MASTER THESIS Video Watermarking - Computer Graphics Group ...

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Table 2: Perceptibility test results. Probabilities of detection success in non-attacked sequences and bit-rate growth ratios in addition.
The third and the fourth row sets contain the bit-rate growth ratio in percent to the former bit-rate over either all slices or I slices only. Block method increases bit-rate less in comparison with coefficient method because when 0 is embedded, a half of transform coefficients are zeroed in block method while only one coefficient is zeroed in coefficient method. Anyway, bit-rate is increased the most when using noise method. This is mostly obvious in Renaissance because of many uniform areas which are represented by small amount of data in the former compressed video stream. Each test iteration has been executed with five different copy IDs; values in the table are average values of corresponding five results. Figure 15 and Figure 16 show the difference between the original picture and the watermarked one using noise method with weight factor of 20 for demonstration. Figure 15: Original picture Figure 16: Watermarked picture Because of inter coded pictures may use watermarked pictures as reference pictures in inter prediction, distortion caused by watermark embedding propagates, as visible in Figure 17 and Figure 18. Therefore, the inter prediction compensation is to be implemented in future work. Figure 17: Original inter coded picture Figure 18: Distorted inter coded picture In practice, weight factor of 2 is a good compromise between robustness and perceptibility. 37
Page 1 and 2: Charles University in Prague Facult
Page 3 and 4: Table of Contents Abstract 5 1 Intr
Page 5 and 6: Název práce: Watermarking videa A
Page 7 and 8: information about copyright owner a
Page 9 and 10: Common geometric distortions - the
Page 11 and 12: watermark, i.e. values of the water
Page 13 and 14: Chapter 3 The H.264 Standard The H.
Page 15 and 16: There are three types of slices: I,
Page 17 and 18: frequency transform. The choice is
Page 19 and 20: Chapter 4 Implementation Details Th
Page 21 and 22: auxiliary coded pictures), Supplem
Page 23 and 24: an intra coded slice, content ID -
Page 25 and 26: samples is subtracted from the resi
Page 27 and 28: At the beginning of the entire proc
Page 29 and 30: file in order to provide detailed r
Page 31 and 32: as a part of the whole process. The
Page 33 and 34: coefficients are hardly set to non-
Page 35: Table 1 outlines characteristics of
Page 39 and 40: Using block method, we cannot consi
Page 41 and 42: probabilities of watermark detectio
Page 43 and 44: 5.4.3 Cropping In the cropping test
Page 45 and 46: 5.4.6 Blurring Blurring can be cons
Page 47 and 48: 5.4.8 Multiple Watermark Embedding
Page 49 and 50: Despite the expectations, all the m
Page 51 and 52: ecompression and noising, and to so
Page 53 and 54: Bibliography [1] Ingemar J. Cox, Jo
Page 55 and 56: Appendix A Enclosed CD & Installati
Page 57 and 58: Appendix B The plugin usage The wat
Page 59: length is the length of the list of

MASTER THESIS Video Watermarking - Computer Graphics Group ...

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