Scale distortion factors to a reasonable amount

Based on detections at driver practice, the distortion factor shouldn't
go above 0.0005 (didn't see any above 0.0002).
Scale factors so that 0.0005 (and anything higher) goes to 1,
so we can intuitively interpret these.

A detection heavily affected by distortion should have a factor of
around 0.1 or greater. Ones closer to the center of the image are
usually less than 0.01.

Signed-off-by: milind-u <milind.upadhyay@gmail.com>
Change-Id: Iacb04c7baa76b58b495832277b1e953aaef7cdaf
diff --git a/frc971/vision/target_map.fbs b/frc971/vision/target_map.fbs
index 3ad0bd8..e635760 100644
--- a/frc971/vision/target_map.fbs
+++ b/frc971/vision/target_map.fbs
@@ -44,7 +44,7 @@
   // Only filled out if this pose represents a live detection.
   // This is computed as the average distance between the distorted
   // corners and undistorted corners, normalized by the image size
-  // to be between 0-1.
+  // and the maximum expected distortion to be between 0-1.
   // NOTE: not filtered by aprilrobotics.cc so that we can log
   // more detections.
   distortion_factor:double (id: 5);