VXLIB_accumulateSquareImage_i8u_io16s

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Detailed Description

Functions
VXLIB_STATUS	VXLIB_accumulateSquareImage_i8u_io16s (const uint8_t src[restrict], const VXLIB_bufParams2D_t *src_addr, int16_t dst[restrict], const VXLIB_bufParams2D_t *dst_addr, uint32_t shift)
VXLIB_STATUS	VXLIB_accumulateSquareImage_i8u_io16s_checkParams (const uint8_t src[], const VXLIB_bufParams2D_t *src_addr, const int16_t dst[], const VXLIB_bufParams2D_t *dst_addr, uint32_t shift)

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Function Documentation

VXLIB_STATUS VXLIB_accumulateSquareImage_i8u_io16s	(	const uint8_t	src[restrict],
		const VXLIB_bufParams2D_t *	src_addr,
		int16_t	dst[restrict],
		const VXLIB_bufParams2D_t *	dst_addr,
		uint32_t	shift
	)

Description:

Accumulates a squared value from an input image to an output image.

Method:

Accumulate squares is computed by:

    dst(x,y) = saturateINT16( (uint16)dst(x,y) + (((uint16)src(x,y)^2)>>(shift)) )

   

Parameters:

[in]	src[]	Pointer to array containing first input image (UQ8.0)
[in]	src_addr[]	Pointer to structure containing dimensional information of src
[in,out]	dst[]	Pointer to array containing output image (SQ15.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst
[in]	shift	Parameter indicating shift value, where 0 <= shift <= 15

Assumptions:

• I/O buffer pointers are assumed to be not aliased.

Performance Considerations:

• For best performance, the following parameter settings are recommended:
  • Set widths equal to strides
  • Set all stride values to a multiple of 8
  • Set all width values to a multiple of 8

VXLIB_STATUS VXLIB_accumulateSquareImage_i8u_io16s_checkParams	(	const uint8_t	src[],
		const VXLIB_bufParams2D_t *	src_addr,
		const int16_t	dst[],
		const VXLIB_bufParams2D_t *	dst_addr,
		uint32_t	shift
	)

Description:

Checks the parameters for programming errors for the VXLIB_accumulateImage_i8u_io16s function.

Method:

The following checks are made:

• There shall be no NULL pointers
• All images shall have the same x and y dimensions
• The strides of each image shall be equal to or greater than the x dimension
• The shift parameter shall be < 16

Parameters:

[in]	src[]	Pointer to array containing first input image (UQ8.0)
[in]	src_addr[]	Pointer to structure containing dimensional information of src
[in,out]	dst[]	Pointer to array containing output image (SQ15.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst
[in]	shift	Parameter indicating shift value, where 0 <= shift <= 15

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