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 IEVision, BlobDetector and keypoints
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7 Posts

Posted - Apr 13 2019 :  19:07:18  Show Profile  Reply
The BlobDetector return a list of TIEVisionKeyPoint

The IEVision documentation says:

TIEVisionKeyPoint = packed record
    pt: TIEVisionPoint2f; // coordinates of the keypoints
    size: single;         // diameter of the meaningful keypoint neighborhood
    angle: single;        // computed orientation of the keypoint (-1 if not applicable); it's in [0,360) degrees and measured relative to image coordinate system, ie in clockwise.
    response: single;     // the response by which the most strong keypoints have been selected. Can be used for the further sorting or subsampling
    octave: int32_t;      // octave (pyramid layer) from which the keypoint has been extracted
    class_id: int32_t;    // object class (if the keypoints need to be clustered by an object they belong to)

These parameters are abstruses, for example what is "diameter of the meaningful keypoint neighborhood"?

Is it possible to acquire the contour of the Blob, or the true area of the Blob?

Are the coordinates
pt: TIEVisionPoint2f
the coordonates of the gravity Center????


4888 Posts

Posted - Apr 14 2019 :  18:21:23  Show Profile  Reply

Blob detection in IEVision is based on OpenCV. You might find their documentation more illuminating:

Xequte Software
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