Android OpenCv 提取图像的RGB三原色分割图像Split Core.split

概述函数简析我们都知道，彩色图片每个像素点都对应三个值如[R,G,B]，Core.split()这个函数则是帮我们这三个值分开，即分别提取R，G，B各通道的灰度值效果演示代码解析activity_main.xml<?xmlversion="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.andr 函数简析

我们都知道，彩色图片每个像素点都对应三个值 如 [R,G,B]，Core.split()这个函数则是帮我们这三个值分开，即分别提取 R，G，B各通道的灰度值

效果演示

代码解析

activity_main.xml

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    xmlns:app="http://schemas.androID.com/apk/res-auto"    xmlns:tools="http://schemas.androID.com/tools"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:orIEntation="vertical"    tools:context=".MainActivity">    <ImageVIEw        androID:ID="@+ID/iv_img"        androID:layout_wIDth="match_parent"        androID:layout_height="300dp"/>    <linearLayout        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content">        <button            androID:ID="@+ID/btn_loadimg"            androID:layout_wIDth="0dp"            androID:layout_weight="1"            androID:layout_height="wrap_content"            androID:text="导入图片"/>    </linearLayout>    <linearLayout        androID:layout_wIDth="match_parent"        androID:layout_height="match_parent">        <ImageVIEw            androID:ID="@+ID/iv_img_one"            androID:layout_wIDth="0dp"            androID:layout_height="match_parent"            androID:layout_weight="1"/>        <ImageVIEw            androID:ID="@+ID/iv_img_two"            androID:layout_wIDth="0dp"            androID:layout_height="match_parent"            androID:layout_weight="1"/>        <ImageVIEw            androID:ID="@+ID/iv_img_three"            androID:layout_wIDth="0dp"            androID:layout_height="match_parent"            androID:layout_weight="1"/>    </linearLayout></linearLayout>

MainActivity

package com.wust.opencv0;import androIDx.annotation.Nullable;import androIDx.appcompat.app.AppCompatActivity;import androID.content.ContentResolver;import androID.content.Intent;import androID.graphics.Bitmap;import androID.graphics.BitmapFactory;import androID.net.Uri;import androID.os.Bundle;import androID.util.Log;import androID.vIEw.VIEw;import androID.Widget.button;import androID.Widget.ImageVIEw;import androID.Widget.TextVIEw;import org.opencv.androID.OpenCVLoader;import org.opencv.androID.Utils;import org.opencv.core.Core;import org.opencv.core.CvType;import org.opencv.core.Mat;import org.opencv.imgproc.imgproc;import java.io.fileNotFoundException;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity implements VIEw.OnClickListener {    // Used to load the 'native-lib' library on application startup.    static {        System.loadlibrary("native-lib");    }    private ImageVIEw iv_img;    private button btn_loadimg;    private Bitmap bitmap;    private List<ImageVIEw> imageVIEwList;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        iv_img = findVIEwByID(R.ID.iv_img);        btn_loadimg = findVIEwByID(R.ID.btn_loadimg);        ImageVIEw iv_img_one = findVIEwByID(R.ID.iv_img_one);        ImageVIEw iv_img_two = findVIEwByID(R.ID.iv_img_two);        ImageVIEw iv_img_three = findVIEwByID(R.ID.iv_img_three);        imageVIEwList = new ArrayList<>();        imageVIEwList.add(iv_img_one);        imageVIEwList.add(iv_img_two);        imageVIEwList.add(iv_img_three);        btn_loadimg.setonClickListener(this);    }    /**     * A native method that is implemented by the 'native-lib' native library,     * which is packaged with this application.     */    public native String stringFromJNI();    @OverrIDe    public voID onClick(VIEw v) {        switch(v.getID()){            case R.ID.btn_loadimg:                loadImage();                break;        }    }    private voID loadImage() {        Intent intent = new Intent();        intent.setType("image/*");        intent.setAction(Intent.ACTION_GET_CONTENT);        startActivityForResult(intent,1);    }    @OverrIDe    protected voID onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (resultCode == RESulT_OK){            try {                Uri uri = data.getData();                ContentResolver cr = getContentResolver();                bitmap = BitmapFactory.decodeStream(cr.openinputStream(uri));                iv_img.setimageBitmap(bitmap);                minMaxLoc(bitmap); //在这个地方调用了 minMaxLoc() 讲解Core.split()只是个小                                    //插曲,所以，函数命名看起来不是很规范            } catch (Exception e) {                Log.e("MainActivity",e.getMessage(),e);            }        }    }    @OverrIDe    protected voID onResume() {        super.onResume();        if (!OpenCVLoader.initDeBUG()){            Log.e("MainActivity","内置OpenCv没有找到，请下载OpenCV Manage");        }else {            Log.e("MainActivity","内置OpenCv找到了");        }    }    private voID minMaxLoc(Bitmap sorce){        Mat sorceMat = new Mat();        Utils.bitmapToMat(sorce,sorceMat);        List<Mat> bgrList = new ArrayList();        //最为关键的就是这句话，第一个参数：4通道图像对应的 Mat,第二个参数：装 Mat 的 List        Core.split(sorceMat,bgrList);          for (int i = 0; i < 3; i++) {  //因为 bgrList 里面有4个（包含透明度） 为了与                                        //imageVIEwList长度对                                        //应，所以写死了 为 3             Mat letMat = bgrList.get(i);            System.out.println("我被执行了" + letMat);            Bitmap letBitmap = Bitmap.createBitmap(letMat.wIDth(),letMat.height(), Bitmap.Config.ARGB_8888);            Utils.matToBitmap(letMat,letBitmap);            imageVIEwList.get(i).setimageBitmap(letBitmap);        }    }}

 

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