This kernel is for CV_8UC1 format and 3x3 kernel size,
It is about 33% ~ 55% faster than current ocl kernel with below perf test

python ./modules/ts/misc/run.py -t imgproc --gtest_filter=OCL_ErodeFixture*
python ./modules/ts/misc/run.py -t imgproc --gtest_filter=OCL_DilateFixture*

Also add accuracy test cases for this kernel, the test command is

./bin/opencv_test_imgproc --gtest_filter=OCL_Filter/MorphFilter3x3*
Signed-off-by: Li Peng <peng.li@intel.com>

Aravis SDK: Basic software based autoexposure control

* Basic software based autoexposure control

* Aravis autoexposure: skip frame taken while changing exposure setup

we are drawing on a BGR image declared as RGB, so we should not swap
components here either.

also correctly forward spacing parameter in fontQt

To resolve undefined "Mat_to_vector_KeyPoint" error

Fix findContours crash for very large images (#7451)

* Cast step to size_t in order to avoid integer overflow when processing very large images

* Change assert to CV_Assert

  * add performance test for 32F and 64F threshold
  * requires update of opencv_extra

improved fix for java wrapper generator (gen_java.py) to avoid generation of java methods with duplicate signatures(v3)