|  | OpenCV
    4.1.0
    Open Source Computer Vision | 
| Classes | |
| class | cv::BOWImgDescriptorExtractor | 
| Class to compute an image descriptor using the bag of visual words.  More... | |
| class | cv::BOWKMeansTrainer | 
| kmeans -based class to train visual vocabulary using the bag of visual words approach. :  More... | |
| class | cv::BOWTrainer | 
| Abstract base class for training the bag of visual words vocabulary from a set of descriptors.  More... | |
This section describes approaches based on local 2D features and used to categorize objects.
 1.8.3
 1.8.3