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while you can try to augment your images (if you do it manually), you probably shouldn't. real life problems need real life data (and a ton of images). any attempts at "faking it" will simply result in a bad classifier.

also note, that the whole cascade based object detection is deprecated, you should use a dnn based classifier instead. latest opencv4 also does no more include the tools to train cascades, or the cuda version of it.