Android 识别车牌信息
package com.example.lprec;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Build;
import android.os.Bundle;
import android.util.AndroidException;
import android.util.Log;
import android.widget.Button;
import android.widget.CalendarView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.hyperai.hyperlpr3.HyperLPR3;
import com.hyperai.hyperlpr3.bean.HyperLPRParameter;
import com.hyperai.hyperlpr3.bean.Plate;
import java.io.IOException;
import java.io.InputStream;
public class MainActivity extends AppCompatActivity {
ImageView img = null;
TextView text = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
img = findViewById(R.id.rec_img_show);
text = findViewById(R.id.text_show);
Button button;
button = findViewById(R.id.rec_button);
initLoadLPR();
// 画布
Canvas canvas = new Canvas();
// 点击button'的点击事件
button.setOnClickListener(v -> {
Log.d("Test", "");
try (InputStream file = getAssets().open("lp1.jpg")) {
Bitmap lpImg = BitmapFactory.decodeStream(file);
Bitmap showImg = null;
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
showImg = Bitmap.createBitmap(lpImg.getWidth(), lpImg.getHeight(), Bitmap.Config.RGB_565, false);
}
if (showImg != null) {
canvas.setBitmap(showImg);
// 绘制画笔
Paint paint = new Paint();
paint.setStrokeWidth(2);//设置画笔宽为2
paint.setARGB(255, 255, 0, 0);
paint.setStyle(Paint.Style.STROKE);
// 绘制画笔到画布上
canvas.drawBitmap(lpImg, 0, 0, new Paint());
Plate[] plates = HyperLPR3.getInstance().plateRecognition(lpImg, HyperLPR3.CAMERA_ROTATION_0, HyperLPR3.STREAM_BGRA);
// 自定义字符串内容
StringBuilder builder = new StringBuilder();
for (int i = 0; i < plates.length; i++) {
Plate plate = plates[i];
canvas.drawRect(plate.getX1(), plate.getY1(), plate.getX2(), plate.getY2(), paint);
}
img.setImageBitmap(showImg);
text.setText(builder.toString());
}
} catch (IOException e) {
Toast.makeText(this, "图像加载失败了", Toast.LENGTH_SHORT).show();
}
});
}
private void initLoadLPR() {
// 配置HyperLPRParameter的车牌识别库，链式调用
HyperLPRParameter parameter = new HyperLPRParameter().
setDetLevel(HyperLPR3.DETECT_LEVEL_HIGH).//设置功耗等级
setBoxConfThreshold(0.5f);//设置最低功率，过滤白分别
// 初始化Hyper车牌识别库，创建单例类
HyperLPR3.getInstance().init(this, parameter);
}
}