.TH WDRENCODE 1 "QCCPACK" "".SH NAMEwdrencode, wdrdecode \- encode/decode image from/to PGM/PPM format using the original Wavelet Difference Reduction (WDR) algorithm.SH SYNOPSIS.B wdrencode .RB "[\|" \-w .IR wavelet "\|]".RB "[\|" \-b.IR boundary "\|]" .RB "[\|" \-pw.IR pcpfile "\|]" .RB "[\|" \-nl.IR levels "\|]" .RB "[\|" \-m.IR mask "\|]" .RB "[\|" \-vo "\|]".I rate imgfile bitstream.B wdrdecode .RB "[\|" \-w .IR wavelet "\|]" .RB "[\|" \-b.IR boundary "\|]" .RB "[\|" \-pw.IR pcpfile "\|]" .RB "[\|" \-m.IR mask "\|]".RB "[\|" \-r.IR  rate "\|]".I bitstream imgfile.SH DESCRIPTION.TP.BI \-w " wavelet"String. Name of the wavelet file.RB ( FBKor .B LFTfor mat); default = "CohenDaubechiesFeauveau.9-7.lft"..TP.BI \-b " boundary"String. Type of boundary extension; default = "symmetric"..TP.BI \-pw " pcpfile"String. Name of file containing perceptual weights..TP.BI \-nl " levels"Integer. Number of levels of dyadic decomposition; default value is 5..TP.BI \-m " mask"String. Name of file containing the transperancy mask for shape-adaptivecoding..TP.BI \-r " rate"Float. Rate at which to stop decoding. Default is to decode untilend of input bitstream is reached..TP.B \-voPrint only the values of the rate to stdout (terse output); default is verbose output..SH DESCRIPTION.B wdrencodeencodes an image, .IR imgfile , using the Wavelet Difference Reduction (WDR) algorithm by Tian and Wells..LPThe transform is either the usual discretewavelet transform (DWT) or a shape-adaptiveDWT (SA-DWT); see.BR imgdwt (1)for complete details.Option.B \-wspecifies the wavelet, option.B \-bspecifies the boundary extension, and option.B \-pwindicates whether perceptual weighting is to be used.The.B \-moption gives the image file to be used as a transparency maskfor the SA-DWT..I maskmust be a grayscale imagein which black in this image indicates transparency, whiteindicates full opacity, and gray tones are degrees oftranslucence(see.BR QccAlpha (3)).If the.B \-moption is not given, the usual DWT is used..LPThe desired bitrate of the output.I bitstreamis specified by.IR rate ,which is expressed in bits per pixel of the original image..B wdrencodenormally prints to stdout a small amount of informationconcerning this target bitrate and the actual bitrate achieved.Usually these rates are identical, but may differ slightly.If the .B \-vo(value-only) option is given, all printed output is suppressed except forthe actual bitrate..LP.B wdrdecodeperforms the corresponding decoding using the WDR algorithm, decodingthe.I bitstreammade by.B wdrencodeand producinga reconstructed image,.IR imgfile .For sane results, .IR wavelet ,.IR boundary ,and.I pcpfileshould be the same as they were for.BR wdrencode ,and.I maskshould be the same if an SA-DWT was used as the transform.If a decoding rate is specified with the.B \-roption, then.B wdrdecodestops decoding when.I ratebits per pixel from the input bitstreamhave been decoded. Otherwise, decoding stops when theend of the input bitstream is reached..LP.B wdrencodeand.B wdrdecodecall.BR QccWAVwdrEncode (3) and .BR QccWAVwdrDecode (3), respectively, to perform WDR encoding and decoding. Refer to the man pages of these functions for more information..SH "SEE ALSO".BR QccWAVwdrEncode (3),.BR QccWAVwdrDecode (3),.BR imgdwt (1),.BR imgdist (1),.BR QccBitBuffer (3),.BR QccENTArithmeticEncode (3),.BR QccENTArithmeticDecode (3),.BR QccWAVPerceptualWeights (3),.BR QccWAVSubbandPyramid (3),.BR QccPackWAV (3),.BR QccPackIMG (3),.BR QccPack (3)J. Tian and R. O. Wells, Jr.,"Embedded Image Coding Using Wavelet Difference Reduction", in.IR "Wavelet Image and Video Compression" , P. N. Topiwala, Ed., pp. 289-302,Kluwer Academic Publishers, Norwell, MA, 1998..SH AUTHORWritten by Yufei Yuan <yuanyufei@hotmail.com>Copyright (C) 1997-2005  James E. Fowler.\"  The programs herein are free software; you can redistribute them and/or.\"  modify them under the terms of the GNU General Public License.\"  as published by the Free Software Foundation; either version 2.\"  of the License, or (at your option) any later version..\"  .\"  These programs are distributed in the hope that they will be useful,.\"  but WITHOUT ANY WARRANTY; without even the implied warranty of.\"  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the.\"  GNU General Public License for more details..\"  .\"  You should have received a copy of the GNU General Public License.\"  along with these programs; if not, write to the Free Software.\"  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.