1. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. The process of compression/decompression used in our method. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013

2. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. A piece of text. Sometimes two or more character images can be considered one binary object to be coded. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013

3. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. Matching two different binary objects. A rigid translation around the center of mass was made to find a better matching. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013

4. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. Five different objects that belong to the same class, according to a threshold of 0.15, taken from their Tanimoto distance. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013

5. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. The visual meaning of the 3OT code. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013

6. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. Chain code representation of the object class shown in Fig. 4. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013

7. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. Comparison of an image with its decoded compressed version: (a) original; (b) restored. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013

8. Date of download: 7/8/2016 Copyright © 2016 SPIE. All rights reserved. [(a), (c), and (e)] Original images versus [(b), (d), and (f)] restored images. Figure Legend: From: Binary document image compression using a three-symbol grouped code dictionary J. Electron. Imaging. 2012;21(2):023013-1-023013-12. doi:10.1117/1.JEI.21.2.023013