transform.c File Reference

Matrix transform. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "jabcode.h"
#include "detector.h"

Functions
jab_perspective_transform *	square2Quad (jab_float x0, jab_float y0, jab_float x1, jab_float y1, jab_float x2, jab_float y2, jab_float x3, jab_float y3)
	Calculate transformation matrix of square to quadrilateral. More...
jab_perspective_transform *	quad2Square (jab_float x0, jab_float y0, jab_float x1, jab_float y1, jab_float x2, jab_float y2, jab_float x3, jab_float y3)
	Calculate transformation matrix of quadrilateral to square. More...
jab_perspective_transform *	multiply (jab_perspective_transform *m1, jab_perspective_transform *m2)
	Calculate matrix multiplication. More...
jab_perspective_transform *	perspectiveTransform (jab_float x0, jab_float y0, jab_float x1, jab_float y1, jab_float x2, jab_float y2, jab_float x3, jab_float y3, jab_float x0p, jab_float y0p, jab_float x1p, jab_float y1p, jab_float x2p, jab_float y2p, jab_float x3p, jab_float y3p)
	Calculate transformation matrix of quadrilateral to quadrilateral. More...
jab_perspective_transform *	getPerspectiveTransform (jab_point p0, jab_point p1, jab_point p2, jab_point p3, jab_vector2d side_size)
	Get perspetive transformation matrix. More...
void	warpPoints (jab_perspective_transform *pt, jab_point *points, jab_int32 length)
	Warp points from source image to destination image in place. More...

Detailed Description

Matrix transform.

libjabcode - JABCode Encoding/Decoding Library

Copyright 2016 by Fraunhofer SIT. All rights reserved. See LICENSE file for full terms of use and distribution.

Contact: Huajian Liu liu@s.nosp@m.it.f.nosp@m.raunh.nosp@m.ofer.nosp@m..de Waldemar Berchtold walde.nosp@m.mar..nosp@m.berch.nosp@m.told.nosp@m.@sit..nosp@m.frau.nosp@m.nhofe.nosp@m.r.de

Function Documentation

jab_perspective_transform* getPerspectiveTransform	(	jab_point	p0,
		jab_point	p1,
		jab_point	p2,
		jab_point	p3,
		jab_vector2d	side_size
	)

Get perspetive transformation matrix.

Parameters

p0	the coordinate of the 1st finder/alignment pattern
p1	the coordinate of the 2nd finder/alignment pattern
p2	the coordinate of the 3rd finder/alignment pattern
p3	the coordinate of the 4th finder/alignment pattern
side_size	the side size of the symbol

Returns

the transformation matrix

jab_perspective_transform* multiply	(	jab_perspective_transform *	m1,
		jab_perspective_transform *	m2
	)

Calculate matrix multiplication.

Parameters

m1	the multiplicand
m2	the multiplier

Returns

m1 x m2

jab_perspective_transform* perspectiveTransform	(	jab_float	x0,
		jab_float	y0,
		jab_float	x1,
		jab_float	y1,
		jab_float	x2,
		jab_float	y2,
		jab_float	x3,
		jab_float	y3,
		jab_float	x0p,
		jab_float	y0p,
		jab_float	x1p,
		jab_float	y1p,
		jab_float	x2p,
		jab_float	y2p,
		jab_float	x3p,
		jab_float	y3p
	)

Calculate transformation matrix of quadrilateral to quadrilateral.

Parameters

x0	the x coordinate of the 1st source point
y0	the y coordinate of the 1st source point
x1	the x coordinate of the 2nd source point
y1	the y coordinate of the 2nd source point
x2	the x coordinate of the 3rd source point
y2	the y coordinate of the 3rd source point
x3	the x coordinate of the 4th source point
y3	the y coordinate of the 4th source point
x0p	the x coordinate of the 1st destination point
y0p	the y coordinate of the 1st destination point
x1p	the x coordinate of the 2nd destination point
y1p	the y coordinate of the 2nd destination point
x2p	the x coordinate of the 3rd destination point
y2p	the y coordinate of the 3rd destination point
x3p	the x coordinate of the 4th destination point
y3p	the y coordinate of the 4th destination point

Returns

the transformation matrix

jab_perspective_transform* quad2Square	(	jab_float	x0,
		jab_float	y0,
		jab_float	x1,
		jab_float	y1,
		jab_float	x2,
		jab_float	y2,
		jab_float	x3,
		jab_float	y3
	)

Calculate transformation matrix of quadrilateral to square.

Parameters

x0	the x coordinate of the 1st source point
y0	the y coordinate of the 1st source point
x1	the x coordinate of the 2nd source point
y1	the y coordinate of the 2nd source point
x2	the x coordinate of the 3rd source point
y2	the y coordinate of the 3rd source point
x3	the x coordinate of the 4th source point
y3	the y coordinate of the 4th source point

Returns

the transformation matrix

jab_perspective_transform* square2Quad	(	jab_float	x0,
		jab_float	y0,
		jab_float	x1,
		jab_float	y1,
		jab_float	x2,
		jab_float	y2,
		jab_float	x3,
		jab_float	y3
	)

Calculate transformation matrix of square to quadrilateral.

Parameters

x0	the x coordinate of the 1st destination point
y0	the y coordinate of the 1st destination point
x1	the x coordinate of the 2nd destination point
y1	the y coordinate of the 2nd destination point
x2	the x coordinate of the 3rd destination point
y2	the y coordinate of the 3rd destination point
x3	the x coordinate of the 4th destination point
y3	the y coordinate of the 4th destination point

Returns

the transformation matrix

void warpPoints	(	jab_perspective_transform *	pt,
		jab_point *	points,
		jab_int32	length
	)

Warp points from source image to destination image in place.

Parameters

pt	the transformation matrix
points	the source points
length	the number of source points