Straight line control points - Revision history

Erik Krause: typo

2010-04-11T20:59:34Z

typo

Bruno: t3, t4 etc...

2010-04-09T22:48:04Z

t3, t4 etc...

Mfwitten: optimiser -> optimizer (to be consistent)

2010-04-09T08:38:36Z

optimiser -> optimizer (to be consistent)

Mfwitten: No need to link to oneself.

2010-04-09T08:34:43Z

No need to link to oneself.

Mfwitten: straight line control points are t3 points

2010-04-09T08:33:42Z

straight line control points are t3 points

Erik Krause: Prepared for new glossary template

2007-11-18T19:34:35Z

Prepared for new glossary template

Bruno: basic page, could use some images

2006-10-01T15:59:21Z

basic page, could use some images

New page

The panorama tools optimiser understands various different schemes for
aligning photos using [[control points]]:
Normal points are '''t0''' points, [[horizontal control points]] are '''t1''' points and
[[vertical control points]] are '''t2''' points.

'''Straight line control points''' were added later and have a similar effect to horizontal
and vertical points, except that the straight line can be at any angle. They have two main uses:
Lining up linear features that don't have identifiable detail, such as the edges of a room or
overhead cables; and calibrating [[lens distortion]] using a single
[[rectilinear Projection|rectilinear]] photograph of a grid or building.

Although two points are sufficient to define a horizontal or vertical line, more are
required for these lines at arbitrary angles. Since the script file format only supports 'pairs' of
points, a straight line is generally defined with four, six or eight etc... control points.

Some of the [[GUI front-ends]] support placing these '''straight line control points''', see this
tutorial on [http://www.erik-krause.de/verzeichnung/distort_en.htm correcting lens distortion with ptgui].

Otherwise if you edit a [[PTOptimizer]] script and make more than one pair of existing points
'''t3''', then the optimiser will try to line them up as a straight
line in the output image. You can keep going, with '''t4''', '''t5''' etc... for each group of points
that you want in different 'straight lines'.

[[Category:Glossary]]

@@ Line 3: / Line 3: @@
 aligning photos using [[control points]]:
 Normal points are '''t0''' points, [[horizontal control points]] are '''t1''' points,
-[[vertical control points]] are '''t2''' points, and straight line control points are '''t3''' points.
+[[vertical control points]] are '''t2''' points, and straight line control points are '''t3''', '''t4''', etc... points.
 '''Straight line control points''' were added later and have a similar effect to horizontal

@@ Line 1: / Line 1: @@
 {{Glossary|[[Control points]] that define a straight line in the output [[projection]].}}
-The panorama tools optimiser understands various different schemes for
+The panorama tools optimizer understands various different schemes for
 aligning photos using [[control points]]:
 Normal points are '''t0''' points, [[horizontal control points]] are '''t1''' points,

@@ Line 3: / Line 3: @@
 aligning photos using [[control points]]:
 Normal points are '''t0''' points, [[horizontal control points]] are '''t1''' points,
-[[vertical control points]] are '''t2''' points, and [[straight line control points]] are '''t3''' points.
+[[vertical control points]] are '''t2''' points, and straight line control points are '''t3''' points.
 '''Straight line control points''' were added later and have a similar effect to horizontal

← Older revision		Revision as of 19:34, 18 November 2007
Line 1:		Line 1:
		+	{{Glossary\|[[Control points]] that define a straight line in the output [[projection]].}}
	The panorama tools optimiser understands various different schemes for		The panorama tools optimiser understands various different schemes for
	aligning photos using [[control points]]:		aligning photos using [[control points]]:

@@ Line 5: / Line 5: @@
 [[vertical control points]] are '''t2''' points, and straight line control points are '''t3''', '''t4''', etc... points.
-'''Straight line control points''' were added later and have a similar effect to horizontal
+'''Straight line control points''' were added later and have a similar effect as horizontal
 and vertical points, except that the straight line can be at any angle.  They have two main uses:
 Lining up linear features that don't have identifiable detail, such as the edges of a room or