dwt.h File Reference

Implementation of a discrete wavelet transform (DWT) More...

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Functions
Exported functions
OPJ_BOOL	opj_dwt_encode (opj_tcd_t *p_tcd, opj_tcd_tilecomp_t *tilec)
	Forward 5-3 wavelet transform in 2-D. More...
OPJ_BOOL	opj_dwt_decode (opj_tcd_t *p_tcd, opj_tcd_tilecomp_t *tilec, OPJ_UINT32 numres)
	Inverse 5-3 wavelet transform in 2-D. More...
OPJ_FLOAT64	opj_dwt_getnorm (OPJ_UINT32 level, OPJ_UINT32 orient)
	Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT. More...
OPJ_BOOL	opj_dwt_encode_real (opj_tcd_t *p_tcd, opj_tcd_tilecomp_t *tilec)
	Forward 9-7 wavelet transform in 2-D. More...
OPJ_BOOL	opj_dwt_decode_real (opj_tcd_t *p_tcd, opj_tcd_tilecomp_t *OPJ_RESTRICT tilec, OPJ_UINT32 numres)
	Inverse 9-7 wavelet transform in 2-D. More...
OPJ_FLOAT64	opj_dwt_getnorm_real (OPJ_UINT32 level, OPJ_UINT32 orient)
	Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT. More...
void	opj_dwt_calc_explicit_stepsizes (opj_tccp_t *tccp, OPJ_UINT32 prec)
	Explicit calculation of the Quantization Stepsizes. More...

Detailed Description

Implementation of a discrete wavelet transform (DWT)

The functions in DWT.C have for goal to realize forward and inverse discret wavelet transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in DWT.C are used by some function in TCD.C.

Function Documentation

opj_dwt_calc_explicit_stepsizes()

void opj_dwt_calc_explicit_stepsizes	(	opj_tccp_t *	tccp,
		OPJ_UINT32	prec
	)

Explicit calculation of the Quantization Stepsizes.

Parameters

tccp	Tile-component coding parameters
prec	Precint analyzed

References J2K_CCP_QNTSTY_NOQNT, opj_tccp::numresolutions, opj_dwt_encode_stepsize(), opj_dwt_getnorm_real(), opj_tccp::qmfbid, opj_tccp::qntsty, and opj_tccp::stepsizes.

Referenced by opj_j2k_setup_encoder().

opj_dwt_decode()

OPJ_BOOL opj_dwt_decode	(	opj_tcd_t *	p_tcd,
		opj_tcd_tilecomp_t *	tilec,
		OPJ_UINT32	numres
	)

Inverse 5-3 wavelet transform in 2-D.

Apply a reversible inverse DWT transform to a component of an image.

Parameters

p_tcd	TCD handle
tilec	Tile component information (current tile)
numres	Number of resolution levels to decode

References opj_dwt_decode_partial_tile(), opj_dwt_decode_tile(), opj_tcd::thread_pool, and opj_tcd::whole_tile_decoding.

Referenced by main(), and opj_tcd_dwt_decode().

opj_dwt_decode_real()

OPJ_BOOL opj_dwt_decode_real	(	opj_tcd_t *	p_tcd,
		opj_tcd_tilecomp_t *OPJ_RESTRICT	tilec,
		OPJ_UINT32	numres
	)

Inverse 9-7 wavelet transform in 2-D.

Apply an irreversible inverse DWT transform to a component of an image.

Parameters

p_tcd	TCD handle
tilec	Tile component information (current tile)
numres	Number of resolution levels to decode

References opj_dwt_decode_partial_97(), opj_dwt_decode_tile_97(), opj_tcd::thread_pool, and opj_tcd::whole_tile_decoding.

Referenced by main(), and opj_tcd_dwt_decode().

opj_dwt_encode()

OPJ_BOOL opj_dwt_encode	(	opj_tcd_t *	p_tcd,
		opj_tcd_tilecomp_t *	tilec
	)

Forward 5-3 wavelet transform in 2-D.

Apply a reversible DWT transform to a component of an image.

Parameters

p_tcd	TCD handle
tilec	Tile component information (current tile)

References opj_dwt_encode_and_deinterleave_h_one_row(), opj_dwt_encode_and_deinterleave_v(), opj_dwt_encode_procedure(), and opj_tcd::thread_pool.

Referenced by main(), and opj_tcd_dwt_encode().

opj_dwt_encode_real()

OPJ_BOOL opj_dwt_encode_real	(	opj_tcd_t *	p_tcd,
		opj_tcd_tilecomp_t *	tilec
	)

Forward 9-7 wavelet transform in 2-D.

Apply an irreversible DWT transform to a component of an image.

Parameters

p_tcd	TCD handle
tilec	Tile component information (current tile)

References opj_dwt_encode_and_deinterleave_h_one_row_real(), opj_dwt_encode_and_deinterleave_v_real(), opj_dwt_encode_procedure(), and opj_tcd::thread_pool.

Referenced by main(), and opj_tcd_dwt_encode().

opj_dwt_getnorm()

OPJ_FLOAT64 opj_dwt_getnorm	(	OPJ_UINT32	level,
		OPJ_UINT32	orient
	)

Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.

Parameters

level	Level of the wavelet function
orient	Band of the wavelet function

Returns

Returns the norm of the wavelet function

References opj_dwt_norms.

Referenced by opj_t1_getwmsedec().

opj_dwt_getnorm_real()

OPJ_FLOAT64 opj_dwt_getnorm_real	(	OPJ_UINT32	level,
		OPJ_UINT32	orient
	)

Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT.

Parameters

level	Level of the wavelet function
orient	Band of the wavelet function

Returns

Returns the norm of the 9-7 wavelet

References opj_dwt_norms_real.

Referenced by opj_dwt_calc_explicit_stepsizes(), and opj_t1_getwmsedec().