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Selection of DescriptorExtractor depends of detection algorithms and you need to select it by your self.
OpenCV GoodFeaturesToTrackDetector already supports Harris algorithm as option. See docs for details.
Trajkovic corner detector is not implemented in OpenCV. You can create your detector class inherited from common FeatureDetector class. Also you can contribute your code to OpenCV via Github.
The feature is a common point on the image.
