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You first need to decompress your image, you can do so by adding following to your launch file

<node name="republish" type="republish" pkg="image_transport" output="screen" args="compressed in:=/compressed_image out:=/raw_image" />

Here is one post I found for blob detection using opencv for both python and c++. You will also need cv_bridge to convert your subscribed raw_image to opencv format.

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