OpenCV摄像头方向问题
OpenCV摄像头方向问题
提问于 2013-05-21 20:15:05
我有一个简单的项目，只显示相机与org.opencv.android.JavaCameraView。
我的问题是，在默认情况下，相机处于横向模式，我无法更改这一点，因为我需要定义CameraBridgeViewBase而不是常规的相机意图。
这是我的代码的一部分：
XML代码：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<org.opencv.android.JavaCameraView
android:layout_width="fill_parent"
android:layout_height="300dp"
android:visibility="gone"
android:id="@+id/HelloOpenCvView"
opencv:show_fps="true"
opencv:camera_id="1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="@+id/BtnVideo"
android:layout_marginLeft="2dp"
android:layout_marginRight="2dp"
android:layout_width="0dp"
style="@style/button"
android:layout_height="wrap_content"
android:layout_weight="1.00"
android:text="@string/videoBtn"
android:textSize="18dip" />
</LinearLayout> Java代码：
CameraBridgeViewBase mOpenCvCameraView;
Button VideoButton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
overridePendingTransition(0, 0);
VideoButton = (Button) this.findViewById(R.id.BtnVideo);
VideoButton.setOnClickListener(onClickListener);
mOpenCvCameraView= (CameraBridgeViewBase) findViewById(R.id.HelloOpenCvView);
mOpenCvCameraView.setVisibility(SurfaceView.INVISIBLE);
}
private OnClickListener onClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.BtnVideo:
if(mOpenCvCameraView.getVisibility() == SurfaceView.VISIBLE)
{
mOpenCvCameraView.setVisibility(SurfaceView.INVISIBLE);
}
else
{
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
}
break;
default :
break;
}
}
};
public void onResume() {
super.onResume();
overridePendingTransition(0, 0);
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}
public void onPause()
{
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
public void onDestroy() {
super.onDestroy();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
public void onCameraViewStarted(int width, int height) {
}
public void onCameraViewStopped() {
}
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
return inputFrame.rgba();
}
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
{
//Log.i(TAG, "OpenCV loaded successfully");
mOpenCvCameraView.enableView();
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};那么我该如何更改默认方向呢？
谢谢!
Stack Overflow用户
发布于 2016-09-21 01:10:50
问题是，绘制的代码不检查相机参数。垫是在"CameraBridgeViewBase“类中的函数"deliverAndDrawFrame”中的曲面视图上绘制的。
只需在CameraBridgeViewBase类中进行非常简单的修改，我们就可以创建一个旋转绘制位图的函数。
int userRotation= 0;
public void setUserRotation(int userRotation) {
this.userRotation = userRotation;
}
/**
* This method shall be called by the subclasses when they have valid
* object and want it to be delivered to external client (via callback) and
* then displayed on the screen.
* @param frame - the current frame to be delivered
*/
protected void deliverAndDrawFrame(CvCameraViewFrame frame) {
Mat modified;
if (mListener != null) {
modified = mListener.onCameraFrame(frame);
} else {
modified = frame.rgba();
}
boolean bmpValid = true;
if (modified != null) {
try {
Utils.matToBitmap(modified, mCacheBitmap);
} catch(Exception e) {
Log.e(TAG, "Mat type: " + modified);
Log.e(TAG, "Bitmap type: " + mCacheBitmap.getWidth() + "*" + mCacheBitmap.getHeight());
Log.e(TAG, "Utils.matToBitmap() throws an exception: " + e.getMessage());
bmpValid = false;
}
}
if (bmpValid && mCacheBitmap != null) {
Canvas canvas = getHolder().lockCanvas();
if (canvas != null) {
canvas.drawColor(Color.parseColor("#8BC34A"), PorterDuff.Mode.SRC_IN);
//this is the rotation part
canvas.save();
canvas.rotate(userRotation, (canvas.getWidth()/ 2),(canvas.getHeight()/ 2));
if (mScale != 0) {
canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(), mCacheBitmap.getHeight()),
new Rect((int)((canvas.getWidth() - mScale*mCacheBitmap.getWidth()) / 2),
(int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2),
(int)((canvas.getWidth() - mScale*mCacheBitmap.getWidth()) / 2 + mScale*mCacheBitmap.getWidth()),
(int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2 + mScale*mCacheBitmap.getHeight())), null);
} else {
canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(), mCacheBitmap.getHeight()),
new Rect((canvas.getWidth() - mCacheBitmap.getWidth()) / 2,
(canvas.getHeight() - mCacheBitmap.getHeight()) / 2,
(canvas.getWidth() - mCacheBitmap.getWidth()) / 2 + mCacheBitmap.getWidth(),
(canvas.getHeight() - mCacheBitmap.getHeight()) / 2 + mCacheBitmap.getHeight()), null);
}
if (mFpsMeter != null) {
mFpsMeter.measure();
mFpsMeter.draw(canvas, 20, 30);
}
//remember to restore the canvas
canvas.restore();
getHolder().unlockCanvasAndPost(canvas);
}
}
}我尝试了最常见的解决方案，使用Core.flip函数旋转垫子，但消耗了大量资源，这种解决方案对检测没有影响，对性能也没有影响，只是改变了图像在画布上绘制的方式。
希望这能有所帮助。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/16669779
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