ofxOpenSurf

extend
#1

I kind of remember somebody already posted about SURF + OF, but I did not manage to find the code, so I decided to wrap my own addon.

I started from OpenSurf, which is well documented and friendly licensed (GPL3), then I simply extended ofxCvImage and made a few handy functions to extract SURF points; it’s still betaish, but seems to work well: I could track an image in my webcam feed @30-40fps.

Here’s a few pics.

As soon as I have some time to clean it up I will upload the addon.

#2

Can you upload it plz? (even if not clean enough :P)

#3

here it is: http://code.google.com/p/ofxopensurf/

it’s betaish, but it should give you all you need to Surf inside OF :slight_smile:

#4

hi Enrico,
re: ur ofxOpenSurf addon,
did you ever work out how to get corners working?
im just starting to look into myself…

L.

#5

figured it out.
thinking of putting this onto github if you don’t mind?

  
  
int ofxSurfObjCorners(IpPairVec & matches,const ofPoint src_crn[4],ofPoint dst_crn[4])  
{  
    CvPoint src_corners[ 4 ];  
    CvPoint dst_corners[ 4 ];  
      
    src_corners[ 0 ].x = src_crn[ 0 ].x;  
    src_corners[ 0 ].y = src_crn[ 0 ].y;  
    src_corners[ 1 ].x = src_crn[ 1 ].x;  
    src_corners[ 1 ].y = src_crn[ 1 ].y;  
    src_corners[ 2 ].x = src_crn[ 2 ].x;  
    src_corners[ 2 ].y = src_crn[ 2 ].y;  
    src_corners[ 3 ].x = src_crn[ 3 ].x;  
    src_corners[ 3 ].y = src_crn[ 3 ].y;  
      
    int success = translateCorners( matches, src_corners, dst_corners );  
      
    if( success )  
    {  
        dst_crn[ 0 ].x = dst_corners[ 0 ].x;  
        dst_crn[ 0 ].y = dst_corners[ 0 ].y;  
        dst_crn[ 1 ].x = dst_corners[ 1 ].x;  
        dst_crn[ 1 ].y = dst_corners[ 1 ].y;  
        dst_crn[ 2 ].x = dst_corners[ 2 ].x;  
        dst_crn[ 2 ].y = dst_corners[ 2 ].y;  
        dst_crn[ 3 ].x = dst_corners[ 3 ].x;  
        dst_crn[ 3 ].y = dst_corners[ 3 ].y;  
    }  
      
    return success;  
}
#6

hi.

does anyone have an example file for how to use opensurf?

thx.

#7

this year I used the addon in a open source edutainment project: you can dowload the source code here:

http://naufolio.augmentedrealityag.com/installations/democratizing-technology/