#include <util.h>
Inheritance diagram for EMAN::Util::FakeKaiserBessel:
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 |
Definition at line 380 of file util.h.
EMAN::Util::FakeKaiserBessel::FakeKaiserBessel | ( | float | alpha, | |
int | K, | |||
float | r_, | |||
float | v_, | |||
int | N_, | |||
float | vtable_ = 0.f , |
|||
int | ntable_ = 5999 | |||
) | [inline] |
void Util::FakeKaiserBessel::build_I0table | ( | ) | [virtual] |
2*pi*alpha*r*vadjust
Reimplemented from EMAN::Util::KaiserBessel.
Definition at line 2062 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.
02062 { 02063 i0table.resize(ntable+1); // i0table[0:ntable] 02064 int ltab = int(round(float(ntable)/1.1f)); 02065 fltb = float(ltab)/(K/2); 02066 float val0 = sqrt(facadj)*static_cast<float>(gsl_sf_bessel_I1(facadj)); 02067 for (int i=ltab+1; i <= ntable; i++) i0table[i] = 0.f; 02068 for (int i=0; i <= ltab; i++) { 02069 float s = float(i)/fltb/N; 02070 if (s < vadjust) { 02071 float rt = sqrt(1.f - pow(s/vadjust, 2)); 02072 i0table[i] = sqrt(facadj*rt)*static_cast<float>(gsl_sf_bessel_I1(facadj*rt))/val0; 02073 } else { 02074 i0table[i] = 0.f; 02075 } 02076 } 02077 }
float Util::FakeKaiserBessel::i0win | ( | float | x | ) | const [virtual] |
Kaiser-Bessel I0 window function.
Reimplemented from EMAN::Util::KaiserBessel.
Definition at line 2053 of file util_sparx.cpp.
References EMAN::Util::KaiserBessel::facadj, sqrt(), and EMAN::Util::KaiserBessel::vadjust.
02053 { 02054 float val0 = sqrt(facadj)*float(gsl_sf_bessel_I1(facadj)); 02055 float absx = fabs(x); 02056 if (absx > vadjust) return 0.f; 02057 float rt = sqrt(1.f - pow(absx/vadjust, 2)); 02058 float res = sqrt(facadj*rt)*float(gsl_sf_bessel_I1(facadj*rt))/val0; 02059 return res; 02060 }
float Util::FakeKaiserBessel::sinhwin | ( | float | x | ) | const [virtual] |
Kaiser-Bessel Sinh window function.
Reimplemented from EMAN::Util::KaiserBessel.
Definition at line 2079 of file util_sparx.cpp.
References EMAN::Util::KaiserBessel::alphar, EMAN::Util::KaiserBessel::fac, and sqrt().
02079 { 02080 float val0 = sinh(fac)/fac; 02081 float absx = fabs(x); 02082 if (0.0 == x) { 02083 float res = 1.0f; 02084 return res; 02085 } else if (absx == alphar) { 02086 return 1.0f/val0; 02087 } else if (absx < alphar) { 02088 float rt = sqrt(1.0f - pow((x/alphar), 2)); 02089 float facrt = fac*rt; 02090 float res = (sinh(facrt)/facrt)/val0; 02091 return res; 02092 } else { 02093 float rt = sqrt(pow((x/alphar),2) - 1.f); 02094 float facrt = fac*rt; 02095 float res = (sin(facrt)/facrt)/val0; 02096 return res; 02097 } 02098 }