#include <util_sparx.h>
Inheritance diagram for KaiserBessel:
Public Member Functions | |
KaiserBessel (float alpha_, int K, float r_, float v_, int N_, float vtable_=0.f, int ntable_=5999) | |
virtual | ~KaiserBessel () |
float | I0table_maxerror () |
Compute the maximum error in the table. | |
vector< float > | dump_table () |
virtual float | sinhwin (float x) const |
Kaiser-Bessel Sinh window function. | |
virtual float | i0win (float x) const |
Kaiser-Bessel I0 window function. | |
float | i0win_tab (float x) const |
Kaiser-Bessel I0 window function (uses table lookup). | |
int | get_window_size () const |
Return the size of the I0 window. | |
kbsinh_win | get_kbsinh_win () |
Sinh window function object factory. | |
kbi0_win | get_kbi0_win () |
I0 window function object factory. | |
Protected Member Functions | |
virtual void | build_I0table () |
2*pi*alpha*r*vadjust | |
Protected Attributes | |
float | alpha |
float | v |
float | r |
int | N |
Kaiser-Bessel parameters. | |
int | K |
size in Ix-space | |
float | vtable |
I0 window size. | |
int | ntable |
table I0 non-zero domain maximum | |
vector< float > | i0table |
float | dtable |
float | alphar |
table spacing | |
float | fac |
alpha*r | |
float | vadjust |
2*pi*alpha*r*v | |
float | facadj |
float | fltb |
Tabulate I0 window for speed. | |
Classes | |
class | kbi0_win |
I0 window function object. More... | |
class | kbsinh_win |
Sinh window function object. More... |
(It's a class so that the windowing parameters may be instantiated and held in the instance object.)
The I0 version can be tabulated and interpolated upon demand, but the max error needs to be checked. The "vtable" parameter corresponds to the maximum value of x for which the I0 window is non-zero. Setting "vtable" different from "v" corresponds to a change in units of x. In practice, it is often handy to replace x in some sort of absolute units with x described in terms of grid intervals.
The get_kbsinh_win and get_kbi0_win functions return single-argument function objects, which is what a generic routine is likely to want.
Definition at line 224 of file util_sparx.h.
KaiserBessel::KaiserBessel | ( | float | alpha_, | |
int | K, | |||
float | r_, | |||
float | v_, | |||
int | N_, | |||
float | vtable_ = 0.f , |
|||
int | ntable_ = 5999 | |||
) |
virtual KaiserBessel::~KaiserBessel | ( | ) | [inline, virtual] |
virtual void KaiserBessel::build_I0table | ( | ) | [protected, virtual] |
vector<float> KaiserBessel::dump_table | ( | ) | [inline] |
Definition at line 247 of file util_sparx.h.
References i0table.
00247 { 00248 return i0table; 00249 }
kbi0_win KaiserBessel::get_kbi0_win | ( | ) | [inline] |
kbsinh_win KaiserBessel::get_kbsinh_win | ( | ) | [inline] |
int KaiserBessel::get_window_size | ( | ) | const [inline] |
Return the size of the I0 window.
Definition at line 268 of file util_sparx.h.
References K.
Referenced by KaiserBessel::kbi0_win::get_window_size(), and KaiserBessel::kbsinh_win::get_window_size().
00268 { return K; }
float KaiserBessel::I0table_maxerror | ( | ) |
Compute the maximum error in the table.
virtual float KaiserBessel::i0win | ( | float | x | ) | const [virtual] |
Kaiser-Bessel I0 window function.
Reimplemented in FakeKaiserBessel.
Referenced by KaiserBessel::kbi0_win::operator()().
float KaiserBessel::i0win_tab | ( | float | x | ) | const [inline] |
Kaiser-Bessel I0 window function (uses table lookup).
Definition at line 255 of file util_sparx.h.
00255 { 00256 /*float absx = fabs(x); 00257 int loc = int(round(absx*fltb)); 00258 return i0table[loc];*/ 00259 float xt; 00260 if(x<0.f) xt = -x*fltb+0.5f; else xt = x*fltb+0.5f; 00261 return i0table[ (int) xt]; 00262 /*return i0table[ (int) (fabs(x)*fltb+0.5f)]; 00263 if (absx > vtable) return 0.f; 00264 float loc = absx/dtable; 00265 return i0table[int(loc + 0.5f)]; */ 00266 }
virtual float KaiserBessel::sinhwin | ( | float | x | ) | const [virtual] |
Kaiser-Bessel Sinh window function.
Reimplemented in FakeKaiserBessel.
Referenced by KaiserBessel::kbsinh_win::operator()().
float KaiserBessel::alpha [protected] |
Definition at line 227 of file util_sparx.h.
float KaiserBessel::alphar [protected] |
float KaiserBessel::dtable [protected] |
Definition at line 233 of file util_sparx.h.
float KaiserBessel::fac [protected] |
float KaiserBessel::facadj [protected] |
Definition at line 237 of file util_sparx.h.
float KaiserBessel::fltb [protected] |
Tabulate I0 window for speed.
Definition at line 239 of file util_sparx.h.
Referenced by i0win_tab().
vector<float> KaiserBessel::i0table [protected] |
int KaiserBessel::K [protected] |
int KaiserBessel::N [protected] |
int KaiserBessel::ntable [protected] |
float KaiserBessel::r [protected] |
Definition at line 227 of file util_sparx.h.
float KaiserBessel::v [protected] |
Definition at line 227 of file util_sparx.h.
float KaiserBessel::vadjust [protected] |
float KaiserBessel::vtable [protected] |