Kifu: Go game record (kifu) generator: Difference between revisions

Revision as of 05:11, 6 August 2008

Image change detection:

Using vertical and horizontal RGB components sums of a thresholded difference between a reference image and the current one,

it is easy to compute the screen coordinates of a played stone

Geometric projection:

It is necessary to map each point from a reference rectangle to a point in the displayed shape, or vice-versa;

without considering scene, camera or observer parameters.

The only data available are the corner coordinates on the projection plane and the reference rectangle proportions.

Methods for mapping the coordinates:

"2.2 Perspective transformation with two vanishing points" (pages 2 and 3, equations 7 and 10)

http://cipa.icomos.org/fileadmin/papers/potsdam/2001-21-gf01a.pdf

Inverse homography and plane image rectification (page 14)

http://www-prima.imag.fr/jlc/Courses/2002/DEA-IVR.VO/DEA-IVR.VO.S2.pdf

"Inferring Projective Mappings" (page 3)

http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.9.7803

with related java source code here: http://www.developpez.net/forums/showthread.php?t=591698

Links:

irc://irc.freenode.net/#kifu

http://www.sourceforge.net/projects/kifu

Photointerpretation and Small Scale Stereoplotting with Digitally Rectified Photographs with Geometrical constraints: http://cipa.icomos.org/fileadmin/papers/potsdam/2001-21-gf01a.pdf

Vision par Ordinateur: http://www-prima.imag.fr/jlc/Courses/2002/DEA-IVR.VO/DEA-IVR.VO.S2.pdf

Projective Mappings for Image Warping: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.9.7803

http://sciences.ch/htmlfr/geometrie/geometrieprojective01.php

@@ Line 1: / Line 1: @@
 '''Image change detection:'''
-Using vertical RGB components sums of a thresholded difference between a reference image and the current one, it is easy to compute the screen coordinates of a played stone
+Using vertical and horizontal RGB components sums of a thresholded difference between a reference image and the current one,
+it is easy to compute the screen coordinates of a played stone
 '''Geometric projection:'''
-It is necessary to map each point from a reference rectangle to a point
+It is necessary to map each point from a reference rectangle to a point in the displayed shape, or vice-versa;
-in the displayed shape, or vice-versa.
-Without considering scene, camera or observer parameters.
+without considering scene, camera or observer parameters.
-The only data available are the corner coordinates on the projection plane.
+The only data available are the corner coordinates on the projection plane
+and the reference rectangle proportions.
-Three methods for mapping the coordinates:
-http://cipa.icomos.org/fileadmin/papers/potsdam/2001-21-gf01a.pdf
+----
+'''Methods for mapping the coordinates:'''
 "2.2 Perspective transformation with two vanishing points"
 (pages 2 and 3, equations 7 and 10)
+http://cipa.icomos.org/fileadmin/papers/potsdam/2001-21-gf01a.pdf
-http://www-prima.imag.fr/jlc/Courses/2002/DEA-IVR.VO/DEA-IVR.VO.S2.pdf
 Inverse homography and plane image rectification (page 14)
+http://www-prima.imag.fr/jlc/Courses/2002/DEA-IVR.VO/DEA-IVR.VO.S2.pdf
-Or to compute a 3x3 transformation matrix to map any point of the
-displayed quadrilateral shape to a rectangular shape.
-To compute the tranformation matrix, somebody given me this '''unworking formulae.'''
+"Inferring Projective Mappings" (page 3)
-(maybe i could just not use it properly) :
+http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.9.7803
-X: screen projection coordinates
+with related java source code here: http://www.developpez.net/forums/showthread.php?t=591698
-X': goban corners coordinates
-X=[x1 x2 x3 x4; y1 ... y4; 1 ... 1]
-X'=[x1' x2' x3' x4'; y1' ... y4'; 1 ... 1]
-H=X'Xt(XXt)^-1   (with Xt = transposed matrix of X)
-p'=Hp
-p'=[a;b;c]
-x=a/c
-y=b/c
@@ Line 55: / Line 42: @@
-Links:
+'''Links:'''
 irc://irc.freenode.net/#kifu
@@ Line 61: / Line 48: @@
 http://www.sourceforge.net/projects/kifu
-Perspective transformation:
+Photointerpretation and Small Scale Stereoplotting with Digitally Rectified Photographs with Geometrical constraints:
 http://cipa.icomos.org/fileadmin/papers/potsdam/2001-21-gf01a.pdf
-Inverse homography:
+Vision par Ordinateur:
 http://www-prima.imag.fr/jlc/Courses/2002/DEA-IVR.VO/DEA-IVR.VO.S2.pdf
+Projective Mappings for Image Warping:
+http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.9.7803
 http://sciences.ch/htmlfr/geometrie/geometrieprojective01.php

Kifu: Go game record (kifu) generator: Difference between revisions

Revision as of 05:11, 6 August 2008

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