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1 | initial version |
import rospy from sensor_msgs.msg import Image from cv_bridge import CvBridge import cv2 import numpy as np
def callback(data):
br = CvBridge()
rospy.loginfo("receiving video frame")
current_frame = br.imgmsg_to_cv2(data)
cv_image_array = np.array(current_frame, dtype = np.dtype('f8'))
cv_image_norm = cv2.normalize(cv_image_norm, cv_image_array, 0, 1, cv2.NORM_MINMAX)
cv2.imshow("camera", cv2.cvtColor(current_frame,cv2.COLOR_BGR2RGB))
print(cv_image_norm.shape)
cv2.waitKey(1)
def receive_message():
rospy.init_node('video_sub_py', anonymous=True)
rospy.Subscriber('__YOUR_TOPIC_NAME', Image, callback) # check name by rostopic list
rospy.spin()
cv2.destroyAllWindows()
if __name__ == '__main__':
receive_message()
2 | No.2 Revision |
Code:
import rospy
from sensor_msgs.msg import Image
from cv_bridge import CvBridge
import cv2
import numpy as npnp
def callback(data):
br = CvBridge()
rospy.loginfo("receiving video frame")
current_frame = br.imgmsg_to_cv2(data)
cv_image_array = np.array(current_frame, dtype = np.dtype('f8'))
cv_image_norm = cv2.normalize(cv_image_norm, cv_image_array, 0, 1, cv2.NORM_MINMAX)
cv2.imshow("camera", cv2.cvtColor(current_frame,cv2.COLOR_BGR2RGB))
print(cv_image_norm.shape)
cv2.waitKey(1)
def receive_message():
rospy.init_node('video_sub_py', anonymous=True)
rospy.Subscriber('__YOUR_TOPIC_NAME', Image, callback) # check name by rostopic list
rospy.spin()
cv2.destroyAllWindows()
if __name__ == '__main__':
receive_message()
3 | No.3 Revision |
This thing works for me. For getting an Image stream.
Code:
import rospy
from sensor_msgs.msg import Image
from cv_bridge import CvBridge
import cv2
import numpy as np
def callback(data):
br = CvBridge()
rospy.loginfo("receiving video frame")
current_frame = br.imgmsg_to_cv2(data)
cv_image_array = np.array(current_frame, dtype = np.dtype('f8'))
cv_image_norm = cv2.normalize(cv_image_norm, cv_image_array, 0, 1, cv2.NORM_MINMAX)
cv2.imshow("camera", cv2.cvtColor(current_frame,cv2.COLOR_BGR2RGB))
print(cv_image_norm.shape)
cv2.waitKey(1)
def receive_message():
rospy.init_node('video_sub_py', anonymous=True)
rospy.Subscriber('__YOUR_TOPIC_NAME', Image, callback) # check name by rostopic list
rospy.spin()
cv2.destroyAllWindows()
if __name__ == '__main__':
receive_message()