recieve params on jevois cameras.

Change-Id: I6075ab70dad44c6e31ec4eeda5e492611bef6a46
diff --git a/y2019/vision/target_finder.h b/y2019/vision/target_finder.h
index 633733a..5957fa6 100644
--- a/y2019/vision/target_finder.h
+++ b/y2019/vision/target_finder.h
@@ -57,6 +57,7 @@
   const Target &GetTemplateTarget() { return target_template_; }
 
   const IntrinsicParams &intrinsics() const { return intrinsics_; }
+  IntrinsicParams *mutable_intrinsics() { return &intrinsics_; }
 
  private:
   // Find a loosly connected target.