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I want to read a depth image from ros. I subscribe to the /camera/aligned_depth_to_color/image_raw/compressed topic published by a intel realsense D435i camera. I get a sensor_msgs CompressedImage ros msg, the image has a 16UC1; jpeg compressed format. I use opencv to read the image: depth_image = bridge.compressed_imgmsg_to_cv2(image_depth,desired_encoding='passthrough') but it returns an image with values between 0-255. How can I get the depth value in mm for each pixel?

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https://github.com/IntelRealSense/realsense-ros/issues/2361#issuecomment-1160149057 and surrounding comments say to use compressedDepth instead, or uncompressed, /compressed 16UC1; jpeg compressed is unusable (because it was automatically created by ImageTransport, which in this case and others creates invalid image topics unless manually configured not to with disable_pub_plugins).

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  • $\begingroup$ Or avoid the compression pitfalls by subscribing to the uncompressed topic .../depth/image_rect_raw $\endgroup$
    – Mike973
    Commented Nov 1, 2023 at 15:12
  • $\begingroup$ thank you very much, I'll try this topic $\endgroup$
    – Franci
    Commented Nov 1, 2023 at 17:59

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