76results about How to "Reduce acquisition error" patented technology

The invention discloses a directly-photographed fingerprint acquisition method which is characterized by comprising the following steps: (1), setting a fingerprint acquisition module which comprises a housing cover, a photographing module and a light filling module, wherein the housing cover is a transparent or semitransparent component for carrying a finger, the photographing module corresponds to the housing cover to photograph a fingerprint on the housing cover and the light filling module is used for filling light for a shooting environment; (2), pressing the finger on the housing cover, filling light by the light filling module, and the photographing module directly photographs a fingerprint image. The invention also discloses a directly-photographed fingerprint acquisition construction used for implementing the method. The method and the construction have the advantages of small size, low cost, excellent operation experience and the like. The implement method is innovated, the photographing module is used for directly photographing the fingerprint so as to acquire the fingerprint, and the light filling module is matched with the photographing module to photograph for more than sixty times within one second in a state of white light and blue light conversion, so that finger acquisition errors are reduced and fake fingerprints are avoided. Moreover, the construction is simple and the product modality can be changed at will.

The present invention discloses a method for realizing synchronization data acquisition based on a passive optical network. Multiple passive optical networks are in one PON host or multiple PON hosts, through the method of clock sharing or clock synchronization, the synchronization among passive optical networks is realized, and a unified clock counter is ensured between an OLT and an OLT. With a passive optical network as a communication media, based on the cyclical synchronization data acquisition time stamp of an OLT reference clock counter, by using ranging and time delay compensation technology, the synchronization data collection by the ONUs of the passive optical networks at the same time is realized, thus the whole network synchronization data collection is realized, and the method has high time transfer precision. The e synchronization data is transferred to the ONU local processor for processing, or according to different application requirements, a suitable communication protocol is customized, after the protocol is completed, the synchronization data is packaged and is uploaded through a fiber network for processing, and the method has the advantages of reliable transmission and high communication bandwidth.

The invention discloses an LED splicing gap bright and dark line correction method and device, a storage medium and a terminal. A splicing gap is corrected through a correction coefficient corresponding to the splicing gap; the phenomenon that visual bright and dark lines exist between the display units (modules or box bodies) of the LED display screen during watching due to splicing gaps caused by reasons such as the machining precision and the assembling precision of the display units (modules or box bodies) can be rapidly and accurately improved; the scheme is not influenced by the environment, the visual bright and dark lines at the abutted seams can be quickly corrected while correction is performed, and the time for manually correcting the seams of the display units (modules or box bodies) is saved; according to the scheme, a Gaussian filtering method is adopted, and the optimal difference of the gap splicing effect can be judged by calculating the number of steps of a smooth one-dimensional curve; the correction coefficient is calculated by extracting the pixel gray average value, so that the acquisition error can be reduced, and the problem of excessive correction or insufficient correction is avoided.

The invention provides a method and device for collecting indoor position data of a multilayer building, and a readable medium. The method comprises the following steps: obtaining a collection starting point marked by collection personnel in a starting collection layer of the to-be-collected multilayer building and geographical coordinates of the collection starting point; with the collection starting point as an original point of a Tango reference coordinate system, obtaining a deviation value of a geographical direction and a north direction identified by a 0-degree direction of the Tango reference coordinate system; and collecting three-dimensional coordinates of collection points in indoor floors of the multilayer building according to the obtained deviation value, the geographical coordinates of the collection starting point and an air pressure value collected by an air pressure sensor. By adoption of the technical scheme of the invention, the indoor position data of the multilayer building are collected based on the Tango technology, so that the collection error of the indoor position data can be reduced and the collection accuracy of the indoor position data is improved, accordingly the indoor positioning accuracy can be improved based on the collected indoor position data.

The invention provides an acquisition method and device of indoor position data, computer equipment and a readable medium. The method comprises the steps as follows: an acquisition starting point andinitial geographical coordinates of the acquisition starting point are obtained; acquisition is performed in an indoor road network of a building with the acquisition starting point as the origin of Tango, and a Tango track is obtained; the initial geographical coordinates of the acquisition starting point and the 0-degree direction of Tango are adjusted according to the initial geographical coordinates of the acquisition starting point, the initial geographical direction where the 0-degree direction of Tango is located, the Tango track and the road network of an indoor map of the building, sothat all acquisition points in the Tango track fall into the road network of the indoor map of the building, and the adjusted target geographical coordinates of the acquisition starting point and theadjusted target geographical direction corresponding to the 0-degree direction of Tango are obtained; position data of each indoor position point of the building are acquired according to adjustmentresults. The acquisition accuracy of indoor position data can be improved with the method.

The invention relates to an edible mushroom production parameter optimizing system and method, and belongs to the technical field of edible mushroom cultivation. The system comprises a computer, a display connected with the computer, a sensor based on a Modbus communication protocol and a camera, the sensor based on the Modbus communication protocol is an environment sensor, the camera is used for monitoring the growth condition of edible mushrooms, and the sensor based on the Modbus communication protocol and the camera are connected with the computer through the Ethernet; and an edible mushroom growth model analysis system with image processing and machine learning functions is installed in the computer, the system can collect sensor experiment records, the growth vigor of edible mushrooms is observed through the camera, an edible mushroom growth model is generated, and the optimal edible mushroom area and growth environment parameters are searched in the model through a fine segmentation algorithm. The analysis granularity is finer, the result data is more detailed, the acquisition error is small, the accuracy of the experimental analysis result is improved, the manpower is saved, and the cost is reduced.

The invention discloses an LCD three-dimensional printing light equalizing method. The method comprises the following steps: acquiring an initial gray value of a pixel where a first array point coordinate is located under a whiteboard image; obtaining a uniform light compensation difference value corresponding to the initial gray value, interpolating the uniform light compensation difference value into a full-screen compensation difference value by using an interpolation compensation algorithm, and compensating the full-screen compensation difference value to an equal gray value to obtain a full-screen uniform light gray value; obtaining a gray average value of pixels in a central grid where a second matrix point coordinate central matrix point is located under the full-screen uniform light gray value image as a reference gray value; obtaining an average gray value of pixels in a non-central grid where the non-central matrix point is located, and obtaining an optimized compensation difference value between the average gray value and the reference gray value; interpolating the optimization compensation difference value into a full-screen optimization compensation difference value of each pixel of a full screen by using an interpolation compensation algorithm, and compensating the full-screen optimization compensation difference value to the full-screen compensation difference value to obtain a target gray compensation value; and compensating the target gray compensation value to the to-be-printed image data, and loading the to-be-printed image data into an LCD screen for photocuring printing.

The invention discloses a space-based pavement information detection platform multi-sensor synchronous control device and method, and belongs to the field of space-based pavement information detection. The space-based pavement information detection platform multi-sensor synchronous control device includes a micro-controller, a system storage unit, a camera control unit, a level conversion unit, an acousto-optic warning unit, a voltage conditioning unit and a data storage unit, wherein multiple channels of RS-232 communication interfaces are reserved in the level conversion unit; an Ethernet communication interface and multiple channels of UART communication interfaces are reserved in the micro-processor; and a camera shutter interface and a camera synchronous interface are reserved in the camera control unit. The invention also discloses a space-based pavement information detection platform multi-sensor synchronous control method which is implemented based on the above device. The space-based pavement information detection platform multi-sensor synchronous control device and method can realize simultaneous starting and synchronous control of multiple sensors and devices and the data synchronization identity, can furthermore realize synchronous information acquisition at the same time point for the multiple sensors, and have the advantages of high accuracy, high stability, high integrated level and high anti-interference capability.

The invention discloses a sampling device for spirally propelling soil, and relates to the field of soil collection equipment. The sampling device comprises a fixed base, an L-shaped supporting rod, asupporting table, a connecting rod and a drill bit, wherein first hinges are arranged at the three corners above the fixed base, the L-shaped supporting rod comprises an upper supporting rod, a lowersupporting rod and a first hinged seat, a sliding groove is formed in the upper surface of the upper supporting rod, the first hinged seat is hinged to the first hinge, only second hinges are arranged at the three corners of a regular triangle plate body, a second hinged seat is arranged at one end of the connecting rod, the second hinged seat is hinged with the second hinge, a limiting plate ishinged to the other end of the connecting rod, and the limiting plate is clamped in the sliding groove. According to the invention, through sliding fit between the L-shaped supporting rod and the connecting rod, the rocker is continuously rotated to enable the drill bit fixed in the supporting table to be continuously and vertically pushed into soil along with rotation of the rocker so as to conveniently and smooth perform outdoor soil collection work, and errors are not prone to occurring in vertically-downward collected soil so as to improve the outdoor working efficiency.

The invention relates to a phase switching circuit for transformer ratio measurement, which is mainly composed of filter resistor R1, filter capacitors C1~C3, variable capacitor YM1, voltage transformer PT, A / D converter, high voltage phase switching circuit The relay matrix unit JH, the low-voltage phase switching relay matrix unit JL, the voltage dividing circuit and the transformer T are connected. The structure design of the invention is simple and reasonable, and can simultaneously complete the three-phase transformation ratio measurement of the transformer, which solves the large measurement error caused by the asymmetry of the three-phase voltage, ensures the symmetry of the test power supply, and can improve the transformation ratio measurement accuracy and transformation ratio measurement Work efficiency, suitable for popularization and application.

The invention discloses a vehicle-mounted purification device with voice control and a control system and relates to the technical field of vehicle-mounted purification devices. The vehicle-mounted purification device comprises a purifier body, wherein the control system is arranged in the purifier body and comprises a central processing unit, a memory, an identification unit and a collection unit; one end of the central processing unit is respectively connected with the memory and the identification unit; one end of the collection unit is connected with the identification unit; a voice chip, a wireless chip, a gesture processing chip and a microprocessor are respectively integrated in the central processing unit; one end of the microprocessor is also connected with a recording module and a big data processing module; the memory comprises a voice and corresponding instruction library and a gesture and corresponding instruction library. According to the vehicle-mounted purification device, a 3D gesture collector is used for collecting 3D gestures in a specific space area range; the purifier can be controlled to perform different operations according to different gestures of users, such as horizontally sliding to control opening and closing, and sliding up and down to control power.

The present invention discloses a method for realizing synchronization data acquisition based on a passive optical network. Multiple passive optical networks are in one PON host or multiple PON hosts, through the method of clock sharing or clock synchronization, the synchronization among passive optical networks is realized, and a unified clock counter is ensured between an OLT and an OLT. With a passive optical network as a communication media, based on the cyclical synchronization data acquisition time stamp of an OLT reference clock counter, by using ranging and time delay compensation technology, the synchronization data collection by the ONUs of the passive optical networks at the same time is realized, thus the whole network synchronization data collection is realized, and the method has high time transfer precision. The e synchronization data is transferred to the ONU local processor for processing, or according to different application requirements, a suitable communication protocol is customized, after the protocol is completed, the synchronization data is packaged and is uploaded through a fiber network for processing, and the method has the advantages of reliable transmission and high communication bandwidth.

The invention relates to a current acquisition method for a low-speed section of a permanent magnet synchronous motor of a compressor. The method comprises the following steps: 1) amplifying a current signal; 2) acquiring the amplified current signal; 3) restoring a value of the amplified current signal; and 4) averaging various acquired signals which move to right. The adopted technical proposalcompletely solves the problem of poor current acquisition precision of a 180-degree compressor permanent magnet synchronous motor driver at the low-speed section, can improve an A / D sampling resolution in a cost range and reduce acquisition errors of the current signals at the low-speed section, thus improving the acquisition precision.

The invention provides a difference sum circuit in a lateral logger, and the circuit is used for an acquisition circuit on the front end of an acquisition system in a lateral logger. The difference sum circuit in a lateral logger comprises a difference sum output end and N input ends, wherein N is an even number larger than or equal to 2. For N signals respectively input from the N input ends, the difference sum circuit obtains the difference of each two signals, and obtains N / 2 signal differences, and performs summation on the N / 2 signal differences, and outputs the obtained sum from the difference sum output end. The difference sum circuit performs subtraction on each two input signals of the plurality of signals, and then performs summation on the differences of each two signals, so as to reduce error of signal acquisition and improve measuring precision of the front end of the acquisition system.

The invention discloses a bus type temperature measuring device which is characterized in that the device comprises a power supply module, a temperature measurement and conversion module, a control module, and a bus communication module. The power module is used for supplying power to the device. The temperature measurement and conversion module and the bus communication module are connected to the control module. The temperature measurement and conversion module obtains a temperature signal and outputs the temperature signal to the control module. The control module receives the temperature signal, calculates a corresponding temperature value, and outputs the temperature value to the communication module. According to the bus type temperature measuring device of the invention, the sensitivity and precision of temperature measurement are high.