high-resolution terahertz hyperspectral image recovery in an extremely low sampling rate or low signal-to-noise ratio environment, and can be used for medical auxiliary diagnosis, security check screening and drug detection.

The invention relates to a composite superstructure compressed sensing acoustic imaging device and method, the device comprises a disc-shaped superstructure formed by combining two fish-shaped bionic psittaclus superstructures, a plurality of internal cavities are distributed on the fish-shaped bionic psittaclus superstructures, eight folding channel units form an octagonal superstructure, and the octagonal superstructure is provided with a plurality of hollow cavities. Orthogonal sound channels are distributed on the folding channel units. The method comprises the following steps: according to a target sound source detection frequency band, determining geometric parameters of an acoustic unit, according to target sound information and an expected position, dividing a detection direction into a plurality of grid points, carrying out predictive detection on each target sound source at each grid point, and according to complex sound signals measured by internal sensors of two fish-shaped bionic psittaclus superstructures, determining a target sound source according to the complex sound signals. A compressed sensing observation matrix is jointly constructed, and system testing and training are completed; and according to complex sound signals measured by the two sensors, in combination with the compressed sensing observation matrix, reversely deducing the azimuth relation between the sound source and the two sensors, and according to the distance between the two sensors and the two azimuth angles, obtaining the sound source direction and the relative distance.

The invention discloses a low-power-consumption geomagnetic vehicle detection method and system. The method comprises the following steps: acquiring triaxial geomagnetic data; performing first-order difference and filtering on the three-axis data to obtain a smooth first-order difference signal; in a vehicle-free state, a mean value and a standard deviation are obtained through calibration, a Gaussian probability density function is established, an integral interval is constructed based on a deviation amount, a single-axis condition probability item is calculated through integration, and three-axis fusion is performed in combination with a state-related correlation correction coefficient to obtain a vehicle existence probability; in a state machine model including no vehicle, arrival detection, delay confirmation, and vehicle passing and leaving detection, outputting a vehicle arrival moment and a vehicle leaving moment according to a vehicle existence probability, a hysteresis threshold, a continuous point criterion and a delay confirmation mechanism, and compensating and correcting group delay introduced by filtering; and reporting detection information when the vehicle arrival event or departure event is output. According to the method, low power consumption and baseline drift resistance are both considered under the condition of a relatively low sampling rate, and the vehicle detection robustness is improved.

The present invention discloses a target detector and a target detection method, wherein the target detector comprises: a sound detection unit and an envelope detection unit, wherein the sound detection unit comprises a plurality of sound sensors for detecting audio signals around the target detector; the envelope detection unit is used to perform amplitude envelope feature processing on the audio signal detected by the sound detection unit and output an amplitude envelope signal, so that the target detector can judge whether there is voice around the target detector according to the amplitude envelope signal. The target detector and the target detection method provided by the present invention solve the problem that the target detection method in the prior art is too complicated.