added header from subscribed image to detection image (#3)

Author: GeorgUr

detection_visualizer/__init__.py

@@ -79,8 +79,11 @@ def on_detections(self, image_msg, detections_msg):
             pos = (min_pt[0], max_pt[1])
             font = cv2.FONT_HERSHEY_SIMPLEX
             cv2.putText(cv_image, label, pos, font, 0.75, color, 1, cv2.LINE_AA)
+            
+        detection_image_msg = self._bridge.cv2_to_imgmsg(cv_image, encoding="bgr8")
+        detection_image_msg.header = image_msg.header
 
-        self._image_pub.publish(self._bridge.cv2_to_imgmsg(cv_image, encoding="bgr8"))
+        self._image_pub.publish(detection_image_msg)
 
 
 def main():