If by "recently" you mean 944AD... or even the second century.
The Sermon of Gregory Referendarius, Arch Deacon of the Hagia Sophia Cathedral in Constantinople contains descriptions of the image on the Shroud. The Hymn of the Pearl, found in the Gospel of Thomas, dated to the 2nd Century, describes the grave clothes as being like a mirror with Christ observing himself, both front and back sides of himself.
The image has always been there... what we did not know until Secondo Pia photographed it for the first time in 1898, was that the image was apparently a negative image and when looked at on the negative photographic plate, it was a positive image.
it’s what I meant...the NEGATIVE image.