absValue

Name

absValue, fftAmp - take the absolute value of a band

Syntax

 #include <xite/negate.h>

 int absValue( IBAND b1, IBAND b2 );

 #include <xite/fft.h>

 int fftAmp( IC_BAND in_band, IR_BAND out_band );

Description

absValue takes the absolute value of b1 into b2. Only largest common rectangle is handled.

Accepts all pixel types. Both bands must have the same pixel type, except that if b1 is complex, then b2 may be either complex or real, and if b1 is double complex, then b2 may be either double complex or double.

Identical in- and out- parameters are legal.

Absolute value of a complex pixel is

 sqrt(re * re + im * im)

fftAmp is retained for compatibility with previous XITE versions. It is a macro call to absValue.

Return value

 0 => ok
 1 => Bands have unknown pixel type
 2 => Illegal combination of pixel types

Author

Tor Lønnestad, BLAB, IfI, UiO

Modified

Svein Bøe

Id

$Id: absValue.c,v 1.30 1997/01/29 10:43:47 svein Exp $