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Table 4 shows the results for the seven test sequences in terms of embedded capacity, modified macroblocks, modified motion vectors, PSNR Y difference, bit-rate, and the embedded cost.
Table 1 The embedded capacity of LUT and maximum embedding capacity.
On large block size, the embedded capacity is decreased and the number of extra bits also decreases.
In summary, G3 can be embedded more secret information, G2 is the second, and G1 is embedded less secret information, embedded capacity G3 > G2 > G1; H1 and H3 can be embedded more secret information, and H2 is embedded less secret information, embedded capacity H1 > H2 and H3 > H2.
If a large number of blocks have an extreme number of zero point, then embedding size will be high; in case of the tiniest zero point, then embedded capacity will be low because we cannot enlarge the space to shift the histogram.
Similar(55)
Most of the existing RT-based methods either require elaborate conversions among different bases, or have limited embedding capacity.
Experimental results have demonstrated that the proposed scheme can achieve better scrambling performance and higher embedding capacity.
However, the theoretical maximum embedding capacity of most reversible watermarking algorithms is only 1.0 bits per pixel (bpp).
Consequently, the proposed method achieves the embedding capacity larger than 1.0 bpp in single-pass embedding as well as bringing relatively low embedding distortion.
Experimental results show that the proposed scheme gives a significantly improved embedding capacity than previous approaches in the same level of embedding distortion.
However, their exclusion decreases embedding capacity.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com