[Feature] opencv-contrib modules

[cocoa-xu]

I plan to add support for modules in opencv_contrib gradually. Of course, this would bring an inevitable question: not everyone will use modules in opencv_contrib, so including them in the precompiled binaries will increase the footprint.

Will it be feasible to have an :evision_contrib library in Elixir (like its python counterpart, where we have opencv-python and opencv-python-contrib)?

Modules (part 1)

• barcode
• dnn_superres
• face
• img_hash
• plot
• quality
• rapid
• sfm
• shape
• structured_light
• text
• tracking
• xfeatures2d
• ximgproc
• xphoto

Modules (part 2)

• aruco
• bgsegm
• bioinspired
• hfs
• line_descriptor
• mcc
• reg
• rgbd
• saliency
• stereo
• surface_matching
• wechat_qrcode

Modules (part 3)

• cudaarithm
• cudabgsegm
• cudacodec
• cudafeatures2d
• cudafilters
• cudaimgproc
• cudalegacy
• cudaobjdetect
• cudaoptflow
• cudastereo
• cudawarping
• cudev

todo

• Check module name and struct name
• Check _Params classes
• Examples/Tests for modules in opencv_contrib #172

[cocoa-xu]

module hdf and freetype in the opencv_contrib will not include in the precompiled binaries because they depend on external libraries.

Nevertheless, it's possible to compile libhdf5 and ship it together.

[cocoa-xu]

There are several ways we can take:

• Including both opencv and opencv_contrib in the precompiled binaries.
• Using an environment variable (or something in config.exs) as an indicator for whether to include opencv_contrib (both for precompilation and compiling from source).

[cocoa-xu]

Some issues in v0.1.26-rc2. The name of these modules needs to be corrected.

• https://hexdocs.pm/evision/0.1.26-rc2/Evision.Ximgprocsegmentation.html
• https://hexdocs.pm/evision/0.1.26-rc2/Evision.Utilsnested.html

[cocoa-xu]

v0.1.26 is shipped. I'll add examples and tests later!