zoukankan      html  css  js  c++  java
  • 树莓派超声波车牌识别系统

    树莓派车牌识别系统

    Image

    本系统使用树莓派4B

    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    
    from luma.core.interface.serial import i2c, spi
    from luma.core.render import canvas
    from luma.oled.device import ssd1306, ssd1325, ssd1331, sh1106
    from luma.core.virtual import terminal
    import os
    import time
    from PIL import ImageFont
    
    from aip import AipOcr
    from picamera import PiCamera
    from time import sleep
    
    #导入 GPIO库
    import RPi.GPIO as GPIO
    import time
      
    #设置 GPIO 模式为 BCM
    GPIO.setmode(GPIO.BCM)
      
    #定义 GPIO 引脚
    GPIO_TRIGGER = 27
    GPIO_ECHO = 17
      
    #设置 GPIO 的工作方式 (IN / OUT)
    GPIO.setwarnings(False)
    GPIO.setup(GPIO_TRIGGER, GPIO.OUT)
    GPIO.setup(GPIO_ECHO, GPIO.IN)
     
    serial = i2c(port=1, address=0x3C)
    device = sh1106(serial)
    APP_ID = 'XXX'
    API_KEY = 'YYY'
    SECRET_KEY = 'ZZZ'
    
    client = AipOcr(APP_ID, API_KEY, SECRET_KEY)
    
    def make_font(name, size):
        font_path = os.path.abspath(os.path.join(
            os.path.dirname(__file__), 'fonts', name))
        return ImageFont.truetype(font_path, size, encoding="utf-8")
    
    font = make_font("/home/pi/Python/1602/msyh.ttc", 20)
    
    def distance():
        # 发送高电平信号到 Trig 引脚
        GPIO.output(GPIO_TRIGGER, True)
      
        # 持续 10 us 
        time.sleep(0.00001)
        GPIO.output(GPIO_TRIGGER, False)
      
        start_time = time.time()
        stop_time = time.time()
      
        # 记录发送超声波的时刻1
        while GPIO.input(GPIO_ECHO) == 0:
            start_time = time.time()
      
        # 记录接收到返回超声波的时刻2
        while GPIO.input(GPIO_ECHO) == 1:
            stop_time = time.time()
      
        # 计算超声波的往返时间 = 时刻2 - 时刻1
        time_elapsed = stop_time - start_time
        # 声波的速度为 343m/s, 转化为 34300cm/s。
        distance = (time_elapsed * 34300) / 2
        print("距离 = {:.2f} cm".format(distance))
      
        return distance
    
    def i2c_12864_print(x,y,text):
        with canvas(device) as draw:
            draw.text((x, y), text, fill="white", font=font)
            
    def get_file_content(filePath):
        with open(filePath, 'rb') as fp:
            return fp.read()
        
    while True:    
        print("测量长度")
        csblength = distance()
    
        if csblength < 200:
            print("程序开始,拍摄照片")
            camera = PiCamera()
            camera.resolution = (1024, 768)
            camera.start_preview()
            camera.capture('/home/pi/Python/1602/image.jpg')
            camera.stop_preview()
            print("拍摄结束")
                
    
    
            image = get_file_content('image.jpg')
    
             
            result = client.licensePlate(image);
            print(result);
            carNumber = result["words_result"]["number"]
             
            i2c_12864_print(0,0,carNumber)
            break
        sleep(1)
  • 相关阅读:
    《牛客IOI周赛17提高组A》
    《Codeforces Round #645 (Div. 2)》
    《AtCoder Beginner Contest 168 E》思路详解
    《东华大学2020年程序设计竞赛题解》
    《牛客直播课习题1》
    《Codeforces Round #643 (Div. 2)》
    《TOJ5945》区间覆盖问题。
    解决方案、项目、程序集、命名空间
    SQL存储过程前面后面的几句代码是什么意思?
    无法将类型为“IList”的对象强制转换为类型“System.Data.DataRowView” 。的解决方法
  • 原文地址:https://www.cnblogs.com/kawayidamiao/p/13843715.html
Copyright © 2011-2022 走看看