EMAN::Util::FakeKaiserBessel Class Reference

#include <util.h>

Inheritance diagram for EMAN::Util::FakeKaiserBessel:

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Collaboration diagram for EMAN::Util::FakeKaiserBessel:

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List of all members.

Public Member Functions

 FakeKaiserBessel (float alpha, int K, float r_, float v_, int N_, float vtable_=0.f, int ntable_=5999)
float sinhwin (float x) const
 Kaiser-Bessel Sinh window function.
float i0win (float x) const
 Kaiser-Bessel I0 window function.
void build_I0table ()
 2*pi*alpha*r*vadjust

Detailed Description

Definition at line 380 of file util.h.


Constructor & Destructor Documentation

EMAN::Util::FakeKaiserBessel::FakeKaiserBessel ( float  alpha,
int  K,
float  r_,
float  v_,
int  N_,
float  vtable_ = 0.f,
int  ntable_ = 5999 
) [inline]

Definition at line 382 of file util.h.

00439                 {


Member Function Documentation

void Util::FakeKaiserBessel::build_I0table (  )  [virtual]

2*pi*alpha*r*vadjust

Reimplemented from EMAN::Util::KaiserBessel.

Definition at line 2066 of file util_sparx.cpp.

References EMAN::Util::KaiserBessel::facadj, EMAN::Util::KaiserBessel::fltb, EMAN::Util::KaiserBessel::i0table, EMAN::Util::KaiserBessel::K, EMAN::Util::KaiserBessel::N, EMAN::Util::KaiserBessel::ntable, EMAN::Util::round(), sqrt(), and EMAN::Util::KaiserBessel::vadjust.

02066                                          {
02067         i0table.resize(ntable+1); // i0table[0:ntable]
02068         int ltab = int(round(float(ntable)/1.1f));
02069         fltb = float(ltab)/(K/2);
02070         float val0 = sqrt(facadj)*static_cast<float>(gsl_sf_bessel_I1(facadj));
02071         for (int i=ltab+1; i <= ntable; i++) i0table[i] = 0.f;
02072         for (int i=0; i <= ltab; i++) {
02073                 float s = float(i)/fltb/N;
02074                 if (s < vadjust) {
02075                         float rt = sqrt(1.f - pow(s/vadjust, 2));
02076                         i0table[i] = sqrt(facadj*rt)*static_cast<float>(gsl_sf_bessel_I1(facadj*rt))/val0;
02077                 } else {
02078                         i0table[i] = 0.f;
02079                 }
02080         }
02081 }

float Util::FakeKaiserBessel::i0win ( float  x  )  const [virtual]

Kaiser-Bessel I0 window function.

Reimplemented from EMAN::Util::KaiserBessel.

Definition at line 2057 of file util_sparx.cpp.

References EMAN::Util::KaiserBessel::facadj, sqrt(), and EMAN::Util::KaiserBessel::vadjust.

02057                                                {
02058         float val0 = sqrt(facadj)*float(gsl_sf_bessel_I1(facadj));
02059         float absx = fabs(x);
02060         if (absx > vadjust) return 0.f;
02061         float rt = sqrt(1.f - pow(absx/vadjust, 2));
02062         float res = sqrt(facadj*rt)*float(gsl_sf_bessel_I1(facadj*rt))/val0;
02063         return res;
02064 }

float Util::FakeKaiserBessel::sinhwin ( float  x  )  const [virtual]

Kaiser-Bessel Sinh window function.

Reimplemented from EMAN::Util::KaiserBessel.

Definition at line 2083 of file util_sparx.cpp.

References EMAN::Util::KaiserBessel::alphar, EMAN::Util::KaiserBessel::fac, and sqrt().

02083                                                  {
02084         float val0 = sinh(fac)/fac;
02085         float absx = fabs(x);
02086         if (0.0 == x) {
02087                 float res = 1.0f;
02088                 return res;
02089         } else if (absx == alphar) {
02090                 return 1.0f/val0;
02091         } else if (absx < alphar) {
02092                 float rt = sqrt(1.0f - pow((x/alphar), 2));
02093                 float facrt = fac*rt;
02094                 float res = (sinh(facrt)/facrt)/val0;
02095                 return res;
02096         } else {
02097                 float rt = sqrt(pow((x/alphar),2) - 1.f);
02098                 float facrt = fac*rt;
02099                 float res = (sin(facrt)/facrt)/val0;
02100                 return res;
02101         }
02102 }


The documentation for this class was generated from the following files:
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