On the following slides some examples from various digital library pages are shown These examples show that the traditional compression techniques are.

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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