我正在尝试创建一个应用程序，我将相机指向某个东西，应用程序将显示该对象的红色蓝色和绿色。我正在使用OpenCV库在android studio中开发应用程序。我已成功完成所有设置，可以转换直播视频的色彩空间。但是，我无法分别显示R，G和B值。 说实话，我不知道该怎么做。我已经完成了谷歌搜索，并在C ++中得到了一些帮助，但是对java没有太多帮助。
我的活动文件就是这个
package com.example.virus.bloodpressurereader;
import android.hardware.Camera;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.SurfaceView;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.JavaCameraView;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.dnn.Importer;
import org.opencv.imgproc.Imgproc;
public class VideoRecordingActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2{
//custom toolbar
private Toolbar toolbar;
//java camera view
JavaCameraView javaCameraView;
Mat mRgba, rgb_scale;
//callback loader
BaseLoaderCallback mCallBackLoader = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status){
case BaseLoaderCallback.SUCCESS:
javaCameraView.enableView();
break;
default:
super.onManagerConnected(status);
break;
}
}
};
public static String TAG="VideoRecordingActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_recording);
//custom toolbar
toolbar = (Toolbar)findViewById(R.id.nav_action);
setSupportActionBar(toolbar);
//connect the camera
javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view);
//set visibility
javaCameraView.setVisibility(SurfaceView.VISIBLE);
//set callback function
javaCameraView.setCvCameraViewListener(this);
}
@Override
protected void onPause() {
super.onPause();
if(javaCameraView!=null){
javaCameraView.disableView();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (javaCameraView!=null){
javaCameraView.disableView();
}
}
@Override
protected void onResume() {
super.onResume();
if (OpenCVLoader.initDebug()){
Log.d(TAG, "Connected");
//display when the activity resumed,, callback loader
mCallBackLoader.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}else{
Log.d(TAG, "Not connected");
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_3_0, this, mCallBackLoader);
}
}
@Override
public void onCameraViewStarted(int width, int height) {
//4 channel
mRgba = new Mat(height, width, CvType.CV_8UC4);
//rgb_scale = new Mat(height, width, CvType.CV_8UC1);
}
@Override
public void onCameraViewStopped() {
//release
mRgba.release();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
//get each frame from camera\
mRgba = inputFrame.rgba();
//Imgproc.cvtColor(mRgba, rgb_scale, Imgproc.COLOR_RGB2HSV);
return mRgba;
}
}
注意：我没有显示红色蓝色和绿色的文本视图，因为我希望只记录值。
答案 0 :(得分：0)
public class VideoRecordingActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2{
//custom toolbar
private Toolbar toolbar;
//java camera view
JavaCameraView javaCameraView;
Mat mRgba, mHsv;
//callback loader
BaseLoaderCallback mCallBackLoader = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status){
case BaseLoaderCallback.SUCCESS:
javaCameraView.enableView();
break;
default:
super.onManagerConnected(status);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_recording);
//custom toolbar
toolbar = (Toolbar)findViewById(R.id.nav_action);
setSupportActionBar(toolbar);
//connect the camera
javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view);
//set visibility
javaCameraView.setVisibility(SurfaceView.VISIBLE);
javaCameraView.setMaxFrameSize(320, 240);
javaCameraView.enableFpsMeter();
javaCameraView.clearFocus();
//set callback function
javaCameraView.setCvCameraViewListener(this);
}
@Override
protected void onPause() {
super.onPause();
if(javaCameraView!=null){
javaCameraView.disableView();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (javaCameraView!=null){
javaCameraView.disableView();
}
}
@Override
protected void onResume() {
super.onResume();
if (OpenCVLoader.initDebug()){
Log.d("openCV", "Connected");
//display when the activity resumed,, callback loader
mCallBackLoader.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}else{
Log.d("openCV", "Not connected");
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_3_0, this, mCallBackLoader);
}
}
@Override
public void onCameraViewStarted(int width, int height) {
//4 channel
mRgba = new Mat(width, height, CvType.CV_8UC4);
mHsv = new Mat(width, height, CvType.CV_8UC3);
}
@Override
public void onCameraViewStopped() {
//release
mRgba.release();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
//get each frame from camera
mRgba = inputFrame.rgba();
/**********HSV conversion**************/
//convert mat rgb to mat hsv
Imgproc.cvtColor(mRgba, mHsv, Imgproc.COLOR_RGB2HSV);
//find scalar sum of hsv
Scalar mColorHsv = Core.sumElems(mHsv);
int pointCount = 320*240;
//convert each pixel
for (int i = 0; i < mColorHsv.val.length; i++) {
mColorHsv.val[i] /= pointCount;
}
//convert hsv scalar to rgb scalar
Scalar mColorRgb = convertScalarHsv2Rgba(mColorHsv);
/*Log.d("intensity", "Color: #" + String.format("%02X", (int)mColorHsv.val[0])
+ String.format("%02X", (int)mColorHsv.val[1])
+ String.format("%02X", (int)mColorHsv.val[2]) );*/
//print scalar value
//Log.d("intensity", "R:"+ String.valueOf(mColorRgb.val[0])+" G:"+String.valueOf(mColorRgb.val[1])+" B:"+String.valueOf(mColorRgb.val[2]));
/*Convert to YUV*/
int R = (int) mColorRgb.val[0];
int G = (int) mColorRgb.val[1];
int B = (int) mColorRgb.val[2];
int Y = (int) (R * .299000 + G * .587000 + B * .114000);
int U = (int) (R * -.168736 + G * -.331264 + B * .500000 + 128);
int V = (int) (R * .500000 + G * -.418688 + B * -.081312 + 128);
//int I = (R+G+B)/3;
//Log.d("intensity", "I: "+String.valueOf(I));
//Log.d("intensity", "Y:"+ String.valueOf(Y)+" U:"+String.valueOf(U)+" V:"+String.valueOf(V));
/*calibration*/
return mRgba;
}
//convert Mat hsv to scalar
private Scalar convertScalarHsv2Rgba(Scalar hsvColor) {
Mat pointMatRgba = new Mat();
Mat pointMatHsv = new Mat(1, 1, CvType.CV_8UC3, hsvColor);
Imgproc.cvtColor(pointMatHsv, pointMatRgba, Imgproc.COLOR_HSV2RGB);
return new Scalar(pointMatRgba.get(0, 0));
}
}