KR100844909B1 - Incident information recording device and correction method for easy sensor calibration - Google Patents

Abstract

The present invention relates to an accident information recording apparatus and a correction method for easy sensor correction, and more particularly, by mounting an acceleration sensor on a camera installed to face the front of the vehicle, reducing the correction of the acceleration sensor after initial installation, and separately detecting the sensor. The present invention relates to an accident information recording device and a method for correcting a sensor, which are provided with a correction button so that a user can easily correct the acceleration sensor.

The present invention is a camera unit consisting of a camera which is an image capturing means and an acceleration sensor mounted on the camera to detect an acceleration of a vehicle, and a main body that stores driving information by processing an input signal including an image signal transmitted from the camera unit. And a wired / wireless interface for supporting wired / wireless communication between the camera unit and the main body unit. In addition, the camera unit is provided with a separate sensor correction button, the user can easily correct the three-dimensional coordinate axis of the acceleration sensor with the click of a button.

Description

Accident data storing apparatus having easy sensor calibration for a vehicle and calibration method there of}

1 is a block diagram showing the configuration of a vehicle accident information recording apparatus that is easy to calibrate a sensor according to a first embodiment of the present invention.

FIG. 2 is a view showing a vehicle equipped with a vehicle accident information recording apparatus that is easy to calibrate a sensor according to a first embodiment of the present invention.

3 is a block diagram showing the configuration of a vehicle accident information recording apparatus that is easy to calibrate a sensor according to a second embodiment of the present invention.

4 is a flowchart illustrating a calibration process of an acceleration sensor according to an exemplary embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: camera unit 110: camera

120: acceleration sensor 130: sensor calibration button

140: correction circuit 200: main body

210: control unit 220: volatile memory

230: non-volatile memory 240: input and output terminal

300: wired / wireless interface

The present invention relates to an accident information recording apparatus and a correction method for easy sensor correction, and more particularly, by mounting an acceleration sensor on a camera installed to face the front of the vehicle, reducing the correction of the acceleration sensor after initial installation, and separately detecting the sensor. The present invention relates to an accident information recording device and a method for correcting a sensor, which are provided with a correction button so that a user can easily correct the acceleration sensor.

Recently, in order to obtain data for judging the situation at the time of a vehicle accident and the fault between the parties, research and development of a vehicle black box for recording various driving information such as the vehicle speed has been actively conducted. In particular, the vehicle accident information recording device which has a camera in the vehicle and records the external situation at the time of the accident as image information, and can determine the cause of the accident by using the external image information before and after the accident as well as various driving information has recently been spotlighted. I am getting it.

Looking at the vehicle accident information recording devices that can determine the cause of the accident by using the external image information before and after the accident as well as the various driving information as described above, most of the integrated vehicle accident information recording device and the camera is included in the main body and In addition, the camera is divided into a separate vehicle accident information recording apparatus installed separately from the outside of the main body.

In the case of using the integrated vehicle accident information recording apparatus, since the whole body part is attached to the front part of the vehicle and fixed, the calibration of the acceleration sensor included in the body part is necessary only at the time of initial installation. However, since a memory, an acceleration sensor, a plurality of cameras, and other circuit driving are required inside the main body, there is a limit in size miniaturization.

In case of using the separate vehicle accident information recording device, since the main body including the acceleration sensor, the memory, the control unit, and other circuit driving and the plurality of cameras are separated from each other, the size of the camera is very small. Afterwards, it can be mounted at a position desired by the user. However, in order to protect the data stored in the memory and the driving circuit, the main body should be located inside the vehicle, which is usually inconspicuous. Due to the size of the main body, there is a lot of space limitation in selecting an appropriate position inside the vehicle. In addition, when the main body is removed from the vehicle or the position is changed to download the image data and driving information, the position of the existing acceleration sensor values of the X, Y, and Z axes stored in the main body is exactly the same as the first position. In addition to the difficulty of positioning, whenever the set position of the main body portion is changed due to the sensitivity of the sensor, there is a problem that recalibration of the acceleration sensor along each axis is required.

The present invention is to solve the problems of the vehicle accident information recording apparatus and the correction method according to the prior art. That is, an object of the present invention is to mount the acceleration sensor to the camera installed to face the front of the vehicle, reduce the correction of the acceleration sensor after the initial installation, and equipped with a separate sensor correction button so that the user can easily correct the acceleration sensor Provides an accident information recording device and a correction method that is easy to calibrate the sensor.

The present invention as a technical concept for achieving the above object, the camera, which is an image photographing means, an acceleration sensor mounted on the camera to sense the impact amount of the vehicle, and a sensor correction button for instructing the three-dimensional coordinate axis correction of the acceleration sensor A camera unit including a; A volatile memory for temporarily storing data transmitted from the camera unit, a nonvolatile memory for storing accident related information when an accident occurs, an input / output terminal for transmitting data of the nonvolatile memory to the outside, and controlling the respective devices A main body part including a control part and separated from the camera part and independently provided; And a wired / wireless interface for supporting wired / wireless communication between the camera unit and the main body unit. The camera unit detects a click of the sensor correction button by a user and is detected by the acceleration sensor. A correction circuit unit configured to compare the three-dimensional coordinate axis acceleration value and the acceleration value of the preset reference coordinate axis, set a correction amount, and transmit the acceleration value to which the set correction amount is applied to the controller of the main body unit through the wired / wireless interface. Provided is a vehicle accident information recording apparatus that is easy to calibrate the sensor, characterized in that included.

In addition, when the user clicks the sensor calibration button, the acceleration sensor detects the acceleration value according to the current three-dimensional coordinate axis; Comparing the detected acceleration value with an acceleration value along a pre-stored reference coordinate axis; If the detected acceleration value is different from the acceleration value along the reference coordinate axis, setting the detected acceleration value as a correction amount for acceleration of each axis; It provides a sensor calibration method.

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

1 is a block diagram showing the configuration of a vehicle accident information recording apparatus that is easy to calibrate a sensor according to a first embodiment of the present invention.

As shown in FIG. 1, the vehicle accident information recording apparatus according to the first embodiment of the present invention includes an acceleration sensor 120 mounted on the camera 110 and the camera 110 as an image capturing means to detect the acceleration of the vehicle. A main body 200 configured to store the driving information by processing an input signal including a video signal transmitted from the camera unit 100 and the camera unit 100, and the camera unit 100 and the main body 200. It consists of a wired / wireless interface 300 to support wired / wireless communication. In addition, the camera unit 100 is provided with a sensor correction button 130 using a separate or existing button, the user can easily correct the acceleration sensor 120 by clicking the button.

The camera unit 100 includes a camera 110, which is an image capturing means, and an acceleration sensor 120 provided inside to sense acceleration of the vehicle. In this case, the camera 110 may be a CMOS camera, but a CCD image sensor, an IR camera, or the like may be used. The acceleration sensor 120 is fixed to the inside of the camera unit 100 to rotate integrally with the camera 110, to detect the acceleration in the three-dimensional coordinate axis (x, y, z) in a state rotated at an arbitrary angle. The acceleration sensor 120 employs a semiconductor device that can measure the acceleration in all directions of the three-dimensional space, it is possible to use a variety of acceleration sensors, such as piezoresistive type, piezoelectric type, tunneling type, capacitive type.

When the camera unit 100 is installed, the user attaches to the windshield of the vehicle so that the photographing direction of the camera 110 faces the front of the vehicle. The user is positioned above or below the windshield so as not to obstruct the driver's view. do. In addition, the camera 110 may be additionally provided at the rear or both sides in addition to the front of the vehicle to capture an external image in each direction.

The main body 200 includes a volatile memory 220 for temporarily storing data, a nonvolatile memory 230 for storing accident related information when an accident occurs, and data for transmitting the data of the nonvolatile memory 230 to the outside. And an input / output terminal 240 and a controller 210 for controlling the devices.

The volatile memory 220 stores a predetermined amount of various data transmitted from the controller 210. In the present invention, the types of data to be stored are, for example, image data, acceleration, estimated time of accident occurrence (shock detection time), and visual information such as data collection time or storage time.

The nonvolatile memory 230 reads and permanently stores all data stored in the volatile memory 220 according to the instruction of the controller 210 at the time of an accident, thereby providing data for analyzing the cause of future accidents.

In addition, by connecting the input and output terminal 240 to the nonvolatile memory 230, it is possible to reproduce the driving information before and after the accident stored in the nonvolatile memory 230 after the accident on the PC. In other words, by connecting the input and output terminal 240 and the PC with a USB cable, and running the accident information playback program installed in the PC to reproduce the image information and driving information before and after the accident stored in the data storage means, the cause of the accident carefully Can be analyzed. In addition, the accident record data can be downloaded to a USB storage device through an input / output terminal and analyzed on a PC.

The controller 210 controls the respective devices, and when the acceleration value output from the acceleration sensor 120 becomes equal to or greater than the reference value, the controller 210 determines the accident situation, reads all the data stored in the volatile memory 220, and then reads the nonvolatile data. Permanently stored in the memory 230. In this case, the controller 210 may calculate an acceleration of only two axes to one axis to detect an accident occurrence only by the acceleration value acting on the front-rear direction or the left-right direction of the vehicle.

The wired / wireless interface 300 provides wired / wireless communication between the camera unit 100 and the main body 200 and, in the case of wireless, communicates with each other through a short range wireless communication channel such as Bluetooth, WLAN, or RF. do.

FIG. 2 is a view showing a vehicle equipped with a vehicle accident information recording apparatus that is easy to calibrate a sensor according to a first embodiment of the present invention.

As shown, the camera unit 100 for acquiring the image data and the driving information of the vehicle is attached to the windshield of the vehicle so that the photographing direction of the camera faces the vehicle front, and the camera unit 100 through a wired / wireless interface. The main body 200 is connected to the wired and wireless and is mounted on the rear of the vehicle. However, since the main body 200 has only a memory, a control unit, and a driving circuit, the size of the main body 200 is smaller than that of the conventional detachable vehicle accident information recording apparatus, and since the acceleration sensor does not exist in the main body 200, Since it can be located anywhere in the vehicle, it can be installed in the safest place of the vehicle to keep the data safe even in the event of an accident.

In addition, the camera unit 100 attached to the front of the vehicle is separated from the main body, and even if the main body is removed to download the image data and driving information, the acceleration sensor fixed inside the camera does not change the installed position Acceleration sensor calibration is not required except at initial installation.

In addition, the camera unit 100 of the present invention is provided with a separate sensor correction button, the user arbitrarily changes the position of the acceleration sensor in the camera unit 100, or the acceleration sensor due to the impact of the vehicle crash accident When changed, the accelerometer can be easily calibrated with the click of a button.

3 is a block diagram showing the configuration of a vehicle accident information recording apparatus that is easy to calibrate a sensor according to a second embodiment of the present invention.

As shown in FIG. 3, the vehicle accident information recording apparatus according to the second embodiment of the present invention further includes a correction circuit unit 140 in the camera unit 100 to perform sensor correction in the camera unit 100. It can be done independently. The correction circuit unit 140 detects a click of the sensor correction button 130 by the user, and compares an acceleration value with respect to the three-dimensional coordinate axis detected by the acceleration sensor 120 and an acceleration value with respect to the preset reference coordinate axis. Determine whether the acceleration sensor 120 needs to be corrected, and if correction is required, set the detected acceleration value as a correction amount, and then apply the correction amount to the acceleration value detected from the acceleration sensor 120 to transmit it to the controller 210. do.

In this way, by providing the sensor correction technology in the camera unit itself, accurate sensor correction is possible without being affected by the main body part, and the repair is easy due to the failure of the device, and there is no need to perform the sensor correction for each upgrade of the main body part. It is easy to expand and change the device.

Hereinafter, a method of calibrating the acceleration sensor in the vehicle accident information recording apparatus which is easy to calibrate the sensor according to the first and second embodiments will be described in detail. 4 is a flowchart illustrating a calibration process of an acceleration sensor according to an exemplary embodiment of the present invention.

First, when the user clicks a sensor correction button separately provided in the camera unit in the normal state in which the vehicle is stopped (S312), the acceleration sensor detects an acceleration value in the normal state according to the current 3D coordinate axis (S314).

Subsequently, it is checked whether the 3D coordinate axis of the acceleration sensor is changed by comparing the detected acceleration value with the acceleration value according to the preset reference coordinate axis (S316). That is, when the detected acceleration value and the acceleration value according to the reference coordinate axis coincide, it is determined that the three-dimensional coordinate axis of the acceleration sensor is not changed and the correction is not performed.

However, when the detected acceleration value and the acceleration value according to the pre-stored reference coordinate axis are changed, it is determined that the three-dimensional coordinate axis of the acceleration sensor is changed, and by setting the correction amount for the acceleration of each axis from the detected acceleration value (S318) Complete the process. Thereafter, the controller (or the correction circuit unit) calculates the 3D coordinate axis direction acceleration by applying the set correction amount to the acceleration detected by the acceleration sensor (S320).

For example, when the acceleration value according to the reference coordinate axis of the acceleration sensor is set to (0, 0, 0), when the user clicks the sensor calibration button of the camera unit, the acceleration sensor displays the acceleration value according to the current 3D coordinate axis. Will be detected. If the detected acceleration value is (2, 0, 1), the X and Z axes are changed compared to the acceleration values (0, 0, 0) according to the previously stored reference coordinate axis, and thus the acceleration according to the current 3D coordinate axis. Set the value (2, 0, 1) as the compensation amount for the acceleration of each axis. Subsequently, when the 3D coordinate axis direction acceleration is detected as (5, 1, 3), the controller applies the set correction amount (2, 0, 1) to apply the 3D coordinate axis direction acceleration called (3, 1, 2). Will be calculated correctly.

Therefore, even if the accelerometer changes its coordinate axis due to user or external influences, the compensation amount of the acceleration sensor is newly set by clicking the sensor correction button provided separately, and the newly set correction amount is applied to each axial acceleration value detected from the acceleration sensor. Since accurate acceleration is calculated, the user does not need to change the position of the camera unit to directly match the current coordinate axis of the acceleration sensor with the reference coordinate axis.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the accident information recording apparatus according to the present invention, by mounting the acceleration sensor to the camera installed to face the front of the vehicle, reduce the correction of the acceleration sensor after the initial installation, and is equipped with a separate sensor correction button to facilitate the user The accelerometer can be calibrated. In addition, it is possible to perform the sensor correction independently in the camera unit, it is possible to accurately correct the sensor is not affected by the body portion, it is possible to maximize the advantages that can be easily expanded and changed.

In addition, it is possible to more accurately detect when an accident occurs, and provide accident information that can cope with various accident situations including light contact accidents or pedestrian collisions.

Claims (4)

delete delete In the vehicle accident information recording apparatus, A camera unit including a camera as an image photographing means, an acceleration sensor mounted on the camera to sense an impact amount of the vehicle, and a sensor correction button for instructing the three-dimensional coordinate axis correction of the acceleration sensor; A volatile memory for temporarily storing data transmitted from the camera unit, a nonvolatile memory for storing accident related information when an accident occurs, an input / output terminal for transmitting data of the nonvolatile memory to the outside, and controlling the respective devices A main body part including a control part and separated from the camera part and independently provided; And a wired / wireless interface for supporting wired / wireless communication between the camera unit and the main body unit. In the camera unit, Detects a click of the sensor correction button by a user, sets a correction amount by comparing an acceleration value of a preset reference coordinate axis with a 3D coordinate axis acceleration value detected by the acceleration sensor, and applies an acceleration value to which the set correction amount is applied. And a correction circuit unit for transmitting the control unit to the control unit of the main body unit through the wired / wireless interface. In the sensor correction method of a vehicle accident information recording device comprising an camera unit having an acceleration sensor and a sensor correction button, a main body and a wired / wireless interface, When the user clicks the sensor calibration button, detecting an acceleration value according to the current three-dimensional coordinate axis by the acceleration sensor; Comparing the detected acceleration value with an acceleration value along a pre-stored reference coordinate axis; Setting the detected acceleration value as a correction amount for the acceleration of each axis when the detected acceleration value is different from the acceleration value along the reference coordinate axis; Acceleration sensor calibration method of the vehicle accident information recording device easy sensor correction consisting of.

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