上篇文章介绍了身份证识别,现在我们来说说关于车牌识别。
EasyPR是一个开源的中文车牌识别系统,gitHub地址
EasyPR有如下特点:
1. 它基于openCV这个开源库,这意味着所有它的代码都可以轻易的获取。
2. 它能够识别中文。例如车牌为苏EUK722的图片,它可以准确地输出std:string类型的”苏EUK722”的结果。
3. 它的识别率较高。目前情况下,字符识别已经可以达到90%以上的精度。
使用方法
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package com.android.guocheng.easypr; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.fosung.libeasypr.view.EasyPRPreSurfaceView; import com.fosung.libeasypr.view.EasyPRPreView; public class MainActivity extends AppCompatActivity { private EasyPRPreView easyPRPreView; private Button btnShutter; private TextView text; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); easyPRPreView = (EasyPRPreView) findViewById(R.id.preSurfaceView); btnShutter = (Button) findViewById(R.id.btnShutter); text = (TextView) findViewById(R.id.text); initListener(); } @Override protected void onStart() { super .onStart(); if (easyPRPreView != null ) { easyPRPreView.onStart(); } } @Override protected void onStop() { super .onStop(); if (easyPRPreView != null ) { easyPRPreView.onStop(); } } @Override protected void onDestroy() { super .onDestroy(); if (easyPRPreView != null ) { easyPRPreView.onDestroy(); } } private void initListener() { easyPRPreView.setRecognizedListener( new EasyPRPreSurfaceView.OnRecognizedListener() { @Override public void onRecognized(String result) { if (result == null || result.equals( "0" )) { Toast.makeText(MainActivity. this , "换个姿势试试!" , Toast.LENGTH_SHORT).show(); } else { Toast.makeText(MainActivity. this , "识别成功" , Toast.LENGTH_SHORT).show(); text.setText(result); } } }); btnShutter.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View view) { easyPRPreView.recognize(); //开始识别 } }); } } |
布局文件
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<? xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:layout_height = "match_parent" android:background = "#00000000" > < com.fosung.libeasypr.view.EasyPRPreView android:id = "@+id/preSurfaceView" android:layout_width = "match_parent" android:layout_height = "match_parent" /> < Button android:id = "@+id/btnShutter" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_alignParentBottom = "true" android:layout_centerHorizontal = "true" android:layout_marginBottom = "10dp" android:text = "识别" android:textSize = "16sp" android:textColor = "#FFFFFF" android:background = "@color/colorAccent" /> < TextView android:id = "@+id/title" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_marginTop = "15dp" android:gravity = "center" android:textColor = "#FFFFFF" android:textSize = "16dp" android:text = "请将车牌放入框内" /> < TextView android:id = "@+id/text" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_marginTop = "5dp" android:gravity = "center" android:textColor = "#FFFFFF" android:textSize = "18dp" android:layout_below = "@+id/title" /> </ RelativeLayout > |
别忘了在manifest加入摄像机权限<uses-permission android:name="android.permission.CAMERA" />
app在运行时,有车牌限定框,在框的范围内进行图像裁剪,人为缩小了识别范围,提高识别度。
本库基于EasyPR_Android。
效果图:
最后附上demo源码
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/gc4868142/article/details/72874664