The MCvSURFParams type exposes the following members.
Fields
| Name | Description | |
|---|---|---|
| extended |
0 means basic descriptors (64 elements each),
1 means extended descriptors (128 elements each)
| |
| hessianThreshold |
Only features with keypoint.hessian larger than that are extracted.
good default value is ~300-500 (can depend on the average local contrast and sharpness of the image).
user can further filter out some features based on their hessian values and other characteristics
| |
| nOctaveLayers |
The number of layers within each octave (4 by default)
| |
| nOctaves |
The number of octaves to be used for extraction.
With each next octave the feature size is doubled (3 by default)
|