Rework RLOF by using HAL universal instructions

* * distinguish between SSE2 and SSE 4.1 support
* SSE2 now implements no paralellized _blendv functiona and allows to compile with SSE2 instructions

* * add interface function do enable disable M-estimator framework
* bugfix blendv functions

* * make use of _mm_store and _mm_load functions in blendv_ps and blendv_epi function to fix compiler error

* * implement substitute of _mm_cvtepi8_epi16 and _mm_cvtepi16_epi32 when compiling with less than SSE 4.1 support

* * implement substitute of _mm_abs_epi16 when compiling with less than SSE 3 support

* * move _mm_abs_epi16 to SSE4 req.

* * add HAL intrinsic functions for RLOF ICA
* first tests are OK

* * HAL intrinsic functions -> RLOF ICA is ready now

* * add HAL functions for RLOF illumination model

* * add HAL for PLK ILL

* * add HAL functions for plk ica

* * commit HAL functions for beplk ica

* * add HAL functions for berlof ica

* * add HAL functions for BEPLK ILL

* *remove unused #ifdef

* * remove white spaces and unused variables

* * remove not used variables

* + remove get4BitMask function which contained pure SEE instructions

* * remove buffIdx which has not been used but initialized

* * fix replacement of #ifdef CV_SIMD128 with #if CV_SIMD128
* rename useMEstimator to setUseMEstimator

* *remove whitespace

* * remove unused variable abss

* * remove unused value

* * rename W_BITS1 to W_BITS since they contain same value

* Add a python wrap to the dnn_superres module

Adds a python wrap with approriate python bindings and tutorial

Also fixes some minor errors in the tutorials

* Remove trailing whitespaces

* Remove erring python binding

try to fix a windows build error

* Add python tests

Tests model that upscales an image x2

Test getter functions

* Add one more subdirectory

add 'test' subdir

Use checkVector over "2-point trick"

Fix warnings on MSVC compiler

- reduce unused dependencies

* Computer Vision based Alpha Matting Code

alpha matting code

This is a combination of 3 commits.

removed whitespaces

addressed issues raised in the PR

removed whitespaces

* removed global variable

* incorporated changes suggested by second round of review

* updated build instructions

* changed to OutputArray

* removed whitespaces

* alphamat: fix bugs triggered by assertions of Debug builds

* alphamat: fix documentation

* alphamat: coding style fixes

- get rid of std::cout
- remove clock_t
- drop unnecessary cast: float pix = tmap.at<uchar>(i, j);
- global 'dim' => 'ALPHAMAT_DIM'
- fix sample command line handling

* alphamat: apply clang-format

* clang-format fixups

* Fix for Depth Registration. Issue #2234

* Fix style

* Incorporating suggestions. 1. Trailing whitespace 2. Matx33f 3. EXPECT_EQ

* test: use Matx33f ctor

* Adding constructor for kinfu_Params(). Allows users to configure parameters for KinFu Algorithm

* Trailing whitespace correct

* Add constructor for TSDF Initial Pose. Allowed parameters are Matx33f,Vec3f and Matx44f. Also added function setInitialVolumePose to handle Matx44f param data type.

SinusoidalPattern::unwrapPhaseMap now takes an InputArray instead of InputArrayOfArrays to correct a Python binding problem
present a scriptable HistogramPhaseUnwrapping::create

replicate C++ structured_light test in Python

PhaseUnwrapping now init unwrappedPhase so pixel outside the mask area are set to 0

python binding for HistogramPhaseUnwrapping::Params to use HistogramPhaseUnwrapping::create

reformatted the documentation

* issue-16736: quick step towards moving SIFT from non-free to free. Moves
include, tests, and implementation to free area.

* FREAK : better rounding off for weighted dx and dy of orientation pairs

* updated using cvRound

* cvRound modified

* Add overload method and fix typos in omnidir (1/2)

Addresses part of https://github.com/opencv/opencv/issues/16601

* Add overload method in omnidir (2/2)

Addresses part of https://github.com/opencv/opencv/issues/16601