Fatigue driving and drunk driving are serious traffic violations. When the driver is fatigued, it will cause slow response, drowsiness, weakness of limbs, and can not find road traffic conditions in time to take accurate driving control measures, which is prone to traffic accidents [1]. According to the statistics of the Ministry of Communications, during 2015, traffic accidents caused by driver fatigue driving accounted for 10.64% of the total, accounting for 45% of heavy traffic accidents. In the United States, every year a car accident related to fatigue driving has claimed 15,000 lives. The driver of the drink will have visual impairment, slow motor reflex, and reduced judgment. According to statistics, in China, traffic accidents caused by drunk driving account for 40% to 50% per year. It can be seen that vehicle equipment has the necessity of a safe driving system with fatigue detection and drunk driving.
The Advanced Driver Assistant System (ADAS) is a collection of various sensors installed in the vehicle. It collects environmental data inside and outside the vehicle at the first time to identify and detect static and dynamic objects. Technical processing such as tracking, which allows the driver to detect the dangers that may occur in the fastest time, to attract attention and improve the safety of active safety technology. The sensors used in ADAS are mainly cameras, radar, lasers and ultrasonics. They can detect light, heat, pressure or other variables used to monitor the state of the car. They are usually located in the front and rear bumpers, side mirrors, inside the steering column or in the wind. On the glass. Early ADAS technologies focused on passive alarms. When the vehicle detected a potential hazard, an alarm was issued to alert the driver to an abnormal vehicle or road condition. Proactive intervention is also common for the latest ADAS technologies.
Hardware system architecture and solutionThe hardware system of the safe driving system based on ZYNQ AP SoC (ZYNQ All Programmable SoC) [2] is shown in Figure 1. The system is mainly composed of high-speed CMOS image sensor Ov7725, 1.3 megapixel USB network camera, Zynq-7000 scalable processing chip, Data storage unit DDR3, HDMI display, alcohol sensor and speaker. Xilinx's Zynq-7000 scalable processing chip is the core of the entire system. It consists of Processing System (PS) and Programmable Logic (PL). The PS part integrates high performance up to 667GHz. The dual-core ARM Cortex-A9 processor, while the PL part contains a 28-nm FPGA-based (Field-Programmable Gate Array) logic unit and DSP resources.
The PL end drives the [3]Ov7725 camera through the I2C protocol, and caches the image data collected by the camera in an asynchronous clock FIFO (First Input First Output) queue. The FIFO write clock is provided by the Ov7725 camera module, and the asynchronous read clock is provided by the VDMA Engine. Provides, and performs grayscale conversion during the reading process, and then reads the data into the VDMA Engine.
The PS side drives the DDR3 controller through the AXI high-speed bus AXI_HP interface, and reads one frame of picture data, and performs image processing such as face recognition on the picture to obtain the facial features of the face. (3) The PS side simultaneously configures the webcam through the USB-Host bus and obtains image data. The image is displayed on the HDMI display under the Linux system, and the image data is stored in the SD memory card. (4) The PS side drives an internally integrated 12-bit precision ADC converter under the Linux system to digitally convert the analog signal collected by the alcohol sensor.
The warning prompt is finally output to the HDMI display device with the power amplifier or audio interface by the HDMI interface that is preset by the calling program, so as to remind the driver.
A personal FM transmitter is a low-power FM radio transmitter that broadcasts a signal from a portable audio device (such as an MP3 player) to a standard FM radio. Most of these transmitters plug into the device's headphone jack and then broadcast the signal over an FM broadcast band frequency, so that it can be picked up by any nearby radio. This allows portable audio devices to make use of the louder or better sound quality of a home audio system or car stereo without requiring a wired connection. They are often used in cars but may also be in fixed locations such as broadcasting from a computer sound card throughout a building.
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