附图说明 Brief Description

附图1由加速度信号触发的数码图像拍摄系统的示意图附图2加速度传感装置的结构示意图具体实施方式为了到达记录车辆发生事故瞬间现场图像的目的，本发明将两种技术结合在一起；数码图像拍摄技术和加速度传感技术。 An acceleration sensor apparatus 2 a schematic view of the structure of the drawings Figure 1 is triggered by the acceleration signal of the digital image capturing system diagram showing a specific embodiment of the object of the accident in order to reach the scene of the image recording instantaneous vehicle occurs, the present invention will combine the two technologies; Digital image capture technology and the acceleration sensor technology.

数码图像拍摄技术是一种利用CCD或CMOS等感光元件将光学图像转变数字信号并进行处理和存储的技术。 Digital image capturing technique is a CCD or CMOS sensor, etc. The optical image into a digital signal and is processed and stored utilizing the technique. 一般的数码图像拍摄装置具有光学成像单元、图像传感单元、图像存储单元、图像系统控制器等几个部分，其工作原理简述如下：光学成像单元可以将一定范围的外部景物的光学图像清晰地成像在图像传感单元上，图像传感单元是一个由CCD或CMOS等感光元件构成的二维阵列，感光元件将每一点光的强弱转变为电信号，图像系统控制器将这些电信号以及对应的坐标经过处理转化为特定格式的数码文件，然后将这些文件存储在图像存储单元中。 The average digital image pickup apparatus having several parts of the optical imaging unit, an image sensing unit, image storage unit, an image system controller, it works briefly as follows: optical imaging unit may be an optical image of a range of outside view clear a two-dimensional array imaged on the image sensing unit, image sensing unit is a CCD or a CMOS or the like by the photosensitive elements, the photosensitive element will change at each point of light intensity into an electrical signal, the image of these electrical signals the system controller and the corresponding coordinates processed into a digital file in a specific format, and then these files are stored in the image storage unit. 利用这些文件，通过计算机或其他工具可以进一步显示或输出拍摄下来的图像。 Using these documents, computer or other tools can further display or output filmed images. 要启动数码图像拍摄系统进行拍摄只需要通过图像系统控制器输入一个控制信号，一般的数码图像拍摄系统是通过一个按钮由人来触发的。 To start shooting digital image capture system requires only one control system controller through the image input signal, the average digital image capture system is via a button triggered by people.

加速度传感技术是一种感应物体运动速度变化的技术，通过加速度传感器可以将物体线性运动加速度大小转变为电信号。 Acceleration sensor technology is a change in the velocity of the object sensing technology, linear motion of objects by the acceleration sensor acceleration size can be transformed into electrical signals. 这一技术在汽车中已经得到广泛地应用，例如汽车在发生碰撞时安全气囊的启动就是通过加速度传感器监控汽车速度的改变来实现的。 This technology has been widely used in the automobile, for example, start the car airbag in the event of a collision is changed by the acceleration sensor monitors the vehicle speed to achieve.

本发明结合数码图像拍摄技术和加速度传感技术这两种技术，提出一种由加速度信号触发的数码图像拍摄系统。 The invention combines digital image capture technology and the acceleration sensor technology of these two technologies, presents a digital signal by the acceleration trigger image capture system. 其基本原理如下：首先，利用加速度传感器将汽车的运动加速度大小转变为电信号，然后电信号通过信号放大器的放大后送入到控制信号发生器中，控制信号发生器可以将输入信号与设定的阈值进行比较，当测得的加速度值超过设定的阈值时，控制信号发生器产生一个控制信号输入到图像系统控制器中，图像系统控制器启动数码图像拍摄系统进行图像拍摄，拍摄的图像被存储在图像存储单元以便查询显示。 The basic principle is as follows: First, the size of the acceleration sensor to the car's motion acceleration into an electrical signal, the electrical signal is then amplified by the amplifier after the signal is fed to the control signal generator, the control signal generator and the input signal can be set The threshold value, when the measured acceleration values ​​exceeds the set threshold value, the control signal generator to generate an image system controller, the system controller activates the digital image the image capture system performs image capturing, a captured image is input to the control signal so that the query is stored in the image storage unit display.

根据附图1，本发明包括数码图像拍摄装置和加速度传感装置，其中数码图像拍摄装置的光学成像单元和图像传感单元要对准需要拍摄的方向，而加速度传感器需要固定在车体上并且将加速度传感器上的方向标示对准需要监测的加速度方向；系统启动后，加速度传感系统实时监控汽车的速度变化，当汽车遇到情况被紧急制动时，加速度传感器感应到的汽车加速度超过了设定的阈值，控制信号发生器发出一个信号触发数码图像拍摄系统进行拍摄，拍摄的图像可以是静态的也可以是动态的，而后拍摄的图像、拍摄时间以及拍摄时加速度值等信息被保存到图像存储单元中。 According to Figure 1, the present invention comprises a digital image pickup apparatus and the acceleration sensing means, wherein the digital image capture device of the optical imaging unit and an image sensing unit need to be aligned with the direction of shooting, and the acceleration sensor needs to be fixed to the vehicle body and The direction of the acceleration sensor alignment mark on the direction of acceleration to be monitored; the system starts, acceleration sensor system real-time monitoring of the speed of change in the car, when the car encountered the situation was an emergency brake, acceleration sensor senses the vehicle acceleration exceeds set threshold value, the control signal generator sends a signal to trigger a digital image capture system for shooting, the captured image can be static or dynamic, and then captured images, recording time and other information when shooting acceleration values ​​are saved to image storing means. 当需要对汽车发生的紧急情况进行分析读取有关图像时，只要将图像存储单元与有关计算机设备相连就可以获取，也可通过汽车上装备的显示设备进行显示。 When the need for an emergency car happens to read information about the image analysis, as long as the image storage unit connected with the computer device can be acquired, can also be displayed by a display device on the vehicle is equipped. 利用图像存储单元可以重复擦写的特点，可以适当设定较低的加速度阈值(这一阈值远远低于安全气囊开启的阈值)来保证每次紧急情况都能被可靠的纪录。 Image storage unit may use rewritable characteristics, may be appropriately set lower acceleration threshold (the threshold value is far below the threshold for the airbag to open) to ensure that each emergency situation can be reliably recorded.

根据附图2，加速度传感器1产生的弱电信号通过运算放大器2构成的信号放大器放大，得到一个0到5V的电压信号，然后通过控制信号发生器3中的模数转换器ADC0809将模拟量转换得到数字量，然后这个数字量通过数据总线送入到单片机89C51中进行处理，通过单片机CPU的计算和判别，当加速度值超过设定的限度时，由单片机CPU通过端口P1.2产生一个信号，这一信号通过光耦PC827的隔离输出到数码图像拍摄装置的图像系统控制器中。 According to Figure 2, the weak signal of the acceleration sensor 1 is generated by an operational amplifier 2 amplifying the signal amplifier, the voltage signal to obtain a 0 to 5V, then 3 ADC0809 ADC converted by the analog control signal generator digital, then this figure by the amount of data sent to the microcontroller 89C51 bus for processing by the microcontroller CPU calculation and judgment, when the acceleration value exceeds the limit set by a signal generated by the microcontroller CPU port P1.2, which a signal is output to the digital image system controller of the image pickup apparatus through the optocoupler PC827 isolation. 本实施例中加速度传感器1的型号为ADXL311EB，运算放大器2采用型号为LM2904的运算放大器。 Model 1, the acceleration sensor in this embodiment is ADXL311EB, operational amplifier uses two LM2904 op amp model.