[G-API] Introduce cv.gin/cv.descr_of for python

* Implement cv.gin/cv.descr_of

* Fix macos build

* Fix gcomputation tests

* Add test

* Add using to a void exceeded length for windows build

* Add using to a void exceeded length for windows build

* Fix comments to review

* Fix comments to review

* Update from latest master

* Avoid graph compilation to obtain in/out info

* Fix indentation

* Fix comments to review

* Avoid using default in switches

* Post output meta for giebackend

videoio: HW decode/encode in FFMPEG backend; new properties with support in FFMPEG/GST/MSMF

* HW acceleration in FFMPEG backend

* fixes on Windows, remove D3D9

* HW acceleration in FFMPEG backend

* fixes on Windows, remove D3D9

* improve va test

* Copyright

* check LIBAVUTIL_BUILD >= AV_VERSION_INT(55, 78, 100) // FFMPEG 3.4+

* CAP_MSMF test on .mp4

* .mp4 in test

* improve va test

* Copyright

* check LIBAVUTIL_BUILD >= AV_VERSION_INT(55, 78, 100) // FFMPEG 3.4+

* CAP_MSMF test on .mp4

* .mp4 in test

* .avi for GStreamer test

* revert changes around seek()

* cv_writer_open_with_params

* params.warnUnusedParameters

* VideoCaptureParameters in GStreamer

* open_with_params

* params->getUnused

* Reduce PSNR threshold 33->32 (other tests use 30)

* require FFMPEG 4.0+; PSNR 30 as in other tests

* GStreamer AVI-demux plugin not installed in Ubuntu test environment?

* fix build on very old ffmpeg

* fix build on very old ffmpeg

* fix build issues

* fix build issues (static_cast)

* FFMPEG built on Windows without H264 encoder?

* fix for write_nothing test on VAAPI

* fix warnings

* fix cv_writer_get_prop in plugins

* use avcodec_get_hw_frames_parameters; more robust fallback to SW codecs

* internal function hw_check_device() for device check/logging

* two separate tests for HW read and write

* image size 640x480 in encode test

* WITH_VA=ON (only .h headers used in OpenCV, no linkage dependency)

* exception on VP9 SW encoder?

* rebase master; refine info message

* videoio: fix FFmpeg standalone plugin build

* videoio(ffmpeg): eliminate MSVC build warnings

* address review comments

* videoio(hw): update videocapture_acceleration.read test

- remove parallel decoding by SW code path
- check PSNR against the original generated image

* videoio: minor fixes

* videoio(test): disable unsupported MSMF cases (SW and HW)

* videoio(test): update PSNR thresholds for HW acceleration read

* videoio(test): update debug messages

* "hw_acceleration" whitelisting parameter

* little optimization in test

* D3D11VA supports decoders, doesn't support encoders

* videoio(test): adjust PSNR threshold in write_read_position tests

* videoio(ffmpeg): fix rejecting on acceleration device name mismatch

* videoio(ffmpeg): fix compilation USE_AV_HW_CODECS=0, add more debug logging

* videoio: rework VideoAccelerationType behavior

- enum is not a bitset
- default value is backend specific
- only '_NONE' and '_ANY' may fallback on software processing
- specific H/W acceleration doesn't fallback on software processing. It fails if there is no support for specified H/W acceleration.

* videoio(test): fix for current FFmpeg wrapper
Co-authored-by: NAlexander Alekhin <alexander.a.alekhin@gmail.com>

calib3d(usac): do not crash on empty models

* calib3d(test): regression test for issue 19639

* calib3d(usac): do not crash in setModelParameters()

* calib3d(usac): handle empty models in isModelGood()

* Add Spaghetti algorithm for CCL

* Add stat tests for new and old algorithms

* Switch license header to short version

Caused by overflow of arithmetic operators conversion rank

[G-API] Support multiple asynchronous requests

* Support nireq option

* Disable tests to check CI

* Fix bug with hanging

* WA to green CI

* Snapshot

* Simplify RequestPool

* Add default values to id

* Fix win warning

[G-API]: Performance tests for kmeans

* - Perf.Tests for kmeans(2D, 3D (Point2f/3f), ND (Mat))
 - New file for common parts of acc. and perf. tests for core kernels added
 - Some typos corrections

* Applying comments

Android NDK camera support

* Add native camera video backend for Android

* In the event of a "No buffer available error" wait for the appropriate callback and retry

* Fix stale context when creating a new AndroidCameraCapture

* Add property handling

* improve map allocation check

* fix accoring to CR

apply partial sort to save computations

* apply partial sort

* fix typo

* fix accroding to CR

- remove duplication kind

* Fixed OCL implementation of pyrlk

If prevPts size is (N, 1) (which is a default layout for converting `vector<Point2f>` to `UMat`) the `prevPts.cols == 1` and optical flow will be calculated for the first point only.
Getting `prevPts.total()` as in line 1048 is the correct way to get points count.

* fixed compilation warning (size_t to int)
Signed-off-by: NSergey Krivohatskiy <s.krivohatskiy@gmail.com>

- enables inline construct and assigns with r-values
- enables compiler-created default move
  construct/assigns
- includes test cases

OpenEXR compression options

* Adding possibility to select the compression type for the OpenEXR format.

There are compression modes other than the default that are more suited for certain data. Mainly grainy/noisy data.

* Code review fixes.
Co-authored-by: NDaniel Rydstrom <daniel.rydstrom@sick.se>

- follows iso c++ guideline C.44
- enables default compiler-created constructors to
  also be noexcept

original commit: 77e26a7d

- handled KernelArg, Image2D

- follows iso c++ guideline C.44
- enables default compiler-created constructors to
  also be noexcept

Dual quaternion

* create dual quaternion;
basic operations, functions(exp,log,norm,inv), to/from mat, sclerp.

* add dqb, dqs, gdqb, to/from affine3;
change algorithm of norm, inv, getTranslation, createFromPitch, normalize；
change type translation to Vec3;
comment improve;

* try fix warning: unreferenced local function

* change exp calculation;
add func(obj) operations;

* Change the algorithm of log function;
add assumeUnit in getRotation;
remove dqs;
change std::vector to InputArray

* fix warning: doxygen and Vec<double, 0>

* fix warning: doxygen and Vec<double, 0>

* add inputarray param for gdqb

* change int to size_t

* win cl warning fix

* replace size_t by int at using Mat.at() function

* replace double by float

* interpolation fix

* replace (i, 0) to (i)

* core(quat): exclude ABI, test_dualquaternion=>test_quaternion.cpp
Co-authored-by: Narsaratovtsev <arsaratovtsev@intel.com>
Co-authored-by: NAlexander Alekhin <alexander.a.alekhin@gmail.com>

[G-API] Change memory measurement statistic in Fluid tests

* Change memory measurement statistic in Fluid tests

* Delete irrelevant comment

[G-API] Async infer request hotfix

* Fix hanging on empty roi list

* Prevent possible data race

* Clean up

* Properly handle empty centers in findCirclesGrid

* Address alalek comments. Add unit test to validate bugfix

* fix build warnings, remove unrelated comment