update the docs for cvExtractSURF and initModule_nonfree()

13 years ago · c52d620817
parent 86d785622b
commit c52d620817
1 changed files with 2 additions and 0 deletions
--- a/modules/nonfree/doc/feature_detection.rst
+++ b/modules/nonfree/doc/feature_detection.rst
@ -126,3 +126,5 @@ Detects keypoints and computes SURF descriptors for them.
    :param params: SURF algorithm parameters in OpenCV 1.x API.

 The function is parallelized with the TBB library.
+
+If you are using the C version, make sure you call ``cv::initModule_nonfree()`` from ``nonfree/nonfree.hpp``.