16results about How to "Improve dynamic range" patented technology

This invention discloses an all-weather autonomous road defect detection method and system, relating to the field of computer vision. It includes a hybrid vision sensor for all-weather autonomous road defect detection mounted on an unmanned vehicle (UAV). The hybrid vision sensor is equipped with a computing unit, which runs a hybrid vision road defect recognition and localization algorithm. The hybrid vision in the UAV sensor includes traditional RGB vision and DVS pulse vision. The traditional RGB vision is used to detect the texture details of the road, while the DVS pulse vision is used to detect road anomalies at high speeds. By utilizing the rich texture details of RGB and combining the sensitive response of DVS vision to low light and dynamic lighting changes, the accuracy of road defect detection is improved. This invention features real-time asynchronous response, high dynamic range, information capture capability in low-light scenarios, and reduced motion blur.

This invention provides a visual sensor chip, comprising a pixel array composed of pixel units; wherein each pixel unit has a corresponding temporal difference path and a spatial difference path, or a corresponding intensity path, a temporal difference path, and a spatial difference path. This invention integrates the dual-path characteristics of the human visual system into existing visual sensor chips, thereby significantly improving the chip's ability to perceive spatiotemporal dynamic information and achieving high-precision, high-frame-rate, high-dynamic-range, and highly efficient and robust visual representation.

The invention belongs to the technical field of inertial sensors, discloses a light quantum gyroscope closed-loop control system based on quantum enhanced detection, and aims to improve the measurement precision and system dynamic range of a light quantum gyroscope based on quantum enhanced detection. According to the system, a closed-loop feedback mechanism is introduced, closed-loop feedback is carried out on phase difference caused by space rotation and detected by quantum enhancement detection, quantum state interference is optimized, the signal-to-noise ratio of interference signals of detection light is increased, intensity noise of an atom interference system is restrained, and meanwhile the dynamic range of a gyroscope system is widened.

The application provides a photoelectric chip testing device and a testing method thereof. The testing device comprises a testing seat, a probe, a light source and a code disc. The testing seat is used for fixing a testing chip. The probe is arranged in the testing seat and corresponds to a PAD disc of the testing chip and is electrically connected with the PAD disc. The light source is used for providing light to the testing chip and is arranged opposite to a photosensitive area of the testing chip. The code disc is used for adjusting an area of the light of the light source irradiating to the photosensitive area of the testing chip. The code disc is arranged between the testing chip and the light source. The code disc is provided with at least one light transmission area. When the code disc rotates, the light of the light source irradiates to the photosensitive area through the light transmission area. The photoelectric chip testing device and the testing method thereof provided by the application can change the light energy of the light irradiating to the photosensitive area by changing the area of the light of the light source irradiating to the photosensitive area, thereby improving the accuracy of the testing result.

A method of fabricating an electrically-controlled birefringence cell. The cell has a cell gap no more than 20 micrometers. The cell has an alignment layer arranged to impart a pretilt on liquid crystal in contact with the alignment layer. The method comprises processing the alignment layer to achieve a surface anchoring value between the liquid crystal and alignment layer of less than 1 mJ / m2.

The invention provides a radar ranging method and device, electronic equipment and a computer readable storage medium, and relates to the technical field of radars, and the method comprises the steps: obtaining a plurality of measurement data sets obtained through the sampling of at least one echo signal in a measurement period based on a plurality of threshold values; wherein the echo signal is sampled based on a threshold value to obtain a measurement data set, and each measurement data set comprises at least one piece of measurement data; determining M pieces of alternative data and N pieces of auxiliary data in the plurality of measurement data sets, and obtaining the total composite degree of each piece of alternative data; wherein M and N are positive integers, and the sum of M and N is equal to the total number of measurement data contained in the plurality of measurement data sets; determining target data from the M pieces of alternative data according to the total composite degree; and determining a measurement distance according to the target data. According to the invention, the dynamic range of the laser radar system can be improved, so that the measurement precision of the laser radar is improved, and the close-range detection blind area of the laser radar is shortened.

The invention provides a pixel reading circuit and a control method thereof, and the pixel reading circuit comprises a photoelectric conversion module, a gain adjustment module, a correlated double sampling module, a gain control feedback module and an output module. The gain adjusting module is used for carrying out integral processing on the light current signal to obtain integral voltage, the correlated double sampling module is used for sampling the integral voltage to obtain effective signal voltage, and the gain control feedback module is used for generating a gain control signal based on the effective signal voltage so as to adjust integral gain. And the output module buffers and outputs the effective signal voltage. According to the circuit provided by the invention, the correlated double sampling function is integrated in the pixel, the number of used switches is small, time sequence control is simple, the pixel area is reduced, the chip integration degree is high, multiple times of transmission of signals between the pixel and the column-level circuit is avoided, the processing pressure of the column-level circuit is relieved, and the system frame rate is improved.

The invention discloses an ambient light elimination method, a light detection sensor and a system, and belongs to the technical field of proximity light sensors. In the calibration stage of the sensor, a current compensation module dynamically adjusts compensation current according to a compensation control signal output by an error amplification module, counteracts a current signal generated by ambient light and establishes a compensation state; in the detection stage, the current compensation module keeps the established compensation state, so that the compensation current continues to offset the ambient light current, and the integrator module only carries out integration on the current corresponding to the target light signal. According to the invention, a method for later compensation depending on digital signal processing and a digital-to-analog converter in a traditional scheme is abandoned, a front-end analog direct elimination mechanism is provided, ambient light current is directly offset through an analog feedback loop in an initial stage of a signal chain, namely before analog-to-digital conversion, and delay and precision limitation caused by digital processing are avoided.

The application provides a CMOS image sensor, a CMOS camera and a high dynamic range CMOS camera imaging method, and aims to solve the technical problems of low noise process and pixel size optimization of the CMOS image sensor, long process, complex process and large cost investment. The CMOS image sensor comprises a coated window and an uncoated window; the coated window is coated with a layer of fluorescent material, the coated window is used for receiving light emitted by the fluorescent material, and the uncoated window is used for receiving light of a photographed object. The CMOS camera comprises the CMOS image sensor, the area proportion of the fluorescent material coated by the CMOS image sensor and the attenuation coefficients of different fluorescent materials, and the dynamic range is flexibly adjusted by cooperating with corresponding secondary exposure and data reading mode.

This application discloses a high-performance laser detection system, a laser detection data analysis method, and an apparatus, relating to the field of laser testing. The system includes: a laser, two optical lens groups, a fiber optic cone, a photodetector, and a signal processing circuit. The laser and the two optical lens groups work together to form two laser screens. The fiber optic cone is coupled to the surface of the photodetector. The photodetector detects the laser signals passing through the two laser screens. The signal processing circuit amplifies the electrical signals using a hyperbolic tangent amplifier circuit to obtain the original laser screen signals. The method includes: sequentially filtering, fragment identification, zero-time explosion identification, and cross-screen matching of the original laser screen signals, and outputting fragment signal matching pairs and their corresponding velocities. This application improves the response speed and dynamic range of the detected light intensity of the laser detection system, while simultaneously achieving accurate identification and parameter calculation of multiple fragments, significantly enhancing the detection capability and analysis efficiency of traditional laser screens.

This invention discloses a high-throughput photon-counting lidar imaging device and method. The device includes a beam transceiver module, a scanning module, a control module, a detection module, and a data processing module. The control module controls the scanning module to change the direction of the pulsed laser output to achieve target scanning. The detection module includes a single-photon detector and a time-correlated single-photon counting acquisition unit. A synchronization signal acquisition channel is connected to the pulsed laser to acquire the pulsed laser synchronization signal. This invention introduces a single-photon detector with photon number resolution, enabling simultaneous detection of multiple echo photons and simultaneous response to different photon counts. This invention effectively solves the limitations of traditional photon-counting lidars due to low-throughput and weak-light operating conditions, effectively improves the acquisition efficiency of echo photon information under high-throughput conditions, greatly reduces pulse accumulation time, and can achieve higher dynamic range and faster target detection.

The application provides a self-adaptive adjustment distributed optical fiber vibration sensor method, system and device, which is applied to the field of optical fiber sensing technology and comprises the following steps: receiving parameters of a DVS, selecting a monitoring mode applied by self-adaptive adjustment according to the received parameters of the DVS, the monitoring mode comprising a full-line measurement mode and a local measurement mode, calculating average light intensity and interference coefficient of a preset reference optical fiber section, judging whether the average light intensity is within a preset range, if yes, judging whether the interference coefficient is within a preset range, if yes, demodulating and calculating a vibration signal and positioning information, matching state information and early warning information according to a preset algorithm model, and displaying the output state information and early warning information. The application adopts the DVS to adaptively adjust line parameters after the optical fiber is connected to realize the best monitoring effect, and the DVS is changed from professional and complex to simple and easy to use without complex debugging by professional technicians.

The present disclosure relates to a solid-state imaging device, an imaging apparatus, and an imaging method. An overflow integration capacitor is shared by a pair of photodiodes. An overflow gate is provided between a corresponding photodiode and the overflow integration capacitor. Furthermore, in the overflow gate, a barrier is set lower than a corresponding one in a transfer gate in a charge accumulation period of the photodiode.

The application provides an image processing method and device, a computer readable storage medium and a terminal device, the image processing method comprising: obtaining an image to be processed; calculating a statistical value of low-frequency information of the image to be processed in a luminance domain; determining a corresponding mapping curve according to a scene to which the statistical value belongs, the mapping curve representing a mapping relationship between an original luminance value and an adjusted luminance value of each pixel in the luminance domain, different scenes corresponding to different mapping curves; determining an adjusted luminance value of each pixel in the image to be processed according to the mapping curve; and mapping a gain of the adjusted luminance value of each pixel to each color channel of the corresponding pixel to obtain an adjusted image. The application provides an image processing scheme capable of improving the luminance of a low-light area of an image and avoiding overexposure of a highlight area.

This disclosure relates to test methods and test systems. One test method includes the following operations: generating a multi-frequency signal using a signal generator; transmitting the multi-frequency signal to an input terminal of a device under test (DUT) using the signal generator; measuring the input terminal and an output terminal of the DUT using a spectrum analyzer to obtain complex input ripple intensity and complex output ripple intensity at corresponding complex frequency points; and generating a complex power supply rejection ratio (PSRR) corresponding to the corresponding frequency points using a control device based on the input ripple intensity and the output ripple intensity.

The invention relates to a low-power-consumption and high-dynamic-range integrator suitable for a Delta-Sigma modulator, and belongs to the field of integrated circuit design. The integrator specially sets an equivalent thermal noise compression mode B for a small-amplitude input signal on the basis of a traditional integrator. Under a large-amplitude input signal, an integrator is set to be in a traditional mode A; under a small-amplitude input signal, the integrator is set to be in an equivalent thermal noise compression mode B; in the mode B, signal sampling is multiplied by performing bidirectional sampling on an input signal, but introduced noise is not multiplied compared with that in a traditional mode generally, and then the integral state of the integrator and the integral gain of the signal are not changed by doubling the integrating capacitor, so that the integral gain of the signal is not changed. The integrator does not cause system faults in the application occasion of the Delta-Sigma modulator, compared with a traditional integrator, the output or equivalent input noise power of the integrator is compressed to 1 / 4 of the original noise power, and the dynamic range of the integrator is widened by 6dB on the premise that the power consumption overhead of the integrator is not increased.