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Well your bag files only contains the compressed images, not the raw ones. If you can, i suggest recreating the bag file with the raw images instead.
It seems that takes a second argument with the transport to use. Not sure if the following works, but you can give it a try:
<launch>
<node pkg="rosbag" type="play" name="rosbag" args="-d 2 /home/marce/Documents/Recordings/exp_21_02_1st_doc/ultra_back.bag"/>
<node name="extract" pkg="image_view" type="extract_images" respawn="false" output="screen" cwd="ROS_HOME" args="compressed">
<remap from="image" to="/ReMeDi_cam/image_raw"/>
</node>
</launch>
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