JP6485296B2 - Video recording device - Google Patents

Description

  The present invention relates to a video recording apparatus that is mounted on a vehicle and records a video imaged around the vehicle.

  2. Description of the Related Art Conventionally, there has been known a video recording apparatus that records data corresponding to a video around a vehicle photographed by a plurality of cameras mounted on the vehicle on a recording medium. Further, in such video recording, for example, a technique for suppressing the shortage of the capacity of the recording medium by performing the shooting and recording only when an obstacle is detected around the vehicle via a sonar. It has been proposed (see Patent Document 1).

  This patent document 1 also describes that when an obstacle is detected via a sonar, only the camera that captures the direction in which the obstacle is detected may be operated.

Japanese Patent Laying-Open No. 2015-88794

  However, in Patent Document 1, even when an obstacle is detected in a specific direction via a sonar, the recording mode for recording data corresponding to the captured video is just by starting shooting in that direction. It is set as a normal aspect. The recording mode is a recording mode when data corresponding to a video is recorded on a recording medium. For this reason, even when an obstacle as a moving object is detected in a specific direction, a process for controlling the recording mode and optimizing the amount of recording medium used when recording the data is not performed. There is a possibility that it is not possible to leave a detailed record of the movement of Accordingly, an object of the present invention is to provide a video recording apparatus that can appropriately record the movement of a moving object around a vehicle by appropriately adjusting the usage amount of the recording medium.

  The video recording apparatus (1) of the present invention includes an imaging unit (30F, 30R, 30L, 30B), a recording medium (35), a moving object detection unit (20FC, 20FR, 20FL, 20BC, 20BR, 20BL), A direction determination unit (2) and a recording control unit (33) are provided.

  The imaging unit performs imaging in a plurality of directions around the vehicle. On the recording medium, data corresponding to the video imaged by the imaging unit in each direction is recorded in time series. On the other hand, the moving object detection unit detects a moving object that moves relative to the vehicle. The direction determining unit determines which one of the plurality of directions is closer to the moving object detected by the moving object detecting unit.

  When the moving object detection unit detects a moving object and the direction determination unit performs the determination, the recording control unit records the data related to the direction determined by the direction determination unit as the existence position is close. The recording mode of the data with respect to the recording medium is controlled so that the amount of the recording medium to be used is larger than when the moving object detection unit does not detect the moving object.

  For this reason, when the moving object is detected in a specific direction, the recording mode is changed, and the amount of recording medium used for recording the data in the direction is not detected. Larger than Therefore, the movement of the moving object around the vehicle can be recorded as a good record.

  In addition, the code | symbol in the parenthesis described in this column and a claim shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The technical scope of this invention is shown. It is not limited.

It is a block diagram which shows the structure of the video recording device of 1st Embodiment. It is a figure which shows notionally the sonar installation position and detection range of the video recording apparatus. It is a figure which shows notionally the camera installation position and imaging | photography range of the video recording device. It is a flowchart which shows the video recording process in the video recording device. It is explanatory drawing which shows notionally the video recording aspect at the normal time by the process. It is explanatory drawing which shows notionally the video recording aspect at the time of the moving object detection by the process. It is explanatory drawing which shows notionally the video recording aspect at the normal time by the video recording device of 2nd Embodiment.

Embodiments to which the present invention is applied will be described below with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
A video recording apparatus 1 shown in FIG. 1 includes a periphery monitoring unit 2 and a video recording unit 3. The surrounding monitoring unit 2 is connected with six sonars 20FC, 20FR, 20FL, 20BC, 20BR, and 20BL (hereinafter also referred to simply as sonar 20 when it is not necessary to distinguish). Yes.

  As shown in FIG. 2, the six sonars 20 are provided at the front end of the vehicle C on which the video recording apparatus 1 is mounted, and three at the rear end of the vehicle C, respectively. More specifically, a sonar 20FC is provided at the front end portion of the vehicle C at the center of the front end surface of the vehicle C. A sonar 20FR is provided at the front end portion of the right side surface of the vehicle C. A sonar 20FL is provided at the front end portion of the left side surface of the vehicle C. A sonar 20BC is provided at the center of the rear end surface of the vehicle C. A sonar 20BR is provided at the rear end of the right side surface of the vehicle C. A sonar 20BL is provided at the rear end of the left side surface of the vehicle C.

  In FIG. 2, the detection range by each sonar 20 is conceptually shown by three arcs having a common center and angle and different radii. As shown in FIG. 2, the detection range of the sonar 20FC covers the vehicle width range on the front side of the vehicle C. The detection range of the sonar 20FR covers the vehicle front side portion on the right side of the vehicle C. The detection range of the sonar 20FL covers the vehicle front side portion on the left side of the vehicle C. The detection range of the sonar 20BC covers the vehicle width range on the rear side of the vehicle C. The detection range of the sonar 20BR covers a vehicle rear side portion on the right side of the vehicle C. The detection range of the sonar 20BL covers the vehicle rear side portion on the left side of the vehicle C.

  Returning to FIG. 1, the periphery monitoring unit 2 is configured as a microcomputer including a CPU, a ROM, and a RAM. When the surrounding monitoring unit 2 detects the presence or absence of a moving object (for example, a person, an obstacle, etc.) that moves relative to the vehicle C based on signals from the six sonars 20 and a moving object is detected. Is determined as to which direction of the moving object is close to the vehicle C in the front-rear and left-right directions (an example of a plurality of directions). These detection results and determination results are output to the video recording unit 3 as electrical signals.

  Connected to the video recording unit 3 are four cameras 30F, 30R, 30L, and 30B (hereinafter also simply referred to as cameras 30 when it is not necessary to distinguish them). The four cameras 30 are provided on the front, rear, left and right of the vehicle C as shown in FIG. More specifically, the camera 30F has a shooting range in front of the periphery of the vehicle C, the camera 30R has a shooting range in the right side around the vehicle C, the camera 30L has a shooting range in the left side around the vehicle C, and the camera 30B has a shooting range in the vehicle C. The rear of the periphery is the shooting range. In order to enable shooting in these shooting ranges, for example, the camera 30F may be provided on the rear surface of the rearview mirror, or may be provided at other vehicle front positions. The cameras 30R and 30L may be provided under the left and right side mirrors and under the auxiliary winkers of the side doors, or may be provided at other vehicle side positions. The camera 30B may be provided inside the rear window, or may be provided at another vehicle rear position.

  Returning to FIG. 1, the video recording unit 3 includes input buffers 31F, 31R, 31L, and 31B, a recorded video generation unit 33, a frame buffer 34, and a recording medium 35. The recording medium 35 is configured by a known recording medium such as a flash memory, a hard disk, a RAM, and a video RAM.

  Data sent from the four cameras 30F, 30R, 30L, and 30B is input to the recorded video generation unit 33 via the input buffers 31F, 31R, 31L, and 31B. The recorded video generation unit 33 is configured as a microcomputer including a CPU, a ROM, and a RAM, and records data corresponding to videos captured by the four cameras 30 in the frame buffer 34. Then, the data recorded in the frame buffer 34 is recorded on the recording medium 35 in the same manner. More specifically, the recorded video generation unit 33 converts the data sent from each of the cameras 30F, 30R, 30L, and 30B to a digital that conforms to the standards of the frames F1, F2,. Converted to data and recorded in each frame F1, F2,. The data of each frame F1, F2,... In the frame buffer 34 is recorded in the same manner on the frame provided in the recording medium 35. This recording mode will be described in detail later. In addition, the recorded video generation unit 33 receives the electrical signal (that is, the detection result and the determination result) indicating the presence and direction of the moving object described above from the periphery monitoring unit 2.

[1-2. processing]
Next, video recording processing executed by the recorded video generation unit 33 will be described with reference to the flowchart of FIG. This process is similarly executed by the CPU of the recorded video generation unit 33 based on a program stored in the ROM of the recorded video generation unit 33 when the vehicle C is powered on. This process is continuously executed regardless of whether the vehicle C is stopped or traveling.

  As shown in FIG. 4, when the process is started, first, in S1 (S represents a step: the same applies below), the detection result of the presence or absence of a moving object and the movement when a moving object is detected The direction in which the presence position of the object is determined to be close (that is, the direction in which the moving object is detected) is received from the periphery monitoring unit 2. In subsequent S2, it is determined whether or not the received detection result indicates that a moving object has been detected.

  If the detection result indicates that no moving object is detected (S2: N), the process proceeds to S3. In S3, the video of each direction is recorded with the frames F1, F2,... Equally allocated as follows, and the process proceeds to S1 described above.

  In S3, as shown in FIG. 5, the shooting data in the front, rear, left, and right directions shot through the cameras 30F, 30B, 30L, and 30R are cyclically assigned in a predetermined order. Recorded in a robin format.

  In the example of FIG. 5, shooting data in front of the vehicle C shot by the camera 30F is recorded in the first frame F1. Hereinafter, this data is also referred to as shooting data of the previous camera. In the next frame F2, photographing data on the right side of the vehicle C photographed by the camera 30R is recorded. Hereinafter, this data is also referred to as right camera shooting data. In the next frame F3, photographing data on the left side of the vehicle C photographed by the camera 30L is recorded. Hereinafter, this data is also referred to as left camera shooting data. In the next frame F4, shooting data behind the vehicle C shot by the camera 30B is recorded. Hereinafter, this data is also referred to as rear camera shooting data. Similarly, the respective data are cyclically recorded after the frame F5 in the order of the shooting data of the previous camera, the shooting data of the right camera, and so on. An arrow T shown in FIG. 5 conceptually shows the time axis. The meaning of the arrow T is the same in FIGS.

  Returning to FIG. 4, if the detection result received in S1 indicates that a moving object has been detected (S2: Y), the process proceeds to S4. In S4, the video in the direction in which the moving object is detected is recorded using all the frames F1, F2,..., And the process proceeds to S1 described above. For example, when the moving object is detected in the forward direction, as illustrated in FIG. 6, the shooting data of the front camera is recorded in all the frames F1, F2,.

[1-3. effect]
According to the first embodiment described in detail above, the following effects can be obtained.
(1A) In the video recording apparatus 1 of the first embodiment, when a moving object is detected (S2: Y), the recording mode (S3) by the round robin method is changed, and the moving object is detected. The shooting data is recorded using all the frames F1, F2,... (S4). For this reason, the movement of the moving object around the vehicle C can be favorably recorded at a high frame rate and at a high resolution. Although the moving object may cause harm to the vehicle C, the movement of such a moving object can be well recorded as a record.

  (1B) In the video recording apparatus 1 of the first embodiment, when no moving object is detected (S2: N), the shooting data in each of the front, rear, left and right directions cyclically assigns the frames F1, F2,. Recording is performed by the round robin method (S3). For this reason, even when a moving object is not detected (S2: N), the video image | photographed with respect to each direction can be recorded with high resolution.

  (1C) In the video recording apparatus 1 according to the first embodiment, when no moving object is detected (S2: N), the frames F1, F2,. (S3). For this reason, when a moving object is not detected (S2: N), the video image | photographed with respect to each direction can be recorded equally.

  (1D) In the video recording apparatus 1 of the first embodiment, the cameras 30 are individually provided in the front, rear, left and right directions, and shooting is performed in the corresponding directions. For this reason, it is not necessary to change the direction of the camera 30 with respect to the vehicle C, and the configuration of the apparatus can be simplified.

In the first embodiment, the cameras 30F, 30R, 30L, and 30B are the imaging unit, the sonars 20FC, 20FR, 20FL, 20BC, 20BR, and 20BL are the moving object detection unit, and the periphery monitoring unit 2 is the direction determination unit. The recording video generation unit 33 corresponds to a recording control unit.
[2. Second Embodiment]
[2-1. Difference from the first embodiment]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, the description of the common configuration will be omitted, and the description will focus on the differences. In the second embodiment, the configuration of the apparatus is the same as that of the first embodiment, and the process in S3, that is, the process of equally allocating the frames F1, F2,. It has been changed as follows.

  In S3 of this embodiment, as shown in FIG. 7, each of the frames F1, F2,... Is equally divided into four, and the captured data of the previous camera, the captured data of the right camera, and the Recording is performed by an image division method that records shooting data and shooting data of the rear camera. In S4, the entire area of each frame F1, F2,... Is used to record the shooting data in the direction in which the moving object is detected. As a result, the same as S4 in the first embodiment shown in FIG. Recording mode.

[2-2. effect]
According to the second embodiment described above in detail, in addition to the effects (1A), (1C), and (1D) of the first embodiment described above, the following effects can be obtained.

  (2A) In the video recording apparatus 1 of the second embodiment, when a moving object is not detected (S2: N), each frame F1, F2,... Recording is performed by an image division method in which data is assigned to each divided area. For this reason, the video image | photographed with respect to each direction can be recorded at a high frame rate, and it can suppress that a decisive moment is missed.

  In addition, in the video recording apparatus 1 of the second embodiment, the cameras 30 are individually provided in the front, rear, left, and right directions, and shooting is performed in the corresponding directions. For this reason, compared with the case where the scan which changes the direction of the camera 30 with respect to the vehicle C is made, it can suppress more favorably that a decisive moment is overlooked.

[3. Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention can take a various form, without being limited to the said embodiment.

  (3A) In each of the above embodiments, a total of four cameras, one for each of the front, rear, left, and right, are used. However, the present invention is not limited to this. For example, the number of cameras may be two in total, one at the front and back, or two at the left and right, or five or more (for example, six according to the position of each sonar 20). . Similarly, the number of sonars 20 can be variously changed. Further, the arrangement of the camera 30 or the sonar 20 can be changed variously.

  (3B) In the first embodiment, when a moving object is detected (S2: Y), shooting data in the direction in which the moving object is detected is recorded using all the frames F1, F2,. It is not limited to this. For example, when a moving object is detected in front, the recording form using the frames F1, F2,... In the order of front, right, left, rear,. For example, the frequency of recording the shooting data in the direction in which the moving object is detected may be increased.

  (3C) In the second embodiment, when a moving object is detected (S2: Y), shooting data in the direction in which the moving object is detected is recorded using the entire area of each frame F1, F2,. However, the present invention is not limited to this. For example, when a moving object is detected in the front, the area where the shooting data of the previous camera is recorded is 70% of the entire frame F, and the area where the shooting data related to other directions is recorded is 10% of the entire frame F, respectively. For example, the area in which shooting data in the direction in which the moving object is detected is recorded may be increased.

  (3D) In the first embodiment, when a moving object is not detected (S2: N), the order of front, right, left, rear,... Although set, the present invention is not limited to this. The predetermined order may be arbitrary as long as it is a preset order, and can be changed as appropriate. In addition, the predetermined order is an order that increases the frequency of recording the shooting data in a specific direction (in this example, front), such as front, right, front, back, front, left, front, right, and so on. This may be set even when a moving object is not detected. In this case, for example, when a moving object is detected in the forward direction (S2: Y), all frames F1, F2,..., Such as front, front, front, front,. The frequency at which the frames F1, F2,... Are used for recording the shooting data in the forward direction, such as front, front, right, front, front, back, front, front, left,. It is conceivable to change the recording form such as further increasing. Furthermore, as described above, when the order in which the shooting data related to a specific direction (previous in the above example) is recorded is set when a moving object is not detected, the direction other than the specific direction is set. When a moving object is detected (right, left, and rear in the above example), an order may be set in which the frequency at which shooting data relating to the direction is recorded is increased to the same extent as the specific direction.

  (3E) In the second embodiment, when a moving object is not detected (S2: N), the predetermined ratio at which the frames F1, F2,... Are divided is 25%: 25%: 25%: 25%. However, the present invention is not limited to this. The predetermined ratio is arbitrary as long as it is a preset ratio, and can be changed as appropriate. For example, the ratio of the area in which shooting data in a specific direction (front in this example) is recorded is increased such that the ratio of front: right: left: back is 40%: 20%: 20%: 20%. The recording mode may be set even when a moving object is not detected. In this case, for example, when a moving object is detected in the forward direction (S2: Y), the entire area of the frames F1, F2,... Is used for recording the shooting data in the forward direction, or the front: right: Left: The recording format can be changed, for example, by further increasing the ratio of the area used for recording the shooting data in the forward direction, such as 70%: 10%: 10%: 10%. Furthermore, as described above, when the recording mode in which the ratio of the area in which the shooting data relating to the specific direction (the previous example) is recorded is set when the moving object is not detected, the specific direction When a moving object is detected in a direction other than (right, left, and rear in the above example), a recording mode is set in which the ratio of the area in which shooting data relating to the direction is recorded is increased to the same extent as the specific direction. May be.

  (3F) The round robin method as in the first embodiment and the screen division method as in the second embodiment may be used in combination. For example, when a moving object is not detected (S2: N), the frames F1, F2,... Are used in a round-robin manner in the order of front, right and left, rear,. F may be divided into two, and the shooting data on the right side and the shooting data on the left side may be recorded in one frame F.

  (3G) In each of the embodiments described above, the usage amount (that is, the number of frames or the size of the divided area) of the recording medium 35 used for recording the shooting data from any one of the cameras 30 is increased. However, the present invention is not limited to this. For example, when the shooting range of one camera 30 can be further subdivided, the usage amount of the recording medium 35 used for recording shooting data relating to a specific shooting range of the specific camera 30 is increased. It is possible to change the recording mode. In this case, for example, when a pedestrian is detected in the vicinity of the vehicle C, it is possible to record the shooting data relating to the shooting range including the pedestrian at a high frame rate and with a high resolution. .

  (3H) In each of the above embodiments, the sonar 20 is used as the moving object detection unit, but the present invention is not limited to this. The moving object detection unit may be a proximity sensor other than sonar, and the camera 30 may operate as a proximity sensor.

  (3I) In each of the above embodiments, the direction in which each camera 30 captures is fixed with respect to the vehicle C, but is not limited to this. For example, two cameras 30 are provided at the right front end and the left rear end of the vehicle C, respectively, and are rotated so that the front and right sides of the vehicle C can be viewed with the former camera 30 and the vehicle with the latter camera 30. The rear and left sides may be taken. Furthermore, an omnidirectional camera or the like can also be used as the photographing unit, and in that case, the entire circumference of the vehicle C may be photographed by one omnidirectional camera. Even in such a case, the same effect as in each of the above-described embodiments can be obtained by controlling the usage amount of the recording medium 35 as in each of the above-described embodiments.

  (3J) In each of the above embodiments, the recording on the recording medium 35 is performed as the frames F1, F2,... Via the frame buffer 34, but the present invention is not limited to this. The recording medium may be any recording medium as long as data corresponding to the captured video is recorded in time series. For example, various recording media such as a recording medium having no frame can be used.

  (3K) In each of the embodiments described above, the photographing unit, the recording medium, the moving object detection unit, the direction determination unit, and the recording control unit are all mounted on the vehicle C, but the present invention is not limited to this. For example, the data recorded in the frame buffer 34 may be transmitted and recorded to a computer provided outside the vehicle C via a communication line such as the Internet. In that case, the memory of the computer corresponds to a recording medium.

  (3L) The functions of one component in the embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified only by the wording described in the claim are embodiment of this invention.

  (3M) In addition to the above-described video recording apparatus, various modes such as a system including the video recording apparatus as a constituent element, a program for causing a computer to function as the video recording apparatus, a medium on which the program is recorded, and a video recording method Thus, the present invention can be realized.

DESCRIPTION OF SYMBOLS 1 ... Video recording apparatus 2 ... Perimeter monitoring part 3 ... Video recording part 20BC, 20BL, 20BR, 20FC, 20FL, 20FR ... Sonar 30B, 30F, 30L, 30R ... Camera 33 ... Recorded video production | generation part 34 ... Frame buffer 35 ... Recording Medium C ... Vehicles F1, F2, F3, F4, F5 ... Frame

Claims (3)

A video recording device (1) for recording video taken around the vehicle (C),
An imaging unit (30F, 30R, 30L, 30B) that performs imaging in a plurality of directions around the vehicle;
A recording medium (35) on which data corresponding to the video imaged by the imaging unit in each direction is recorded in time series;
A moving object detector (20FC, 20FR, 20FL, 20BC, 20BR, 20BL) that detects a moving object that moves relative to the vehicle;
A direction determination unit (2) for determining which one of the plurality of directions is close to the moving object detected by the moving object detection unit;
When the moving object detection unit detects a moving object and the direction determination unit makes the determination, the recording for recording the data related to the direction determined by the direction determination unit as the existence position is near A recording control unit (33) for controlling the recording mode of the data with respect to the recording medium so that the amount of medium used is larger than when the moving object detection unit does not detect the moving object;
Equipped with a,
In the recording medium, the data is sequentially recorded in a plurality of frames (F1, F2, F3, F4, F5) in time series .
When the moving object detection unit has not detected a moving object, the recording control unit cyclically assigns the frames in a predetermined order in order to record data in each direction, and the moving object detection unit When the moving object is detected and the direction determination unit makes the determination, the data allocated to record the data related to another direction is recorded to record the data related to the determined direction. A video recording apparatus characterized in that a part of a frame is directed in units of frames, and at least one of the cyclically assigned frames is left as a frame for recording data in each of the other directions. . The recording control unit, the moving object detection unit may not detect the moving object is characterized by uniformly and assign the amount of the recording medium for recording data according to the each direction The video recording apparatus according to claim 1. The imaging unit is provided individually for the plurality of directions, a video recording apparatus according to claim 1 or 2, characterized in that to perform photographing with respect to a direction corresponding to each.

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