usamamaq's profile - activity

Hello i am new to ros and python. Need little help in how to subscribe to CameraInfo and Image of format sensor_msgs.msg and use its data for further image processing. Here are few lines of code that i am starting with:

from sensor_msgs.msg import CameraInfo, Image
from cv_bridge import CvBridge, CvBridgeError
import cv2

if __name__ == '__main__':
   rospy.init_node('node_name')
   while ~rospy.is_shutdown():
   sub_cam_info = rospy.Subscriber('/camera/rgb/raw_camera_info', CameraInfo)
   sub_rgb = rospy.Subscriber('/camera/rgb/raw_image_color', Image)

From here i want to extract header and data information from 'sub_cam_info' and 'sub_rgb'. Something like this:

camera_info_K = sub_cam_info.K
camera_info_dist_model = sub_cam_info.distortion_model
rgb_image = CvBridge().imgmsg_to_cv2(sub_rgb, encoding="rgb8")

And then use this data for image undistortion:-

rgb_undist = cv2.undistort(rgb_img.data, camera_info_K, camera_info_dist_model)

Mainly i need help in second part i.e. extraction of parameters from CameraInfo and Image msgs. However if someone can help me to sort out body of this whole code! I am already through making up my own CameraInfo and rgb messages, using them for undistortion and publishing on ROS by but now i want to get them from another ROS module and work with them.

Thanks

Yes i am happy with it.

So up till now what i have underatood is that everytime updatenode() is done with occupied or free cells it prune the vo

So up till now what i have underatood is that everytime updatenode() is done with occupied or free cells it prune the vo

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Ok if your velocity and navdata message are being published asynchronously then this can happen or can be many other rea

Ok if your velocity and navdata message are being published asynchronously then this can happen or can be many other rea

Ok if your velocity and navdata message are being published asynchronously then this can happen or can ne many other rea

Thats how i would have done. class main_control_vel(): def __init__(self) self.velocity =Twist()

Ok let me try step by step. Thats how i would have done. class main_control_vel(): def __init__(self) self.veloc

Ok let me try step by step. Thats how i would have done. class def __init__(self) self.velocity =Twist() s

I couldnt verify whole. If it solves your problem do let me know i will add this to answer. P.S. i myself was in your

Ok let me try step by step. Thats how i would have done. main rospy.init_node('go_to', anonymous=True) m_land = main_

Ok let me try step by step. Thats how i would have done. main 1. Init node rospy.init_node('go_to', anonymous=True)

Ok let me try step by step. Thats how i would have done. main 1. Init node rospy.init_node('go_to', anonymous=True)