Functions for image resizing. More...

Enumerations
enum	SimdResizeChannelType { SimdResizeChannelByte , SimdResizeChannelShort , SimdResizeChannelFloat }

enum	SimdResizeMethodType { SimdResizeMethodNearest , SimdResizeMethodNearestPytorch , SimdResizeMethodBilinear , SimdResizeMethodBilinearCaffe , SimdResizeMethodBilinearPytorch , SimdResizeMethodBicubic , SimdResizeMethodArea , SimdResizeMethodAreaFast }

Functions
SIMD_API void	SimdReduceColor2x2 (const uint8_t src, size_t srcWidth, size_t srcHeight, size_t srcStride, uint8_t dst, size_t dstWidth, size_t dstHeight, size_t dstStride, size_t channelCount)
	Performs reducing and Gaussian blurring (in two time) a 8-bit channel color image with using window 2x2. More...

SIMD_API void	SimdReduceGray2x2 (const uint8_t src, size_t srcWidth, size_t srcHeight, size_t srcStride, uint8_t dst, size_t dstWidth, size_t dstHeight, size_t dstStride)
	Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 2x2. More...

SIMD_API void	SimdReduceGray3x3 (const uint8_t src, size_t srcWidth, size_t srcHeight, size_t srcStride, uint8_t dst, size_t dstWidth, size_t dstHeight, size_t dstStride, int compensation)
	Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 3x3. More...

SIMD_API void	SimdReduceGray4x4 (const uint8_t src, size_t srcWidth, size_t srcHeight, size_t srcStride, uint8_t dst, size_t dstWidth, size_t dstHeight, size_t dstStride)
	Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 4x4. More...

SIMD_API void	SimdReduceGray5x5 (const uint8_t src, size_t srcWidth, size_t srcHeight, size_t srcStride, uint8_t dst, size_t dstWidth, size_t dstHeight, size_t dstStride, int compensation)
	Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 5x5. More...

SIMD_API void *	SimdResizerInit (size_t srcX, size_t srcY, size_t dstX, size_t dstY, size_t channels, SimdResizeChannelType type, SimdResizeMethodType method)
	Creates resize context. More...

SIMD_API void	SimdResizerRun (const void resizer, const uint8_t src, size_t srcStride, uint8_t *dst, size_t dstStride)
	Performs image resizing. More...

SIMD_API void	SimdStretchGray2x2 (const uint8_t src, size_t srcWidth, size_t srcHeight, size_t srcStride, uint8_t dst, size_t dstWidth, size_t dstHeight, size_t dstStride)
	Stretches input 8-bit gray image in two times. More...

template<template< class > class A>
SIMD_INLINE void	ReduceGray2x2 (const View< A > &src, View< A > &dst)
	Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 2x2. More...

template<template< class > class A>
SIMD_INLINE void	ReduceGray3x3 (const View< A > &src, View< A > &dst, bool compensation=true)
	Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 3x3. More...

template<template< class > class A>
SIMD_INLINE void	ReduceGray4x4 (const View< A > &src, View< A > &dst)
	Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 4x4. More...

template<template< class > class A>
SIMD_INLINE void	ReduceGray5x5 (const View< A > &src, View< A > &dst, bool compensation=true)
	Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 5x5. More...

template<template< class > class A>
SIMD_INLINE void	ReduceGray (const View< A > &src, View< A > &dst, ::SimdReduceType reduceType, bool compensation=true)
	Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image. More...

template<template< class > class A>
SIMD_INLINE void	Reduce2x2 (const View< A > &src, View< A > &dst)
	Performs reducing of image (in 2 times). More...

template<template< class > class A>
SIMD_INLINE void	Resize (const View< A > &src, View< A > &dst, ::SimdResizeMethodType method=::SimdResizeMethodBilinear)
	Performs resizing of image. More...

template<template< class > class A>
SIMD_INLINE void	Resize (const View< A > &src, View< A > &dst, const Point< ptrdiff_t > &size, ::SimdResizeMethodType method=::SimdResizeMethodBilinear)
	Performs resizing of image. More...

template<template< class > class A>
SIMD_INLINE void	StretchGray2x2 (const View< A > &src, View< A > &dst)
	Stretches input 8-bit gray image in two times. More...

Detailed Description

Functions for image resizing.

Enumeration Type Documentation

◆ SimdResizeChannelType

enum SimdResizeChannelType

Describes resized image channel types.

Enumerator
SimdResizeChannelByte	8-bit integer channel type.
SimdResizeChannelShort	16-bit integer channel type.
SimdResizeChannelFloat	32-bit float channel type.

◆ SimdResizeMethodType

enum SimdResizeMethodType

Describes methods used in order to resize image.

Enumerator
SimdResizeMethodNearest	Nearest method.
SimdResizeMethodNearestPytorch	Nearest Pytorch compatible method.
SimdResizeMethodBilinear	Bilinear method.
SimdResizeMethodBilinearCaffe	Bilinear Caffe compatible method. It is relevant only for SimdResizeChannelFloat (32-bit float channel type).
SimdResizeMethodBilinearPytorch	Bilinear Pytorch compatible method. It is relevant only for SimdResizeChannelFloat (32-bit float channel type).
SimdResizeMethodBicubic	Bicubic method.
SimdResizeMethodArea	Area method.
SimdResizeMethodAreaFast	Area method for previously reduced in 2 times image.

Function Documentation

◆ SimdReduceColor2x2()

void SimdReduceColor2x2	(	const uint8_t *	src,
		size_t	srcWidth,
		size_t	srcHeight,
		size_t	srcStride,
		uint8_t *	dst,
		size_t	dstWidth,
		size_t	dstHeight,
		size_t	dstStride,
		size_t	channelCount
	)

Performs reducing and Gaussian blurring (in two time) a 8-bit channel color image with using window 2x2.

For input and output image must be performed: dstWidth = (srcWidth + 1)/2, dstHeight = (srcHeight + 1)/2.

For all points:

dst[x, y, c] = (src[2*x, 2*y, c] + src[2*x, 2*y + 1, c] + src[2*x + 1, 2*y, c] + src[2*x + 1, 2*y + 1, c] + 2)/4;

Note: This function has a C++ wrappers: Simd::Reduce2x2(const View<A> & src, View<A> & dst).

Parameters

[in]	src	- a pointer to pixels data of the original input image.
[in]	srcWidth	- a width of the input image.
[in]	srcHeight	- a height of the input image.
[in]	srcStride	- a row size of the input image.
[out]	dst	- a pointer to pixels data of the reduced output image.
[in]	dstWidth	- a width of the output image.
[in]	dstHeight	- a height of the output image.
[in]	dstStride	- a row size of the output image.
[in]	channelCount	- a nmber of channels for input and output images.

◆ SimdReduceGray2x2()

void SimdReduceGray2x2	(	const uint8_t *	src,
		size_t	srcWidth,
		size_t	srcHeight,
		size_t	srcStride,
		uint8_t *	dst,
		size_t	dstWidth,
		size_t	dstHeight,
		size_t	dstStride
	)

Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 2x2.

For input and output image must be performed: dstWidth = (srcWidth + 1)/2, dstHeight = (srcHeight + 1)/2.

For all points:

dst[x, y] = (src[2*x, 2*y] + src[2*x, 2*y + 1] + src[2*x + 1, 2*y] + src[2*x + 1, 2*y + 1] + 2)/4;

Note: This function has a C++ wrappers: Simd::ReduceGray2x2(const View<A>& src, View<A>& dst).

Parameters

[in]	src	- a pointer to pixels data of the original input image.
[in]	srcWidth	- a width of the input image.
[in]	srcHeight	- a height of the input image.
[in]	srcStride	- a row size of the input image.
[out]	dst	- a pointer to pixels data of the reduced output image.
[in]	dstWidth	- a width of the output image.
[in]	dstHeight	- a height of the output image.
[in]	dstStride	- a row size of the output image.

◆ SimdReduceGray3x3()

void SimdReduceGray3x3	(	const uint8_t *	src,
		size_t	srcWidth,
		size_t	srcHeight,
		size_t	srcStride,
		uint8_t *	dst,
		size_t	dstWidth,
		size_t	dstHeight,
		size_t	dstStride,
		int	compensation
	)

Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 3x3.

For input and output image must be performed: dstWidth = (srcWidth + 1)/2, dstHeight = (srcHeight + 1)/2.

For every point:

dst[x, y] = (src[2*x-1, 2*y-1] + 2*src[2*x, 2*y-1] + src[2*x+1, 2*y-1] +
          2*(src[2*x-1, 2*y]   + 2*src[2*x, 2*y]   + src[2*x+1, 2*y]) +
             src[2*x-1, 2*y+1] + 2*src[2*x, 2*y+1] + src[2*x+1, 2*y+1] + compensation ? 8 : 0) / 16;

Note: This function has a C++ wrappers: Simd::ReduceGray3x3(const View<A>& src, View<A>& dst, bool compensation).

Parameters

[in]	src	- a pointer to pixels data of the original input image.
[in]	srcWidth	- a width of the input image.
[in]	srcHeight	- a height of the input image.
[in]	srcStride	- a row size of the input image.
[out]	dst	- a pointer to pixels data of the reduced output image.
[in]	dstWidth	- a width of the output image.
[in]	dstHeight	- a height of the output image.
[in]	dstStride	- a row size of the output image.
[in]	compensation	- a flag of compensation of rounding.

◆ SimdReduceGray4x4()

void SimdReduceGray4x4	(	const uint8_t *	src,
		size_t	srcWidth,
		size_t	srcHeight,
		size_t	srcStride,
		uint8_t *	dst,
		size_t	dstWidth,
		size_t	dstHeight,
		size_t	dstStride
	)

Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 4x4.

For input and output image must be performed: dstWidth = (srcWidth + 1)/2, dstHeight = (srcHeight + 1)/2.

For every point:

dst[x, y] = (src[2*x-1, 2*y-1] + 3*src[2*x, 2*y-1] + 3*src[2*x+1, 2*y-1] + src[2*x+2, 2*y-1]
          3*(src[2*x-1, 2*y]   + 3*src[2*x, 2*y]   + 3*src[2*x+1, 2*y]   + src[2*x+2, 2*y]) +
          3*(src[2*x-1, 2*y+1] + 3*src[2*x, 2*y+1] + 3*src[2*x+1, 2*y+1] + src[2*x+2, 2*y+1]) +
             src[2*x-1, 2*y+2] + 3*src[2*x, 2*y+2] + 3*src[2*x+1, 2*y+2] + src[2*x+2, 2*y+2] + 32) / 64;

Note: This function has a C++ wrappers: Simd::ReduceGray4x4(const View<A>& src, View<A>& dst).

Parameters

[in]	src	- a pointer to pixels data of the original input image.
[in]	srcWidth	- a width of the input image.
[in]	srcHeight	- a height of the input image.
[in]	srcStride	- a row size of the input image.
[out]	dst	- a pointer to pixels data of the reduced output image.
[in]	dstWidth	- a width of the output image.
[in]	dstHeight	- a height of the output image.
[in]	dstStride	- a row size of the output image.

◆ SimdReduceGray5x5()

void SimdReduceGray5x5	(	const uint8_t *	src,
		size_t	srcWidth,
		size_t	srcHeight,
		size_t	srcStride,
		uint8_t *	dst,
		size_t	dstWidth,
		size_t	dstHeight,
		size_t	dstStride,
		int	compensation
	)

Performs reducing and Gaussian blurring (in two time) a 8-bit gray image with using window 5x5.

For input and output image must be performed: dstWidth = (srcWidth + 1)/2, dstHeight = (srcHeight + 1)/2.

For every point:

dst[x, y] = (
       src[2*x-2, 2*y-2] + 4*src[2*x-1, 2*y-2] + 6*src[2*x, 2*y-2] + 4*src[2*x+1, 2*y-2] + src[2*x+2, 2*y-2] +
    4*(src[2*x-2, 2*y-1] + 4*src[2*x-1, 2*y-1] + 6*src[2*x, 2*y-1] + 4*src[2*x+1, 2*y-1] + src[2*x+2, 2*y-1]) +
    6*(src[2*x-2, 2*y]   + 4*src[2*x-1, 2*y]   + 6*src[2*x, 2*y]   + 4*src[2*x+1, 2*y]   + src[2*x+2, 2*y]) +
    4*(src[2*x-2, 2*y+1] + 4*src[2*x-1, 2*y+1] + 6*src[2*x, 2*y+1] + 4*src[2*x+1, 2*y+1] + src[2*x+2, 2*y+1]) +
       src[2*x-2, 2*y+2] + 4*src[2*x-1, 2*y+2] + 6*src[2*x, 2*y+2] + 4*src[2*x+1, 2*y+2] + src[2*x+2, 2*y+2] +
    compensation ? 128 : 0) / 256;

Note: This function has a C++ wrappers: Simd::ReduceGray5x5(const Viewc<A>& src, View<A>& dst, bool compensation).

Parameters

[in]	src	- a pointer to pixels data of the original input image.
[in]	srcWidth	- a width of the input image.
[in]	srcHeight	- a height of the input image.
[in]	srcStride	- a row size of the input image.
[out]	dst	- a pointer to pixels data of the reduced output image.
[in]	dstWidth	- a width of the output image.
[in]	dstHeight	- a height of the output image.
[in]	dstStride	- a row size of the output image.
[in]	compensation	- a flag of compensation of rounding.

◆ SimdResizerInit()

void * SimdResizerInit	(	size_t	srcX,
		size_t	srcY,
		size_t	dstX,
		size_t	dstY,
		size_t	channels,
		SimdResizeChannelType	type,
		SimdResizeMethodType	method
	)

Creates resize context.

An using example (resize of RGBA64 image):

void * resizer = SimdResizerInit(srcX, srcY, dstX, dstY, 4, SimdResizeChannelShort, SimdResizeMethodBilinear);
if (resizer)
{
     SimdResizerRun(resizer, (uint8_t*)src, srcStride, (uint8_t*)dst, dstStride);
     SimdRelease(resizer);
}

Parameters

[in]	srcX	- a width of the input image.
[in]	srcY	- a height of the input image.
[in]	dstX	- a width of the output image.
[in]	dstY	- a height of the output image.
[in]	channels	- a channel number of input and output image.
[in]	type	- a type of input and output image channel.
[in]	method	- a method used in order to resize image.

Returns: a pointer to resize context. On error it returns NULL. This pointer is used in functions SimdResizerRun. It must be released with using of function SimdRelease.

◆ SimdResizerRun()

void SimdResizerRun	(	const void *	resizer,
		const uint8_t *	src,
		size_t	srcStride,
		uint8_t *	dst,
		size_t	dstStride
	)

Performs image resizing.

Parameters

[in]	resizer	- a resize context. It must be created by function SimdResizerInit and released by function SimdRelease.
[in]	src	- a pointer to pixels data of the original input image.
[in]	srcStride	- a row size (in bytes) of the input image.
[out]	dst	- a pointer to pixels data of the resized output image.
[in]	dstStride	- a row size (in bytes) of the output image.

◆ SimdStretchGray2x2()

void SimdStretchGray2x2	(	const uint8_t *	src,
		size_t	srcWidth,
		size_t	srcHeight,
		size_t	srcStride,
		uint8_t *	dst,
		size_t	dstWidth,
		size_t	dstHeight,
		size_t	dstStride
	)

Stretches input 8-bit gray image in two times.

Note: This function has a C++ wrappers: Simd::StretchGray2x2(const View<A>& src, View<A>& dst).

Parameters

[in]	src	- a pointer to pixels data of the original input image.
[in]	srcWidth	- a width of the input image.
[in]	srcHeight	- a height of the input image.
[in]	srcStride	- a row size of the input image.
[out]	dst	- a pointer to pixels data of the stretched output image.
[in]	dstWidth	- a width of the output image.
[in]	dstHeight	- a height of the output image.
[in]	dstStride	- a row size of the output image.

◆ ReduceGray2x2()

void ReduceGray2x2	(	const View< A > &	src,
		View< A > &	dst
	)

Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 2x2.

For input and output image must be performed: dst.width = (src.width + 1)/2, dst.height = (src.height + 1)/2.

For all points:

dst[x, y] = (src[2*x, 2*y] + src[2*x, 2*y + 1] + src[2*x + 1, 2*y] + src[2*x + 1, 2*y + 1] + 2)/4;

Note: This function is a C++ wrapper for function SimdReduceGray2x2.

Parameters

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

◆ ReduceGray3x3()

void ReduceGray3x3	(	const View< A > &	src,
		View< A > &	dst,
		bool	compensation = `true`
	)

Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 3x3.

For input and output image must be performed: dst.width = (src.width + 1)/2, dst.height = (src.height + 1)/2.

For every point:

dst[x, y] = (src[2*x-1, 2*y-1] + 2*src[2*x, 2*y-1] + src[2*x+1, 2*y-1] +
          2*(src[2*x-1, 2*y]   + 2*src[2*x, 2*y]   + src[2*x+1, 2*y]) +
             src[2*x-1, 2*y+1] + 2*src[2*x, 2*y+1] + src[2*x+1, 2*y+1] + compensation ? 8 : 0) / 16;

Note: This function is a C++ wrapper for function SimdReduceGray3x3.

Parameters

[in]	src	- an original input image.
[out]	dst	- a reduced output image.
[in]	compensation	- a flag of compensation of rounding. It is equal to 'true' by default.

◆ ReduceGray4x4()

void ReduceGray4x4	(	const View< A > &	src,
		View< A > &	dst
	)

Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 4x4.

For input and output image must be performed: dst.width = (src.width + 1)/2, dst.height = (src.height + 1)/2.

For every point:

dst[x, y] =   (src[2*x-1, 2*y-1] + 3*src[2*x, 2*y-1] + 3*src[2*x+1, 2*y-1] + src[2*x+2, 2*y-1]
            3*(src[2*x-1, 2*y]   + 3*src[2*x, 2*y]   + 3*src[2*x+1, 2*y]   + src[2*x+2, 2*y]) +
            3*(src[2*x-1, 2*y+1] + 3*src[2*x, 2*y+1] + 3*src[2*x+1, 2*y+1] + src[2*x+2, 2*y+1]) +
               src[2*x-1, 2*y+2] + 3*src[2*x, 2*y+2] + 3*src[2*x+1, 2*y+2] + src[2*x+2, 2*y+2] + 32) / 64;

Note: This function is a C++ wrapper for function SimdReduceGray4x4.

Parameters

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

◆ ReduceGray5x5()

void ReduceGray5x5	(	const View< A > &	src,
		View< A > &	dst,
		bool	compensation = `true`
	)

Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image with using window 5x5.

For input and output image must be performed: dst.width = (src.width + 1)/2, dst.height = (src.height + 1)/2.

For every point:

dst[x, y] = (
       src[2*x-2, 2*y-2] + 4*src[2*x-1, 2*y-2] + 6*src[2*x, 2*y-2] + 4*src[2*x+1, 2*y-2] + src[2*x+2, 2*y-2] +
    4*(src[2*x-2, 2*y-1] + 4*src[2*x-1, 2*y-1] + 6*src[2*x, 2*y-1] + 4*src[2*x+1, 2*y-1] + src[2*x+2, 2*y-1]) +
    6*(src[2*x-2, 2*y]   + 4*src[2*x-1, 2*y]   + 6*src[2*x, 2*y]   + 4*src[2*x+1, 2*y]   + src[2*x+2, 2*y]) +
    4*(src[2*x-2, 2*y+1] + 4*src[2*x-1, 2*y+1] + 6*src[2*x, 2*y+1] + 4*src[2*x+1, 2*y+1] + src[2*x+2, 2*y+1]) +
       src[2*x-2, 2*y+2] + 4*src[2*x-1, 2*y+2] + 6*src[2*x, 2*y+2] + 4*src[2*x+1, 2*y+2] + src[2*x+2, 2*y+2] +
    compensation ? 128 : 0) / 256;

Note: This function is a C++ wrapper for function SimdReduceGray5x5.

Parameters

[in]	src	- an original input image.
[out]	dst	- a reduced output image.
[in]	compensation	- a flag of compensation of rounding. It is equal to 'true' by default.

◆ ReduceGray()

void ReduceGray	(	const View< A > &	src,
		View< A > &	dst,
		::SimdReduceType	reduceType,
		bool	compensation = `true`
	)

Performs reducing (in 2 times) and Gaussian blurring a 8-bit gray image.

For input and output image must be performed: dst.width = (src.width + 1)/2, dst.height = (src.height + 1)/2.

Parameters

[in]	src	- an original input image.
[out]	dst	- a reduced output image.
[in]	reduceType	- a type of function used for image reducing.
[in]	compensation	- a flag of compensation of rounding. It is relevant only for SimdReduce3x3 and SimdReduce5x5. It is equal to 'true' by default.

◆ Reduce2x2()

void Reduce2x2	(	const View< A > &	src,
		View< A > &	dst
	)

Performs reducing of image (in 2 times).

For input and output image must be performed: dst.width = (src.width + 1)/2, dst.height = (src.height + 1)/2.

Parameters

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

◆ Resize() [1/2]

void Resize	(	const View< A > &	src,
		View< A > &	dst,
		::SimdResizeMethodType	method = `::SimdResizeMethodBilinear`
	)

Performs resizing of image.

All images must have the same format.

Parameters

[in]	src	- an original input image.
[out]	dst	- a resized output image.
[in]	method	- a resizing method. By default it is equal to SimdResizeMethodBilinear.

◆ Resize() [2/2]

void Resize	(	const View< A > &	src,
		View< A > &	dst,
		const Point< ptrdiff_t > &	size,
		::SimdResizeMethodType	method = `::SimdResizeMethodBilinear`
	)

Performs resizing of image.

Parameters

[in]	src	- an original input image.
[out]	dst	- a resized output image. The input image can be the output.
[in]	size	- a size of output image.
[in]	method	- a resizing method. By default it is equal to SimdResizeMethodBilinear.

◆ StretchGray2x2()

void StretchGray2x2	(	const View< A > &	src,
		View< A > &	dst
	)

Stretches input 8-bit gray image in two times.

Note: This function is a C++ wrapper for function SimdStretchGray2x2.

Parameters

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

Simd Library Documentation.

Enumerations

Functions

Detailed Description

Enumeration Type Documentation

◆ SimdResizeChannelType

◆ SimdResizeMethodType

Function Documentation

◆ SimdReduceColor2x2()

◆ SimdReduceGray2x2()

◆ SimdReduceGray3x3()

◆ SimdReduceGray4x4()

◆ SimdReduceGray5x5()

◆ SimdResizerInit()

◆ SimdResizerRun()

◆ SimdStretchGray2x2()

◆ ReduceGray2x2()

◆ ReduceGray3x3()

◆ ReduceGray4x4()

◆ ReduceGray5x5()

◆ ReduceGray()

◆ Reduce2x2()

◆ Resize() [1/2]

◆ Resize() [2/2]

◆ StretchGray2x2()