wavelet97.c File Reference

#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "wavelet97.h"

Go to the source code of this file.

Functions
static void	decompose (float *dst_l, float *dst_h, const float *src, const double coeff[2][5], int linesize, int w)
static void	compose (float *dst, const float *src_l, const float *src_h, int linesize, int w)
static void	decompose_decimated (float *dst, const float *src, const double coeff[2][5], int stride, int n)
static void	compose_decimated (float *dst, const float *src, int stride, int n)
void	ff_wavelet97_decompose_lines (float *dst_l, float *dst_h, const float *src, const double coeff[2][5], int xlinesize, int ylinesize, int step, int w, int line0, int line1)
	Undecimated analysis of lines line0..line1-1 along one direction.
void	ff_wavelet97_compose_lines (float *dst, const float *src_l, const float *src_h, int xlinesize, int ylinesize, int step, int w, int line0, int line1)
	Inverse of ff_wavelet97_decompose_lines() with ff_wavelet97_coeff.
void	ff_wavelet97_decompose_decimated_lines (float *dst, const float *src, const double coeff[2][5], int xstride, int ystride, int len, int line0, int line1)
	Decimated analysis of lines line0..line1-1 along one direction.
void	ff_wavelet97_compose_decimated_lines (float *dst, const float *src, int xstride, int ystride, int len, int line0, int line1)
	Inverse of ff_wavelet97_decompose_decimated_lines() with ff_wavelet97_coeff.
void	ff_wavelet97_decompose (float *dst[4], const float *src, float *temp[2], const double coeff[2][5], int linesize, int step, int w, int h)
	One level of undecimated 2D analysis, filters are mirrored at the plane borders.
void	ff_wavelet97_compose (float *dst, float *const src[4], float *temp[2], int linesize, int step, int w, int h)
	One level of 2D synthesis, the inverse of ff_wavelet97_decompose() with ff_wavelet97_coeff.

Variables
const double	ff_wavelet97_coeff [2][5]
	Undecimated 9/7 wavelet transform.
static const double	icoeff [2][5]

Function Documentation

decompose()

static void decompose ( float * dst_l, float * dst_h, const float * src, const double coeff[2][5], int linesize, int w )

inlinestatic

Definition at line 56 of file wavelet97.c.

Referenced by ff_wavelet97_decompose_lines().

compose()

static void compose ( float * dst, const float * src_l, const float * src_h, int linesize, int w )

inlinestatic

Definition at line 75 of file wavelet97.c.

Referenced by ff_wavelet97_compose_lines().

decompose_decimated()

static void decompose_decimated ( float * dst, const float * src, const double coeff[2][5], int stride, int n )

inlinestatic

Definition at line 93 of file wavelet97.c.

Referenced by ff_wavelet97_decompose_decimated_lines().

compose_decimated()

static void compose_decimated ( float * dst, const float * src, int stride, int n )

inlinestatic

Definition at line 107 of file wavelet97.c.

Referenced by ff_wavelet97_compose_decimated_lines().

ff_wavelet97_decompose_lines()

void ff_wavelet97_decompose_lines	(	float *	dst_l,
		float *	dst_h,
		const float *	src,
		const double	coeff[2][5],
		int	xlinesize,
		int	ylinesize,
		int	step,
		int	w,
		int	line0,
		int	line1 )

Undecimated analysis of lines line0..line1-1 along one direction.

Line y, sample x is at src[y * ylinesize + x * xlinesize], x < w, w >= 2.

Parameters

dst_l	lowpass output, same layout as src
dst_h	highpass output, same layout as src
coeff	lowpass and highpass filters, normally ff_wavelet97_coeff
step	dilation of the filters, 1 << level

Definition at line 120 of file wavelet97.c.

Referenced by ff_wavelet97_decompose(), and run_pass_slice().

ff_wavelet97_compose_lines()

void ff_wavelet97_compose_lines	(	float *	dst,
		const float *	src_l,
		const float *	src_h,
		int	xlinesize,
		int	ylinesize,
		int	step,
		int	w,
		int	line0,
		int	line1 )

Inverse of ff_wavelet97_decompose_lines() with ff_wavelet97_coeff.

Definition at line 134 of file wavelet97.c.

Referenced by ff_wavelet97_compose(), and run_pass_slice().

ff_wavelet97_decompose_decimated_lines()

void ff_wavelet97_decompose_decimated_lines	(	float *	dst,
		const float *	src,
		const double	coeff[2][5],
		int	xstride,
		int	ystride,
		int	len,
		int	line0,
		int	line1 )

Decimated analysis of lines line0..line1-1 along one direction.

Line y, sample x is at src[y * ystride + x * xstride], x < len, len >= 2. Lowpass coefficients are written to even, highpass ones to odd x of dst.

Parameters

coeff

lowpass and highpass filters, normally ff_wavelet97_coeff

Definition at line 147 of file wavelet97.c.

Referenced by run_pass_slice().

ff_wavelet97_compose_decimated_lines()

void ff_wavelet97_compose_decimated_lines	(	float *	dst,
		const float *	src,
		int	xstride,
		int	ystride,
		int	len,
		int	line0,
		int	line1 )

Inverse of ff_wavelet97_decompose_decimated_lines() with ff_wavelet97_coeff.

Definition at line 156 of file wavelet97.c.

Referenced by run_pass_slice().

ff_wavelet97_decompose()

void ff_wavelet97_decompose	(	float *	dst[4],
		const float *	src,
		float *	temp[2],
		const double	coeff[2][5],
		int	linesize,
		int	step,
		int	w,
		int	h )

One level of undecimated 2D analysis, filters are mirrored at the plane borders.

Parameters

dst	output bands LL, LH, HL, HH (horizontal/vertical filter)
src	input plane
temp	two scratch planes
coeff	lowpass and highpass filters, normally ff_wavelet97_coeff
linesize	distance between lines in floats, same for all planes
step	dilation of the filters, 1 << level

Definition at line 164 of file wavelet97.c.

Referenced by filter().

ff_wavelet97_compose()

void ff_wavelet97_compose	(	float *	dst,
		float *const	src[4],
		float *	temp[2],
		int	linesize,
		int	step,
		int	w,
		int	h )

One level of 2D synthesis, the inverse of ff_wavelet97_decompose() with ff_wavelet97_coeff.

Definition at line 173 of file wavelet97.c.

Referenced by filter().

Variable Documentation

ff_wavelet97_coeff

const double ff_wavelet97_coeff[2][5]

Initial value:

= {
    {
         0.6029490182363579  * M_SQRT2,
         0.2668641184428723  * M_SQRT2,
        -0.07822326652898785 * M_SQRT2,
        -0.01686411844287495 * M_SQRT2,
         0.02674875741080976 * M_SQRT2,
    },{
         1.115087052456994   / M_SQRT2,
        -0.5912717631142470  / M_SQRT2,
        -0.05754352622849957 / M_SQRT2,
         0.09127176311424948 / M_SQRT2,
    }
}

Undecimated 9/7 wavelet transform.

Analysis lowpass and highpass filters, both symmetric around tap 0

Definition at line 26 of file wavelet97.c.

Referenced by filter(), init(), transform_decimated(), and transform_undecimated().

icoeff

const double icoeff[2][5]

static

Initial value:

= {
    {
         1.115087052456994   / M_SQRT2,
         0.5912717631142470  / M_SQRT2,
        -0.05754352622849957 / M_SQRT2,
        -0.09127176311424948 / M_SQRT2,
    },{
         0.6029490182363579  * M_SQRT2,
        -0.2668641184428723  * M_SQRT2,
        -0.07822326652898785 * M_SQRT2,
         0.01686411844287495 * M_SQRT2,
         0.02674875741080976 * M_SQRT2,
    }
}

Definition at line 41 of file wavelet97.c.

Referenced by colormap_slice(), compose(), and compose_decimated().