Operations on Images

Write a moved version of each image (a column in src) to dst. More...

Files
file	image_pyramid.hpp
	classes/methods dealing with the construction of image pyramids

Classes
class	cuv::image_pyramid< __matrix_type >
	image pyramid decreasing in size logarithmically. More...

Functions
template<class T , class S , class I >
void	cuv::gaussian_pyramid_downsample (tensor< T, S, row_major > &dst, const cuda_array< T, S, I > &src, const unsigned int interleaved_channels)
	sample down an image by a factor of 2
template<class T , class S , class I >
void	cuv::gaussian_pyramid_upsample (tensor< T, S, row_major > &dst, const cuda_array< T, S, I > &src)
template<class TDest , class T , class S , class I >
void	cuv::get_pixel_classes (tensor< TDest, S, row_major > &dst, const cuda_array< T, S, I > &src, float scale_fact)
template<class T , class S , class I >
void	cuv::gaussian (tensor< T, S, row_major > &dst, const cuda_array< T, S, I > &src)
matrix_type *	cuv::image_pyramid< __matrix_type >::get (int depth, int channel)
	Get a view on a channel in the pyramid.
matrix_type *	cuv::image_pyramid< __matrix_type >::get_all_channels (int depth)
	cuv::image_pyramid< __matrix_type >::image_pyramid (int img_h, int img_w, int depth, int dim)
	construct an image pyramid.

Detailed Description

Write a moved version of each image (a column in src) to dst.

Assumptions:

• (n*num_maps by m) matrix, where n=image_width*image_height is an image
• images are in RGBA interleaved format(num_maps=4), A channel is ignored.
• images can also be in grayscale (num_maps=1).

Todo:

previously non-existent pixels at the border are filled... how?

Function Documentation

template<class T , class S , class I >

void cuv::gaussian_pyramid_downsample	(	tensor< T, S, row_major > &	dst,
		const cuda_array< T, S, I > &	src,
		const unsigned int	interleaved_channels
	)

sample down an image by a factor of 2

Parameters

dst	target matrix; when interleaved_channels is 4, this should be a matrix which is 3 times as high as src
src	source matrix; when interleaved_channels is 4, this should have dim=4 set
interleaved_channels	can be 1 (grayscale) or 4 (RGBA)

template<class __matrix_type >

image_pyramid< __matrix_type >::matrix_type * cuv::image_pyramid< __matrix_type >::get	(	int	depth,
		int	channel
	)

Get a view on a channel in the pyramid.

Parameters

depth	level of the pyramid
channel	channel (red, for example)

Definition at line 153 of file image_pyramid.hpp.

template<class __matrix_type >

cuv::image_pyramid< __matrix_type >::image_pyramid	(	int	img_h,
		int	img_w,
		int	depth,
		int	dim
	)

construct an image pyramid.

Parameters

img_h	height of one image at base
img_w	width of one image at base
depth	depth of the pyramid (0..depth-1)
dim	the pixel dimension (can be 1 or 3)

Definition at line 172 of file image_pyramid.hpp.