2007 / TCAP founded by Rick Johnson (Cornell)
following success with one-dimensional Fourier transform in counting
threads crossing a test line drawn on a digitized x-radiograph of
a van Gogh painting in the collection of the
Van Gogh Museum.
2008 / Cornell students supervised by Rick Johnson
compose computer-assisted hand count dataset for
1000 two cm squares extracted from x-radiographs
of van Gogh paintings
used to determine winning algorithms among those provided by teams
from University of Wisconsin, WPI, and Rice University.
2009 / As architect of winning thread-counting software
(based on two-dimensional Fourier transform),
Don Johnson (Rice) joins Rick Johnson as co-director of TCAP.
2009 / First published weave maps and weave
pattern match presented at annual
2009 / First TCAP annual report
2010 / Rob Erdmann (Arizona) joins Rick Johnson and Don
Johnson as a co-director
of TCAP and adds his big data computing/visualization
skills - including composite image stitching software.
2010 / The relationship between weave matches
and rollmate status described at annual
2010 / Second TCAP annual report
2011 / First journal paper on utility of spectral-based
thread counting appears in
Studies in Conservation
2011 / TCAP status report
by museum/artist/project rather than technical tasks in response
to expanding workload, as the number of paintings
examined exceeds 600.
2011 / Weave maps from TCAP included in
new on-line catalog
of impressionists at Art Institute of Chicago.
2012 / First papers appear in art history journals
- The Burlington Magazine
Metropolitan Museum Journal
illustrating the art historical uses of automated thread
counting and weave matching in studies of
2013 / A full description of the
for thread counting and weave matching is published in
the technical journal Signal Processing
2013 / Rick Johnson and Don Johnson speak
on their multi-year effort to "count" van Gogh at the Symposium on
"Van Gogh's Studio Practice in Context"
with the exhibition "Van Gogh at Work" at the Van Gogh Museum.
2013 / Papers on weft snakes
and interpreting weave matches
appear in on-line conservation journal
2013 / Rick Johnson steps down as a co-director of TCAP to put more
time into computational art history for paper, e.g. 20th century
in pre-1750 prints, and Rob Erdmann assumes lead
role in TCAP and its
extension via advanced visualization tools
2014 / A dataset of TCAP
composites of scanned x-radiographs of 10 paintings on canvas
in the collections of the Van Gogh Museum and
the Rijksmuseum is made available
Netherlands Insitute for Art History
, thereby enabling other signal processing researchers
to develop their own automated thread counting schemes.