http://revach.net/article.php?id=1449

Section: Halacha   Category: Tshuvos
Rav Shmuel Wosner: Can A Baal Korei Read The Torah With A Transparent Overlay
Rav Wosner was asked (Shevet HaLevi 8:29) about an ingenious idea for a Shul without a Baal Korei.  You make a transparent overlay with Nikudos and taamim and place it on the words of the Sefer Torah.  This way you are reading the actual Sefer Torah and any amateur can become a professional Baal Korei without mistakes.

He answers that technically this is permitted since reading through plastic or glass is considered reading the actual scroll.  However, he says that he does not feel comfortable giving his stamp to this new innovation.  He suggests solving the problem in the traditional way, which is for someone with a Chumash to whisper into the ear of the Baal Korei and the Baal Korei read from the Sefer Torah.  He also comments that this is different than reading through eye glasses which is perfectly acceptable.

 Disclaimer: We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. Please also understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.