error roslaunch turtlebot3_autorace_detect turtlebot3_autorace_detect_sign.launch

[touchtsu]

I learn turtlebot3 with ROS And have problem about this. http://emanual.robotis.com/docs/en/platform/turtlebot3/autonomous_driving/#tutorials-52-traffic-sign When I'm run nod with ("

roslaunch turtlebot3_autorace_detect turtlebot3_autorace_detect_sign.launch

") it's show error like this... "OpenCV Error: Bad argument (image is empty or has incorrect depth (!=CV_8U)) in detectAndCompute, file /tmp/binarydeb/ros-kinetic-opencv3-3.3.1/opencv_contrib/xfeatures2d/src/sift.cpp, line 1121 Traceback (most recent call last): File "/home/touchtsu/catkin_ws/src/turtlebot3_autorace/turtlebot3_autorace_detect/nodes/detect_sign", line 257, in node = DetectSign() File "/home/touchtsu/catkin_ws/src/turtlebot3_autorace/turtlebot3_autorace_detect/nodes/detect_sign", line 34, in init self.fnPreproc() File "/home/touchtsu/catkin_ws/src/turtlebot3_autorace/turtlebot3_autorace_detect/nodes/detect_sign", line 73, in fnPreproc self.kp2, self.des2 = self.sift.detectAndCompute(self.img2,None) cv2.error: /tmp/binarydeb/ros-kinetic-opencv3-3.3.1/opencv_contrib/xfeatures2d/src/sift.cpp:1121: error: (-5) image is empty or has incorrect depth (!=CV_8U) in function detectAndCompute

[detect_sign-1] process has died [pid 24061, exit code 1, cmd /home/touchtsu/catkin_ws/src/turtlebot3_autorace/turtlebot3_autorace_detect/nodes/detect_sign /detect/image_input:=/camera/image_compensated /detect/image_input/compressed:=/camera/image_compensated/compressed /detect/image_output:=/detect/image_traffic_sign /detect/image_output/compressed:=/detect/image_traffic_sign/compressed __name:=detect_sign __log:=/home/touchtsu/.ros/log/6370a9da-7e85-11e8-90ab-40490f7faef9/detect_sign-1.log]. log file: /home/touchtsu/.ros/log/6370a9da-7e85-11e8-90ab-40490f7faef9/detect_sign-1*.log all processes on machine have died, roslaunch will exit shutting down processing monitor... ... shutting down processing monitor complete done"

​it's not show "/detect/image_traffic_sign/compressed" on topic of rqt If you know about this issue please give me answer. Thank you

[kijongGil]

Hi @touchtsu :) Could you give me more information? What are all the commands you typed before the error occurred? and what did you use turtlebot3 model? real or gazebo?

[robotpilot]

This issue will be closed since there were no actions for a while. You can reopen this issue to show this issue to the users whenever. Thanks.