2014 / Professor Johnson delivered the opening plenary ``Signal Processing in Computational Art History'' at the 2014 IEEE International Conference on Acoustics, Speech, and Signal Processing in Florence, Italy on May 6, 2014, in which he describes three projects he has initiated in computational art history: on canvas thread counting and rollmate identification, photographic paper texture similarity, and laid paper chain line pattern matching.


2017 / Professor Johnson delivered the Frick Collection Digital Art History Lab Lecture ``Using Computed Weave Maps to Gain Art-Historical Insight from Vermeer's Canvases'' on May 2, 2017, in which he describes weave matches, cusping, and weft snakes discovered in a study of full-painting x-radiographs of all 34 of Vermeer's paintings on canvas aided by weave thread density and angle maps - with implications regarding authentication, dating, and artist's intent.