Image Utilities

Useful functions for working with images

Classes
class	mx::improc::sourceFinder< _realT >
	Find stars in an image by SNR thresholding. More...

Functions
template<typename realT >
int	mx::improc::circleOuterpix (realT &x0, realT &y0, realT &avgr0, realT &avgx, realT &avgy, realT &avgr, eigenImage< realT > &circ, const eigenImage< realT > &masked)
	Find the center and the outermost pixels of a circular mask, giving an estimate of the radius.

Function Documentation

circleOuterpix()

template<typename realT >

int mx::improc::circleOuterpix	(	realT &	x0,
		realT &	y0,
		realT &	avgr0,
		realT &	avgx,
		realT &	avgy,
		realT &	avgr,
		eigenImage< realT > &	circ,
		const eigenImage< realT > &	masked
	)

Find the center and the outermost pixels of a circular mask, giving an estimate of the radius.

Takes a 1/0 mask of a filled circle or annulus, and calculates the center coordinate by center-of-light, then finds the outermost 1 pixel in each row and column. Calculates the average radius of these pixels w.r.t. to the c.o.l. coords, as well as w.r.t. the average coords of the outer pixels themselves.

Also produces an image containing the outer pixels.

Returns

0 on success

Template Parameters

realT

the real floating-point type for calculations

Parameters

y0	< [out] x coord of center of the mask by center-of-light
avgr0	< [out] y coord of center of the mask by center-of-light
avgx	< [out] average radius of edge pixels w.r.t. center-of-light
avgy	< [out] x coord of center of the mask by average edge pixel
avgr	< [out] y coord of center of the mask by average edge pixel
circ	< [out] average radius of edge pixels w.r.t. to average edge pixel
masked	< [out] image showing the edge pixels with value 1, all other pixels 0. Resized. < [in] an image with a (roughly) circular mask of 1s

Definition at line 55 of file circleOuterpix.hpp.

References mx::improc::imageCenterOfLight().

imcpy()

void * mx::improc::imcpy	(	void *	dest,
		void *	src,
		size_t	width,
		size_t	height,
		size_t	szof
	)

Copy one image to another, with no transformation.

This is merely memcpy

Returns

dest

Parameters

[out]	dest	the address of the first pixel in the destination image
[in]	src	the address of the first pixel in the source image
[in]	width	the width in pixels of size szof
[in]	height	the height in pixels of size szof
[in]	szof	the size in bytes of a one pixel

Definition at line 35 of file imageUtils.cpp.

imcpy_flipLR()

void * mx::improc::imcpy_flipLR	(	void *	dest,
		void *	src,
		size_t	width,
		size_t	height,
		size_t	szof
	)

Copy one image to another, flipping left-right.

Returns

dest

Parameters

[out]	dest	the address of the first pixel in the destination image
[in]	src	the address of the first pixel in the source image
[in]	width	the width in pixels of size szof
[in]	height	the height in pixels of size szof
[in]	szof	the size in bytes of a one pixel

Definition at line 50 of file imageUtils.cpp.

imcpy_flipUD()

void * mx::improc::imcpy_flipUD	(	void *	dest,
		void *	src,
		size_t	width,
		size_t	height,
		size_t	szof
	)

Copy one image to another, flipping up-down.

This is a reversed row-by-row memcpy

Returns

dest

Parameters

[out]	dest	the address of the first pixel in the destination image
[in]	src	the address of the first pixel in the source image
[in]	width	the width in pixels of size szof
[in]	height	the height in pixels of size szof
[in]	szof	the size in bytes of a one pixel

Definition at line 40 of file imageUtils.cpp.

imcpy_flipUDLR()

void * mx::improc::imcpy_flipUDLR	(	void *	dest,
		void *	src,
		size_t	width,
		size_t	height,
		size_t	szof
	)

Copy one image to another, flipping up-down and left-right.

Returns

dest

Parameters

[out]	dest	the address of the first pixel in the destination image
[in]	src	the address of the first pixel in the source image
[in]	width	the width in pixels of size szof
[in]	height	the height in pixels of size szof
[in]	szof	the size in bytes of a one pixel

Definition at line 118 of file imageUtils.cpp.

IsNan()

bool mx::improc::IsNan ( float  value )

inline

Check if the number is nan, using several different methods.

Definition at line 83 of file imageUtils.hpp.

Referenced by mx::improc::zeroNaNCube(), and mx::improc::zeroNaNs().

reflectImageCoords()

template<typename realT >

int mx::improc::reflectImageCoords	(	int &	x1,
		int &	y1,
		int	x0,
		int	y0,
		realT	xc,
		realT	yc
	)

Reflect pixel coordinates across the given center pixel.

Parameters

[out]	x1	the reflected x coordinate
[out]	y1	the reflected y coordinate
[in]	x0	the input x coordinate
[in]	y0	the input y coordinate
[in]	xc	the center pixel x coordinate
[in]	yc	the center pixel y coordinate

Definition at line 93 of file imageUtils.hpp.

Referenced by mx::improc::reflectImageIndices().