2015/10/13

Android OpenCV putText

最近的案子要即時去取得RGB，不過先試試看OpenCV寫在Android上的範本
使用OpenCV前手機必須安裝OpenCV Manager，且必須進行初始化
安裝OpenCV可以從Google play上進行安裝或者用adb的方式將OpenCV-android-sdk\apk底下的apk安裝進去

XML：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.test.MainActivity" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true" />

</RelativeLayout>



Code：
package com.example.test;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
 private ImageView imageView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  imageView = (ImageView) findViewById(R.id.imageView1);

  // 初始化OpenCV,版本為3.0.0
  OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, baseLoaderCallback);
 }

 private BaseLoaderCallback baseLoaderCallback = new BaseLoaderCallback(this) {

  @Override
  public void onManagerConnected(int status) {
   if (status == LoaderCallbackInterface.SUCCESS) {
    Mat mat = new Mat();

    // 取得imageView大小
    Bitmap bitmap = Bitmap.createBitmap(imageView.getWidth(), imageView.getHeight(), Bitmap.Config.RGB_565);

    // 將Bitmap轉成Mat
    Utils.bitmapToMat(bitmap, mat);

    // 寫入文字C.Y.Fang, 位置, 字體, 字體比例, 字體顏色
    Imgproc.putText(mat, "C.Y.Fang", new Point(100, 100), 3, 1, new Scalar(0, 100, 100));
    Bitmap bm = bitmap;

    // 將Map轉Bitmap
    Utils.matToBitmap(mat, bm);

    // 設定給ImageView
    imageView.setImageBitmap(bm);

   } else {
    Toast.makeText(getApplicationContext(), "載入失敗", 1).show();
    super.onManagerConnected(status);
   }

  }

 };
}


執行結果：

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