ImageEn for Delphi and C++ Builder ImageEn for Delphi and C++ Builder
ImageEn Forum
Profile    Join    Active Topics    Forum FAQ    Search this forumSearch
Forum membership is Free!  Click Join to sign-up
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 ImageEn Library for Delphi, C++ and .Net
 ImageEn and IEvolution Support Forum
 IEVision, BlobDetector and keypoints
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

gege52

France
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)
  end;


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????

xequte

4888 Posts

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

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

https://docs.opencv.org/3.4/d0/d7a/classcv_1_1SimpleBlobDetector.html
https://docs.opencv.org/3.4/d2/d29/classcv_1_1KeyPoint.html



Nigel
Xequte Software
www.imageen.com
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To: