从一个Mat复制到另一个Mat只有近乎黑色的像素 [英] Copy from one Mat to another Mat only nearly black pixels
本文介绍了从一个Mat复制到另一个Mat只有近乎黑色的像素的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有 Mat差异它有一些黑色像素（或者真的几乎是黑色像素 - >如果发生了地震，建筑会移动等等）并且 Mat current ，包含自然色的真实图像。我想用 Mat差异中的这些黑色像素替换 Mat current 中的像素。如果我这样手动执行：
I have Mat difference which has some black pixels(or really nearly black pixels -> if earhquake occurs, buliding will move etc.) in it and the Mat current which consists real image with natural colors. I would like to replace pixels in Mat current with these black pixels in Mat difference. If I do it manually like this:
for(int i = 0; i < difference.rows(); i++){
for(int j = 0; j < difference.cols(); j++){
subtractedPixel = difference.get(i, j);
if(subtractedPixel[0] < 10 && subtractedPixel[1] < 10 && subtractedPixel[2] < 10){
originalPixel = current.get(i, j);
difference.put(i, j, originalPixel);
}
}
非常慢。
完整代码（正在运行）：
Full code(running):
package com.example.szpieg2;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Range;
import org.opencv.core.Size;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.Window;
import android.view.WindowManager;
public class TrackActivity extends Activity implements CvCameraViewListener {
private Mat current;
private CameraBridgeViewBase cameraView;
private Mat previous;
private Mat difference;//difference between previous and current
private boolean first = true;
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS: {
Log.i("Co sie dzieje?", "OpenCV loaded successfully");
cameraView.enableView();
// cameraView.setOnTouchListener(ColorBlobDetectionActivity.this);
}
break;
default: {
super.onManagerConnected(status);
}
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setContentView(R.layout.activity_track);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
cameraView = (CameraBridgeViewBase) findViewById(R.id.surface_view);
cameraView.setCvCameraViewListener(this);
}
// --------Activity Actions---------
@Override
public void onPause() {
if (cameraView != null)
cameraView.disableView();
super.onPause();
}
@Override
public void onResume() {
super.onResume();
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this,
mLoaderCallback);
}
public void onDestroy() {
super.onDestroy();
if (cameraView != null)
cameraView.disableView();
}
// --------/Activity Actions/---------
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_track, menu);
return true;
}
// --------listener method implementation-------------
@Override
public void onCameraViewStarted(int width, int height) {
/*current = new Mat(width, height, CvType.CV_64FC4);
previous = new Mat(width, height, CvType.CV_64FC4);
difference = new Mat(width, height, CvType.CV_64FC4);*/
current = new Mat(width, height, CvType.CV_8UC4);
previous = new Mat(width, height, CvType.CV_8UC4);
difference = new Mat(width, height, CvType.CV_8UC4);//RGBA 0..255
}
@Override
public void onCameraViewStopped() {
current.release();
}
@Override
public Mat onCameraFrame(Mat inputFrame) {
inputFrame.copyTo(current);
if(first){//first is true at the first time
inputFrame.copyTo(previous);
first = false;
Log.i("First processing", "Pierwszy przebieg");
}
Core.absdiff(current, previous, difference);
// Core.absdiff( previous,current, difference);
//I leave black pixels and load original colors
double[] subtractedPixel, originalPixel;
String s = "";
for(int i = 0; i < difference.rows(); i++){
for(int j = 0; j < difference.cols(); j++){
subtractedPixel = difference.get(i, j);
if(subtractedPixel[0] < 10 && subtractedPixel[1] < 10 && subtractedPixel[2] < 10){
originalPixel = previous.get(i, j);
difference.put(i, j, originalPixel);
}
}
// s+="\n";
}
// Log.i("mat ", s);
// Log.i("mat ", difference.get(44,444)[0] + "");
//---------------------------------------------
inputFrame.copyTo(previous);
return difference;//UNREAL COLORS
}
}
推荐答案
您可以执行以下操作。
Mat mask;
void inRange(difference, Scalar(0,0,0), Scalar(9,9,9), mask)
输出掩码将是一个二进制掩码，如果其像素低于阈值 cv :: Scalar，则其像素设置为255 （9,9,9）;
The output mask will be a binary mask where its pixel is set to 255 if its under threshold cv::Scalar(9,9,9);
将差异图像复制到当前图像通过掩码使用 copyTo（） 。
Copy difference image into current image through mask using copyTo().
difference.copyTo(current, mask);
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