A Practical DCT based Blind Image Watermarking Scheme for Print-and-Scan Process

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12-19-2009

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A Practical DCT based Blind Image Watermarking Scheme for Print-and-Scan Process

HPL-2009-373 A Practical DCT based Blind Image Watermarking Scheme for Print-and-Scan Process - Jin, Jianming; Xiong, Yuhong; Hou, Huiman
Keyword(s): blind image watermarking, print-and-scan, information hiding, image processing, block-DCT
Abstract: Blind image watermarking technologies allow information to be embedded in common digital images and then recover from the watermarked images without the original images. However, the embedded information is often damaged after the print-and-scan process, because of the randomly added noises, the alt ...
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pdfimages

pdfimages(1)						      General Commands Manual						      pdfimages(1)

NAME

       pdfimages - Portable Document Format (PDF) image extractor (version 3.00)

SYNOPSIS

       pdfimages [options] PDF-file image-root

DESCRIPTION

       Pdfimages saves images from a Portable Document Format (PDF) file as Portable Pixmap (PPM), Portable Bitmap (PBM), or JPEG files.

       Pdfimages  reads  the PDF file PDF-file, scans one or more pages, and writes one PPM, PBM, or JPEG file for each image, image-root-nnn.xxx,
       where nnn is the image number and xxx is the image type (.ppm, .pbm, .jpg).

OPTIONS

       -f number
	      Specifies the first page to scan.

       -l number
	      Specifies the last page to scan.

       -j     Normally, all images are written as PBM (for monochrome images) or PPM (for non-monochrome images) files.  With this option,  images
	      in DCT format are saved as JPEG files.  All non-DCT images are saved in PBM/PPM format as usual.

       -opw password
	      Specify the owner password for the PDF file.  Providing this will bypass all security restrictions.

       -upw password
	      Specify the user password for the PDF file.

       -q     Don't print any messages or errors.

       -v     Print copyright and version information.

       -h     Print usage information.	(-help and --help are equivalent.)

EXIT CODES

       The Xpdf tools use the following exit codes:

       0      No error.

       1      Error opening a PDF file.

       2      Error opening an output file.

       3      Error related to PDF permissions.

       99     Other error.

AUTHOR

       The pdfimages software and documentation are copyright 1998-2004 Glyph & Cog, LLC.

SEE ALSO

       pdftops(1), pdftotext(1), pdfinfo(1), pdffonts(1), pdftoppm(1),

								  22 January 2004						      pdfimages(1)

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