SIFTRun Method (InputArray, InputArray, KeyPoint, Single, Boolean) OpenCvSharp Class Library
detects keypoints and computes the SIFT descriptors for them.

Namespace:  OpenCvSharp.CPlusPlus
Assembly:  OpenCvSharp.CPlusPlus (in OpenCvSharp.CPlusPlus.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax

public void Run(
	InputArray img,
	InputArray mask,
	out KeyPoint[] keypoints,
	out float[] descriptors,
	bool useProvidedKeypoints = false
)

Parameters

img
Type: OpenCvSharp.CPlusPlusInputArray
Input 8-bit grayscale image
mask
Type: OpenCvSharp.CPlusPlusInputArray
Optional input mask that marks the regions where we should detect features.
keypoints
Type: OpenCvSharp.CPlusPlusKeyPoint
The input/output vector of keypoints
descriptors
Type: SystemSingle
The output matrix of descriptors.
useProvidedKeypoints (Optional)
Type: SystemBoolean
Boolean flag. If it is true, the keypoint detector is not run. Instead, the provided vector of keypoints is used and the algorithm just computes their descriptors.
See Also

Reference