JP2012034228A - Image monitoring system, power supply controller, and power supply control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image monitoring system, a power supply controller, and a power supply control program which are capable of reducing power consumption as the whole system.SOLUTION: The image monitoring system of this embodiment comprises: an photographing unit which photographs an object to be photographed and operates using power; an extraction unit for extracting a black portion of the image obtained by the photographing unit; a determination unit which calculates the ratio of the black portion in the image from the extracted black portion and determines whether the ratio is not less than a threshold; and a power supply unit which disconnects power supply to the photographing unit when the determination unit determined that the ratio is not less than the threshold.

Description

  Embodiments described herein relate generally to an image monitoring system, a power supply control device, and a power supply control program.

  In recent years, surveillance cameras for monitoring riverbeds and mountainous areas have been developed. Even when using a highly sensitive surveillance camera at night, there is not enough illuminance on the image of the monitored object, so only a black image is displayed on the monitor. It cannot be monitored with the naked eye.

JP 2000-184362 A

  Even in a situation where such monitoring is not possible, power is continuously supplied to the devices constituting the image monitoring system, and power consumption continues and waste occurs.

  In view of the above circumstances, an image monitoring system, a power supply control device, and a power supply control program that can reduce the power consumed by the entire system are provided.

In order to achieve the above object, the image monitoring system of the present embodiment
An imaging unit that shoots the subject and operates using power;
An extraction unit for extracting a black portion of the image acquired by the imaging unit;
From the extracted black part, a ratio of the black part in the image is calculated, and a determination unit that determines whether the ratio is equal to or greater than a threshold value;
When the determination unit determines that it is equal to or greater than the threshold, a power supply unit that cuts off power supply to the imaging unit;
It is characterized by having.

In addition, the power supply control device of this embodiment is
An analysis unit that calculates a ratio of a black portion of a decoded image captured by the imaging unit;
A determination unit for determining whether the ratio of the black portion is equal to or greater than a threshold;
And a signal transmission unit for sending an instruction to cut off the power supply of the imaging unit to the imaging unit when the determination unit determines that the threshold is equal to or greater than the threshold value.

In addition, the power control program of this embodiment is
A decoding process for decoding an image sent from a shooting unit that takes an image of a shooting target and operates with power;
An analysis process for calculating a ratio of a black portion of the image decoded by the decoding unit;
A determination process for determining whether the ratio of the black portion is equal to or greater than a threshold;
When the determination unit determines that the value is equal to or greater than the threshold value, a signal transmission process for sending an instruction to cut off power supply of the imaging unit to the imaging unit is operated on the power supply control device. .

1 is a block diagram showing a configuration of an image monitoring system including a power supply control device according to a first embodiment. The block diagram which shows the structure of the power supply control apparatus which concerns on 1st Embodiment. 6 is a flowchart showing the operation of the image monitoring system according to the first embodiment. The block diagram which shows the modification concerning 1st Embodiment. 9 is a flowchart showing a modification of the operation according to the first embodiment. The block diagram which shows the structure of the power supply control apparatus which concerns on 2nd Embodiment. 6 is a flowchart showing the operation of the image monitoring system according to the second embodiment. 10 is a flowchart showing the operation of the image monitoring system according to the third embodiment. The block diagram which shows the structure of the power supply control apparatus which concerns on 4th Embodiment. 10 is a flowchart showing the operation of the image monitoring system according to the fourth embodiment. The block diagram which shows the structure of the power supply control apparatus which concerns on 5th Embodiment. 10 is a flowchart showing the operation of the image monitoring system according to the fifth embodiment.

  Each embodiment will be described below with reference to FIGS.

(First embodiment)
A first embodiment will be described with reference to FIGS. 1 to 5.

  As shown in FIG. 1, the image monitoring system according to the present embodiment includes a camera unit 10, a machine-side control device 20, a CCTV control device 30, a monitor unit 40, and a communication network 100.

  The camera unit 10 is a device that images a subject. A digital camera or an analog camera. For example, a PTZ camera (integrated pan / tilt / zoom lens) can be used to perform pan / tilt / zoom. As shown in FIG. 1, the camera unit 10 may be composed of a plurality of camera units 10. Control of zooming and turning of the camera unit is performed by the management server 33 via the camera control unit 21 in the machine-side control device 20. The image captured by the camera unit 10 is sent to each unit in the machine-side control unit 20.

  The machine-side control device 20 includes a camera control unit 21, a character synthesis unit 22, an image encoding unit 23, a transmission unit 24, and a power supply unit 25.

  When receiving a control signal for the camera unit 10 from the management server 33, the camera control unit 21 instructs the camera unit 10 to zoom or turn.

  The character synthesis unit 22 is a synthesis unit that synthesizes character data with image data captured by the camera unit 10. As a combining method, for example, a part of image data (pixel data) is deleted from the image data of one screen, and the character data from the character information control unit 53 is displayed on the deleted pixels. . In this way, character data can be synthesized on the captured image data.

  As another method, the image data and the character data are arranged on the same pixel without deleting the image data on the screen, and the transparency of each image is adjusted to adjust the transparency of the image data. It is also possible to synthesize character data. For example, the synthesized image data is created by setting the transparency of the image data to 50% and the transparency of the character data to 50%. In addition to these methods, a synthesis technique for synthesizing characters with images in normal analog broadcasting and digital broadcasting can be substituted. Although the character synthesizer 22 is used in the present embodiment, the character synthesizer 22 is merely an additional function and may not be provided as a system.

  The image encoding unit 23 is an encoder that encodes image information from the camera unit 10 by sampling and quantization. The encoded image data is sent to the transmission unit 24.

  The transmission unit 24 is connected to the communication network 100 and transmits the image data encoded by the image encoding unit 23 to the CCTV control unit 30. For example, a router.

  The power supply unit 25 supplies power to the camera unit 10 and the machine-side control unit 24. Electric power may be supplied from a commercial system, or various power sources such as batteries can be used. The disconnection and connection of these power supplies are controlled using a relay, for example. Processing for cutting off the power supply to the camera unit 10, the camera control unit 21, the character synthesis unit 22, and the image encoding unit 23 when a signal for cutting off the power supply is received from a signal transmission unit 65 in the power supply control device 60 described later. I do.

  The CCTV control device 30 centrally controls and monitors a plurality of camera units 10 via the machine-side control device 20. The CCTV control device 30 includes a transmission unit 31, an image decoding unit 32, a management server 33, and a power supply control device 60.

  The transmission unit 31 is connected to the transmission unit 24 via the communication network 100 and receives the image data encoded by the image encoding unit 23. The received data is sent to the image decoding unit 32.

  The image decoding unit 32 decodes the image data received by the transmission unit 31. This is a so-called decoder that performs various decoding processes.

  The management server 33 manages the image monitoring system. It has an arithmetic processing function for management, etc., and detects a failure of the photographing unit 30 and performs other processes necessary for system operation.

  As shown in FIG. 2, the power supply control unit 60 includes an image decoding unit 61, an image analysis unit 62, an event determination unit 63, a data storage unit 64, and a signal transmission unit 65.

  The image decoding unit 61 performs the same decoding of image data as the image decoding unit 32. Therefore, in this embodiment, the image decoding unit 61 and the image decoding unit 32 are described as separate units, but the same unit may be shared.

  The image analysis unit 62 extracts the black portion of the image from the analog image data decoded by the image decoding unit 61. For example, the image analysis method can be performed by creating image data in a format that can be used by the image analysis unit 62 from an image captured by the camera unit 10. The image data at this time is displayed on the monitor unit 40, for example, and is composed of about 16,670,000 colors of combinations of the three primary colors “red R, green G, blue B” in which one pixel has a luminance of 0-255. Yes.

  Since it is not necessary to use all these combinations, they are used in a limited manner. For example, when 00 to FF expressing these colors in hexadecimal are divided equally while increasing by 33, six numerical values of 00, 33, 67, 99, CC, and FF are obtained. When black is represented, red R is “00”, green G is “00”, and blue B is “00”. Conversely, when representing pure white, red R is “FF”, green G is “FF”, and blue B is “FF”. The dark gray color is represented by red R as “33”, green G as “33”, and blue B as “33”. In light gray, red R is “CC”, green G is “CC”, and blue B is “CC”. Thus, since three colors are combined using six numerical values for each color, a combination chart of three primary colors of 6 × 6 × 6 = 216 colors can be created and used.

  The image analysis unit 62 can represent each pixel as hexadecimal image data by comparing the color of these combination charts with each pixel of the image. The number of pixels that can be determined to be black is extracted from the image data. For example, if each pixel has a value lower than “11” for red R, “11” for green G, and “11” for blue B, it may be possible to set a condition for determining that the pixel is black. . These values may be stored in the data storage unit 64.

  It should be noted that the present invention is not limited to the hexadecimal system, and a so-called N-ary system such as a binary system can also be used, and it is not necessary to limit the use to 216 colors.

  It is also conceivable to create image data using “hue H, saturation S, brightness V” instead of “red R, green G, blue B”. Hue H (Hue) is represented by a value of 0 to 360 °, red is 0 ° (360 °), yellow is 60 °, green is 120 °, light blue is 180 °, blue is 240 °, purple is 300 °. Represented as: Saturation S (Saturation) is represented by a value from 0 to 1. When S = 0, the achromatic color, that is, the lightest color, and as it approaches 1, the saturation becomes higher, that is, darker, and S = 1 has the maximum saturation. The lightness V is indicated by a value of 0 to 1, with V = 0 being black, that is, darkest, and becoming brighter as it approaches 1, and V = 1 representing white, that is, the brightest state.

  Similar to “red R, green G, blue B”, “hue H, saturation S, brightness V” is determined for each pixel of the photographed image, and the saturation H is not less than a certain value. When V = 0.2 to V = 0.0, it is determined that the pixel is black. Thus, the black part in the image can be calculated by dividing the number of pixels determined to be black by the number of pixels in the entire image.

  In addition, not only the calculation method using the luminance value and the color value but also the luminance, color distribution, edge amount, texture, and the like may be used for black calculation.

  The event determination unit 63 calculates the ratio of the black portion extracted by the image analysis unit 62 to the entire image. Specifically, it is determined how many black pixels are included in one frame. This can be calculated by dividing the total number of pixels of the photographed image by the black portion.

That is, (ratio of black part) = (number of black pixels) / (number of pixels of image data)
Can be calculated as

  In this way, the ratio of black pixels in the image data can be calculated. The ratio is compared with the threshold value stored in the data storage unit 64. If the ratio of black in the image (each image frame) is larger than the threshold value, a signal for cutting off the power to be monitored is transmitted to the transmission unit 31 and the transmission unit. 24, the power supply unit 25 transmits power to the power supply unit 25 to disconnect the power.

  The data storage unit 64 stores a threshold value used for determining whether the black ratio is equal to or higher than a certain level. The data storage unit 64 further stores failure information of the camera unit 10. In addition, it is a medium for storing various data, and various storage media such as generally used disk devices, optical disk devices, and semiconductor memories can be used. These storage media may be used for temporary storage.

  The signal transmission unit 65 has the same function as the transmission unit 24 and the transmission unit 31. Therefore, you may utilize the signal transmission part 65 and the transmission part 31 as the same thing.

  The monitor unit 40 is a display screen that displays an image sent from the camera unit 10. In the present embodiment, the medium is described as a medium to be displayed by an image or the like, but other output functions, for example, an audio output unit that outputs audio may be used.

  The input unit 41 is an interface for inputting various information. For example, a PC input keyboard. A command is input to the management server unit 33 by the input from the input unit 41. In addition, the threshold setting of the data storage unit 64 is changed. For example, in the above black determination, when red R is “11”, green G is “11”, and blue B is lower than “11”, a condition for determining that the color is black is set. For example, it is used for an operation of changing the red R to “11”, the green G to “11”, and the blue B to “1F” on ten camera units.

  The communication network 100 is composed of lines that can communicate with each other. For example, a wired communication network such as a LAN or an intranet is used, but it can be replaced with a wireless communication network.

  Next, the operation in the first embodiment will be described.

  The camera unit 10 images a subject such as a river. When it is desired to magnify these subjects or to capture other angles, control such as zooming and turning of the camera unit is performed by the management server 33 via the camera control unit 21 in the machine-side control device 20. The image captured by the camera unit 10 is sent to each unit in the machine-side control unit 20 (step S101).

  The image encoding unit 23 that receives an image from the camera unit 10 or an image in which characters are combined by the character combining unit 22 is an encoder that encodes image information by sampling and quantization. The encoded image data is sent to the transmission unit 24 (step S102).

  The transmission unit 24 is connected by the communication network 100, and transmits the image data encoded by the image encoding unit 23 to the CCTV control unit 30 (step S103).

  The transmission unit 31 that has received the image data encoded by the image encoding unit 23 via the network 100 sends the received data to the image decoding unit 32 and the image decoding unit 61.

  The image decoding unit 32 decodes the image data received by the transmission unit 31, transmits the image data to the monitor 40, and displays it on the screen (steps S 201 and 202).

  The image decoding unit 61 decodes the image data received by the transmission unit 31 and sends it to the image analysis unit 62 (step S301).

  The image analysis unit 62 extracts the black portion of the image from the analog image data decoded by the image decoding unit 61. For example, the image analysis method can be performed by creating image data in a format that can be used by the image analysis unit 62 from an image captured by the camera unit 10. From the combination of the three primary colors of “Red R, Green G, Blue B”, for example, each pixel has a hexadecimal value of “R” from “33”, Green G from “33”, and Blue B from “33”. If the value is low, it may be possible to set a condition for determining that the color is black. These values may be stored in the data storage unit 64.

  It is also conceivable to create image data using “hue H, saturation S, brightness V” instead of “red R, green G, blue B”. Similar to “red R, green G, blue B”, “hue H, saturation S, brightness V” is determined for each pixel of the photographed image, and the saturation H is not less than a certain value. When V = 0.2 to V = 0.0, it is determined that the pixel is black.

  Note that for black calculation, not only the calculation method using the luminance value and the color value but also the luminance, color distribution, edge amount, texture, and the like may be used (step S302).

  The event determination unit 63 calculates the ratio of the black portion extracted by the image analysis unit 62 to the entire image. Specifically, it is determined how many black pixels are included in one frame. This can be calculated by dividing the total number of pixels of the photographed image by the black portion.

That is, (ratio of black) = (number of black pixels) / (number of pixels of image data)
Can be calculated as

  In this way, the ratio of black pixels in the image data is calculated (step S303).

  This ratio is compared with the threshold value stored in the data storage unit 64 to determine whether or not the black ratio in the image (each image frame) is larger than the threshold value. In the determination, a threshold value used for determining whether or not the black ratio stored in the data storage unit 64 is equal to or greater than a certain value is used to determine whether the ratio is equal to or greater than the threshold value. (Step S304).

  The event determination unit 63, when the ratio of the black part is determined to be equal to or greater than the threshold in the determination in step S304 via the signal transmission unit 65, the power supply unit 25 of the camera unit 10 that is determined to have the ratio of the black part equal to or greater than the threshold. An instruction to cut off the power supply to each predetermined part is transmitted to (step S305).

  The power supply unit 25 that has received the interruption of the power supply performs a process of cutting off the power supply to the camera unit 10, the camera control unit 21, the character synthesis unit 22, and the image encoding unit 23 (step S104).

  In this embodiment, the power supply control device 60 is provided in the CCTV control device 30. However, as shown in FIG. 4, a program for exercising the function of the power supply control device 60 may be provided in the management server 33. . In this case, as shown in FIG. 5, the image decoding unit 32 and the image decoding unit 61, and the transmission unit 31 and the signal transmission unit 65 are made identical.

  In this way, when monitoring rivers, sabo, etc. with no light at night, the captured image or image is analyzed, and the black part of the imaging range, that is, the part that does not serve as a captured image When the value exceeds an arbitrary threshold value, the power of some devices constituting the system is forcibly cut off. Thereby, the electric power consumed as the whole system can be reduced.

(Second Embodiment)
The aspect of 2nd Embodiment is demonstrated referring FIG. 6, FIG.

  The difference from the first embodiment is that the power supply control device 60 mainly includes a primary determination unit 66. Further, the data storage unit 64 holds the daily sunrise and sunset times.

  The primary determination unit 66 determines the case after the sunset time and before the sunrise time based on the sunset time and sunrise time according to the calendar held in the data storage unit 64.

  The operation of the second embodiment will be described with reference to FIG.

  The camera unit 10 images a subject such as a river. When it is desired to magnify these subjects or to capture other angles, control such as zooming and turning of the camera unit is performed by the management server 33 via the camera control unit 21 in the machine-side control device 20. The image captured by the camera unit 10 is sent to each unit in the machine-side control unit 20 (step S401).

  The image encoding unit 23 that receives an image from the camera unit 10 or an image in which characters are combined by the character combining unit 22 is an encoder that encodes image information by sampling and quantization. The encoded image data is sent to the transmission unit 24 (step S402).

  The transmission unit 24 is connected by the communication network 100, and transmits the image data encoded by the image encoding unit 23 to the CCTV control unit 30 (step S403).

  The transmission unit 31 that has received the image data encoded by the image encoding unit 23 via the network 100 sends the received data to the image decoding unit 32 and the primary determination unit 66.

  The image decoding unit 32 decodes the image data received by the transmission unit 31, and transmits the image data to the monitor 40 to be displayed on the screen (steps S501 and S502).

  The primary determination unit 66 determines whether the time when the image data is received by the transmission unit 31 is after the sunset time and before the sunrise time (step S601).

  When it is after the sunset time and before the sunrise time (step S601-Y), the image decoding unit 61 decodes the image data received by the transmission unit 31 and sends it to the image analysis unit 62 (step S602). When it is determined that the time is before the sunset time or after the sunrise time (step S601-N), the power control process is terminated.

  The image analysis unit 62 extracts the black portion of the image from the analog image data decoded by the image decoding unit 61. For example, the image analysis method can be performed by creating image data in a format that can be used by the image analysis unit 62 from an image captured by the camera unit 10. From the combination of the three primary colors of “Red R, Green G, Blue B”, for example, each pixel has a hexadecimal value of “R” from “33”, Green G from “33”, and Blue B from “33”. If the value is low, it may be possible to set a condition for determining that the color is black. These values may be stored in the data storage unit 64.

  It is also conceivable to create image data using “hue H, saturation S, brightness V” instead of “red R, green G, blue B”. Similar to “red R, green G, blue B”, “hue H, saturation S, brightness V” is determined for each pixel of the photographed image, and the saturation H is not less than a certain value. When V = 0.2 to V = 0.0, it is determined that the pixel is black.

  Note that the black calculation may use not only the calculation method using the luminance value and the color value but also the luminance, color distribution, edge amount, texture, and the like (step S603).

  The event determination unit 63 calculates the ratio of the black portion extracted by the image analysis unit 62 to the entire image. Specifically, it is determined how many black pixels are included in one frame. This can be calculated by dividing the total number of pixels of the photographed image by the black portion.

That is, (ratio of black) = (number of black pixels) / (number of pixels of image data)
Can be calculated as

  In this way, the ratio of black pixels in the image data is calculated (step S604).

  This ratio is compared with the threshold value stored in the data storage unit 64 to determine whether or not the black ratio in the image (each image frame) is larger than the threshold value. In the determination, a threshold value used for determining whether or not the black ratio stored in the data storage unit 64 is equal to or greater than a certain value is used to determine whether the ratio is equal to or greater than the threshold value. (Step S605).

  When the black ratio is determined to be equal to or greater than the threshold in the determination in step S905 via the signal transmission unit 65, the event determination unit 63 determines that the black ratio is equal to or greater than the threshold. An instruction to cut off the power supply to each predetermined part is transmitted to (step S606).

  The power supply unit 25 that has received the interruption of the power supply performs a process of cutting off the power supply to the camera unit 10, the camera control unit 21, the character synthesis unit 22, and the image encoding unit 23 (step S404).

  In this embodiment, the power supply control device 60 is provided in the CCTV control device 30. However, as in the first embodiment, a program for demonstrating the function of the power supply control device 60 is provided in the management server 33. Also good.

  In this way, when monitoring rivers, sabo, etc. with no light at night, the captured image or image is analyzed, and the black part of the imaging range, that is, the part that does not serve as a captured image When the value exceeds an arbitrary threshold value, the power of some devices constituting the system is forcibly cut off. Thereby, the electric power consumed as the whole system can be reduced. Furthermore, the power consumed by the entire system can be further reduced by limiting the operation time of the power supply control device 60 or the power supply control function.

(Third embodiment)
The aspect of 3rd Embodiment is demonstrated.

  The main difference from the second embodiment is that the temporary determination unit 66 determines whether or not there is a failure in each camera unit 10 or the machine-side control device 20 to which an image has been sent. Correspondingly, failure information of each camera unit 10 and the machine-side control device 20 acquired by the CCTV control device 30 is stored in the data storage unit 64.

  The primary determination unit 66 compares the failure information from the devices constituting the image monitoring system with the failure information held in the data storage unit 64, so that each camera unit 10 or machine-side control device to which an image has been sent. It is determined whether or not 20 has a failure.

  The operation of the third embodiment will be described with reference to FIG.

  The camera unit 10 images a subject such as a river. When it is desired to magnify these subjects or to capture other angles, control such as zooming and turning of the camera unit is performed by the management server 33 via the camera control unit 21 in the machine-side control device 20. The image captured by the camera unit 10 is sent to each unit in the machine-side control unit 20 (step S701).

  The image encoding unit 23 that receives an image from the camera unit 10 or an image in which characters are combined by the character combining unit 22 is an encoder that encodes image information by sampling and quantization. The encoded image data is sent to the transmission unit 24 (step S702).

  The transmission unit 24 is connected by the communication network 100, and transmits the image data encoded by the image encoding unit 23 to the CCTV control unit 30 (step S703).

  The transmission unit 31 that has received the image data encoded by the image encoding unit 23 via the network 100 sends the received data to the image decoding unit 32 and the primary determination unit 66.

  The image decoding unit 32 decodes the image data received by the transmission unit 31, and transmits the image data to the monitor 40 to be displayed on the screen (steps S801 and 802).

  The primary determination unit 66 determines whether or not there is a failure in each camera unit 10 or the machine-side control device 20 to which an image has been sent by comparing with the failure information held in the data storage unit 64. (Step S901).

  When a failure is detected (step S901-Y), the image decoding unit 61 decodes the image data received by the transmission unit 31 and sends it to the image analysis unit 62 (step S902).

  The image analysis unit 62 extracts the black portion of the image from the analog image data decoded by the image decoding unit 61. For example, the image analysis method can be performed by creating image data in a format that can be used by the image analysis unit 62 from an image captured by the camera unit 10. From the combination of the three primary colors of “Red R, Green G, Blue B”, for example, each pixel has a hexadecimal value of “R” from “33”, Green G from “33”, and Blue B from “33”. If the value is low, it may be possible to set a condition for determining that the color is black. These values may be stored in the data storage unit 64.

  It is also conceivable to create image data using “hue H, saturation S, brightness V” instead of “red R, green G, blue B”. Similar to “red R, green G, blue B”, “hue H, saturation S, brightness V” is determined for each pixel of the photographed image, and the saturation H is not less than a certain value. When V = 0.2 to V = 0.0, it is determined that the pixel is black.

  Note that for black calculation, not only the calculation method using the luminance value and the color value but also luminance, color distribution, edge amount, texture, and the like may be used (step S903).

  The event determination unit 63 calculates the ratio of the black portion extracted by the image analysis unit 62 to the entire image. Specifically, it is determined how many black pixels are included in one frame. This can be calculated by dividing the total number of pixels of the photographed image by the black portion.

That is, (ratio of black) = (number of black pixels) / (number of pixels of image data)
Can be calculated as

  In this way, the ratio of black pixels in the image data is calculated (step S904).

  This ratio is compared with the threshold value stored in the data storage unit 64 to determine whether or not the black ratio in the image (each image frame) is larger than the threshold value. In the determination, a threshold value used for determining whether or not the black ratio stored in the data storage unit 64 is equal to or greater than a certain value is used to determine whether the ratio is equal to or greater than the threshold value. (Step S905).

  When the black ratio is determined to be equal to or greater than the threshold in the determination in step S905 via the signal transmission unit 65, the event determination unit 63 determines that the black ratio is equal to or greater than the threshold. An instruction to cut off the power supply to each predetermined part is transmitted to (step S906).

  The power supply unit 25 that has received the interruption of the power supply performs a process of cutting off the power supply to the camera unit 10, the camera control unit 21, the character synthesis unit 22, and the image encoding unit 23 (step S704).

  In this embodiment, the power supply control device 60 is provided in the CCTV control device 30. However, as in the first embodiment, a program for demonstrating the function of the power supply control device 60 is provided in the management server 33. Also good. In the present embodiment, the temporary determination unit 66 determines whether or not there is failure information. However, the temporary determination unit 66 determines whether or not it is after the sunset time and whether or not there is failure information. The determination on both conditions may be performed, and if it is determined that either one is applicable, the power control process may be terminated.

  In this way, when monitoring rivers, sabo, etc. with no light at night, the captured image or image is analyzed, and the black part of the imaging range, that is, the part that does not serve as a captured image When the value exceeds an arbitrary threshold value, the power of some devices constituting the system is forcibly cut off. Thereby, the electric power consumed as the whole system can be reduced. Further, by performing the primary determination based on the failure information, it is possible to reduce the power consumed by the entire system while the information related to the basis of the system such as the failure information remains in a communicable state.

(Fourth embodiment)
The aspect of 4th Embodiment is demonstrated referring FIG. 9, FIG.

  The difference from the first embodiment is mainly that the power supply control device 60 includes a failure information receiving unit 67. In addition, the event determination unit 63 determines whether or not there is failure information. If there is failure information, the power cut-off process is not performed even if the ratio of the black portion is equal to or greater than a certain value. This failure information normally uses signal exchange performed between the camera unit 10 and the CCTV control unit 30.

  The failure information receiving unit 67 receives failure information of each camera unit 10 and stores it in the data storage unit 64.

  The operation of the fourth embodiment will be described with reference to FIG.

  The camera unit 10 images a subject such as a river. When it is desired to magnify these subjects or to capture other angles, control such as zooming and turning of the camera unit is performed by the management server 33 via the camera control unit 21 in the machine-side control device 20. The image captured by the camera unit 10 is sent to each unit in the machine-side control unit 20 (step S1001).

  The image encoding unit 23 that receives an image from the camera unit 10 or an image in which characters are combined by the character combining unit 22 is an encoder that encodes image information by sampling and quantization. The encoded image data is sent to the transmission unit 24 (step S1002).

  The transmission unit 24 is connected by the communication network 100, and transmits the image data encoded by the image encoding unit 23 to the CCTV control unit 30 (step S1003).

  The transmission unit 31 that has received the image data encoded by the image encoding unit 23 via the network 100 sends the received data to the image decoding unit 32 and the primary determination unit 66.

  The image decoding unit 32 decodes the image data received by the transmission unit 31, and transmits the image data to the monitor 40 to be displayed on the screen (steps S1101 and 1102).

The image decoding unit 61 decodes the image data received by the transmission unit 31 and sends it to the image analysis unit 62 (step S1201).

  The image analysis unit 62 extracts the black portion of the image from the analog image data decoded by the image decoding unit 61. For example, the image analysis method can be performed by creating image data in a format that can be used by the image analysis unit 62 from an image captured by the camera unit 10. From the combination of the three primary colors of “Red R, Green G, Blue B”, for example, each pixel has a hexadecimal value of “R” from “33”, Green G from “33”, and Blue B from “33”. If the value is low, it may be possible to set a condition for determining that the color is black. These values may be stored in the data storage unit 64.

  It is also conceivable to create image data using “hue H, saturation S, brightness V” instead of “red R, green G, blue B”. Similar to “red R, green G, blue B”, “hue H, saturation S, brightness V” is determined for each pixel of the photographed image, and the saturation H is not less than a certain value. When V = 0.2 to V = 0.0, it is determined that the pixel is black.

  Note that for black calculation, not only the calculation method using the luminance value and the color value but also luminance, color distribution, edge amount, texture, and the like may be used (step S1202).

  The event determination unit 63 calculates the ratio of the black portion extracted by the image analysis unit 62 to the entire image. It is determined how many black pixels are included in one frame. Specifically, the ratio of the black portion can be calculated by dividing by the total number of pixels of the photographed image.

That is, (ratio of black) = (number of black pixels) / (number of pixels of image data)
Can be calculated as

  In this way, the ratio of black pixels in the image data is calculated (step S1203).

  This ratio is compared with the threshold value stored in the data storage unit 64 to determine whether or not the black ratio in the image (each image frame) is larger than the threshold value. In the determination, a threshold value used for determining whether or not the black ratio stored in the data storage unit 64 is equal to or greater than a certain value is used to determine whether the ratio is equal to or greater than the threshold value. (Step S1204).

  When the event determination unit 63 determines that the ratio of black is greater than the threshold (step S1204-Y), the camera unit 10 that has sent the further determined image compares the failure information stored in the data storage unit 64. (Step S1205). If there is information that the camera unit 10 is out of order, the process ends (step S1205-Y).

  The event determination unit 63 determines that the ratio of the black portion is determined when the ratio of the black portion is determined to be equal to or greater than the threshold value in the determination in step S304 via the signal transmission unit 65. An instruction to cut off the power supply to each predetermined unit is transmitted to the power source unit 25 of the camera unit 10 determined to be equal to or greater than the threshold (step S1206).

  The power supply unit 25 that has received the interruption of the power supply performs a process of cutting off the power supply to the camera unit 10, the camera control unit 21, the character synthesis unit 22, and the image encoding unit 23 (step S1004).

  In this embodiment, the power supply control device 60 is provided in the CCTV control device 30. However, as in the first embodiment, a program for demonstrating the function of the power supply control device 60 is provided in the management server 33. Also good. Instead of the failure determination of this embodiment, it may be determined whether it is after the sunset time and before the sunrise time based on the sunset time and sunrise time used in the second embodiment.

  In this way, when monitoring rivers, sabo, etc. with no light at night, the captured image or image is analyzed, and the black part of the imaging range, that is, the part that does not serve as a captured image When the value exceeds an arbitrary threshold value, the power of some devices constituting the system is forcibly cut off. Further, the camera unit 10 that has detected the failure is not controlled. Thereby, it is possible to reduce the power consumed by the entire system while keeping communication of information related to the basis of the system such as failure information in a communicable state.

(Fifth embodiment)
The aspect of 5th Embodiment is demonstrated referring FIG. 11, FIG.

  The difference from the second embodiment is that the power supply control device 60 mainly includes a restart instruction unit 68.

  The restart instructing unit 68 transmits a signal for restarting the camera unit 10 whose power supply is interrupted every predetermined time after sunset stored in the data storage unit 64 and before sunrise. Alternatively, a restart signal is transmitted from the signal transmitted from the signal transmission unit 65 to the camera unit 10 that is blocking power supply at regular intervals.

  The operation of the fifth embodiment will be described with reference to FIG.

  The camera unit 10 images a subject such as a river. When it is desired to magnify these subjects or to capture other angles, control such as zooming and turning of the camera unit is performed by the management server 33 via the camera control unit 21 in the machine-side control device 20. The image captured by the camera unit 10 is sent to each unit in the machine-side control unit 20 (step S1301).

  The image encoding unit 23 that receives an image from the camera unit 10 or an image in which characters are combined by the character combining unit 22 is an encoder that encodes image information by sampling and quantization. The encoded image data is sent to the transmission unit 24 (step S1302).

  The transmission unit 24 is connected by the communication network 100, and transmits the image data encoded by the image encoding unit 23 to the CCTV control unit 30 (step S1303).

  The transmission unit 31 that has received the image data encoded by the image encoding unit 23 via the network 100 sends the received data to the image decoding unit 32 and the primary determination unit 66.

  The image decoding unit 32 decodes the image data received by the transmission unit 31, and transmits the image data to the monitor 40 to be displayed on the screen (steps S1401 and 1402).

  The primary determination unit 66 determines whether the time when the image data is received by the transmission unit 31 is after the sunset time and before the sunrise time (step S1501).

  When it is after the sunset time and before the sunrise time (step S1501-Y), the image decoding unit 61 decodes the image data received by the transmission unit 31 and sends it to the image analysis unit 62 (step S1502).

  The image analysis unit 62 extracts the black portion of the image from the analog image data decoded by the image decoding unit 61. For example, the image analysis method can be performed by creating image data in a format that can be used by the image analysis unit 62 from an image captured by the camera unit 10. From the combination of the three primary colors of “Red R, Green G, Blue B”, for example, each pixel has a hexadecimal value of “R” from “33”, Green G from “33”, and Blue B from “33”. If the value is low, it may be possible to set a condition for determining that the color is black. These values may be stored in the data storage unit 64.

  It is also conceivable to create image data using “hue H, saturation S, brightness V” instead of “red R, green G, blue B”. Similar to “red R, green G, blue B”, “hue H, saturation S, brightness V” is determined for each pixel of the photographed image, and the saturation H is not less than a certain value. When V = 0.2 to V = 0.0, it is determined that the pixel is black.

  Note that for black calculation, not only the calculation method using the luminance value and the color value but also luminance, color distribution, edge amount, texture, and the like may be used (step S1503).

  The event determination unit 63 calculates the ratio of the black portion extracted by the image analysis unit 62 to the entire image. Specifically, it is determined how many black pixels are included in one frame. This can be calculated by dividing the total number of pixels of the photographed image by the black portion.

That is, (ratio of black) = (number of black pixels) / (number of pixels of image data)
Can be calculated as

  In this way, the ratio of black pixels in the image data is calculated (step S1504).

  This ratio is compared with the threshold value stored in the data storage unit 64 to determine whether or not the black ratio in the image (each image frame) is larger than the threshold value. In the determination, a threshold value used for determining whether or not the black ratio stored in the data storage unit 64 is equal to or greater than a certain value is used to determine whether the ratio is equal to or greater than the threshold value. (Step S1505).

  The event determination unit 63, when the ratio of the black part is determined to be equal to or greater than the threshold in the determination in step S304 via the signal transmission unit 65, the power supply unit 25 of the camera unit 10 that is determined to have the ratio of the black part equal to or greater than the threshold. An instruction to cut off the power supply to each predetermined part is transmitted to (step S1506).

  The power supply unit 25 that has received the interruption of the power supply performs a process of cutting off the power supply to the camera unit 10, the camera control unit 21, the character synthesis unit 22, and the image encoding unit 23 (step S1304).

  The restart instructing unit 68 transmits a signal for restarting the camera unit 10 whose power supply is interrupted every predetermined time after sunset stored in the data storage unit 64 and before sunrise. Alternatively, a restart signal is transmitted from the signal transmitted from the signal transmission unit 65 to the camera unit 10 whose power supply is cut off at regular intervals (step 1507).

  The power supply unit 25 that has received the resumption of power supply performs a process of supplying power to the camera unit 10, the camera control unit 21, the character synthesis unit 22, and the image encoding unit 23 (step S1305).

  In this embodiment, the power supply control device 60 is provided in the CCTV control device 30. However, as in the first embodiment, a program for demonstrating the function of the power supply control device 60 is provided in the management server 33. Also good.

  In this way, when monitoring rivers, sabo, etc. with no light at night, the captured image or image is analyzed, and the black part of the imaging range, that is, the part that does not serve as a captured image When the value exceeds an arbitrary threshold value, the power of some devices constituting the system is forcibly cut off. Thereby, the electric power consumed as the whole system can be reduced. Furthermore, the power consumed by the entire system can be further reduced by limiting the operation time of the power supply control device 60 or the power supply control function. In addition, by restarting at regular intervals, failure detection and malfunction can be prevented, and further system stability is realized.

  As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. For example, the “image” shown in the present embodiment may be a “video”. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Camera part 20 ... Machine side control part 21 ... Camera part control part 22 ... Character synthesis | combination part 23 ... Image encoding part 24 ... Transmission part 25 ... Power supply part 30 ... CCTV control part 31 ... Transmission part 32 ... Image decoding part 33 ... Management server 60 ... Power supply control device 62 ... Image analysis unit 63 ... Event determination unit 64 ... Data storage unit 66 ... Primary determination unit 67 ... Fault information reception unit 68 ... Reboot instruction unit 100 ... Communication network

Claims (7)

An imaging unit that shoots the subject and operates using power;
An extraction unit for extracting a black portion of the image acquired by the imaging unit;
From the extracted black part, a ratio of the black part in the image is calculated, and a determination unit that determines whether the ratio is equal to or greater than a threshold value;
When the determination unit determines that it is equal to or greater than the threshold, a power supply unit that cuts off power supply to the imaging unit;
An image monitoring system comprising: An analysis unit that calculates a ratio of a black portion of a decoded image captured by the imaging unit;
A determination unit for determining whether the ratio of the black portion is equal to or greater than a threshold;
A power control apparatus comprising: a signal transmission unit that sends an instruction to cut off power supply of the imaging unit to the imaging unit when the determination unit determines that the threshold is equal to or greater than the threshold value. A primary determination unit that determines whether or not the time when an image is sent from an imaging unit that operates using power and shoots an object to be shot is after sunset, before sunrise,
A decoding unit that decodes an image sent from an imaging unit that captures an object to be imaged and operates with electric power when the primary determination unit determines after sunset and before sunrise;
An analysis unit that calculates a ratio of a black portion of the image decoded by the decoding unit;
A determination unit for determining whether the ratio of the black portion is equal to or greater than a threshold;
A power control apparatus comprising: a signal transmission unit that sends an instruction to cut off power supply of the imaging unit to the imaging unit when the determination unit determines that the threshold is equal to or greater than the threshold value. The primary determination unit includes:
Determine whether the imaging unit that sent the image is faulty,
The decoding unit
The power supply control apparatus according to claim 3, wherein the image is decoded when the primary determination unit determines that the photographing unit is out of order. A decoding unit that decodes an image sent from a shooting unit that shoots a subject and uses electric power;
An analysis unit that calculates a ratio of a black portion of the image decoded by the decoding unit;
A determination unit that determines whether or not the ratio of the black portion is equal to or greater than a threshold, and whether or not the photographing unit is faulty;
A signal transmission unit for sending an instruction to shut off the power supply of the imaging unit to the imaging unit when the determination unit determines that the threshold is equal to or greater than the threshold value and the imaging unit is not malfunctioning. A power supply control device. A primary determination unit that determines whether or not the time when an image is sent from an imaging unit that operates using power and shoots an object to be shot is after sunset, before sunrise,
A decoding unit that decodes an image sent from an imaging unit that captures an object to be imaged and operates with electric power when the primary determination unit determines after sunset and before sunrise;
An analysis unit that calculates a ratio of a black portion of the image decoded by the decoding unit;
A determination unit for determining whether the ratio of the black portion is equal to or greater than a threshold;
A signal transmission unit that sends an instruction to shut off the power supply of the imaging unit to the imaging unit when the determination unit determines that the threshold is equal to or greater than the threshold;
A power supply control device comprising: an instruction unit that instructs the imaging unit to restart at regular intervals after sunset. A decoding process for decoding an image sent from a shooting unit that takes an image of a shooting target and operates with power;
An analysis process for calculating a ratio of a black portion of the image decoded by the decoding unit;
A determination process for determining whether the ratio of the black portion is equal to or greater than a threshold;
When the determination unit determines that the value is equal to or greater than the threshold value, a signal transmission process for sending an instruction to cut off power supply of the imaging unit to the imaging unit is operated on the power supply control device. Power control program.

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