1. On the following slides some examples from various digital library pages are shown These examples show that the traditional compression techniques are not suitable for the presentation of scanned documents on WWW Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 6

2. The JPEG compression technique has been used. The artifacts are clearly seen when the image is magnified Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 7

3. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 8

4. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 9

5. Here the quality of the presentation is much better, at the expense of the large amount of data stored in the JPEG file. However the blocking artifacts are clearly seen. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 10

6. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 11

7. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 12

8. Here GIF format was used. In order to decrease the file size, low resolution was chosen. This results in a very poor quality of the presentation. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 13

9. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 14

10. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 15

11. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 16

12. TEST IMAGE USED FOR THE COMPARISONS OF THE EFFICIENCY OF DIFFERENT FORMATS ( SIZE 25 MB ) Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 17

13. TEST IMAGE COMPRESSED USING JPEG ( SIZE 200 KB). Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 18

14. Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 19

15. THE QUALITY IS VERY POOR, COLORS HAS BEEN CHANGED AND BLOCKING ARTIFACTS ARE VISIBLE Advanced Techniques in Processing Images Advanced Techniques in Processing Images Chapter 6. Slide 20