Horizontal control points - Revision history

Bruno: t3, t4 etc...

2010-04-09T22:49:40Z

t3, t4 etc...

Mfwitten: straight line control points are t3 control points

2010-04-09T08:31:45Z

straight line control points are t3 control points

Erik Krause: basic page

2007-11-20T15:25:51Z

basic page

New page

{{Glossary|[[Control points]] that define a horizontal line in the output [[projection]].}}
The panorama tools [[PTOptimizer|optimizer]] 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.

The main use of '''horizontal control points''' is to change the perspective of the output panorama such that the marked structures are horizontal in the output [[projection]]. In a multi image panorama this is only possible if the [[optimization]] of [[Roll]] and [[Pitch]] is allowed for all images and of [[Yaw]] for all but the anchor image.

You set '''horizontal control points''' on a horizontal structure apart from each other. However, be careful in a [[cylindrical]] or [[equirectangular]] panorama not to set them 180° apart, since this won't level the horizon.

Please note that all real world horizontal lines only stay horizontal in [[rectilinear]] projection. In [[cylindrical]], [[equirectangular]] and [[fisheye]] projections only the horizon itself stays horizontal.

More details in [[Perspective correction]] and [[Panotools internals#Line_control_points|Panotools internals]]

@@ Line 4: / Line 4: @@
 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.
+and [[straight line control points]] are '''t3''', '''t4''', etc... points.
 The main use of '''horizontal control points''' is to change the perspective of the output panorama such that the marked structures are horizontal in the output [[projection]]. In a multi image panorama this is only possible if the [[optimization]] of [[Roll]] and [[Pitch]] is allowed for all images and of [[Yaw]] for all but the anchor image.

@@ Line 2: / Line 2: @@
 The panorama tools [[PTOptimizer|optimizer]] understands various different schemes for
 aligning photos using [[control points]]:
-Normal points are '''t0''' points, horizontal control points are '''t1''' points and
+Normal points are '''t0''' points, horizontal control points are '''t1''' points,
-[[vertical control points]] are '''t2''' points.
+[[vertical control points]] are '''t2''' points,
 The main use of '''horizontal control points''' is to change the perspective of the output panorama such that the marked structures are horizontal in the output [[projection]]. In a multi image panorama this is only possible if the [[optimization]] of [[Roll]] and [[Pitch]] is allowed for all images and of [[Yaw]] for all but the anchor image.