Version 2.2.7 [Common]Updated to OpenCV3.4.1. [Common]Added OpenPoseExample, KalmanFilterExample, ArUcoCameraCalibrationExample. [Common]Fixed VideoWriterExample, VideoCaptureExample, ImwriteScreenCaptureExample, CamShiftExample, TrackingExample, HandPoseEstimationExample, ArUcoCreateMarkerExample, ArUcoExample, ArUcoWebCamTextureExample. [Common] Updated to WebCamTextureToMatHelper.cs v1.0.6.

Version 2.3.9 [Common]Updated to OpenCV4.3.0. [Common]Added LibFaceDetectionV2Example, LibFaceDetectionV3Example, ColorizationExample and DocumentScannerExample. [Common]Update ArUcoCameraCalibrationExample and WrapPerspectiveExample.

Version 2.1.7[Common]Improved Utils.getFilePath() and Utils.getFilePathAsync().[Common]Improved WebCamTextureAsyncDetectFaceExample.cs.[Common] Fixed the const value of Calib3d class.