Update test_hdr.cpp

Update test_hdr.cpp

Harmonise bibtex formatting. Sort entries alphabetically by the last name of the first paper author.

* ximgproc(test): createSuperpixelSLIC smoke test

* ximgproc: don't use 'operator+()' with empty cv::Mat

backport commit 13f76375

backport commit 8c092493

Added constructors and destructors for RgbdPlane

* declared constructors and destructors of RgbdPlane

* definitions written

* tests for python bindings added

Add test for ximgproc/edgeboxes and fix up Python sample to work with returning scores

* Test for Edgeboxes implementation

* Fix and enhance edgeboxes_demo.py

* Make double literal a float literal

* Address review feedback

Build DoG Pyramid if useProvideKeypoints is false

The buildDoGPyramid operation need not be performed unconditionally. In cases where it is not needed, both memory and speed performance can be improved

- instead of validation checks

Fix memory corruption in RgbdPlane

* Fix memory corruption

* Use divUp instead of explicit rounding up integer division

* rgbd: add test