JP2016138771A - One dimensional luminance distribution detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide one dimensional luminance distribution detection device capable of monitoring the presence or absence, the position, the operation state, the distance or the size of an object with a small installation cost without using a specific tag or a portable terminal, and further capable of being installed at a site requiring the protection of privacy, and even capable of monitoring by a wavelength of a specific range.SOLUTION: A one-dimensional luminance distribution detection device includes: line sensors 1L and 1R horizontally installed on a straight line at a position facing a monitoring object space at a predetermined distance w; rod lenses 12L and 12R vertically installed at the monitoring object space side at a predetermined distance f; and determination measurement means for determining the presence or absence or the position of the object 16 in the monitoring object space and capable of measuring the depth distance z or the size of the object 16 on the basis of a light intensity signal from the line sensors 1L and 1R.SELECTED DRAWING: Figure 10

Description

  The present invention is capable of grasping the presence / absence, position, or operation state of a subject or an object in a monitoring target space without using a two-dimensional image, and performing a distance measurement of the subject or the object. The present invention relates to an original luminance distribution detection device.

Two-dimensional images using a normal camera are used to grasp the presence or absence, position, or operating state of the target person or object in the monitoring target space, but it can be used at home from the viewpoint of privacy protection. Limited.
On the other hand, a method of converting a two-dimensional image into a one-dimensional image is also conceivable, but diversion or theft of two-dimensional image information occurs at the time when the two-dimensional image is obtained or after it is obtained, and privacy is infringed depending on the location where the image is obtained. There was a risk.

Therefore, there is a proposal for detecting the movement of the subject by arranging a plurality of pyroelectric sensors on the ceiling.
Further, in Patent Document 1 (Japanese Patent No. 5115991), a tag that emits an electromagnetic wave is attached to the surface of the subject, and a set with a tag reader senses the state of movement, or in the subject's action space. A proposal to collect information by installing tags with sensors is described.
Further, Patent Document 2 (Japanese Patent Application Laid-Open No. 2012-48335) describes a proposal for causing a subject to have a portable terminal and monitoring the subject based on information issued from the portable terminal 12.

Japanese Patent No. 5115991 JP 2012-48335 A

However, the proposed one in which a plurality of pyroelectric sensors are arranged on the ceiling to detect the movement of the subject requires large-scale refurbishment for installation of the apparatus, and the installation cost is high.
In addition, the proposal described in Patent Document 1 may be annoying to attach a tag to the subject and may have an adverse effect on the pacemaker. The proposal described in Patent Document 2 is carried by the subject. It was impossible to monitor without a terminal.

Therefore, prior to the present invention, the present inventors placed a line sensor on the focal length of the rod lens for the purpose of grasping the presence / absence, position or operating state of the object in the monitoring target space. A study to obtain the distribution was conducted.
However, with this method, the distance from the rod lens to the object is unknown, and the size of the object cannot be determined. Therefore, depending on the sensor installation environment, luggage or pets of completely different sizes can be monitored by humans. There was a problem that there was a possibility of false detection as a target.
In addition, since the detection range and distance are limited by the focal length and size of the rod lens, there is also a problem that the application range is limited.
Therefore, the present invention provides a one-dimensional luminance distribution detection device that can monitor the presence / absence, position, operating state, distance, or size of an object person or object without using a special tag or portable terminal at a low installation cost. Providing a one-dimensional luminance distribution detection device that can be installed in a place where privacy protection is required even though the luminance distribution in a three-dimensional expansive space can be monitored; and a rod lens and a line sensor The object of the present invention is to solve the problems of the one-dimensional luminance distribution detection device used, to take advantage of its advantages, and to enable monitoring with a specific range of wavelengths.

  The invention according to claim 1 is a one-dimensional luminance distribution detection device for monitoring the presence or absence, position, or operating state of a subject or an object in a monitoring target space, and one sensor plane facing the monitoring target space A pair of line sensors installed in parallel or on a straight line at a certain distance above, and a pair of slits or rod-like lenses installed at a predetermined distance on the monitoring target space side of the pair of line sensors, respectively Based on light intensity signals from a plurality of light receiving elements arranged in the longitudinal direction of the pair of line sensors, the presence or absence of a subject or an object in the monitoring target space, or along the longitudinal direction of the monitoring target space Light from a plurality of light receiving elements arranged in a longitudinal direction of the pair of line sensors and a discriminating means for discriminating the position of the subject or the object in the direction A distance measuring means for measuring a distance between a subject or an object in the monitoring target space and a plane including the pair of slits or rod lenses based on a degree signal, and the pair of slits or rod lenses respectively correspond to each other It is characterized by being arranged in the same relationship at the position of twist with respect to the line sensor.

  According to a second aspect of the present invention, in the one-dimensional luminance distribution detecting device according to the first aspect, based on the distance measured by the distance measuring unit and the light intensity signals from the plurality of light receiving elements, A size measuring means for measuring the size of the object is provided.

  The invention according to claim 3 is the one-dimensional luminance distribution detection device according to claim 1 or 2, wherein each of the pair of slits or rod-shaped lenses includes a straight line extending in the longitudinal direction of the corresponding line sensor. It is characterized by being orthogonal to an extension plane extending to the space side.

According to the one-dimensional luminance distribution detecting apparatus of the invention according to claim 1, a pair of line sensors installed in parallel or on a straight line with a certain distance on one sensor plane facing the monitoring target space, and a pair Based on light intensity signals from a pair of slits or rod-shaped lenses installed at a predetermined distance on the monitoring target space side of the line sensor and a plurality of light receiving elements arranged in the longitudinal direction of the pair of line sensors Since it is possible to determine the presence / absence or position of the object in the monitoring target space simply by providing a determination means for determining the presence / absence or position of the target person or object (hereinafter simply referred to as “target”), a special tag or mobile terminal can be used. Without using, it is possible to monitor the presence / absence and position of the object at a small installation cost.
In addition, despite the fact that it is possible to monitor the presence and location of objects in a three-dimensional expansive space, the information obtained is only one-dimensional luminance distribution information, so it can be used in places where privacy needs to be protected. Can be installed.
Furthermore, a distance measuring unit that measures the distance between the target and a plane including the pair of slits or the rod-shaped lens based on light intensity signals from a plurality of light receiving elements arranged in the longitudinal direction of the pair of line sensors is provided. Therefore, the movement of the object in the front-rear direction can also be detected.
When a pair of slits is used, the detection distance is not limited, and the detection range can be changed only by changing the length of the slit or the distance between the line sensor and the slit. When the rod-shaped lens is used, it is possible to accurately detect the target existing in the monitoring target space.

  According to the one-dimensional luminance distribution detection device of the invention of claim 2, in addition to the effect of the invention of claim 1, the size measuring means for measuring the size of the object is provided. It is possible to prevent an object from being erroneously detected as an object to be monitored.

According to the one-dimensional luminance distribution detecting device of the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, each of the pair of slits or rod-like lenses is a straight line extending in the longitudinal direction of the corresponding line sensor. In the case where the luminance distribution in the monitoring target space is uniform, the output luminance distribution information is symmetric in the longitudinal direction of the line sensor.
Therefore, calculation processing is easy when determining the position, distance, or size of the target, and accurate determination can be made regardless of the position of the target in the longitudinal direction of the line sensor.

The figure which shows the relationship of the light which injects into the line sensor 1 from the line sensor 1, the slit 2, and the monitoring object space 3. FIG. The horizontal sectional view of the line sensor 1, the slit 2, and the monitoring target space 3. The graph which shows the light intensity detected by each light receiving element of the line sensor 1 when a target does not exist in the monitoring target space 3. The graph which shows the light intensity detected by each light receiving element of the line sensor 1 when a target is located on the right side of the monitoring target space 3. 6 is a graph showing the light intensity detected by each light receiving element of the line sensor 1 when the target is located in the center of the monitoring target space 3. 6 is a graph showing the light intensity detected by each light receiving element of the line sensor 1 when the target is located on the left side of the monitoring target space 3. The figure which shows the whole structure of the one-dimensional luminance distribution detection apparatus using a slit. The perspective view of the state which made the slit lens 14 hold | maintain the rod lenses 12L and 12R. Sectional drawing of the state which made the slit lens hold | maintain the rod lenses 12L and 12R. The figure which shows the principle which detects the depth distance of object. An example of a histogram in case the distance to an object is 1 m and the distance between sensors is 20 cm and 40 cm. An example of a histogram in case the distance to an object is 2 m and the distance between sensors is 20 cm and 40 cm. The figure which shows the whole structure of the one-dimensional luminance distribution detection apparatus which concerns on an Example.

  Before describing the embodiment of the present invention, the principle of monitoring the presence or position and the position of a target in a three-dimensional expansive space by a one-dimensional luminance distribution detection device using a slit will be described.

FIG. 1 is a diagram showing a relationship between light incident on the line sensor 1 from the line sensor 1, the slit 2, and the monitoring target space 3 of the one-dimensional luminance distribution detection apparatus using slits.
The line sensor 1 has a length of 28.5 mm and 2068 light receiving elements arranged in the longitudinal direction, and is installed almost horizontally.
The slit 2 is formed by forming an elongated hole having a length of 11 mm and a width of 1 mm parallel to the side of the flat plate having a width of 40 mm, a height of 25 mm, and a thickness of 1 mm, and extending in the longitudinal direction of the line sensor 1. 4 and intersects the extension plane 5 extending horizontally toward the monitoring target space 3 perpendicularly. That is, the slit 2 is arranged in the vertical direction.
Further, the extension plane 5 and the slit 2 intersect at the center of the slit 2.

  As shown in FIG. 1, when it is assumed that the back surface of the monitoring target space 3 is a flat wall 6, the monitoring target space 3 whose luminance can be measured by the line sensor 1 is the left end of the line sensor 1 and the lower end of the slit 2. A straight line passing through the wall 6, a point L1 where the straight line passing through the right end of the line sensor 1 and the lower end of the slit 2 intersects the wall 6, and a straight line passing through the left end of the line sensor 1 and the upper end of the slit 2 And a straight line passing through the right end of the line sensor 1 and the upper end of the slit 2, a point L 3 intersecting the wall 6, a space surrounded by six points, the lower end of the slit 2 and the upper end of the slit 2.

As shown in FIG. 2, the width X and height Y of the wall 6 of the monitoring target space 3 are set such that the length of the line sensor 1 is x, the length of the slit 2 is y, the distance between the line sensor 1 and the slit 2 is d, When the distance between the slit 2 and the wall 6 is D and the width s of the slit 2 is ignored, it is expressed by the following equation.
X = x × D / d
Y = y × D / d

Note that the detectable width X is also related to the width s of the slit 2 and the thickness t of the flat plate. If the detectable angle is θ (deg), θ and X can be obtained by the following equations.
θ = arctan {d / (x / 2 + s / 2)}
However, the lower limit is arctan (t / s)
X = 2 × D × tan (90 ° −θ)
Here, in the actual one-dimensional luminance distribution detection device, d = 15.47 mm, t = 1 mm, and x = 28.5 mm. Therefore, when these values are substituted into the above equation and s = 0, θ = 47 °.
Since s at which arctan (1 / s) is 47 ° is calculated as 0.92 mm, the detection angle θ does not reach the lower limit if s is 0.92 mm or more. Therefore, the slit width is set to 1 mm in the actual one-dimensional luminance distribution detection apparatus.

  When there is no object in the monitoring target space 3, the light intensity incident on the light receiving element S1 at the left end of the line sensor 1 is reflected by the wall on the line from R1 through R2 to R3 as shown in FIG. The light intensity incident on the light receiving element S2 at the center of the line sensor 1 is also the sum of the light intensities reflected from the wall on the line from C1 to C2 to C3 in FIG. Thus, the intensity of light incident on the light receiving element S3 at the right end of the line sensor 1 is the sum of the intensities of light reflected by the wall on the line from L1 to L2 in FIG.

FIG. 3 is a graph of ADU values corresponding to the amount of charge generated in each light receiving element when there is no target in the monitoring target space 3. The horizontal axis indicates the number of the light receiving element from the left side, and the unit of the vertical axis is ADU.
Since the amount of charge generated in the light receiving element varies depending on the intensity of incident light, FIG. 3 can be said to be a graph showing the light intensity detected by each light receiving element.

FIG. 4 is a graph similar to FIG. 3 when a target exists on the right side of the monitoring target space 3.
Usually, since the reflectance of the object is lower than that of the wall, as can be seen from FIG. 1, when the object exists on the right side of the monitoring target space 3, the left side of the line sensor 1 corresponding to the position where the object exists. Therefore, the light intensity detected by the light receiving element located at the lower position is lowered.
Therefore, the ADU value is lower than the graph of FIG. 3 indicated by a dotted line in a part on the left side of the graph.

FIG. 5 is a graph similar to FIG. 3 when the target exists in the center of the monitoring target space 3.
In this case, the ADU value is lower than the graph of FIG. 3 indicated by a dotted line in the center of the graph.

FIG. 6 is a graph similar to FIG. 3 when a target exists on the left side of the monitoring target space 3.
In this case, the ADU value is lower than the graph of FIG. 3 indicated by a dotted line in a part on the right side of the graph.

4 to 6, the ADU value of the portion corresponding to the position is lowered depending on where the target is in the left-right direction of the monitoring target space 3, but when the target emits light or reflected If the rate is high, the ADU value may increase from the graph of FIG.
However, in any case, if there is a target, some variation occurs in the graph of FIG. 3, so the difference between the ADU value (reference value) and the actually measured ADU value in the graph of FIG. If verified, it is possible to determine where the target exists in the left-right direction of the monitoring target space 3.
Further, in the one-dimensional luminance distribution detection device shown in FIG. 1, the sum of the light intensities in the vertical direction of the monitoring target space 3 is detected by each light receiving element, so that when the standing object falls down and lies down, The ADU value at a position where the direction is limited changes from a very low state to a state where the ADU value at a position where the object in the left-right direction is tilted is slightly low. Then, by grasping such a change in the ADU value, it can be determined that the object has changed from a standing state to a lying state.

FIG. 7 is a diagram illustrating an overall configuration of a one-dimensional luminance distribution detection apparatus using a slit.
The one-dimensional luminance distribution detection device corresponds to the slit 2 that narrows down the light from the monitoring target space 3, the line sensor 1 that detects the intensity of the light that has passed through the slit 2, and the amount of light received by each light receiving element of the line sensor 1. A determination means 7 is provided for receiving the light intensity signal, determining presence / absence, position, and operation state of the object in the monitoring target space 3, and transmitting video information for notification thereof.

  The discriminating means 7 stores the received light intensity signal as time series data for each light receiving element, discriminates the presence / absence and position of the object based on the light intensity signal at the temporary point, and also provides the time series light intensity. A CPU 8 that determines a target operating state based on the signal, creates notification information based on the determination result, and a display control unit 10 that transmits image information to the display unit 11 based on the notification information from the CPU 8. ing.

The display unit 11 receives image information from the display control unit 10 and displays information about the presence / absence, position, and operation state of the target, and may be provided together with the one-dimensional luminance distribution detection device. You may provide in the position away from the one-dimensional luminance distribution detection apparatus.
The display device 11 displays the presence / absence, position, and operation state of the target. The display mode includes (1) display with characters and symbols, and (2) area display indicating the monitoring target space 3, There are a visual display for displaying an image according to the presence or absence and position of an object in the area display, and (3) a display in which the light intensity signal is graphed.
Then, one or a plurality of displays may be appropriately selected from these display modes according to the needs of the user and displayed.

Further, since the discriminating means 7 has the storage means 9, by adding an instruction input means for the discriminating apparatus 7, information on the presence / absence, position, and operating state of the object at the past designated time is displayed on the display means 11. Can also be displayed.
Furthermore, by continuously displaying the presence / absence and position of the object at a predetermined time before or after the designated time, the operation state of the object can be tracked.
In such a case, if the predetermined time is long, the movement state of the target over a long period of time can be traced in a short time. Conversely, if the predetermined time is short, the detailed movement of the movement state of the target particularly in the time to be watched is traced. It can be performed.

  Hereinafter, embodiments of the present invention will be described by way of examples.

  FIG. 8 is a perspective view of the state in which the rod lenses 12L and 12R are held on the slit plate 14 of the one-dimensional luminance distribution detection apparatus according to the embodiment, and FIG. 9 is a state in which the rod lenses 12L and 12R are also held on the slit plate 14. 1 and 2 is different from the one-dimensional luminance distribution detection device shown in FIGS. 1 and 2 in that two slits 2L and 2R are provided in the slit plate 14, and rod lenses 12L are provided in the slits 2L and 2R, respectively. 12R is detachably held and line sensors 1L and 1R are arranged in the same positional relationship as in FIGS. 1 and 2, respectively.

The one-dimensional luminance distribution detection apparatus according to the embodiment includes mount members 13L and 13R on the back side of the slits 2L and 2R, and the rod lenses 12L and 12R, only visible light or infrared light by the mount members 13L and 13R. A cover body (not shown) that is permeable only to each other can be detachably held.
8 and 9, the rod lenses 12L and 12R are inserted from above the lens passing portions 15L and 15R provided on the slit plate 14, and are held between the slits 2L and 2R and the mount members 13L and 13R. Show.
The rod lenses 12L and 12R can be removed from the slit plate 14 by being pulled out from the lens passing portions 15L and 15R from this state.
Although not shown, the cover body is a rectangular plate having the same length as the rod lenses 12L and 12R, and is held between the slits 2L and 2R and the mount members 13L and 13R by being inserted from above the slit plate 14. It can be removed from the slit plate 14 by pulling upward.

In the embodiment, between the slits 2L and 2R and the mount members 13L and 13R, (1) a state in which nothing is held, (2) a state in which a cover body is held, and (3) a rod lens 12L, 12R is held. The state can be changed to (4) a state in which the rod lens and the cover body are held.
Therefore, it is possible to select any state from the above (1) to (4) according to the monitoring purpose and environment, and to accurately monitor the presence / absence, position, or operation state of the target.
In order to obtain the state of (4) above, the rod lens needs to be sandwiched between the slits 2L, 2R and the cover body, so a lens having a smaller diameter than the rod lenses 12L, 12R is used. .

Here, the states (1) and (2) are suitable for monitoring a target in a wide monitoring target space, and the states (3) and (4) are accurate for a target in a limited monitoring target space. Suitable for monitoring well.
In addition, the states (2) and (4) are suitable when the monitored space is bright if the cover body can transmit only visible light, and if the cover body can transmit only infrared light. This is suitable when the monitoring target space is dark and the monitoring target emits infrared rays.

The graph of the ADU value in any of the above (1) to (4) states that when there is no target in the monitoring target space, when there is a target on the right side of the monitoring target space, the target is in the center of the monitoring target space. When the target exists and when the target exists on the left side of the monitoring target space, the same tendency as the graphs of FIGS.
However, the graph of the ADU value in the states (3) and (4) above is the case where the slits 2L and 2R are used as in the state (1) or (2) as in the one-dimensional luminance distribution detection device using the slits. Compared to the above, since more light can be collected by the rod lenses 12L and 12R, a larger ADU value can be obtained in the same monitoring target space, and the resolution of the luminance distribution is increased. As a result, erroneous detection is reduced and many state determinations are possible.

FIG. 10 is a diagram illustrating the principle of detecting the depth distance of an object.
The line sensors 1L and 1R and the rod lenses 12L and 12R are arranged so that the distance between the center and the center and the distance between the center line and the center line (hereinafter referred to as “inter-sensor distance”) are w. 12L and 12R are arranged at a distance f on the monitoring target space side in the center of the line sensors 1L and 1R, respectively.
In FIG. 10, the target 16 exists in the monitoring target space, and light reflected or emitted from the background, the target 16, and other objects existing in the monitoring target space is the rod lens through the same path as in FIG. 1. The light passes through 12L and 12R and enters the line sensors 1L and 1R, respectively.

For example, light from a linear region (hereinafter simply referred to as a “linear region”) extending above and below the target 16 passes through the optical paths 17L and 17R and is incident on the line sensors 1L and 1R, and is received by the light receiving elements gL and gR, respectively. When detected, the distance z (hereinafter referred to as “target depth distance”) between the plane including the center line of the rod lenses 12L and 12R and the linear region of the object 16 is obtained by the following equation.
z = f × w / (xL + xR)
Here, xL is the distance between the light receiving element cL and the light receiving element gL at the center (1034th from the left end) of the line sensor 1L, and xR is the light receiving element cR and the light receiving element gR at the center (1034th from the left end) of the line sensor 1R. Is the distance.
Therefore, if it is possible to determine which light receiving element of the line sensors 1L and 1R has detected the light from the specific linear region, the depth distance of the target where the specific linear region exists can be obtained.

Since the rod lenses 12L and 12R and the line sensors 1L and 1R are arranged close to each other, the luminance distribution obtained by the line sensors 1L and 1R is the same as that shifted to the left and right. When a singular value is detected by gL and a singular value is detected by the light receiving element gR in the line sensor 1R, the linear region corresponding to the light receiving element gL and the linear region corresponding to the light receiving element gR are the same linear region. Since it is estimated, the depth distance of the object can be obtained by extracting the light receiving elements gL and gR in which the respective singular values are detected.
In detecting the singular value, it is preferable to use the absolute value of the difference between the reference ADU value and the actually measured ADU value and use the peak value.
If not, the peak value can be easily extracted, and the linear region corresponding to the light receiving element in which the peak value is detected is a specific linear region that is very dark or very bright with respect to the background. This is because it is estimated that.

FIG. 11 is an example of a histogram when the distance to the object is 1 m and the distance between sensors w is 20 cm and 40 cm. FIG. 12 is the distance to the object is 2 m, and the distance between sensors w is 20 cm and 40 cm. It is an example of the histogram in a case.
This histogram shows the ADU value of the measured luminance (background luminance) of the monitoring target space when the target does not exist or before the target moves, and the monitoring target space when the target exists or after the target moves. The distribution of the absolute value of the difference between the measured luminance (variable luminance) and the ADU value (hereinafter referred to as “ADU differential value”).
When the target moves in the monitoring target space or the target that has stopped in the monitoring target space moves, the ADU difference value becomes a relatively large value in the region where the target exists, and the target exists. A relatively small value is obtained in the non-applied area.
In addition, the linear area corresponding to the light receiving element having the maximum ADU difference value in this histogram is a linear area that is very dark or very bright with respect to the background.

Next, a method for measuring the target depth distance from the histogram will be described.
For example, in FIG. 11A, xL is calculated from the distance between the light receiving element corresponding to the peak value of the ADU difference value in the line sensor 1L and cL, and the light receiving element corresponding to the peak value of the ADU difference value in the line sensor 1R and cR. XR can be obtained from the distance to.
Then, since the inter-sensor distance w and the distance f are known values according to the specifications of the one-dimensional luminance distribution detection device, f, w and the obtained values of xL and xR are obtained by the formula of f × w / (xL + xR). The depth distance of the object can be calculated by substituting.
The depth distance (measurement distance) of the object calculated from the histograms of FIGS. 11 (a) and 11 (b) where the depth distance of the object is 1 m and FIGS. 12 (a) and 12 (b) where the depth distance is 2 m is as follows. .
Measurement distance in FIG. 11A: 1.2 m (Distance between sensors w: 20 cm, error 0.2 m)
Measurement distance in FIG. 11B: 1.14 m (inter-sensor distance w: 40 cm, error 0.14 m)
Measurement distance in FIG. 12A: 1.57 m (inter-sensor distance w: 20 cm, error 0.43 m)
Measurement distance in FIG. 12B: 1.79 m (inter-sensor distance w: 40 cm, error 0.21 m)
The distance f is 8 mm in any case.

From these results, when the inter-sensor distance w is 40 cm, the maximum difference between the actual depth distance and the measurement distance is 0.21 m, and the rod lenses 12L and 12R and the line sensors 1L and 1R are arranged side by side. It was confirmed that the depth distance of the object can be measured without causing a large error by the one-dimensional luminance distribution detection device.
Also, from the comparison of the measurement distances in FIGS. 11 and 12, it can be seen that the error becomes smaller when the actual depth distance is small, and FIGS. 11 (a) and 11 (b) and FIGS. 12 (a) and 12 (b). From the comparison of the measurement distances in FIG. 5, it was found that the error decreases when the inter-sensor distance w is large.
This is because as the actual depth distance is smaller and the inter-sensor distance w is larger, the distances xL and xR that are the distances between the centers of the line sensors 1L and 1R and the light receiving element where the peak value of the ADU difference value occurs are larger. It is thought to be.

  Although the measurement results when the slits 2L and 2R are used instead of the rod lenses 12L and 12R are omitted, the peak value of the ADU difference value decreases and the error increases, but by increasing the inter-sensor distance w, There is no major obstacle to the distance measurement of the monitoring target existing relatively close.

Furthermore, by using the fact that the target has moved in the monitoring target space or moved in the monitoring target space, a relatively large ADU difference value is generated in the region where the target exists, The size of the target line sensor in the longitudinal direction can be obtained.
That is, when an object having a length of 1 m in the longitudinal direction of the line sensor moves to a depth distance of 1 m, a positive value including a relatively large ADU difference value continues in the α mm region in the line sensor. If the measurement distance is βm and the length of the region where the positive value including the relatively large ADU difference value continues is γmm, the size δm in the longitudinal direction of the target line sensor can be obtained by the following equation.
δ = γ / α × β

FIG. 13 is a diagram illustrating an overall configuration of the one-dimensional luminance distribution detection apparatus according to the embodiment.
The one-dimensional luminance distribution detection apparatus according to the embodiment detects the intensity of light that has passed through the slits 2L, 2R or the rod lenses 12L, 12R and the slits 2L, 2R, or the rod lenses 12L, 12R for narrowing light from the monitoring target space. Receiving the light intensity signals corresponding to the received light amounts of the line sensors 1L and 1R and the light receiving elements of the line sensors 1L and 1R, determining the presence / absence, position and operating state of the target in the monitoring target space, and notifying the notification A discriminating means for transmitting video information to be performed; a depth distance measuring means for measuring the depth distance of the object in the monitoring target space; and a size measuring means for measuring the size of the target line sensor in the longitudinal direction. Yes.
The discrimination means, depth distance measurement means, and size measurement means are collectively referred to as discrimination measurement means 22.

  The discriminating / measuring unit 22 stores the received light intensity signal as time-series data for each light receiving element, the presence / absence determination and position determination of the object based on the light intensity signal at a temporary point, and the time-series light intensity signal. Based on the operating state determination of the target based on the above, holding the background luminance distribution immediately before the luminance distribution based on the time series data for each light receiving element stored in the storage means 19 fluctuates, holding and holding the fluctuation luminance distribution based on the simultaneous series data CPU 18 for measuring the depth distance and size of the object based on the absolute value distribution of the difference between the background luminance distribution and the fluctuation luminance distribution, and generating notification information based on the determination result and measurement result, and notification from CPU 18 The display control unit 20 transmits image information to the display unit 21 based on the information.

The display means 21 receives image information from the display control means 20 and displays information about the presence / absence, position, operation state, depth distance and size of the target, together with the one-dimensional luminance distribution detection device. You may provide, and you may provide in the position away from the one-dimensional luminance distribution detection apparatus.
The display device 21 displays the presence / absence, position, operation state, depth distance, and size of the target. The display mode includes (1) display using characters and symbols, and (2) area display indicating the monitoring target space. And a visual display for displaying an image in accordance with the presence / absence, position, depth distance, and size of the object in the area display, and (3) a display in which the light intensity signal is graphed.
Then, one or a plurality of displays may be appropriately selected from these display modes according to the needs of the user and displayed.

In addition, since the discriminating measurement means 22 has the storage means 19, by adding an instruction input means for the discriminating measurement apparatus 22, the presence / absence, position, operation state, depth distance and size of the object at the past designated time. Information about the length can be displayed on the display means 21.
Furthermore, by continuously displaying the presence / absence, position, depth distance, and size of the object at a predetermined time before or after the specified time, the operation state of the object can be tracked.
In such a case, if the predetermined time is long, the movement state of the target over a long period of time can be traced in a short time. Conversely, if the predetermined time is short, the detailed movement of the movement state of the target particularly in the time to be watched is traced. It can be performed.

The modification regarding the one-dimensional luminance distribution detection apparatus of an Example is listed.
(1) In the embodiment, the line sensors 1L and 1R are arranged in the horizontal direction, and the slits 2L and 2R and the rod lenses 12L and 12R are arranged in the vertical direction. The slits 2L and 2R and the rod lenses 12L and 12R may be arranged in the horizontal direction.
In such a case, it is possible to determine where the object exists in the vertical direction, and to measure the size of the object in the vertical direction.
For example, if the one-dimensional luminance distribution detection device is installed toward the stairs, it is possible to determine the situation where the object is climbing up and down the stairs, the situation where the object is dropped from the stairs, and the like.
Also, using two one-dimensional luminance distribution detection devices, one one-dimensional luminance distribution detection device has line sensors 1L and 1R in the horizontal direction, and the other one-dimensional luminance distribution detection device has line sensors 1L and 1R in the vertical direction. If it arrange | positions, it can discriminate | determine where the object exists in the left-right direction and an up-down direction, and can measure the magnitude | size in the left-right direction and an up-down direction of an object.
Accordingly, it is possible to analyze the movement in the oblique direction in the monitoring target space.
(2) In the embodiment, the line sensors 1L and 1R are arranged in the horizontal direction, and the slits 2L and 2R and the rod lenses 12L and 12R are arranged in the vertical direction, but the line sensors 1L and 1R are formed in a cross shape and a T shape. Alternatively, it may be L-shaped, and the slits 2L, 2R and the rod lenses 12L, 12R may be similarly cross-shaped, T-shaped, or L-shaped.
In such cases, the light intensity detected by the horizontal line sensor is used to determine where the target is located in the left-right direction, the size in the left-right direction is measured, and the light detected by the vertical line sensor. It is possible to determine where the target is present in the vertical direction using the intensity and measure the size in the vertical direction.
(3) In the embodiment, the line sensors 1L and 1R are arranged in the horizontal direction, and the slits 2L and 2R and the rod lenses 12L and 12R are arranged in the vertical direction, but the slits 2L and 2R and the rod lenses 12L and 12R or the primary are arranged. The entire original luminance distribution detection device may be arranged so as to be rotated around an axis perpendicular to the surface of the slit plate 14.
In such a case, the sum of the light intensities along the line that obliquely crosses the monitoring target space is incident on the light receiving elements of the line sensors 1L and 1R, so that the object moves in the vertical direction or in the horizontal direction. The light intensity detected by the line sensors 1L and 1R changes.
Therefore, two one-dimensional luminance distribution detection devices are used as described in (1) above, or a cross-shaped, T-shaped or L-shaped line sensor is used as described in (2) above. In addition, it is possible to determine the movement of the object in the left-right direction and the up-down direction.
(4) The discriminating and measuring means 22 of the embodiment includes a storage means 19 for storing the received light intensity signal as time series data for each light receiving element, and can discriminate the operation state of the object based on the time series light intensity signal. However, if only the presence / absence, position, depth distance, and size of the current target need be detected or measured, the storage means 19 and the function for determining the operation state are not necessary.
In that case, the data obtained by measuring in advance is used for the background luminance distribution.
Even if the discriminating / measuring unit 22 is not provided with the storage unit 19 or the operating state discriminating function, information on the presence / absence, position, distance or size of the target or the light intensity signal of each light receiving element is predetermined from the discriminating / measuring unit 22. It is also possible to discriminate the operation state of the object by accumulating and analyzing the information in a time series by the analyzing device that transmits the information to another analyzing device at a period and receives the information.
(5) In the embodiment, the presence / absence, position, operation state, depth distance, and size of the target are reported by the display unit 21, but a speaker may be provided instead of or in addition to the display unit 21.
In such a case, sound notification can be performed instead of or in addition to image notification.

DESCRIPTION OF SYMBOLS 1, 1L, 1R Line sensor 2, 2L, 2R Slit 3 Monitoring object space 4 Straight line extended in the longitudinal direction of line sensor 1 5 Extension plane extended horizontally toward monitoring object space 3 6 Wall 7 Discriminating means 8 CPU 9 Storage means DESCRIPTION OF SYMBOLS 10 Display control means 11 Display means 12L, 12R Rod lens 13L, 13R Mount member 14 Slit plate 15L, 15R Lens passage part 16 Object 17L, 17R Optical path 18 CPU 19 Storage means 20 Display control means 21 Display means 22 Discriminating measurement means d Line D Distance between sensor 1 and slit 2 D Distance between slit 2 and wall 6 s Width of slit 2 x Length of line sensor 1 X Width of wall 6 f Distance between rod lenses 12L, 12R and line sensors 1L, 1R w Distance between sensors z Depth distance xL of the object Distance xR between the light receiving element cL and the light receiving element gL Distance between element cR and light receiving element gR

Claims (3)

A one-dimensional luminance distribution detection device for monitoring the presence or absence, position, or operation state of a subject or an object in a monitoring target space,
A pair of line sensors installed in parallel or in a straight line at a certain distance on one sensor plane facing the monitoring target space;
A pair of slits or rod-shaped lenses installed at a predetermined distance on the monitoring target space side of the pair of line sensors,
Based on light intensity signals from a plurality of light receiving elements arranged in the longitudinal direction of the pair of line sensors, the presence or absence of a subject or an object in the monitoring target space, or a direction along the longitudinal direction of the monitoring target space Discriminating means for discriminating the position of the subject or the object in
Based on light intensity signals from a plurality of light receiving elements arranged in the longitudinal direction of the pair of line sensors, a distance between a subject or an object in the monitoring target space and a plane including the pair of slits or rod lenses A distance measuring means for measuring
The pair of slits or rod-shaped lenses are arranged in the same relationship at twisted positions with respect to the corresponding line sensors, respectively. The apparatus according to claim 1, further comprising: a size measuring unit that measures the size of the subject or the object based on the distance measured by the distance measuring unit and light intensity signals from the plurality of light receiving elements. The one-dimensional luminance distribution detection apparatus described in 1. The pair of slits or rod-shaped lenses each include a straight line extending in the longitudinal direction of the corresponding line sensor and perpendicular to an extension plane extending toward the monitoring target space. The one-dimensional luminance distribution detection apparatus described.