Imaging device, control method for imaging device, and control program for imaging device

Abstract

To provide an imaging device that can reduce unnecessary event recording when a vehicle is in motion.SOLUTION: An image capturing unit 10 captures images of the interior or exterior of a vehicle to generate image data 31, and a vibration detection unit 20 detects vibrations of the vehicle. A threshold setting unit 41 sets a threshold value to determine whether or not an event has occurred for which the image data 31 should be saved, based on the detected vibration of the vehicle. A location information acquisition unit acquires location information of the vehicle V, and an information recording unit records the maximum value of the detected vibration of the vehicle V in association with the location information of the vehicle V. A determination unit determines whether or not the vehicle V travels on a road that the vehicle V has traveled on in the past based on the current location information of the vehicle V and the previously recorded location information. When determining that the vehicle V travels on a road that the vehicle has traveled in the past, the threshold setting unit 41 sets a threshold value based on the maximum detected value of vibration of the vehicle V recorded when the vehicle V traveled on that road in the past.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an imaging device, a control method for the imaging device, and a control program for the imaging device.

Background Art

[0002] In Patent Document 1, when it is determined that the vehicle is parked, based on at least one of the video around the vehicle, illuminance information and sound information, a drive recorder that controls a threshold value for determining whether the detected shake of the vehicle is abnormal is described.

Prior Art Documents

Patent Documents

[0003] <00000​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

[0006] The present invention comprises an imaging unit that captures images of the interior or exterior of a vehicle and generates image data, and the vehicle A vibration detection unit that detects vibrations of the vehicle, and based on the vibration detection value of the vehicle detected by the vibration detection unit Therefore, a threshold is set to determine whether or not an event has occurred in which the aforementioned image data should be saved. A threshold setting unit for setting the threshold, a location information acquisition unit for acquiring the location information of the vehicle, and the vibration detection unit. The maximum value of the vibration detected by the unit and the vehicle's position information are associated and recorded. The information recording unit records information based on the vehicle's current location information and previously recorded location information. The system includes a determination unit that determines whether or not the vehicle is traveling on a road it has traveled on in the past, and The threshold setting unit is used when the determination unit determines that the vehicle is traveling on a road it has traveled on in the past. This is based on the maximum value of the vibration detection value of the vehicle recorded when it previously traveled on the aforementioned road. The present invention provides an imaging device for setting the threshold. [Effects of the Invention]

[0007] According to the imaging device, the control method for the imaging device, and the control program for the imaging device according to the present invention, This can reduce the recording of unnecessary events while the vehicle is in motion. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a block diagram showing an example configuration of an imaging device according to the first embodiment of the present invention. [Figure 2] Figure 2 shows an example of a road on which a vehicle equipped with an imaging device travels. [Figure 3] Figure 3 is a diagram illustrating the function of an imaging device according to the first embodiment of the present invention. [Figure 4]FIG. 4 is a flowchart for explaining an example of processing executed by the CPU included in the imaging device according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a block diagram showing a configuration example of the imaging device according to the second embodiment of the present invention. [Figure 6] FIG. 6 is a diagram for explaining the functions of the imaging device according to the second embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart for explaining an example of processing executed by the CPU included in the imaging device according to the second embodiment of the present invention. [Embodiments for Carrying Out the Invention]

[0009] Hereinafter, the imaging device, the control method of the imaging device, and the control program of the imaging device according to each embodiment will be described with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are assigned to the same parts and the description thereof will be omitted. In the description of the drawings, the same reference numerals are assigned to the same parts and the description thereof will be omitted. The description thereof will be omitted.

[0010] [First Embodiment] [Configuration Example of Imaging Device] Referring to FIG. 1, a configuration example of the imaging device 1 according to the first embodiment will be described. The imaging device 1 is mounted on the vehicle V shown in FIG. 2 and records image data 31 indicating the driving status of the vehicle V. The imaging device 1 is, for example, attached to the back of the rearview mirror of the vehicle V. The imaging device 1 is, for example, a so-called drive recorder, and as shown in FIG. |, includes an imaging unit 10, an acceleration sensor 20, an internal memory 30, a CPU (Central Processing Unit) 40, and a recording medium |50. At least the CPU 40 and the internal memory 30 may be configured by a microcomputer. The imaging device 1 is mounted on the vehicle V shown in FIG. 2 and records image data 31 indicating the driving status of the vehicle V. The imaging device 1 is, for example, attached to the back of the rearview mirror of the vehicle V, and is, for example, a so-called drive recorder. As shown in FIG. 1, the imaging device 1 includes an imaging unit 10, an acceleration sensor 20, an internal memory 30, a CPU (Central Processing Unit) 40, and a recording medium 50. The imaging device 1 is, for example, attached to the back of the rearview mirror of the vehicle V. The imaging device 1 is, for example, a so-called drive recorder, and as shown in FIG. 1, includes an imaging unit 10, an acceleration sensor 20, an internal memory 30, a CPU (Central Processing Unit) 40, and a recording medium 50. and an internal memory 30, a CPU (Central Processing Unit) 40, and a recording medium 50. [[ID=3i]] and a recording medium 50. At least the CPU 40 and the internal memory 30 may be configured by a microcomputer. The imaging unit 10 captures an image inside or outside the vehicle V and generates image data 31. The imaging unit

[0011] The imaging unit 10 captures an image inside or outside the vehicle V and generates image data 31. 10 includes, for example, a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semicon ductor) image sensor or the like. The imaging unit 10 is disposed at a position that images at least the traveling direction ( front) of the vehicle V. The image data 31 is generated in a format conforming to an arbitrarily set method. For example, the image data 31 may be data compressed by a compression method such as H.264 (MPEG-4 AV C) or H.265 (HEVC). Note that MPEG-4 AVC is an abbreviation of Moving Picture Experts Ge oup Advanced Video Coding, and HEVC is an abbreviation of Hig h Efficiency Video Codec. Also, the recording format of the image data 31 may be any of MP4, MOV, or AVI (Audio Video Interle ave) or the like. The compression method and recording format of the image data 31 are not limited to this.

[0012] The acceleration sensor 20 is, for example, a three-axis acceleration sensor that detects accelerations in the three-axis directions of the x-axis, y-axis, and z-axis, and is mounted at an arbitrary position of the imaging device 1. The acceleration sensor 20 functions as a vibration detection unit that detects the vibration of the vehicle V. In a general configuration of the acceleration sensor 20, a weight (plumb, mass) of a movable part vibrates due to acceleration, and the movable part is displaced by the balance with the reaction force of a spring that supports the weight. The displacement of the movable part is converted into an electrical signal by a displacement detection unit attached to the weight or a strain detection unit that detects the strain of the spring, and is signal-processed and output by a peripheral electronic circuit. The main peripheral electronic circuit amplifies the signal detected by the detection mechanism and the like, and the reaction force of the spring and the balance of the weight cause the movable part to displace. The displacement of the movable part is converted into an electrical signal by a displacement detection unit attached to the weight or a strain detection unit that detects the strain of the spring, and is signal-processed and output by a peripheral electronic circuit. The main peripheral electronic circuit amplifies the signal detected by the detection mechanism unit or a strain detection unit that detects the strain of the spring, and is converted into an electrical signal and signal-processed and output by a peripheral electronic circuit. The main peripheral electronic circuit amplifies the signal detected by the detection mechanism A signal conversion section that performs operations such as analog-to-digital conversion, and an output section that outputs the converted signal. And so on.

[0013] The acceleration sensor 20 detects the acceleration applied to the acceleration sensor 20, and the detected acceleration The acceleration sensor 20 outputs the positive and negative detected values ​​of the vibration of the vehicle V accordingly. It is connected to U40 and outputs the positive and negative detected values ​​of the vehicle V's vibration to CPU40. Note that the acceleration sensor 20 can be replaced with a 1-axis or 2-axis acceleration sensor instead of a 3-axis acceleration sensor. It's okay to have it.

[0014] Internal memory 30 consists of ROM (Read Only Memory) and RAM (Random It consists of ROM (Access Memory), etc. ROM is executed by CPU 40. It is used as a storage area for control programs (not shown) and the like. RAM is used by the CPU4 In addition to being used as a work area 0, the image data 31 is used for a predetermined amount of time (several seconds to several minutes). It is also used as a buffer area for temporary storage.

[0015] The CPU 40 operates according to the control program stored in the internal memory 30, and the imaging device The CPU 40 controls all parts of unit 1. The control program stored in the internal memory 30 By reading and executing RAM, the following functions are implemented.

[0016] The recording medium 50 is, for example, a memory card, and the image data captured by the imaging unit 10 is stored in it. 31 is a flash memory capable of recording data. The recording medium 50 is, for example, an imaging device. It is used by being inserted into a slot provided in the device 1, and is designed to be removable from the imaging device 1. The recording medium 50 is a non-volatile memory such as flash memory built into the imaging device 1. It may also be memory. The recording medium 50 is a magnetic storage device such as a hard disk drive. It may be configured as follows: The event storage area (not shown) of the recording medium 50 is located on the recording medium 50. This is a memory area where writing is prohibited, and the recording control unit 44 has determined that an event has occurred. The image data 31 for the predetermined period is transferred from the internal memory 30 and becomes image data 51. It will be recorded.

[0017] Next, the recording operation of the imaging device shown in Figure 1 will be explained. The image data 31 is recorded cyclically within the recording area of ​​the internal memory 30. Image data 31 is recorded sequentially starting from the first logical address (or physical address) within Mori 30. This process continues until the last logical address (or physical address) is recorded, and then the first one is recorded again. The recording start position returns to the logical address (or physical address), and the image data 31 remains as is. It gets overwritten.

[0018] While this cyclical recording method is being executed, the accelerometer 20 detects If the value exceeds a predetermined threshold, the CPU 40 will detect the occurrence of an event. The event that the imaging device 1 wants to detect as an event is a sudden acceleration while the vehicle V is in motion. It is considered highly likely that the incident was caused by sudden braking, sudden steering, a vehicle accident, or a collision. This is an event.

[0019] Image data 31 for a predetermined period before and after the time the event was detected is processed by CPU 4 Based on the control of 0, it is transferred to the recording medium 50. This transfer prevents overwriting. Image data 51 before and after the event will be recorded on the recording medium 50. The system records image data 31 for a predetermined period before and after the time the event was detected. This is sometimes referred to as an "event record."

[0020] Next, we will explain the functions of the CPU 40 of the imaging device 1. The CPU 40 has the following functions: As an example of a configuration, it includes a threshold setting unit 41, an information acquisition unit 42, an event detection unit 43, and a recording unit. It comprises a control unit 44 and a threshold update unit 45.

[0021] The threshold setting unit 41 sets the positive and negative detected values ​​of the vibration of the vehicle V detected by the acceleration sensor 20. Based on this, a correct decision is made to determine whether or not an event occurred that warrants saving the image data 31. The thresholds for the positive and negative sides are set. The threshold setting unit 41 sets the positive side when the vehicle V starts moving. A preset initial threshold is set as the threshold for the positive and negative sides. The threshold setting unit 41 will be described later. When the positive and negative thresholds are updated by the threshold update unit 45, the updated positive and The negative threshold is used as the positive and negative thresholds for determining whether or not an event has occurred. The threshold setting unit 41 is configured when the vehicle V has finished driving and the power to the imaging device 1 is turned off. When this happens, the positive and negative thresholds are reset to their initial values.

[0022] The information acquisition unit 42 uses the positive and negative sides of the vibration of the vehicle V detected by the acceleration sensor 20. Obtain the detected value.

[0023] The event detection unit 43 uses the positive and negative sides of the vibration of the vehicle V acquired from the acceleration sensor 20. The detected value is compared with the positive and negative thresholds set by the threshold setting unit 41. Then, it detects the occurrence of an event. More specifically, the event detection unit 43 detects the acquired vehicle If the detected vibration value of V is on the positive side, then check whether the detected vibration value of vehicle V is greater than the positive threshold. This is determined. If it is determined that the positive side detection value of the vibration of vehicle V is greater than the positive side threshold, In addition, if the detected vibration value of the acquired vehicle V is on the negative side, Then, it is determined whether the detected vibration value of vehicle V is smaller than the negative threshold. An event is detected when the negative detection value of the dynamic is smaller than the negative threshold.

[0024] Furthermore, when the event detection unit 43 detects an event, it records the time the event occurred. The time the event occurred is obtained from location sensors such as GNSS. It may also utilize time information, and may be a real-time clock connected to the CPU40. It is also acceptable to use local date and time information generated from somewhere. SS stands for Global Navifation Satellite System: All GNSS is an abbreviation for "Global Navigation Satellite System," which uses GNSS receivers to receive radio waves from multiple artificial satellites. By receiving this signal, the vehicle's position on the ground is detected.

[0025] The recording control unit 44, when the event detection unit 43 detects the occurrence of an event, Image data 31 of a predetermined period before and after the occurrence of an event, including the time the event occurred, is stored on a recording medium. The data is recorded in the body 50. The recording control unit 44 records the data for a predetermined period before and after the time the event occurred. Image data 31 generated by the imaging unit 10 and recorded in the internal memory 30 is stored in the internal memory The data is transferred from 30 to recording medium 50 and recorded as image data 51. An event occurs. The predetermined period before and after the time is, for example, a period of a few seconds to tens of seconds before and after the time the event occurred. It may be set to a certain period, or to a longer period.

[0026] The threshold update unit 45 updates the threshold for each unit section which is a predetermined time or distance traveled by the vehicle V. The positive and negative detected values ​​of vehicle V vibration, excluding detected values ​​that exceed the positive or negative threshold. The maximum value is determined. The threshold update unit 45 uses the maximum values ​​of the determined positive and negative detected values ​​to determine the value. Then, the positive and negative thresholds to be used in the next unit interval are calculated and set by the threshold setting unit 41. The positive and negative thresholds are updated. The interval may be set to, for example, 30 seconds, and the predetermined distance traveled by vehicle V is, for example, 1 It may be set to km. The method of setting the unit interval is not particularly limited.

[0027] The threshold update unit 45 determines whether the vehicle V has traveled a unit section of a predetermined time or distance. It determines whether or not. The threshold update unit 45 sets the unit interval to a predetermined distance, for example, The distance may be calculated by detecting changes in the position information of vehicle V, for example, by acquiring a vehicle speed pulse. Distance can be calculated. Methods for calculating distance using changes in location information and vehicle speed pulses are known technologies. Therefore, a detailed explanation will be omitted. The threshold update unit 45 determines when vehicle V has traveled a unit section. If a determination is made, the detected values ​​that exceed the positive or negative threshold within the unit section traveled are excluded. The maximum values ​​of the positive and negative vibrations of the vehicle V within a unit interval are determined. The threshold update unit 45 If no detection values ​​exceeding the positive or negative threshold are found within the unit section traveled, then... Determine the maximum values ​​of the positive and negative vibrations of vehicle V within the specified interval.

[0028] The threshold update unit 45 sets the maximum value of the positive and negative detected values ​​of the vibration of the vehicle V within the determined unit interval. Multiply by a predetermined multiple to calculate the positive and negative threshold values ​​to be used in the next unit interval. The update unit 45, for example, sets the maximum value of the positive and negative detected values ​​of the vibration of the vehicle V within a unit interval. Multiply by the predetermined multiple "3" to calculate the positive and negative threshold values ​​to be used in the next unit interval. Then, the positive and negative thresholds set by the threshold setting unit 41 are used to calculate the positive and negative thresholds. The threshold is updated to the negative side. Note that the predetermined multiple may be, for example, "2", and is not particularly limited. do not have.

[0029] Next, referring to Figures 2 and 3, we will examine the threshold setting unit 41, the event detection unit 43, and the recording control unit. 44. An example of the operation of the threshold update unit 45 will be described.

[0030] In Figure 2, vehicle V, equipped with imaging device 1, is traveling on a road with one lane in each direction. Vehicle V starts traveling from point A, and the unit section is a predetermined distance from point A to point B. Vehicle V travels through section D1. After traveling through the unit section D1, vehicle V travels a predetermined distance from point B to point C. Vehicle V travels through a unit section D2. After traveling through unit section D2, vehicle V travels from point C to point D Vehicle V travels a predetermined distance of unit section D3 up to [location]. After traveling unit section D3, Vehicle V continues Let's continue driving. From unit section D2 to unit section D3, the road surface conditions are There is a bad, rough road R. Also, while vehicle V travels through the unit section D1 to D3, The events we want to detect as triggers include sudden acceleration, sudden braking, sudden steering, and impacts from the vehicle. Assume that no accidents, collisions, or other incidents have occurred.

[0031] Figure 3 shows the detected vibration value G of vehicle V when vehicle V travels on the road shown in Figure 2 (hereinafter referred to as single An example of the change in the detected value (G) and the positive and negative thresholds for each unit interval D1 to D3 are shown below. This is a conceptual representation. In Figure 3, the vertical axis represents the detected value, and the horizontal axis represents the distance.

[0032] At point A where vehicle V has started moving, the threshold setting unit 41 detects the occurrence of an event. To achieve this, pre-set initial thresholds THa and THB are set as positive and negative thresholds. .

[0033] While traveling through unit section D1, the event detection unit 43 uses the detected value G and the threshold setting unit 41 to set The event occurrence is determined by comparing the defined positive and negative thresholds THa and THb, respectively. The detection is performed. In the unit interval D1 shown in Figure 3, the detected value G is the positive or negative threshold TH. Since a and THb do not exceed the thresholds, the event detection unit 43 does not detect the occurrence of an event. In this case, no event recording is performed in the unit interval D1.

[0034] The threshold update unit 45 determines whether or not the vehicle V has traveled a unit section. In Figure 3, The threshold update unit 45 updates when vehicle V reaches point B and when vehicle V has traveled through the unit section D1. It is determined that it has been done. In the unit interval D1, the detected value G is the positive or negative threshold THa and Since it does not exceed THb, the threshold update unit 45 updates the positive and negative detected values ​​within the unit interval D1. Find the maximum values ​​of G, M1a and M1b.

[0035] The threshold update unit 45 multiplies the obtained maximum values ​​M1a and M1b by a predetermined multiple "3" and then calculates the next unit The positive and negative thresholds TH2a and TH2b to be used in interval D2 are calculated. The positive and negative thresholds THa and THb set by the value setting unit 41 are used to calculate the positive The negative thresholds TH2a and TH2b are also updated.

[0036] Vehicle V then travels through unit section D2. In unit section D2, there is a rough road R. Therefore, the detected value G in the unit section D2 reflects the vibration of the vehicle V due to the rough road R, and the unit section The values ​​are generally larger than those in interval D1. In unit interval D2, the threshold setting unit 41 The updated positive and negative thresholds TH2a and TH2b are set as the positive and negative thresholds, respectively. do.

[0037] While traveling through unit section D2, the event detection unit 43 uses the detected value G and the threshold setting unit 41 to set The defined positive and negative thresholds TH2a and TH2b are compared, respectively, to determine the event. Detect the occurrence.

[0038] The recording control unit 44 records the time when the event detection unit 43 detected the occurrence of an event. Event recording is performed for image data 31 of EV1 for a predetermined period before and after the occurrence of the event. Furthermore, recording control is performed. Unit 44 includes the time before the event occurred, including the time when the event detection unit 43 detected the occurrence of the event. Event recording of EV2 image data 31 is performed for a predetermined period thereafter.

[0039] The threshold update unit 45 updates when vehicle V reaches point C and vehicle V is traveling through the unit section D2. The threshold update unit 45 determines that the positive threshold TH2a has been exceeded within the unit interval D2. Find the maximum values ​​M2a and M2b of the positive and negative detected values ​​G within the unit interval D2, excluding the output value G. Mel.

[0040] The threshold update unit 45 multiplies the obtained maximum values ​​M2a and M2b by a predetermined multiple "3" and then calculates the next unit The positive and negative thresholds TH3a and TH3b to be used in interval D3 are calculated. The positive and negative thresholds TH2a and TH2b, set by the value setting unit 41, were calculated. The positive and negative thresholds TH3a and TH3b are updated. In this way, the detected value G is determined by the rough road R. Based on the detected vibration value G of the vehicle V detected in the unit interval D2 where the vibration becomes larger, the unit interval D3 By updating the positive and negative thresholds, the unit interval D3 is updated for the preceding unit interval D2 Positive and negative thresholds that reflect road conditions can be used.

[0041] Vehicle V then travels through unit section D3. In unit section D3, as well as in unit section D2 Similarly, there is a rough road R. Therefore, the detected value G in the unit section D3 is also affected by the vehicle V due to the rough road R. Reflecting the oscillations, the values ​​are generally larger than those in the unit interval D1. The threshold setting unit 41 sets the updated positive and negative thresholds T as the positive and negative thresholds. Set H3a and TH3b.

[0042] While traveling through unit section D3, the event detection unit 43 uses the detected value G and the threshold setting unit 41 to set The defined positive and negative thresholds TH3a and TH3b are compared, respectively, to determine the event. The occurrence is detected. In the unit interval D3 shown in Figure 3, the detected value G is the positive or negative threshold. Since it does not exceed TH3a and TH3b, the event detection unit 43 detects the occurrence of an event. No. In this case, no event recording will be performed in unit interval D3. Therefore, unit interval D3 Therefore, detecting large values ​​that should not be recorded as events, due to the poor road conditions (R). This prevents incorrect event recording due to the value G.

[0043] The threshold update unit 45 updates when vehicle V reaches point D and vehicle V is traveling through the unit section D3. It is determined that the action was taken. In the unit interval D3, the detected value G is the positive or negative threshold TH3a. And since it does not exceed TH3b, the threshold update unit 45 updates the positive and negative sides within the unit interval D3. The maximum values ​​M3a and M3b of the detected value G are determined. The same process is repeated below to determine the positive and negative values. The threshold value on the side is updated for each unit interval.

[0044] In this way, based on the detected vibration values ​​of vehicle V detected for each unit section, the event is generated. By updating the vibration threshold of vehicle V for detecting vibrations, the road condition of the immediately preceding unit section is determined. A threshold that reflects the situation can be used. This allows for detecting events that are originally intended to be detected, such as collisions. Even though it is not occurring, the vehicle V may vibrate due to vibrations on rough roads or vibrations inherent to the vehicle. The detection value exceeds the threshold, which can suppress the detection of the event. Therefore, unnecessary This can reduce the need to record events.

[0045] [Processing flow of the imaging device] Next, referring to the flowchart in Figure 4, the CPU 40 of the imaging device 1 shown in Figure 1 executes the following: Let me explain an example of the processing flow. When vehicle V starts moving, CPU 40 Start the process shown in Figure 4.

[0046] In step S10, the threshold setting unit 41 sets the threshold value of the vehicle V detected by the acceleration sensor 20. Based on the positive and negative detection values ​​of the motion, an event occurred in which image data 31 should be saved. Positive and negative thresholds are set to determine whether or not the vehicle V is running. The threshold setting unit 41 determines whether or not the vehicle V is running. From the start of the journey until a unit section of a predetermined time or distance has been traveled, Pre-set initial thresholds are used as positive and negative thresholds.

[0047] The process proceeds to step S11, where the information acquisition unit 42 detects the acceleration sensor 20 Obtain the detected vibration values ​​of vehicle V.

[0048] The process proceeds to step S12, where the positive side and The negative detection value and the positive and negative thresholds set by the threshold setting unit 41 are respectively The event detection unit 43 compares the vibrations of the vehicle V to detect the occurrence of an event. If the detected value is positive, it is determined whether the positive detected value is greater than the positive threshold. If the positive vibration detection value of vehicle V is determined to be greater than the positive threshold, an event is triggered. Detects the presence of the vehicle V. Also, if the detected vibration value of the acquired vehicle V is on the negative side, the detection value is set to the negative threshold. It is determined whether the value is smaller than or equal to the value, and if the negative side detected value of the vibration of vehicle V is smaller than the negative side threshold, The event detection unit 43 detects the occurrence of an event. If the answer in step S12 is YES, the process proceeds to step S13. Meanwhile, event detection unit 4 If step 3 does not detect the occurrence of an event (NO in step S12), the process proceeds to step S Proceed to 14.

[0049] In step S13, the recording control unit 44 records the event including the time the event occurred. Image data 31 for a predetermined period before and after the occurrence of the event is stored as image data 51 on a recording medium 50. The event to be recorded is recorded, and the process proceeds to step S14.

[0050] In step S14, the threshold update unit 45 determines that the vehicle V has been in service for a predetermined time or distance Determine whether or not a certain unit section has been traveled. If vehicle V has traveled the unit section (step If the answer in S14 is YES, the process proceeds to step S15. Meanwhile, vehicle V travels a unit section. If not (NO in step S14), the process returns to step S11.

[0051] In step S15, the threshold update unit 45 determines the positive or negative value within the unit section traveled. The maximum positive and negative detected values ​​of vehicle V vibration within a unit interval, excluding detected values ​​that exceed the threshold. Find the value.

[0052] The process proceeds to step S16, where the threshold update unit 45 checks the unit interval obtained in step S15. The maximum values ​​of the positive and negative detected vibrations of vehicle V are multiplied by a predetermined multiple, and in the following unit interval... Calculate the positive and negative threshold values ​​to be used.

[0053] The process proceeds to step S17, where the positive and negative thresholds set by the threshold setting unit 41 are The values ​​are updated to the positive and negative thresholds calculated in step S16, and the process proceeds to step S11. Return to the previous state. From this point onward, the CPU 40 will continue until the vehicle V stops moving and the power to the imaging device 1 is turned off. Then, the process from steps S11 to S17 in Figure 4 is repeated.

[0054] [Effects of the First Embodiment] As described above, the imaging device 1 according to the first embodiment includes an imaging unit 10 and a vibration detection unit ( Acceleration sensor 20, threshold setting unit 41, event detection unit 43, recording control unit 44, The system includes a threshold update unit 45 and an imaging unit 10 which captures images of the interior or exterior of the vehicle V and generates images. The data set 31 is generated. The vibration detection unit 20 detects vibrations of the vehicle V. The threshold setting unit 41 sets the threshold. Based on the vibration detection value of the vehicle V detected by the vibration detection unit 20, the image data 31 is saved. A threshold is set to determine whether or not an event has occurred. The event detection unit 43, The vibration detection unit 20 detects the vibration of the vehicle V, and the threshold setting unit 41 sets the value of the vibration detected by the vibration detection unit 20. The system detects the occurrence of an event by comparing it to a threshold.

[0055] The recording control unit 44, when the event detection unit 43 detects the occurrence of an event, Image data 31 of a predetermined period before and after the occurrence of an event, including the time the event occurred, is stored on a recording medium. The data is recorded in the body 50. The threshold update unit 45 updates the data at a predetermined time or distance while the vehicle V is traveling. For each unit interval, the maximum value of the vibration detected in vehicle V is determined. Based on the maximum value of the detected value... Then calculate the threshold to be used in the next unit interval. The threshold set by the threshold setting unit 41 Update.

[0056] This allows vibration detection to be performed for each unit section traveled by vehicle V, excluding detection values ​​that exceed the threshold. The unit determines the maximum value of the vibration detected by the vehicle V, and based on the maximum value of the detected value, the following unit The threshold to be used in the unit interval is updated. That is, the vibration of vehicle V detected in the immediately preceding unit interval. Based on this, a vibration threshold for vehicle V to detect the occurrence of an event can be set. The vibration threshold of vehicle V can be set to reflect the road conditions of the unit section. In addition, when there are no abnormalities such as collisions, the vibration of the vehicle V is due to shaking on rough roads or vibrations inherent to the vehicle. This can suppress the detection of an event occurring when the threshold is exceeded, thus preventing unnecessary event recording. This can reduce the amount of work that is done.

[0057] [Second Embodiment] Next, a second embodiment of the present invention will be described. As described above, the imaging apparatus according to the first embodiment 1 excludes detected values ​​that exceeded the positive or negative threshold for each unit section while vehicle V was in motion. The maximum values ​​of the positive and negative vibrations of vehicle V are determined. Then, for each unit interval... Based on the maximum values ​​of the positive and negative detected vibrations of vehicle V, the following positive values ​​should be used in the next unit interval. The positive and negative thresholds are calculated, and the positive and negative thresholds set by the threshold setting unit 41 are used. This will be updated regularly.

[0058] In contrast, the imaging device 1 according to the second embodiment acquires the position information of the vehicle V and, in unit intervals The predetermined position information and the maximum of the positive and negative detected values ​​of the vehicle V vibration obtained for each unit interval. The values ​​are recorded in association with each other. Then, the positive and negative sides of the vibration of vehicle V are detected based on past driving data. When traveling through a unit section where the maximum value has been recorded, the predetermined position information of that unit section is associated with Based on the maximum values ​​of the positive and negative detected vibrations of the attached and recorded vehicle V, the positive and Set the negative threshold.

[0059] The following describes an example of the configuration of the imaging device 1 according to the second embodiment, with reference to Figure 5. Thus, the second embodiment differs from the first embodiment in that the imaging device 1 is a GNSS receiver 60 The imaging device 1 is further equipped with a CPU 40 which further comprises a determination unit 46 and an information recording unit 47. This is the result. For components that overlap with the first embodiment, the reference numerals are used and their explanations are omitted. The following will focus on explaining the differences from the first embodiment.

[0060] The GNSS receiver 60 is a GPS receiver or the like, and receives radio waves from multiple artificial satellites. This detects the position of the vehicle on the ground. The GNSS receiver 60 detects the position of the vehicle V. It functions as an information acquisition unit. The GNSS receiver 60, for example, receives the position of the vehicle V at a frequency of 1 Hz. Location information is acquired. The GNSS receiver 60 stores the detected vehicle V's location information in its internal memory 30. It will be temporarily recorded. Note that "GPS" stands for "Global Positioning S GNS is an abbreviation for "Global Positioning System." The position of vehicle V is calculated within the S receiver 60, but the CPU 40 calculates the position of vehicle V. That's good too.

[0061] In the second embodiment, the information acquisition unit 42 of the CPU 40 is detected by the GNSS receiver 60. The information acquisition unit 42 acquires the current location information of vehicle V. ru.

[0062] Furthermore, the information acquisition unit 42 acquires predetermined position information for the unit section. The information acquisition unit 42, For example, the position information of vehicle V at the beginning of a unit section when vehicle V is traveling a unit section. The information recording unit 47 acquires, for example, the information within a unit interval as predetermined position information. The position information of vehicle V at the time in between may be acquired as predetermined position information for a unit section. Multiple time points in a unit section, such as the position information of vehicle V at the beginning and end of the section. The position information of vehicle V may be obtained as predetermined position information for a unit section. The method for setting a fixed position is not particularly limited.

[0063] The information recording unit 47 records the positive and negative vibrations of the vehicle V obtained by the threshold update unit 45 for each unit interval. The maximum value detected on the side is associated with predetermined position information within a unit interval and recorded. The recording unit 47 determines that the determination unit 46, described later, is traveling a unit section that vehicle V has traveled in the past. If determined, the positive and negative vibrations of vehicle V recorded when it traveled the same unit section in the past are used. The maximum value of the negative detection and the predetermined position information of the unit section are obtained when the unit section is traveled this time. The maximum values ​​of the positive and negative detected vibrations of vehicle V are updated with predetermined position information for a unit interval. .

[0064] The information recording unit 47 records the maximum values ​​of the positive and negative detected values ​​of the vibration of the vehicle V for each unit section, In association with predetermined position information of a unit interval, different from the event storage area of ​​the recording medium 50. The information is recorded in the memory area. The information recording unit 47 records the maximum values ​​of the positive and negative vibrations of the vehicle V, and the unit The predetermined location information of the section may be associated with and recorded in the internal memory 30. The data may be recorded in a memory other than the body 50 and the internal memory 30.

[0065] The determination unit 46 uses the predetermined position information of the unit interval recorded by the information recording unit 47 and the current Based on the location information of vehicle V, it is determined whether or not vehicle V is traveling on a unit section that it has traveled in the past. The determination unit 46 determines, for example, the current position of vehicle V as recorded by the information recording unit 47. When the vehicle V is within a predetermined range from a predetermined position within the section, it will travel the unit section that it has previously traveled. The determination unit 46 determines that the action should be taken if multiple predetermined position information for a unit interval is recorded. In this case, if the vehicle V's current position is between predetermined positions in multiple unit intervals, the vehicle It may be determined that both Vs are traveling through a unit section that they have traveled in the past.

[0066] The threshold setting unit 41, when the vehicle V starts moving, sets positive and negative thresholds as predetermined values. The threshold setting unit 41 sets the initial threshold. The determination unit 46 determines that the vehicle V has traveled in the past. If it is determined that the vehicle is traveling through a specified unit section, the vehicle is recorded in association with the predetermined location information of that unit section. Based on the maximum values ​​of the positive and negative detected vibrations of the recorded vehicle V, positive and negative thresholds are set. The threshold setting unit 41 sets the vehicle recorded in association with predetermined position information of a unit section. The maximum values ​​of the positive and negative detection values ​​of the vibration of V are multiplied by a predetermined multiple to obtain the threshold values ​​for the positive and negative sides. The threshold setting unit 41 calculates the positive and negative thresholds for the current unit section traveled. These are set as positive and negative thresholds to determine whether or not an event has occurred.

[0067] The threshold setting unit 41 determines that the determination unit 46 has not traveled a unit section that the vehicle V has traveled in the past. The threshold is determined, and when the unit section immediately preceding is traveled, the threshold update unit 45 updates the positive and negative thresholds. If updated, the updated positive and negative thresholds will be set, as in the first embodiment. These are set as positive and negative thresholds to determine whether or not a T occurred.

[0068] Next, referring to Figure 6, the information acquisition unit 42, determination unit 46, information recording unit 47, and threshold setting unit 41. An example of the operation of the threshold update unit 45 will be described. Note that the event detection unit 43 and recording The operation of the control unit 44 is the same as in the first embodiment, so its description will be omitted.

[0069] Figure 6 shows the vibration of vehicle V when it travels the same road shown in Figure 2 for the second time. The dynamic detected value G (hereinafter simply referred to as the detected value G), and the positive and negative sides for each unit interval D1 to D3. This shows an image of the threshold. Note that in Figure 6, the vertical axis represents the detected value and the horizontal axis represents the distance.

[0070] The information recording unit 47 records that when the unit section D1 to D3 was traveled last time, the threshold update unit 45 was set to the unit section The maximum positive and negative values ​​M1a and M1b obtained in interval D1, and the units acquired by the information acquisition unit 42. The location information of point A, which is a predetermined location in section D1, is recorded in association with the data. Threshold update unit 4 5 is the maximum positive and negative values ​​M2a and M2b obtained in the unit interval D2, and the information acquisition unit 42 is acquired The location information of point B, which is a predetermined position within the acquired unit interval D2, is recorded in association with the threshold. The value update unit 45 obtains the maximum positive and negative values ​​M3a and M3b in the unit interval D3, and acquires information. The unit 42 records the location information of point C, which is a predetermined position in the unit interval D3, in association with the acquired location. It is.

[0071] In Figure 6, vehicle V starts from point A, just as in the previous run, and then moves from point A to point A. The vehicle travels a predetermined distance, unit section D1, to point B. After traveling unit section D1, the vehicle travels to point The vehicle travels a predetermined distance, unit section D2, from point B to point C. After traveling unit section D2, The vehicle travels a predetermined distance, known as unit section D3, from point C to point D.

[0072] At point A where vehicle V has started moving, the threshold setting unit 41 detects the occurrence of an event. To achieve this, pre-set initial thresholds THa and THB are set as positive and negative thresholds. .

[0073] The information acquisition unit 42 acquires the current location information of vehicle V at point A.

[0074] The determination unit 46 determines that the position of vehicle V acquired at point A is recorded in the information recording unit 4 during the previous run. From the position of point A, which is a predetermined position in the unit interval D1 recorded by 7, within a predetermined range If this occurs, it is determined that vehicle V is traveling through a unit section D1 that it has traveled in the past.

[0075] The threshold setting unit 41 receives the position information of point A, which is a predetermined position in the unit section D1, during the previous run. The maximum positive and negative values ​​M1a and M1b recorded in association with the value are multiplied by a predetermined multiple "3". Then, calculate the positive and negative thresholds TH1a′ and TH1b′. The negative thresholds TH1a′ and TH1b′ are used as the positive and negative thresholds within the current unit interval D1. Set it.

[0076] The threshold update unit 45 updates when vehicle V reaches point B and vehicle V is traveling through the unit section D1. It was determined that the operation was completed, and the maximum value M1a of the positive and negative detected values ​​G within the unit section D1 that was operated this time was calculated. The threshold update unit 45 calculates ' and M1b'. The threshold update unit 45 multiplies the calculated maximum values ​​M1a' and M1b' by a predetermined number. Multiply by the number "3" to obtain the positive and negative thresholds TH2a and TH2a to be used in the next unit interval D2. The positive and negative thresholds TH1 set by the threshold setting unit 41 are calculated. Update a' and TH1b' to the calculated positive and negative thresholds TH2a and TH2b.

[0077] The information acquisition unit 42 acquires the current position information of vehicle V at point A, for the predetermined unit section D1. The location information is acquired. The information recording unit 47 records the information when the unit section D1 was traveled last time. The positive and negative maximum values ​​M1a and M1b, and point A, which is a predetermined position in the unit interval D1. The position information is obtained using the maximum positive and negative values ​​M1a′ and M1b′, and the single value obtained this time. The location information of point A, which is a predetermined position in position interval D1, is updated.

[0078] Vehicle V then travels through unit section D2. The information acquisition unit 42 reports that at point B, currently Obtain the location information of vehicle V.

[0079] The determination unit 46 determines that the current position of vehicle V, acquired at point B, is recorded in the information from the previous drive. From the position of point B, which is a predetermined position in the unit interval D2 recorded by the recording unit 47, within a predetermined range If the vehicle is within the specified range, it is determined that vehicle V is traveling through a unit section D2 that it has traveled in the past.

[0080] The threshold setting unit 41 receives the position information of point B, which is a predetermined position in the unit section D2, during the previous run. The maximum positive and negative values ​​M2a and M2b recorded in association with the value are multiplied by a predetermined multiple "3". Then, the positive and negative thresholds TH2a′ and TH2b′ are calculated. The negative thresholds TH2a′ and TH2b′ are defined as the positive and negative thresholds within the current unit interval D2. Set it.

[0081] The threshold update unit 45 updates when vehicle V reaches point C and vehicle V is traveling through the unit section D2. It was determined that the operation was completed, and the maximum value M2a of the positive and negative detected values ​​G within the unit section D2 that was operated this time was calculated. The threshold update unit 45 calculates ' and M2b'. The threshold update unit 45 multiplies the calculated maximum values ​​M2a' and M2b' by a predetermined number. Multiply by the number "3" to obtain the positive and negative thresholds TH3a and TH3a to be used in the next unit interval D3. The positive and negative thresholds TH2 set by the threshold setting unit 41 are calculated. Update a' and TH2b' to the calculated positive and negative thresholds TH3a and TH3b.

[0082] The information acquisition unit 42 acquires the position information of vehicle V at point B and the predetermined position of the current unit section D2. The information is acquired. The information recording unit 47 records the information recorded when the unit section D2 was traveled last time. The maximum values ​​M2a and M2b on the positive and negative sides, and the position of point B, which is a predetermined position in the unit interval D2. The information obtained includes the maximum positive and negative values ​​M2a′ and M2b′, and the unit interval obtained. The location information of point B, which is the designated location of D2, is updated.

[0083] Vehicle V then travels through unit section D3. The information acquisition unit 42 reports that at point C, currently Obtain the location information of vehicle V.

[0084] The determination unit 46 determines that the current position of vehicle V, acquired at point C, is recorded in the information from the previous run. From the location of point C, which is a predetermined position in the unit interval D3 recorded by the recording unit 47, within a predetermined range If the vehicle is within the specified range, it is determined that it is traveling through a unit section D3 that it has traveled in the past.

[0085] The threshold setting unit 41 receives the position information of point C, which is a predetermined position in the unit section D3, during the previous run. The maximum positive and negative values ​​M3a and M3b recorded in association with the value are multiplied by a predetermined multiple "3". Then, calculate the positive and negative thresholds TH3a′ and TH3b′. The negative thresholds TH3a′ and TH3b′ are used as the positive and negative thresholds within the current unit interval D3. Set it.

[0086] The threshold update unit 45 updates when vehicle V reaches point D and vehicle V is traveling through the unit section D3. It was determined that the operation was completed, and the maximum value M3a of the positive and negative detected values ​​G within the unit section D3 that was operated this time was calculated. ', M3b' is determined. The same process is repeated to obtain the positive and negative threshold values ​​for the unit interval. Update it each time.

[0087] The information acquisition unit 42 acquires the position information of vehicle V at point C, and then selects the predetermined position of the current unit section D3. The information is acquired. The information recording unit 47 records the information recorded when the unit section D3 was traveled last time. The maximum values ​​M3a and M3b on the positive and negative sides, and the position of point C, which is a predetermined position in the unit interval D3. The information obtained includes the maximum positive and negative values ​​M3a′ and M3b′, and the unit interval obtained. The location information of point C, which is the predetermined position of D3, is updated. The same operation is repeated thereafter. The maximum values ​​on the positive and negative sides, along with predetermined position information for each unit interval, are updated.

[0088] This allows us to determine the maximum positive and negative values ​​of the vehicle V vibration when it has traveled the same unit section in the past. By referring to this, you can set a vibration threshold for vehicle V to detect the occurrence of an event. This improves the accuracy of detecting the occurrence of an event within a given unit interval.

[0089] [Processing flow of the imaging device] Next, referring to the flowchart in Figure 7, the CPU 40 of the imaging device 1 according to the second embodiment An example of the processing flow executed by the system is described below. The CPU 40 processes the timing when the vehicle V starts moving. Then, the process shown in Figure 7 is started. Step S201 in Figure 7 is the same as step S10 in Figure 4. The process is the same, and steps S205 to S211 in Figure 7 are the same as steps S11 to S17 in Figure 4. Since the process is the same, the explanation will be omitted.

[0090] In step S202, the information acquisition unit 42 receives the information detected by the GNSS receiver 60. The information acquisition unit 42 acquires the current location information of vehicle V.

[0091] The process proceeds to step S203, where the determination unit 46 determines that the information previously recorded by the information recording unit 47 Based on the predetermined location information of the unit section and the current location information of vehicle V, vehicle V has traveled in the past. The determination unit 46 determines whether or not to travel through the specified unit section. For example, the current position of the vehicle V. If vehicle V is within a predetermined range from a predetermined position in a previously recorded unit section, It is determined that the vehicle is traveling the unit section it has traveled in the past. If the answer is YES in step S203, the process proceeds to step S204. Meanwhile, vehicle V If the train does not travel the same unit section it has traveled in the past (NO in step S203), the process is... Proceed to step S205.

[0092] In step S204, the threshold setting unit 41 associates predetermined position information of a unit interval with Based on the maximum values ​​of the positive and negative detected values ​​recorded in the past, positive and negative thresholds are set. The threshold setting unit 41 determines the positive value recorded in the past in association with predetermined position information of a unit interval. The threshold values ​​for the positive and negative sides are calculated by multiplying the maximum values ​​of the positive and negative side detection values ​​by a predetermined multiple. The value setting unit 41 determines whether or not an event has occurred based on the calculated positive and negative thresholds. These are set as positive and negative thresholds. The process then proceeds to step S205.

[0093] In step S212, the information acquisition unit 42 acquires predetermined position information for a unit section. The information acquisition unit 42, for example, at the first moment of a unit section when vehicle V is traveling through that unit section. The position information of vehicle V is acquired as predetermined position information for a unit section.

[0094] The process proceeds to step S213, and the information recording unit 47 records the threshold update unit 4 in step S209. The maximum values ​​of the positive and negative detected values ​​obtained by 5, and the information acquisition unit 42 acquired in step S212. The predetermined position information of the unit interval is recorded in association with the recorded information. The information recording unit 47 then makes a determination. When section 46 determines in step S203 that vehicle V is traveling a unit section that it has traveled in the past, The sum is the maximum value of the positive and negative detected values ​​recorded when the same unit section was traveled in the past. The predetermined position information of the unit interval is the maximum of the positive and negative detected values ​​obtained in step S209. The value is updated with the predetermined position information of the unit interval obtained in step S212.

[0095] After completing the process in step S213, the CPU 40 will then take the image after the vehicle V has stopped moving. The process in steps S202 to S213 of Figure 7 is repeated until the power to device 1 is turned off.

[0096] [Effects of the second embodiment] As described above, the imaging device 1 according to the second embodiment includes a position information acquisition unit (GNSS receiver). The system further comprises a signaling device 60, an information recording unit 47, and a determination unit 46. (Location information acquisition unit 60) The system acquires the location information of vehicle V. The information recording unit 47 records the threshold update unit 45 for each unit interval. The maximum value of the detected value is associated with the predetermined position information of the unit interval and recorded. (Determination Unit 4) 6, based on the current location information of vehicle V and predetermined location information of a unit section, determines that vehicle V has a past The threshold setting unit 41 determines whether or not the vehicle travels the unit section it has traveled. The determination unit 46 determines whether the vehicle If it is determined that both Vs are traveling through a unit section they have traveled in the past, the predetermined position information for that unit section will be provided. Based on the maximum values ​​of the positive and negative detected values ​​recorded in association with the positive and negative thresholds Set it.

[0097] The maximum value of the vibration detected by the vehicle V, obtained for each unit section, and the predetermined position information of the unit section. The following are recorded in association with each other. Based on the current location information of vehicle V and the predetermined location information of the unit section. When it is determined that vehicle V is traveling through a unit section that it has traveled in the past, the location information of vehicle V is The maximum value of the vibration detected by vehicle V, recorded in association with the event in a unit interval. This can be set as a vibration threshold for vehicle V to detect the occurrence of the same event in the past. The event occurrence is detected by referring to the maximum value of the vibration detected for vehicle V when traveling a unit section. A threshold vibration of the vehicle V to be emitted can be set. This can improve the accuracy of detecting the occurrence of [unclear / unclear].

[0098] Furthermore, if it is determined that vehicle V is traveling a unit section that it has traveled in the past, The maximum value of the vibration detected by vehicle V recorded when traveling through the section and the predetermined positional information of the unit section. The report is based on the maximum value of the detected value obtained when driving the unit section this time and the predetermined position information of the unit section. Update. This will ensure that the latest road conditions for the same unit section are always reflected, and the occurrence of events will be updated. A threshold can be set to detect the occurrence of an event within a certain unit interval. The detection accuracy can be further improved.

[0099] As described above, embodiments of the present invention have been described, but the descriptions and drawings that constitute part of this disclosure are This disclosure should not be understood as limiting the invention. From this disclosure, various alternatives will be known to those skilled in the art. Alternative embodiments, examples, and operational techniques will become clear. [Explanation of symbols]

[0100] 1. Imaging device 10 Imaging Unit 20. Vibration detection unit (accelerometer) 30 internal memory 31 Image data 40 CPU 41 Threshold setting section 42 Information Acquisition Department 43 Event detection unit 44 Recording Control Unit 45. Threshold update section 46 Judgment section 47 Information Records Department 50 Recording media 51 Image data 60 GNSS receiver V Vehicle

Claims

[Claim 1] An imaging unit that captures images of the interior or exterior of a vehicle and generates image data, A vibration detection unit for detecting vibrations of the vehicle, A threshold setting unit sets a threshold for determining whether or not an event has occurred that warrants saving the image data, based on the vibration detection value of the vehicle detected by the vibration detection unit. A location information acquisition unit that acquires location information of the aforementioned vehicle, An information recording unit records the maximum value of the vibration detected by the vibration detection unit for a unit section of the vehicle, in association with predetermined position information of the vehicle for that unit section. A determination unit that determines whether or not the vehicle is traveling on a road it has traveled on in the past, based on the vehicle's current location information and predetermined location information of the unit section recorded in the past, Equipped with, If the determination unit determines that the vehicle is traveling on a road it has traveled on in the past, the threshold setting unit sets the threshold based on the maximum value of the detected vibration of the vehicle, which was recorded in association with predetermined position information of the unit section when the vehicle traveled on the road in the past. Imaging device.