opencv opencv_contrib 4.1.2

[Douglas R. Reno]

New point version

[Bruce Dubbs]

Fall update for OpenCV 4.x has been released.

Highlights of this release:

DNN module:

Intel® Inference Engine backend (OpenVINO™):

• 2019R3 has been supported
• Support modern IE Core API
• New approach for custom layers management. Now all the OpenCV layers fallbacks are implemented as IE custom layers which helps to improve efficiency due less graph partitioning.

• High-level API which introduces dnn::Model class and set of task-specific classes such dnn::ClassificationModel, dnn::DetectionModel, dnn::SegmentationModel. It supports automatic pre- and post-processing for deep learning networks.

Performance improvements and platforms support:

• MSA SIMD implementation has been contributed for MIPS platforms: ​https://github.com/opencv/opencv/pull/15422
• OpenCV.js optimization (threading and SIMD as part of GSoC project): ​https://github.com/opencv/opencv/pull/15371
• More optimizations using SIMD intrinsics: dotProd, FAST corners, HOG, LK pyramid (VSX), norm, warpPerspective, etc
• Fixed detection of Cascade Lake CPUs

And many other great patches from OpenCV community:

• GUI: support topmost window mode (Win32/COCOA): ​https://github.com/opencv/opencv/pull/14872
• Java: fix Mat.toString() for higher dimensions: ​https://github.com/opencv/opencv/pull/15181
• Implementation of colormap "Turbo" ​https://github.com/opencv/opencv/pull/15388
• QR-Code detection accuracy improvement: ​https://github.com/opencv/opencv/pull/15356
• GSoC: Add learning-based super-resolution module: ​https://github.com/opencv/opencv_contrib/pull/2229 and ​https://github.com/opencv/opencv_contrib/pull/2231
• Detection accuracy improvement of the white marker aruco corners: ​https://github.com/opencv/opencv_contrib/pull/2236
• Added pattern generator tool for aruco: ​https://github.com/opencv/opencv_contrib/pull/2250
• and special thanks to @sturkmen72 for improvind and cleaning up code of samples/tutorials

Breaking changes:

• fixed values thresholding accuracy in calcHist()

[Bruce Dubbs]

Fixed at revision 22269.