diff --git a/.gitignore b/.gitignore
index 911fd327c56aa34cfaa095db8ef756e68dda99c0..45f108620b1d399a57b839a45f5ef142ba46635b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,4 @@ bgslibrary_gui
 .pypirc
 upload.sh
 *.sublime-workspace
+README.html
diff --git a/examples/Demo.cpp b/examples/Demo.cpp
index c01770ced407e3763b2d56b3cb0dae9a89b7a60e..89b7d933d54c33f941c1d3c9dd65096911a053a2 100644
--- a/examples/Demo.cpp
+++ b/examples/Demo.cpp
@@ -33,6 +33,7 @@ using namespace cv;
 using namespace std;
 
 Scalar color_red( 0,0,255,255 );
+const int FILE_ERROR = -3;
 
 int g_badSignalFlagAbort = 0;
 
@@ -117,15 +118,15 @@ int main(int argc, char * argv[])
 	}
 
 	char *camerFile = getCmdOption(argv, argv + argc, "-p");
-	string cameraParameterFile(".");
+	string camParamFile(".");
 	if (camerFile)
 	{
 		//test dir exists
-		cameraParameterFile = string(camerFile);
+		camParamFile = string(camerFile);
 	}
 
 
-	cout << "args: -i " << inputFile << " -a " << amountFiles << " -c" << centerFileString << " -o " << outputDir << " -p " << cameraParameterFile << endl;
+	cout << "args: -i " << inputFile << " -a " << amountFiles << " -c" << centerFileString << " -o " << outputDir << " -p " << camParamFile << endl;
 	//!**** end parse input***********/
 
 	//libarchive things
@@ -215,31 +216,22 @@ int main(int argc, char * argv[])
 
 
 	//open camera config file
-	cv::String  camParam (cameraParameterFile);
-	// std::vector<int> intrinsicsCameraMatrix; // = {1000, 0, 320, 0, 1000, 240, 0, 0, 1};
-	// std::vector<double> distortionCoeff; // = {1000, 0, 320, 0, 1000, 240, 0, 0, 1};
-	Mat intrinsicsCameraMatrix; // = {1000, 0, 320, 0, 1000, 240, 0, 0, 1};
-	// Mat distortionCoeff; // = {0.1, 0.01, -0.001, 0, 0};
+	Mat distCoeffs;
+	Mat cameraMatrix;
 	{
-		cout  << "read cam parameter of: " << cameraParameterFile << endl;
-		FileStorage fs(camParam, FileStorage::READ);
+		std::string camParamFile = cameraParameterFile;
+		FileStorage fs(camParamFile, FileStorage::READ);
 		if (!fs.isOpened())
 		{
-			cerr << "error opening '" << cameraParameterFile << "' will abort" << endl;
-			return -1;
+			std::cerr << "error opening '" << camParamFile << "' will abort" << endl;
+			return FILE_ERROR;
 		}
-// Mat_<double>(3,3)
-// Mat_<double>(5,1)
-		fs["camera_matrix"] >> (Mat_<double>(3,3))intrinsicsCameraMatrix;
-		// fs["distortion_coefficients"] >> distortionCoeff;
 
-		// intrinsicsCameraMatrix = (int) fs["camera_matrix"];
-		// intrinsicsCameraMatrix = fs["camera_matrix"].mat();
-		// cout << "ISMAT?" << intrinsicsCameraMatrix.isMap() << endl;
-		// pp(intrinsicsCameraMatrix);
-		// pp(distortionCoeff);
+		fs["camera_matrix"] >>  cameraMatrix;
+		fs["distortion_coefficients"] >> distCoeffs;
 
-	}
+		cout <<	cameraMatrix << endl << distCoeffs << endl;
+	} //fs.release();
 
 	system( "echo 'sleep a bit... ' && sleep 12" );
 	exit(EXIT_SUCCESS);
@@ -322,7 +314,7 @@ int main(int argc, char * argv[])
 			//! step 0 correct lense distortion
 			Mat imgLenseCorrection = img_input.clone();
 			//see https://docs.opencv.org/2.4/modules/imgproc/doc/geometric_transformations.html#undistort
-			cv::undistort(img_input, imgLenseCorrection, intrinsicsCameraMatrix, distortionCoeff);
+			cv::undistort(img_input, imgLenseCorrection, cameraMatrix, distCoeffs);
 
 			//! step 1) cut out a smaller ROI
 			img_input = TToolBox::cropImageCircle(imgLenseCorrection,circleCenterX,circleCenterY,circleRadius);
diff --git a/opencv b/opencv
index a8f6d8f5af6686bc865343d9528cde2218953ef6..a93ce4da30e1e99d3098a97ea4260e2f28fe40b2 100644
--- a/opencv
+++ b/opencv
@@ -103,3 +103,14 @@ https://docs.opencv.org/4.x/d0/d49/tutorial_moments.html
 
 #BGS
 https://docs.opencv.org/4.x/d8/d38/tutorial_bgsegm_bg_subtraction.html
+
+
+
+# alliedvision-vimba-sdk
+#######################
+	AsynchronousGrab example > to use with opencv
+
+	/tmp/mozilla_sugu0/Vimba_installation_under_Linux-1.pdf
+
+	C-api
+	https://www.ansatt.hig.no/ares/Support/Camera%20drivers/AVT/Vimba/1.1/VimbaC/Documentation/Vimba%20C%20Manual.pdf