GClasses::GImageJitterer Class Reference

Given an image encoded as a rasterized row of channel values, this class computes a single pixel drawn from the image as if the image had been rotated, translated, and zoomed by a small random amount. (The purpose of this class is to make it possible to train GUnsupervisedBackProp to understand these common image-based transformations.) More...

#include <GManifold.h>

Public Member Functions
	GImageJitterer (size_t wid, size_t hgt, size_t channels, double rotateDegrees, double translateWidths, double zoomFactor)
	if rotateDegrees is 30.0, then it will rotate the image up to 15.0 degrees in either direction. if translateWidths is 1.0, then it will translate between -0.5*wid and 0.5*wid. It will also translate vertically by a value in the same range (dependant on wid, not hgt). if zoomFactor is 2.0, then it will scale between a factor of 0.5 and 2.0. More...
	GImageJitterer (GDomNode *pNode)
	Deserializing constructor. More...
size_t	channels ()
	Returns the number of channels. More...
size_t	hgt ()
	Returns the height of the images. More...
double *	pickParams (GRand &rand)
	Sets the 4 params to random uniform values between 0 and 1, and returns the params. More...
GDomNode *	serialize (GDom *pDoc) const
	Marshall this object into a DOM that can be serialized. More...
void	transformedPix (const double *pRow, size_t x, size_t y, double *pOut)
	Returns the specified pixel in the transformed image. More...
size_t	wid ()
	Returns the width of the images. More...

Static Public Member Functions
static void	test (const char *filename)

Protected Member Functions
void	interpolate (const double *pRow, double x, double y, double *pOut)

Detailed Description

Given an image encoded as a rasterized row of channel values, this class computes a single pixel drawn from the image as if the image had been rotated, translated, and zoomed by a small random amount. (The purpose of this class is to make it possible to train GUnsupervisedBackProp to understand these common image-based transformations.)

Constructor & Destructor Documentation

GClasses::GImageJitterer::GImageJitterer	(	size_t	wid,
		size_t	hgt,
		size_t	channels,
		double	rotateDegrees,
		double	translateWidths,
		double	zoomFactor
	)

if rotateDegrees is 30.0, then it will rotate the image up to 15.0 degrees in either direction. if translateWidths is 1.0, then it will translate between -0.5*wid and 0.5*wid. It will also translate vertically by a value in the same range (dependant on wid, not hgt). if zoomFactor is 2.0, then it will scale between a factor of 0.5 and 2.0.

GClasses::GImageJitterer::GImageJitterer

(

GDomNode *

pNode

)

Deserializing constructor.

Member Function Documentation

size_t GClasses::GImageJitterer::channels ( )

inline

Returns the number of channels.

size_t GClasses::GImageJitterer::hgt ( )

inline

Returns the height of the images.

void GClasses::GImageJitterer::interpolate ( const double *  pRow, double  x, double  y, double *  pOut  )

protected

double* GClasses::GImageJitterer::pickParams

(

GRand &

rand

)

Sets the 4 params to random uniform values between 0 and 1, and returns the params.

GDomNode* GClasses::GImageJitterer::serialize

(

GDom *

pDoc

)

const

Marshall this object into a DOM that can be serialized.

static void GClasses::GImageJitterer::test ( const char *  filename )

static

void GClasses::GImageJitterer::transformedPix	(	const double *	pRow,
		size_t	x,
		size_t	y,
		double *	pOut
	)

Returns the specified pixel in the transformed image.

size_t GClasses::GImageJitterer::wid ( )

inline

Returns the width of the images.