Screengrab from research paper showing "The Old Guitarist", an X-radiograph of "The Old Guitarist", the content image constructed from the painting, a style image, Picasso's "La Vie", and the styled image "La Femme Perdue"

“We present a novel method of reconstructing lost artwork, by applying neural style transfer to x-radiographs of artwork with secondary interior artwork beneath a primary exterior, so as to reconstruct lost artwork”

Source : This Picasso painting had never been seen before. Until a neural network painted it. – MIT Technology Review