#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 |
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Definition at line 382 of file util.h. 00439 {
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2*pi*alpha*r*vadjust
Reimplemented from EMAN::Util::KaiserBessel. Definition at line 2061 of file util_sparx.cpp. References EMAN::Util::round(), and sqrt(). 02061 { 02062 i0table.resize(ntable+1); // i0table[0:ntable] 02063 int ltab = int(round(float(ntable)/1.1f)); 02064 fltb = float(ltab)/(K/2); 02065 float val0 = sqrt(facadj)*static_cast<float>(gsl_sf_bessel_I1(facadj)); 02066 for (int i=ltab+1; i <= ntable; i++) i0table[i] = 0.f; 02067 for (int i=0; i <= ltab; i++) { 02068 float s = float(i)/fltb/N; 02069 if (s < vadjust) { 02070 float rt = sqrt(1.f - pow(s/vadjust, 2)); 02071 i0table[i] = sqrt(facadj*rt)*static_cast<float>(gsl_sf_bessel_I1(facadj*rt))/val0; 02072 } else { 02073 i0table[i] = 0.f; 02074 } 02075 } 02076 }
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Kaiser-Bessel I0 window function.
Reimplemented from EMAN::Util::KaiserBessel. Definition at line 2052 of file util_sparx.cpp. 02052 { 02053 float val0 = sqrt(facadj)*float(gsl_sf_bessel_I1(facadj)); 02054 float absx = fabs(x); 02055 if (absx > vadjust) return 0.f; 02056 float rt = sqrt(1.f - pow(absx/vadjust, 2)); 02057 float res = sqrt(facadj*rt)*float(gsl_sf_bessel_I1(facadj*rt))/val0; 02058 return res; 02059 }
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Kaiser-Bessel Sinh window function.
Reimplemented from EMAN::Util::KaiserBessel. Definition at line 2078 of file util_sparx.cpp. 02078 { 02079 float val0 = sinh(fac)/fac; 02080 float absx = fabs(x); 02081 if (0.0 == x) { 02082 float res = 1.0f; 02083 return res; 02084 } else if (absx == alphar) { 02085 return 1.0f/val0; 02086 } else if (absx < alphar) { 02087 float rt = sqrt(1.0f - pow((x/alphar), 2)); 02088 float facrt = fac*rt; 02089 float res = (sinh(facrt)/facrt)/val0; 02090 return res; 02091 } else { 02092 float rt = sqrt(pow((x/alphar),2) - 1.f); 02093 float facrt = fac*rt; 02094 float res = (sin(facrt)/facrt)/val0; 02095 return res; 02096 } 02097 }
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