mstencils.c File Reference

Mosaiced contour stencils. More...

#include <math.h>

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Macros
#define	TVEDGE(x1, y1, x2, y2)
	Compute the absolute difference between (x1,y1) and (x2,y2) More...
#define	NUMSTENCILS   8
	Number of contour stencils. More...
#define	NEIGHRADIUS   2
	Radius of the stencil neighborhood. More...
#define	WEIGHT_AXIAL   4.545454545454546e-02
#define	WEIGHT_PI_8   1.181325147609750e-02
#define	WEIGHT_GREEN_MU   1.111167799007432e+00
#define	WEIGHT_GREEN_DIAGONAL   5.050762722761053e-02
#define	WEIGHT_REDBLUE_MU   1.111167799007432e+00
#define	WEIGHT_REDBLUE_DIAGONAL   5.050762722761053e-02

Functions
void	FitMosaicedStencils (int *Stencil, const float *Input, int Width, int Height, int RedX, int RedY)
	Estimate the contour orientations of a mosaiced image. More...

Detailed Description

Mosaiced contour stencils.

Author

Pascal Getreuer getre.nosp@m.uer@.nosp@m.gmail.nosp@m..com

Definition in file mstencils.c.

Macro Definition Documentation

#define NEIGHRADIUS   2

Radius of the stencil neighborhood.

Definition at line 20 of file mstencils.c.

#define NUMSTENCILS   8

Number of contour stencils.

Definition at line 17 of file mstencils.c.

#define TVEDGE	(		x1,
			y1,
			x2,
			y2
	)

Value:

fabs(Input[HorizontalOffset[x1] + VerticalOffset[y1]] \
    - Input[HorizontalOffset[x2] + VerticalOffset[y2]])

Compute the absolute difference between (x1,y1) and (x2,y2)

Definition at line 12 of file mstencils.c.

#define WEIGHT_AXIAL   4.545454545454546e-02

Definition at line 23 of file mstencils.c.

#define WEIGHT_GREEN_DIAGONAL   5.050762722761053e-02

Definition at line 26 of file mstencils.c.

#define WEIGHT_GREEN_MU   1.111167799007432e+00

Definition at line 25 of file mstencils.c.

#define WEIGHT_PI_8   1.181325147609750e-02

Definition at line 24 of file mstencils.c.

#define WEIGHT_REDBLUE_DIAGONAL   5.050762722761053e-02

Definition at line 28 of file mstencils.c.

#define WEIGHT_REDBLUE_MU   1.111167799007432e+00

Definition at line 27 of file mstencils.c.

Function Documentation

void FitMosaicedStencils	(	int *	Stencil,
		const float *	Input,
		int	Width,
		int	Height,
		int	RedX,
		int	RedY
	)

Estimate the contour orientations of a mosaiced image.

Parameters

Stencil	array to store the selected stencils
Input	the mosaiced image
Width,Height	dimensions of the image
RedX,RedY	the coordinates of the upper-leftmost red pixel

Mosaiced contour stencils are applied to estimate the contour orientation at each pixel. The output array Stencil holds the index of the selected stencil at each point. The orientation estimate at the ith pixel is Stencil[i]*M_PI/8 radians:

       5  4  3
     6,   |   ,2
    7  `, | ,`  1
    0-----+-----0
Orientations described
    by Stencil[i]

The same enumeration of orientations is used internally for the TV array.

Definition at line 51 of file mstencils.c.

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