สวัสดีค่ะ อยากรบกวนผู้รู้ช่วยบอกวิธี ในการสร้างแอพลิเคชั่นให้ถ่ายรูปได้ และนำรูปที่ถ่ายได้ มาประมวลผลขั้นต่อไปค่ะ
ตอนนี้ สร้างให้กล้องรับรูปได้แล้ว แต่เรียกมาใช้ประมวลผลไม่ถูกค่ะ
คือจะเรียกมาอ่านค่าสี RGB ในแต่ละพิกเซลค่ะ
ปล. เขียนโดยภาษา JAVA โปรแกรม eclipse ค่ะ

นี้คือ code ที่ใช้ถ่ายภาพค่ะ


MainActivity.java
package com.example.testsquare;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Point;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */

    Camera mCamera = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        mCamera = getCameraInstance();
        Preview mPreview = new Preview(this, mCamera);
        FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
        preview.addView(mPreview);
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int screenCenterX = (size.x /2);
        int screenCenterY = (size.y/2) ;
        DrawOnTop mDraw = new DrawOnTop(this,screenCenterX,screenCenterY);
        addContentView(mDraw, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

        //Adding listener
        Button captureButton = (Button) findViewById(R.id.button_capture);
        captureButton.setOnClickListener(
                new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mCamera.takePicture(null, null, mPicture);

                }
            });
    }
    /**
     * Helper method to access the camera returns null if
     * it cannot get the camera or does not exist
     * @return
     */
    private Camera getCameraInstance() {
        Camera camera = null;

        try {
            camera = Camera.open();
        } catch (Exception e) {
            // cannot get camera or does not exist
        }
        return camera;
    }
    PictureCallback mPicture = new PictureCallback() {
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
             File pictureFile = getOutputMediaFile();
                if (pictureFile == null){
                    return;
                }
                try {
                    FileOutputStream fos = new FileOutputStream(pictureFile);
                    fos.write(data);
                    fos.close();
                    Toast.makeText(MainActivity.this, "Photo saved to folder \"sdcard0\\PicFromApp\"", Toast.LENGTH_SHORT).show();
                } catch (FileNotFoundException e) {

                } catch (IOException e) {

                }
        }
    };

    private static File getOutputMediaFile(){
        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                  Environment.DIRECTORY_PICTURES), "MyCameraApp");
        if (! mediaStorageDir.exists()){
            if (! mediaStorageDir.mkdirs()){
                Log.d("MyCameraApp", "failed to create directory");
                return null;
            }
        }
        // Create a media file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        File mediaFile;
            mediaFile = new File(mediaStorageDir.getPath() + File.separator +
            "IMG_"+ timeStamp + ".jpg");

        return mediaFile;
    }
}

class DrawOnTop extends View {
    int screenCenterX = 0;
    int screenCenterY = 0;
    final int radius = 100;
        public DrawOnTop(Context context, int screenCenterX, int screenCenterY) {
                super(context);
               this.screenCenterX = screenCenterX;
               this.screenCenterY = screenCenterY;
         }


        @Override
        protected void onDraw(Canvas canvas) {
                // TODO Auto-generated method stub
            Paint paint = new Paint();
            Paint p = new Paint();
             p.setColor(Color.RED);
             paint.setColor(Color.BLUE);
             DashPathEffect dashPath = new DashPathEffect(new float[]{5,5}, (float)1.0);
             p.setPathEffect(dashPath);
             p.setStyle(Style.STROKE);
             //paint.setPathEffect();
             paint.setStyle(Style.STROKE);
            
            // paint.setPathEffect();
             //paint.setColor(Color.TRANSPARENT);
            
             canvas.drawCircle(screenCenterX+400, screenCenterY-200, radius, p);
             canvas.drawCircle(screenCenterX+400, screenCenterY+200, radius, p);
             canvas.drawRect(50, 50, 500, 700, paint);
             invalidate();
             super.onDraw(canvas);
        }
    }

//----------------------------------------------------------------------

class Preview extends SurfaceView implements SurfaceHolder.Callback {
    SurfaceHolder mHolder;
    Camera mCamera;
    Preview(Context context, Camera camera) {
        super(context);
        // Install a SurfaceHolder.Callback so we get notified when
        this.mCamera = camera;
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
      //this is a deprecated method, is not required after 3.0
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, acquire the camera and tell
        // to draw.
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.startPreview();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // Surface will be destroyed when we return, so stop the
        // Because the CameraDevice object is not a shared resource,
        // important to release it when the activity is paused.
        mCamera.stopPreview();
        mCamera.release();
        mCamera = null;
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Now that the size is known, set up the camera parameters
        // the preview.
        Camera.Parameters parameters = mCamera.getParameters();
        List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
        // You need to choose the most appropriate previewSize for your app
        Camera.Size previewSize = previewSizes.get(0);
        parameters.setPreviewSize(previewSize.width, previewSize.height);
        mCamera.setParameters(parameters);
        mCamera.startPreview();
    }


}



Activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
  <FrameLayout
    android:id="@+id/camera_preview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    ></FrameLayout>

  <Button
    android:id="@+id/button_capture"
    android:text="Capture"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    ></Button>
</LinearLayout>


Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testsquare"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="13"
        android:targetSdkVersion="16" ></uses>
<uses-permission android:name="android.permission.CAMERA" ></uses>
<uses-feature android:name="android.hardware.camera" ></uses>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" ></uses>
    
    
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.testsquare.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" ></action>

                <category android:name="android.intent.category.LAUNCHER" ></category>
            </intent-filter>
        </activity>
    </application>

</manifest>