Adjusted OpenCV for Hololens UWP build

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Build tested on Windows 10.0.14986 (AMD64) with VS2015 Community Edition

For convenience I'm including 'Release' binaries in \opencv-hololens\release_binaries.7z but I'm not going to update it. So it is preferable to work out the build yourself if you want to sync up with main opencv trunk.

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Nuget package: https://www.nuget.org/packages/OpenCV-Hololens/

Simply add the package via Nuget and you'll have:

• hololens-compatible opencv 3.1 libraries automatically added as references to your c++ project
• additional include directories & additional libraries set up for you

for eg:

#include <opencv2\core\mat.hpp>
...
cv::Mat testMat = cv::Mat();

#include <opencv2\tracking.hpp>
...
cv::Ptr<cv::Tracker> openCvTracker = cv::Tracker::create("KCF");

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Modules built:

core flann imgproc ml photo reg surface_matching video fuzzy imgcodecs shape videoio highgui objdetect plot xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib datasets rgbd stereo tracking videostab xfeatures2d ximgproc aruco optflow phase_unwrapping stitching structured_light

Modules Unavailable:

cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 superres ts viz cnn_3dobj cvv dnn hdf matlab sfm

Following prgs installed:

• cmake => https://cmake.org/ (tested with 3.6.2)
• python2.7 => https://www.python.org/download/releases/2.7/

How to run the build:

1/ download or clone

• opencv-hololens (https://github.com/sylvain-prevost/opencv-hololens)
• opencv-hololens-contrib (https://github.com/sylvain-prevost/opencv_contrib-hololens)

worry-free structure:

• parent_dir\opencv-hololens-contrib
• parent_dir\opencv-hololens

(you neeed to adjust the opencv-hololens\build_hololens_uwp.bat batch file if using a diff structure)

2/ run parent_dir\opencv-hololens\build_hololens_uwp.bat

3/ open parent_dir\opencv-hololens\bin\WS\10.0\x86\OpenCV.sln

4/ Select Platform : Win32

5/ Select Configuration (either Debug or Release)

6/ find all binaries in opencv-hololens\bin\WS\10.0\x86[Configuration]

7/ You can now add references to the generated binaries in your Hololens C++ UWP application(s) either via .dll & .lib, or using the .winmd

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Note1:

If using C#, you've got to create a "Window Runtime Component" wrapping library to access the native UWP OpenCV. This is what OpenCvSharp provides, however to date, it does not support UWP for hololens. To not have to re-create everything, I suggest to simply expose the strict minimum from the WRC library and limit large buffer exchanges between .Net layer and WRC layer to strict minimum.

Note2:

I'm not pushing the changes in the main opencv trunk mainly because I'm not familiar with their commit rules, and because I'm pretty sure that the 'adjustements' I did are not acceptable as is.

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