JP6046287B1 - Elevator system - Google Patents

Abstract

In an elevator car, the image quality of a photographed image near an entrance is appropriately improved. An elevator system according to an embodiment includes a camera that is installed at an upper part of a car entrance and that takes a picture of the vicinity of a door in the car room and sets the car room and a landing area as an imaging range. When analyzing the image and managing the state near the door, automatic exposure adjustment is performed when the door is fully closed, and exposure is performed with a fixed exposure value based on the exposure value when the door is fully closed. Adjustment is performed, automatic exposure adjustment is performed in the fully opened state, and exposure adjustment is performed with a fixed exposure value based on the exposure value in the fully opened state during the door closing operation. [Selection] Figure 4

Description

  Embodiments described herein relate generally to an elevator system that manages opening and closing of an elevator door.

  In elevators, a camera for surveillance is attached to the upper part of the entrance of the car, and the vicinity of the entrance is photographed with this camera, and the captured images are processed to determine the state of the passengers. Yes.

JP 2005-179030 A JP 2014-47015 A

  As described above, in the elevator, the state of the passenger is determined from the captured image near the entrance of the car. However, it is difficult for the adjustment function provided in the camera to appropriately cope with environmental changes when the door is opened and closed, and the safety measures at the time of opening and closing the door are affected by the deterioration of the image quality of the captured image.

  The problem to be solved by the present invention is an elevator that can appropriately improve the image quality of a photographed image in the vicinity of the entrance of a passenger car, thereby making it possible to further improve safety measures when opening and closing the door. Is to provide a system.

  An elevator system according to an embodiment includes a camera that is installed at the upper part of a car entrance and that takes a picture of the vicinity of a door in the car room and uses the car room and a landing as an imaging range, and performs analysis processing on the image taken by the camera In this system, the state in the vicinity of the door is managed, and an exposure value is measured for a designated detection area in the imaging range, and exposure adjustment is performed so that the measured exposure value becomes an appropriate exposure value. When the position of the door is in the fully closed state and the door opening operation, the detection area is designated as the car interior side of the imaging range, and when the door is in the fully open state and the door closing operation, the detection area is set to the imaging range. The above-mentioned exposure adjustment is performed by designating on the landing side. Here, automatic exposure adjustment is performed when the door is fully closed, exposure adjustment is performed with a fixed exposure value based on the exposure value when the door is fully closed, and automatic exposure adjustment is performed when the door is fully open. It is assumed that exposure adjustment is performed with a fixed exposure value based on the exposure value in the fully opened state during the closing operation.

It is a block diagram which shows the structure of the elevator system which concerns on embodiment. It is a figure for demonstrating the door opening / closing operation | movement at the time of the platform arrival of the car shown in FIG. It is a block diagram which shows the structure of the camera shown in FIG. It is a figure which shows the imaging range and exposure detection area of the camera shown in FIG. It is a flowchart which shows the flow of exposure adjustment of 1st Example of the camera shown in FIG. It is a flowchart which shows the flow of exposure adjustment of the 2nd Example of the camera shown in FIG.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an elevator system according to the present embodiment. The “elevator” mentioned here basically means a “car”.

  In the figure, 11 is a car control device, and 12 is a car. The car control device 11 is connected to an elevator control device (not shown), and transmits / receives various signals such as a hall call and a car call to / from the elevator control device. The “call to hall” is a call signal registered by operating a hall call button (not shown) installed at a hall on each floor, and includes information on a registered floor and a destination direction. The “car call” is a call signal registered by operating a destination call button (not shown) provided in the passenger compartment of the car 12, and includes information on the destination floor.

  In addition, the car control device 11 includes a door opening / closing control unit 111. The door opening / closing control unit 111 controls the door opening / closing of the car door 13 when the car 12 arrives at the landing. Specifically, the door opening / closing control unit 111 opens the car door 13 when the car 12 arrives at the landing, and closes the door after a predetermined time has elapsed. However, when a person who intends to get on is detected by the user detection process of the image processing device 16 while the car door 13 is open, the door opening / closing control unit 111 prohibits the door closing operation of the car door 13. Keep the door open. When a person who is willing to get on the vehicle is detected while the door is closed, the door closing operation is interrupted and the door is opened again.

  In addition, at the landing on each floor, a landing door 14 is installed at the arrival entrance of the car 12 so as to be freely opened and closed. The landing door 14 engages with the car door 13 when the car 12 arrives at the landing and opens and closes. The power source (door motor) is on the car 12 side, and the landing door simply opens and closes following the car door 13. In the following description, it is assumed that when the car door 13 is opened, the landing door 14 is also opened, and when the car door 13 is closed, the landing door 14 is also closed. FIG. 2 shows the door opening / closing operation when the car 12 arrives at the landing.

  Here, in the present embodiment, a monitoring camera 15 is installed in the curtain at the upper part of the entrance / exit of the car 12, for example, the upper part of the car door 13. The camera 15 can capture several frames of images per second, such as an in-vehicle camera. When the car 12 arrives at the landing on each floor and opens the door, and when the door is closed during getting on and off, the camera 15 photographs the landing on each floor including the car room near the car door 13 (FIG. 4). reference).

  Each image (video) taken by the camera 15 is analyzed and processed in real time by the image processing device 16. The image processing device 16 extracts, for example, a moving object, for example, a person (in this case, an elevator user) from each image, tracks the movement of the person, detects completion of getting on and off, and detects that the door is pulled in when the door is opened. Analytical processing is performed, and safety measures such as warning instructions are taken as necessary. Here, the image processing device 16 is provided independently of the car control device 11, but the function of the image processing device 16 may be mounted in the car control device 11.

  FIG. 3 is a block diagram showing the configuration of the camera 15. FIG. 3A shows the overall configuration, and FIG. 3B shows a specific configuration of the control unit. In FIG. 3A, 151 is an imaging unit, 152 is an image memory, 153 is an exposure amount measuring unit, and 154 is an exposure control unit.

  Although not shown in detail, the imaging unit 151 includes an optical lens, an image sensor, and an electronic shutter. The optical lens forms an image on the image sensor with pan focus, and an exposure time is adjusted by the electronic shutter. Every time the image is digitized. The image signal obtained here is temporarily stored in the image memory 152, read out in units of frames, and sent to the image processing device 16.

  In response to an instruction from the exposure control unit 154, the exposure amount measurement unit 153 reads an image of the designated car room or landing detection area and measures the exposure amount. The exposure control unit 154 sets the door closed state of the car door 13 to the initial state, notifies the exposure amount measuring unit 153 to expose a detection area in the car room registered in advance, and acquires the exposure amount measurement value of the area. To do. Then, an exposure time at which the acquired exposure value measurement value becomes an appropriate value is calculated (a table reference method created in advance may be used), and the electronic shutter of the imaging unit 151 is controlled based on the exposure time. Hereinafter, this series of processing is referred to as exposure adjustment.

  When the car control device 11 instructs the car door 13 to open while the car door 13 is fully closed, the exposure control unit 154 continues to detect the car room until the car door 13 is fully opened. The exposure amount is measured, and exposure adjustment is performed based on the measured value.

  When the car control device 11 issues a door closing instruction to the car door 13 with the car door 13 fully opened, the exposure control unit 154 continues to detect the detection area on the landing side until the car door 13 is fully closed. The exposure amount is measured, and exposure adjustment is performed based on the measured value.

  Specifically, as shown in FIG. 3B, the exposure control unit 154 loads an exposure adjustment program and executes arithmetic processing, a CPU (Central Processor Unit) 21, a program executed by the CPU 21, registration information ( ROM (Read Only Memory) 22 for storing detection area, exposure time reference table, etc., RAM (Random Access Memory) 23 as a work area for program execution of CPU 21, input of registration information, and measurement of exposure amount An input / output (I / O) interface 24 is provided for outputting an electronic shutter drive signal corresponding to an input, a car door opening instruction input, and an exposure time for setting the measured exposure amount to an appropriate value.

(First embodiment)
In the above configuration, the exposure adjustment process of the first embodiment will be described below with reference to FIGS. FIG. 4 is a diagram showing an imaging range of the camera 15 and a spot position (detection area) for performing exposure adjustment, and FIG. 5 is a flowchart showing a flow of exposure adjustment processing of the camera 15 according to the first embodiment.

  In general camera exposure settings, the entire image on the screen is adjusted to have an optimum brightness. For this reason, when the camera is used for shooting with an elevator, the imaging range changes during the door opening and closing operation, and the brightness increases rapidly, resulting in overexposure and underexposure in the image range to be detected. It becomes impossible. Therefore, in this embodiment, the exposure adjustment is switched between automatic and fixed depending on the position of the door.

  In FIG. 4, 13a and 13b indicate car doors, and 14a and 14b indicate landing doors. That is, the imaging range of the camera 15 includes the car door and its vicinity when the door is closed, and the landing side when the door is open. In order to monitor the camera 15 being pulled into the door pocket during the door opening operation, a detection area A is designated in the vicinity of the entrance / exit of the car room shown in FIG. sign up. In addition, during the fully open and door close operation, the detection area B is designated and registered in the vicinity of the entrance / exit of the landing shown in FIG.

The camera 15 executes the exposure adjustment process shown in FIG.
First, in the fully closed state of the car door 13 at the start of operation, the detection area A in the image in the car room is specified, the exposure amount of the detection area A is measured, and automatic adjustment to appropriate exposure based on the measurement result (Step S1). At this time, in the exposure adjustment, for example, an appropriate exposure time is obtained from the measured exposure amount, and the electronic shutter is driven and controlled in accordance with the exposure time. At this time, the average exposure value in the fully closed state is calculated as a fixed exposure value.

  Here, it waits for the door opening start by the door opening instruction input (step S2), and after the door opening starts, exposure adjustment is performed based on the average exposure value of the detection area A in the car room calculated in step S1 (step S3). . At this time, a sudden increase in exposure occurs due to the amount of light from the hall brighter than the car room, but the exposure is adjusted based on the average exposure value when the door is fully closed, reducing over-exposure in the car room image when the door is opened. can do.

  Subsequently, it is determined whether or not the door is fully opened (step S4). When the door is fully opened, the detection area B of the landing image is designated, the exposure amount of the detection area B is measured, and an appropriate value is determined based on the measurement result. The exposure is automatically adjusted (step S5). At this time, the average exposure value in the fully opened state is calculated as a fixed exposure value.

  Here, it waits for the door closing start by the door closing instruction input (step S6), and after the door closing starts, exposure adjustment is performed based on the average exposure value of the landing detection area B calculated in step S5 (step S7). At this time, a sudden drop in the exposure amount due to the amount of light from the car room darker than the landing occurs, but the exposure adjustment is based on the average exposure value when fully opened, so the blackout of the image during the door closing operation can be reduced. it can.

  Subsequently, it is determined whether or not the door is fully closed (step S8). If the door is fully closed, the process returns to step S1 and a series of processes are repeatedly executed.

  As described above, in this embodiment, the exposure value is acquired by performing automatic exposure for a predetermined time during full closing and full opening, and the average exposure value is calculated as a fixed exposure value. After a predetermined time has elapsed (during the door opening operation and the door closing operation), the exposure value is fixed to an average value, and exposure adjustment is performed based on the average exposure value. Thereby, the influence by the brightness of an imaging range can be reduced.

  The exposure value used during the door closing operation is a value that is higher (slightly brighter) than the calculated average value in consideration of people coming in and out. However, if the average value exceeds the threshold value (that is, if the average value is overexposed), a value lower (a little darker) than the average value is used.

(Second embodiment)
The exposure adjustment process of the second embodiment will be described below with reference to FIG. Refer to FIG. 4 for the imaging range of the camera 15 and the spot position (detection area) where exposure adjustment is performed.

In this embodiment, the camera 15 executes the exposure adjustment process shown in FIG.
First, in the fully closed state of the car door 13 at the start of operation, the detection area A in the image in the car room is specified, the exposure amount of the detection area A is measured, and automatic adjustment to appropriate exposure based on the measurement result (Step S11). At this time, in the exposure adjustment, for example, an appropriate exposure time is obtained from the measured exposure amount, and the electronic shutter is driven and controlled in accordance with the exposure time.

  Here, the door opening start by the door opening instruction input is waited (step S12), and the exposure value after a predetermined time has elapsed from the door opening start time is locked to perform exposure adjustment (step S13). At this time, the amount of exposure suddenly increases due to the amount of light from the hall brighter than the car room, but since exposure adjustment is performed with the exposure value locked, over-exposure of the car room image during the door opening operation can be reduced. it can.

  Subsequently, it is determined whether or not the door is fully opened (step S14). When the door is fully opened, the detection area B of the landing image is designated, the exposure amount of the detection area B is measured, and an appropriate value is determined based on the measurement result. The exposure is automatically adjusted (step S15).

  Here, it waits for the door closing start by the door closing instruction input (step S16), locks the exposure value after a predetermined time from the door closing start time, and performs exposure adjustment (step S17). At this time, the image area of the hall is reduced and the exposure amount suddenly decreases. However, since exposure adjustment is performed in a state where the exposure value is locked, blackout of the image during the door closing operation can be reduced.

  Subsequently, it is determined whether or not the door is fully closed (step S18). If the door is fully closed, the process returns to step S11, and a series of processes are repeatedly executed.

  Here, it takes a predetermined time to obtain the optimum exposure value. Therefore, in the above embodiment, the exposure value is locked after a predetermined time has elapsed from the door opening start time and the door closing start time. Specifically, since it takes a little time to perform the process of obtaining the optimal exposure value by the automatic adjustment function from the exposure value used immediately before, the lock is performed after a predetermined time in consideration of the switching time. I am doing so.

  As described above, in this embodiment, during the door opening operation and the door closing operation, the exposure value after a predetermined time has elapsed from each start time is acquired and locked, and the locked exposure value is fixed. Adjust the exposure as follows. Thereby, the influence by the brightness of an imaging range can be reduced.

  According to the above-described embodiment, an elevator system that can appropriately improve the image quality of a captured image near the car entrance and exit, and that can further improve safety measures when opening and closing the door is provided. be able to.

  In the above embodiment, the case where the exposure adjustment method is controlled by the exposure time by the electronic shutter has been described. However, a method for controlling the sensitivity of the image sensor, a method for controlling the frame interval, or a combination thereof is adopted. However, it can be implemented.

  In the above embodiment, the case where the exposure adjustment detection area is switched based on the door opening instruction of the car door has been described. However, the respective states are detected during the fully closed state, during the door open operation, during the fully open state, and during the door close operation. Then, based on the detection result, the exposure adjustment detection area may be switched.

  Further, when the appropriate exposure value can be set from the outside of the camera, the position of the door may be detected, and the appropriate exposure value may be fixed or changed based on the detection result. For example, the appropriate exposure value is fixed when the door is open and closed, and the brightness value of the entire screen (or part of the screen / entire detection area / part of the detection area) when fully open or fully closed. Are varied so that the average value falls within a predetermined area.

  Moreover, you may make it change exposure adjustment with a time slot | zone. For example, when the detection area is affected by sunlight or the like, the exposure value is switched to a preset exposure value depending on at least one of time (daytime / nighttime, etc.) and season. Alternatively, a learning function is provided for exposure adjustment, and an exposure value is set by obtaining an optimum value for each hour (+ season).

  Further, it is desirable to adjust the exposure so that the luminance value in the detection area is within a predetermined range. For example, the exposure adjustment is performed so that the luminance value (0 to 255) in the detection area falls within a certain range (for example, near the center of 110 to 140).

  The exposure value is desirably set according to the floor color of the hall on each floor. That is, since the color of the floor of the hall is related to the exposure adjustment, the exposure value at each floor is individually determined, and the exposure value is changed according to the floor color.

  Further, it is desirable to change the exposure value depending on the combination of the floor and the time zone. That is, since the exposure adjustment is affected by the floor color + sunlight, the exposure value is determined by the time zone and the floor color.

  In addition, using a sensor (such as an infrared sensor or illuminometer) installed near the camera, information on the brightness on the landing side is obtained when the door is opened, and an optimal exposure value is calculated based on that brightness. The exposure may be set using the value.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 11 ... Car control apparatus, 111 ... Door opening / closing control part, 12 ... Ride car, 13, 13a, 13b ... Car door, 14, 14a, 14b ... Landing door, 15 ... Camera, 151 ... Imaging part, 152 ... Image memory, 153... Exposure amount measurement unit, 154... Exposure control unit, 16... Image processing device, 21... CPU, 22.

Claims (9)

Installed at the upper part of the car entrance and entrance, equipped with a camera that takes an image of the car interior and the landing area by photographing the vicinity of the door in the car interior, and analyzes the image captured by the camera to obtain a state near the door Elevator system to manage
Exposure adjustment means for measuring an exposure value for a designated detection area within the imaging range and performing exposure adjustment so that the measured exposure value becomes an appropriate exposure value;
When the position of the door is in the fully closed state and the door opening operation, the detection area is designated as the interior side of the car within the imaging range, and when the door is in the fully open state and the door closing operation, the detection area is the landing of the imaging range Control means for performing the exposure adjustment specified on the side,
The control means performs automatic exposure adjustment when the door is fully closed, performs exposure adjustment with a fixed exposure value based on the exposure value when the door is fully closed, and performs automatic exposure adjustment when the door is fully open. An elevator system that controls to perform exposure adjustment with a fixed exposure value based on the exposure value in the fully opened state during the door closing operation.   The control means performs exposure adjustment using the average exposure value of the exposure value acquired in the fully closed state during the door opening operation as the fixed exposure value, and the exposure value acquired in the fully open state during the door closing operation. The elevator system according to claim 1, wherein exposure control is performed using the average exposure value. Installed at the upper part of the car entrance and entrance, equipped with a camera that captures the image of the car interior and the landing area by photographing the vicinity of the door in the car interior, and analyzes the image captured by the camera to obtain a state near the door Elevator system to manage
Exposure adjustment means for measuring an exposure value for a designated detection area within the imaging range and performing exposure adjustment so that the measured exposure value becomes an appropriate exposure value;
When the position of the door is in the fully closed state and the door opening operation, the detection area is designated as the interior side of the car within the imaging range, and when the door is in the fully open state and the door closing operation, the detection area is the landing of the imaging range Control means for performing the exposure adjustment specified on the side;
Comprising
The control means performs automatic exposure adjustment when the door is fully closed , and when the door is fully opened from the door fully closed state, the exposure value calculated after a predetermined time has elapsed from the start of the door opening is a fixed exposure value locked. When exposure adjustment is performed, automatic exposure adjustment is performed in the fully open state , and when the door is fully closed from the fully open state, the exposure adjustment is performed with a fixed exposure value that locks the exposure value that is calculated after a lapse of a predetermined time since the door closed To control the elevator system.   The elevator system according to claim 1, wherein the control means changes the appropriate exposure value according to at least one of time and season.   The elevator system according to claim 4, wherein the control means has an exposure adjustment learning function, and performs exposure setting by obtaining an appropriate exposure value of at least one of the time and season.   The elevator system according to claim 1, wherein the control means adjusts exposure so that a luminance value in the detection area is within a predetermined range.   The elevator system according to claim 1, wherein the control means sets the appropriate exposure value in accordance with a floor color of a hall on each floor.   The elevator system according to claim 7, wherein the control means changes the appropriate exposure value according to a combination of a floor color and a time zone of the hall on each floor. In addition, a sensor is provided in the vicinity of the camera for obtaining information on the brightness on the landing side when the door is opened,
The elevator system according to claim 1, wherein the control means calculates an appropriate exposure value based on brightness information obtained by the sensor, and sets exposure using the value.

Images