img_dist_ms_ssim.c File Reference

Compute structural similarity (SSIM) index using the encoded image and the reference image. More...

#include "contributors.h"
#include "global.h"
#include "img_distortion.h"
#include "enc_statistics.h"
#include "memalloc.h"
#include "math.h"

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Defines

#define UNBIASED_VARIANCE

#define MS_SSIM_PAD   6

#define MS_SSIM_PAD2   3

#define MS_SSIM_BETA0   0.0448

#define MS_SSIM_BETA1   0.2856

#define MS_SSIM_BETA2   0.3001

#define MS_SSIM_BETA3   0.2363

#define MS_SSIM_BETA4   0.1333

#define MAX_SSIM_LEVELS   5

Functions

float compute_structural_components (ImageParameters *p_Img, InputParameters *p_Inp, imgpel **refImg, imgpel **encImg, int height, int width, int win_height, int win_width, int comp)

float compute_luminance_component (ImageParameters *p_Img, InputParameters *p_Inp, imgpel **refImg, imgpel **encImg, int height, int width, int win_height, int win_width, int comp)

void horizontal_symmetric_extension (int **buffer, int width, int height)

void vertical_symmetric_extension (int **buffer, int width, int height)

static void imgpel_to_padded_int (imgpel **src, int **buffer, int width, int height)

void downsample (imgpel **src, imgpel **out, int height, int width)

float compute_ms_ssim (ImageParameters *p_Img, InputParameters *p_Inp, imgpel **refImg, imgpel **encImg, int height, int width, int win_height, int win_width, int comp)

void find_ms_ssim (ImageParameters *p_Img, InputParameters *p_Inp, ImageStructure *ref, ImageStructure *src, DistMetric *metricSSIM)

Detailed Description

Compute structural similarity (SSIM) index using the encoded image and the reference image.

Author:

Main contributors (see contributors.h for copyright, address and affiliation details)

Woo-Shik Kim <wooshik.kim@usc.edu>
Peshala Pahalawatta <ppaha@dolby.com>
Zhen Li <zli@dolby.com>
Alexis Michael Tourapis <alexismt@ieee.org>

Definition in file img_dist_ms_ssim.c.

Function Documentation

void find_ms_ssim	(	ImageParameters *	p_Img,
		InputParameters *	p_Inp,
		ImageStructure *	ref,
		ImageStructure *	src,
		DistMetric *	metricSSIM
	)

Find MS-SSIM for all three components.

Definition at line 332 of file img_dist_ms_ssim.c.

References accumulate_average(), accumulate_avslice(), distortion_metric::value, and YUV400.

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Defines
#define	UNBIASED_VARIANCE
#define	MS_SSIM_PAD 6
#define	MS_SSIM_PAD2 3
#define	MS_SSIM_BETA0 0.0448
#define	MS_SSIM_BETA1 0.2856
#define	MS_SSIM_BETA2 0.3001
#define	MS_SSIM_BETA3 0.2363
#define	MS_SSIM_BETA4 0.1333
#define	MAX_SSIM_LEVELS 5
Functions
float	compute_structural_components (ImageParameters p_Img, InputParameters p_Inp, imgpel refImg, imgpel encImg, int height, int width, int win_height, int win_width, int comp)
float	compute_luminance_component (ImageParameters p_Img, InputParameters p_Inp, imgpel refImg, imgpel encImg, int height, int width, int win_height, int win_width, int comp)
void	horizontal_symmetric_extension (int **buffer, int width, int height)
void	vertical_symmetric_extension (int **buffer, int width, int height)
static void	imgpel_to_padded_int (imgpel src, int buffer, int width, int height)
void	downsample (imgpel src, imgpel out, int height, int width)
float	compute_ms_ssim (ImageParameters p_Img, InputParameters p_Inp, imgpel refImg, imgpel encImg, int height, int width, int win_height, int win_width, int comp)
void	find_ms_ssim (ImageParameters p_Img, InputParameters p_Inp, ImageStructure ref, ImageStructure src, DistMetric *metricSSIM)