This simple detector runs up to two times faster than LSD while achieving
competitive results. Please evaluate the algorithm with samples/fld_lines.cpp

added thinning sample
added thinning tests

* Add bilateral texture filter

* Change tab to space

Paillou Filter

comment : english tab and assert  Mat(instead of new)

InputArray and ptr<Type>()

Outputarrays

OutputArray as argument

Update doc

- read image as 1-channel grayscale
- 3 trackers to control function parameters
- K allowed to go to negative values (usually to detect black text on white bg)

- no for-loops
- support all thresholding types
- support any input image depth
- add Doxygen comments

otherwise we get a failed assertion from OutputArray::create

cvx::checkHardwareSupport uses static field to store flags.
Using a global static to store the result is dangerous, as the underlying field checkHardwareSupport uses might not be initialized at that time.