Bit-Plane Decomposition Steganography Combined with JPEG2000 by Noda, Spaulding, Shirazi, Niimi, Kawaguchi PDF

By Noda, Spaulding, Shirazi, Niimi, Kawaguchi

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Additional info for Bit-Plane Decomposition Steganography Combined with JPEG2000 Compression

Example text

The name on the left side of a rule is a symbol or term. By convention, all tokens are considered to be symbols, but there are also symbols that are not tokens. ‡ CFGs are also known as phrase-structure grammars or type-3 languages. Computer theorists and naturallanguage linguists independently developed them at about the same time in the late 1950s. If you’re a computer scientist, you usually call them CFGs, and if you’re a linguist, you usually call them PSGs or type-3, but they’re the same thing.

N %% { addref(yylineno, curfilename, yytext, 0); } /* ignore everything else */ Concordances usually don’t index common short words, so the first set of patterns matches and ignores them. An action consisting solely of a vertical bar tells flex that the action for this rule is the same as the action for the next rule. The action on the last ignored word to does nothing, which is all we need to do to ignore a word. The next rule is the meat of the scanner and matches a reasonable approximation of an English word.

The obvious operator to use for OR is a vertical bar, but that’s already the unary absolute value operator. What happens if you also use it as a binary OR operator, for example, exp ABS factor? 4. Does the handwritten version of the scanner from Example 1-4 recognize exactly the same tokens as the flex version? 5. Can you think of languages for which flex wouldn’t be a good tool to write a scanner? 6. Rewrite the word count program in C. Run some large files through both versions. Is the C version noticeably faster?

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Bit-Plane Decomposition Steganography Combined with JPEG2000 Compression by Noda, Spaulding, Shirazi, Niimi, Kawaguchi

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