JP2010009847A - Automatic lighting control type illumination system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination control system capable of carrying out highly reliable lighting control by reducing the number of times of incorrect detection of moving objects other than human or the like when detecting a person by using an image sensor and carrying out control of a luminaire group. <P>SOLUTION: The automatic lighting type illumination system includes the image sensor 100 detecting an image, a calculating part 200 calculating positional data of a person on the basis of a detection result of the image sensor, and a control part 300 controlling lighting of a light source on the basis of a calculation result of the calculating part. It is characterized in that it includes a first storage part 400 storing the detection result of the image sensor as standard data, and a second storage part 500 prestoring a locus of a mass of luminance decided to be human, and if it is decided by the calculating part that circulation data obtained from comparison with the detection result by the image sensor and the standard data is the same as standard circulation data stored in the second storage part, the control part controls lighting of the light source on the basis of the calculation result of the calculating part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an automatic lighting control type lighting system, and more particularly to a lighting device that detects the state of a person existing in a lighting space and controls lighting or dimming of an indoor lighting fixture based on the detection result.

There has been proposed an illumination control device that discriminates the presence / absence of a person in a room, a staying position, and the like by an image sensor installed on the ceiling of the living room, and appropriately blinks and dimms each lighting device in the room.
A human detection method using an image sensor includes a difference between a reference image (background image) (a) prepared in advance, which is called a background difference method, and a current input image (b), as shown in FIG. There is a method for detecting a target person by binarization.
Also, there is a technique called an inter-frame difference method that obtains an object to be processed by taking a difference between an input image at time (t) and an input image at time (t−n).
Both are performed by comparing two or more images captured at a certain time interval and identifying a portion that has changed, that is, a certain luminance (pixel) block that can be regarded as moving. When a person moves and stops still, the above procedure will not be able to detect despite the presence of a person, so it will be judged that the previously moving luminance block is still human. This is avoided by introducing a simple judgment circuit.

  However, other than human beings that move within the field of view of the image sensor (within the image), for example, there are curtains and blinds that sway with the wind from the window. In some cases, there is a case where a malfunction occurs in which the lighting apparatus is lit even though the person is absent. Unnecessary lighting leads to wasteful power consumption, and should be avoided as much as possible.

  Conventionally, it has a sensor capable of measuring indoor electromagnetic radiation, preferably visible light and infrared light, and a controller for controlling indoor lighting in accordance with the measured electromagnetic radiation, the sensor taking an electrical image of the room. An illumination control device having a video sensor using a solid-state imaging device such as a CCD (charge coupled device) sensor that can be formed has been proposed (Patent Document 1).

In the above-mentioned patent document, it is described that the control means can control illumination according to the following characteristic values or has the following means.
-Visible light emission value at a predetermined part of the image-Color temperature value of the image-Contrast between the radiation values of the image-Motion detection means-Object recognition means-Remote control device In the above device that can respond to the emitted signal, the position of the window that can be seen in the camera image is specified in advance, and when light is observed near that position, it is excluded from the normal processing system and the lighting fixture malfunctions. Is to prevent. In addition, a threshold level of light intensity (reference value) is set, and the control of the lighting fixture is changed depending on whether or not the threshold level is exceeded. For example, if the luminous intensity exceeds the threshold level, it is excluded from the processing system. It is configured to prevent malfunction.

  However, in the above apparatus, even if the light appearing at and near the window position can be specified, the appearing light can be determined only by setting up / down with respect to a specific threshold level. When it appears in the image of the camera below the threshold level, it cannot be denied that it is determined that the person is a person and the lighting fixture is erroneously turned on. Specifically, originally, the lighting fixture L should be turned on only when a person (luminance block M) is present in the room, but by turning on the switch of the TV placed near the wall, A change in brightness may occur, resulting in a malfunction of the light source L. In addition, the luminance may change due to a change in luminance due to reflections on the floor surface caused by lighting of a lighting device such as a downlight, or the curtain may be shaken by the wind.

  Furthermore, Patent Document 2 discloses a system that determines a person's position and who the person is and automatically adjusts a service (light, sound, etc.) corresponding to the person within the local environment.

Special Publication 2004-501496 Special Table 2005-529548

  However, in the above system, as in the case of Patent Document 1, even if the position of the window or the position of the person can be specified by the camera, it is assumed that the person other than the person is in response to the luminance change caused by things other than the person. Since it cannot be determined, for example, the brightness change caused by turning on a TV or the like, the brightness change caused by the reflection on the floor caused by lighting of a lighting device such as a downlight, or the brightness change caused by shaking the curtain / blind When it appears in the image, it cannot be denied that it is determined that the person is a person and the lighting apparatus is erroneously turned on.

As described above, in any of the illumination systems of Patent Documents 1 and 2, even if the presence or position of a person can be specified by the camera, it cannot be determined that the person is other than a person with respect to the movement of something other than the person. The problem of mislighting the instrument remained.
The present invention has been made in view of the above circumstances, and when detecting a human using an image sensor and controlling a lighting fixture group, it reduces false detection of moving objects other than humans, and is reliable. An object of the present invention is to provide a lighting system capable of performing high lighting control.
In addition, the present invention provides an illumination system that reduces misdetection due to the movement of a curtain / blind, on / off of other lighting fixtures, on / off of a display such as a television, as a moving object other than a human being. Objective.

Therefore, the automatic lighting control type illumination system of the present invention is based on an image sensor that detects an image, a calculation unit that calculates human position data based on a detection result of the image sensor, and a calculation result of the calculation unit, An automatic lighting control type illumination system having a control unit that controls lighting of the light source, and a first storage unit that stores the detection result of the image sensor as standard data, and a person as the standard flow line data. A second storage unit that preliminarily stores the determined locus of the lump of luminance, and flow line data obtained from a comparison between the detection result of the image sensor and the standard data is the second storage unit; When the calculation unit determines that the data is the same as the standard flow line data stored in the control unit, the control unit controls the lighting of the light source based on the calculation result of the calculation unit.
With this configuration, when it is determined that the flow line data obtained from the comparison between the detection result of the image sensor and the standard data is the same as the standard flow line data stored in the second storage unit, the person is a human. Since the light source is controlled to be turned on, it is possible to prevent malfunctions caused by data other than human flow line data, such as fluctuations of a curtain or the like. In addition, the lighting device can be prevented from being turned on erroneously, so as not to cause discomfort to the person, and it is not necessary to consume useless power.

According to the present invention, in the automatic lighting control type lighting system, the second storage unit is configured to detect a current position of a lump of luminance determined from the detection result of the image sensor that the calculation unit is a person, In which the movement trajectory is stored as the standard flow line data.
According to this configuration, new data is always included as standard flow line data, and movement from that position is detected, so that misperception is greatly reduced and high-precision determination is possible.

Further, the present invention provides the automatic lighting control type lighting system, wherein the calculation unit determines whether the flow line data is within a predetermined range centering on the standard flow line data. Includes what determines whether the line data is the same.
According to this configuration, by determining the predicted movement range in advance, it is possible to make a determination with higher accuracy as necessary.

Further, the present invention provides the automatic lighting control type illumination system, wherein the second storage unit includes a current position of a mass of luminance determined by the calculation unit as a person based on a detection result of the image sensor, and the immediately preceding position. And storing the predicted movement range calculated from the movement of the luminance block together with the standard flow line data.
According to this configuration, the predicted movement range is determined based on the immediately preceding traveling direction and the magnitude of the movement, and when the immediately preceding movement is fast, the predicted moving range has a shape that greatly extends forward in the straight traveling direction. On the other hand, when the immediately preceding movement is slow, the predicted movement range is a shape close to a circle centered on the present.

According to the present invention, in the automatic lighting control type lighting system, the second storage unit is configured to detect a current position of a lump of luminance determined from the detection result of the image sensor that the calculation unit is a person, And storing the predicted movement range calculated from the movement locus of the luminance block together with the standard flow line data.
According to this configuration, the predicted movement range is determined from the accumulation of flow lines so far, and an area in which a mass of luminance recognized as a person from the accumulation of flow lines so far passes around the current position. Is preferentially set as the predicted movement range.

Further, the present invention provides the above-described automatic lighting control type lighting system, including a trigger signal generator provided at the entrance of the space, and when the trigger signal generator generates a trigger signal, the detection result of the image sensor Including the flow line data obtained from the comparison with the standard data as the standard flow line data.
According to this configuration, the standard flow line data can be automatically generated when passing through the doorway, so that automatic setting is possible.

In the automatic lighting control type illumination system, the present invention includes a voice receiving unit and a voice recognition unit, and the control unit is configured to recognize the voice recognition unit as a predetermined voice signal. Includes a lighting control of the light source in response to a calculation result of the calculation unit.
According to this configuration, since the lighting control is started only when a predetermined audio signal is received, this can be detected in a case other than the standard flow line, and correction is performed. It can be carried out.

As described above, according to the present invention, the flow line data obtained from the comparison between the detection result of the image sensor and the standard data is the same as the standard flow line data stored in the second storage unit. If it is determined, it is determined that the user is a human being, and the light source is controlled to turn on the light source, thereby preventing malfunction caused by data other than human flow line data, such as fluctuation of a curtain or the like. be able to.
Therefore, the movement of curtains / blinds other than humans, in particular, is not erroneously detected as humans, and the luminaire does not automatically respond to lighting / dimming to changes in brightness caused by movements of the curtains / blinds, etc. So people don't have to be uncomfortable.
In addition, unnecessary lighting is eliminated and energy is saved without consuming unnecessary power. In addition, by adding an alarm function, it can be used for detection of intrusion through a window, so that it is possible to enhance the crime prevention effect at night after going to bed or during absence.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is an explanatory diagram showing the indoor situation using the automatic lighting control type lighting system according to the first embodiment of the present invention, and FIG. 2 is a block diagram of this lighting system. As shown in FIG. 1, the lighting system has a luminance block that moves on a continuous image based on image information obtained by imaging using an image sensor (not shown) attached to a ceiling or the like. When the calculation unit determines that the detection result of the image sensor is the same as the preset standard flow line data so that the lighting control can be performed based only on the human information, the light source is controlled to be turned on. It is characterized by doing so.

  That is, the illumination system of the present invention includes a light source (lighting fixture) L, an image sensor 100 for detecting an image, and human position data based on the detection result of the image sensor 100, as shown in a block diagram in FIG. Is an automatic lighting control type illumination system having a calculation unit 200 for calculating the light source L and a control unit 300 for controlling the lighting of the light source L based on the calculation result of the calculation unit 200. A first storage unit 400 that stores as standard data; and a second storage unit 500 that stores in advance a locus of a luminance block that is determined to be a person as standard flow line data. When the calculation unit determines that the flow line data obtained from the comparison between the detection result and the standard data is the same as the standard flow line data stored in the second storage unit, the control unit , Serial characterized by lighting control the light source based on the calculation result of the arithmetic unit.

With this configuration, when it is determined that the flow line data obtained from the comparison between the detection result of the image sensor and the standard data is the same as the standard flow line data stored in the second storage unit, the person is a human. Since the light source is controlled to be turned on, it is possible to prevent malfunctions caused by data other than human flow line data, such as fluctuations of a curtain or the like. In addition, the lighting device can be prevented from being turned on erroneously, so as not to cause discomfort to the person, and it is not necessary to consume useless power.
Thereby, lighting control of the light source can be performed based only on the human information that is a luminance block moving on the continuous image, and the luminance change due to the on / off of the TV T and the luminance change due to the movement of the curtain near the window are caused by the movement of the person We try not to misrecognize this as a change in brightness.

  Here, the control content accompanying the luminance change includes a first storage unit 400 and a second storage unit 500 that are stored in advance as control information, and the output of the image sensor 100, the first and Based on the outputs of the second storage units 400 and 500, the calculation unit 200 calculates them, and the control unit 300 outputs and drives the lighting fixture L.

  Then, the control content for blinking / dimming the lighting fixture is selected according to the image information related to the person such as the position information and the number information of the person output from the image sensor, and the control signal is output to the control unit. Thus, the lighting fixture is controlled. Since the control unit cancels the image information other than the specific area, it is possible to prevent malfunction caused by the brightness change of the window surface due to the external light or the brightness change due to the projection of the external light from the window onto the floor surface.

  Next, the image sensor 100 is a camera using a solid-state imaging device such as a CCD image sensor or a CMOS image sensor, and a wide-angle lens, a fish-eye lens, or the like is used as a lens. The image sensor 100 outputs image information captured at predetermined time intervals. An analog signal of an image output from the image sensor 100 is converted into a digital signal by A / D conversion in the control unit 300. However, when a CMOS image sensor having a function of outputting a digital signal is used, A / D conversion in the control unit 300 is not necessary. As an image captured by the image sensor, a color image can be used, but in this embodiment, a monochrome grayscale image is used. The time interval captured by the image sensor may be set as appropriate within a range in which the presence or absence of a moving object can be determined from time-series images obtained at the time interval.

  In addition, the image sensor 100 is often installed on the ceiling so that an indoor control area can be seen from above, but the image sensor 100 is not limited to this as long as it can achieve detection targeted by the present invention. It may be installed on the wall or floor. In addition to being installed alone, it may be integrated with the lighting fixture as a unit of the lighting fixture. Here, for example, it is installed alone on the ceiling near the center of the room. The control area that the image sensor should capture in the image can be arbitrarily set in advance by the user. Further, a specific area such as the vicinity of the door is set in the control area.

  The control unit stores in advance control contents for blinking and dimming the lighting apparatus according to a pattern such as a person's occupancy position and the number of people. Further, even when a moving luminance mass M is generated by the procedure described later, according to the comparison result between the detection result of the image sensor and the data in the first and second storage units by the calculation unit, Only when it is determined that the person is not a person, the lighting control is canceled, and the flow line data is determined to be within the predicted movement range predicted from the standard flow line data, the lighting control is executed.

Next, the illumination control operation using the illumination system of the present embodiment will be described in detail.
FIG. 3 is a flowchart showing the control operation.
First, as shown in FIG. 4A, the image sensor 100 always takes a bird's-eye view image of a predetermined area in a room without a person, and generates image information (step S1001). The generated image information is stored as standard data in the first storage unit 400 (step S1002).

Further, as shown in FIG. 4B, the above-described overhead view image when a person is present is taken in advance, and the locus of the luminance block determined to be a person is stored as the second traffic line as standard flow line data. Stored in advance in unit 500 (step S1003). Here r ₀ represents the heretofore locus of movement of the mass of brightness that are currently recognized, r _t represents the current location information, the standard image stored in the first storage unit (standard data) It is the information regarding the lump of the brightness | luminance detected from comparison.

Further, as shown in FIG. 4 (c), the calculation unit is configured so that the second storage unit determines the current position of the mass of luminance determined from the detection result of the image sensor that the calculation unit is a person, and so far. From the movement trajectory, the predicted movement direction is determined as a predicted movement range r _{p so} as to spread in the substantially traveling direction according to the direction and speed of the immediately preceding movement (step S1004).

The predicted moving range r _p is a prediction range of movement of the larger shape extending in the traveling direction D _p ahead of the straight line in the case just before the movement is fast (Figure 5 (a)). On the other hand, when the previous movement is small, a predicted movement range having a shape close to a circle centered on the current position is obtained (FIG. 5B).

  Then, a bird's-eye view image at time t + n is taken by the image sensor (FIG. 6A), and flow line data obtained by comparing the obtained detection result of the image sensor with the standard data stored in the first storage unit 400. Is calculated (step S1005).

Then, the calculation unit compares the standard flow line data and the predicted movement range stored in the second storage unit with the flow line data (step S1006), and determines whether the movement is a human movement (step S1006). S1007). When the calculation unit determines that it is within the predicted movement range, it is determined that the movement is a human movement, and the luminance change that has occurred within the predicted movement range is followed as shown in FIG. A lighting control signal determined in advance according to the position and movement is transmitted to the control unit (step S1008), and the lighting fixture is blinked and dimmed (step S1009). At this time, the locus of movement is also stored.
On the other hand, if it is determined in step S1006 that it is not within the predicted movement range, it is determined that it is not a human movement, as shown in FIG. The appliance L is not controlled (step S1012).

  If it is determined that a certain luminance block is a person, the locus is tracked and stored in the second storage unit (step S1010), and the position and orientation at that time are determined (step S1011). If the image sensor stops in the control area without exiting the area to be captured in the image in this determination step S1010, it is determined that “in-room / stopped” (step S1012), and the position is also stored. Stored in the department.

  For example, in a room such as a living / dining room, a lighting load of a lighting fixture that illuminates the inside of the living / dining room can be considered, but the present invention is not limited to this application. In this type of application, when lighting equipment is turned on at the time of entering a room, it is required to keep the lighting equipment turned on as long as there are people in the room. There may be no need. In addition, it is required to turn off the luminaire in a relatively short time after leaving the room.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
FIG. 8 is an explanatory diagram showing a method of determining a predicted movement range in the lighting system according to Embodiment 2 of the present invention. In the first embodiment, the method of determining the predicted movement range from the motion of the immediately preceding person (luminance block) has been described. However, in the present embodiment, the flow line of the luminance block at present at rt _{+ n} so far Data is accumulated, and based on the accumulated data, an area r _f where a luminance block recognized as a person passes frequently is preferentially set as the predicted movement range r _p . Others are the same as those in the first embodiment, and the description is omitted here.

In the present embodiment, based on the predicted moving range r _p, because you have to confirm whether a person, or lights to be absent, despite the occupancy, not lit Can be controlled so as not to become uncomfortable.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.
In the above embodiment, image information when a person appears is stored in advance, but in this embodiment, as shown in FIG. 9, when a person M first appears, that is, when entering a room, A trigger signal for recognizing the occurrence of the signal is generated, and based on this trigger signal, the brightness change is followed thereafter.

In the present embodiment, as shown in FIG. 10, a human sensor 600 composed of a pyroelectric sensor is installed near the entrance of the room, and when the human sensor 600 detects a person entering the room, Using this detection signal as a trigger signal, storage of image information is started.
That is, first, the flow line data obtained from the comparison between the detection result of the image sensor and the standard data is set as the standard flow line data.

According to the present embodiment, since it is only necessary to start storing image information when there is an output signal from the human sensor 600, it is efficient without requiring unnecessary data accumulation or calculation processing. Arithmetic processing is possible.
In the above-described embodiment, the entrance of a person is detected by a pyroelectric sensor. However, as shown in FIG. 11, a tag capable of transmitting an RF (high frequency) ID or an ID signal such as a mobile phone is prepared. The ID signal emitted from the tag may be detected by the signal receiving unit 600R attached to the ceiling or the like, and the output of the signal receiving unit 600R may be used as a trigger signal to follow the change in luminance thereafter.
According to this method, it is possible to perform lighting control corresponding to an individual by providing the tag with an identifier in advance.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described.
In the above embodiment, image information when a person appears is stored in advance, but in this embodiment, as shown in FIG. The voice may be detected by the voice recognition unit 600A, and a trigger signal for starting control may be generated based on the detection result.
For example, when a person does not enter the entrance door D provided with the human sensor 600 and enters the entrance window W, a trigger for starting control is generated by emitting a predetermined sound such as “lit”. A signal is generated.
In this case, the step of determining whether or not the person is based on the image information as in the first embodiment is not necessary. When the voice recognition unit 600A issues a trigger signal, the control unit The lighting and dimming control is performed while detecting the position of the person based on the output of the image sensor.

  In the present embodiment, not only at the entrance (door) but also when a person enters the room through the sweep window, the control content for switching the switch circuit from OFF to ON is selected as in the case of entry from the entrance. In spite of being in the room, it can be controlled so that it does not become uncomfortable without lighting.

  In this way, the control content for blinking / dimming the lighting fixture is selected in accordance with the image information related to the person such as the position information and the number information of the person output from the image sensor 100, and the control is performed to the control unit. A signal is output to control the luminaire. In order to cancel image information other than people by the calculation unit and the control unit, the TV is turned on, other lighting is reflected on the floor, the brightness of the window changes due to external light, and the outside light from the window to the floor It is possible to prevent malfunctions caused by brightness changes due to the projection of the screen and the fluctuation of the curtain due to the wind.

In the first to fourth embodiments, when the luminance change does not move within a predetermined time in the process of tracking the luminance mass (luminance change) that causes the luminance change, the luminance change is canceled. You may do it.
As a result, in the process of tracking the luminance change, if the luminance change does not move within a predetermined time, this luminance change is canceled, so that it is possible to discriminate between the person entering and exiting the sweep window and the curtain fluctuation. And false detection can be further suppressed. In addition, by providing a time limit, control is once started, but it is also possible to cancel the control when the luminance change does not move within a predetermined time.

  In addition, this invention is not limited to the structure of the said embodiment, It can utilize also as a suspicious person detection apparatus in the system which monitors whether there is a suspicious person's invasion in a room | chamber interior. For example, by switching from normal control to security mode, when a suspicious person enters the room through a window after going to bed at night or while you are away, the lighting equipment lights up, an alarm sound sounds, Actions such as reporting to residents can be generated.

Explanatory drawing which shows the illumination system of Embodiment 1 of this invention. The block diagram which shows the illumination system of Embodiment 1 of this invention The flowchart figure which shows the control action of the illumination system of Embodiment 1 of this invention. Explanatory drawing which shows the illumination system of Embodiment 1 of this invention. Explanatory drawing which shows the illumination system of Embodiment 1 of this invention. Explanatory drawing which shows the illumination system of Embodiment 1 of this invention. Explanatory drawing which shows the illumination system of Embodiment 1 of this invention. Explanatory drawing which shows the illumination system of Embodiment 2 of this invention. Explanatory drawing which shows the concept of the illumination system of Embodiment 3 of this invention. Explanatory drawing which shows the illumination system of Embodiment 3 of this invention. Explanatory drawing which shows the modification of the illumination system of Embodiment 3 of this invention. Explanatory drawing which shows the modification of the illumination system of Embodiment 4 of this invention. Explanatory drawing which shows a person's position detection method

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Image sensor 200 Calculation part 300 Control part 400 1st memory | storage part 500 2nd memory | storage part L Lighting fixture 600 Human sensor

Claims (7)

A light source;
An image sensor for detecting an image;
A calculation unit for calculating human position data based on the detection result of the image sensor;
Based on the calculation result of the arithmetic unit, a control unit that controls lighting of the light source, and an automatic lighting control type lighting system,
A first storage unit that stores detection results of the image sensor as standard data;
As standard flow line data, it has a second storage unit that stores in advance a locus of a block of luminance determined to be a person,
When the operation unit determines that the flow line data obtained from the comparison between the detection result of the image sensor and the standard data is the same as the standard flow line data stored in the second storage unit,
The said control part judges that the said lump of brightness | luminance is a person, The automatic lighting control type illumination system which carries out lighting control of the said light source based on the calculation result of the said calculating part. The automatic lighting control type lighting system according to claim 1,
The second storage unit stores, as the standard flow line data, the current position of the luminance block determined from the detection result of the image sensor that the calculation unit is a person and the trajectory of the movement so far. Automatic lighting control lighting system. The automatic lighting control type lighting system according to claim 1 or 2,
The calculation unit determines whether the flow line data is the same as the standard flow line data by determining whether the flow line data is within a predetermined range centered on the standard flow line data. Lighting system. The automatic lighting control type lighting system according to any one of claims 1 to 3,
The second storage unit has a predicted movement range calculated from the current position of the luminance chunk determined by the calculation unit as a person from the detection result of the image sensor and the movement of the previous luminance chunk. An automatic lighting control type illumination system that stores the standard flow line data together. The automatic lighting control type lighting system according to any one of claims 1 to 3,
The second storage unit is a prediction calculated from the current position of the luminance chunk determined from the detection result of the image sensor that the calculation unit is a person, and the movement locus of the luminance chunk so far An automatic lighting control lighting system that stores a moving range together with the standard flow line data. An automatic lighting control type lighting system according to any one of claims 1 to 5,
A trigger signal generator provided at an entrance of the space, and when the trigger signal generator generates a trigger signal, flow line data obtained from a comparison between the detection result of the image sensor and the standard data; Automatic lighting control lighting system that is set as standard flow line data. The automatic lighting control type lighting system according to any one of claims 1 to 6,
When the voice recognition unit recognizes that the voice recognition unit is a predetermined voice signal, the control unit turns on the light source in response to the calculation result of the calculation unit. Automatic lighting control lighting system to control.

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