Unusual remappings - Revision history

Erik Krause: Updated to newer GUIs

2011-01-09T18:06:21Z

Updated to newer GUIs

Erik Krause: outdated

2011-01-03T22:53:40Z

outdated

Alfv: Update: PTGUI since 8.1beta2 supports "Little Planet" projection directly

2009-02-19T16:20:38Z

Update: PTGUI since 8.1beta2 supports "Little Planet" projection directly

Erik Krause: /* Orientation plate (arc) */ typo

2008-04-12T13:49:04Z

‎Orientation plate (arc): typo

Erik Krause: /* Steps */ Updated to PTGui since v7

2008-01-17T09:03:08Z

‎Steps: Updated to PTGui since v7

Erik Krause: added fisheye from equirect.

2007-11-22T19:26:22Z

added fisheye from equirect.

Imroy: copyedit

2007-09-26T13:01:48Z

copyedit

Loh: /* Unusual remappings */ Typo

2007-04-09T23:30:11Z

‎Unusual remappings: Typo

Erik Krause: 1 revision(s)

2007-03-21T18:09:05Z

1 revision(s)

Erik Krause at 18:07, 21 March 2007

2007-03-21T18:07:00Z

@@ Line 4: / Line 4: @@
 == Little planet ==
-[[Image:little planet.jpg|thumb|250px|Little planet remapping result © Erik Krause]]
+[[Image:little planet.jpg|thumb|250px|Fisheye little planet remapping result © Erik Krause]]
-This is a remapping already used by Helmut Dersch as a thumbnail for his virtual Marburg tour on [http://www.path.unimelb.edu.au/~dersch/] (scroll down on the page). It remaps an [[equirectangular]] full spherical panorama to a virtual 360 degree fisheye image with the [[nadir]] in the center and the [[zenith]] at the circle border. Unfortunately neither the versions of PTGui prior to [http://www.ptgui.com/beta.html 8.1beta2] nor hugin support this remapping directly, hence we have to modify the [[PTStitcher]] script.
+[[Image:little planet2.jpg|thumb|250px|Stereographic little planet remapping result © Erik Krause]]
-=== Steps ===
+Some [[Panorama Viewers]] like f.e. KRPano or DevalVR also feature stereographic projection or even "Little Planet" directly.
-* Open PTGui, choose '''Advanced mode''' and load your equirect image on '''Source Images''' tab page.
-* On '''Lens Settings''' tab page choose '''Equirectangular''' from the '''Lens type''' list, set '''Hor. Field of View''' to 360 degrees and click '''Restore defaults''' in the '''Advanced''' frame in order to set all lens correction parameters to 0.0.
-* On '''Image parameters''' tab page click the '''Pitch''' field for your image and set it to 90 in order to view straight down.
-* On '''Create Panorama''' tab page set the width and file format you want for your output image. One single image is created hence any single image format is good. Don't forget the image name.
-−
-==== PTGui version 7 to 8.1beta1 ====
-* On '''Panorama Settings''' tab page choose '''Projection: Fullframe''' and set '''Field of View''' to 360 x 360 degrees.
-* On '''Create Panorama''' tab page choose '''Stitch using: PTGui''' from the '''Advanced''' frame.
-* Click '''Create panorama'''.
-−
-==== Older PTGui ====
-* On '''Panorama Settings''' tab page choose '''Projection: Equirectangular''' and set '''Field of View''' to 180 x 180 degrees. This is for convenience only. The values will be changed later.
-* On '''Create Panorama''' tab page choose '''Stitch using: Panorama Tools (PTStitcher)''' from the '''Advanced''' frame and check '''Show script'''.
-* Click '''Create panorama'''. The script will be shown.
-* In the line beginning with the letter p change '''f2''' to '''f3''' and '''v180''' to '''v360'''. Click Ok.
-−
-In both cases the resulting image is supposed to be a "Full Frame Fisheye", hence you need to crop it to a circular frame in your image editor.
 === Tweaks ===
-[[Image:little planet tweaks.jpg|thumb|250px|Pano editor tweaks in PTGui]]
+If you don't like the rotation of the result image you use '''Numerical transform''' from the PTGui panorama editor (Ctrl+E). Enter a step value for '''Roll''' (f.e. -10) and press '''Apply''' button repeatedly until you like the rotation.
-If you don't like the rotation of the result image you use '''Numerical transform''' from the PTGui panorama editor (Ctrl+E). Enter a step value for '''Roll''' (f.e. -10) and press '''Apply''' button repeatedly until you like the roation. The display in pano editor will be in equirect, not in "little planet" of course.
 You can change "Little planet" to "Tunnel view" (same projection with the [[zenith]] in the center and the [[nadir]] on the outer side) if you put -90 in the '''Pitch''' field on '''Image tab''' in order to view straight up.
-=== Fisheye from equirect ===
+=== Older GUI Versions ===
-With exactly the same technique as "Little Planet" you can extract a [[fisheye]] image from a spherical panorama. Follow all steps until it comes to editing the script. In the script line beginning with the letter p change '''f2''' to '''f3''' and leave '''v180'''. Click Ok. Crop the resulting image to a circular frame in your image editor. That's all.
 {{clr}}
@@ Line 84: / Line 69: @@
 It is advisable to choose slightly larger values for both horizontal and vertical result FoV in order not to loose any pixels.
 [[Category:Tutorial:Specialised]]

← Older revision		Revision as of 22:53, 3 January 2011
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	[[Category:Tutorial:Specialised]]		[[Category:Tutorial:Specialised]]
		+	{{Outdated}}

@@ Line 5: / Line 5: @@
 == Little planet ==
 [[Image:little planet.jpg|thumb|250px|Little planet remapping result © Erik Krause]]
-This is a remapping already used by Helmut Dersch as a thumbnail for his virtual Marburg tour on [http://www.path.unimelb.edu.au/~dersch/] (scroll down on the page). It remaps an [[equirectangular]] full spherical panorama to a virtual 360 degree fisheye image with the [[nadir]] in the center and the [[zenith]] at the circle border. Unfortunately neither PTGui nor hugin support this remapping directly, hence we have to modify the [[PTStitcher]] script.
+This is a remapping already used by Helmut Dersch as a thumbnail for his virtual Marburg tour on [http://www.path.unimelb.edu.au/~dersch/] (scroll down on the page). It remaps an [[equirectangular]] full spherical panorama to a virtual 360 degree fisheye image with the [[nadir]] in the center and the [[zenith]] at the circle border. Unfortunately neither the versions of PTGui prior to [http://www.ptgui.com/beta.html 8.1beta2] nor hugin support this remapping directly, hence we have to modify the [[PTStitcher]] script.
@@ Line 14: / Line 14: @@
 * On '''Create Panorama''' tab page set the width and file format you want for your output image. One single image is created hence any single image format is good. Don't forget the image name.
-==== PTGui since version 7 ====
+==== PTGui version 7 to 8.1beta1 ====
 * On '''Panorama Settings''' tab page choose '''Projection: Fullframe''' and set '''Field of View''' to 360 x 360 degrees.
 * On '''Create Panorama''' tab page choose '''Stitch using: PTGui''' from the '''Advanced''' frame.

@@ Line 40: / Line 40: @@
 [[Image:orientation-plate.jpg|thumb|250px|Arc formed panorama © Erik Krause]]
-On some places with wide panoramic vistas you can find orientation plates. Arc formed prints of the panorama. Panotools can make this remapping from a cylindrical panorama to an arc formed one, too. No need to edit scripts here but a pocked calculator might be of some use and you should know the approximate horizontal [[Field of View]] (here abbreviated as '''hFoV''') of your panorama. This works even for 360 degree panoramas.
+On some places with wide panoramic vistas you can find orientation plates. Arc formed prints of the panorama. Panotools can make this remapping from a cylindrical panorama to an arc formed one, too. No need to edit scripts here but a pocket calculator might be of some use and you should know the approximate horizontal [[Field of View]] (here abbreviated as '''hFoV''') of your panorama. This works even for 360 degree panoramas.
 === Steps ===

@@ Line 11: / Line 11: @@
 * Open PTGui, choose '''Advanced mode''' and load your equirect image on '''Source Images''' tab page.
 * On '''Lens Settings''' tab page choose '''Equirectangular''' from the '''Lens type''' list, set '''Hor. Field of View''' to 360 degrees and click '''Restore defaults''' in the '''Advanced''' frame in order to set all lens correction parameters to 0.0.
 * On '''Image parameters''' tab page click the '''Pitch''' field for your image and set it to 90 in order to view straight down.
-* On '''Create Panorama''' tab page set the width and file format you want for your output image. One single image is created hence any single image format is good. Don't forget the image name. Choose '''Stitch using: Panorama Tools (PTStitcher)''' from the '''Advanced''' frame and check '''Show script'''.
+* On '''Create Panorama''' tab page set the width and file format you want for your output image. One single image is created hence any single image format is good. Don't forget the image name.
 * Click '''Create panorama'''. The script will be shown.
 * In the line beginning with the letter p change '''f2''' to '''f3''' and '''v180''' to '''v360'''. Click Ok.
-The resulting image is supposed to be a "Full Frame Fisheye", hence you need to crop it to a circular frame in your image editor.
+In both cases the resulting image is supposed to be a "Full Frame Fisheye", hence you need to crop it to a circular frame in your image editor.
 === Tweaks ===

← Older revision		Revision as of 19:26, 22 November 2007
Line 24:		Line 24:

	You can change "Little planet" to "Tunnel view" (same projection with the [[zenith]] in the center and the [[nadir]] on the outer side) if you put -90 in the '''Pitch''' field on '''Image tab''' in order to view straight up.		You can change "Little planet" to "Tunnel view" (same projection with the [[zenith]] in the center and the [[nadir]] on the outer side) if you put -90 in the '''Pitch''' field on '''Image tab''' in order to view straight up.
		+
		+	=== Fisheye from equirect ===
		+	With exactly the same technique as "Little Planet" you can extract a [[fisheye]] image from a spherical panorama. Follow all steps until it comes to editing the script. In the script line beginning with the letter p change '''f2''' to '''f3''' and leave '''v180'''. Click Ok. Crop the resulting image to a circular frame in your image editor. That's all.

	{{clr}}		{{clr}}

@@ Line 1: / Line 1: @@
-= Unusual remappings =
+The possibilities of panotools go far beyond mere panorama stitching. Due to its flexibility and modular design there are some remappings possible that (may be) were not intended originally. It is possible to perform these (and other unusual) remappings using the [[Panorama Tools Plugins]]. There is a Photoshop action by Flemming V. Larsen which uses the plugins: [http://www.fvlmedia.dk/temp/remappano.htm].
-The possibilities of panotools go far beyond mere panorama stitching. Due to it's flexibility and modular design there are some remappings possible that (may be) were not intended originally. It is possible to perform these (and other unusual) remappings using the [[Panorama Tools Plugins]]. There is a photoshop action by Flemming V. Larsen which uses the plugins: [http://www.fvlmedia.dk/temp/remappano.htm].
 I prefer to use one of the [[GUI front-ends]], since they allow for a more convenient control. I've used [[PTGui]] here but it should be possible with [[hugin]], [[PTAssembler]] or [[PTMac]] in a similar way.
 == Little planet ==
 This is a remapping already used by Helmut Dersch as a thumbnail for his virtual Marburg tour on [http://www.path.unimelb.edu.au/~dersch/] (scroll down on the page). It remaps an [[equirectangular]] full spherical panorama to a virtual 360 degree fisheye image with the [[nadir]] in the center and the [[zenith]] at the circle border. Unfortunately neither PTGui nor hugin support this remapping directly, hence we have to modify the [[PTStitcher]] script.
 === Steps ===
 * Open PTGui, choose '''Advanced mode''' and load your equirect image on '''Source Images''' tab page.
@@ Line 20: / Line 19: @@
 The resulting image is supposed to be a "Full Frame Fisheye", hence you need to crop it to a circular frame in your image editor.
 === Tweaks ===
 If you don't like the rotation of the result image you use '''Numerical transform''' from the PTGui panorama editor (Ctrl+E). Enter a step value for '''Roll''' (f.e. -10) and press '''Apply''' button repeatedly until you like the roation. The display in pano editor will be in equirect, not in "little planet" of course.
-You can change "Little planet" to "Tunnel view" (same projection with the [[zenith]] in the center and the [[nadir]] on the outer side) if you put -90 in the '''Pitch''' field on '''Image tab''' in order to view straight up.{{clr}}
+You can change "Little planet" to "Tunnel view" (same projection with the [[zenith]] in the center and the [[nadir]] on the outer side) if you put -90 in the '''Pitch''' field on '''Image tab''' in order to view straight up.
 == Orientation plate (arc) ==
-[[Image:orientation-plate.jpg|thumb|250px|Arc formed panorama &copy; Erik Krause]]
+[[Image:orientation-plate.jpg|thumb|250px|Arc formed panorama © Erik Krause]]
 On some places with wide panoramic vistas you can find orientation plates. Arc formed prints of the panorama. Panotools can make this remapping from a cylindrical panorama to an arc formed one, too. No need to edit scripts here but a pocked calculator might be of some use and you should know the approximate horizontal [[Field of View]] (here abbreviated as '''hFoV''') of your panorama. This works even for 360 degree panoramas.
@@ Line 34: / Line 34: @@
 [[Image:pano-editor-settings.jpg|thumb|250px|Pano editor and pano settings in PTGui]]
 [[Image:pano-editor-settings-360.jpg|thumb|250px|Pano editor and lens settings for 360 degree in PTGui]]
-[[Image:orientation-plate-360.jpg|thumb|250px|Arc formed 360 degree panorama &copy; Erik Krause]]
+[[Image:orientation-plate-360.jpg|thumb|250px|Arc formed 360 degree panorama © Erik Krause]]
 * Open PTGui, choose '''Advanced mode''' and load your cylindrical image on '''Source Images''' tab page. Note down the pixel sizes. In our example these are 4254x400 pixels.
@@ Line 45: / Line 45: @@
 * On '''Image parameters''' tab page click the '''Pitch''' field for your image and set it to 90 in order to view straight down.
 * On '''Create Panorama''' tab page set the width and file format you want for your output image. One single image is created hence any single image format is good. Don't forget the image name. Choose '''Stitch using: Panorama Tools (PTStitcher)''' from the '''Advanced''' frame and uncheck '''Use fast transform'''.
-* Open panorama editor (Ctrl+E) and adjust panorama width and height using the sliders such that it contains the whole arc. Ocassionaly PTGui fails to display the arc correctly in pano editor. In this case you need to calculate the appropriate values. See below for details.
+* Open panorama editor (Ctrl+E) and adjust panorama width and height using the sliders such that it contains the whole arc. Occasionally PTGui fails to display the arc correctly in pano editor. In this case you need to calculate the appropriate values. See below for details.
 * On '''Create Panorama''' tab page check the output size and click '''Create panorama'''.
 You might want to crop the result image in your image editor in order to get rid of the black space.
 === Tweaks ===
-Since the source panorama is arched, the pixels have to be compressed at the inner side and stretched at the outer side. There is a line in the middle where there is no stretching or compression. In most cases it is desireable that this line is the horizon which is assumed to be half way between upper and lower edge of the panorama. If you want this line to be somewhere else simply use a different image shift (e) value. For example -2231 will shift 200 pixels further down (nearer to the center of the result image) than -2031 and create a smaller and narrower arc.
+Since the source panorama is arched, the pixels have to be compressed at the inner side and stretched at the outer side. There is a line in the middle where there is no stretching or compression. In most cases it is desirable that this line is the horizon which is assumed to be half way between upper and lower edge of the panorama. If you want this line to be somewhere else simply use a different image shift (e) value. For example -2231 will shift 200 pixels further down (nearer to the center of the result image) than -2031 and create a smaller and narrower arc.
 The above calculation
@@ Line 58: / Line 57: @@
 actually calculates the virtual radius (half of the diameter of the cylinder it is projected on) of the cylindrical source image in pixels. We will need this value '''r''' for the following calculation.
-Result images might get very large large since they have to be symmetrical to the center point of the arcs circle, which requires a lot of black space especially if the source panorama HFoV is low. Occasionaly PTGui pano editor doesn't show the correct result image (although PTStitcher will create the arc correctly) making it impossible to adjust the panorama size manually.
+Result images might get very large large since they have to be symmetrical to the center point of the arcs circle, which requires a lot of black space especially if the source panorama HFoV is low. Occasionally PTGui pano editor doesn't show the correct result image (although PTStitcher will create the arc correctly) making it impossible to adjust the panorama size manually.
 In both cases it might be interesting to create the minimum possible size that covers the whole arc. Since '''Fit Panorama''' (in PTGui pano editor) fails in this case we need to calculate the values ourselves.
@@ Line 72: / Line 71: @@
 In our example
   <math>2*arctan\left(sin\left(\frac{120}{2}\right)*tan\left(\frac{96}{2}\right)\right)=87.77^\circ</math>
-It is advisable to choose sligtly larger values for both horizontal and vertical result FoV in order not to loose any pixels.
+It is advisable to choose slightly larger values for both horizontal and vertical result FoV in order not to loose any pixels.
 <small>--[[User:Erik Krause|Erik Krause]] 16:09, 13 Dec 2005 (EST)</small>
 [[Category:Tutorial:Specialised]]

← Older revision		Revision as of 18:07, 21 March 2007
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	<small>--[[User:Erik Krause\|Erik Krause]] 16:09, 13 Dec 2005 (EST)</small>		<small>--[[User:Erik Krause\|Erik Krause]] 16:09, 13 Dec 2005 (EST)</small>

−	~~[[Category:Tutorial]]~~[[Category:Tutorial:Specialised]]	+	[[Category:Tutorial:Specialised]]