- fix https://github.com/opencv/opencv/issues/18906
- unable to add related test cases as there is
  no public access to Context:Impl refcounts

Support XCFramework builds, Catalyst

* Early work on xcframework support

* Improve legibility

* Somehow this works

* Specify ABIs in a place where they won't get erased

If you pass in the C/CXX flags from the Python script, they won't be respected. By doing it in the actual toolchain, the options are respected and Catalyst successfully links.

* Clean up and push updates

* Actually use Catalyst ABI

Needed to specify EXE linker flags to get compiler tests to link to the Catalyst ABIs.

* Clean up

* Revert changes to common toolchain that don't matter

* Try some things

* Support Catalyst build in OSX scripts

* Remove unnecessary iOS reference to AssetsLibrary framework

* Getting closer

* Try some things, port to Python 3

* Some additional fixes

* Point Cmake Plist gen to osx directory for Catalyst targets

* Remove dynamic lib references for Catalyst, copy iOS instead of macos

* Add flag for building only specified archs, remove iOS catalyst refs

* Add build-xcframework.sh

* Update build-xcframework.sh

* Add presumptive Apple Silicon support

* Add arm64 iphonesimulator target

* Fix xcframework build

* Working on arm64 iOS simulator

* Support 2.7 (replace run with check_output)

* Correctly check output of uname_m against arch

* Clean up

* Use lipo for intermediate frameworks, add python script

Remove unneeded __init__.py

* Simplify python xcframework build script

* Add --only-64-bit flag

* Add --framework-name flag

* Document

* Commit to f-strings, improve console output

* Add i386 to iphonesimulator platform in xcframework generator

* Enable objc for non-Catalyst frameworks

* Fix xcframework builder for paths with spaces

* Use arch when specifying Catalyst build platform in build command

* Fix incorrect settings for framework_name argparse configuration

* Prefer underscores instead of hyphens in new flags

* Move Catalyst flags to where they'll actually get used

* Use --without=objc on Catalyst target for now

* Remove get_or_create_folder and simplify logic

* Remove unused import

* Tighten up help text

* Document

* Move common functions into cv_build_utils

* Improve documentation

* Remove old build script

* Add readme

* Check for required CMake and Xcode versions

* Clean up TODOs and re-enable `copy_samples()`

Remove TODO

Fixup

* Add missing print_function import

* Clarify CMake dependency documentation

* Revert python2 change in gen_objc

* Remove unnecessary builtins imports

* Remove trailing whitespace

* Avoid building Catalyst unless specified

This makes Catalyst support a non-breaking change, though defaults should be specified when a breaking change is possible.

* Prevent lipoing for the same archs on different platforms before build

* Rename build-xcframework.py to build_xcframework.py

* Check for duplicate archs more carefully

* Prevent sample copying error when directory already exists

This can happen when building multiple architectures for the same platform.

* Simplify code for checking for default archs

* Improve build_xcframework.py header text

* Correctly resolve Python script paths

* Parse only known args in ios/osx build_framework.py

* Pass through uncaptured args in build_xcframework to osx/ios build

* Fix typo

* Fix typo

* Fix unparameterized build path for intermediate frameworks

* Fix dyanmic info.plist path for catalyst

* Fix utf-8 Python 3 issue

* Add dynamic flag to osx script

* Rename platform to platforms, remove armv7s and i386

* Fix creation of dynamic framework on maccatalyst and macos

* Update platforms/apple/readme.md

* Add `macos_archs` flag and deprecate `archs` flag

* Allow specification of archs when generating xcframework from terminal

* Change xcframework platform argument names to match archs flag names

* Remove platforms as a concept and shadow archs flags from ios/osx .py

* Improve documentation

* Fix building of objc module on Catalyst, excluding Swift

* Clean up build folder logic a bit

* Fix framework_name flag

* Drop passthrough_args, use unknown_args instead

* minor: coding style changes
Co-authored-by: NChris Ballinger <cballinger@rightpoint.com>

G-API: Adding skip for GraphMeta tests

* Added skip for GraphMeta tests

* Removed false

Added SQPnP algorithm to SolvePnP

* Added sqpnp

* Fixed test case

* Added fix for duplicate point checking and inverse func reuse

* Changes for 3x speedup

Changed norm method (significant speed increase), changed nearest rotation computation to FOAM

* Added symmetric 3x3 inverse and unrolled loops

* Fixed error with SVD

* Fixed error from with indices

Indices were initialized negative. When nullspace is large, points coplanar, and rotation near 0, indices not changed.

Fixing dnn Resize layer for variable input size

* Fix onnx loading of resize/upsample layers for different opset

* group all DynamicResize tests

* cleaned up scales checks

* Simplify branching

Expose CGImage <-> Mat conversion for iOS platforms

* Add apple_conversions to framework builds

This exposes CGImage <-> Mat conversion.

* Export Mat <-> CGImage methods on iOS targets

* Add CGImage converters to iOS objc helper class

* Add CF_RETURNS_RETAINED annotations to methods returning CGImageRef

Ordinary quaternion

* version 1.0

* add assumeUnit;
add UnitTest;
check boundary value;
fix the func using method: func(obj);
fix 4x4;
add rodrigues vector transformation;
fix mat to quat;

* fix blank and tab

* fix blank and tab
modify test;cpp to hpp

* mainly improve comment;
add rvec2Quat;fix toRodrigues;
fix throw to CV_Error

* fix bug of quatd * int;
combine hpp and cpp;
fix << overload error in win system;
modify include in test file;

* move implementation to quaternion.ini.hpp;
change some constructor to createFrom* function;
change Rodrigues vector to rotation vector;
change the matexpr to mat of 3x3 return type;
improve comments;

* try fix log function error in win

* add enums for assumeUnit;
improve docs;
add using std::cos funcs

* remove using std::* from header;
add std::* in affine.hpp,warpers_inl.hpp;

* quat: coding style

* quat: AssumeType => QuatAssumeType

Minimum change to address issue #18837

- Add python explanation for erosion and dilation
- Add java explanation for erosion and dilation
- Restructure and reword specific sections

Tracking API: move to video/tracking.hpp

* video(tracking): moved code from opencv_contrib/tracking module

- Tracker API
- MIL, GOTURN trackers
- applied clang-format

* video(tracking): cleanup unused code

* samples: add tracker.py sample

* video(tracking): avoid div by zero

* static analyzer

G-API: Adding a skip for failed streaming tests

* Skip tests

* Pathfinding

* Pathfinding part 2

* Pathfinding part 3

* Fix review comments

3rdparty: libjpeg-turbo 2.0.5 => 2.0.6