https://wiki.panotools.org/api.php?action=feedcontributions&user=Junreybosh&feedformat=atomPanoTools.org Wiki - User contributions [en]2024-03-19T07:33:34ZUser contributionsMediaWiki 1.35.3https://wiki.panotools.org/index.php?title=Control_points&diff=13364Control points2011-04-06T12:27:55Z<p>Junreybosh: </p>
<hr />
<div>{{Glossary|are used to identify matching features in adjacent images.}}<br />
Most techniques for aligning photographs involve '''Control points''' at some stage.<br />
<br />
The principle is that by identifying the same physical features (a door, a tree, whatever) in<br />
more than one photo, it is possible to establish facts about the relative camera orientations<br />
mathematically. The [[pano12]] library contains a program called [[PTOptimizer]] that does this job.<br />
<br />
Each of these real-world features is defined as a ''pair'' of control points. Usually two<br />
''pairs'' of control points are sufficient to simply align one photograph against another, and<br />
more photographs require more ''pairs'' - This alignment <span class="plainlinks">[http://www.merchantos.com <span style="color:black;font-weight:normal; text-decoration:none!important; background:none!important; text-decoration:none;">pos software</span>] process is called ''control point optimisation''.<br />
<br />
As well as adjusting this [[roll]], [[pitch]] & [[yaw]] orientation, often<br />
[[Field of View]] and other aspects of the [[lens correction model]] are ''optimised'' at the same<br />
time.<br />
<br />
Control points can be picked manually by clicking with a mouse, and there are a number of<br />
[[GUI front-ends]] to help you do this. There are other tools such as [[autopano-sift]] and<br />
[[autopano]] that can generate control points automatically with some limitations.<br />
<br />
In addition to these simple control points, [[PTOptimizer]] allows users to define<br />
[[horizontal control points]], [[vertical control points]] and [[straight line control points]].<br />
These have various uses, but mainly they are good for [[Leveling a Finished Panorama]] and<br />
[[perspective correction]].<br />
<br />
== Historical note ==<br />
<br />
Before [[PTPicker]], the [[GUI front-ends]] and [[autopano]]/[[autopano-sift]], control points<br />
were set by cutting and pasting the flags below into source photos. You were allowed up to<br />
twenty pairs of points and twenty images - Panorama Tools would read the bar codes embedded in<br />
the flags and generate a script for [[PTOptimizer]].<br />
<br />
This functionality is still available in the ''adjust'' menu of the [[Panorama Gimp plug-in]],<br />
however the technique is extremely laborious and '''definitely not recommended'''.<br />
<br />
[[Image:Flags.png|Barcode flags used by the original panorama tools control point picking technique]]<br />
<br />
[[Category:Glossary]]</div>Junreyboshhttps://wiki.panotools.org/index.php?title=Control_points&diff=13363Control points2011-04-06T12:27:07Z<p>Junreybosh: </p>
<hr />
<div>{{Glossary|are used to identify matching features in adjacent images.}}<br />
Most techniques for aligning photographs involve '''Control points''' at some stage.<br />
<br />
The principle is that by identifying the same physical features (a door, a tree, whatever) in<br />
more than one photo, it is possible to establish facts about the relative camera orientations<br />
mathematically. The [[pano12]] library contains a program called [[PTOptimizer]] that does this job.<br />
<br />
Each of these real-world features is defined as a ''pair'' of control points. Usually two<br />
''pairs'' of control points are sufficient to simply align one photograph against another, and<br />
more photographs require more ''pairs'' - This alignment process is called ''control point optimisation''.<br />
<br />
As well as adjusting this [[roll]], [[pitch]] & [[yaw]] orientation, often<br />
[[Field of View]] and other aspects of the [[lens correction model]] are ''optimised'' at the same<br />
time.<br />
<br />
Control points can be picked manually by clicking with a mouse, and there are a number of<br />
[[GUI front-ends]] to help you do this. There are other tools such as [[autopano-sift]] and<br />
[[autopano]] that can generate control points automatically with some limitations.<br />
<br />
In addition to these simple control points, [[PTOptimizer]] allows users to define<br />
[[horizontal control points]], [[vertical control points]] and [[straight line control points]].<br />
These have various uses, but mainly they are good for [[Leveling a Finished Panorama]] and<br />
[[perspective correction]].<br />
<br />
== Historical note ==<br />
<br />
Before [[PTPicker]], the [[GUI front-ends]] and [[autopano]]/[[autopano-sift]], control points<br />
were set by cutting and pasting the flags below into source photos. You were allowed up to<br />
twenty pairs of points and twenty images - Panorama Tools would read the bar codes embedded in<br />
the flags and generate a script for [[PTOptimizer]].<br />
<br />
This functionality is still available in the ''adjust'' menu of the [[Panorama Gimp plug-in]],<br />
however the technique is extremely laborious and '''definitely not recommended'''.<br />
<br />
[[Image:Flags.png|Barcode flags used by the original panorama <span class="plainlinks">[http://www.merchantos.com <span style="color:black;font-weight:normal; text-decoration:none!important; background:none!important; text-decoration:none;">pos software</span>] tools control point picking technique]]<br />
<br />
[[Category:Glossary]]</div>Junreybosh