He can't do that without committing perjury.
At this point, a non-self-aware AI is neither a purely technical device under the control of a person, nor is it a person eligible for copyright.
There is therefore no entity eligible to receive a copyright of an image created by an AI.
There is only one option: The image is public domain, permanently copyright ineligible.
I propose a simple test: Any AI that attempts to claim copyright must, in its own non-preprogrammed words, explain how it would benefit from owning a copyright. If a human either a. tries to claim copyright of an AI-created work, or b. programs an AI to articulate that the AI would benefit from owning a copyright without said AI figuring it out on its own, then that human goes to prison for fraud.