Columns Statistic

Estimation of image statistic for separate columns. More...

Functions
SIMD_API void	SimdGetColSums (const uint8_t *src, size_t stride, size_t width, size_t height, uint32_t *sums)
	Calculate sums of columns for given 8-bit gray image. More...
SIMD_API void	SimdGetAbsDxColSums (const uint8_t *src, size_t stride, size_t width, size_t height, uint32_t *sums)
	Calculate sums of absolute derivate along x axis for columns for given 8-bit gray image. More...
template<template< class > class A>
SIMD_INLINE void	GetColSums (const View< A > &src, uint32_t *sums)
	Calculate sums of columns for given 8-bit gray image. More...
template<template< class > class A>
SIMD_INLINE void	GetAbsDxColSums (const View< A > &src, uint32_t *sums)
	Calculate sums of absolute derivate along x axis for columns for given 8-bit gray image. More...

Detailed Description

Estimation of image statistic for separate columns.

Function Documentation

SimdGetColSums()

void SimdGetColSums	(	const uint8_t *	src,
		size_t	stride,
		size_t	width,
		size_t	height,
		uint32_t *	sums
	)

Calculate sums of columns for given 8-bit gray image.

For all columns:

for(y = 0; y < height; ++y)
    sums[x] += src[x, y];

Note

This function has a C++ wrappers: Simd::GetColSums(const View<A>& src, uint32_t * sums).

Parameters

[in]	src	- a pointer to pixels data of the input image.
[in]	stride	- a row size of the input image.
[in]	width	- an image width.
[in]	height	- an image height.
[out]	sums	- a pointer to array of unsigned 32-bit integers result sums of columns. It length must be equal to image width.

SimdGetAbsDxColSums()

void SimdGetAbsDxColSums	(	const uint8_t *	src,
		size_t	stride,
		size_t	width,
		size_t	height,
		uint32_t *	sums
	)

Calculate sums of absolute derivate along x axis for columns for given 8-bit gray image.

For all columns except the last:

for(y = 0; y < height; ++y)
    sums[y] += abs(src[x+1, y] - src[x, y]);

For the last column:

sums[width-1] = 0;

Note

This function has a C++ wrappers: Simd::GetAbsDxColSums(const View<A>& src, uint32_t * sums).

Parameters

[in]	src	- a pointer to pixels data of the input image.
[in]	stride	- a row size of the input image.
[in]	width	- an image width.
[in]	height	- an image height.
[out]	sums	- a pointer to array of unsigned 32-bit integers result columns. It length must be equal to image width.

GetColSums()

void GetColSums	(	const View< A > &	src,
		uint32_t *	sums
	)

Calculate sums of columns for given 8-bit gray image.

For all columns:

for(y = 0; y < height; ++y)
    sums[x] += src[x, y];

Note

This function is a C++ wrapper for function SimdGetColSums.

Parameters

[in]	src	- an input image.
[out]	sums	- a pointer to array of unsigned 32-bit integers result sums of columns. It length must be equal to image width.

GetAbsDxColSums()

void GetAbsDxColSums	(	const View< A > &	src,
		uint32_t *	sums
	)

Calculate sums of absolute derivate along x axis for columns for given 8-bit gray image.

For all columns except the last:

for(y = 0; y < height; ++y)
    sums[y] += abs(src[x+1, y] - src[x, y]);

For the last column:

sums[width-1] = 0;

Note

This function is a C++ wrapper for function SimdGetAbsDxColSums.

Parameters

[in]	src	- an input image.
[out]	sums	- a pointer to array of unsigned 32-bit integers result columns. It length must be equal to image width.