JP2013031108A - Monitoring system - Google Patents

Abstract

The present invention provides a technique capable of photographing a railway vehicle while covering a blind spot caused by an obstacle in a photographing region.
A camera is installed so as to photograph a vehicle that is a monitoring space. The mirror 12 is installed in the imaging area of the camera 11 so as to project a range where the obstruction 13 such as a hanging advertisement becomes a blind spot of the camera 11. The image processing unit extracts the mirror image G12 ′ from the captured image G11 of the camera 11, performs the reversal process and the enlargement process, and records the captured image G11 and the mirror image G12 after the image processing in the recording unit. The display control unit reads the recorded captured image G11 and the mirror image G12, reproduces them in synchronization, and displays the captured range of the camera 11 and the reflected range of the mirror 12 in the vehicle layout diagram G1.
[Selection] Figure 4

Description

  The present invention relates to a monitoring system for monitoring a monitoring space, and more particularly to a monitoring system installed in a railway vehicle.

  In recent years, surveillance cameras are installed in various places, and recorded images of surveillance cameras are utilized when an incident occurs.

  For example, a railway vehicle is known in which an emergency notification device with a camera is arranged in front and rear of the vehicle (see, for example, Patent Document 1). In this railway vehicle, when one of the emergency call devices is pressed by a passenger, the image of the reporter taken with the camera of the pressed emergency call device and the vehicle interior shot with the camera of the other emergency call device Are transmitted to the emergency call receiver installed in the crew room. When the crew member receives an emergency call and makes a call with the caller, the crew can grasp the situation while watching both the caller and the situation in the vehicle.

  There is also known a monitoring device that reduces the number of installed monitoring cameras and captures a wide area inside the store (see, for example, Patent Document 2). In this monitoring apparatus, a camera installed opposite to the convex mirror axis is used to capture a reflected virtual image in the store that is reflected on the convex mirror, and to perform a conversion process that reverses the left and right without distorting the captured image. An image captured and converted by another camera is combined and displayed on the monitor screen in a form close to that in the store. Further, in this monitoring apparatus, when the enlarged display is performed, the enlarged image information is generated and displayed from the recorded image without zooming up the camera, so that the blind spot of the camera is not created.

  Similarly, as a monitoring device using a mirror, there is known a vehicle monitoring device in which a reflection mirror is arranged at a position where a hood of a car is photographed in a photographing area of a camera that photographs the front of the car ( For example, see Patent Document 3). In this vehicle monitoring apparatus, a single camera is used to simultaneously photograph the front outside the vehicle and the vehicle interior reflected by the reflecting mirror.

JP 2009-056821 A JP 2004-153492 A JP 2007-313950 A

  By the way, a suspension advertisement or the like is often provided on a railway vehicle, and a blind spot is likely to be generated in the surveillance camera by being obstructed by an obstacle such as a suspension advertisement. In order to cover the blind spot of such a surveillance camera, a plurality of cameras may be installed as in the technique described in Patent Document 1, but in a railway vehicle, installation space, power supply, and communication cable are installed. There were many restrictions on the cost and the burden on the cost.

  Further, in the technique described in Patent Document 2 and the technique described in Patent Document 3, when there is an obstacle in the imaging region, the blind spot of the camera due to the obstacle cannot be covered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique capable of capturing an inside of a railway vehicle while covering a blind spot due to an obstacle in an imaging region.

  The monitoring system of the present invention is a photographing means for photographing the inside of a railway vehicle, a mirror that is provided in a photographing area and reflects a range that becomes a blind spot of the photographing means due to an obstacle, extracts a mirror image from a photographed image, and An image processing means for reversing and enlarging the mirror image; a recording means connected to the photographing means via the network; and recording the photographed image and the mirror image processed by the image processing means; Display control means for reproducing the recorded photographed image and the mirror image in synchronization is provided.

  According to the present invention, the inside of a railway vehicle can be photographed while covering a blind spot due to an obstacle in the photographing region.

It is a functional block diagram which shows the structure of the monitoring system of embodiment which concerns on this invention. FIG. 2 is a layout view of a vehicle in which a camera and a mirror of the monitoring system shown in FIG. 1 are arranged. It is an image figure of the picked-up image and mirror image which the image processing part shown in FIG. 1 acquires. It is an example of a display screen of the display part shown in FIG. It is a flowchart which shows the flow of a process of the monitoring system shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a functional block diagram showing a configuration of a railway vehicle monitoring system. FIG. 2 is a layout diagram showing a positional relationship between a camera installed in the vehicle, a mirror, and an obstacle such as a hanging advertisement. The monitoring system X includes a camera 11, a mirror 12, a video recording device 2, a video playback device 3, and a network 4 arranged in the monitoring space. 1 and 2, only one vehicle 1 is shown and the other vehicles 1 are omitted, but it is assumed that a camera 11 and a mirror 12 are arranged in each vehicle 1.

  The camera 11 is configured by a network camera or the like, can shoot at an ultra-high resolution, and has an image distribution function for compressing a captured image with JPEG or the like and distributing it via the network 4. Moreover, the camera 11 is installed in the vehicle 1 so that the longitudinal direction of the vehicle 1 which is monitoring space may be image | photographed.

  The mirror 12 is installed in the vicinity of an obstacle 13 such as a hanging advertisement provided in the shooting area of the camera 11. On the mirror surface of the mirror 12 viewed from the camera 11, the opposite surface side of the obstacle 13 with respect to the camera 11, that is, a range where the blind spot of the camera 11 is formed. The mirror 12 is installed in the vehicle 1 with its installation angle adjusted so that the mirror surface is photographed by the camera 11 and the range where the obstacle 13 becomes the blind spot of the camera 11 is reflected on the mirror surface.

  The video recording device 2 includes a network recording device connected to the camera 11 via the network 4 and includes an image processing unit 21 and a recording unit 22.

  The image processing unit 21 acquires a captured image of the camera 11 via the network 4 and extracts a mirror image of the mirror 12 from the captured image. The image processing unit 21 performs left / right inversion processing of the extracted mirror image. The image processing unit 21 enlarges the mirror image. The image processing unit 21 may perform the enlargement process after performing the mirror image reversal process, or may perform the reversal process after performing the enlargement process.

  FIG. 3 shows a captured image G11 taken by the camera 11 on the left side of the drawing, and a mirror image G12 image-processed by the image processing unit 21 on the right side of the drawing. As shown in FIG. 3, first, when the image processing unit 21 acquires the captured image G11 of the camera 11, the position of the mirror 12 is detected from the captured image G11, and the mirror image G12 ′ is detected from the detected position of the mirror 12. Extract. The mirror image G12 ′ is an image before being subjected to image processing by the image processing unit 21. Then, the image processing unit 21 performs inversion processing and enlargement processing on the extracted mirror image G12 ′ to generate a mirror image G12 that is an image after image processing.

  Returning to FIG. 1, the image processing unit 21 causes the recording unit 22 to record the captured image G11 (the original image before editing by the image processing unit 21) and the mirror image G12 subjected to the image processing in association with each other. For example, the image processing unit 21 may synchronize the captured image G11 and the mirror image G12 on the time axis and record them in the recording unit 22 as one image data (at the corresponding imaging time). Further, the image processing unit 21 may record the identification number of the camera 11 or the identification number of the vehicle 1 in association with the captured image G11 and the mirror image G12 in order to identify the captured vehicle 1.

  The recording unit 22 records the captured image G11 captured by the camera 11 and the mirror image G12 subjected to image processing by the image processing unit 21 as a moving image.

  The video reproduction device 3 includes a display control unit 31 and a display unit 32. The display control unit 31 reads, for example, the captured image G11 and the mirror image G12 corresponding to the specified vehicle number and the imaging period from the recording unit 22 in accordance with a user operation, and the captured image G11 and the mirror image G12. Are reproduced simultaneously and displayed on the display unit 32. At that time, the display control unit 31 reflects the shooting range (view angle) of the shot image G11 and the mirror image G12 in the full-size vehicle layout drawing. The shooting range of the camera 11 may be calculated in advance based on the installation position of the camera 11 and the mirror 12, the focal length information of the lens of the camera 11, the reflection characteristics of the mirror 12, vehicle dimension information, and the like.

  FIG. 4 is a display screen example of the display unit 32. As shown in FIG. 4, the photographed image G11 and the mirror image G12 are displayed together and are reproduced in synchronization with each photographing time. For this reason, in the captured image G11, it is possible to confirm what happened on the spot at that time with respect to the portion that is not reflected by the obstacle 13 and is not reflected. In FIG. 4, the shooting range of the camera 11 (shown by a solid line in the vehicle layout diagram G1 in FIG. 4) and the shooting (reflection) range of the mirror 12 (shown by a dotted line in the vehicle layout diagram G1 in FIG. 4) are the original size. This is reflected in the vehicle arrangement diagram G1.

  Next, the flow of processing of the monitoring system X will be described with reference to FIG.

  In step A10, the camera 11 images the monitoring space. In step A <b> 11, the image processing unit 21 acquires a captured image G <b> 11 of the camera 11. In step A12, the image processing unit 21 extracts a mirror image G12 ′ from the acquired captured image G11. In step A13, the image processing unit 21 performs a reversal process on the extracted mirror image G12 ′ to generate a mirror image G12 ″. In step A14, the image processing unit 21 performs an enlargement process of the mirror image G12 ″ to generate a mirror image G12 that has been subjected to the image processing.

  In step A15, the image processing unit 21 associates the captured image G11 with the mirror image G12 and causes the recording unit 22 to record them.

  In step A <b> 16, the display control unit 31 reads out the captured image G <b> 11 and the mirror image G <b> 12 recorded in the recording unit 22 and displays them in synchronization according to the user's operation. Thus, this process ends.

  Accordingly, the monitoring system X can capture the inside of the vehicle 1 while covering the blind spot due to the obstacle 13 in the imaging region. Therefore, since it is not necessary to add the camera 11 to cover the blind spot, there is no need to worry about restrictions on the installation space, power supply, communication cable, etc. of the added camera 11, and the installation cost is reduced. can do.

  Although not shown in FIG. 2, a plurality of mirrors 12 may be installed in the vehicle 1. In this case, the mirror surface of each mirror 12 should just image | photograph the mirror surface of at least 1 mirror 12 with the camera 11 directly. The mirror surface of the other mirror 12 that is not directly photographed by the camera 11 may be reflected on the mirror surface of the mirror 12 that is photographed directly by the camera 11 via the mirror surface of the other mirror 12 or directly. That is, the mirror 12 that is not directly photographed by the camera 11 may be indirectly photographed by the camera 11 as a combined mirror.

  In this case, when extracting the mirror image G12 ′ from the photographed image G11, the image processing unit 21 also extracts the mirror image G12 ′ included in the mirror image G12 ′ and performs the reverse enlargement process, so What is necessary is just to make it record on the recording part 22 in association with the mirror image G12. In addition, since the image of the mirror 12 reflected twice by the mirror 12 returns to the original inversion, the image processing unit 21 determines the mirror image G12 ′ included in the mirror image G12 ′ based on the arrangement relationship of the mirrors 12. Is reflected on the mirror 12 for a few times, the enlargement process may be performed without performing the inversion process.

  Further, a recognition mark may be provided on the mirror 12 so that the image processing unit 21 can easily extract the mirror image G12 ′ from the captured image. For example, the recognition mark may be a predetermined object pattern drawn on the outer frame of the mirror 12 or the like. Also, by making the recognition mark distinguishable on the left and right of the mirror 12, whether or not to perform the reversal process is determined by the image processing unit 21 depending on whether or not the recognition mark of the mirror image G12 ′ is reversed left and right. You can also. That is, if the recognition mark of the extracted mirror image G12 ′ is reversed left and right, the image processing unit 21 performs left-right reversal processing on the mirror image G12 ′ to perform enlargement processing, and the recognition mark of the mirror image G12 ′ is left and right. If not reversed, the enlargement process may be performed without performing the left-right reversal process on the mirror image G12 ′.

  In the present embodiment, the image processing unit 21 is described as being included in the video recording device 2, but the image processing unit 21 may be included in the camera 11, and the camera 11 and the video recording device 2. May be provided in another information processing apparatus.

As mentioned above, when this embodiment is outlined,
(1) The monitoring system of the present embodiment includes a photographing unit that photographs the inside of a railway vehicle, a mirror that is provided in a photographing region, reflects a range that is a blind spot of the photographing unit due to an obstacle, and a mirror image from the photographed image. Extracting, reversing the mirror image, and enlarging the image processing means, connected to the imaging means via a network, and recording the captured image and the mirror image processed by the image processing means It is characterized by comprising recording means, and display control means for reproducing and displaying the recorded photographed image and the mirror image in synchronism.
(2) Further, the display control means may display a vehicle layout diagram reflecting the photographing range of the photographing means and the photographing range of the mirror.
(3) A plurality of mirrors may be installed, and the image processing means may extract a mirror image from the mirror image.

  The present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention. Note that, in the above-described embodiment, the same reference numerals are given to configurations showing similar functions.

1: Vehicle 2: Video recording device 3: Video playback device 4: Network 11: Camera 12: Mirror 13: Obstacle 21: Image processing unit 22: Recording unit 31: Display control unit 32: Display unit G1: Vehicle layout diagram G11 : Captured image G12: Mirror image G12 ′ (after image processing): Mirror image X (before image processing): Monitoring system

Claims (1)

Photographing means for photographing inside the railway vehicle;
A mirror that is provided in the imaging region and reflects a range that becomes a blind spot of the imaging means due to an obstacle;
Image processing means for extracting a mirror image from the photographed image, inverting the mirror image, and enlarging the image;
A recording unit connected to the imaging unit via a network and recording the captured image and the mirror image processed by the image processing unit;
A monitoring system comprising: display control means for reproducing the recorded photographed image and the mirror image in synchronization.