yolov3_ros input topic channel problem about yolov3

[github-actions]

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[glenn-jocher]

@imdsafi09 hello!

It sounds like you're experiencing an issue with image encoding compatibility when using YOLOv3 with ROS and your Ouster lidar's mono16 images. YOLOv3 typically expects 8-bit images (mono8 or bgr8), so the warning indicates that ROS is trying to convert from mono16 to mono8 to match the expected input format.

To address this, you could manually convert your images to mono8 or bgr8 before passing them to YOLOv3. This conversion can be done within your ROS node that interfaces with the YOLOv3 model. You might need to adjust the image encoding in your subscriber callback function to ensure the images are in the correct format before they are processed by YOLOv3.

For more detailed guidance on working with different image encodings and YOLOv3, please refer to our documentation at https://docs.ultralytics.com.

Keep in mind that handling image data correctly is crucial for the performance of the model. If the issue persists after trying the suggested conversion, please provide more details about the error message following the warning, and we'll do our best to assist you further.

[imdsafi09]

@glenn-jocher Hello!
Thank you for your detailed answer. I tried to write a python script to convert mono-16 to mono-8, and after checking in ROS rqt it seems the coversion is working. However, the error remain persist. Below I attached the code please let me if there is any issue in that.

`#!/usr/bin/env python3

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

class ImageConverter:
def init(self):
self.bridge = CvBridge()
self.image_sub = rospy.Subscriber("/ouster/signal_image", Image, self.callback)
self.image_pub = rospy.Publisher("ouster/rgb/image_raw", Image, queue_size=10)

def callback(self, data):
    try:
        # Convert the ROS image to a CV2 image
        cv_image = self.bridge.imgmsg_to_cv2(data, "mono16")
    except CvBridgeError as e:
        rospy.logerr(e)

    # Perform the conversion from Mono16 to Mono8
    # OpenCV automatically scales the pixel values to the 0-255 range
    cv_image_mono8 = cv2.convertScaleAbs(cv_image, alpha=(255.0/65535.0))

    try:
        # Convert the CV2 image back to a ROS image and publish
        self.image_pub.publish(self.bridge.cv2_to_imgmsg(cv_image_mono8, "mono8"))
    except CvBridgeError as e:
        rospy.logerr(e)

if name == 'main':
rospy.init_node('mono16_to_mono8_converter', anonymous=True)
ic = ImageConverter()
try:
rospy.spin()
except KeyboardInterrupt:
print("Shutting down")
`

[glenn-jocher]

@imdsafi09, your script for converting mono16 to mono8 images looks correct at a glance. The conversion logic and the use of cv_bridge for ROS and OpenCV image conversions are appropriate.

If the error persists, it might not be related to the image conversion itself. Here are a few things to check:

1. Ensure that the topic ouster/rgb/image_raw is correctly subscribed to by the YOLOv3 node.
2. Verify that the images published on ouster/rgb/image_raw are visible and correctly formatted in rqt_image_view.
3. Check if there are any additional error messages or logs from the YOLOv3 node that could provide more insight into the failure.
4. Confirm that the YOLOv3 model is correctly loaded and configured to process mono8 images.

If everything seems to be in order with the image conversion and publishing, the issue might lie within the YOLOv3 ROS node's configuration or its handling of the incoming image messages. Double-check the YOLOv3 ROS node's documentation and ensure that all necessary parameters are set correctly.

If you continue to face difficulties, please provide the exact error message you're receiving from the YOLOv3 node after the conversion, and we'll try to troubleshoot further. Remember, the more specific the information you provide, the easier it will be to pinpoint the issue.

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