This is a very new area where law has not caught up. Surely in any creative process (book author, painter) there is a process where the artist selects and omits elements before the final product.
Is not the selection and omission of poorly generated images the "human authorship" [1] necessary to qualify? Or can OP modify AI generated art meaningfully to qualify for copyright?
[1] https://www.smithsonianmag.com/smart-news/us-copyright-offic...