Video Recording Device

Abstract

To prevent unnecessary video from being recorded continuously.SOLUTION: A video recording device functions as a first control unit and a second control unit. In a case where vibrations of a vehicle are detected by an acceleration sensor 16, the first control unit starts capturing video of the inside of the vehicle or the surroundings of the vehicle with a camera 28 and recording the captured video in a video recording region 44. The second control unit causes the video recording to be stopped in a case where an opening / closing signal of a door of the vehicle output from a door opening / closing sensor unit 20 within a prescribed time T1 after detection of vibrations of the vehicle with the acceleration sensor 16 is detected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a video recording device. [Background technology]

[0002] Patent Document 1 describes a technology in which a drive recorder stores captured images in a memory unit based on the results of comparing the output signal from an acceleration sensor with a judgment threshold, and changes the judgment threshold based on changes in a signal that detects the parking state of the vehicle, enabling the technology to detect small vibrations that could not be detected before the vehicle was parked. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-128610 A Summary of the Invention [Problem to be solved by the invention]

[0004] The technology described in Patent Document 1 detects vibrations caused by closing the door when getting in or out of the vehicle as vibrations when the vehicle is parked, and as a result, unnecessary footage is continuously recorded, which may result in footage that should be saved being overwritten and erased.

[0005] The present disclosure has been made in consideration of the above circumstances, and has an object to provide a video recording device that can prevent unnecessary video from being continuously recorded. [Means for solving the problem]

[0006] The video recording device of the first aspect includes a first control unit that starts recording video of the interior of the vehicle or the surroundings of the vehicle when vehicle vibration is detected, and a second control unit that stops the video recording when a door opening / closing signal of the vehicle is detected within a predetermined time after the vehicle vibration is detected.

[0007] In the first aspect, even if the vibration caused by the vehicle door closing is detected and the video recording is started by the video recording device before the vehicle door opening / closing signal is detected by the video recording device, the video recording is stopped at the point when the door opening / closing signal is detected by the video recording device. Therefore, according to the first aspect, it is possible to prevent unnecessary video from being continuously recorded. Effect of the Invention

[0008] The present disclosure has an effect of preventing unnecessary video from being continuously recorded. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing a schematic configuration of an in-vehicle system according to an embodiment; [Diagram 2] FIG. 2 is a functional block diagram of the video recording device. [Diagram 3] 4 is a flowchart showing a parking process executed by the video recording device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An example of an embodiment of the present disclosure will be described in detail below with reference to the drawings. Fig. 1 shows an in-vehicle system 10 according to this embodiment. In the in-vehicle system 10, an acceleration sensor unit 14, a door opening / closing sensor unit 20, a video recording device 30, and a car navigation device 50 are communicatively connected to a system bus 12 conforming to a standard such as CAN (Controller Area Network). In addition, a camera unit 26 is connected to the video recording device 30.

[0011] The acceleration sensor unit 14 includes an acceleration sensor 16 that detects the acceleration applied to the vehicle, and a communication unit 18 that periodically transmits the acceleration detection result (acceleration signal) by the acceleration sensor 16 to the video recording device 30 via the system bus 12. The acceleration sensor 16 also functions as a vibration sensor that detects vibrations of the vehicle.

[0012] The door opening / closing sensor unit 20 includes door opening / closing sensors 22 that are provided corresponding to the doors of the vehicle and detect the opening / closing of the doors of the vehicle, and a communication unit 24 that transmits the detection result of the door opening / closing by the door opening / closing sensor 22 (door opening / closing signal) to the video recording device 30 via the system bus 12 at regular intervals. In this embodiment, the transmission period of the door opening / closing signal from the door opening / closing sensor unit 20 is set longer than the transmission period of the acceleration signal from the acceleration sensor unit 14.

[0013] The camera unit 26 includes one or more cameras 28 capable of capturing images of the periphery of the vehicle (hereinafter referred to as the subject vehicle) in which the in-vehicle system 10 is mounted or the interior of the subject vehicle. The cameras 28 capture images of the periphery of the subject vehicle or the interior of the subject vehicle in response to an instruction from the video recording device 30. The camera unit 26 also transmits the images captured by the cameras 28 to the video recording device 30.

[0014] The video recording device (drive recorder) 30 includes a CPU (Central Processing Unit) 32 and a memory 34 such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The video recording device 30 also includes a non-volatile storage unit 36 ​​such as a HDD (Hard Disk Drive) or an SSD (Solid State Drive), and a communication unit 38 that controls communication with the car navigation device 50 of the in-vehicle system 10 and the like. The CPU 32, the memory 34, the storage unit 36, and the communication unit 38 are connected to each other via an internal bus 40 so as to be able to communicate with each other.

[0015] The storage unit 36 ​​has a video recording program 42 stored therein in advance, and is provided with a video recording area 44 for recording video captured by the camera 28. The video recording device 30 may be configured such that the video recording area 44 is provided in a non-volatile recording medium (such as a micro USB (Universal Serial Bus) card) that is detachable from the video recording device 30. The video recording device 30 functions as the first control unit 46 and the second control unit 48 shown in FIG. 2 by reading the video recording program 42 from the storage unit 36 ​​and expanding it in the memory 34, and executing the video recording program 42 expanded in the memory 34 by the CPU 32.

[0016] When the acceleration sensor 16 of the acceleration sensor unit 14 detects vibration of the vehicle, the first control unit 46 starts recording video of the interior of the vehicle or the surroundings of the vehicle using the camera 28 of the camera unit 26. When the second control unit 48 detects that the door opening / closing signal from the door opening / closing sensor unit 20 has changed from door open to door closed within a predetermined time after the acceleration sensor 16 of the acceleration sensor unit 14 detects vibration of the vehicle, the second control unit 48 stops recording video using the camera 28 of the camera unit 26.

[0017] The car navigation device 50 includes a display unit 52 capable of displaying images such as maps, an input unit 54 capable of inputting information, and a USB slot 56 into which a USB memory or the like can be inserted. The display unit 52 and the input unit 54 are used as devices that realize a UI (User Interface) of the video recording device 30, for example, when searching for videos recorded in the video recording area 44 of the video recording device 30 or when recording videos to a USB memory inserted in the USB slot 56.

[0018] Next, the operation of this embodiment will be described. When the ignition switch of the host vehicle is on, the video recording device 30 performs normal-time processing. In this normal-time processing, the video recording device 30 causes the camera 28 of the camera unit 26 to capture a video, and records the video captured by the camera 28 as an overwritable video in the video recording area 44.

[0019] Also, in the normal-time processing, each time the video recording device 30 receives an acceleration signal from the acceleration sensor 16 of the acceleration sensor unit 14, it determines whether or not the acceleration G represented by the received acceleration signal (the acceleration G detected by the acceleration sensor 16) is equal to or greater than a preset normal-time acceleration threshold value Gth1. When it is determined that the acceleration G is equal to or greater than the normal-time acceleration threshold value Gth1, the video recorded by the camera 28 of the camera unit 26 for a predetermined time is recorded as a non-overwritable video in the video recording area 44.

[0020] Note that in the normal-time processing, it is also possible to omit video recording during a period when the acceleration G is less than the normal-time acceleration threshold value Gth1.

[0021] Subsequently, with reference to FIG. 3, the parking-time processing executed by the video recording device 30 will be described, triggered by the ignition switch of the host vehicle being turned off and the host vehicle being parked.

[0022] In step 100 of the parking-time processing, the first control unit 46 waits until it receives an acceleration signal from the acceleration sensor unit 14, and determines whether or not the acceleration G represented by the acceleration signal received from the acceleration sensor unit 14 is equal to or greater than a preset acceleration threshold value Gth2. Note that the acceleration threshold value Gth2 may be Gth2 = Gth1 or Gth2 < Gth1. If the determination in step 100 is negative, the process proceeds to step 102.

[0023] In step 102, the first control unit 46 determines whether the ignition switch of the vehicle is turned on. If the determination in step 102 is negative, the process returns to step 100, and steps 100 and 102 are repeated until the determination in step 100 or step 102 is positive. Note that if the ignition switch of the vehicle is turned on and the determination in step 102 is positive, the parking process ends.

[0024] On the other hand, if the acceleration G represented by the acceleration signal received from the acceleration sensor unit 14 becomes equal to or greater than the acceleration threshold value Gth2 while the host vehicle is parked, the determination in step 100 is affirmative and the process proceeds to step 104. In step 104, the first control unit 46 causes the camera 28 of the camera unit 26 to capture an image, and also causes the image captured by the camera 28 to start recording in the image recording area 44, for example, as an image that cannot be overwritten.

[0025] In the next step 106, the second control unit 48 waits until it receives a door opening / closing signal from the door opening / closing sensor unit 20, and determines whether or not the door opening / closing signal received from the door opening / closing sensor unit 20 has detected a change from the door open to the door closed.

[0026] If the door opening / closing signal has changed from the door open state to the door closed state, the determination in step 106 is affirmative, and the process proceeds to step 108. In step 108, the second control unit 48 determines whether or not the time t from when the video recording is started in step 104 until when it is detected in step 106 that the door opening / closing signal has changed to the door closed state is equal to or shorter than a predetermined time T1 that has been set in advance. Note that the predetermined time T1 can be set to, for example, a time period corresponding to the transmission period of the door opening / closing signal from the door opening / closing sensor unit 20, specifically, a time period of about 900 ms.

[0027] If the time t is equal to or shorter than the predetermined time T1, it can be determined that the change in acceleration G that caused the determination in step 100 to be positive is due to the door of the vehicle being closed. For this reason, if the determination in step 108 is positive, the process proceeds to step 112, where the second control unit 48 ends the image capture by the camera 28 and the recording of the image in the image recording area 44. This makes it possible to prevent unnecessary images from being continuously recorded in the image recording area 44 due to the change in acceleration G (vibration) caused by the door of the vehicle being closed. When the process in step 112 ends, the process returns to step 100.

[0028] Furthermore, if the determination in step 106 is negative, or if the determination in step 108 is negative, it can be determined that the change in acceleration G that caused the determination in step 100 to be positive is not due to the door of the vehicle being closed, and the process proceeds to step 110. In step 110, the second control unit 48 determines whether the elapsed time from the start of video recording in step 104 is equal to or greater than a preset predetermined time T2. Note that the predetermined time T2 can be set to, for example, about 60 seconds.

[0029] If the determination in step 110 is negative, the process returns to step 106, and steps 106 and 110 are repeated until the determination in step 110 is positive. During this time, the camera 28 continues to capture images and the images are recorded in the image recording area 44.

[0030] Furthermore, if the time that has elapsed since the start of video recording in step 104 reaches or exceeds the predetermined time T2, the determination in step 110 becomes positive and the process proceeds to step 112. Then, as described above, in step 112, second control unit 48 ends the image capture by camera 28 and the image recording in video recording area 44, and the process returns to step 100.

[0031] As described above, in this embodiment, the video recording device 30 starts recording video of the interior of the vehicle or the surroundings of the vehicle when the first control unit 46 detects vehicle vibration. Also, when the second control unit 48 detects a vehicle door opening / closing signal within a predetermined time T1 after the vehicle vibration is detected, the video recording is stopped. This makes it possible to prevent unnecessary video from being continuously recorded.

[0032] In the above, the embodiment of detecting the vibration of the vehicle by determining whether the acceleration detected by the acceleration sensor 16 is equal to or greater than the acceleration threshold Gth2 has been described, but the present disclosure is not limited to this. For example, a dedicated vibration sensor for detecting the vibration of the vehicle may be provided, and the vibration detected by the vibration sensor may be compared with a threshold to detect the vibration of the vehicle.

[0033] 3, when the determination in step 108 is positive, video recording is terminated, but the present disclosure is not limited to this. For example, when the determination in step 108 is positive, video recording may be terminated and the video recorded from the start of video recording to the present may be erased. This can prevent the video recording area 44 from being overwhelmed with unnecessary video.

[0034] Further, although the above describes a configuration in which the video recording program 42 is pre-stored (installed) in the memory unit 36, the video recording program 42 can also be provided in a form in which it is recorded on a non-temporary recording medium such as an HDD, SSD, or DVD. [Explanation of symbols]

[0035] 10 In-vehicle systems 16 Acceleration Sensor 22 Door opening / closing sensor 28 Camera 30 Video Recording Device 46 First Control Section 48 Second Control Section

Claims

[Claim 1] A first control unit that starts recording video of an interior of the vehicle or a periphery of the vehicle when vibration of the vehicle is detected; a second control unit that stops the video recording when a door opening / closing signal of the vehicle is detected within a predetermined time after vibration of the vehicle is detected; A video recording device including:

Images