Computes in polar coordinates. More...

#include <Analysis.h>

Inheritance diagram for PolarSegmentProber:

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Collaboration diagram for PolarSegmentProber:

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Public Member Functions
	PolarSegmentProber (const drain::image::Channel &src, drain::image::Channel &dst)

virtual void	update (int i, int j)
	Operation performed in each segment location (i,j). A function to be redefined in derived classes.

Public Member Functions inherited from SizeProber
	SizeProber (const Channel &s, Channel &d)

virtual void	clear ()
	Called before processing each segment. Compare with init(), which is called once for each image.

virtual void	visit (int i, int j)
	Visiting a single pixel when not coming from any direction.

virtual bool	isVisited (int i, int j) const
	Experimental.

virtual bool	isValidSegment (int i, int j) const
	Application dependent, to be redefined. Assumes checked coordinates.

Public Member Functions inherited from SegmentProber< int, int, SegmentProberConf< int, int > >
	SegmentProber (const Channel &s)

	SegmentProber (const Channel &s, Channel &d)

void	setDst (Channel &d)
	Set new target channel. Needed in multichannel operations.

virtual void	init ()
	Fills the segment having intensity between min and max.

void	scan ()
	A convenience function for traversing a whole image.

void	probe (int i, int j, bool HORIZONTAL)
	Start probings.

bool	isValidPixel (int i, int j) const
	Returns isValidSegment(i,j) and !isVisited(i,j).

Additional Inherited Members
Public Types inherited from SegmentProber< int, int, SegmentProberConf< int, int > >
typedef int	src_t

typedef int	dst_t

typedef SegmentProberConf< int, int >	conf_t

Public Attributes inherited from SizeProber
size_t	size

Public Attributes inherited from SegmentProber< int, int, SegmentProberConf< int, int > >
ProberControl &	control

conf_t	conf

const Channel &	src

Channel *	dst

Protected Member Functions inherited from SegmentProber< int, int, SegmentProberConf< int, int > >
virtual bool	isValidMove (int i0, int j0, int i, int j) const
	Application dependent, to be redefined. Note: assumes checked coordinates.

bool	move (int &i, int &j)
	Try to move; change coords in success, else keep them intact.

void	scanHorzProbeVert (int i, int j)
	A semi-recursive approach that turns the 2D recursion to 1D traversal + 1D recursion.

void	scanVertProbeHorz (int i, int j)

Protected Attributes inherited from SegmentProber< int, int, SegmentProberConf< int, int > >
SimpleProberControl	basicControl

Detailed Description

Computes in polar coordinates.

The area of a sector of a circle is

$A_s = \frac{1}{2}ra = \frac{1}{2}\alpha r^2$

where is radius and $p = \alpha r$ arc of the sector.

Consider a radar sweep and a bin where is the range index and is the azimuthal index. The corresponding physical area is

$A_b(i,j) = \frac{1}{2}(r_2-r_1)a = \frac{1}{2}\mathrm{rscale}\cdot \frac{2\pi}{\mathrm{nrays}}(i\cdot \mathrm{rscale}) = \frac{\pi(\mathrm{rscale})^2}{\mathrm{nrays}} i$

where $\mathrm{rscale}$ is the phycal bin length and $\mathrm{nrays}$ the number of beams in the sweep. Notice that the area is a function of only, but we write both indices for clarity.

Consider a segment $\Phi$ in a radar sweep. The segment can be identified with the set of coordinate of the involved bins: $\Phi = \{(i,j)\}$ In computing the area of segment $\Phi$ , PolarSegmentProber primarily computes a simple integer quantity

$D_\Phi = \sum_\Phi i$

The physical area is hence

$A_\Phi = \sum_\Phi A_b(i,j) = \sum_\Phi \frac{\pi(\mathrm{rscale})^2}{\mathrm{nrays}} i = \frac{\pi(\mathrm{rscale})^2}{\mathrm{nrays}} \sum_\Phi i = \frac{\pi(\mathrm{rscale})^2}{\mathrm{nrays}} D_\Phi$

Member Function Documentation

◆ update()

virtual void update	(	int	i,
		int	j
	)

inlinevirtual

Operation performed in each segment location (i,j). A function to be redefined in derived classes.

Reimplemented from SizeProber.

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

src/radar/Analysis.h

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ update()