Fix a litte bug on matrix subtraction

dff9c070 · Stefano Fabri · c21a7836 · dff9c070
Commit dff9c070 authored May 03, 2011 by Stefano Fabri
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brief_match_test.cpp samples/cpp/brief_match_test.cpp +3 -1

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--- a/samples/cpp/brief_match_test.cpp
+++ b/samples/cpp/brief_match_test.cpp
@@ -126,9 +126,11 @@ int main(int ac, char ** av)
  imshow("matches - popcount - outliers removed", outimg);

  Mat warped;
+  Mat diff;
  warpPerspective(im2, warped, H, im1.size());
  imshow("warped", warped);
-  imshow("diff", im1 - warped);
+  absdiff(im1,warped,diff);
+  imshow("diff", diff);
  waitKey();
  return 0;
 }