Class to compute sliding median. More...
#include <MedianSlider.h>
Public Member Functions | |
MedianSlider () | |
MedianSlider (int halfwin) | |
MedianSlider (const MedianSlider &other) | |
~MedianSlider () | |
MedianSlider & | operator= (const MedianSlider &other) |
void | cleanup () |
Float | add (Float d, Bool flag=False) |
Adds a datum to the slider. | |
Float | add () |
Adds a flagged datum. | |
Float | next (uInt n=1) |
Adds N flagged datums. | |
Float | add (const Vector< Float > &d, const Vector< Bool > &flag) |
Adds several datums at once (with corresponding flags). | |
Float | add (const Vector< Float > &d) |
Adds several non-flagged datums at once. | |
Int | nval () |
Returns the number of values currently in the window. | |
Float | median () |
Returns the current median value. | |
Float | prevVal (uInt n, Bool &flag) |
Returns a previous value (from n steps ago) from the sliding window. | |
Float | midpoint (Bool &flag) |
Returns value from midpoint (center) of window, possibly with flag. | |
Float | midpoint () |
Float | diff (Bool &flag) |
Returns the difference between the current median and the value at window center. | |
Float | diff () |
Bool | assure () |
For testing purposes only: verifies current value of median. | |
Static Public Member Functions | |
static size_t | objsize (int halfwin) |
returns total memory usage (in bytes) for a given halfwin size | |
Private Attributes | |
uInt | halfwin |
uInt | fullwin |
Float * | buf |
uInt * | index |
Bool * | valid |
uInt | ibuf |
uInt | nind |
Class to compute sliding median.
Public interface
MedianSlider is a class for efficient computing of sliding medians.
Flagging Agents make extended use of sliding medians.
Definition at line 64 of file MedianSlider.h.
casacore::MedianSlider::MedianSlider | ( | ) |
casacore::MedianSlider::MedianSlider | ( | int | halfwin | ) |
casacore::MedianSlider::MedianSlider | ( | const MedianSlider & | other | ) |
casacore::MedianSlider::~MedianSlider | ( | ) |
Adds several non-flagged datums at once.
Adds several datums at once (with corresponding flags).
Float casacore::MedianSlider::add | ( | ) | [inline] |
Adds a flagged datum.
Definition at line 82 of file MedianSlider.h.
References add(), and casacore::True.
Referenced by add().
Adds a datum to the slider.
Once the window is full, newer values will push out older values. Returns the new median value. If flag is set to true, adds a "flagged" datum, one which takes up space in the window but is skipped during median computations.
Bool casacore::MedianSlider::assure | ( | ) |
For testing purposes only: verifies current value of median.
Throws an exception if it fails.
void casacore::MedianSlider::cleanup | ( | ) |
Float casacore::MedianSlider::diff | ( | ) | [inline] |
Returns the difference between the current median and the value at window center.
Optionally, also returns flag of median center
Definition at line 110 of file MedianSlider.h.
References median(), and midpoint().
Float casacore::MedianSlider::median | ( | ) | [inline] |
Float casacore::MedianSlider::midpoint | ( | ) | [inline] |
Definition at line 105 of file MedianSlider.h.
References midpoint().
Referenced by diff(), and midpoint().
Returns value from midpoint (center) of window, possibly with flag.
Definition at line 148 of file MedianSlider.h.
Int casacore::MedianSlider::nval | ( | ) | [inline] |
Returns the number of values currently in the window.
This is less than the window width initially. Int size ();
Returns the number of non-flagged values in window
Definition at line 133 of file MedianSlider.h.
References nind.
static size_t casacore::MedianSlider::objsize | ( | int | halfwin | ) | [inline, static] |
returns total memory usage (in bytes) for a given halfwin size
Definition at line 115 of file MedianSlider.h.
MedianSlider& casacore::MedianSlider::operator= | ( | const MedianSlider & | other | ) |
Returns a previous value (from n steps ago) from the sliding window.
Referenced by midpoint().
Float* casacore::MedianSlider::buf [private] |
Definition at line 125 of file MedianSlider.h.
Referenced by median().
uInt casacore::MedianSlider::fullwin [private] |
Definition at line 124 of file MedianSlider.h.
uInt casacore::MedianSlider::halfwin [private] |
Definition at line 124 of file MedianSlider.h.
Referenced by midpoint().
uInt casacore::MedianSlider::ibuf [private] |
Definition at line 128 of file MedianSlider.h.
uInt* casacore::MedianSlider::index [private] |
Definition at line 126 of file MedianSlider.h.
Referenced by median().
uInt casacore::MedianSlider::nind [private] |
Definition at line 128 of file MedianSlider.h.
Bool* casacore::MedianSlider::valid [private] |
Definition at line 127 of file MedianSlider.h.