Internal images of exhausting combustion outlet separated by classes (Ok, not-Ok)

Internal images of exhausting combustion outlet separated by classes (Ok, not-Ok).
These images were taken with an apparatus described in a work that autonomously takes photos with regular lighting of internal cylinders of combustion engines of 2 stroke engines. The photos are related to the exhausting window outlet and is meant to be used in a classification exercise of autonomously labeling as conform or Non-conform casting of the cylinders.