Android Studio配置JavaCPP Presets for OpenCV

通过使用JavaCV，无需复杂的配置就可调用OpenCV_Contrib中的算法，比较方便。而OpenCV官方目前是不提供For Android扩展包下载的。

一、配置Jar文件方式

参考 https://www.jianshu.com/p/7f9d31839b8f

1. 下载jar

在http://bytedeco.org/download/下载

Android Studio配置JavaCPP Presets for OpenCV

解压

2. 在Android Studio中新建项目

3. 将以下文件复制到"\app\libs"文件夹下

Android Studio配置JavaCPP Presets for OpenCV

4. 右键“app”->“Open ModuleSettings”->选择“Dependencies”->点击“+” ->选择“2 Jar Dependency”, 将刚才复制的".jar"文件添加进去。

5. 在"app/build.gradle"中添加如下代码

packagingOptions {
    exclude 'META-INF/services/javax.annotation.processing.Processor'
    pickFirst 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.properties'
    pickFirst 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.xml'
    pickFirst 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.properties'
    pickFirst 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.xml'
}

6. 测试代码

package com.javacvtest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.widget.ImageView;

import org.bytedeco.javacpp.opencv_core;
import org.bytedeco.javacpp.opencv_core.IplImage;
import org.bytedeco.javacpp.opencv_imgproc;
import org.bytedeco.javacpp.opencv_ximgproc;
import org.bytedeco.javacv.AndroidFrameConverter;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.OpenCVFrameConverter;

// 静态成员变量必须 static导入.
import static org.bytedeco.javacpp.opencv_core.IPL_DEPTH_8U;

public class MainActivity extends AppCompatActivity
{

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

        ImageView imageView = (ImageView) findViewById(R.id.img1);

        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.i1);
        IplImage iplImage = this.bitmapToIplImage(bitmap);

        AndroidFrameConverter converterToBitmap = new AndroidFrameConverter();
        OpenCVFrameConverter.ToIplImage converterToIplImage = new OpenCVFrameConverter.ToIplImage();
        OpenCVFrameConverter.ToMat converterToMat = new OpenCVFrameConverter.ToMat();

        // Bitmap 转 Frame
        Frame frame = converterToBitmap.convert(bitmap);
        // Frame 转 Mat
        opencv_core.Mat mat = converterToIplImage.convertToMat(frame);
        // 灰度化
        opencv_imgproc.cvtColor(mat, mat, opencv_imgproc.COLOR_RGB2GRAY);
        opencv_core.Mat mat1 = new opencv_core.Mat();
        // SAUVOLA二值化(扩展包算法)
        opencv_ximgproc.niBlackThreshold(mat, mat1, 255, opencv_ximgproc.BINARIZATION_SAUVOLA, 5, 0.5, opencv_imgproc.THRESH_BINARY);
        // Mat 转 Frame
        Frame frame1 = converterToMat.convert(mat1);
        // Frame 转 Bitmap
        Bitmap bitmap1 = converterToBitmap.convert(frame1);
        imageView.setImageBitmap(bitmap1);

        mat.release();
        mat1.release();
    }
    /**
     * IplImage转化为Bitmap
     * @param iplImage
     * @return
     */
    public Bitmap IplImageToBitmap(opencv_core.IplImage iplImage) {
        Bitmap bitmap = null;
        bitmap = Bitmap.createBitmap(iplImage.width(), iplImage.height(),
                Bitmap.Config.ARGB_8888);
        bitmap.copyPixelsFromBuffer(iplImage.getByteBuffer());
        return bitmap;
    }

    /**
     * Bitmap转化为IplImage
     * @param bitmap
     * @return
     */
    public opencv_core.IplImage bitmapToIplImage(Bitmap bitmap) {
        opencv_core.IplImage iplImage;
        iplImage = IplImage.create(bitmap.getWidth(), bitmap.getHeight(),
                IPL_DEPTH_8U, 4);
        bitmap.copyPixelsToBuffer(iplImage.getByteBuffer());
        return iplImage;
    }

    /**
     * 将资源ID转化为Drawable
     * @param id
     * @return
     */
    public Drawable idToDrawable(int id) {
        return this.getResources().getDrawable(id);
    }

    /**
     * 将Drawable转化为Bitmap
     * @param drawable
     * @return
     */
    public Bitmap drawableToBitmap(Drawable drawable) {
        if(drawable == null)
            return null;
        return ((BitmapDrawable)drawable).getBitmap();
    }
}

二、 Gradle方式

1. 在Android Studio中新建项目

2. 在"app/build.gradle"中添加如下代码

compile 'org.bytedeco:javacv:1.4'
compile 'org.bytedeco.javacpp-presets:opencv:3.4.0-1.4:android-arm'

3. 测试代码

测试代码同方法一

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Android Studio配置JavaCPP Presets for OpenCV

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