How to determine the line width in OpenCV's drawMatches

I'm using OpenCV's drawMatches() to draw the matches between keypoints. Is there a way we can specify the width of the lines drawn, as in my case they appear very thin.

Thanks.

It should not be possible unless you are willing to edit and recompile openCV.

From modules/features2d/src/draw.cpp

line( outImg,
  Point(cvRound(pt1.x*draw_multiplier), cvRound(pt1.y*draw_multiplier)),
  Point(cvRound(dpt2.x*draw_multiplier), cvRound(dpt2.y*draw_multiplier)),
  color, 1, LINE_AA, draw_shift_bits );

This call draws the line between the two keypoints and the 1 in the function call specifies the thickness of the line (see openCV doc). Unfortunately it has been hard-coded inside the draw function.

However it looks quite strange that you are not able to correctly visualize the matches. They are quite fine to me.