Linear Filters

Functions
void	arm_gaussian_filter_3x3_fixp (const arm_cv_image_gray8_t *imageIn, arm_cv_image_gray8_t *imageOut, q15_t *scratch, const int8_t borderType)
	Gaussian filter applying a 3x3 kernel and using q15 as intermediate values.
void	arm_gaussian_filter_5x5_fixp (const arm_cv_image_gray8_t *imageIn, arm_cv_image_gray8_t *imageOut, q15_t *scratch, const int8_t borderType)
	Gaussian filter applying a 5x5 kernel and using q15 as intermediate values.
void	arm_gaussian_filter_7x7_buffer_15_fixp (const arm_cv_image_gray8_t *imageIn, arm_cv_image_gray8_t *imageOut, q15_t *scratch, const int8_t borderType)
	Gaussian filter applying a 7x7 kernel and using q15 as intermediate values.
void	arm_gaussian_filter_7x7_buffer_31_fixp (const arm_cv_image_gray8_t *imageIn, arm_cv_image_gray8_t *imageOut, q31_t *scratch, const int8_t borderType)
	Gaussian filter applying a 7x7 kernel and using q31 as intermediate values.
uint16_t	arm_get_linear_scratch_size_buffer_15 (const int width)
	Return the scratch size for generic linear filter function using a q15 buffer.
uint16_t	arm_get_linear_scratch_size_buffer_31 (const int width)
	Return the scratch size for generic linear filter function using a q31 buffer.
uint16_t	arm_get_scratch_size_sobel (const int width)
	Return the scratch size for sobel functions using a q15 buffer.
void	arm_sobel_horizontal (const arm_cv_image_gray8_t *imageIn, arm_cv_image_q15_t *imageOut, q15_t *scratch, const int8_t borderType)
	Sobel filter computing the gradient on the horizontal axis.
void	arm_sobel_vertical (const arm_cv_image_gray8_t *imageIn, arm_cv_image_q15_t *imageOut, q15_t *scratch, const int8_t borderType)
	Sobel filter computing the gradient on the vertical axis.

Description

Function Documentation

arm_gaussian_filter_3x3_fixp()

void arm_gaussian_filter_3x3_fixp	(	const arm_cv_image_gray8_t *	imageIn,
		arm_cv_image_gray8_t *	imageOut,
		q15_t *	scratch,
		const int8_t	borderType
	)

Gaussian filter applying a 3x3 kernel and using q15 as intermediate values.

Parameters

[in]	imageIn	The input image
[out]	imageOut	The output image
[in,out]	scratch	Temporary buffer
[in]	borderType	Type of border to use, supported are Replicate Wrap and Reflect

Temporary buffer sizing:

Will use a temporary buffer to store intermediate values of gradient and magnitude.

Size of temporary buffer is given by arm_cv_get_scratch_size_generic(int width)

arm_gaussian_filter_5x5_fixp()

void arm_gaussian_filter_5x5_fixp	(	const arm_cv_image_gray8_t *	imageIn,
		arm_cv_image_gray8_t *	imageOut,
		q15_t *	scratch,
		const int8_t	borderType
	)

Gaussian filter applying a 5x5 kernel and using q15 as intermediate values.

Parameters

[in]	imageIn	The input image
[out]	imageOut	The output image
[in,out]	scratch	Temporary buffer
[in]	borderType	Type of border to use, supported are Replicate Wrap and Reflect

Temporary buffer sizing:

Will use a temporary buffer to store intermediate values of gradient and magnitude.

Size of temporary buffer is given by arm_cv_get_scratch_size_generic(int width)

arm_gaussian_filter_7x7_buffer_15_fixp()

void arm_gaussian_filter_7x7_buffer_15_fixp	(	const arm_cv_image_gray8_t *	imageIn,
		arm_cv_image_gray8_t *	imageOut,
		q15_t *	scratch,
		const int8_t	borderType
	)

Gaussian filter applying a 7x7 kernel and using q15 as intermediate values.

Parameters

[in]	imageIn	The input image
[out]	imageOut	The output image
[in,out]	scratch	Temporary buffer
[in]	borderType	Type of border to use, supported are Replicate Wrap and Reflect

Temporary buffer sizing:

Will use a temporary buffer to store intermediate values of gradient and magnitude.

Size of temporary buffer is given by arm_cv_get_scratch_size_generic(int width)

arm_gaussian_filter_7x7_buffer_31_fixp()

void arm_gaussian_filter_7x7_buffer_31_fixp	(	const arm_cv_image_gray8_t *	imageIn,
		arm_cv_image_gray8_t *	imageOut,
		q31_t *	scratch,
		const int8_t	borderType
	)

Gaussian filter applying a 7x7 kernel and using q31 as intermediate values.

Parameters

[in]	imageIn	The input image
[out]	imageOut	The output image
[in,out]	scratch	Temporary buffer
[in]	borderType	Type of border to use, supported are Replicate Wrap and Reflect

Temporary buffer sizing:

Will use a temporary buffer to store intermediate values of gradient and magnitude.

Size of temporary buffer is given by arm_cv_get_scratch_size_generic(int width)

arm_get_linear_scratch_size_buffer_15()

uint16_t arm_get_linear_scratch_size_buffer_15

(

const int

width

)

Return the scratch size for generic linear filter function using a q15 buffer.

Parameters

[in]

width

The width of the image in pixels

Returns

Scratch size in bytes

arm_get_linear_scratch_size_buffer_31()

uint16_t arm_get_linear_scratch_size_buffer_31

(

const int

width

)

Return the scratch size for generic linear filter function using a q31 buffer.

Parameters

[in]

width

The width of the image in pixels

Returns

Scratch size in bytes

arm_get_scratch_size_sobel()

uint16_t arm_get_scratch_size_sobel

(

const int

width

)

Return the scratch size for sobel functions using a q15 buffer.

Parameters

[in]

width

The width of the image in pixels

Returns

Scratch size in bytes

arm_sobel_horizontal()

void arm_sobel_horizontal	(	const arm_cv_image_gray8_t *	imageIn,
		arm_cv_image_q15_t *	imageOut,
		q15_t *	scratch,
		const int8_t	borderType
	)

Sobel filter computing the gradient on the horizontal axis.

Parameters

[in]	imageIn	The input image
[out]	imageOut	The output image
[in,out]	scratch	Buffer
[in]	borderType	Type of border to use, supported are Replicate Wrap and Reflect

Temporary buffer sizing:

Will use a temporary buffer to store intermediate values of gradient and magnitude.

Size of temporary buffer is given by arm_cv_get_scratch_size_sobel_y(int width)

arm_sobel_vertical()

void arm_sobel_vertical	(	const arm_cv_image_gray8_t *	imageIn,
		arm_cv_image_q15_t *	imageOut,
		q15_t *	scratch,
		const int8_t	borderType
	)

Sobel filter computing the gradient on the vertical axis.

Parameters

[in]	imageIn	The input image
[out]	imageOut	The output image
[in,out]	scratch	Buffer
[in]	borderType	Type of border to use, supported are Replicate Wrap and Reflect