VXLIB_absDiff_i8u_i8u_o8u

Detailed Description


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)

Function Documentation

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_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

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