OpenCV for Unity.zip.004

2.3.8 [Common]Updated to OpenCV4.2.0. [UWP]Added ARM64 Architecture. [WebGL]Added opencvforunity.bc with multi-threading enabled. [Common]Added FastNeuralStyleTransferExample and LibFaceDetectionExample. [Common]Added MatIndexer class and MatUtils class. [Common]Update ComicFilterExample, Vid