应用medianBlur以及拉普拉斯和阈值滤波器

Applying medianBlur as well as Laplacian and threshold filters

本文关键字：阈值 滤波器 普拉斯 medianBlur 应用      更新时间：2023-10-16

我有一个函数，具有以下签名：

Mat cartoonifyImage( Mat, Mat );

我还有一个VS2010程序，如下所示，我将许多过滤器应用于网络摄像头流，如本书所示：掌握OpenCV

int main( int argc, const char** argv )
{
VideoCapture camera;
camera.open(0);
if( !camera.isOpened() )
{
cerr << "Could not access the camera!" << endl;
return  1;
}
while( true )
{
Mat cameraFrame;
camera >> cameraFrame;
if( cameraFrame.empty() )
{
cerr << "Could not grab a camera frame!" << endl;
return  1;
}
// imshow( "Camera Test", cameraFrame );
Mat displayedFrame( cameraFrame.size(), CV_8UC3 );
cartoonifyImage( cameraFrame, displayedFrame );
imshow( "Cartoonifier!", displayedFrame );
int keypress = waitKey( 20 );
if( keypress == 27 ) break;
}
}

这是我的函数定义：

Mat cartoonifyImage( Mat srcColor, Mat mask )
{
Mat gray, edges;
cvtColor( srcColor, gray, CV_BGR2GRAY );
const int MEDIAN_BLUR_FILTER_SIZE = 7;
const int LAPLACIAN_FILTER_SIZE = 5;
const int EDGES_THRESHOLD = 80;
medianBlur( gray, gray, MEDIAN_BLUR_FILTER_SIZE );
Laplacian( gray, edges, CV_8U, LAPLACIAN_FILTER_SIZE );
threshold( edges, mask, EDGES_THRESHOLD, 255, THRESH_BINARY_INV );
return( mask );
}

当我运行程序时，我会得到一个空白(灰色)窗口。在第一个imshow被注释掉的地方，我确保网络摄像头正常工作，并且我可以在窗口中看到我自己的图像，所以问题一定在其他地方。有人能帮我了解问题出在哪里以及我做错了什么吗？

谢谢你，

您显示的帧从未被填充。

(你把它传递到函数中，它在那里被操纵，但由于你给了它一个副本，你就无法得到结果)

或者从卡通图片中返回垫子：

Mat displayed = cartoonifyImage( cameraFrame );

或通过参考：

void cartoonifyImage( const Mat & cameraFrame, Mat & displayedFrame );

Mat cartoonifyImage( Mat srcColor )
{
Mat gray, edges, mask;
cvtColor( srcColor, gray, CV_BGR2GRAY );
const int MEDIAN_BLUR_FILTER_SIZE = 7;
const int LAPLACIAN_FILTER_SIZE = 5;
const int EDGES_THRESHOLD = 80;
medianBlur( gray, gray, MEDIAN_BLUR_FILTER_SIZE );
Laplacian( gray, edges, CV_8U, LAPLACIAN_FILTER_SIZE );
threshold( edges, mask, EDGES_THRESHOLD, 255, THRESH_BINARY_INV );
return ( mask );
}
int main( int argc, const char** argv )
{
VideoCapture camera;
camera.open(0);
if( !camera.isOpened() )
{
cerr << "Could not access the camera!" << endl;
return  1;
}
while( true )
{
Mat cameraFrame;
camera >> cameraFrame;
if( cameraFrame.empty() )
{
cerr << "Could not grab a camera frame!" << endl;
return  1;
}
//imshow( "Camera Test", cameraFrame );
Mat displayedFrame( cameraFrame.size(), CV_8UC3 );
displayedFrame = cartoonifyImage(cameraFrame);
imshow( "Cartoonifier!", displayedFrame );
int keypress = waitKey( 20 );
if( keypress == 27 ) break;
}
}
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