JP2019211234A - Distance measurement device - Google Patents

Abstract

To provide a distance measurement device in which a measurement error is small even when the irradiation point of a laser is distant.SOLUTION: The distance measurement device includes a laser distance measurement device 100 for measuring a distance to an object by emitting laser light and receiving laser light reflected from the object, and a monitoring camera 200 for photographing surroundings including a laser light irradiation point of the object to be irradiated with laser light from the laser distance measurement device. The monitoring camera includes a diaphragm 202 to which an optical image collected by a lens 201 is input, an image sensor 204 which photoelectrically converts the input optical image and outputs it as imaging data, and a filter switching section 203 which is disposed between the diaphragm and the image sensor. In the filter switching section, one of a near-infrared cut filter 203a for cutting off the near-infrared radiation, an optical bandpass filter 203b for passing the near-infrared radiation of the laser light, and an optical filter 203c for adjusting an optical path length from the lens to the image sensor is disposed oppositely between the diaphragm and the image sensor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a distance measuring device including a laser distance measuring device and a monitoring camera.

  For example, Patent Document 1 discloses a distance measuring apparatus using an image that targets a distance measuring object with a television camera. A distance measuring device according to Patent Document 1 includes a laser distance meter for measuring a distance to an object, a TV camera for monitoring the periphery of the object including a laser irradiation point, and a TV camera with a laser distance meter in two axes. A two-axis swivel that swivels in a direction, a two-axis swivel drive that drives the swivel, an arithmetic circuit that calculates a displacement angle of a laser irradiation point from distance measurement data obtained from a laser rangefinder, and the like. For example, a video signal synthesizing circuit device that superimposes on a video signal obtained by a television camera so that an image of the displacement angle can be displayed by, for example, an X mark or a ◯ mark, and a monitor that displays an image of the object together with a laser irradiation point are provided.

JP-A-9-304055

In the above-described conventional distance measuring device, the TV camera is for monitoring the surroundings of the target object including the laser irradiation point, and after performing the initial adjustment, measures the distance to the target object, and laser The actual measurement of the irradiation point is obtained by calculation from the optical axis deviation of the laser distance meter and the TV camera without directly capturing the laser beam with the TV camera.
Therefore, when the laser irradiation point is far away, there is a problem that the error becomes large unless the adjustment accuracy at the initial setting is sufficient.

  The present invention has been made in view of the above points, and can confirm the irradiation point of the laser beam from the laser distance measuring device by image information captured by the monitoring camera without impairing the monitoring function as the monitoring camera. An object is to obtain a distance measuring device.

  A distance measuring device according to the present invention emits a laser beam, receives a laser beam reflected from an object, measures a distance to the object, and irradiates a laser beam from the laser distance measuring device. A monitoring camera that captures the surroundings of the target object including the laser light irradiation point, and the monitoring camera photoelectrically converts the input optical image and the aperture to which the optical image collected by the lens is input. An image sensor that outputs information, a near-infrared cut filter that is disposed between the aperture and the image sensor and cuts light in the near-infrared region, an optical bandpass filter that passes the wavelength in the near-infrared region of laser light, Any one of the optical filters that adjust the optical path length from the lens to the image sensor has a filter switching unit that is disposed to face the diaphragm and the image sensor.

  According to the present invention, there is an effect that the irradiation point of the laser beam from the laser distance measuring device can be confirmed by image information captured by the monitoring camera without impairing the monitoring function as the monitoring camera.

It is a block diagram which shows the distance measuring device which concerns on Embodiment 1 of this invention. It is a block diagram which shows the distance measuring device which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
A distance measuring apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS.
When the laser distance measuring device 100 receives the laser ranging operation start signal 1 from the ranging control unit 301 of the computer 300, the laser distance measuring device 100 emits laser light, receives the laser light reflected from the object, and receives the distance to the object. Measure. The laser distance measuring apparatus 100 includes a laser transmission unit 101 that emits laser light toward an object through a transmission lens 102, and a laser reception that receives the laser light reflected from the object through a reception lens 104. Output value information such as the emission time, emission angle, emission intensity and frequency of the laser beam from the unit 103 and the laser transmission unit 101, and the reception time, reception angle and reception intensity of the reflected laser beam from the laser reception unit 103, etc. A distance measurement processing unit 105 that receives the received value information, calculates a time difference from when the laser beam is transmitted and received, and calculates the distance to the object to be measured by dividing by the speed of the light. .
The distance information 2 calculated by the distance measurement processing unit 105 is output to the display 500 and displayed on the display screen of the display 500.

The monitoring camera 200 captures the surroundings including the laser light irradiation point of the object irradiated with the laser light from the laser distance measuring device 100, and monitors the surroundings based on the captured image information, and the laser distance measuring device. The laser beam irradiation point on the object irradiated with the laser beam from 100 can be confirmed.
The surveillance camera 200 is a TV camera in the first embodiment.
The monitoring camera 200 is fixed together with the laser distance measuring device 100 to a two-axis swivel base 402 that is swiveled in a two-axis direction by a two-axis swivel base drive device 401. Note that the control device in the two-axis swivel drive device 401 may be built in the computer 300.

Hereinafter, the configuration of the monitoring camera 200 will be described. The surveillance camera 200 includes components having the reference numerals in the 200s.
The optical image collected by the lens 201 is controlled in light amount by the diaphragm 202 and input to the image sensor 204 via the filter switching unit 203.
The diaphragm 202 is controlled by the diaphragm control signal 3 by changing the size of the aperture diameter.

  The filter switching unit 203 includes a near-infrared cut filter 203a, an optical bandpass filter 203b, and an optical filter 203c that is an optical filter for back focus adjustment. In the filter switching unit 203, in the initial state and the normal monitoring function state, the near infrared cut filter 203a is disposed opposite to the rear stage of the aperture 202 and the front stage of the image sensor 204, and the optical image that has passed through the aperture 202 is the near infrared cut filter 203a. Is input to the image sensor 204. Further, the filter switching unit 203 is an optical device in which the filter indicated by the filter switching signal 4 is arranged to face the diaphragm 202 and the image sensor 204 by the filter switching signal 4 from the distance measurement control unit 301 of the computer 300 and passes through the diaphragm 202. An image is input to the image sensor 204 via a filter disposed opposite to the stop 202.

  In the first embodiment, the filter switching unit 203 that automatically switches the filter by the filter switching signal 4 from the distance measurement control unit 301 is shown. However, the filter switching signal 4 from the distance measurement control unit 301 of the computer 300 is shown. May be output to the display 500 to display the content of the filter switching signal 4 on the display screen of the display 500, and the filter switching may be manually performed. It may be provided and the filter is inserted into and removed from the filter insertion portion.

The near-infrared cut filter 203a is a filter for performing natural color reproduction by cutting light in the near-infrared region that is not visible to the human eye but to which the image sensor 204 reacts.
The optical bandpass filter 203b passes the wavelength in the near-infrared region of the laser light, that is, passes the light around the near infrared, blocks the light outside the near infrared, and captures the laser light reflected from the object. This is a filter for leading to the element 204.
The optical filter 203c is made of transparent optical glass or the like, and is a filter for guiding the laser light reflected from the object to the image sensor 204 in an environment without sunlight such as at night. When switching from the opposed position to 202 to the standby position, the optical path length (back focus) from the lens 201 to the image sensor 204 changes, and the image of the reflected laser light that has passed through the lens 201 is prevented from being blurred. This is a filter that adjusts the optical path length from the lens 201 to the image sensor 204.

  The image sensor 204 has an electronic shutter, photoelectrically converts an optical image that has passed through a filter, and outputs it as imaging information. The image sensor 204 controls the electronic shutter by the electronic shutter control signal 5 to control the amount of accumulated light, and controls the electronic shutter by the slow shutter control signal 6 to control the accumulation time.

The video signal processing circuit 205 converts imaging information from the imaging element 204 into video information.
The aperture control circuit 206 receives the video information from the video signal processing circuit 205 and outputs the aperture control signal 3 for controlling the aperture 202 to the aperture 202 so that the video signal from the video signal processing circuit 205 is optimized. Since the optical blur occurs when the diameter of the aperture 202 becomes smaller, the aperture control circuit 206 controls the aperture 202 so that the diameter does not become smaller than a specific aperture value (for example, F11). The aperture value of the aperture 202 based on the aperture control signal 3 at this time is output to the computer 300 as aperture control value information 7. The aperture control value information 7 stored in the computer 300 is received by the aperture control circuit 206, and the aperture control signal 3 based on the aperture control value information 7 is output.

The electronic shutter control circuit 207 receives the video information that has passed through the aperture control circuit 206, and when the aperture 202 is controlled to a specific aperture value and strong light enters the received video signal, the video signal processing circuit 205 The electronic shutter control signal 5 is output to the image sensor 204 so that the video signal from the image sensor is optimal. The image sensor 204 is controlled by the electronic shutter control signal 5 in the electronic shutter, and the amount of reflected laser light accumulated in the image sensor 204 is limited. The opening degree of the electronic shutter in the image sensor 204 based on the electronic shutter control signal 5 at this time is output from the electronic shutter control circuit 207 to the computer 300 as opening degree control value information 8. The electronic shutter control circuit 207 receives the opening control value information 8 stored in the computer 300 and outputs an electronic shutter control signal 5 based on the opening control value information 8.
The electronic shutter control circuit 207 is configured to receive the video information that has passed through the aperture control circuit 206, but may be configured to receive the video information from the video signal processing circuit 205 without passing through the aperture control circuit 206.

An AGC (Automatic Gain Control) circuit 208 receives video information that has passed through the electronic shutter control circuit 207, and when the intensity of the input video signal is smaller than a predetermined value, that is, the diameter of the diaphragm 202 is maximized, When the output of the element 204 is small, the image is electrically amplified to operate so as to keep the signal level appropriate. The gain value of the AGC circuit 208 at this time is output to the computer 300 as gain value information 9. The AGC circuit 208 generally operates at night when there is no sunlight.
Note that the AGC circuit 208 is configured to receive video information that has passed through the aperture control circuit 206 and the electronic shutter control circuit 207, but from the video signal processing circuit 205 without passing through the aperture control circuit 206 and the electronic shutter control circuit 207. It may be configured to receive video information.

The slow shutter control circuit 209 receives the video information that has passed through the AGC circuit 208, and controls the open / close speed of the electronic shutter of the image sensor 204 in order to control the accumulation time of the reflected laser light in the image sensor 204. 6 is output. When the intensity of the input video signal is smaller than the specified value, the slow shutter control circuit 209 increases the signal accumulation time of the image sensor 204 by slowing the closing speed of the electronic shutter of the image sensor 204. Increase the signal level. As a result, the video information 11 output from the slow shutter control circuit 209 is properly maintained, output to the display 500, and displayed on the display screen of the display 500.
Further, the electronic shutter opening / closing speed in the image sensor 204 based on the slow shutter control signal 6 at this time is output to the computer 300 as the opening / closing speed control value information 10. The slow shutter control circuit 209 receives the opening / closing speed control value information 10 stored in the computer 300 and outputs a slow shutter control signal 6 based on the opening / closing speed control value information 10.

The slow shutter control circuit 209 is configured to receive video information that has passed through the aperture control circuit 206, the electronic shutter control circuit 207, and the AGC circuit 208, but the aperture control circuit 206, the electronic shutter control circuit 207, and the AGC A configuration may be adopted in which the video information from the video signal processing circuit 205 is received without going through the circuit 208.
Further, since the video information from the video signal processing circuit 205 is the same as the video information 11 output from the slow shutter control circuit 209 as a result, the video information from the video signal processing circuit 205 is output to the display 500, and the display It is good also as a structure displayed on 500 display screens.

When the computer 300 receives the start command signal 12 from the operation start instruction unit 600, the computer 300 starts an operation based on the start command signal 12. The operation start instruction unit 600 may be an input device having operation buttons. The start command signal 12 includes a monitoring instruction signal for instructing a monitoring operation and a ranging instruction signal for instructing a ranging operation.
When receiving the start command signal 12 indicating the monitoring instruction signal, the distance measurement control unit 301 of the computer 300 outputs a monitoring signal for causing the laser distance measuring device 100 and the monitoring camera 200 to perform a normal monitoring operation.
At this time, the filter of the filter switching unit 203 is set to the near infrared cut filter 203a by the filter switching signal 4 from the distance measurement control unit 301 of the computer 300, and the optical image that has passed through the aperture 202 passes through the near infrared cut filter 203a. Are input to the image sensor 204. As a result, an image obtained by photographing the surroundings including the laser light irradiation point of the object irradiated with the laser light from the laser distance measuring device 100 by the monitoring camera 200 is displayed on the display screen of the display 500 as a natural color reproduction image. Is displayed.

  The distance measurement control unit 301 of the computer 300 has a storage unit. The storage unit includes an aperture value based on the aperture control value information 7, an electronic shutter value indicating the opening degree of the electronic shutter based on the aperture control value information 8, a gain value of the AGC circuit 208 based on the gain value information 9, and the like. And a slow shutter value indicating the opening / closing speed of the electronic shutter based on the opening / closing speed control value information 10 are stored.

When receiving the start command signal 12 indicating the distance measurement instruction signal, the distance measurement control unit 301 of the computer 300 outputs a distance measurement operation start signal for causing the laser distance measurement device 100 and the monitoring camera 200 to perform a distance measurement operation. To do.
When the distance measurement processing unit 105 of the laser distance measurement device 100 receives the laser distance measurement operation start signal 1 which is a distance measurement operation start signal from the distance measurement control unit 301, the laser distance measurement device 100 starts the laser distance measurement operation. .

The monitoring camera 200 receives a distance measurement operation start signal for performing a distance measurement operation, images the surroundings including the laser light irradiation point of the object irradiated with the laser light from the laser distance measurement device 100, and takes the image information. The laser ranging operation is started.
At the start of the laser ranging operation, the aperture control circuit 206, the electronic shutter control circuit 207, the AGC circuit 208, and the slow shutter control circuit 209 are respectively controlled by the aperture control value information 7 and the opening control value information 8 from the distance measurement control unit 301. The gain value information 9 and the opening / closing speed control value information 10 are received, and the aperture control value, electronic shutter value, AGC gain, and slow shutter value based on the information 10 are set as initial values from the information 7.

  In the initial state of the monitoring camera 200, the filter of the filter switching unit 203 is set in the near-infrared cut filter 203a by the filter switching signal 4 from the distance measurement control unit 301 of the computer 300, and the optical image that has passed through the aperture 202 is near-infrared. The image is input to the image sensor 204 via the cut filter 203a. At this time, the AGC gain in the AGC circuit 208 is output to the distance measurement control unit 301 as the gain value information 9.

The distance measurement control unit 301 compares the AGC gain of the received gain value information 9 with a preset threshold, determines the presence / absence of sunlight, and selects either the optical bandpass filter 203b or the optical filter 203c. The filter switching signal 4 is output to the filter switching unit 203.
The filter of the filter switching unit 203 is switched to either the optical bandpass filter 203b or the optical filter 203c by the filter switching signal 4, and either the optical bandpass filter 203b or the optical filter 203c from which the optical image that has passed through the stop 202 is selected. Is input to the image sensor 204 via the above. As a result, an image obtained by capturing the reflected laser light at the laser light irradiation point of the object irradiated with the laser light from the laser distance measuring device 100 by the monitoring camera 200 according to the presence or absence of sunlight is displayed on the display screen of the display 500. Is done.

  When the distance measuring operation ends, the aperture control value, electronic shutter value, AGC gain, and slow shutter value at the end of the distance measuring operation in the aperture control circuit 206, electronic shutter control circuit 207, AGC circuit 208, and slow shutter control circuit 209 are reduced. The control value information 7, the opening degree control value information 8, the gain value information 9, and the opening / closing speed control value information 10 are output to the distance measurement control unit 301, and the storage contents of the storage unit are updated.

Next, the operation of the distance measuring apparatus configured as described above will be described.
First, a normal monitoring operation will be described.
When receiving the start command signal 12 indicating the monitoring instruction signal from the operation start instruction unit 600, the distance measurement control unit 301 of the computer 300 causes the laser distance measuring device 100 and the monitoring camera 200 to perform a normal monitoring operation. Output monitoring signal.
When the distance measurement processing unit 105 of the laser distance measurement device 100 receives the laser distance measurement operation start signal 1 that is the start command signal 12 indicating the monitoring instruction signal from the distance measurement control unit 301, the laser distance measurement device 100 performs the laser distance measurement. Start operation.

First, the laser transmission unit 101 emits laser light toward an object via the transmission lens 102. The laser beam reflected from the object is received by the laser receiving unit 103 via the receiving lens 104. The distance measurement processing unit 105 outputs the output value information such as the emission time, emission angle, emission intensity, and frequency of the laser beam from the laser transmission unit 101, and the reception time, reception angle, and reception of the reflected laser beam from the laser reception unit 103. The received value information such as intensity is received, the time difference from when the laser beam is transmitted until it is received is calculated, and the distance to the object to be measured is calculated by dividing by the speed of the light.
The distance information 2 based on the calculation result is output to the display 500 and displayed on the display screen of the display 500.

On the other hand, when the monitoring camera 200 receives the start command signal 12 indicating the monitoring instruction signal from the distance measurement control unit 301, the monitoring camera 200 includes a laser light irradiation point of the object irradiated with the laser light from the laser distance measurement device 100. A monitoring operation for monitoring the surroundings based on the captured image information is started.
At the start of the monitoring operation, the filter of the filter switching unit 203 is set to the near-infrared cut filter 203a by the filter switching signal 4 from the distance measurement control unit 301, and the aperture control circuit 206, electronic shutter control circuit 207, AGC circuit 208, slow shutter. Each of the control circuits 209 receives aperture control value information 7, opening control value information 8, gain value information 9, and opening / closing speed control value information 10 from the ranging control unit 301, and aperture control based on these information 7 to 10 A value, an electronic shutter value, an AGC gain, and a slow shutter value are set as initial values.

  In this state, the amount of light of the optical image collected by the lens 201 is controlled by the diaphragm 202 and is input to the image sensor 204 via the near infrared cut filter 203a. The image sensor 204 photoelectrically converts the input optical image and outputs it to the video signal processing circuit 205. The video signal processing circuit 205 converts the photoelectrically converted image sensor 204 signal into a video signal. The converted video signal passes through the aperture control circuit 206, the electronic shutter control circuit 207, the AGC circuit 208, and the slow shutter control circuit 209, and the video information 11 is properly maintained and output to the display 500. Displayed on the screen.

  At this time, the aperture control circuit 206 outputs an aperture control signal 3 for controlling the aperture 202 to the aperture 202 so that the video signal from the video signal processing circuit 205 is optimized. The electronic shutter control circuit 207 outputs the electronic shutter control signal 5 to the image sensor 204 so that the video signal from the video signal processing circuit 205 is optimized. The AGC circuit 208 always outputs the gain value information 9 to the computer 300. The slow shutter control circuit 209 outputs a slow shutter control signal 6 to the image sensor 204.

As a result, the image displayed on the display screen of the display 500 is cut by the near-infrared cut filter 203a to cut light in the near-infrared region that is not visible to the human eye but to which the image sensor 204 reacts. Since it is controlled by the electronic shutter control circuit 207, the AGC circuit 208, and the slow shutter control circuit 209, an image with natural color reproduction is obtained.
When the monitoring operation ends, the aperture control value, the electronic shutter value, the AGC gain, and the slow shutter value at the end of the monitoring operation in the aperture control circuit 206, the electronic shutter control circuit 207, the AGC circuit 208, and the slow shutter control circuit 209 are the aperture control values. Information 7, opening control value information 8, gain value information 9, and opening / closing speed control value information 10 are output to the distance measurement control unit 301 and the storage contents of the storage unit are updated.

Next, the distance measuring operation will be described.
Upon receiving the start command signal 12 indicating the distance measurement instruction signal from the operation start instruction unit 600, the distance measurement control unit 301 of the computer 300 causes the laser distance measurement device 100 and the monitoring camera 200 to perform a distance measurement operation. A ranging operation start signal is output.
In the monitoring camera 200, as a first step, the filter of the filter switching unit 203 is set to the near-infrared cut filter 203a as in the normal monitoring operation, and the aperture control circuit 206, electronic shutter control circuit 207, AGC circuit 208, slow Each of the shutter control circuits 209 receives aperture control value information 7, opening control value information 8, gain value information 9, and opening / closing speed control value information 10 from the distance measurement control unit 301, and an aperture based on these information 7 to 10 The control value, electronic shutter value, AGC gain, and slow shutter value are set as initial values.

In this state, the AGC circuit 208 always outputs the gain value information 9 to the computer 300.
The AGC gain in the AGC circuit 208 is output as gain value information 9 to the distance measurement control unit 301.

The distance measurement control unit 301 of the computer 300 compares the AGC gain of the received gain value information 9 with a preset threshold value to determine the presence or absence of sunlight, and either the optical bandpass filter 203b or the optical filter 203c. Is output to the filter switching unit 203.
In the following, description will be given separately for the case where there is sunlight and the case where there is no sunlight, that is, the case of nighttime.

  In an environment with sunlight, the AGC gain of the AGC circuit 208 is small, and the AGC gain of the gain value information 9 from the AGC circuit 208 is lower than the threshold value. Based on this, it is determined that the environment has sunlight, and a filter switching signal 4 for selecting the optical bandpass filter 203b is output to the filter switching unit 203. Upon receiving this filter switching signal 4, the filter switching unit 203 moves the near-infrared cut filter 203 a from the facing position between the rear stage of the aperture 202 and the front stage of the image sensor 204 to the standby position, and the optical bandpass filter 203 b is moved. The position is moved from the standby position to a position opposite to the position between the rear stage of the aperture 202 and the front stage of the image sensor 204.

On the other hand, the distance measurement control unit 301 that has received the gain value information 9 whose AGC gain is lower than the threshold value from the AGC circuit 208 starts the start command signal 12 indicating a distance measurement instruction signal to the distance measurement processing unit 105 of the laser distance measuring device 100. The laser ranging operation start signal 1 is output. Upon receiving the laser ranging operation start signal 1, the laser distance measuring device 100 starts the laser ranging operation.
The laser distance measuring operation by the laser distance measuring device 100 is the same as the normal monitoring operation. The laser transmitting unit 101 emits laser light, and the laser receiving unit 103 receives the laser light reflected from the object. The processing unit 105 calculates the distance to the object, outputs the distance information 2 to the display 500, and displays it on the display screen of the display 500.

  As a result, in the monitoring camera 200, the amount of light of the optical image of the reflected laser light collected by the lens 201 is controlled by the diaphragm 202 and is input to the image sensor 204 via the optical bandpass filter 203b. The image sensor 204 photoelectrically converts the input optical image of the reflected laser beam and outputs it to the video signal processing circuit 205. The video signal processing circuit 205 converts the photoelectrically converted image sensor 204 signal into a video signal. The converted video signal passes through the aperture control circuit 206, the electronic shutter control circuit 207, the AGC circuit 208, and the slow shutter control circuit 209, and is output to the display 500 as the video information 11 by reflected laser light. Is displayed.

  Thus, since the optical bandpass filter 203b is used, the components of sunlight other than the vicinity of the near infrared region are attenuated, so that the object irradiated by the laser distance measuring device 100 can be photographed. Note that since sunlight also has a light component in the pass band of the optical bandpass filter 203b, the signal level of the video information by the reflected laser light is slightly lowered, but the object irradiated with the laser light from the laser distance measuring device 100 is used. The surrounding situation including the laser beam irradiation point can be confirmed. As a result, whether or not the laser irradiation point on the object irradiated by the laser distance measuring device 100 is irradiated to the distance measuring point is determined quickly and based on the video information 11 by the reflected laser light from the monitoring camera 200. It can be easily confirmed.

In an environment where there is no sunlight, the AGC gain of the AGC circuit 208 is large, and the AGC gain of the gain value information 9 from the AGC circuit 208 is higher than the threshold value. Based on this, it is determined that there is no sunlight, and the filter switching signal 4 for selecting the optical filter 203c is output to the filter switching unit 203. Upon receiving this filter switching signal 4, the filter switching unit 203 moves the near-infrared cut filter 203a from the opposed position between the rear stage of the diaphragm 202 and the front stage of the image sensor 204 to the standby position, and moves the optical filter 203c to the standby position. From the rear stage of the diaphragm 202 to the front stage of the image sensor 204.
The AGC circuit 208 generally operates at night when there is no sunlight. Therefore, the distance measurement control unit 301 can easily determine the presence or absence of sunlight by looking at the magnitude of the AGC gain of the AGC circuit 208. it can.

On the other hand, the distance measurement control unit 301 that has received the gain value information 9 with the AGC gain higher than the threshold value from the AGC circuit 208 starts the start command signal 12 indicating a distance measurement instruction signal to the distance measurement processing unit 105 of the laser distance measurement device 100. The laser ranging operation start signal 1 is output. Upon receiving the laser ranging operation start signal 1, the laser distance measuring device 100 starts the laser ranging operation.
The laser distance measuring operation by the laser distance measuring device 100 is the same as the normal monitoring operation. The laser transmitting unit 101 emits laser light, and the laser receiving unit 103 receives the laser light reflected from the object. The processing unit 105 calculates the distance to the object, outputs the distance information 2 to the display 500, and displays it on the display screen of the display 500.

  In the monitoring camera 200, the amount of light of the optical image of the reflected laser beam condensed by the lens 201 is controlled by the diaphragm 202 and input to the image sensor 204 via the optical filter 203c. The image sensor 204 photoelectrically converts the input optical image of the reflected laser beam and outputs it to the video signal processing circuit 205. The video signal processing circuit 205 converts the photoelectrically converted image sensor 204 signal into a video signal. The converted video signal passes through the aperture control circuit 206, the electronic shutter control circuit 207, the AGC circuit 208, and the slow shutter control circuit 209, and is output to the display 500 as the video information 11 by reflected laser light. Is displayed.

  Thus, since the optical filter 203c is used, the change in the optical path length (back focus) from the lens 201 to the image sensor 204 due to the movement of the near-infrared cut filter 203a from the facing position can be eliminated. The image sensor 204 can prevent the input optical image of the reflected laser light from being blurred, and the object irradiated by the laser distance measuring device 100 can be captured. As a result, whether or not the laser irradiation point on the object irradiated by the laser distance measuring device 100 is irradiated to the distance measuring point is determined quickly and based on the video information 11 by the reflected laser light from the monitoring camera 200. It can be easily confirmed.

  As described above, in the first embodiment, in the laser ranging operation, the optical bandpass filter 203b is used as the filter of the filter switching unit 203 in an environment with sunlight, and the filter switching is performed in an environment without sunlight. Since the optical filter 203c is used as the filter of the unit 203, the laser distance measuring device 100 irradiates on the basis of the video information 11 by the reflected laser light from the monitoring camera 200 in an environment with sunlight and an environment without sunlight. There is an effect that it is possible to confirm whether or not the laser irradiation point on the target object is irradiated to the distance measurement target point.

  In addition, in the first embodiment, in the laser ranging operation, the presence or absence of sunlight is determined depending on the level of the AGC gain of the AGC circuit 208 with the filter of the filter switching unit 203 set to the near-infrared cut filter 203a. Since either one of the optical bandpass filter 203b or the optical filter 203c is automatically selected as a filter of the filter switching unit 203 based on the determination result, the environment is determined whether or not sunlight is present. First, based on the video information 11 by the reflected laser light from the monitoring camera 200, it is possible to confirm whether or not the laser irradiation point on the object irradiated by the laser distance measurement device 100 is irradiated to the distance measurement target point. There is.

  When the monitoring operation ends, the aperture control value, electronic shutter value, AGC gain, and slow shutter value at the end of the monitoring operation in the aperture control circuit 206, electronic shutter control circuit 207, AGC circuit 208, and slow shutter control circuit 209 are reduced. The control value information 7, the opening control value information 8, the gain value information 9, and the opening / closing speed control value information 10 are output to the distance measurement control unit 301, the storage contents of the storage unit are updated, and the next monitoring operation and distance measurement operation are performed. , The storage content updated in the storage unit is output to the aperture control circuit 206, the electronic shutter control circuit 207, the AGC circuit 208, and the slow shutter control circuit 209, so that the video signal output from the monitoring camera 200 converges. Thus, the video information can be quickly restored in the monitoring operation and the distance measuring operation.

In the first embodiment, the laser distance measuring device 100 constitutes a laser distance measuring device function unit as a whole, but the distance measuring processing unit 105 in the laser distance measuring device 100 is provided on the computer 300 side, and the measurement provided in the computer 300 is performed. The distance processing unit 105 may constitute a laser distance measuring device function unit.
The surveillance camera 200 constitutes the surveillance camera function unit as a whole. The circuit after the video signal processing circuit 205 in the surveillance camera 200 is provided on the computer 300 side, and the circuit after the video signal processing circuit 205 provided in the computer 300 The surveillance camera function unit may be configured as described above.

  In the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

  DESCRIPTION OF SYMBOLS 100 Laser distance measuring device, 101 Laser transmission part, 103 Laser receiving part, 105 Distance measuring process part, 200 Surveillance camera, 201 Lens, 202 Diaphragm, 203 Filter switching part, 203a Near-infrared cut filter, 203b Optical band pass filter, 203c Optical filter, 204 Image sensor, 205 Video signal processing circuit, 206 Aperture control circuit, 207 Electronic shutter control circuit, 208 AGC circuit, 209 Slow shutter control circuit, 300 computer, 301 Measurement rejection control unit, 500 Display.

Claims (6)

A laser distance measuring device that emits laser light, receives laser light reflected from the object, and measures the distance to the object, and laser light irradiation of the object irradiated with the laser light from the laser distance measuring device It has a surveillance camera that captures the surroundings including points,
The surveillance camera is
An aperture to which an optical image collected by the lens is input;
An image sensor that photoelectrically converts an input optical image and outputs it as imaging information;
A near-infrared cut filter that is disposed between the diaphragm and the image sensor and cuts light in the near-infrared region, an optical bandpass filter that passes wavelengths in the near-infrared region of laser light, and the lens to the image sensor A filter switching unit in which any one of the optical filters for adjusting the optical path length is disposed to face between the diaphragm and the imaging device;
Ranging device having The surveillance camera is
An AGC circuit for receiving video information based on the image sensor;
2. The distance measuring apparatus according to claim 1, wherein the filter switching unit selects the optical bandpass filter and the optical filter based on a comparison result between an AGC gain of the AGC circuit and a threshold value.   The distance measuring device according to claim 1, wherein the near-infrared cut filter is selected in the initial state of the filter switching unit. The surveillance camera is
An electronic shutter control circuit that receives video information based on imaging information from the imaging element and outputs an aperture control signal for controlling an aperture value of the aperture to the aperture;
An electronic shutter control circuit that receives video information based on imaging information from the imaging element and outputs opening control value information for controlling an electronic shutter value indicating an opening degree of an electronic shutter in the imaging element to the imaging element;
An AGC circuit that receives video information based on imaging information from the imaging device and outputs gain value information including an AGC gain indicating a gain value, and the like;
A slow shutter control circuit that receives video information based on imaging information from the image sensor and outputs open / close speed control value information for controlling a slow shutter value indicating an open / close speed of an electronic shutter in the image sensor to the image sensor; And
Further, a memory for storing an aperture value based on the aperture control signal, an electronic shutter value based on the opening control value information, an AGC gain based on the gain value information, and a slow shutter value based on the opening / closing speed control value information. Part
In the initial value, the aperture value of the aperture is set to the aperture value stored in the storage unit, and the electronic shutter value and slow shutter value of the electronic shutter in the image sensor are stored in the electronic shutter value and slow mode stored in the storage unit. 2. The distance measuring device according to claim 1, wherein the AGC gain of the AGC circuit is set to the AGC gain stored in the storage unit.   5. The distance measuring apparatus according to claim 4, wherein the filter switching unit selects the optical bandpass filter and the optical filter based on a comparison result between an AGC gain of the AGC circuit and a threshold value.   6. The distance measuring apparatus according to claim 4, wherein the filter switching unit selects the near-infrared cut filter in an initial state.

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