/usr/include/dcmtk/dcmimgle/displint.h is in libdcmtk2-dev 3.6.0-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright (C) 1996-2010, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: dcmimgle
*
* Author: Joerg Riesmeier
*
* Purpose: DiCubicSpline Function/Interpolation (Header/Implementation)
*
* Last Update: $Author: joergr $
* Update Date: $Date: 2010-10-14 13:16:27 $
* CVS/RCS Revision: $Revision: 1.21 $
* Status: $State: Exp $
*
* CVS/RCS Log at end of file
*
*/
#ifndef DISPLINT_H
#define DISPLINT_H
#include "dcmtk/config/osconfig.h"
#include "dcmtk/ofstd/ofcast.h"
#define INCLUDE_CSTDDEF /* For NULL */
#include "dcmtk/ofstd/ofstdinc.h"
/*--------------------*
* macro definition *
*--------------------*/
// SunCC 4.x does not support default values for template types :-/
#define T3_ double
/*------------------*
* template class *
*------------------*/
/** Template class for cubic spline interpolation
*/
template <class T1, class T2 /*, class T3 = double*/>
class DiCubicSpline
{
public:
/** calculate spline function for given points.
* T1 = type of x coordinates
* T2 = type of y coordinates
* T3_ = type of y coordinates of the spline function
*
** @param x array with x coordinates of given points
* @param y array with y coordinates of given points
* @param n number of entries in array (= points)
* @param y2 array used to store the resulting spline function (used for CubicSplineInterpolation)
* @param yp1 first derivative of the interpolating function at point 1
* @param ypn first derivative of the interpolating function at point n
*
** @return true if successful, false otherwise
*/
static int Function(const T1 *x,
const T2 *y,
const unsigned int n,
T3_ *y2,
const T3_ yp1 = 1.0e30,
const T3_ ypn = 1.0e30)
{
if ((x != NULL) && (y != NULL) && (n > 0) && (y2 != NULL))
{
T3_ *u = new T3_[n]; // temporary vector
if (u != NULL)
{
register unsigned int i;
T3_ p, qn, sig, un;
if (yp1 > 0.99e30) // ignore value for first derivative at point 1
y2[0] = u[0] = 0.0;
else
{
y2[0] = -0.5;
u[0] = (3.0 / (OFstatic_cast(T3_, x[1]) - OFstatic_cast(T3_, x[0]))) *
((OFstatic_cast(T3_, y[1]) - OFstatic_cast(T3_, y[0])) /
(OFstatic_cast(T3_, x[1]) - OFstatic_cast(T3_, x[0])) - yp1);
}
for (i = 1; i < n - 1; ++i)
{
sig = (OFstatic_cast(T3_, x[i]) - OFstatic_cast(T3_, x[i - 1])) /
(OFstatic_cast(T3_, x[i + 1]) - OFstatic_cast(T3_, x[i - 1]));
p = sig * y2[i - 1] + 2.0;
y2[i] = (sig - 1.0) / p;
u[i] = (OFstatic_cast(T3_, y[i + 1]) - OFstatic_cast(T3_, y[i])) /
(OFstatic_cast(T3_, x[i + 1]) - OFstatic_cast(T3_, x[i])) -
(OFstatic_cast(T3_, y[i]) - OFstatic_cast(T3_, y[i - 1])) /
(OFstatic_cast(T3_, x[i]) - OFstatic_cast(T3_, x[i - 1]));
u[i] = (6.0 * u[i] / (OFstatic_cast(T3_, x[i + 1]) -
OFstatic_cast(T3_, x[i - 1])) - sig * u[i - 1]) / p;
}
if (ypn > 0.99e30) // ignore value for first derivative at point 1
qn = un = 0.0;
else
{
qn = 0.5;
un = (3.0 / (OFstatic_cast(T3_, x[n - 1]) - OFstatic_cast(T3_, x[n - 2]))) *
(ypn - (OFstatic_cast(T3_, y[n - 1]) - OFstatic_cast(T3_, y[n - 2])) /
(OFstatic_cast(T3_, x[n - 1]) - OFstatic_cast(T3_, x[n - 2])));
}
y2[n - 1] = (un - qn * u[n - 2]) / (qn * y2[n - 2] + 1.0);
for (i = n - 1; i > 0; --i)
y2[i - 1] = y2[i - 1] * y2[i] + u[i - 1];
delete[] u;
return 1;
}
}
return 0;
}
/** perform cubic spline interpolation for given points.
* T1 = type of x coordinates
* T2 = type of y coordinates
* T3_ = type of y coordinates of the spline function
*
** @param xa array with x coordinates of given points
* @param ya array with y coordinates of given points
* @param y2a array used to store the resulting spline function (calculated by CubicSplineFunction)
* @param na number of entries in above arrays (xa, ya and y2a)
* @param x array with x coordinates of points to be interpolated
* @param y array used to store interpolated values
* @param n number of entries in above array (x and y)
*
** @return true if successful, false otherwise
*/
static int Interpolation(const T1 *xa,
const T2 *ya,
const T3_ *y2a,
const unsigned int na,
const T1 *x,
T2 *y,
const unsigned int n)
{
if ((xa != NULL) && (ya != NULL) && (y2a != NULL) && (na > 0) && (x != NULL) && (y != NULL) && (n > 0))
{
register unsigned int k, i;
register unsigned int klo = 0;
register unsigned int khi = na - 1;
T3_ h, b, a;
for (i = 0; i < n; ++i)
{
if ((xa[klo] > x[i]) || (xa[khi] < x[i])) // optimization
{
klo = 0;
khi = na - 1;
}
while (khi - klo > 1) // search right place in the table, if necessary
{
k = (khi + klo) >> 1;
if (xa[k] > x[i])
khi = k;
else
klo = k;
}
if (xa[khi] == x[i]) // optimization: use known values
y[i] = ya[khi];
else
{
h = OFstatic_cast(T3_, xa[khi]) - OFstatic_cast(T3_, xa[klo]);
if (h == 0.0) // bad xa input, values must be distinct !
return 0;
a = (OFstatic_cast(T3_, xa[khi]) - OFstatic_cast(T3_, x[i])) / h;
b = (OFstatic_cast(T3_, x[i]) - OFstatic_cast(T3_, xa[klo])) / h;
y[i] = OFstatic_cast(T2, a * OFstatic_cast(T3_, ya[klo]) + b * OFstatic_cast(T3_, ya[khi]) +
((a * a * a - a) * y2a[klo] + (b * b * b - b) * y2a[khi]) * (h * h) / 6.0);
}
}
return 1;
}
return 0;
}
};
#endif
/*
*
* CVS/RCS Log:
* $Log: displint.h,v $
* Revision 1.21 2010-10-14 13:16:27 joergr
* Updated copyright header. Added reference to COPYRIGHT file.
*
* Revision 1.20 2010-03-01 09:08:47 uli
* Removed some unnecessary include directives in the headers.
*
* Revision 1.19 2005-12-08 16:48:10 meichel
* Changed include path schema for all DCMTK header files
*
* Revision 1.18 2003/12/23 15:53:22 joergr
* Replaced post-increment/decrement operators by pre-increment/decrement
* operators where appropriate (e.g. 'i++' by '++i').
*
* Revision 1.17 2003/12/08 19:20:47 joergr
* Adapted type casts to new-style typecast operators defined in ofcast.h.
* Removed leading underscore characters from preprocessor symbols (reserved
* symbols). Updated copyright header.
*
* Revision 1.16 2002/07/18 12:30:59 joergr
* Removed unused code.
*
* Revision 1.15 2001/06/01 15:49:51 meichel
* Updated copyright header
*
* Revision 1.14 2000/03/08 16:24:24 meichel
* Updated copyright header.
*
* Revision 1.13 2000/02/02 14:33:54 joergr
* Replaced 'delete' statements by 'delete[]' for objects created with 'new[]'.
*
* Revision 1.12 1999/10/21 08:29:42 joergr
* Renamed template type definition from 'T3' to 'T3_' to avoid naming
* conflicts.
*
* Revision 1.11 1999/10/20 18:38:50 joergr
* Eliminated default values for template types since this features is not
* supported by SunCC 4.x (temporarily introduced '#define' instead).
*
* Revision 1.10 1999/10/15 09:38:31 joergr
* Fixed typos.
*
* Revision 1.9 1999/10/14 19:05:17 joergr
* Fixed typo.
*
* Revision 1.8 1999/10/01 13:25:35 joergr
* Enhanced template class for cubic spline interpolation to support
* non-floating point classes/types as y-coordinates.
*
* Revision 1.7 1999/07/23 14:11:25 joergr
* Added preliminary support for 2D bi-cubic spline interpolation (currently
* not used).
*
* Revision 1.6 1999/05/03 11:09:31 joergr
* Minor code purifications to keep Sun CC 2.0.1 quiet.
*
* Revision 1.5 1999/04/29 13:49:08 joergr
* Renamed class CubicSpline to DiCubicSpline.
*
* Revision 1.4 1999/03/24 17:20:26 joergr
* Added/Modified comments and formatting.
*
* Revision 1.3 1999/03/22 08:52:43 joergr
* Added/Changed comments.
*
* Revision 1.2 1999/02/25 16:17:16 joergr
* Initialize local variables to avoid compiler warnings (reported by gcc
* 2.7.2.1 on Linux).
*
* Revision 1.1 1999/02/11 16:36:29 joergr
* Renamed file to indicate the use of templates.
*
* Revision 1.2 1999/02/09 14:21:54 meichel
* Removed default parameters from template functions, required for Sun CC 4.2
*
* Revision 1.1 1999/02/04 17:59:23 joergr
* Added support for calibration according to Barten transformation (incl.
* a DISPLAY file describing the monitor characteristic).
*
*
*/
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