NAME

SYNOPSIS

rdwtblockdecode [-fp] [-hp] [-qp] [-ep] [-f1 filter1] [-f2 filter2] [-f3 filter3] [-w wavelet] [-b boundary] [-mv mvfile] [-q] bitstream sequence

DESCRIPTION

-fp

Full-pixel accuracy.

-hp

Half-pixel accuracy.

-qp

Quarter-pixel accuracy.

-ep

Eighth-pixel accuracy.

-f1 filter1

String. Filename of filter to use for going from full-pixel to half-pixel accuracy.

-f2 filter2

String. Filename of filter to use for going from half-pixel to quarter-pixel accuracy.

-f3 filter3

String. Filename of filter to use for going from quarter-pixel to eighth-pixel accuracy.

-w wavelet

String. Name of the wavelet file (FBK or LFT for mat); default = "CohenDaubechiesFeauveau.9-7.lft".

-b boundary

String. Type of boundary extension; default = "symmetric".

-nl num_levels

Integer. Number of levels of wavelet-transform decomposition; default value is 3.

-mv mvfile

String. Name of file to which to read or write motion vectors. Filename should contain a printf(3) -style numerical descriptor which will be filled in with the current frame number.

-rmw

Read motion vectors from specified file.

-bs blocksize

Integer. Block size to use in full-search block matching; default value is 8.

-sf startframe

Integer. Frame at which to start encoding. Default is first available frame.

-ef endframe

Integer. Frame at which to end encoding. Default is last available frame.

-q

Be quiet---do not print any frame statistics to stdout; default is verbose output.

DESCRIPTION

Option -w specifies the wavelet, while option -b specifies the boundary extension, for both the critically sampled DWT and RDWT used by the algorithm.

The desired bitrate of the output bitstream is specified by rate, which is expressed in bits per pixel of the original image sequence.

rdwtblockdecode performs the corresponding decoding using the RDWT-block algorithm, decoding the bitstream made by rdwtblockencode and producing a reconstructed image sequence, sequence. For sane results, wavelet and boundary should be the same as they were for rdwtblockencode.

For both encoding and decoding, sequence should indicate a collection of grayscale images of the same size stored as separate, numbered files; the filename indicated by sequence must contain one printf(3) -style numerical descriptor which will then be filled in the current frame number (e.g., football.%03d.pgm will become football.000.pgm, football.001.pgm, etc.; see QccPackIMG(3) ).

Both rdwtblockencode and rdwtblockdecode normally print to stdout a small amount of information after each frame is coded/decoded. If the -q (quiet) option is given, all printed output is suppressed.

rdwtblockencode and rdwtblockdecode call QccVIDRDWTBlockEncode(3) and QccVIDRDWTBlockDecode(3) , respectively, to perform RDWT-block encoding and decoding. Refer to the man pages of these functions for more information.

If the -mv option is specified to rdwtblockencode, motion vectors are written to mvfile via QccVIDMotionVectorsWriteFile(3) , unless -rmw is also specified, in which case, the motion-estimation process of rdwtblockencode is circumvented, and the motion vectors are read from mvfile via QccVIDMotionVectorsReadFile(3) . For rdwtblockdecode, if mvfile is specified, motion vectors are read from the file rather than from the encoded bitstream via QccVIDMotionVectorsReadFile(3) . mvfile should have a printf(3) -style numerical descriptor which will be filled in with the current frame number before reading or writing motion vectors.

SEE ALSO

H.-W. Park and H.-S. Kim, "Motion Estimation Using Lowband-Shift Method for Wavelet-Based Moving-Picture Coding," IEEE Transactions on Image Processing, vol. 9, no. 4, pp. 577-587, April 2000.

AUTHOR

Copyright (C) 1997-2021 James E. Fowler

Table of Contents

• NAME
• SYNOPSIS
• DESCRIPTION
• DESCRIPTION
• SEE ALSO
• AUTHOR