tracker/pt: replace original blob center search with meanshift

The functions are almost identical so why not.

I removed several bits:

- weighting by squared pixel value is bad. weight by pixel
  value instead.
- making the ROI twice as big doesn't make sense and makes for
  misdetected blobs. remove it.
- switch radius coefficient to something doing less iterations.
- sprinkle some __restrict pointer qualifier.
- cv::floodfill invocation had some hardcoded flag value.
- point radius circle and the bullseye line length weren't
  adjusted by scaling ratio. while the circle fitted the radius
  tightly, it was now clutter, so I removed it, leaving only the
  properly-scaled bullseye.
- brightness had to go sadly since it's not accumulated anymore.

1 files changed, 2 insertions, 4 deletions

diff --git a/tracker-pt/point_extractor.h b/tracker-pt/point_extractor.h
index f931edd5..3c0b76d8 100644
--- a/tracker-pt/point_extractor.h
+++ b/tracker-pt/point_extractor.h
@@ -38,13 +38,11 @@ private:
     cv::Mat hist;
     cv::Mat frame_blobs;
 
-    struct blob
+    struct blob final
     {
-        double radius, brightness;
+        double radius;
         vec2 pos;
         cv::Rect rect;
-
-        blob(double radius, const cv::Vec2d& pos, double brightness, cv::Rect &rect);
     };
 
     std::vector<blob> blobs;