Sobel image filters. More...

Functions
SIMD_API void	SimdSobelDx (const uint8_t src, size_t srcStride, size_t width, size_t height, uint8_t dst, size_t dstStride)
	Calculates the horizontal Sobel derivative of an 8-bit gray image. More...

SIMD_API void	SimdSobelDxAbs (const uint8_t src, size_t srcStride, size_t width, size_t height, uint8_t dst, size_t dstStride)
	Calculates the absolute horizontal Sobel derivative of an 8-bit gray image. More...

SIMD_API void	SimdSobelDy (const uint8_t src, size_t srcStride, size_t width, size_t height, uint8_t dst, size_t dstStride)
	Calculates the vertical Sobel derivative of an 8-bit gray image. More...

SIMD_API void	SimdSobelDyAbs (const uint8_t src, size_t srcStride, size_t width, size_t height, uint8_t dst, size_t dstStride)
	Calculates the absolute vertical Sobel derivative of an 8-bit gray image. More...

template<template< class > class A>
SIMD_INLINE void	SobelDx (const View< A > &src, View< A > &dst)
	Calculates Sobel's filter along x axis. More...

template<template< class > class A>
SIMD_INLINE void	SobelDxAbs (const View< A > &src, View< A > &dst)
	Calculates absolute value of Sobel's filter along x axis. More...

template<template< class > class A>
SIMD_INLINE void	SobelDy (const View< A > &src, View< A > &dst)
	Calculates Sobel's filter along y axis. More...

template<template< class > class A>
SIMD_INLINE void	SobelDyAbs (const View< A > &src, View< A > &dst)
	Calculates absolute value of Sobel's filter along y axis. More...

Detailed Description

Sobel image filters.

Function Documentation

◆ SimdSobelDx()

void SimdSobelDx	(	const uint8_t *	src,
		size_t	srcStride,
		size_t	width,
		size_t	height,
		uint8_t *	dst,
		size_t	dstStride
	)

Calculates the horizontal Sobel derivative of an 8-bit gray image.

Input image must have 8-bit gray format, output image must have signed 16-bit integer format. All images must have the same width and height, and width must be greater than 1. At image borders the nearest valid source row or column is reused.

For every point:

x0 = Max(x - 1, 0); x2 = Min(x + 1, width - 1);
y0 = Max(y - 1, 0); y2 = Min(y + 1, height - 1);
dst[x, y] = (src[x2, y0] + 2*src[x2, y] + src[x2, y2]) -
            (src[x0, y0] + 2*src[x0, y] + src[x0, y2]);

Note: This function has a C++ wrappers: Simd::SobelDx(const View<A>& src, View<A>& dst).

Parameters

[in]	src	- a pointer to pixels data of the input image.
[in]	srcStride	- a row size of the input image in bytes.
[in]	width	- an image width.
[in]	height	- an image height.
[out]	dst	- a pointer to pixels data of the signed 16-bit output image.
[in]	dstStride	- a row size of the output image in bytes. It must be a multiple of sizeof(int16_t).

◆ SimdSobelDxAbs()

void SimdSobelDxAbs	(	const uint8_t *	src,
		size_t	srcStride,
		size_t	width,
		size_t	height,
		uint8_t *	dst,
		size_t	dstStride
	)

Calculates the absolute horizontal Sobel derivative of an 8-bit gray image.

Input image must have 8-bit gray format, output image must have signed 16-bit integer format. All images must have the same width and height, and width must be greater than 1. At image borders the nearest valid source row or column is reused.

For every point:

x0 = Max(x - 1, 0); x2 = Min(x + 1, width - 1);
y0 = Max(y - 1, 0); y2 = Min(y + 1, height - 1);
dst[x, y] = Abs((src[x2, y0] + 2*src[x2, y] + src[x2, y2]) -
                (src[x0, y0] + 2*src[x0, y] + src[x0, y2]));

Note: This function has a C++ wrappers: Simd::SobelDxAbs(const View<A>& src, View<A>& dst).

Parameters

[in]	src	- a pointer to pixels data of the input image.
[in]	srcStride	- a row size of the input image in bytes.
[in]	width	- an image width.
[in]	height	- an image height.
[out]	dst	- a pointer to pixels data of the signed 16-bit output image.
[in]	dstStride	- a row size of the output image in bytes. It must be a multiple of sizeof(int16_t).

◆ SimdSobelDy()

void SimdSobelDy	(	const uint8_t *	src,
		size_t	srcStride,
		size_t	width,
		size_t	height,
		uint8_t *	dst,
		size_t	dstStride
	)

Calculates the vertical Sobel derivative of an 8-bit gray image.

Input image must have 8-bit gray format, output image must have signed 16-bit integer format. All images must have the same width and height, and width must be greater than 1. At image borders the nearest valid source row or column is reused.

For every point:

x0 = Max(x - 1, 0); x2 = Min(x + 1, width - 1);
y0 = Max(y - 1, 0); y2 = Min(y + 1, height - 1);
dst[x, y] = (src[x0, y2] + 2*src[x, y2] + src[x2, y2]) -
            (src[x0, y0] + 2*src[x, y0] + src[x2, y0]);

Note: This function has a C++ wrappers: Simd::SobelDy(const View<A>& src, View<A>& dst).

Parameters

[in]	src	- a pointer to pixels data of the input image.
[in]	srcStride	- a row size of the input image in bytes.
[in]	width	- an image width.
[in]	height	- an image height.
[out]	dst	- a pointer to pixels data of the signed 16-bit output image.
[in]	dstStride	- a row size of the output image in bytes. It must be a multiple of sizeof(int16_t).

◆ SimdSobelDyAbs()

void SimdSobelDyAbs	(	const uint8_t *	src,
		size_t	srcStride,
		size_t	width,
		size_t	height,
		uint8_t *	dst,
		size_t	dstStride
	)

Calculates the absolute vertical Sobel derivative of an 8-bit gray image.

Input image must have 8-bit gray format, output image must have signed 16-bit integer format. All images must have the same width and height, and width must be greater than 1. At image borders the nearest valid source row or column is reused.

For every point:

x0 = Max(x - 1, 0); x2 = Min(x + 1, width - 1);
y0 = Max(y - 1, 0); y2 = Min(y + 1, height - 1);
dst[x, y] = Abs((src[x0, y2] + 2*src[x, y2] + src[x2, y2]) -
                (src[x0, y0] + 2*src[x, y0] + src[x2, y0]));

Note: This function has a C++ wrappers: Simd::SobelDyAbs(const View<A>& src, View<A>& dst).

Parameters

[in]	src	- a pointer to pixels data of the input image.
[in]	srcStride	- a row size of the input image in bytes.
[in]	width	- an image width.
[in]	height	- an image height.
[out]	dst	- a pointer to pixels data of the signed 16-bit output image.
[in]	dstStride	- a row size of the output image in bytes. It must be a multiple of sizeof(int16_t).

◆ SobelDx()

void SobelDx	(	const View< A > &	src,
		View< A > &	dst
	)

Calculates Sobel's filter along x axis.

All images must have the same width and height. Input image must have 8-bit gray format, output image must have 16-bit integer format.

For every point:

dst[x, y] = (src[x+1,y-1] + 2*src[x+1, y] + src[x+1, y+1]) - (src[x-1,y-1] + 2*src[x-1, y] + src[x-1, y+1]).

Note: This function is a C++ wrapper for function SimdSobelDx.

Parameters

[in]	src	- an input image.
[out]	dst	- an output image.

◆ SobelDxAbs()

void SobelDxAbs	(	const View< A > &	src,
		View< A > &	dst
	)

Calculates absolute value of Sobel's filter along x axis.

All images must have the same width and height. Input image must have 8-bit gray format, output image must have 16-bit integer format.

For every point:

dst[x, y] = abs((src[x+1,y-1] + 2*src[x+1, y] + src[x+1, y+1]) - (src[x-1,y-1] + 2*src[x-1, y] + src[x-1, y+1])).

Note: This function is a C++ wrapper for function SimdSobelDxAbs.

Parameters

[in]	src	- an input image.
[out]	dst	- an output image.

◆ SobelDy()

void SobelDy	(	const View< A > &	src,
		View< A > &	dst
	)

Calculates Sobel's filter along y axis.

All images must have the same width and height. Input image must have 8-bit gray format, output image must have 16-bit integer format.

For every point:

dst[x, y] = (src[x-1,y+1] + 2*src[x, y+1] + src[x+1, y+1]) - (src[x-1,y-1] + 2*src[x, y-1] + src[x+1, y-1]);

Note: This function is a C++ wrapper for function SimdSobelDy.

Parameters

[in]	src	- an input image.
[out]	dst	- an output image.

◆ SobelDyAbs()

void SobelDyAbs	(	const View< A > &	src,
		View< A > &	dst
	)

Calculates absolute value of Sobel's filter along y axis.

All images must have the same width and height. Input image must have 8-bit gray format, output image must have 16-bit integer format.

For every point:

dst[x, y] = abs((src[x-1,y+1] + 2*src[x, y+1] + src[x+1, y+1]) - (src[x-1,y-1] + 2*src[x, y-1] + src[x+1, y-1]));

Note: This function is a C++ wrapper for function SimdSobelDyAbs.

Parameters

[in]	src	- an input image.
[out]	dst	- an output image.

Simd Library Documentation.

Functions

Detailed Description

Function Documentation

◆ SimdSobelDx()

◆ SimdSobelDxAbs()

◆ SimdSobelDy()

◆ SimdSobelDyAbs()

◆ SobelDx()

◆ SobelDxAbs()

◆ SobelDy()

◆ SobelDyAbs()