範例load image from resource (raw)

1. create new project(OpenCVLibTest)| Blank Activity| OpenCVLib

Application name: OpenCVLibTest

Activity: OpenCVLib

2. import openCVLib300.lib

3. create raw folder in android studio| res

4. copy image from your folder (ctrl+c) and paste on android studio| res|raw (ctrl+v)

5. remove TextView

6. add ImageView

layout:width	match parent
layout:height	match parent
id	igv

7. add member data in OpenCVLibActivity class

ImageView mIgv;
Mat srcBGR, srcRGBA;

8. add code in onCreate()

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_open_cvlib);

 mIgv = (ImageView) findViewById(R.id.igv);
 // you cannot use any opencv - related code, until the manager finished loading.
 try {
 srcBGR = Utils.loadResource(OpenCVLibActivity.this, R.raw.anderson);
 } catch (IOException e) {
 e.printStackTrace();
 }
 srcRGBA = new Mat(); //RGBA format
 Imgproc.cvtColor(srcBGR, srcRGBA, Imgproc.COLOR_BGR2RGBA);
 Bitmap bm = Bitmap.createBitmap(srcRGBA.cols(), srcRGBA.rows(),Bitmap.Config.ARGB_8888);
 Utils.matToBitmap(srcRGBA, bm);
 mIgv.setImageBitmap(bm);
}

9. build and run

error message:

09-18 22:19:25.537  28692-28692/com.example.home.opencvlibtest I/art﹕ Late-enabling -Xcheck:jni

09-18 22:19:25.716  28692-28692/com.example.home.opencvlibtest V/Monotype﹕ SetAppTypeFace- try to flip, app = com.example.home.opencvlibtest

09-18 22:19:25.716  28692-28692/com.example.home.opencvlibtest V/Monotype﹕ Typeface getFontPathFlipFont - systemFont = default

09-18 22:19:25.736  28692-28692/com.example.home.opencvlibtest V/Monotype﹕ SetAppTypeFace- try to flip, app = com.example.home.opencvlibtest

09-18 22:19:25.737  28692-28692/com.example.home.opencvlibtest V/Monotype﹕ Typeface getFontPathFlipFont - systemFont = default

09-18 22:19:25.816  28692-28692/com.example.home.opencvlibtest E/art﹕ No implementation found for long org.opencv.core.Mat.n_Mat(int, int, int) (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__III)

09-18 22:19:25.817  28692-28692/com.example.home.opencvlibtest D/AndroidRuntime﹕ Shutting down VM

09-18 22:19:25.817  28692-28692/com.example.home.opencvlibtest E/AndroidRuntime﹕ FATAL EXCEPTION: main

    Process: com.example.home.opencvlibtest, PID: 28692

    java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat(int, int, int) (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__III)

            at org.opencv.core.Mat.n_Mat(Native Method)

            at org.opencv.core.Mat.(Mat.java:37)

            at org.opencv.android.Utils.loadResource(Utils.java:66)

            at org.opencv.android.Utils.loadResource(Utils.java:51)

            at com.example.home.opencvlibtest.OpenCVLibActivity.onCreate(OpenCVLibActivity.java:48)

            at android.app.Activity.performCreate(Activity.java:6018)

            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)

            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2273)

            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2380)

            at android.app.ActivityThread.access$800(ActivityThread.java:151)

            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1285)

            at android.os.Handler.dispatchMessage(Handler.java:102)

            at android.os.Looper.loop(Looper.java:135)

            at android.app.ActivityThread.main(ActivityThread.java:5289)

            at java.lang.reflect.Method.invoke(Native Method)

            at java.lang.reflect.Method.invoke(Method.java:372)

            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)

            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)

10. google 一下

http://stackoverflow.com/questions/17860472/android-opencv-utils-bitmaptomat-crashes

you cannot use any opencv - related code, until the manager finished loading 

代表onCreate()中的opencv manager還沒有載入，就使用opencv function.

11. 修改code

remove code from onCreate()

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_open_cvlib);

 mIgv = (ImageView) findViewById(R.id.igv);
 // you cannot use any opencv - related code, until the manager finished loading.
}

add code in onManagerConnected()

@Override
public void onManagerConnected(int status) {
    switch (status) {
        case LoaderCallbackInterface.SUCCESS:
 try {
 srcBGR = Utils.loadResource(OpenCVLibActivity.this, R.raw.anderson);
 } catch (IOException e) {
 e.printStackTrace();
 }
 srcRGBA = new Mat(); //RGBA format
 Imgproc.cvtColor(srcBGR, srcRGBA, Imgproc.COLOR_BGR2RGBA);
 Bitmap bm = Bitmap.createBitmap(srcRGBA.cols(), srcRGBA.rows(),Bitmap.Config.ARGB_8888);
 Utils.matToBitmap(srcRGBA, bm);
 mIgv.setImageBitmap(bm);
 break;
 default:
            super.onManagerConnected(status);
 }
}

12. build and run

13. opencv load image from resource(raw)

google一下

http://stackoverflow.com/questions/8637316/correct-way-to-convert-between-bitmap-and-mat-in-opencv-on-android 

參考opencv online document:

loadResource

public static Mat loadResource(Context context,
               int resourceId)
                        throws java.io.IOException

Throws:

java.io.IOException

srcBGR = Utils.loadResource(OpenCVLibActivity.this, R.raw.anderson);

opencv load image的format是BGR, 但是ImageView接受的是RGBA format. 所以需要做color 轉換

Imgproc.cvtColor(srcBGR,srcRGBA,Imgproc.COLOR_BGR2RGBA);

如果沒有做轉換，其結果如下

ImageView無法接收Mat資料型態，必須要轉換

Bitmap bm=Bitmap.createBitmap(srcRGBA.cols(),srcRGBA.rows(),Bitmap.Config.ARGB_8888);
Utils.matToBitmap(srcRGBA,bm);

sample code:

ImageView mIgv;
Mat srcBGR, srcRGBA;

        mIgv = (ImageView) findViewById(R.id.igv);
 try {
        srcBGR = Utils.loadResource(OpenCVLibActivity.this, R.raw.anderson);
 } catch (IOException e) {
        e.printStackTrace();
 }
        srcRGBA = new Mat(); //RGBA format
 Imgproc.cvtColor(srcBGR, srcRGBA, Imgproc.COLOR_BGR2RGBA);
 Bitmap bm = Bitmap.createBitmap(srcRGBA.cols(), srcRGBA.rows(),Bitmap.Config.ARGB_8888);
 Utils.matToBitmap(srcRGBA, bm);
 mIgv.setImageBitmap(bm);

完整的source code:

OpenCVActivity.java

package com.example.home.opencvlibtest;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;

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.imgproc.Imgproc;

import java.io.IOException;

public class OpenCVLibActivity extends Activity {

    ImageView mIgv;
 Mat srcBGR, srcRGBA;
 private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
 public void onManagerConnected(int status) {
            switch (status) {
                case LoaderCallbackInterface.SUCCESS:
                    try {
                        srcBGR = Utils.loadResource(OpenCVLibActivity.this, R.raw.anderson);
 } catch (IOException e) {
                        e.printStackTrace();
 }
                    srcRGBA = new Mat(); //RGBA format
 Imgproc.cvtColor(srcBGR, srcRGBA, Imgproc.COLOR_BGR2RGBA);
 Bitmap bm = Bitmap.createBitmap(srcRGBA.cols(), srcRGBA.rows(),Bitmap.Config.ARGB_8888);
 Utils.matToBitmap(srcRGBA, bm);
 mIgv.setImageBitmap(bm);
 break;
 default:
                    super.onManagerConnected(status);
 }
        }
    };
 @Override
 public void onResume() {
        super.onResume();
 //Internal OpenCV library not found. Using OpenCV Manager for initialization
 OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
 }
    @Override
 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_open_cvlib);

 mIgv = (ImageView) findViewById(R.id.igv);
 // you cannot use any opencv - related code, until the manager finished loading.
 }

    @Override
 public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.menu_open_cvlib, menu);
 return true;
 }

    @Override
 public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
 // automatically handle clicks on the Home/Up button, so long
 // as you specify a parent activity in AndroidManifest.xml.
 int id = item.getItemId();

 //noinspection SimplifiableIfStatement
 if (id == R.id.action_settings) {
            return true;
 }

        return super.onOptionsItemSelected(item);
 }
}

activity_open_cvlib.xml

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:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".OpenCVLibActivity">

  android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:id="@+id/igv"
 android:layout_alignParentTop="true"
 android:layout_alignParentStart="true" />

AndroidManifest.xml

xml version="1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.home.opencvlibtest" >

  android:allowBackup="true"
 android:icon="@mipmap/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
  android:name=".OpenCVLibActivity"
 android:label="@string/app_name" >
 
 android:name="android.intent.action.MAIN" />

 android:name="android.intent.category.LAUNCHER" />
 
 
 

build.gradle (Module:app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
 buildToolsVersion "23.0.0"

 defaultConfig {
        applicationId "com.example.home.opencvlibtest"
 minSdkVersion 21
 targetSdkVersion 23
 versionCode 1
 versionName "1.0"
 }
    buildTypes {
        release {
            minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile project(':openCVLibrary300')
}

補充:

使用機台: ASUS ZE500KL 8916 64-bit CPU and 64-bit OS

配合使用機台，採用OpenCV_3.0.0_Manager_3.00_arm64-v8a.apk

參考: https://developer.android.com/ndk/guides/abis.html

其中arm64-v8a 代表使用AArch64（ARMv8）, 使用64-bit 指令處理