Quantization Functions

Typedefs
typedef struct NppiDCTState	NppiDCTState

Functions
NppStatus	nppiQuantFwdRawTableInit_JPEG_8u (Npp8u *hpQuantRawTable, int nQualityFactor)
	Apply quality factor to raw 8-bit quantization table. More...
NppStatus	nppiQuantFwdTableInit_JPEG_8u16u (const Npp8u *hpQuantRawTable, Npp16u *hpQuantFwdRawTable)
	Initializes a quantization table for nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R(). More...
NppStatus	nppiQuantInvTableInit_JPEG_8u16u (const Npp8u *hpQuantRawTable, Npp16u *hpQuantFwdRawTable)
	Initializes a quantization table for nppiDCTQuantInv8x8LS_JPEG_16s8u_C1R(). More...
NppStatus	nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R (const Npp8u *pSrc, int nSrcStep, Npp16s *pDst, int nDstStep, const Npp16u *pQuantFwdTable, NppiSize oSizeROI)
	Forward DCT, quantization and level shift part of the JPEG encoding. More...
NppStatus	nppiDCTQuantInv8x8LS_JPEG_16s8u_C1R (const Npp16s *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, const Npp16u *pQuantInvTable, NppiSize oSizeROI)
	Inverse DCT, de-quantization and level shift part of the JPEG decoding. More...
NppStatus	nppiDCTInitAlloc (NppiDCTState **ppState)
	Initializes DCT state structure and allocates additional resources. More...
NppStatus	nppiDCTFree (NppiDCTState *pState)
	Frees the additional resources of the DCT state structure. More...
NppStatus	nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R_NEW (const Npp8u *pSrc, int nSrcStep, Npp16s *pDst, int nDstStep, const Npp8u *pQuantizationTable, NppiSize oSizeROI, NppiDCTState *pState)
	Forward DCT, quantization and level shift part of the JPEG encoding. More...
NppStatus	nppiDCTQuantInv8x8LS_JPEG_16s8u_C1R_NEW (const Npp16s *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, const Npp8u *pQuantizationTable, NppiSize oSizeROI, NppiDCTState *pState)
	Inverse DCT, de-quantization and level shift part of the JPEG decoding. More...
NppStatus	nppiDCTQuant16Fwd8x8LS_JPEG_8u16s_C1R_NEW (const Npp8u *pSrc, int nSrcStep, Npp16s *pDst, int nDstStep, const Npp16u *pQuantizationTable, NppiSize oSizeROI, NppiDCTState *pState)
	Forward DCT, quantization and level shift part of the JPEG encoding, 16-bit short integer. More...
NppStatus	nppiDCTQuant16Inv8x8LS_JPEG_16s8u_C1R_NEW (const Npp16s *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, const Npp16u *pQuantizationTable, NppiSize oSizeROI, NppiDCTState *pState)
	Inverse DCT, de-quantization and level shift part of the JPEG decoding, 16-bit short integer. More...

Detailed Description

Typedef Documentation

typedef struct NppiDCTState NppiDCTState

Function Documentation

NppStatus nppiDCTFree

(

NppiDCTState *

pState

)

Frees the additional resources of the DCT state structure.

See Also

nppiDCTInitAlloc

Parameters

pState

Pointer to DCT state structure.

Returns

NPP_SUCCESS Indicates no error. Any other value indicates an error or a warning

NPP_SIZE_ERROR Indicates an error condition if any image dimension has zero or negative value

NPP_NULL_POINTER_ERROR Indicates an error condition if pState pointer is NULL

NppStatus nppiDCTInitAlloc

(

NppiDCTState **

ppState

)

Initializes DCT state structure and allocates additional resources.

See Also

nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R_NEW(), nppiDCTQuantInv8x8LS_JPEG_16s8u_C1R_NEW.

Parameters

ppState

Pointer to pointer to DCT state structure.

Returns

NPP_SUCCESS Indicates no error. Any other value indicates an error or a warning

NPP_SIZE_ERROR Indicates an error condition if any image dimension has zero or negative value

NPP_NULL_POINTER_ERROR Indicates an error condition if pBufSize pointer is NULL

NppStatus nppiDCTQuant16Fwd8x8LS_JPEG_8u16s_C1R_NEW	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp16s *	pDst,
		int	nDstStep,
		const Npp16u *	pQuantizationTable,
		NppiSize	oSizeROI,
		NppiDCTState *	pState
	)

Forward DCT, quantization and level shift part of the JPEG encoding, 16-bit short integer.

Input is expected in 8x8 macro blocks and output is expected to be in 64x1 macro blocks. The new version of the primitive takes the ROI in image pixel size and works with DCT coefficients that are in zig-zag order.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Source-Image Line Step.
pDst	Destination-Image Pointer.
nDstStep	Image width in pixels x 8 x sizeof(Npp16s).
pQuantizationTable	Quantization Table in zig-zag order.
oSizeROI	Region-of-Interest (ROI).
pState	Pointer to DCT state structure. This structure must be initialized allocated and initialized using nppiDCTInitAlloc().

Returns

Error codes:

• NPP_SIZE_ERROR For negative input height/width or not a multiple of 8 width/height.
• NPP_STEP_ERROR If input image width is not multiple of 8 or does not match ROI.
• NPP_NULL_POINTER_ERROR If the destination pointer is 0.

NppStatus nppiDCTQuant16Inv8x8LS_JPEG_16s8u_C1R_NEW	(	const Npp16s *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		const Npp16u *	pQuantizationTable,
		NppiSize	oSizeROI,
		NppiDCTState *	pState
	)

Inverse DCT, de-quantization and level shift part of the JPEG decoding, 16-bit short integer.

Input is expected in 64x1 macro blocks and output is expected to be in 8x8 macro blocks. The new version of the primitive takes the ROI in image pixel size and works with DCT coefficients that are in zig-zag order.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Image width in pixels x 8 x sizeof(Npp16s).
pDst	Destination-Image Pointer.
nDstStep	Destination-Image Line Step.
pQuantizationTable	Quantization Table in zig-zag order.
oSizeROI	Region-of-Interest (ROI).
pState	Pointer to DCT state structure. This structure must be initialized allocated and initialized using nppiDCTInitAlloc().

Returns

Error codes:

• NPP_SIZE_ERROR For negative input height/width or not a multiple of 8 width/height.
• NPP_STEP_ERROR If input image width is not multiple of 8 or does not match ROI.
• NPP_NULL_POINTER_ERROR If the destination pointer is 0.

NppStatus nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp16s *	pDst,
		int	nDstStep,
		const Npp16u *	pQuantFwdTable,
		NppiSize	oSizeROI
	)

Forward DCT, quantization and level shift part of the JPEG encoding.

Input is expected in 8x8 macro blocks and output is expected to be in 64x1 macro blocks.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Source-Image Line Step.
pDst	Destination-Image Pointer.
nDstStep	Destination-Image Line Step.
pQuantFwdTable	Forward quantization tables for JPEG encoding created using nppiQuantInvTableInit_JPEG_8u16u().
oSizeROI	Region-of-Interest (ROI).

Returns

Error codes:

• NPP_SIZE_ERROR For negative input height/width or not a multiple of 8 width/height.
• NPP_STEP_ERROR If input image width is not multiple of 8 or does not match ROI.
• NPP_NULL_POINTER_ERROR If the destination pointer is 0.

NppStatus nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R_NEW	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp16s *	pDst,
		int	nDstStep,
		const Npp8u *	pQuantizationTable,
		NppiSize	oSizeROI,
		NppiDCTState *	pState
	)

Forward DCT, quantization and level shift part of the JPEG encoding.

Input is expected in 8x8 macro blocks and output is expected to be in 64x1 macro blocks. The new version of the primitive takes the ROI in image pixel size and works with DCT coefficients that are in zig-zag order.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Source-Image Line Step.
pDst	Destination-Image Pointer.
nDstStep	Image width in pixels x 8 x sizeof(Npp16s).
pQuantizationTable	Quantization Table in zig-zag order.
oSizeROI	Region-of-Interest (ROI).
pState	Pointer to DCT state structure. This structure must be initialized allocated and initialized using nppiDCTInitAlloc().

Returns

Error codes:

• NPP_SIZE_ERROR For negative input height/width or not a multiple of 8 width/height.
• NPP_STEP_ERROR If input image width is not multiple of 8 or does not match ROI.
• NPP_NULL_POINTER_ERROR If the destination pointer is 0.

NppStatus nppiDCTQuantInv8x8LS_JPEG_16s8u_C1R	(	const Npp16s *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		const Npp16u *	pQuantInvTable,
		NppiSize	oSizeROI
	)

Inverse DCT, de-quantization and level shift part of the JPEG decoding.

Input is expected in 64x1 macro blocks and output is expected to be in 8x8 macro blocks.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Image width in pixels x 8 x sizeof(Npp16s).
pDst	Destination-Image Pointer.
nDstStep	Image width in pixels x 8 x sizeof(Npp16s).
pQuantInvTable	Inverse quantization tables for JPEG decoding created using nppiQuantInvTableInit_JPEG_8u16u().
oSizeROI	Region-of-Interest (ROI).

Returns

Error codes:

• NPP_SIZE_ERROR For negative input height/width or not a multiple of 8 width/height.
• NPP_STEP_ERROR If input image width is not multiple of 8 or does not match ROI.
• NPP_NULL_POINTER_ERROR If the destination pointer is 0.

NppStatus nppiDCTQuantInv8x8LS_JPEG_16s8u_C1R_NEW	(	const Npp16s *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		const Npp8u *	pQuantizationTable,
		NppiSize	oSizeROI,
		NppiDCTState *	pState
	)

Inverse DCT, de-quantization and level shift part of the JPEG decoding.

Input is expected in 64x1 macro blocks and output is expected to be in 8x8 macro blocks. The new version of the primitive takes the ROI in image pixel size and works with DCT coefficients that are in zig-zag order.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Image width in pixels x 8 x sizeof(Npp16s).
pDst	Destination-Image Pointer.
nDstStep	Destination-Image Line Step.
pQuantizationTable	Quantization Table in zig-zag order.
oSizeROI	Region-of-Interest (ROI).
pState	Pointer to DCT state structure. This structure must be initialized allocated and initialized using nppiDCTInitAlloc().

Returns

Error codes:

• NPP_SIZE_ERROR For negative input height/width or not a multiple of 8 width/height.
• NPP_STEP_ERROR If input image width is not multiple of 8 or does not match ROI.
• NPP_NULL_POINTER_ERROR If the destination pointer is 0.

NppStatus nppiQuantFwdRawTableInit_JPEG_8u	(	Npp8u *	hpQuantRawTable,
		int	nQualityFactor
	)

Apply quality factor to raw 8-bit quantization table.

This is effectively and in-place method that modifies a given raw quantization table based on a quality factor. Note that this method is a host method and that the pointer to the raw quantization table is a host pointer.

Parameters

hpQuantRawTable	Raw quantization table.
nQualityFactor	Quality factor for the table. Range is [1:100].

Returns

Error code: NPP_NULL_POINTER_ERROR is returned if hpQuantRawTable is 0.

NppStatus nppiQuantFwdTableInit_JPEG_8u16u	(	const Npp8u *	hpQuantRawTable,
		Npp16u *	hpQuantFwdRawTable
	)

Initializes a quantization table for nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R().

The method creates a 16-bit version of the raw table and converts the data order from zigzag layout to original row-order layout since raw quantization tables are typically stored in zigzag format.

This method is a host method. It consumes and produces host data. I.e. the pointers passed to this function must be host pointers. The resulting table needs to be transferred to device memory in order to be used with nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R() function.

Parameters

hpQuantRawTable	Host pointer to raw quantization table as returned by nppiQuantFwdRawTableInit_JPEG_8u(). The raw quantization table is assumed to be in zigzag order.
hpQuantFwdRawTable	Forward quantization table for use with nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R().

Returns

Error code: NPP_NULL_POINTER_ERROR pQuantRawTable is 0.

NppStatus nppiQuantInvTableInit_JPEG_8u16u	(	const Npp8u *	hpQuantRawTable,
		Npp16u *	hpQuantFwdRawTable
	)

Initializes a quantization table for nppiDCTQuantInv8x8LS_JPEG_16s8u_C1R().

 The nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R() method uses a quantization table

in a 16-bit format allowing for faster processing. In addition it converts the data order from zigzag layout to original row-order layout. Typically raw quantization tables are stored in zigzag format.

This method is a host method and consumes and produces host data. I.e. the pointers passed to this function must be host pointers. The resulting table needs to be transferred to device memory in order to be used with nppiDCTQuantFwd8x8LS_JPEG_8u16s_C1R() function.

Parameters

hpQuantRawTable	Raw quantization table.
hpQuantFwdRawTable	Inverse quantization table.

Returns

NPP_NULL_POINTER_ERROR pQuantRawTable or pQuantFwdRawTable is0.