qccvectordct.3

QccPack implementation in C

.TH QCCVECTORDCT 3 "QCCPACK" ""
.SH NAME
QccVectorDCT, QccVectorInverseDCT
\- one-dimensional discrete cosine transform (DCT) and inverse tranform 
of a signal vector
.SH SYNOPSIS
.B #include "libQccPack.h"
.sp
.BI "int QccVectorDCT(const QccVector " input_signal ", QccVector " output_signal ", int " signal_length );
.br
.BI "int QccVectorInverseDCT(const QccVector " input_signal ", QccVector " output_signal ", int " signal_length );
.SH DESCRIPTION
.B QccVectorDCT()
calculates the one-dimensional discrete cosine transform (DCT) of
.IR input_signal .
The result is returned in
.IR output_signal ,
which must be allocated prior to calling
.BR QccVectorDCT() .
Both 
.I input_signal
and
.I output_signal
have the same length,
.IR signal_length .
.LP
.B QccVectorInverseDCT()
calculates the inverse DCT of
.IR input_signal ,
returning its results in
.IR output_signal .
.SH "RETURN VALUE"
Both
.B QccVectorDCT()
and
.B QccVectorInverseDCT()
return 0 on success, 1 on error.
.SH "SEE ALSO"
.BR QccVector (3),
.BR QccPack (3)

A. K. Jain,
.IR "Fundamentals of Digital Image Processing" .
Englewood Cliffs, NJ: Prentice Hall, 1989.
.SH NOTES
Both
.B QccVectorDCT()
and
.B QccVectorInverseDCT()
use very slow, yet straightforward, implementations
of the DCT and IDCT.
.SH AUTHOR
Copyright (C) 1997-2005  James E. Fowler
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