qccmatrixdct.3

QccPack-0.54-1 released (2007-04-30) is being developed and tested on Fedora Core Linux. QccPack pro

.TH QCCMATRIXDCT 3 "QCCPACK" ""
.SH NAME
QccMatrixDCT,
QccMatrixInverseDCT
\- two-dimensional discrete cosine transform (DCT) and inverse transform 
of a matrix
.SH SYNOPSIS
.B #include "libQccPack.h"
.sp
.BI "int QccMatrixDCT(const QccMatrix " input_block ", QccMatrix " output_block ", int " num_rows ", int " num_cols );
.br
.BI "int QccMatrixInverseDCT(const QccMatrix " input_block ", QccMatrix " output_block ", int " num_rows ", int " num_cols );
.SH DESCRIPTION
.B QccMatrixDCT()
calculates the two-dimensional discrete cosine transform (2D DCT) of
.IR input_block ,
returning the result in
.IR output_block .
.LP
.B QccMatrixDCT()
calculates the 2D DCT of
.IR input_block
by first taking a one-dimensional DCT along each
row of the matrix followed by 
the one-dimensional DCT along each column.
.BR QccVectorDCT (3)
is used to calculate the one-dimensional DCT in each case.
.LP
.B QccMatrixInverseDCT()
calculates the two-dimensional inverse DCT of
.IR input_block ,
returning the result in
.IR output_block .
.SH "RETURN VALUE"
Both
.B QccMatrixDCT()
and
.B QccMatrixInverseDCT()
return 0 on success, 1 on error.
.SH "SEE ALSO"
.BR QccVectorDCT (3),
.BR QccMatrix (3),
.BR QccPack (3)

A. K. Jain,
.IR "Fundamentals of Digital Image Processing" .
Englewood Cliffs, NJ: Prentice Hall, 1989.
.SH AUTHOR
Copyright (C) 1997-2007  James E. Fowler
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