Optional 3rd parties for vision module

ViSP vision module may use opencv 3rd party library for keypoint extraction and matching, and for the calibration tool.

Recommended optional 3rd parties

The next table gives the recommended libraries that should be installed to enable some ViSP capabilities.

3rd party				Capabilities
OpenCV	++	++	++	Keypoint extraction and matching, camera calibration

Deprecated optional 3rd parties

After releasing ViSP 3.2.0 we introduce pugixml as a built-in 3rd party library. It replaces favorbly libxml2 3rd party library. As a consequence, there is no more need to install any 3rd party to parse xml files.

For those who want to continue to use ViSP releases up to ViSP 3.2.0 included, we give the instructions to install libxml2:

3rd party				Capabilities
libxml2	++	++	++	Keypoint detector and matching parameters setting