JP2014196187A - Camera device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera device for an elevator enabling automatic setting of image signal correction processing effective for removing noise included in an image signal from a car interior camera.SOLUTION: A camera device for an elevator includes: first correction means for applying correcting processing to an image signal from a car interior camera and then outputting the image signal; second correction means for applying correcting processing to an image signal from the first correction means via an image cable and then outputting the image signal; a monitor for displaying the image signal from the second correction means; and first and second control means for controlling the correcting processing by the first and second correction means, respectively. The second control means determines the correcting processing to be performed by each of the first and second correction means on the basis of the image signal from the first correction means, and based on the determination result, the second control means transmits a command signal to the first control means and performs correction processing control of the second correction means. The first control means controls the correcting processing by the first correction means on the basis of the command signal.

Description

  The present invention relates to a camera device for an elevator.

  A conventional elevator camera device is a surveillance camera system in which a surveillance camera and a video receiving device that receives video signals from the surveillance camera are connected by a coaxial cable, and is connected to the coaxial cable and guided to the coaxial cable. A lightning arrester including a protection circuit for protecting the surveillance camera and the video receiving device from a surge voltage is provided. In addition, there is provided switching means for switching the connection of the metal housing provided in the lightning arrester to a state connected to the ground terminal, a state connected to the external conductor connection terminal, and a state where both the ground terminal and the external conductor connection terminal are disconnected. Yes. Then, by operating the operation knob of this switching means by hand, the connection state of the lightning arrester metal housing is switched according to the noise state and the lightning protection state to the high frequency video signal received by the video receiving device. What has been made possible is known (see, for example, Patent Document 1).

JP 2011-061331 A JP 2010-275095 A

  However, in the conventional elevator camera device disclosed in Patent Document 1, a person determines an appropriate connection destination according to the noise state and the lightning protection state, and the connection destination is manually switched by a human hand. Need to be implemented.

  Also, in general, an elevator camera device is susceptible to video signal noise due to various factors such as inverter noise accompanying motor drive, elevator drive, building ground environment, and video cable wiring method. is there. However, the conventional elevator camera device disclosed in Patent Document 1 does not consider the environment in which such an elevator camera device is placed, and effectively eliminates video signal noise caused by various factors. Difficult to remove.

  The present invention has been made to solve such a problem, and it is possible to automatically perform setting of video signal correction processing effective for removing noise included in the video signal from the car camera. There is provided an elevator camera device capable of improving the quality of a video signal from an in-car camera without requiring a setting operation by a human hand.

  In the elevator camera apparatus according to the present invention, a camera provided in a car cage room disposed in a hoistway of the elevator and outputting a video signal, and a video provided in the car and output from the camera First correction means that outputs the signal after correction processing, and the first correction means are connected to be communicable with the first correction means via a video cable, and correction processing is performed on the video signal from the first correction means. A second correction unit that outputs the corrected image, a monitor that is provided outside the hoistway and displays an image based on the video signal output from the second correction unit, and a first correction unit A first control unit that controls the correction process; and a second control unit that controls the correction process in the second correction unit. The second control unit includes: For video signal Accordingly, the correction process performed by the first correction unit and the correction process performed by the second correction unit are determined, and a command signal is transmitted to the first control unit based on the determination, and based on the determination Configuration for controlling correction processing in the second correction means, wherein the first control means controls correction processing in the first correction means based on a command signal transmitted from the second control means. And

  In the elevator camera apparatus according to the present invention, it is possible to automatically perform setting of video signal correction processing effective for removing noise included in the video signal from the car camera, and setting by human hands There is an effect that the quality of the video signal from the in-car camera can be improved without requiring an operation.

It is a figure which illustrates typically the whole structure of the camera apparatus of the elevator which concerns on Embodiment 1 of this invention. It is a figure explaining the circuit structure of the camera apparatus of the elevator which concerns on Embodiment 1 of this invention. It is a flowchart explaining operation | movement of the camera apparatus of the elevator which concerns on Embodiment 1 of this invention.

  The present invention will be described with reference to the accompanying drawings. Throughout the drawings, the same reference numerals indicate the same or corresponding parts, and redundant description thereof will be simplified or omitted as appropriate.

Embodiment 1 FIG.
1 to 3 relate to Embodiment 1 of the present invention. FIG. 1 schematically illustrates the overall configuration of an elevator camera device, and FIG. 2 illustrates the circuit configuration of the elevator camera device. 3 and 3 are flowcharts for explaining the operation of the camera device of the elevator.

  In FIG. 1, a car 10 is disposed in a hoistway (not shown) of the elevator so as to be lifted and lowered. An in-car camera 11 is installed in the car room of the car 10 to photograph the situation inside the car room. This in-car camera 11 outputs the imaged situation in the car room as a video signal. A machine room 20 is provided further above the top of the hoistway. A control panel 21 for controlling the operation of the elevator is installed in the machine room 20.

  A monitoring room 30 is provided in the building where the elevator is installed. In the monitoring room 30, a monitor 31 for displaying an image taken by the in-car camera 11 is installed. The monitoring room 30 may be located not only in the building where the elevator is installed, but also in a monitoring center that centrally monitors the state of the elevators of a plurality of buildings outside the building. Regardless of whether the monitoring room 30 is inside or outside the building, the monitor 31 is provided outside the elevator hoistway.

  The first image correction means 40 is installed on the car 10, for example, behind the ceiling. The first video correction means 40 performs a correction process on the video signal output from the in-car camera 11 and outputs it. In the vicinity of the first video correction means 40, a first control means 50 is installed. The first control unit 50 controls the correction process performed on the video signal in the first video correction unit 40.

  The control panel 21 of the machine room 20 is provided with second image correction means 60. The second video correction unit 60 is connected to the first video correction unit 40 via the video cable 80 so as to be communicable. The video cable 80 is disposed in the hoistway. The second video correction unit 60 further performs correction processing on the video signal from the first video correction unit 40 and outputs the video signal. The video signal output from the second video correction unit 60 is input to the monitor 31. The monitor 31 displays a video based on the input video signal.

  In the vicinity of the second video correction means 60, the second control means 70 is installed. The second control unit 70 controls the correction process performed on the video signal in the second video correction unit 60.

  The details of the first video correction means 40, the first control means 50, the second video correction means 60, the second control means 70 and the video cable 80 of the elevator camera apparatus constructed as described above are particularly detailed. The configuration is shown in FIG. First, the video cable 80 includes two lines, a video signal line 81 and a GND line 82. For the video cable 80, for example, a coaxial cable is used.

  The first video correction means 40 includes a first video transformer circuit 41, a video signal amplifier circuit 42, and a first GND ground circuit 43. The video signal line and the GND line from the car camera 11 are connected to the primary side of the first video transformer circuit 41. A video signal amplification circuit 42 is connected to the secondary video signal line of the first video transformer circuit 41. A first GND ground circuit 43 is connected to the secondary GND line of the first video transformer circuit 41.

  The first video transformer circuit changeover switch 41a is inserted in the connection portion of the first video transformer circuit 41 to the video signal line and the GND line. By switching the first video transformer circuit changeover switch 41a, it is possible to switch whether or not the video signal line and GND line signals are passed through the first video transformer circuit 41. That is, the first video transformer circuit 41 can be switched between valid / invalid by switching the first video transformer circuit changeover switch 41a.

  A video signal amplifier circuit changeover switch 42a is inserted in a connection portion of the video signal amplifier circuit 42 to the video signal line. By switching this video signal amplifier circuit switch 42a, it is possible to switch whether or not the signal of the video signal line is passed through the video signal amplifier circuit. That is, the video signal amplifier circuit 42 can be switched between valid / invalid by switching the video signal amplifier circuit switch 42a.

  A first GND ground circuit changeover switch 43a is inserted in a connection portion of the first GND ground circuit 43 to the GND line. By switching the first GND ground circuit change-over switch 43a, it is possible to switch whether or not the GND line is grounded via the first GND ground circuit 43. That is, it is possible to switch the validity / invalidity of the first GND ground circuit 43 by switching the first GND ground circuit selector switch 43a.

  The video signal line of the first video correction means 40 is connected to the video signal line 81 of the video cable 80, and the GND line of the first video correction means 40 is connected to the GND line 82 of the video cable 80. The video signal line 81 of the video cable 80 is connected to the video signal line of the second video correction means 60, and the GND line 82 of the video cable 80 is connected to the GND line of the second video correction means 60. Yes.

  The second video correction means 60 includes a second video transformer circuit 61, a video signal restoration circuit 62, and a second GND ground circuit 63. A video signal restoration circuit 62 is connected to the video signal line from the video cable 80. A second GND ground circuit 63 is connected to the GND line from the video cable 80. The video signal line to which the video signal restoration circuit 62 is connected and the GND line to which the second GND ground circuit 63 is connected are connected to the primary side of the second video transformer circuit 61. The secondary video signal line and the GND line of the second video transformer circuit 61 are connected to the monitor 31.

  A second video transformer circuit changeover switch 61a is inserted in the connection portion of the second video transformer circuit 61 to the video signal line and the GND line. By switching the second video transformer circuit changeover switch 61a, it is possible to switch whether or not the video signal line and GND line signals are passed through the second video transformer circuit 61. That is, by switching the second video transformer circuit changeover switch 61a, the validity / invalidity of the second video transformer circuit 61 can be switched.

  A video signal restoration circuit change-over switch 62a is inserted in a connection portion of the video signal restoration circuit 62 to the video signal line. By switching the video signal restoration circuit selector switch 62a, it is possible to switch whether or not the signal of the video signal line is passed through the video signal restoration circuit. That is, the video signal restoration circuit 62 can be switched between valid / invalid by switching the video signal restoration circuit selector switch 62a.

  A second GND ground circuit changeover switch 63a is inserted in the connection portion of the second GND ground circuit 63 to the GND line. By switching the second GND ground circuit change-over switch 63a, it is possible to switch whether or not the GND line is grounded via the second GND ground circuit 63. That is, it is possible to switch the validity / invalidity of the second GND ground circuit 63 by switching the second GND ground circuit selector switch 63a.

  Each of the first video transformer circuit 41 and the second video transformer circuit 61 electrically insulates the video signal between the primary side and the secondary side, and generates low-frequency GND potential fluctuation noise included in the video signal. On the other hand, this is an effective video correction circuit (noise removal circuit). However, since the first video transformer circuit 41 and the second video transformer circuit 61 transmit a signal from the primary side to the secondary side using the mutual induction phenomenon, a loss occurs in the transmission process and the video signal The level tends to deteriorate.

  The video signal amplification circuit 42 and the video signal restoration circuit 62 amplify and output the video signal on the transmission side (first video correction means 40 side) and the video signal on the reception side (second video correction means 60 side). This is a circuit having a function of restoring the original. By using the video signal amplifier circuit 42 and the video signal restoration circuit 62 as a set, the S / N ratio of the video signal can be improved. Therefore, the video signal amplification circuit 42 and the video signal restoration circuit 62 are video correction circuits (noise removal circuits) that are effective against high frequency induction noise. However, the video signal amplification circuit 42 and the video signal restoration circuit 62 have an electronic circuit built therein, and the video signal quality tends to deteriorate because the video signal cannot be completely restored.

  The first GND ground circuit 43 and the second GND ground circuit 63 are video correction circuits (noise removal circuits) that switch between ground / non-ground of the GND line of the video signal as described above. Therefore, if the reference potential (ground potential) of these ground circuits is stable, the stability of the GND line can be improved. However, if the reference potential (ground potential) of these ground circuits is unstable, the stability of the GND line is impaired and the video signal is disturbed.

  As described above, the video correction circuits included in the first video correction unit 40 and the second video correction unit 60 have different characteristics. Therefore, as described above, there is provided a selector switch for switching between valid / invalid of each video correction circuit. Then, by operating these changeover switches, a more effective video correction circuit can be appropriately operated according to the type of noise included in the video signal and the attenuation level of the video signal. Yes.

  Controlling the state of these changeover switches controls the video signal correction processing in the first video correction means 40 and the video signal correction processing in the second video correction means 60, respectively. Means 50 and second control means 70.

  That is, the first control unit 50 is connected to the first video correction unit 40 by the first switch control signal line 51. Then, the first control means 50 is connected to the first video transformer circuit changeover switch 41a, the video signal amplification circuit changeover switch 42a and the first GND of the first video correction means 40 via the first switch control signal line 51. A switch control signal is transmitted to each of the ground circuit selector switches 43a.

  The first video transformer circuit selector switch 41a, the video signal amplifier circuit selector switch 42a, and the first GND ground circuit selector switch 43a of the first video correction means 40 are connected in accordance with the received switch control signal. The state is switched. In this way, the first control unit 50 controls the correction process in the first video correction unit 40 by switching the validity / invalidity of one or more video correction circuits included in the first video correction unit 40. .

  The second control means 70 is connected to the second video correction means 60 by the second switch control signal line 71. Then, the second control means 70 is connected to the second video transformer circuit changeover switch 61a, the video signal restoration circuit changeover switch 62a and the second GND of the second video correction means 60 via the second switch control signal line 71. A switch control signal is transmitted to each of the ground circuit selector switches 63a.

  Then, the second video transformer circuit changeover switch 61a, the video signal restoration circuit changeover switch 62a, and the second GND ground circuit changeover switch 63a of the second video correction means 60 are connected according to the received switch control signal. The state is switched. In this way, the second control unit 70 controls the correction process in the second video correction unit 60 by switching the validity / invalidity of one or more video correction circuits included in the second video correction unit 60. .

  The first control unit 50 transmits the arbitrary video signal generated by the first control unit 50 to the first video correction unit 40 via the arbitrary video signal output line 52. When the first video correction unit 40 receives the video signal from the first control unit 50, the first video correction unit 40 blocks the video signal from the in-car camera 11, and instead the video signal from the first control unit 50. Is output to the video cable 80. In this way, the first control unit 50 can output an arbitrary video signal from the first video correction unit 40 instead of the video signal output from the in-car camera 11.

  Here, when the camera device of the elevator is in the normal mode, the first video correction means 40 performs correction processing on the video signal from the car camera 11 according to the state of each changeover switch, The video is output to the video cable 80.

  The camera device of the elevator enters the adjustment mode when a predetermined condition such as when the camera device is turned on is satisfied. When the camera device of the elevator enters the adjustment mode, the first control means 50 outputs a test video signal predetermined as an arbitrary video signal for a predetermined time via the optional video signal output line 52. It transmits to the image correction means 40. Then, the first video correction means 40 replaces the video signal from the car camera 11 with the test video signal from the first control means 50 via the video cable 80 and the second video correction means 60. Send to.

  When the video signal input from the video cable 80 is a test video signal, the second video correction means 60 is input from the video cable 80 via the in-car video signal input line 73. The video signal is input to the second control means 70.

  When the test video signal is input from the in-car video signal input line 73, the second control means 70 shifts to the adjustment mode. The second control means 70 in the adjustment mode analyzes the video signal input from the in-car video signal input line 73, and based on the signal level of the video signal, the noise contained in the video signal is analyzed. Determine the type and attenuation level of the video signal. Based on the determination result, noise included in the video signal is more appropriately removed from the video correction circuits included in the first video correction unit 40 and the second video correction unit 60, and the video signal is obtained. A video correction circuit capable of improving the quality of the image is selected.

  At this time, the number of video correction circuits to be selected is not limited to one for each of the first video correction means 40 and the second video correction means 60, and a plurality of video correction circuits are enabled in one video correction means. These circuits may be used in combination. The selection of one or more video correction circuits that are effective in each video correction unit as described above, that is, the correction processing performed by the first video correction unit 40 and the correction processing performed by the second video correction unit 60, respectively. It is to decide.

  In this way, the second control means 70 is based on the video signal received by the second video correction means when the test video signal is output from the first video correction means 40, that is, in the adjustment mode. Each of the correction process performed by the first video correction unit 40 and the correction process performed by the second video correction unit 60 is determined.

  Then, the second control means 70 uses the second video control means 60 via the second switch control signal line 71 so that the video correction circuit necessary for executing the determined correction processing becomes effective. A switch control signal is transmitted to. Thus, the second control unit 70 controls the correction process in the second video correction unit 60 based on the determination in the adjustment mode.

  In addition, the second control unit 70 outputs a control command from the command output line 72 based on the determination regarding the correction process of the first video correction unit 40 in the adjustment mode. A control command from the command output line 72 is sent from the second video correction means 60 to the first video correction means 40 via the video cable 80. Since the video cable 80 is used for transmission of the control command, it is preferable to transmit the control command by interrupting the transmission of the test video signal from the first control means 50.

  Then, the control command is input from the first video correction unit 40 to the first control unit 50 via the command input line 53. In the first control means 50, the video correction circuit necessary for performing the correction process determined for the first video correction means 40 in the adjustment mode based on the control command input from the command input line 53 is valid. Thus, the switch control signal is transmitted to the first video correction means 40 via the first switch control signal line 51. Thus, the first control unit 50 controls the correction process in the first video correction unit 40 based on the control command transmitted from the second control unit 70 in the adjustment mode.

  As described above, in the adjustment mode, the video signal received from the first video correction unit 40 via the video cable 80 to the second video correction unit 60 is analyzed and included in this video signal. Determine an effective correction process to remove noise. Then, the determined correction process is actually reflected on the first video correction unit 40 and the second video correction unit 60.

  After reflecting the correction processing determined in this way, the second control means 70 detects the noise level of the video signal. If the detected noise level exceeds a predetermined value, the second control unit 70 analyzes the video signal again and re-decides a correction process effective for noise removal. As the correction process to be redetermined, a correction process (combination) different from the current one is selected in principle.

  Then, the re-determined correction process is reflected in the first video correction unit 40 and the second video correction unit 60, and it is confirmed whether the noise level of the video signal is equal to or less than a specified value. In this way, the cycle of confirming the noise level of the video signal, analyzing the video signal, and determining / reflecting the correction process is repeated, and finally the first video correction is performed when the noise level of the video signal falls below the specified value. The correction processing to be performed by the means 40 and the second video correction means 60 is determined.

  When the configuration of the optimum correction processing is completed as described above, the first control unit 50 stops outputting the test video signal, and the second control unit 70 configures the first control unit 50. Outputs a completion command. Then, the camera device of the elevator shifts to the normal mode, and the correction processing finally determined for the video signal photographed by the car camera 11 is the first video correction means 40 and the second video correction means. The image provided by 60 is displayed on the monitor 31.

  Note that the test video signal used in the adjustment mode is desirably, for example, a signal with a white background on the entire surface. This is because the color signal in the NTSC signal is fixed at a potential of 100% white level, so that the color burst signal that is the synchronization signal of the video signal can be easily identified. Furthermore, since the signal of the entire white background is not normally output from the in-car camera 11, there is also a reason that it is easy to determine that it is a test video signal.

The operation flow of the elevator camera apparatus configured as described above in this embodiment will be described again with reference to the flowchart of FIG.
First, when the power of the elevator camera device (elevator security camera video system) is turned on (step S1), the elevator camera device shifts to an adjustment mode, and an arbitrary video signal, for example, from the first control means 50, for example. A preset test video signal (specifically, a video signal with a full white background) is output (step S2).

  In the subsequent step S3, the second control means 70 confirms whether or not the received video signal is more than a specified level by checking whether or not the received video signal is higher than the specified level. Determine whether. Then, when the signal attenuation more than the standard occurs in the video signal, the process proceeds to step S4.

  In step S4, the second control means 70 operates the video signal restoration circuit selector switch 62a to validate the video signal restoration circuit 62. On the other hand, in step S3, if the signal signal is not attenuated more than specified in the video signal, the process proceeds to step S5 without skipping step S4 and enabling the video signal restoration circuit 62. The specific function / configuration of the video signal restoration circuit 62 is the same as that of a general AGC (Automatic Gain Control) circuit.

  In step S5, the second control means 70 detects the noise level included in the received test video signal and confirms whether the noise level is equal to or less than a specified value. In the detection of the noise level, the second control means 70 analyzes the frequency characteristics of the video signal, and determines that there is noise when it is detected that the level of the non-specified frequency is equal to or higher than the specified value. If the noise level of the received video signal is below the specified value, the process proceeds to step S21.

  In step S <b> 21, the elevator camera device ends the adjustment mode and shifts to the normal mode, and an image in the car 10 captured by the car camera 11 is displayed on the monitor 31. And a series of operation | movement flows are complete | finished.

  On the other hand, when the noise level of the received video signal exceeds the specified value in step S5, the process proceeds to step S6. In step S6, the second control means 70 determines whether or not the noise included in the received video signal is low frequency noise. If the noise included in the received video signal is low frequency noise, the process proceeds to step S7. Note that when video signal noise is generated, in most cases, it is low-frequency noise, and the low-frequency noise may circulate through the ground.

  In step S7, the first control means 50 operates the first video transformer circuit changeover switch 41a to enable the first video transformer circuit 41. Further, the second control means 70 operates the second video transformer circuit changeover switch 61a to validate the second video transformer circuit 61. Note that the video transformer circuit is an effective countermeasure circuit for fluctuations in the GND potential of the video signal, that is, low frequency noise.

  The subsequent step S8 is a step of determining whether or not the video signal noise has been successfully removed. That is, in this step S8, the second control means 70 detects the noise level included in the received test video signal, and confirms whether or not the noise level is equal to or less than a specified value. If the noise level of the received video signal is below the specified value, the process proceeds to step S21. On the other hand, if the noise level of the received video signal still exceeds the specified value, the process proceeds to step S9.

  Step S9 is a step of determining whether or not the video signal noise is successfully reduced even if the video signal noise cannot be completely removed. That is, in this step S9, the second control means 70 detects the noise level included in the received test video signal, and determines whether or not the noise level has been reduced compared to before step S7. To do.

  If no reduction is observed in the noise level, the process proceeds to step S10, the first video transformer circuit 41 and the second video transformer circuit 61 activated in step S7 are invalidated, and then the process proceeds to step S11. move on. The video signal loss can be prevented by invalidating the circuit that does not show the noise reduction effect.

  On the other hand, if the noise level is reduced, it can be determined that the circuit activated in step S7 has a certain effect on noise reduction. For this reason, step S10 is skipped and the process proceeds to step S11 while the first video transformer circuit 41 and the second video transformer circuit 61 remain valid.

  In step S11, the second control unit 70 determines whether or not the noise included in the received video signal is high-frequency noise. If the noise included in the received video signal is high-frequency noise, the process proceeds to step S12. In general, the high frequency noise is elevator inverter noise.

  In step S12, the first control means 50 operates the video signal amplifier circuit switch 42a to enable the video signal amplifier circuit 42. Further, the second control means 70 operates the video signal restoration circuit changeover switch 62a to validate the video signal restoration circuit 62. Since the video signal noise applied to the video cable 80 is not amplified even if the video signal is amplified, the S / N ratio of the video signal can be improved. Since the amplified video signal is restored to the original level and input to the monitor 31, there is no possibility that an excessive level signal is input to the monitor 31.

  The subsequent step S13 is a step of determining whether or not the video signal noise has been successfully removed. That is, in this step S13, the second control means 70 detects the noise level contained in the received test video signal and confirms whether or not the noise level is not more than a specified value. If the noise level of the received video signal is below the specified value, the process proceeds to step S21. On the other hand, if the noise level of the received video signal still exceeds the specified value, the process proceeds to step S14.

  Step S14 is a step of determining whether or not the video signal noise has been successfully reduced even if the video signal noise cannot be completely removed. That is, in this step S14, the second control means 70 detects the noise level contained in the received test video signal, and determines whether or not the noise level has been reduced compared to before step S12. To do.

  If no reduction is found in the noise level, the process proceeds to step S15, the video signal amplification circuit 42 and the video signal restoration circuit 62 enabled in step S12 are invalidated, and then the process proceeds to step S16. The video signal loss can be prevented by invalidating the circuit that does not show the noise reduction effect.

  On the other hand, if the noise level is reduced, it can be determined that the circuit activated in step S12 has a certain effect on noise reduction. For this reason, step S15 is skipped and the process proceeds to step S16 while the video signal amplification circuit 42 and the video signal restoration circuit 62 remain valid.

  In step S16, the first control means 50 operates the first GND ground circuit changeover switch 43a to validate the first GND ground circuit 43. Further, the second control means 70 operates the second GND ground circuit changeover switch 63a to validate the second GND ground circuit 63. When the ground potential is stable, grounding the GND line of the video signal stabilizes the GND potential and reduces the influence of noise.

  The subsequent step S17 is a step of determining whether or not the video signal noise has been successfully removed. That is, in this step S17, the second control means 70 detects the noise level included in the received test video signal and confirms whether or not the noise level is equal to or less than a specified value. If the noise level of the received video signal is below the specified value, the process proceeds to step S21. On the other hand, if the noise level of the received video signal still exceeds the specified value, the process proceeds to step S18.

  Step S18 is a step of determining whether or not the video signal noise is successfully reduced even if the video signal noise cannot be completely removed. That is, in this step S18, the second control means 70 detects the noise level included in the received test video signal, and determines whether or not the noise level has been reduced compared to before step S16. To do.

  If no reduction is observed in the noise level, the process proceeds to step S19, the first GND ground circuit 43 and the second GND ground circuit 63 enabled in step S16 are invalidated, and then the process proceeds to step S20. move on. By disabling the GND ground circuit, unnecessary adverse effects from the ground potential can be prevented.

  On the other hand, if the noise level is reduced, it can be determined that the circuit activated in step S16 has a certain effect on noise reduction. For this reason, step S19 is skipped and the process proceeds to step S20 while the first GND ground circuit 43 and the second GND ground circuit 63 remain valid.

  In step S <b> 20, for example, the second control unit 70 displays on the monitor 31 the video signal noise countermeasure NG. In many cases, the noise level can be reduced to a specified value or less by taking measures against video signal noise from step S6 to step S19. However, in the unlikely event that the noise level cannot be reduced below the specified value even with the video signal noise countermeasures from step S6 to step S19, the administrator or the like needs to take another countermeasure. Can be specified. In this case, if necessary, a countermeasure such as fine adjustment by a human hand is separately sought.

  After step S20, the process proceeds to step S21, the elevator camera device ends the adjustment mode and shifts to the normal mode, and then the series of operation flow ends.

  In the above, the series of processing from step S6 to step S10 controls the validity / invalidity of the first video transformer circuit 41 and the second video transformer circuit 61. A series of processes from step S11 to step S15 controls the validity / invalidity of the video signal amplifier circuit 42 and the video signal restoration circuit 62. A series of processes from step S16 to step S19 controls the validity / invalidity of the first GND ground circuit 43 and the second GND ground circuit 63.

  The changeover switches of the correction circuits included in the first video correction unit 40 and the second video correction unit 60 are automatically switched by the first control unit 50 and the second control unit 70, The switching operation may be manually performed by a human hand. The valid / invalid state of each correction circuit may be displayed on the monitor 31, or may be displayed by an LED lamp or the like provided in the first control means 50 and the second control means 70.

  The camera device for an elevator configured as described above is provided in a car (in-car camera 11) provided in a car room of a car provided in a hoistway of the elevator, and provided in the car. A first correction unit (first video correction unit 40) that outputs the video signal output from the first correction unit after being subjected to correction processing, and is communicably connected to the first correction unit via a video cable; Second correction means (second video correction means 60) for performing correction processing on the video signal from the first correction means and outputting it, and provided outside the hoistway and output from the second correction means A monitor 31 that displays an image based on the video signal, a first control unit 50 that controls correction processing in the first correction unit, and a second control unit 70 that controls correction processing in the second correction unit It is equipped with.

  Then, the second control unit 70 determines a correction process performed by the first correction unit and a correction process performed by the second correction unit based on the video signal from the first correction unit, and based on the determination. A command signal is transmitted to the first control means, and the correction processing in the second correction means is controlled based on the determination, and the first control means sends the command signal transmitted from the second control means to the command signal. Based on this, the correction process in the first correction means is controlled.

  In general, an elevator camera device is susceptible to image signal noise due to various factors such as inverter noise accompanying motor drive, elevator drive, building ground environment, and video cable wiring method. Also, due to the diversity of such noise factors, it is difficult to effectively remove video signal noise with uniform noise countermeasures.

  With respect to such a problem, according to the elevator camera apparatus of the present invention, the video signal noise type is identified by detecting the noise frequency by providing the above-described configuration, and the identified video signal noise is identified. It is possible to automatically remove video signal noise by connecting a circuit useful for the countermeasure. In other words, it is possible to automatically select settings for video signal correction processing that is effective for removing noise contained in the video signal from the in-car camera, and without the need for manual setting operations. The quality of the video signal from the inner camera can be improved and a clear monitor image can be obtained.

  The first control means 50 can output a predetermined test video signal from the first correction means instead of the video signal output from the camera, and the second control means 70 The correction process performed by the first correction unit and the correction process performed by the second correction unit based on the video signal received by the second correction unit when the test video signal is output from the first correction unit decide.

  For this reason, it is possible to select and set correction processing using test video signals suitable for detecting the type of video signal noise and video signal attenuation level, and realize more appropriate and reliable video correction processing in a shorter time. can do.

  The first correction means (first video correction means 40) includes one or more correction circuits among a video transformer circuit, a video signal amplifier circuit, and a ground circuit for performing correction processing, and the first control. The means 50 controls the correction processing in the first correction means by switching the validity / invalidity of one or more correction circuits provided in the first correction means, and the second correction means (second video correction means). 60) includes one or more correction circuits among a video transformer circuit, a video signal restoration circuit, and a ground circuit for performing correction processing, and the second control means 70 includes one or more correction circuits included in the second correction means. The correction process in the second correction unit is controlled by switching connection / disconnection of each correction circuit.

  For this reason, it is possible to implement countermeasures against noise by combining multiple correction circuits as necessary even for video noise that is caused by complex intertwining of multiple factors, further improving video signal quality. can do.

  In addition, by transmitting a command signal from the second control means 70 to the first control means 50 via the video cable, there is no need to separately lay a signal line for the command signal. Note that, when the command signal is transmitted through the video cable, it is preferable to interrupt the transmission of the test video signal or the like as described above.

  10 car, 11 camera in car, 20 machine room, 21 control panel, 30 monitoring room, 31 monitor, 40 first video correction means, 41 first video transformer circuit, 41a first video transformer circuit changeover switch, 42 Video signal amplifier circuit, 42a Video signal amplifier circuit switch, 43 First GND ground circuit, 43a First GND ground circuit switch, 50 First control means, 51 First switch control signal line, 52 Arbitrary video Signal output line, 53 command input line, 60 second video correction means, 61 second video transformer circuit, 61a second video transformer circuit changeover switch, 62 video signal restoration circuit, 62a video signal restoration circuit changeover switch, 63 Second GND ground circuit, 63a Second GND connection Ground circuit selector switch, 70 second control means, 71 second switch control signal line, 72 command output line, 73 in-car video signal input line, 80 video cable, 81 video signal line, 82 GND line.

Claims (4)

A camera provided in a car room of a car disposed in a hoistway of an elevator and outputting a video signal;
A first correction unit provided in the cage and outputting the video signal output from the camera after performing a correction process;
A second correction unit that is communicably connected to the first correction unit via a video cable, performs a correction process on the video signal from the first correction unit, and outputs the video signal;
A monitor provided outside the hoistway and displaying a video based on a video signal output from the second correction means;
First control means for controlling correction processing in the first correction means;
Second control means for controlling correction processing in the second correction means,
The second control unit determines a correction process performed by the first correction unit and a correction process performed by the second correction unit based on the video signal from the first correction unit, and based on the determination, A command signal is transmitted to the first control means, and the correction process in the second correction means is controlled based on the determination,
The first control means is a camera device for an elevator that controls correction processing in the first correction means based on a command signal transmitted from the second control means. The first control means can output a predetermined test video signal from the first correction means instead of the video signal output from the camera,
The second control unit includes a correction process performed by the first correction unit based on the video signal received by the second correction unit when the test video signal is output from the first correction unit; The elevator camera apparatus according to claim 1, wherein a correction process performed by the second correction unit is determined. The first correction means includes one or more correction circuits among a video transformer circuit, a video signal amplifier circuit, and a ground circuit for performing correction processing,
The first control unit controls correction processing in the first correction unit by switching between valid / invalid of one or more correction circuits provided in the first correction unit,
The second correction means includes one or more correction circuits among a video transformer circuit, a video signal restoration circuit, and a ground circuit for performing correction processing,
The second control means controls correction processing in the second correction means by switching connection / disconnection of one or more correction circuits provided in the second correction means. The camera apparatus of the elevator of Claim 1 or Claim 2.   4. The command signal from the second control unit is transmitted to the first control unit via the video cable. 4. The command signal according to claim 1, wherein the command signal is transmitted to the first control unit via the video cable. Elevator camera device.

Images