VXLIB_thresholdRange_i8u_o8u

Functions
VXLIB_STATUS	VXLIB_thresholdRange_i8u_o8u (const uint8_t src[restrict], const VXLIB_bufParams2D_t *src_addr, uint8_t dst[restrict], const VXLIB_bufParams2D_t *dst_addr, uint8_t upper, uint8_t lower, uint8_t trueVal, uint8_t falseVal)
VXLIB_STATUS	VXLIB_thresholdRange_i8u_o8u_checkParams (const uint8_t src[], const VXLIB_bufParams2D_t *src_addr, const uint8_t dst[], const VXLIB_bufParams2D_t *dst_addr, uint8_t upper, uint8_t lower)

Detailed Description

Function Documentation

VXLIB_thresholdRange_i8u_o8u()

VXLIB_STATUS VXLIB_thresholdRange_i8u_o8u	(	const uint8_t	src[restrict],
		const VXLIB_bufParams2D_t *	src_addr,
		uint8_t	dst[restrict],
		const VXLIB_bufParams2D_t *	dst_addr,
		uint8_t	upper,
		uint8_t	lower,
		uint8_t	trueVal,
		uint8_t	falseVal
	)

Description:

Thresholds an unsigned 8-bit input image and produces an unsigned 8-bit output Boolean image.

Method:

The thresholding is computed using the following equation:

 dst(x,y) = falseValue    if src(x,y) > upper
 dst(x,y) = falseValue    if src(x,y) < lower
 dst(x,y) = trueValue     otherwise

Parameters

[in]	src[]	Pointer to array containing first input image (UQ8.0)
[in]	src_addr[]	Pointer to structure containing dimensional information of src
[out]	dst[]	Pointer to array containing output image (UQ8.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst
[in]	upper	Parameter indicating upper threshold value
[in]	lower	Parameter indicating lower threshold value
[in]	trueVal	Parameter indicating true value for the output, if the input is outside the thresholds
[in]	falseVal	Parameter indicating false value for the output, if the input is within the thresholds

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 16
  • Set all width values to a multiple of 16

VXLIB_thresholdRange_i8u_o8u_checkParams()

VXLIB_STATUS VXLIB_thresholdRange_i8u_o8u_checkParams	(	const uint8_t	src[],
		const VXLIB_bufParams2D_t *	src_addr,
		const uint8_t	dst[],
		const VXLIB_bufParams2D_t *	dst_addr,
		uint8_t	upper,
		uint8_t	lower
	)

Description:

Checks the parameters for programming errors for the VXLIB_thresholdBinary_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
• The upper threshold shall not be less than the lower threshold

Parameters

[in]	src[]	Pointer to array containing first input image (UQ8.0)
[in]	src_addr[]	Pointer to structure containing dimensional information of src
[out]	dst[]	Pointer to array containing output image (UQ8.0)
[in]	dst_addr[]	Pointer to structure containing dimensional information of dst
[in]	upper	Parameter indicating upper threshold value
[in]	lower	Parameter indicating lower threshold value