#include <mrpt/otherlibs/do_opencv_includes.h>
#include <stdio.h>

Include dependency graph for vision/src/sift-hess/utils.h:

Macros
#define	ABS(x) ( ( x < 0 )? -x : x )

Functions
static __inline int	pixval8 (IplImage *img, int r, int c)
	A function to get a pixel value from an 8-bit unsigned image. More...

static __inline void	setpix8 (IplImage *img, int r, int c, uchar val)
	A function to set a pixel value in an 8-bit unsigned image. More...

static __inline float	pixval32f (IplImage *img, int r, int c)
	A function to get a pixel value from a 32-bit floating-point image. More...

static __inline void	setpix32f (IplImage *img, int r, int c, float val)
	A function to set a pixel value in a 32-bit floating-point image. More...

static __inline double	pixval64f (IplImage *img, int r, int c)
	A function to get a pixel value from a 64-bit floating-point image. More...

static __inline void	setpix64f (IplImage *img, int r, int c, double val)
	A function to set a pixel value in a 64-bit floating-point image. More...

void	fatal_error (char *format,...)
	Prints an error message and aborts the program. More...

char *	replace_extension (const char file, const char extn)
	Replaces a file's extension, which is assumed to be everything after the last dot ('. More...

void	progress (int done)
	A function that removes the path from a filename. More...

void	erase_from_stream (FILE *stream, int n)
	Erases a specified number of characters from a stream. More...

int	array_double (void **array, int n, int size)
	Doubles the size of an array with error checking More...

double	dist_sq_2D (CvPoint2D64f p1, CvPoint2D64f p2)
	Calculates the squared distance between two points. More...

void	draw_x (IplImage *img, CvPoint pt, int r, int w, CvScalar color)
	Draws an x on an image. More...

IplImage *	stack_imgs (IplImage img1, IplImage img2)
	Combines two images by scacking one on top of the other More...

void	vid_view (IplImage *imgs, int n, char win_name)
	Allows user to view an array of images as a video. More...

int	win_closed (char *name)
	Checks if a HighGUI window is still open or not More...

Macro Definition Documentation

◆ ABS

#define ABS ( x ) ( ( x < 0 )? -x : x )

Definition at line 26 of file vision/src/sift-hess/utils.h.

Function Documentation

◆ array_double()

int array_double	(	void **	array,
		int	n,
		int	size
	)

Doubles the size of an array with error checking

Parameters

array	pointer to an array whose size is to be doubled
n	number of elements allocated for array
size	size in bytes of elements in array

Returns: Returns the new number of elements allocated for array. If no memory is available, returns 0 and frees array.

◆ dist_sq_2D()

double dist_sq_2D	(	CvPoint2D64f	p1,
		CvPoint2D64f	p2
	)

Calculates the squared distance between two points.

Parameters

p1	a point
p2	another point

◆ draw_x()

void draw_x	(	IplImage *	img,
		CvPoint	pt,
		int	r,
		int	w,
		CvScalar	color
	)

Draws an x on an image.

Parameters

img	an image
pt	the center point of the x
r	the x's radius
w	the x's line weight
color	the color of the x

◆ erase_from_stream()

void erase_from_stream	(	FILE *	stream,
		int	n
	)

Erases a specified number of characters from a stream.

Parameters

stream	the stream from which to erase characters
n	the number of characters to erase

◆ fatal_error()

void fatal_error	(	char *	format,
			...
	)

Prints an error message and aborts the program.

The error message is of the form "Error: ...", where the ... is specified by the format argument

Parameters

format an error message format string (as with printf(3)).

◆ pixval32f()

static __inline float pixval32f	(	IplImage *	img,
		int	r,
		int	c
	)

static

A function to get a pixel value from a 32-bit floating-point image.

Parameters

img	an image
r	row
c	column

Returns: Returns the value of the pixel at (r, c) in img

Definition at line 69 of file vision/src/sift-hess/utils.h.

Referenced by mrpt::vision::CFeatureExtraction::getLaplacianValue(), and mrpt::vision::CFeatureExtraction::getTimesExtrema().

◆ pixval64f()

static __inline double pixval64f	(	IplImage *	img,
		int	r,
		int	c
	)

static

A function to get a pixel value from a 64-bit floating-point image.

Parameters

img	an image
r	row
c	column

Returns: Returns the value of the pixel at (r, c) in img

Definition at line 97 of file vision/src/sift-hess/utils.h.

◆ pixval8()

static __inline int pixval8	(	IplImage *	img,
		int	r,
		int	c
	)

static

A function to get a pixel value from an 8-bit unsigned image.

Parameters

img	an image
r	row
c	column

Returns: Returns the value of the pixel at (r, c) in img

Definition at line 41 of file vision/src/sift-hess/utils.h.

◆ progress()

void progress ( int done )

A function that removes the path from a filename.

Similar to the Unix basename command.

Parameters

pathname a (full) path name

Returns: Returns the basename of pathname.
Displays progress in the console with a spinning pinwheel. Every time this function is called, the state of the pinwheel is incremented. The pinwheel has four states that loop indefinitely: '|', '/', '-', '\'.

Parameters

done	if 0, this function simply increments the state of the pinwheel; otherwise it prints "done"

◆ replace_extension()

char* replace_extension	(	const char *	file,
		const char *	extn
	)

Replaces a file's extension, which is assumed to be everything after the last dot ('.

') character.

Parameters

file	the name of a file
extn	a new extension for file; should not include a dot (i.e. `"jpg"`, not `".jpg"`) unless the new file extension should contain two dots.

Returns: Returns a new string formed as described above. If file does not have an extension, this function simply adds one.

◆ setpix32f()

static __inline void setpix32f	(	IplImage *	img,
		int	r,
		int	c,
		float	val
	)

static

A function to set a pixel value in a 32-bit floating-point image.

Parameters

img	an image
r	row
c	column
val	pixel value

Definition at line 83 of file vision/src/sift-hess/utils.h.

References val.

◆ setpix64f()

static __inline void setpix64f	(	IplImage *	img,
		int	r,
		int	c,
		double	val
	)

static

A function to set a pixel value in a 64-bit floating-point image.

Parameters

img	an image
r	row
c	column
val	pixel value

Definition at line 111 of file vision/src/sift-hess/utils.h.

References val.

◆ setpix8()

static __inline void setpix8	(	IplImage *	img,
		int	r,
		int	c,
		uchar	val
	)

static

A function to set a pixel value in an 8-bit unsigned image.

Parameters

img	an image
r	row
c	column
val	pixel value

Definition at line 55 of file vision/src/sift-hess/utils.h.

References val.

◆ stack_imgs()

IplImage* stack_imgs	(	IplImage *	img1,
		IplImage *	img2
	)

Combines two images by scacking one on top of the other

Parameters

img1	top image
img2	bottom image

Returns: Returns the image resulting from stacking img1 on top if img2

◆ vid_view()

void vid_view	(	IplImage **	imgs,
		int	n,
		char *	win_name
	)

Allows user to view an array of images as a video.

Keyboard controls are as follows:

Space - start and pause playback
Page Up - skip forward 10 frames
Page Down - jump back 10 frames
Right Arrow - skip forward 1 frame
Left Arrow - jump back 1 frame
Backspace - jump back to beginning
Esc - exit playback
Closing the window also exits playback

Parameters

imgs	an array of images
n	number of images in imgs
win_name	name of window in which images are displayed

◆ win_closed()

int win_closed ( char * name )

Checks if a HighGUI window is still open or not

Parameters

name	the name of the window we're checking

Returns: Returns 1 if the window named name has been closed or 0 otherwise

Macros

Functions

Macro Definition Documentation

◆ ABS

Function Documentation

◆ array_double()

◆ dist_sq_2D()

◆ draw_x()

◆ erase_from_stream()

◆ fatal_error()

◆ pixval32f()

◆ pixval64f()

◆ pixval8()

◆ progress()

◆ replace_extension()

◆ setpix32f()

◆ setpix64f()

◆ setpix8()

◆ stack_imgs()

◆ vid_view()

◆ win_closed()