781 results about "Stop signal" patented technology

The present disclosure generally relates to a lens that provides a stop signal for myopia over a substantial portion of a spectacle lens that is being used by a viewer. The present disclosure relates to an apparatus, method, and / or system for applying a stop signal for eye development using a spectacle lens in combination with an array of microlenses. The present disclosure also relates to an apparatus, method, and / or system for modifying incident light through a spectacle lens that utilizes color cues to slow the rate of myopia progression. The present disclosure relates to an apparatus, method, and / or system for applying a stop signal for eye development using a spectacle lens in combination with a refractive optical element and / or a diffractive optical element that provides conflicting or opposing optical signals at wavelengths between 510 nm and 610 nm.

The invention relates to the technical field of machine learning, in particular to a cooling pump optimization algorithm of a central air-conditioning water chilling unit based on a knowledge graph, which comprises the following steps of: acquiring an alignment relationship between a pump start-stop signal and current response time, extracting an action section and a path node sequence to construct a logic sequence, and identifying control signal alternation and direction deviation to extract a path limit number, and screening response delay and a load fluctuation section to correspondingly adjust an identification area. According to the method, behavior mapping between the pump action and the signal time sequence is constructed, alternating signals and direction deviation fragments in a control chain are extracted, a path limiting identifier is generated to be used for restraining control interference, a trigger area is regulated and controlled in combination with matching of load response and an equipment action section, and an accessible path is screened to replace a limited section; the path structure is recombined, instruction chains are sorted, the matching capability of path scheduling and the response collaboration of linkage nodes are enhanced, and the control process is promoted to be kept continuous and stable in a differentiated state.

A radiation imaging system comprises a sensor unit of a radiation imaging device, detecting an incident radiation R irradiated from a radiation generator; an arithmetic unit calculating an accumulated dose of the radiation detected by the sensor unit; and an imaging control unit outputting an irradiation stop signal for stopping the irradiation of the radiation R to the radiation generator when the accumulated dose reaches a threshold or more, wherein the imaging control unit sets the threshold based on a dose rate of the radiation R determined based on a relationship between the accumulated dose and a time, and a delay time from a time of outputting the irradiation stop signal to a time of stopping the irradiation of the radiation of the radiation generator.

The invention provides a drain valve leakage online monitoring method and system based on infrared thermal imaging and deep learning. Comprising the following steps: step 1, collecting a thermal image sequence of a drain valve area in real time through an infrared thermal imager, and simultaneously obtaining a drain valve start-stop signal; step 2, based on a steam trap start-stop signal, synchronously segmenting the thermal image sequence into a working state sequence and a shutdown state sequence according to a working period, and performing dynamic background difference processing on each frame of image to eliminate thermal inertia interference of equipment; 3, calculating a temperature gradient map of each frame of image, generating a temperature gradient mask, and highlighting temperature mutation characteristics of the leakage area; 4, constructing a two-channel time sequence compression network model; 5, evaluating the environmental interference degree based on the dynamic interference index, and dynamically adjusting a leakage judgment threshold value; and step 6, in combination with the leakage region area change rate, the temperature gradient change rate and the sensor data trend, carrying out graded judgment on leakage events, and distinguishing real leakage from background thermal interference through texture feature matching.

Embodiments relate to a level shifter including a first circuit unit configured to output a start signal, a reset signal, and a node charge signal to a gate driver in response to a start control signal and a node charge control signal that are input from a timing controller, a second circuit unit configured to output an output erase signal and a clock shift stop signal in response to the start signal and the reset signal, and a third circuit unit configured to generate a clock signal based on a clock control signal input from the timing controller and output the generated clock signal to the gate driver in response to the output erase signal and the clock shift stop signal that are output from the second circuit unit, a display device including the same, and a method of driving the display device.

The invention discloses a spiral air duct predictive operation and maintenance method and system based on digital twinning, and relates to the technical field of air duct system state monitoring and operation and maintenance, and the method comprises the following steps: deploying a high-frequency acoustic emission AE sensor and a low-frequency vibration acceleration sensor at key nodes of a spiral air duct, and taking a fan start-stop signal and operation power as working condition labels; a high-frequency acquisition mode is automatically triggered, noise reduction processing is carried out, and a multi-mode acoustic vibration original signal data set which is provided with a time sequence and a working condition label and is subjected to preliminary noise reduction is output; the high-frequency acoustic emission AE sensor and the low-frequency vibration acceleration sensor are arranged in the spiral duct, the health state of the thin-wall structure is monitored in real time through the high-frequency acoustic emission technology, weak early-stage fault signals in the duct can be accurately captured and early warning can be given out in the fault germination stage of fretting wear, sealant aging and the like of the spiral duct, and the fault early-warning effect is achieved. Real-time monitoring, early warning and accurate operation and maintenance of the spiral air pipe are achieved.

Method and device for celestial timekeeping that synchronizes independent object-relative cyclic time and displays each unique temporal interval on a single user display system. Multi-celestial cyclic time is displayed based on a user's frame of reference by aligning with recurrent and unique cyclic start / stop signals and the local reference frame timekeeping system. For example, using the Coordinated Universal time (UTC) for a user on Earth to equate the duration of independent cyclic time of Lunar18, Mars24, and so on. The method uses dimensional analysis and equates a single cyclic, non-cyclic (zero-time; start / stop non-dimensional instant of a cycle), and linear continuous time [T] from an observer frame of reference for displaying one or more temporal cycles on the user's device. Each independent cycle is consistent with temporal counts of a whole cycle (equated to SI units) displayed as either a discrete geometric shape (spatiotemporal units) and / or algebraic numbers on the device.

The invention provides a PLC unmanned truss control method and system, and relates to the technical field of truss control, and the method comprises the steps: S1, an upper computer inputs a target coordinate, a PLC generates a three-axis motion track based on an interpolation algorithm, and dynamically adjusts the speed curve of each axis; s2, the upper computer reads real-time state data of the PLC and writes a control instruction into the PLC according to the real-time state data; s3, if the sudden stop signal is detected to be triggered, cutting off the power supply of the servo driver, recording the fault type and the triggering time, generating a log file, and otherwise, entering the next step; s4, the PLC receives a task instruction of the upper computer, and motion parameters are dynamically adjusted according to feedback of the sensor; and S5, controlling each axis to micro-move through the upper computer, and recording the coordinates of the teaching points to generate a reproducible motion sequence. Through cooperative control of the PLC and the upper computer, a centralized management and decentralized execution mode is realized, and the risk of single-point failure is reduced.

The invention relates to a generation power control method, device and equipment of a slope type gravity energy storage system, a storage medium and a program product, and relates to the technical field of gravity energy storage. By adopting the method, the generated power stability of the slope type gravity energy storage system can be improved. The method comprises the following steps: according to power generation request power and unit output power of the slope type gravity energy storage system, determining the current demand number of generator sets; the current generator set is a power generation device comprising two rails; selecting a target number of trucks to be in place on a high-altitude platform of the slope type gravity energy storage system according to the demand number of the current generator set; in response to a power generation starting signal of the slope type gravity energy storage system, according to the truck acceleration control principle, a variable parameter mode is adopted, and the truck is controlled to slide down at wrong time; responding to a power generation stop signal of the slope type gravity energy storage system, and when it is recognized that all the truck slides down and stops on the low-altitude platform of the slope type gravity energy storage system, power generation is ended.

The utility model provides air supply equipment. The air supply equipment comprises an air supply main body, a filter assembly and a detection assembly, the air supply body is provided with an air supply channel. The filtering assembly is installed in the air supply channel. The detection assembly comprises a detection fan blade, a resistance piece and a detection piece. The detection fan blade is rotatably installed in the air supply channel. The resistance piece is used for applying resistance to the detection fan blades to prevent the detection fan blades from rotating. The detection piece is in communication connection with the air supply body and used for detecting whether the fan blades rotate or not. According to the air supply equipment, the filth blockage condition of the filter assembly is judged by detecting whether the detection fan blades rotate or not through the detection part, that is, when the rotation torque borne by the detection fan blades is smaller than the resistance, the detection fan blades stop rotating, the detection part generates a rotation stopping signal and feeds back the rotation stopping signal to the air supply main body, and the air supply main body stops working; and a user is reminded to replace the filter assembly in time, so that the failure of the air supply equipment caused by excessive impurities attached to the filter assembly is avoided, and the reliability and safety of the air supply equipment are improved.

The invention discloses a method for automatically setting a working frequency based on a field radio frequency environment, which relates to the technical field of wireless communication, and comprises the following specific steps of: acquiring field radio frequency environment data in real time through a wireless frequency data acquisition module, and storing the field radio frequency environment data in a database; the data processing module screens non-interference frequency points based on third-order intermodulation interference compatibility calculation, the working frequency of the receiver and the working frequency of the transmitter are dynamically adjusted through the equipment control module, and the database, the data processing module and the equipment control module cooperate to achieve automatic frequency switching. A receiver in the method is provided with a standby receiving sub-module, when it is detected that a current frequency point is interfered, the current frequency point is automatically switched to a standby frequency point, stable operation of a system is ensured, the transmitter synchronizes the frequency with the receiver through a communication protocol in a speaking state, signal transmission is stopped in a mute state, environment interference can be monitored in real time, manual intervention is not needed, and the method is suitable for popularization and application. Manual frequent manual operation for frequency adjustment is avoided, and the anti-interference capability of a wireless communication system is remarkably improved.

A radiographic imaging system includes a control apparatus configured to control a radiation generation apparatus, and a radiographic imaging apparatus including a sensor unit configured to detect radiation emitted from the radiation generation apparatus and a communication unit configured to transmit, to the control apparatus, an irradiation stop signal to stop the radiation generation apparatus from emitting radiation based on a dose of the radiation detected by the sensor unit, wherein the communication unit transmits, to the control apparatus, a plurality of control signals as one set, each of the plurality of control signals including the irradiation stop signal, and wherein the control apparatus stops generation of radiation from the radiation generation apparatus based on the plurality of control signals.

The invention relates to the field of equipment control, in particular to a water tank penetrating air source self-adaptive adjusting method and system. The method comprises the following steps: acquiring a finishing mill start-stop signal and a wire rod head position signal in real time; dynamically calculating the residual distance from the head of the wire rod to the penetrating water tank, and generating a dynamic delay opening threshold value; the electromagnetic valve is controlled to open the pneumatic ball valve in a sectional manner; monitoring the covering length of the wire rod and converting the covering length into an equivalent gas resistance value; a dynamic pressure compensation amount is generated through a pressure closed-loop controller; the opening degree of the pneumatic ball valve is adjusted accordingly; when the finishing mill stops, the pneumatic ball valve is triggered to be closed, and a gradient pressure relief turn-off program is executed if necessary. By means of the distributed sensor array and the multi-mode recognition neural network, real-time accurate monitoring and analysis of the operation state of the pump set are achieved, dependence of post personnel is reduced, and the automation degree and stability are improved. And by dynamically optimizing the control strategy, the pump set system operates efficiently, energy waste is reduced, the energy utilization efficiency is improved, and the production cost is reduced.

The invention relates to the technical field of computers, and discloses a method for process management, which comprises the following steps: under the condition of meeting a low power consumption condition, sending a low power consumption control message to an event management process so as to enable the event management process to send a stop signal; and under the condition that the stop signal is received, the application process enters a low-power-consumption state. By receiving the stop signal sent by the event management process, the running state of the application process is switched, so that the application process enters the low-power-consumption state, power consumption management on the application process can be realized, and the power consumption of the system is reduced. The invention furthermore discloses a process management apparatus, a computing device and a computer readable storage medium.

The invention belongs to the field of artificial intelligence and energy power system cross control, and particularly relates to a coal-fired unit fused salt combined frequency modulation control method and device based on deep reinforcement learning. According to the method, a deep reinforcement learning agent model is constructed, and boiler fuel quantity, steam turbine valve position, fused salt heat charging and discharging power and pump starting and stopping signals are dynamically output based on state space vectors; and tracking precision, thermal stress, emission and coal consumption indexes are fused through a multi-target reward function, and strategy autonomous optimization is realized by adopting a double-Q network, experience playback and target network delay updating mechanism. After deployment, the boiler, the steam turbine and the molten salt unit can be coordinated on line, power space-time decoupling and closed-loop cooperation are achieved, on the premise that main steam parameter stability and equipment safety are guaranteed, the frequency modulation response speed and precision are remarkably improved, the thermal fatigue risk is reduced, and the unit economy and the power grid adaptability are enhanced. And a flexible adaptive adjustment capability is provided for a high-proportion new energy power system.

The invention relates to a gamma sector distinguishing method for a near-bit, and relates to the technical field of oil-gas exploration and development. According to the method provided by the embodiment of the invention, the angular difference problem of the near-bit instrument is automatically processed through the processing of the initial angular difference, the free configuration of the angular difference is realized, and if the mounting position is changed, the trouble in the dismounting process can be reduced. And the difference value between the gravity tool face and the magnetic tool face is collected through an external pump stopping signal to serve as the calibration offset. Meanwhile, the theory that the components of the magnetoresistive sensor in the positive and negative directions of the standard magnetic field are opposite numbers is used, and a certain magnetoresistive component is linear accumulation of all axial components in the standard magnetic field. And respectively corresponding component coefficients can be calculated through composite operation between standard positions. The calibration precision is improved, errors caused by component differences or component installation errors in the installation and debugging process are reduced, the influence on the magnetic tool face is reduced, and the linearity and precision of the tool face are improved.

The invention relates to the technical field of integrated circuit testing, and discloses a method and equipment for scanning a voltage and current flip point of a chip, and the method comprises the following steps: an upper computer completes parameter configuration and wave table loading and then sends a starting instruction, a global synchronization unit generates a synchronization signal, and the synchronization signal is sent to a chip; the random waveform generator is started in parallel for scanning, the trigger unit is started for monitoring, the internal counter is started for timing, when the trigger unit monitors overturning, a stop signal is sent, the global synchronization unit latches a count value immediately, and finally, the upper computer reads the count value and calculates an overturning point value in combination with a wave table rate and a clock period. According to the invention, the global synchronization unit is used for coordinating the parallel hardware architecture of the arbitrary waveform generator and the trigger unit, so that the continuous scanning of the excitation signal and the real-time monitoring of the response signal can be autonomously operated on the hardware level, and the overall time consumption of a single flip point test is greatly shortened.

A CMOS integrated chip (1) comprising a time-to-digital converter, TDC, circuit (2) for light detection and ranging, lidar, applications, comprises a start channel (10) comprising an input (11) for a start signal (ST), and at least one stop channel (20, 30) comprising an input (21, 31) for a stop signal (SP). It further comprises a TDC element (40) for each of the start and stop channels (10, 20, 30), wherein the TDC element (40) is configured to store respective counts when triggered by the start signal (ST) or the stop signal (SP), respectively. It further comprises a calculation unit (50) coupled to each TDC element (40) and configured to determine a time difference (ΔT) associated with the start signal (ST) and the stop signal 8SP) based on the counts, and an instruction driven communication interface (60) comprising at least two bidirectional data pins (63, 64). Further, a time-of-flight measurement system and a method of operating the CMOS integrated chip (1) is provided.

The invention relates to the technical field of pollution source supervision, and discloses a pollution source off-site supervision method and system based on big data, and the method comprises the steps: building a dynamic verification rule library through coupling the operation beat data of enterprise key equipment and the total power consumption fingerprint data, and comparing the matching degree between the actual energy consumption and the expected mode in real time and generating a process credibility index. According to the invention, conversion from traditional pollution discharge data verification to production process stability verification is realized, and an unforgeable supervision trust mechanism is constructed through the physical relevance between the equipment start-stop signal and the power utilization characteristic; and meanwhile, the judgment accuracy under the extreme working condition is ensured by utilizing environmental parameter dynamic compensation and micro-differential pressure bypass verification, and finally a quantifiable accumulation enterprise environmental protection credit evaluation system is formed.

The invention relates to the technical field of image data processing, in particular to a suspension spring cold roll forming precision online detection system based on image recognition, which comprises an image acquisition and preprocessing module, a spring morphology characterization module, a spring image reconstruction module, a three-dimensional image alignment module and a dynamic monitoring module. The image acquisition and preprocessing module dynamically acquires a multi-angle image of the spring and determines a target area; the spring morphology characterization module performs morphology analysis, establishes a first morphology graph and extracts two-dimensional features; the spring image reconstruction module adopts Faster R-CNN to generate a two-dimensional mask, reconstructs a three-dimensional point cloud through a multi-angle image and extracts key nodes; and the three-dimensional image alignment module aligns the three-dimensional data with the standard model, and calculates the precision deviation to carry out qualification judgment. And the dynamic monitoring module can perform periodic execution, and triggers a stop signal to realize closed-loop control when the precision reaches the standard. In addition, the system adopts a dynamic deviation threshold, and the detection efficiency is improved according to layered processing of spring types.

The utility model provides an oil-electricity hybrid power control system, which is suitable for a vehicle and comprises a storage battery, an integrated starter generator coupled to the engine; the hybrid power controller is used for receiving at least one of an accelerator opening degree signal, a brake signal, an engine rotating speed signal, a storage battery voltage signal, a starting signal and an idling stop signal and determining whether to perform one of a starting mode, a charging mode, an auxiliary power judgment mode, a regenerative charging judgment mode and an idling stop judgment mode according to the at least one of the accelerator opening degree signal, the brake signal, the engine rotating speed signal, the storage battery voltage signal, the starting signal and the idling stop signal; when the hybrid power controller is in a charging mode, the integrated starter generator is driven by the engine to generate and output a first AC voltage to the hybrid power controller, so that the hybrid power controller performs switching voltage regulation control according to the first AC voltage to generate output power to charge the storage battery and the vehicle load.

The present disclosure relates to devices, systems and / or methods for myopia control. The present disclosure generally relates to a lens that provides a stop signal for myopia on a substantial portion of the spectacle lens being used by a viewer. The present disclosure relates to devices, methods and / or systems for applying a stop signal for eye development using ophthalmic lenses in combination with microlens arrays. The present disclosure also relates to devices, methods and / or systems for modifying incident light through spectacle lenses that utilize color cues to slow down the rate of myopia progression. The present disclosure relates to devices, methods and / or systems for applying a stop signal for eye development using spectacle lenses in combination with refractive and / or diffractive optical elements that provide conflicting or opposition optical signals at wavelengths between 510 nm and 610 nm.

The invention discloses a display module, a driving method thereof and a display device. The display module comprises an initial signal line, a first control signal line and a gate driving circuit, the initial signal line is used for providing an initial signal; the first control signal line is used for providing a stage transmission stop signal; the gate drive circuit comprises a plurality of shift register circuits in cascade connection, the shift register circuits are connected with a first control signal line, and the first shift register circuit of the plurality of shift register circuits is connected with an initial signal line; the shift register circuit is used for generating a scanning signal under the condition that the initial signal is received or the scanning signal output by the previous shift register circuit is received; and the shift register circuit is also used for stopping generating the scanning signal under the condition that the cascade transmission stop signal is received. According to the invention, the display panel can adopt different refresh rates in different display areas, so that the power consumption of the display panel is reduced.

The invention discloses an implementation method of a high-precision time-to-digital converter, and relates to the technical field of time mode signal processing. The delay chain comprises a Start signal channel and a plurality of Stop signal channels, each delay chain corresponds to one channel, each delay chain is formed by cascading a circuit with a delay function as a delay unit, the chain structure is divided into an integral chain and a differential chain, the integral chain is that one channel corresponds to one independent delay chain, and the differential chain is that one channel corresponds to one independent delay chain. The difference chain regards two delay chains corresponding to two adjacent channels as a group, and the time difference of signals reaching the input ends of the two delay chains is maintained for 1 / 2 of the delay duration of a single-stage delay unit through a back-end constraint physical layout wiring rule, so that difference is formed. According to the invention, the maximum time resolution of TDC can reach about 12ps, and the test precision is lt; and the dynamic range is about 67 ms, so that high-precision time interval measurement capable of being dynamically calibrated is realized.

The invention relates to a double-air-path control method, device and equipment for a binding system.The method comprises the steps that when it is detected that a human limb is placed in a cuff body support, a laminated air bag is inflated through a first air path, and when the obtained first air bag pressure value of an inner-layer air bag meets a first preset air bag pressure value, the first air bag pressure value of the inner-layer air bag meets a second preset air bag pressure value; generating a laminated airbag inflation stopping signal; when an inflation stopping signal of the laminated air bag is detected, inflation of the laminated air bag is stopped, and a current function instruction of the binding system is obtained; when the current function instruction is a blood pressure measurement instruction, the inner-layer air bag is inflated through a second air path, and when the obtained second air bag pressure value of the inner-layer air bag and the obtained pulse fluctuation value of the human limb meet the preset blood pressure measurement requirement, the laminated air bag and the inner-layer air bag are exhausted; compared with the prior art, according to the technical scheme, the automation degree of binding can be achieved, and the accuracy of follow-up measurement and the user experience are improved.

The invention discloses an air conditioner energy demand control method and system, and the method comprises the steps: obtaining a start-stop signal, carrying out the initialization processing of a compressor based on the start-stop signal, and obtaining the nominal performance of an indoor unit and the single rotation speed of the compressor; the real-time environment temperature is obtained, and a first indoor unit function demand value is determined based on the real-time environment temperature, indoor unit nominal performance, the compressor single rotating speed and a preset mapping rule; obtaining the running state of the compressor, and obtaining a second indoor unit energy demand value based on a preset energy demand prediction model, the real-time environment temperature and the running state of the compressor; the energy demand prediction model is constructed based on a machine learning algorithm and historical operation data; performing weighted fusion on the first indoor function demand value and the second indoor function demand value to determine a target indoor function demand value; and the target rotating speed is calculated based on the target indoor unit energy demand value, a control instruction is generated based on the target rotating speed, and air conditioner energy demand control is completed based on the control instruction, so that the air conditioner system dynamically responds to the indoor thermal load and accurately adjusts the indoor thermal load.

The invention discloses a device and a method for automatically measuring the depth of a concrete surface, and relates to the technical field of methods for measuring the depth of the concrete surface. The measuring assembly comprises a winding drum, a position sensing switch and a depth measuring part; a depth measuring piece is arranged on the winding drum; the position sensing switch is positioned below the winding drum; when concrete surface depth measurement begins, the position sensing switch is pressed to be in an on state; when the depth measuring piece is in contact with the concrete surface, the pressure applied to the position sensing switch disappears, and the position sensing switch is switched to be in an off state; the depth measuring unit calculates a depth value corresponding to the time from the start of the measurement to the reception of the measurement stop signal. The device can replace manpower to carry out concrete drop hammer measurement, time and labor are saved, convenience and rapidness are achieved, and the measurement efficiency and accuracy can be remarkably improved.

The invention discloses an automatic identification and inspection system and method for delivered products. The system comprises an inspection machine, a conveying mechanism, a decoding module and an IO control module. The inspection machine is used for acquiring and displaying corresponding order information according to the code scanning information of the delivery order; the conveying mechanism is used for starting operation according to a button instruction so as to convey a plurality of to-be-detected products; the decoding module is used for capturing the bar code of each to-be-detected product conveyed on the conveying mechanism and decoding the bar code so as to obtain a to-be-detected bar code corresponding to each to-be-detected product; the inspection machine is also used for obtaining an inspection result according to the to-be-inspected bar code corresponding to each to-be-inspected product and the order information transmitted by the decoding module, storing the inspection result, and sending a stop signal to the IO control module according to the inspection result; the IO control module is used for controlling the conveying mechanism to stop running according to the stop signal. According to the invention, whether the distribution of the delivery order is complete can be automatically checked, delivery errors caused by human factors are avoided, and the delivery efficiency is improved.

The invention relates to a two-step time-to-digital converter and a method thereof, a phase-locked loop and an analog-to-digital converter. The method comprises the following steps of: performing N1-stage delay on a reference signal rs in sequence, and performing coarse quantization on the delayed signal of each stage relative to a feedback signal fb; when the two signals are different, after the time t1 is delayed, the first arriving signal is selected as a time starting signal Start and the fb is delayed for the time t1 and then serves as a time stopping signal Stop in the delayed period, and when the two signals are the same, the rs is selected as Start after the time t2 is delayed, and the fb is selected as Stop after the time t2 is delayed; performing fine quantization formation on the Start and the Stop; and decoding the code into n1-bit high-bit binary codes and decoding the code into n2-bit low-bit binary codes. The technical problem that the area and power consumption of an existing two-step TDC are increased due to the fact that the number of logic gates of a selector is greatly increased along with the increase of coarse quantization bits is solved.

The invention relates to the technical field of safety control, in particular to an elevator safety monitoring method which comprises the following steps: 1, acquiring a regional ground image, acquiring the position of an elevator and marking in the regional ground image; 2, a target position where the elevator needs to go is obtained, moving routes between the current position and the target position are constructed, route recommendation values of all the moving routes are calculated, and the moving route with the maximum route recommendation value is selected as a first route; thirdly, the first route serves as the advancing route of the elevator, and the moving speed of the elevator is limited; 4, constructing an analysis area; obtaining a ground image in the analysis area, carrying out graying processing, and calculating a first influence value based on the number of different gray values; light irradiation is conducted in the analysis area, a second influence value is calculated, and when the first influence value is larger than or equal to the influence threshold value or the second influence value is larger than or equal to a preset blocking threshold value, a stop signal is generated.