Review Article
A Comparative Analysis of Information Hiding Techniques for Copyright Protection of Text Documents
Table 15
Embedding capacity analysis of structural techniques (bits per doc).
| Algorithm name | Doc 1 | Doc 2 | Doc 3 | Doc 4 | Average capacity | Summary of embedding methods (BPL) |
| Bender et al., 1996 [44] | 73 | 74 | 5 | 42 | 49 | One bit per locations (interword spaces, end of the lines and between sentences) | Lee and Tsai, 2008 [42] | 210 | 210 | 6 | 117 | 135 | 3 bits per locations (interword spaces) | Cheng et al., 2010 [45] | 852 | 840 | 948 | 480 | 781 | 12 bits per locations (word colors) | Chou et al., 2012 [46] | 350 | 350 | 10 | 195 | 226 | 5 bits per locations (interword spaces) | Por et al., 2012 [22] | 148 | 150 | 12 | 86 | 98 | 2 bits per locations (interword, intersentence, end-of-line, and end of paragraph) | Taleby Ahvanooey and Tabasi, 2014 [15] | 6 | 28 | 20 | 14 | 17 | 2 bits per locations (after punctuation characters) | Taleby Ahvanooey et al., 2015 [16] | 48 | 224 | 160 | 42 | 118 | 16 bits per locations (after punctuation characters, between sentences and beginning of the paragraphs) | Taleby Ahvanooey et al., 2016 [11] | 120 | 180 | 120 | 180 | 150 | Total bits of watermark string per locations (one time watermark bits after dots (.)) | Alotaibi and Elrefaei, 2016 [19] (second) | 280 | 280 | 8 | 156 | 181 | 4 bits per locations (interword spaces) |
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