Handwritten Digit Images - Computer Vision Group at the University of São Paulo
The image database used in the experiments presented in our SIBGRAPI
2005 paper is available for download. For each one of the 10 digits,
10 binary images with approximately 672 digits each were obtained by
digitalizing (200 dpi) paper forms containing samples taken from various
subjects. While collecting the data, our objective was to simulate the writing
of digits in postal envelopes. The individuals were asked to write several
digits inside square regions. The images are separated into a training set
(70%) and a test set (30%), and are in PNG format.
Digit database (tar.gz file)
Digit database (zip file)
The images were collected by participants of the
VERASS project , a project that took place at IME-USP and was supported by
Olivetti do Brasil SA. Among the various people who collaborated in the
effort to collect the digits are Routo Terada, Junior Barrera,
Flavio Soares Corrêa da Silva, Francisco Zampirolli, Nina S. T. Hirata,
Roberto Hirata Jr., Roberto Cassio Araujo, and, of course, everyone
who had the patience to write the digits inside the boxes :-)
Reference
- Daniel André Vaquero, Junior Barrera and Roberto Hirata Jr. A Maximum-likelihood Approach for Multiresolution W-operator Design. In Proceedings of the XVIII Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI 2005), Natal, Brazil, Oct. 9-12, 2005. (PDF from Sibgrapi Digital Library)
Daniel André Vaquero
Last modified: Fri, 21 Oct 2005