JP2014138397A - Monitor image transmission apparatus, monitor image transmission system, monitor image transmission method, and monitor image transmission program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor image transmission apparatus, a monitor image transmission system, a monitor image transmission method, and a monitor image transmission program which are capable of preventing stringency of a communication band without losing evidence capability.SOLUTION: The monitor image transmission apparatus comprises: a transmission parameter setting unit 31 which receives a signal representing a suspicion level from a monitor image processing apparatus 11 for detecting one or plural suspicious areas from a captured image of a monitoring area being an area to be monitored and calculating the suspicion level of the detected suspicious areas, and sets the transmission parameter of an image to be transmitted to a radio terminal apparatus 15, on the basis of the suspicion level; and a transmission unit 32 which transmits an image relating to the monitoring area as a monitor image to the radio terminal apparatus 15, on the basis of the transmission parameter set by the transmission parameter setting unit 31.

Description

  The present invention relates to a monitoring image transmission device, a monitoring image transmission system, a monitoring image transmission method, and a monitoring image transmission program. The present invention relates to a transmission method and a monitoring image transmission program.

  Conventionally, a monitoring device has been proposed that monitors a suspicious person who has entered a monitoring area by imaging the monitoring area with an imaging device and detecting a suspicious area that is in a state different from the normal state from the captured image. Has been.

  As such a monitoring apparatus, for example, there is an apparatus including an image compression unit that obtains a compressed image by compressing a captured image, a suspicious detection unit that detects occurrence of suspiciousness, and an image quality changing unit that changes image quality. . In this monitoring apparatus, the image compression means includes an irreversible compression means for obtaining an irreversible compression image by irreversibly compressing the captured image, and an image decompression means for decompressing the irreversible compression image to obtain a reconstructed image. Is provided. The suspicious detection means detects the occurrence of suspiciousness by analyzing the reconstructed image, and the image quality changing means can control the irreversible compression means and the image expansion means so as to change the degree of irreversible compression. By repetitively changing the degree of irreversible compression, a relatively low-quality image and a relatively high-quality image are reconstructed as reconstructed images in a repetitive fixed time period. A normal mode that is controlled so as to be obtained in, and a suspicious mode that controls the reconstructed image to be a relatively high-quality image by reducing the degree of irreversible compression to zero or relatively low. (For example, refer to Japanese Patent No. 3522395 (Patent Document 1)).

Japanese Patent No. 3522395

  By the way, by transmitting the captured image of the monitoring area to the wireless terminal device by wireless communication, it is possible to monitor the status of the monitoring area from a remote location in real time. However, in many cases, the monitoring area is always imaged, and when all of the sequentially obtained captured images are transmitted to the wireless terminal device, the amount of data to be transmitted is enormous, which imposes a tight communication band. There is. In this case, there is a problem that it takes a long time to transmit the image, and the user cannot monitor the status of the monitoring area in real time.

  On the other hand, it may be possible to reduce the amount of image data to be transmitted to the wireless terminal device by performing image processing such as reducing the image quality of the captured image. However, it is suspicious because of the low image quality. The person's face cannot be clearly identified, and the evidence ability may be impaired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a monitoring image transmitting apparatus, a monitoring image transmitting system, and a monitoring that can prevent a communication band from being tight without impairing evidence capability. An image transmission method and a monitoring image transmission program are provided.

(1) In order to solve the above-described problem, a monitoring image transmission apparatus according to an aspect of the present invention detects one or a plurality of suspicious areas from captured images of a monitoring area that is an area to be monitored. Then, a signal indicating the suspicious level is received from the monitoring image processing device that calculates the detected suspicious level of the suspicious area, and a transmission parameter of an image to be transmitted to the wireless terminal device is set based on the suspicious level. A transmission parameter setting unit; and a transmission unit configured to transmit an image related to the monitoring area to the wireless terminal device as a monitoring image based on the transmission parameter set by the transmission parameter setting unit.

  With such a configuration, for example, a high image quality is set to obtain a detailed image in the event of an abnormality, and a low image quality is set to reduce the amount of data in a normal state. Since the image can be transmitted to the wireless terminal device, it is possible to prevent the communication band from being tight without impairing the evidence capability.

(2) Preferably, the transmission parameter setting unit sets an image quality and a frame rate as the transmission parameters.

  With such a configuration, for example, when an abnormality occurs, the image quality can be set high in order to obtain a detailed image, and the frame rate can be set low in order to prevent the communication band from being tight due to the high image quality. In addition, for example, during normal times, a communication is performed by setting a high frame rate and enabling the user to clearly grasp the movement of a person or the like existing in the monitoring area through the wireless terminal device. The image quality can be set low to prevent the band from becoming tight. As described above, since a plurality of types of transmission parameters can be adjusted in a well-balanced manner, an image can be transmitted to the wireless terminal device with more appropriate transmission parameters according to the situation of the monitoring area.

(3) Preferably, when the suspicious level calculated by the monitoring image processing apparatus is high, the transmission parameter setting unit displays the monitoring image having a higher image quality than the case where the suspicious level is low. The transmission parameter is set so as to be transmitted to the apparatus.

  In this way, when the suspicious level is high, a high-quality monitoring image is transmitted, so that an image that is highly likely to be used for obtaining evidence of an incident can be transmitted to the wireless terminal device as a clear image. , Can achieve high evidence ability.

(4) Preferably, the transmission parameter setting unit sets the transmission parameter so that the higher the suspicious level calculated by the monitoring image processing device is, the higher the quality of the monitoring image is transmitted to the wireless terminal device. Set in steps.

  As described above, with the configuration in which the image quality is set stepwise according to the suspicious level, a monitoring image having an appropriate image quality according to the suspicious level can be transmitted to the wireless terminal device.

(5) Preferably, when the suspicious level calculated by the monitoring image processing device is high, the transmission parameter setting unit transmits the suspicious level to the wireless terminal device at a lower frame rate than when the suspicious level is low. The transmission parameter is set so that the monitoring image is transmitted.

  In this way, when the suspicious level is high, the image is transmitted at a low frame rate, so that the communication band is prevented from becoming tight and the user can grasp the status of the monitoring area in real time through the wireless terminal device. It is possible to quickly respond to the abnormality that occurred in In addition, when the suspicious level is low, an image is transmitted at a high frame rate, so that the user can clearly grasp the movement of a person or the like existing in the monitoring area through the wireless terminal device. It is possible to easily determine whether or not this has occurred.

(6) Preferably, the transmission parameter setting unit is configured to transmit the monitoring image to the wireless terminal device at a lower frame rate as the suspicious level calculated by the monitoring image processing device is higher. Is set step by step.

  As described above, with the configuration in which the frame rate is set stepwise according to the suspicious level, it is possible to transmit a monitoring image with an appropriate frame rate according to the suspicious level to the wireless terminal device.

(7) Preferably, the transmission unit transmits an image after performing image processing based on the transmission parameter on the captured image to the wireless terminal device as the monitoring image.

  With such a configuration, an appropriate image corresponding to the set transmission parameter is transmitted to the wireless terminal device by using again the captured image used for detecting the suspicious region without newly capturing an image related to the monitoring region. can do.

(8) Preferably, the transmission unit transmits the transmission parameter set by the transmission parameter setting unit to the monitoring image processing device, and the monitoring image processing device newly captures the image according to the transmission parameter. The monitoring unit acquires a partial image of the monitoring area, the transmission unit acquires the partial image of the monitoring area from the monitoring image processing apparatus, and uses the acquired partial image of the monitoring area as the monitoring image. Transmit to the wireless terminal device.

  In this way, with the configuration in which a part of the monitoring area newly captured according to the transmission parameter is used as the monitoring image, a more appropriate image that cannot be obtained by image processing on the captured image used for detecting the suspicious area is obtained. It can be transmitted to the wireless terminal device.

(9) Preferably, the transmission parameter setting unit is configured to transmit an enlarged image of the suspicious area to the wireless terminal device when the suspicious level calculated by the monitoring image processing device is equal to or greater than a predetermined threshold. Set the above transmission parameters.

  With such a configuration, when the user confirms the image transmitted to the wireless terminal device, it is possible to easily identify the location where an abnormality has occurred. Further, since a detailed image of the suspicious area is transmitted to the wireless terminal device, for example, by storing the image in the wireless terminal device, high evidence ability can be realized after the occurrence of the incident.

(10) In order to solve the above-described problem, a monitoring image transmission system according to an aspect of the present invention detects one or a plurality of suspicious areas from captured images of a monitoring area that is a monitoring target area. And a monitoring image processing device for calculating the detected suspicious level of the suspicious area, a signal indicating the suspicious level from the monitoring image processing device, and a transmission parameter of an image to be transmitted to the wireless terminal device, A monitoring image transmission device that is set based on a suspicious level and that transmits an image related to the monitoring region as a monitoring image to the wireless terminal device based on the set transmission parameter.

  With such a configuration, for example, a high image quality is set to obtain a detailed image in the event of an abnormality, and a low image quality is set to reduce the amount of data in a normal state. Since the image can be transmitted to the wireless terminal device, it is possible to prevent the communication band from being tight without impairing the evidence capability.

(11) In order to solve the above-described problem, a monitoring image transmission method according to an aspect of the present invention detects one or a plurality of suspicious areas from captured images of a monitoring area that is an area to be monitored. And receiving a signal indicating the suspicious level from the monitoring image processing device that calculates the suspicious level of the detected suspicious area, and transmitting parameters of the image to be transmitted to the wireless terminal device based on the suspicious level. A step of setting, and a step of transmitting an image relating to the monitoring area to the wireless terminal device as a monitoring image based on the set transmission parameter.

  With such a configuration, for example, a high image quality is set to obtain a detailed image in the event of an abnormality, and a low image quality is set to reduce the amount of data in a normal state. Since the image can be transmitted to the wireless terminal device, it is possible to prevent the communication band from being tight without impairing the evidence capability.

(12) In order to solve the above-described problem, a monitoring image transmission program according to an aspect of the present invention provides a computer with one or more suspicious images from among captured images of a monitoring area that is an area to be monitored. A step of receiving a signal indicating the suspicious level from a monitoring image processing device that detects a region and calculates a suspicious level of the detected suspicious region; and a transmission parameter of an image to be transmitted to a wireless terminal device, the suspicious level And a step of transmitting an image related to the monitoring area as a monitoring image to the wireless terminal device based on the set transmission parameter.

  With such a configuration, for example, a high image quality is set to obtain a detailed image in the event of an abnormality, and a low image quality is set to reduce the amount of data in a normal state. Since the image can be transmitted to the wireless terminal device, it is possible to prevent the communication band from being tight without impairing the evidence capability.

  According to the present invention, it is possible to prevent a communication band from being tight without impairing evidence capacity.

It is a figure which shows the structure of the monitoring image transmission system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the monitoring image processing apparatus and monitoring image transmission apparatus of the monitoring image transmission system which concerns on embodiment of this invention. (A) is a figure which shows the captured image imaged with the imaging device of the monitoring image transmission system which concerns on embodiment of this invention, (b) is the monitoring which concerns on embodiment of this invention in normal time It is a figure which shows an example of the image transmitted to the radio | wireless terminal apparatus according to the transmission parameter set by the area | region setting part of the monitoring image transmission apparatus in an image transmission system. (A) is a figure which shows the captured image imaged with the imaging device of the monitoring image transmission system which concerns on embodiment of this invention, (b) is the monitoring which concerns on embodiment of this invention at the time of abnormality It is a figure which shows an example of the image transmitted to the radio | wireless terminal apparatus according to the transmission parameter set by the area | region setting part of the monitoring image transmission apparatus in an image transmission system. It is a flowchart which shows the procedure of the image transmission operation | movement by the monitoring image transmission system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the monitoring image processing apparatus and monitoring image transmission apparatus of the monitoring image transmission system which concerns on the modification of embodiment of this invention. (A) is a figure which shows the captured image imaged with the imaging device of the monitoring image transmission system which concerns on the modification of embodiment of this invention, (b) is embodiment of this invention in the time of abnormality It is a figure which shows an example of the image transmitted to the radio | wireless terminal apparatus according to the transmission parameter set by the area | region setting part of the monitoring image transmission system which concerns on the modification of this.

[Configuration and basic operation]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a diagram showing a configuration of a monitoring image transmission system according to an embodiment of the present invention. With reference to FIG. 1, the monitoring image transmission system 100 includes an imaging device 10, a monitoring image processing device 11, and a monitoring image transmission device 12. Note that the monitoring image transmission system 100 may not include the imaging device 10.

  The imaging apparatus 10 always captures a monitoring area that is an area to be monitored, and transmits captured image data to the monitoring image processing apparatus 11. Note that the imaging device 10 may capture an image of a monitoring area that is an area to be monitored and an area around the monitoring area. The imaging device 10 is, for example, a PTZ (pan / tilt / zoom) camera that can move the shooting direction vertically and horizontally and can adjust the angle of view. The captured image captured by the imaging device 10 has a data amount of 1.6 megabits per frame, for example. Note that the imaging device 10 may be a part of the components of the monitoring image processing device 11.

  The monitoring image processing device 11 detects one or a plurality of suspicious regions that are regions different from the normal state from the monitoring regions included in the captured image captured by the imaging device 10. Moreover, the monitoring image processing apparatus 11 calculates a suspicious level for each detected suspicious area.

  The suspicious level indicates the degree of difference between the image of the monitoring area included in the captured image used for detection of the suspicious area and the image of the monitoring area in a normal state. Is large.

  Then, the monitoring image processing apparatus 11 transmits data of the captured image, a signal indicating the calculated suspicious level, a signal indicating the coordinates of the suspicious area in the captured image, and the like to the monitoring image transmission apparatus 12.

  The monitoring image transmission device 12 transmits an image after image processing is performed on the captured image received from the monitoring image processing device 11 to the wireless terminal device 15 by wireless communication via the public line network 14. Specifically, first, the monitoring image transmission device 12 sets a transmission parameter of a monitoring image that is an image to be transmitted to the wireless terminal device 15 based on the suspicious level received from the monitoring image processing device 11.

  The transmission parameter indicates, for example, the frame rate of the monitoring image, the image quality of the monitoring image, or the position of an area (hereinafter also referred to as “transmission target area”) to be captured in the monitoring image. A combination of a plurality of types of transmission parameters such as rate, image quality, or transmission target area can be set.

  Then, based on the set transmission parameters, the monitoring image transmission device 12 performs various operations such as changing the frame rate, changing the image quality, or extracting a part of the captured image with respect to the captured image received from the monitoring image processing device 11. The monitoring image after the image processing is transmitted to the wireless terminal device 15.

  As a communication line in the public line network 14, for example, a 3G line for performing communication according to 3GPP (3rd Generation Partnership Project) standard is used. The transmission speed of the image using this 3G line is, for example, 3.6 megabits per second.

  The wireless terminal device 15 is a mobile terminal such as a mobile phone. A monitoring image transmitted from the monitoring image transmitting device 12 is displayed on the display unit of the wireless terminal device 15, and a user such as a monitor visually observes the display unit of the wireless terminal device 15, so that the status of the monitoring region is determined. Can be monitored.

  In the example shown in FIG. 1, one wireless terminal device 15 is shown, but the monitoring image transmission device 12 can also transmit a monitoring image to a plurality of wireless terminal devices 15. The monitoring image transmission system 100 may include a plurality of imaging devices 10 that capture different monitoring areas. In this case, the monitoring image transmission device 12 can also transmit images relating to a plurality of monitoring areas to the wireless terminal device 15 according to, for example, user's arbitrary settings.

[Problems in transmitting captured images to wireless terminal devices]
Here, as described above, the captured image captured by the imaging device 10 has a data amount per frame of, for example, 1.6 megabits, and the transmission speed of the image using the 3G line is, for example, 3.6 megabits per second. It is. For this reason, when all of the captured images that are always captured by the imaging device 10 are transmitted to the wireless terminal device 15 in real time using the public network 14, 2.25 (= 3.6 / 1.6). It is necessary to transmit at a frame rate of fps or less.

  However, when the captured image is transmitted at a low frame rate such as 2.25 fps or less, a video composed of the remaining images obtained by thinning out some images from a plurality of temporally continuous captured images is transmitted to the wireless terminal device 15. Will be. For this reason, for example, when a monitor or the like views the video displayed on the display unit of the wireless terminal device 15, it is difficult to clearly grasp the movement of the suspicious person or the like who has entered the monitoring area.

  On the other hand, if all of the captured images that are always captured by the imaging device 10 are transmitted to the wireless terminal device 15 at a frame rate higher than 2.25 fps, the communication band becomes tight and the arrival of the transmitted image at the wireless terminal device 15 is delayed. In this case, a supervisor or the like cannot monitor the status of the monitoring area through the wireless terminal device 15 in real time.

  Further, it is conceivable that the amount of data per frame of the captured image is reduced to less than 1.6 megabits and transmitted to the wireless terminal device 15 by performing image processing such as reducing the image quality of the captured image. However, in this case, the quality of the image transmitted to the wireless terminal device 15 is low, so that the face of the suspicious person cannot be clearly specified, and the evidence ability may be impaired.

  In view of the above circumstances, the monitoring image processing device 11 and the monitoring image transmission device 12 of the monitoring image transmission system 100 according to the embodiment of the present invention are configured as follows. Hereinafter, detailed configurations of the monitoring image processing apparatus 11 and the monitoring image transmission apparatus 12 will be described.

  FIG. 2 is a block diagram showing the configuration of the monitoring image processing device and the monitoring image transmission device of the monitoring image transmission system according to the embodiment of the present invention.

[Configuration of monitoring image processing apparatus]
Referring to FIG. 2, monitoring image processing apparatus 11 includes a video input unit 21 and a detection unit 24.

(A) Video Input Unit The video input unit 21 receives captured image data captured by the imaging device 10 and outputs the captured image data to the detection unit 24. Note that the video input unit 21 may be configured to receive an analog signal of a captured image from the imaging device 10. In this case, the video input unit 21 converts the analog signal of the captured image received from the imaging device 10 into a digital signal, and outputs the converted digital signal to the detection unit 24.

(B) Detection Unit The detection unit 24 receives data of the captured image from the video input unit 21 and detects one or more suspicious regions from the monitoring region included in the captured image. Specifically, the detection unit 24 uses, for example, a background difference method to determine the degree of difference between the monitoring region image included in the captured image received from the video input unit 21 and the monitoring region captured image in a normal state. To calculate.

  Specifically, first, the detection unit 24 acquires the luminance value of each pixel in the image of the monitoring area based on the captured image data received from the video input unit 21, and the acquired luminance value of each pixel in advance. A background difference value D1 (i, j), which is an absolute value of the difference between the luminance value of each pixel in the background image of the created monitoring area, is calculated.

  Then, the detection unit 24 performs binarization processing of “1” or “0” on the image of the monitoring area included in the captured image based on the background difference value D1 (i, j). Then, the detection unit 24 reads a binarized captured image, for example, using a frame about the size of a person as a detection frame, and a ratio P1 where “1” is given in the read detection frame is a predetermined value Pa. If it is above, it is determined that a person is shown in this detection frame.

  Note that the detection unit 24 can detect not only a person existing in the monitoring area but also other subjects existing in the monitoring area such as an object held by the person by the same arithmetic processing as described above. . As described above, the region where the subject detected by the detection unit 24 appears corresponds to a region in a different situation from the normal state, that is, a suspicious region.

  In addition, the detection unit 24 calculates a suspicious level for each detected suspicious area. Here, the suspicious level refers to, for example, a person's movement route, the position of the person with respect to a place where an object to be protected, such as an important cultural property, a certain place, a stay over a predetermined time, an object held by the person This is a value based on the movement speed of the person and the degree of crowding of the person, and is set in advance.

  For example, when a certain person stays at the same position for a predetermined time or more and the staying position is close to the place where the important cultural property exists, the suspicious levels for the respective actions are added together.

  Then, the detection unit 24 transmits the captured image data, a signal indicating the calculated suspicious level, a signal indicating the coordinates of the suspicious area in the captured image, and the like to the monitoring image transmission device 12.

[Configuration of surveillance image transmission device]
The monitoring image transmission device 12 includes a transmission parameter setting unit 31 and a transmission unit 32. The transmission parameter setting unit 31 includes an image quality setting unit 41, a frame rate setting unit 42, and an area setting unit 43.

(A) Image Quality Setting Unit The image quality setting unit 41 sets the image quality of an image transmitted to the wireless terminal device 15 based on the suspicious level calculated by the detection unit 24. More specifically, for example, the image quality setting unit 41 sets a higher image quality when the suspicious level calculated by the detection unit 24 is higher than when the suspicious level is low.

  Specifically, for example, when the suspicious level is less than the threshold value A1, the image quality setting unit 41 sets the monitoring image transmitted to the wireless terminal device 15 to a low value such as 0.16 megabit per frame. Set the quality of the monitoring image. On the other hand, when the suspicious level is equal to or higher than the threshold A1, the image quality setting unit 41 sets the monitoring image transmitted to the wireless terminal device 15 to a high value such as 0.4 megabit to 1.6 megabit per frame. Set the quality of the monitoring image. Then, the image quality setting unit 41 notifies the transmission unit 32 of the setting content.

  Then, the transmission unit 32 performs image quality change processing on the captured image in accordance with the setting contents, and transmits the image after the change processing as a monitoring image to the wireless terminal device 15 by wireless communication via the public line network 14.

  The case where the suspicious level calculated by the detection unit 24 is equal to or higher than the threshold value A1 is hereinafter also referred to as “abnormal time”. The case where the suspicious level calculated by the detection unit 24 is less than the threshold value A1 is also referred to as “normal time” hereinafter.

  In addition, the image quality setting unit 41 can set the image quality step by step so that the higher the suspicious level calculated by the detection unit 24 is, the higher quality image is transmitted to the wireless terminal device 15. The image quality setting unit 41 can set fine image quality according to the suspicious level by using a plurality of thresholds with fine intervals, for example.

(B) Frame Rate Setting Unit The frame rate setting unit 42 sets the frame rate of an image transmitted to the wireless terminal device 15 based on the suspicious level calculated by the detection unit 24. Here, as described above, the image quality setting unit 41 sets a higher image quality when the suspicious level is high than when the suspicious level is low. However, the higher the image quality of the monitoring image, the larger the amount of data, and the higher the possibility that the communication band will be tightened.

  For this reason, the frame rate setting unit 42 sets the frame rate when the suspicious level calculated by the detection unit 24 is high, that is, when the image quality set by the image quality setting unit 41 is high, compared to when the suspicious level is low. Set to a lower value.

  For example, when the suspicious level calculated by the detection unit 24 is less than the threshold value A1, the frame rate setting unit 42 sets the frame rate to a high value such as 22.5 fps. On the other hand, when the suspicious level calculated by the detection unit 24 is equal to or higher than the threshold A1, the frame rate setting unit 42 sets the frame rate to a low value in the range of 2.25 to 9 fps, for example. Then, the frame rate setting unit 42 notifies the transmission unit 32 of the setting content.

  Similarly to the above, the transmission unit 32 uses, as a monitoring image, an image obtained by thinning a part of images from a plurality of temporally continuous captured images so that the frame rate is changed according to the setting content. The data is transmitted to the wireless terminal device 15 by wireless communication via the line network 14.

  Further, the frame rate setting unit 42 may set the frame rate in stages so that the higher the suspicious level calculated by the detection unit 24 is, the lower the frame rate, the higher the suspicious image is transmitted to the wireless terminal device 15. it can. The frame rate setting unit 42 can set a fine frame rate according to the suspicious level by using a plurality of thresholds with fine intervals, for example.

(C) Region Setting Unit FIG. 3A is a diagram illustrating a captured image captured by the imaging device of the monitoring image transmission system according to the embodiment of the present invention, and FIG. FIG. 4 is a diagram illustrating an example of an image transmitted to a wireless terminal device according to a transmission parameter set by an area setting unit of the monitoring image transmission device in the monitoring image transmission system according to the embodiment of the present invention.

  With reference to Fig.3 (a), the imaging device 10 always image | photographs the image which shows a monitoring area | region and a periphery area | region, for example. Then, the data of the captured image captured by the imaging device 10 is output to the detection unit 24 via the video input unit 21.

  Then, the detection unit 24 detects one or a plurality of suspicious areas in the monitoring area from the captured image received from the video input unit 21, and calculates a suspicious level for each detected suspicious area.

  And the area setting part 43 of the monitoring image transmission apparatus 12 sets a monitoring area | region as a transmission object area | region at normal time, for example. Then, the area setting unit 43 outputs a transmission parameter indicating the set position of the transmission target area to the transmission unit 32.

  Then, the transmission unit 32 acquires a digital signal of the captured image from the video input unit 21 and extracts an image in which the monitoring region is captured from the captured image based on the transmission parameter received from the region setting unit 43. Then, as illustrated in FIG. 3B, the transmission unit 32 transmits the extracted image of the monitoring area to the wireless terminal device 15.

  FIG. 4A is a diagram illustrating a captured image captured by the imaging device of the monitoring image transmission system according to the embodiment of the present invention, and FIG. 4B is a diagram illustrating the implementation of the present invention in an abnormal state. It is a figure which shows an example of the image transmitted to the wireless terminal device according to the transmission parameter set by the area | region setting part of the monitoring image transmission apparatus in the monitoring image transmission system which concerns on a form.

  4A and 4B, region setting unit 43 sets, for example, a suspicious region as a transmission target region when an abnormality occurs. Then, the area setting unit 43 outputs a transmission parameter indicating the set position of the transmission target area to the transmission unit 32.

  And the transmission part 32 acquires the digital signal of the captured image shown to Fig.4 (a) from the video input part 21, and based on the transmission parameter received from the area | region setting part 43, it is a suspicious area | region among the area | regions reflected on a captured image. Extract an image that contains. And the transmission part 32 transmits the image of the extracted suspicious area | region to the radio | wireless terminal apparatus 15, as shown in FIG.4 (b).

  The transmission unit 32 may enlarge the image of the monitoring area or the image of the suspicious area extracted from the captured image to, for example, the same size as the captured image and transmit it to the wireless terminal device 15.

  Further, the area setting unit 43 sets the transmission target area so that, for example, an image of a person's face or hand existing in the suspicious area detected by the detection unit 24 is transmitted to the wireless terminal device 15 as a monitoring image. It is also possible.

  Specifically, the area setting unit 43 assumes that the upper periphery of the suspicious area is the position of the face of the person located in the suspicious area, or that the part where the movement is intense or the waist height is the position near the hand. The position of the face of the person or the position near the hand can be specified from the captured image, and the transmission parameter indicating the specified position can be transmitted to the transmission unit 32. Then, based on the transmission parameter received from the region setting unit 43, the transmission unit 32 extracts an image in which a person's face or hand located in the suspicious region is captured from the captured image acquired from the video input unit 21, The extracted image can be transmitted to the wireless terminal device 15.

  2 and 6, that is, the region setting unit 43 indicated by a broken line is not an essential component in the present invention. The surveillance video transmission apparatus 12 according to the embodiment of the present invention can achieve the object of the present invention without impairing the evidence capability and preventing the communication band from being constrained even if this component is not provided. It is.

(D) Transmitter When the transmitter 32 receives the setting content related to the image quality from the image quality setting unit 41, the transmitter 32 acquires a digital signal of the captured image from the video input unit 21, and performs a compression process on the captured image. Thus, the image quality is changed according to the set content, and the changed image is transmitted to the wireless terminal device 15.

  Note that the image quality setting unit 41 may determine whether or not to perform compression processing on the captured image depending on, for example, whether or not the suspicious level calculated by the detection unit 24 is less than the threshold value A1. In this case, the transmission unit 32 transmits, to the wireless terminal device 15, an image that has been subjected to compression processing on the captured image or an image that has not been subjected to compression processing on the captured image in accordance with the determination content received from the image quality setting unit 41. To do.

  Further, when receiving the setting content related to the frame rate from the frame rate setting unit 42, the transmission unit 32 acquires digital signals of a plurality of captured images from the video input unit 21, and changes the frame rate according to the setting content. As described above, the remaining images obtained by thinning out some images from the plurality of acquired images that are temporally continuous are transmitted to the wireless terminal device 15 as monitoring images.

  In addition, when receiving the setting content regarding the position of the transmission target region from the region setting unit 43, the transmission unit 32 acquires a digital signal of the captured image from the video input unit 21, and selects one of the captured images based on the setting content. Part is extracted. Then, the transmission unit 32 enlarges the extracted image to the same size as the captured image, and transmits the enlarged image to the wireless terminal device 15.

  The transmission unit 32 is not limited to the transmission parameter set by the transmission parameter setting unit 31. For example, when the transmission parameter is arbitrarily set by the user, the transmission unit 32 displays an image related to the monitoring area according to the transmission parameter set by the user. It can also be transmitted to the wireless terminal device 15.

  In addition, the transmission unit 32 transmits an image to the wireless terminal device 15 only in an abnormal time, and in normal times, for example, without transmitting an image, a text sentence indicating the normal time is transmitted to the wireless terminal device. 15 can also be transmitted. In addition, the user can arbitrarily set the timing at which the monitoring image is transmitted to the wireless terminal device 15 at the normal time.

  The monitoring image transmission system 100 may include a storage device, for example, and the monitoring image transmission device 12 may be configured to transmit the monitoring image not only to the wireless terminal device 15 but also to the storage device. As a result, since the monitoring image is stored in the storage device, when an incident or the like occurs in the monitoring area, it is possible to obtain powerful evidence that can be used for identifying the criminal from the images stored in the storage device. Can be used.

  In addition, as described above, for example, when the suspicious level calculated by the detection unit 24 is equal to or higher than the threshold A1, the transmission parameter setting unit 31 sets the image quality of the monitoring image high, sets the frame rate low, and sets the transmission target area. Set the suspicious area as

  However, the transmission parameter setting unit 31 is not limited to such a form. For example, the transmission parameter setting unit 31 determines whether or not the newly calculated suspicious level is equal to or higher than the threshold A1 for a predetermined time from the timing when the suspicious level equal to or higher than the threshold A1 is calculated. Regardless of the configuration, a configuration may be used in which transmission parameters are set in the event of an abnormality. Further, for example, after the suspicious level equal to or higher than the threshold A1 is calculated, the transmission parameter setting unit 31 sets the transmission parameter at the time of abnormality until a new suspicious level equal to or lower than the threshold A2 lower than the threshold A1 is calculated. A configuration such as setting may be used.

[Operation]
Next, an image transmission operation related to the monitoring area by the monitoring image transmission system 100 according to the embodiment of the present invention will be described. FIG. 5 is a flowchart showing a procedure of an image transmission operation by the monitoring image transmission system according to the embodiment of the present invention.

  The imaging device 10, the monitoring image processing device 11, and the monitoring image transmission device 12 of the monitoring image transmission system 100 read out and execute a program including each step of the following flowcharts from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a storage medium, for example.

  With reference to FIG. 5, first, for example, when a monitoring region and a peripheral region are imaged by the imaging device 10, a digital signal of the captured image is sent to the detection unit 24 via the video input unit 21 of the monitoring image processing device 11. Is output. And the detection part 24 acquires the digital signal of the captured image received from the video input part 21 (step S1).

  Next, based on the digital signal of the captured image, the detection unit 24 detects a subject such as a person or the like existing in the monitoring region in the region captured in the captured image. Then, the detection unit 24 calculates the suspicious level of the area where the detected subject is captured, that is, the suspicious area (step S2).

  Next, the transmission parameter setting unit 31 determines whether or not a suspicious area having a suspicious level equal to or higher than the threshold A1 is detected in an image in which the monitoring area is captured (step S3). If the transmission parameter setting unit 31 determines that a suspicious area having a suspicious level equal to or higher than the threshold A1 is detected in the image in which the monitoring area is captured (“Yes” in step S3), the transmission at the time of abnormality based on the determination result Set the parameters.

  That is, the transmission parameter setting unit 31 sets the image quality of the monitoring image to be high and sets the frame rate of the monitoring image to be low when a suspicious area having a suspicious level equal to or higher than the threshold A1 is detected in the image in which the monitoring area is captured. The suspicious area is set as the transmission target area. Then, the transmission parameter setting unit 31 outputs the set transmission parameter to the transmission unit 32.

  Then, the transmission unit 32 transmits the image after image processing based on the transmission parameter received from the transmission parameter setting unit 31 to the wireless terminal device 15 via the public line network 14 (step S4). As a result, the image transmitted from the transmission unit 32 is displayed on the monitor of the wireless terminal device 15.

  Next, the detection unit 24 of the monitoring image processing apparatus 11 acquires a digital signal of a captured image newly captured by the imaging apparatus 10 (step S1), and the above-described operation is repeated.

  On the other hand, if the transmission parameter setting unit 31 determines that a suspicious area having a suspicious level equal to or higher than the threshold A1 is not detected in the image in which the monitoring area is captured (“No” in step S3), the transmission parameter setting unit 31 performs normal transmission based on the determination result. Set the parameters.

  That is, the transmission parameter setting unit 31 sets the image quality of the monitoring image to a low level and sets the frame rate of the monitoring image to a high level when the suspicious area having a suspicious level equal to or higher than the threshold A1 is not detected in the image in which the monitoring area is captured. An area is set as a transmission target area. Then, the transmission parameter setting unit 31 outputs the set transmission parameter to the transmission unit 32.

  Then, the transmission unit 32 transmits the image after performing image processing based on the transmission parameter received from the transmission parameter setting unit 31 to the wireless terminal device 15 via the public line network 14 (step S5). As a result, the image transmitted from the transmission unit 32 is displayed on the monitor of the wireless terminal device 15.

(Modification)
In the monitoring image transmission system 100 according to the above-described embodiment of the present invention, the transmission unit 32 of the monitoring image transmission device 12 transmits the image set by the transmission parameter setting unit 31 with respect to the image captured by the imaging device 10. Image processing is performed based on the parameter, and the image is transmitted to the wireless terminal device 15. Specifically, when receiving the setting content related to the position of the transmission target region from the region setting unit 43, the transmission unit 32 extracts, for example, a suspicious region from the captured image acquired from the video input unit 21. An image obtained by enlarging the image to the same size as the captured image is transmitted to the wireless terminal device 15.

  On the other hand, in the monitoring image transmission system 200 according to the modification of the embodiment of the present invention, the transmission unit 32 of the monitoring image transmission apparatus 12 is newly set based on the transmission parameter set by the transmission parameter setting unit 31. A part of the image of the monitoring area captured is acquired, and this image is transmitted to the wireless terminal device 15 as a monitoring image.

  FIG. 6 is a block diagram illustrating a configuration of a monitoring image processing device and a monitoring image transmission device of a monitoring image transmission system according to a modification of the embodiment of the present invention.

  Referring to FIG. 6, monitoring image processing apparatus 11 of monitoring image transmission system 200 according to a modification of the embodiment of the present invention includes components included in monitoring image processing apparatus 11 of monitoring image transmission system 100 shown in FIG. 2. In addition, an imaging control unit 25 is further included.

  Similar to the region setting unit 43 of the monitoring image transmission system 100 according to the embodiment of the present invention described above, the region setting unit 43 of the monitoring image transmission device 12 is based on the suspicious level calculated by the detection unit 24. Set the area. Then, the area setting unit 43 outputs a transmission parameter indicating the set position of the transmission target area to the transmission unit 32. Then, the transmission unit 32 transmits the transmission parameter received from the region setting unit 43 to the imaging control unit 25.

  When receiving the transmission parameter indicating the position of the transmission target area from the transmission unit 32, the imaging control unit 25 controls the imaging device 10 based on the transmission parameter. Then, the imaging device 10 captures an enlarged image of the transmission target area set by the area setting unit 43.

  Then, the imaging device 10 transmits an image captured in accordance with control by the imaging control unit 25 to the video input unit 21. Then, the transmission unit 32 acquires a digital signal of the image from the video input unit 21 and transmits this digital signal to the wireless terminal device 15.

  Hereinafter, it demonstrates more concretely using FIG. Fig.7 (a) is a figure which shows the captured image imaged with the imaging device of the monitoring image transmission system which concerns on the modification of embodiment of this invention, FIG.7 (b) shows this invention in the time of abnormality. It is a figure which shows an example of the image transmitted to the radio | wireless terminal apparatus according to the transmission parameter set by the area | region setting part of the monitoring image transmission system which concerns on the modification of embodiment.

  With reference to Fig.7 (a), the imaging device 10 always images the image of the monitoring area. Then, the data of the monitoring area image captured by the imaging device 10 is output to the detection unit 24 via the video input unit 21.

  Then, the detection unit 24 detects one or more suspicious regions included in the monitoring region from the image received from the video input unit 21, that is, the image of the monitoring region, and the suspicious level for each detected suspicious region. Is calculated.

  Then, when the suspicious level equal to or higher than the threshold A1 is calculated, that is, when there is an abnormality, the region setting unit 43 sets, for example, a suspicious region with a suspicious level equal to or higher than the threshold A1 as a transmission target region. Then, the area setting unit 43 outputs a transmission parameter indicating the set position of the transmission target area to the transmission unit 32, and the transmission unit 32 transmits the transmission parameter to the imaging control unit 25. When receiving the transmission parameter indicating the position of the transmission target area from the transmission unit 32, the imaging control unit 25 controls the imaging device 10 based on the transmission parameter.

  Then, the imaging apparatus 10 newly captures an image having a smaller angle of view than the image of the monitoring area illustrated in FIG. 7A, that is, an enlarged image of the suspicious area illustrated in FIG. The video input unit 21 acquires enlarged image data of the suspicious area newly captured by the imaging device 10. Then, the transmission unit 32 acquires a digital signal of the enlarged image from the video input unit 21 and transmits the acquired enlarged image to the wireless terminal device 15.

  In the above-described example, after the transmission target area is set by the area setting unit 43, the imaging device 10 is controlled by the imaging control unit 25 to capture a new image. However, the present invention is not limited to such a form. For example, when a plurality of imaging devices 10 are provided and an image of the monitoring area and a part of the monitoring area can be captured in parallel, the transmission target After setting the area, the transmission unit 32 can acquire an enlarged image according to the transmission parameter without capturing a new image.

  By the way, by transmitting the captured image of the monitoring area to the wireless terminal device by wireless communication, it is possible to monitor the status of the monitoring area from a remote location in real time. However, in many cases, the monitoring area is always imaged, and when all of the sequentially obtained captured images are transmitted to the wireless terminal device, the amount of data to be transmitted is enormous, which imposes a tight communication band. There is. In this case, there is a problem that it takes a long time to transmit the image, and the user cannot monitor the status of the monitoring area in real time.

  On the other hand, it may be possible to reduce the amount of image data to be transmitted to the wireless terminal device by performing image processing such as reducing the image quality of the captured image. However, it is suspicious because of the low image quality. The person's face cannot be clearly identified, and the evidence ability may be impaired.

  On the other hand, in the monitoring image transmission apparatus 12 according to the embodiment of the present invention, the transmission parameter setting unit 31 has one or more suspicious images from the captured images of the monitoring area that is the area to be monitored. A signal indicating the suspicious level is received from the monitoring image processing device 11 that detects the region and calculates the suspicious level of the detected suspicious region, and the transmission parameter of the image to be transmitted to the wireless terminal device 15 is determined based on the suspicious level. Set. Further, the transmission unit 32 transmits an image related to the monitoring area to the wireless terminal device 15 as a monitoring image based on the transmission parameter set by the transmission parameter setting unit 31.

  With such a configuration, for example, a high image quality is set to obtain a detailed image in the event of an abnormality, and a low image quality is set to reduce the amount of data in a normal state. Since the image can be transmitted to the wireless terminal device 15, it is possible to prevent the communication band from being tight without impairing the evidence capability.

  Moreover, in the monitoring image transmission device 12 according to the embodiment of the present invention, the transmission parameter setting unit 31 sets the image quality and the frame rate as the transmission parameters.

  With such a configuration, for example, when an abnormality occurs, the image quality can be set high in order to obtain a detailed image, and the frame rate can be set low in order to prevent the communication band from being tight due to the high image quality. In addition, for example, during normal times, the frame rate is set high to enable the user to clearly grasp the movement of a person or the like existing in the monitoring area through the wireless terminal device 15, and the frame rate is high. Image quality can be set low to prevent tight communication bandwidth. As described above, since a plurality of types of transmission parameters can be adjusted in a well-balanced manner, an image can be transmitted to the wireless terminal device 15 with more appropriate transmission parameters in accordance with the situation of the monitoring area.

  In the monitoring image transmission device 12 according to the embodiment of the present invention, the transmission parameter setting unit 31 has a higher image quality when the suspicious level calculated by the monitoring image processing device 11 is higher than when the suspicious level is low. The transmission parameter is set so that a monitoring image having a high value is transmitted to the wireless terminal device 15.

  As described above, when the suspicious level is high, a high-quality monitoring image is transmitted, so that an image that is highly likely to be used for acquiring evidence of an incident can be transmitted to the wireless terminal device 15 as a clear image. Therefore, high evidence ability can be realized.

  Moreover, in the monitoring image transmission device 12 according to the embodiment of the present invention, the transmission parameter setting unit 31 causes the monitoring image with higher image quality to be transmitted to the wireless terminal device 15 as the suspicious level calculated by the monitoring image processing device 11 is higher. Set transmission parameters in stages so that they are transmitted.

  As described above, with the configuration in which the image quality is set stepwise according to the suspicious level, a monitoring image with an appropriate image quality according to the suspicious level can be transmitted to the wireless terminal device 15.

  Further, in the monitoring image transmission device 12 according to the embodiment of the present invention, the transmission parameter setting unit 31 has a low suspicious level calculated by the monitoring image processing device 11 as compared with a low suspicious level. Transmission parameters are set so that the monitoring image is transmitted to the wireless terminal device 15 at the frame rate.

  As described above, when the suspicious level is high, the image is transmitted at a low frame rate, so that the communication band can be prevented from being tight, and the user can grasp the status of the monitoring area in real time through the wireless terminal device 15. It is possible to quickly respond to an abnormality occurring in the area. In addition, when the suspicious level is low, an image is transmitted at a high frame rate, so that the user can clearly grasp the movement of a person or the like existing in the monitoring area through the wireless terminal device 15. It is possible to easily determine whether or not an abnormality has occurred.

  In the monitoring image transmission device 12 according to the embodiment of the present invention, the transmission parameter setting unit 31 sends the monitoring image to the wireless terminal device 15 at a lower frame rate as the suspicious level calculated by the monitoring image processing device 11 is higher. The transmission parameters are set in stages so that is transmitted.

  As described above, with the configuration in which the frame rate is set stepwise according to the suspicious level, a monitoring image with an appropriate frame rate according to the suspicious level can be transmitted to the wireless terminal device 15.

  Moreover, in the monitoring image transmission device 12 according to the embodiment of the present invention, the transmission unit 32 transmits an image after performing image processing based on transmission parameters on the captured image to the wireless terminal device 15 as a monitoring image. To do.

  With such a configuration, an appropriate image corresponding to the set transmission parameter is re-used using the captured image used for detecting the suspicious area without newly capturing an image related to the monitoring area, to the wireless terminal device 15. Can be sent.

  In the monitoring image transmission device 12 according to the modification of the embodiment of the present invention, the transmission unit 32 transmits the transmission parameter set by the transmission parameter setting unit 31 to the monitoring image processing device 11. In addition, the monitoring image processing apparatus 11 acquires a partial image of the monitoring area newly captured according to the transmission parameter. In addition, the transmission unit 32 acquires a partial image of the monitoring area from the monitoring image processing apparatus 11 and transmits the acquired partial image of the monitoring area to the wireless terminal device 15 as a monitoring image.

  In this way, with the configuration in which a part of the monitoring area newly captured according to the transmission parameter is used as the monitoring image, a more appropriate image that cannot be obtained by image processing on the captured image used for detecting the suspicious area is obtained. It can be transmitted to the wireless terminal device 15.

  Moreover, in the monitoring image transmission device 12 according to the embodiment of the present invention, the transmission parameter setting unit 31 wirelessly transmits an enlarged image of the suspicious area when the suspicious level calculated by the monitoring image processing device 11 is equal to or higher than the threshold A1. Transmission parameters are set so as to be transmitted to the terminal device 15.

  With such a configuration, when the user confirms the image transmitted to the wireless terminal device 15, it is possible to easily identify the location where an abnormality has occurred. In addition, since a detailed image of the suspicious area is transmitted to the wireless terminal device 15, for example, by storing the image in the wireless terminal device 15, high evidence ability can be realized after an incident occurs.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Imaging device 11 Surveillance image processing device 12 Surveillance image transmission device 14 Public line network 15 Wireless terminal device 21 Video | video input part 24 Detection part 25 Imaging control part 31 Transmission parameter setting part 32 Transmission part 41 Image quality setting part 42 Frame rate setting part 43 Area setting unit 100 Monitoring image transmission system 200 Monitoring image transmission system

Claims (12)

The suspicious level is indicated from a monitoring image processing device that detects one or a plurality of suspicious areas from the captured image of the monitoring area, which is an area to be monitored, and calculates the suspicious level of the detected suspicious area. A transmission parameter setting unit configured to receive a signal and set a transmission parameter of an image to be transmitted to the wireless terminal device based on the suspicious level;
A monitoring image transmission device comprising: a transmission unit configured to transmit an image related to the monitoring region as a monitoring image to the wireless terminal device based on the transmission parameter set by the transmission parameter setting unit.   The monitoring image transmission device according to claim 1, wherein the transmission parameter setting unit sets an image quality and a frame rate as the transmission parameters.   When the suspicious level calculated by the monitoring image processing device is high, the transmission parameter setting unit is configured to transmit the monitoring image having a higher image quality to the wireless terminal device than when the suspicious level is low. The monitoring image transmission device according to claim 1, wherein the transmission parameter is set in the transmission image.   The transmission parameter setting unit sets the transmission parameter stepwise so that the higher the suspicious level calculated by the monitoring image processing device is, the higher the quality of the monitoring image is transmitted to the wireless terminal device, The monitoring image transmission apparatus according to claim 3.   The transmission parameter setting unit transmits the monitoring image to the wireless terminal device at a lower frame rate when the suspicious level calculated by the monitoring image processing device is higher than when the suspicious level is low. The monitoring image transmission apparatus according to any one of claims 1 to 4, wherein the transmission parameter is set as follows.   The transmission parameter setting unit sets the transmission parameter stepwise so that the monitoring image is transmitted to the wireless terminal device at a lower frame rate as the suspicious level calculated by the monitoring image processing device is higher. The monitoring image transmitting apparatus according to claim 5.   The said transmission part transmits the image after performing the image process based on the said transmission parameter with respect to the said captured image to the said radio | wireless terminal apparatus as the said monitoring image, The any one of Claim 1-6 The monitoring image transmission device described in 1. The transmission unit transmits the transmission parameter set by the transmission parameter setting unit to the monitoring image processing device,
The monitoring image processing device acquires a partial image of the monitoring area newly imaged according to the transmission parameter,
The transmission unit acquires a partial image of the monitoring region from the monitoring image processing device, and transmits the acquired partial image of the monitoring region to the wireless terminal device as the monitoring image. The monitoring image transmission device according to claim 6.   The transmission parameter setting unit sets the transmission parameter so that an enlarged image of the suspicious area is transmitted to the wireless terminal device when the suspicious level calculated by the monitoring image processing device is equal to or greater than a predetermined threshold. The monitoring image transmission apparatus according to any one of claims 1 to 8. A monitoring image processing device that detects one or a plurality of suspicious areas from the captured image of the monitoring area that is an area to be monitored, and calculates a suspicious level of the detected suspicious area;
A signal indicating the suspicious level is received from the monitoring image processing device, a transmission parameter of an image to be transmitted to a wireless terminal device is set based on the suspicious level, and the monitoring is performed based on the set transmission parameter. A monitoring image transmission system comprising: a monitoring image transmission device that transmits an image relating to an area to the wireless terminal device as a monitoring image. The suspicious level is indicated from a monitoring image processing device that detects one or a plurality of suspicious areas from the captured image of the monitoring area, which is an area to be monitored, and calculates the suspicious level of the detected suspicious area. Receiving a signal; and
Setting a transmission parameter of an image to be transmitted to the wireless terminal device based on the suspicious level;
And a step of transmitting an image relating to the monitoring area as a monitoring image to the wireless terminal device based on the set transmission parameter. On the computer,
The suspicious level is indicated from a monitoring image processing device that detects one or a plurality of suspicious areas from the captured image of the monitoring area, which is an area to be monitored, and calculates the suspicious level of the detected suspicious area. Receiving a signal; and
Setting a transmission parameter of an image to be transmitted to the wireless terminal device based on the suspicious level;
A monitoring image transmission program for executing the step of transmitting an image relating to the monitoring area as a monitoring image to the wireless terminal device based on the set transmission parameter.

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