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Does image load if you dont use $(find lsi_node) ?

Try loading:

img = cvLoadImage("herramientas.jpg", CV_LOAD_IMAGE_COLOR);

and put herramientas.jpg into ~/.ros directory. If it works you can change working directory to $(find lsi_node) for this node with your launch file.

$(find lsi_node) in code code may not work as wanted, bacause it is not a launch file. You could try to work with:

 `rospack find lsi_node`