Small tweaks to improve visualization and clarity

Add "-est" to the estimated pose of targets, since they were sometimes
drawn over by the ideal values

Change-Id: I2c19fcb7b07bbb79b51b6faf5efa753f07026a48
Signed-off-by: Jim Ostrowski <yimmy13@gmail.com>
diff --git a/frc971/vision/target_mapper.h b/frc971/vision/target_mapper.h
index cfefcc7..dc4a85a 100644
--- a/frc971/vision/target_mapper.h
+++ b/frc971/vision/target_mapper.h
@@ -116,6 +116,10 @@
   Eigen::Translation3d T_frozen_actual_;
   Eigen::Quaterniond R_frozen_actual_;
 
+  const double kFieldWidth_ = 20.0;  // 20 meters across
+  const int kImageWidth_ = 1000;
+  const int kImageHeight_ =
+      kImageWidth_ * 3.0 / 4.0;  // Roughly matches field aspect ratio
   mutable VisualizeRobot vis_robot_;
 
   Stats stats_with_outliers_;