Substitute for image_view for command line

edit

Hello @shankk,

Terminal Check:

$ rostopic list

It will give you the list of topics been published.

$ rostopic echo /image_publish_topic_name

You can get an array of integers with random numbers that means your image is published and it is perfect.

Your output can be in this form described in the above image.

Browser Check:

You can view this stream in your browser.

I think a browser will be a good Substitute.

import rclpy
from rclpy.node import Node
from cv_bridge import CvBridge
from sensor_msgs.msg import Image


class ImageNode(Node):
    def __init__(self):
        super().__init__("image_save_jpg")
        self.subscriber_ = self.create_subscription(
            Image, "Your_image_channel_name", self.callback, 10)
        self.get_logger().info("Images saved has been started.")
        self.counter = 0

    def callback(data):
        br = CvBridge()
        rospy.loginfo("receiving video frame")
        # Convert ROS Image message to OpenCV image
        current_frame = br.imgmsg_to_cv2(data)
        # saved image to jpg , counter for unique name
        cv2.imwrite("path"+self.counter+".jpeg", img)
        self.counter += 1



def main(args=None):
    rclpy.init(args=args)
    node = SmartphoneNode()
    rclpy.spin(node)
    rclpy.shutdown()


if __name__ == "__main__":
    main()

I hope this helps you,

You could take a look at dheera/rosshow.

Alternatively: run image_view on a remote system which does have the capability to run GUI programs. ROS is distributed by nature, so that should work.

I would like the file to be intact. I just want to know if the files are being published correctly or not

if you can't use a remote system, you could use the image_saver node from the image_viewer package (ROS Index link). It should work in the same way as it did in ROS 1.

No need to write anything custom yourself.