eprintid: 1799
rev_number: 14
eprint_status: archive
userid: 6
dir: disk0/00/00/17/99
datestamp: 2013-09-18 09:46:51
lastmod: 2015-05-29 11:31:15
status_changed: 2013-09-18 09:46:51
type: conference_item
metadata_visibility: show
creators_name: Rusu, Cristian
creators_name: Tsaftaris, Sotirios A.
creators_id: cristian.rusu@imtlucca.it
creators_id: sotirios.tsaftaris@imtlucca.it
title: Estimation of Scribble Placement for Painting Colorization
ispublished: pub
subjects: ND
subjects: QA75
divisions: CSA
full_text_status: public
pres_type: paper
keywords: Cultural differences; Digital images; Gray-scale; Image color analysis; Image reconstruction; Painting; Signal processing algorithms
abstract: Image colorization has been a topic of interest since
the mid 70’s and several algorithms have been proposed that
given a grayscale image and color scribbles (hints) produce a colorized image. Recently, this approach has been introduced in the field of art conservation and cultural heritage, where B&W photographs of paintings at previous stages have been colorized. However, the questions of what is the minimum number of scribbles necessary and where they should be placed in an image remain unexplored. Here we address this limitation using an iterative algorithm that provides insights as to the relationship between locally vs. globally important scribbles. Given a color image we randomly select scribbles and we attempt to color the
grayscale version of the original.We define a scribble contribution measure based on the reconstruction error. We demonstrate our approach using a widely used colorization algorithm and images from a Picasso painting and the peppers test image. We show that areas isolated by thick brushstrokes or areas with high textural variation are locally important but contribute very little to the
overall representation accuracy. We also find that for the case of Picasso on average 10% of scribble coverage is enough and that flat areas can be presented by few scribbles. The proposed method can be used verbatim to test any colorization algorithm.
date: 2013
date_type: published
publisher: IEEE
pagerange: 564-569
event_title: 8th International Symposium on  Image and Signal Processing and Analysis (ISPA 2013)
event_location: Trieste, Italy
event_dates: September 4-6, 2013
event_type: conference
id_number: 10.1109/ISPA.2013.6703804
refereed: TRUE
isbn: 978-953-184-194-8
book_title: 8th International Symposium on  Image and Signal Processing and Analysis (ISPA 2013)
official_url: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6703804
related_url_url: http://www.isispa.org/
related_url_type: org
citation:   Rusu, Cristian and Tsaftaris, Sotirios A.  Estimation of Scribble Placement for Painting Colorization.  In: 8th International Symposium on Image and Signal Processing and Analysis (ISPA 2013), September 4-6, 2013, Trieste, Italy pp. 564-569.  ISBN 978-953-184-194-8.      (2013)  
document_url: http://eprints.imtlucca.it/1799/1/ISPA_color_final_Rusu_Tsaftaris_2013.pdf