VXLIB_absDiff_i8u_i8u_o8u

Functions
VXLIB_STATUS	VXLIB_absDiff_i8u_i8u_o8u (const uint8_t src0[restrict], const VXLIB_bufParams2D_t *src0_addr, const uint8_t src1[restrict], const VXLIB_bufParams2D_t *src1_addr, uint8_t dst[restrict], const VXLIB_bufParams2D_t *dst_addr)
VXLIB_STATUS	VXLIB_absDiff_i8u_i8u_o8u_checkParams (const uint8_t src0[], const VXLIB_bufParams2D_t *src0_addr, const uint8_t src1[], const VXLIB_bufParams2D_t *src1_addr, const uint8_t dst[], const VXLIB_bufParams2D_t *dst_addr)

Detailed Description

Function Documentation

VXLIB_absDiff_i8u_i8u_o8u()

VXLIB_STATUS VXLIB_absDiff_i8u_i8u_o8u	(	const uint8_t	src0[restrict],
		const VXLIB_bufParams2D_t *	src0_addr,
		const uint8_t	src1[restrict],
		const VXLIB_bufParams2D_t *	src1_addr,
		uint8_t	dst[restrict],
		const VXLIB_bufParams2D_t *	dst_addr
	)

Description:

Computes the pixel-wise absolute difference between two unsigned 8-bit images.

Method:

The absolute difference is computed using the following equation:

 dst(x,y) = | src0(x,y) - src1(x,y) |

Parameters

[in]	src0[]	Pointer to array containing first input image (UQ8.0)
[in]	src0_addr[]	Pointer to structure containing dimensional information of src0
[in]	src1[]	Pointer to array containing second input image (UQ8.0)
[in]	src1_addr[]	Pointer to structure containing dimensional information of src1
[out]	dst[]	Pointer to array containing output image (UQ8.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst

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
  • Align all pointers to 8 byte boundaries
  • Set all stride values to a multiple of 8
  • Set all width values to a multiple of 16

VXLIB_absDiff_i8u_i8u_o8u_checkParams()

VXLIB_STATUS VXLIB_absDiff_i8u_i8u_o8u_checkParams	(	const uint8_t	src0[],
		const VXLIB_bufParams2D_t *	src0_addr,
		const uint8_t	src1[],
		const VXLIB_bufParams2D_t *	src1_addr,
		const uint8_t	dst[],
		const VXLIB_bufParams2D_t *	dst_addr
	)

Description:

Checks the parameters for programming errors for the VXLIB_absDiff_i8u_i8u_o8u 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

Parameters

[in]	src0[]	Pointer to array containing first input image (UQ8.0)
[in]	src0_addr[]	Pointer to structure containing dimensional information of src0
[in]	src1[]	Pointer to array containing second input image (UQ8.0)
[in]	src1_addr[]	Pointer to structure containing dimensional information of src1
[out]	dst[]	Pointer to array containing output image (UQ8.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst