32results about How to "Simple detection algorithm" patented technology

The invention provides a laser high-temperature liquid height measurement and control system. The system comprises a laser transmitter used for transmitting laser beams, a laser receiver used for receiving laser beams, a driving unit used for driving the laser transmitter and the laser receiver to rotate synchronously, a controller used for analyzing electric signals, calculating the liquid level height and change rate of high-temperature liquid according to a formula, and sending out warning information, and a liquid level control pump used for regulating the level of high-temperature liquid in a high-temperature container. Laser beams resistant to high temperature and interference are used as a measurement light source, the liquid level height and liquid level height change rate of high-temperature liquid can be measured in real time in a high-temperature environment, and the level of high-temperature liquid is regulated in real time. The invention further provides a laser high-temperature liquid height measurement and control method. The method comprises the steps of signal zero setting, liquid level measurement, liquid level regulation and the like and overcomes the defects of existing detection methods that adopted algorithms are complicated and detection precision is low.

The invention belongs to the field of beauty care and provides a skin color detection method and device and hair removal equipment. The skin color detection method includes that white light is emitted to target-area skin if the skin is detected to be close to the hair removal equipment, light information of target light of the white light subjected to diffuse reflection of the target-area skin is then acquired, and skin color information of the target-area skin is determined according to the light information of the target light. The skin color information of the target-area skin can be determined according to the light information of the target light emitted to the target-area skin and subjected to diffuse reflection of the target-area skin; compared with an existing skin color detection system, the skin color detection method has the advantages that the detection algorithm is simple, and cost of the skin color detection system can be lowered.

The invention relates to a burst MSK direct spread communication synchronous detection device and method, which belongs to the technical field of signal detection and solves the problems of complex algorithm and low detection efficiency of the existing detection device. The device includes a signal preprocessing module, which obtains digital intermediate frequency signals including multiple synchronous sequences based on analog radio frequency signals; multiple synchronous sequence detection modules, which are respectively used to detect corresponding synchronous sequences; and obtains digital intermediate frequency signals based on digital intermediate frequency signals through multiple filters. Multiple numerical sequences, based on the synchronous symbol corresponding to the synchronous sequence, extract and select the corresponding numerical value from multiple numerical sequences to calculate and obtain the time domain correlation value, and then judge whether the digital intermediate frequency signal contains the synchronous sequence; synchronous pulse joint detection The module determines whether there is communication information in the digital intermediate frequency signal and the position of the communication information based on the number and time of the detected synchronization sequences. The synchronization detection device has the advantages of simple algorithm, small calculation amount and high detection efficiency.

The invention relates to the technical field of traffic detection and discloses a method for detecting a fire accident on an expressway or in a tunnel based on a video detection technology. The method comprises the following steps: extracting a picture from an obtained video according to a preset frame rate; utilizing the obtained picture to establish a tunnel background model; extracting a foreground target image from the picture with a background differentiating method; dividing the picture into a background part and a foreground part, and respectively updating the background part and the foreground part in different updating rates; analyzing the foreground target of the image in a detection period, and judging whether a suspected static target exists or not according to time sequence information; and if the suspected static target exists, determining a suspected flame region in combination with the moving and static features of flames, and finally analyzing the suspected flame region of a sequentially extracted image according to flame judging rules and judging whether the fire accident exists or not. The method has the advantages of simple detection algorithm, small calculated amount, capability of shortening processing time, capability of improving detection efficiency, and capability of reducing the influence of the complicated scenic illumination condition of the tunnel on fire detection.

The invention discloses a fault-tolerant proportional coordinated control method of a multi-motor servo drive system with a coupling control structure. The fault detector of the motor servo control system is used to detect the fault of the motor and its electric drive module in real time, based on the coupling control structure of the multi-motor system , design a motor coordination compensator switching logic module that fuses fault detection information, and improve the coordination compensator working mode. When a motor control system fails, the output path of its coordination compensator is cut off, so that the multi-motor system is converted from a coupled control structure to a master-slave control structure. In the master-slave control structure, the master motor is the faulty motor, and the slave motor is the normal motor, so as to ensure that the proportional relationship between the output of each motor in the multi-motor servo drive system remains unchanged, and realize the fault tolerance function; when the faulty motor returns to normal, it is connected by the fault logic decision-making module The motor coordinates the output path of the compensator, and the whole system returns to the original coupling control structure, and the proportional relationship of the output of each motor remains unchanged.

The invention belongs to the field of electric power system and relates to a polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation. The polyphase circuit general harmonic detection method basically includes the general harmonic voltage detection algorithm and the general harmonic current detection algorithm. The general harmonic voltage detection algorithm includes the voltage instantaneous symmetrical component transformation algorithm, the voltage sine algebraic transformation algorithm, the voltage average filtering algorithm, the voltage initial phase algorithm, the voltage reconstruction algorithm and the general harmonic voltage computational algorithm. The general harmonic current detection algorithm includes the current instantaneous symmetrical component transformation algorithm, the current cosine algebraic transformation algorithm, the current average filtering algorithm, the current initial phase algorithm, the voltage-current phase difference algorithm, the current reconstruction algorithm and the general harmonic current computational algorithm. The poly circuit general harmonic detection method is simple in phase locking, strong in real-time effect, high in accuracy, simple in algorithm, easy to implement, economic, wide in application range and the like.

The invention discloses a license plate correction method, device and a video acquisition device, wherein the license plate correction method includes: acquiring an image to be detected and a target detection and recognition model based on a convolutional neural network; The target detection and recognition model of the network detects four corner point information of the target license plate in the image to be detected; the corner point information includes: square area, corner point category and confidence of the corner point; according to the four corner point information of the target license plate corner point information, and perform license plate correction on the target license plate in the image to be detected. The technical scheme of the invention can accurately describe the various deformations on the plane graph caused by the rotation of the license plate in the three-dimensional space, and the deformed license plate in the three-dimensional space can be corrected by locating the information of the four corner points, and it is affected by the change of the license plate number The impact of the method is small, the detection rate is high, the mispicking rate is low, the recognition rate of the corner point category is high, and the positioning is accurate.

The invention relates to a detecting circuit for insulating resistance to ground of power cells, belonging to the field of power cells application. The circuit comprises a voltage sensor, a light-coupled MOS tube, a single chip, a resistor and a power supply, wherein a resistor R11 is connected to a 1st end of a voltage sensor N1; a 3rd end of the N1 is connected to the power supply -VCC; a 5th end of the N1 is connected to the power supply VCC; a 4th end of the N1 is connected to the single chip by a resistor R12; a resistor R21 is connected to a 1st end of a voltage sensor N2; a 2nd end of the N2 is connected to a 8th end of the light-coupled MOS tube N4; a 3rd end of the N2 is connected to the power supply -VCC; a 5th end of the N2 is connected to the power supply VCC; a 4th end of theN2 is connected to the single chip by grounding; both the 6th and 7th ends of the N4 are connected to point G by grounding; a 5th end of the N4 is connected to a 1st end of N3 by a resistor R31; a 2nd end of the N3 is connected to a B point on negative bar of the power cells to be detected; a 3rd end of the N3 is connected to the power supply -VCC; a 5th end of the N3 is connected to the power supply VCC; a 4th end of the N3 is connected to the circuit by a resistor R32; both the 1st and 3rd ends of the N4 are connected to the power supply VCC by a resistor R41; the 2nd and 4th ends of the N4are respectively connected to the digital outlets P0.1 and P0.2. The circuit of the invention has the advantages of simple structure, high detecting precision, etc.

The invention provides a high-resolution light guide plate image defect detection method, including the following steps: the original picture of the light guide plate is collected, a light guide plateoriginal image is enhanced, a maximum inter-class variance method is used for threshold segmentation of that image enhancement image of the light guide plate, the connected domain is obtained from the threshold processing display graph, a light guide plate whole connected region is extracted with that lar area, a maximum area extraction graph is transformed into a shape, a light guide plate imageshape conversion map is adjusted in a gray value, the gray value adjustment map is partitioned, Gaussian bias is applied to the partition display image of the light guide plate, a mask process is performed on the Gaussian partial derivative display image, Fourier positive transform is carried out on the mask processing display graph, a sinusoidal shape band-pass filter is established, inverse Fourier transform is carried out on the convolution display graph, threshold treatment is carried out on the inverse Fourier transform display graph, the connected domain is obtained on the second threshold treatment display graph, defects are extracted on the second connected domain display graph, and defects are displayed.