Stitching a photo-mosaic - Revision history

Thomas: moved Stiching a photo-mosaic to Stitching a photo-mosaic: Fixes typo

2011-06-01T15:40:42Z

moved Stiching a photo-mosaic to Stitching a photo-mosaic: Fixes typo

Erik Krause: /* Parameters */ link

2011-01-06T10:56:00Z

‎Parameters: link

Erik Krause: categorized

2010-06-25T13:40:52Z

categorized

TheO at 08:21, 28 April 2010

2010-04-28T08:21:19Z

TheO at 08:18, 28 April 2010

2010-04-28T08:18:31Z

TheO at 14:38, 27 April 2010

2010-04-27T14:38:29Z

TheO at 14:30, 27 April 2010

2010-04-27T14:30:32Z

TheO at 14:05, 27 April 2010

2010-04-27T14:05:35Z

TheO: /* Understanding the mosaic-lens model */

2010-04-27T14:02:52Z

‎Understanding the mosaic-lens model

TheO: Created page with 'This section is a stub. == Definition of photo-mosaic == A photo-mosaic is an image that is stiched together by photographs all taken from different viewpoints. This differ...'

2010-04-27T13:58:17Z

Created page with 'This section is a stub. == Definition of photo-mosaic == A photo-mosaic is an image that is stiched together by photographs all taken from different viewpoints. This differ...'

New page

This section is a stub.

== Definition of photo-mosaic ==

A photo-mosaic is an image that is stiched together by photographs all taken from different viewpoints. This differs from the [[panorama]] where all images are taken from one single viewpoint but with different angles.

The typical case of a photo-mosaic is the [[linear panorama]], where one large subject like a wall, is photographed by taking photos of the wall, each covering a proportion of the wall, and moving the camera parallell to the wall with each shot.

The classical way to stich these kinds of mosaics was to lay the prints out on a light-table and glue them together. Now with the mosaic-mode in the panotools lens model, it is possible to use the software estimate the camera position including angles, lens distorsion etc. and to reproject and stich the images to a photo-mosaic.

== Understanding the mosaic-lens model ==

The panotools lens model has been expanded with three new parameters that describe the camera position in cartesian coordinates, Tx, Ty, and Tz

Legend:

* The unit-panosphere is drawn in gray.
* "The panorama camera" is centered in Origo, X,Y,Z =0
* Three photos are taken with camera positions 1, 2 and 3
Note that I have given these cameras different local Yaw angles

My assumption was
* The model uses separate camera positions 1, and 3 that have different X and Z values in this case
* The photos are reprojected to a plane that touches the panoshere in (0,0,-1) and then onto the panoshere using the "Panorama camera"
* The camera angles (y, p ,r) are applied in each camera position

@@ Line 16: / Line 16: @@
 === Parameters ===
-The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in [cartesian coordinates[http://en.wikipedia.org/wiki/Cartesian_coordinate_system]], TrX, TrY, and TrZ
+The panotools [[Lens correction model|lens model]] has been expanded with addition of three new parameters that describe the camera position in [cartesian coordinates[http://en.wikipedia.org/wiki/Cartesian_coordinate_system]], TrX, TrY, and TrZ
 The [[yaw]], [[pitch]] and [[roll]] angles now apply on the camera around the camera's TrX, TrY and TrZ position in space. Together these six parameters describe where the camera viewpoint is (TrX,TrY,TrZ) and the direction the camera's optical axis point(y,p,r).

← Older revision		Revision as of 13:40, 25 June 2010
Line 39:		Line 39:
	=== Result ===		=== Result ===
	Because the projection plane is a plane and perpendicular to the panorama camera, there will be miss-fit when this assumption is not true for the real-world subject. For example, photos of a flat wall mural could be rendered perfect, while a three dimensional subject would not be.		Because the projection plane is a plane and perpendicular to the panorama camera, there will be miss-fit when this assumption is not true for the real-world subject. For example, photos of a flat wall mural could be rendered perfect, while a three dimensional subject would not be.
		+
		+	[[Category:How it works]]

@@ Line 16: / Line 16: @@
 === Parameters ===
-The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in [cartesian coordinates], TrX, TrY, and TrZ
+The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in [cartesian coordinates[http://en.wikipedia.org/wiki/Cartesian_coordinate_system]], TrX, TrY, and TrZ
 The [[yaw]], [[pitch]] and [[roll]] angles now apply on the camera around the camera's TrX, TrY and TrZ position in space. Together these six parameters describe where the camera viewpoint is (TrX,TrY,TrZ) and the direction the camera's optical axis point(y,p,r).

@@ Line 5: / Line 5: @@
-A photo-mosaic is an image that is stiched together by photographs all taken from different viewpoints.   This differs from the [[panorama]] where all images are taken from one single viewpoint but with different angles.
+A photo-mosaic is an image that is stitched together by photographs all taken from different viewpoints.   This differs from the [[panorama]] where all images are taken from one single viewpoint but with different angles.
 The typical case of a photo-mosaic is the [[linear panorama]], where one large subject like a wall, is photographed by taking photos of the wall, each covering a proportion of the wall, and moving the camera parallel to the wall with each shot.
@@ Line 16: / Line 16: @@
 === Parameters ===
-The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in cartesian coordinates, TrX, TrY, and TrZ
+The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in [cartesian coordinates], TrX, TrY, and TrZ
 The [[yaw]], [[pitch]] and [[roll]] angles now apply on the camera around the camera's TrX, TrY and TrZ position in space. Together these six parameters describe where the camera viewpoint is (TrX,TrY,TrZ) and the direction the camera's optical axis point(y,p,r).

@@ Line 21: / Line 21: @@
 === Mosaic lens model ===
-In order to generate a photo-mosaic from the individual images, the panotools lens model reprojects the images in the following way.
+In order to generate a photo-mosaic from the individual images, the panotools lens model re-projects the images in the following way.
-* Each image is projected onto a plane with the coordinates of (0,0,1). This reprojection is using all the lens model's parameters. The position paramterers describe above, as well as FOV, distorsion. etc
+* Each image is projected onto a plane with the coordinates of (0,0,1). This re-projection is using all the lens model's parameters. The position parameters describe above, as well as FOV, distortion. etc
 * The plane is projected onto the panosphere
-* The panorama camera, which gives the viewpoint of the photo mosaic, sits in the center of the panoshere and looks straigh ahead at the panoshere (and the perpendicular projection plane).  This camera gives the FOV of the whole photo-mosaic
+* The panorama camera, which gives the viewpoint of the photo mosaic, sits in the center of the panosphere and looks straight ahead at the panosphere (and the perpendicular projection plane).  This camera gives the FOV of the whole photo-mosaic
@@ Line 32: / Line 32: @@
 * The unit-[[panosphere]] is drawn in gray.
 * "The panorama camera" is centered in Origo, X,Y,Z =0
-* Three photos are taken with camera positions 1, 2 and 3 by variying TrX,TrZ and Yaw
+* Three photos are taken with camera positions 1, 2 and 3 by varying TrX,TrZ and Yaw
 * The photos are reprojected to a plane (red) that touches the panosphere in (0,0,1) and then onto the panosphere using the "Panorama camera"
-[[File:Example.jpg]]
+[[File:Illustration4.png‎]]
 === Result ===
-The lens model used for the mosaic mode gives a number of effects.  Because the projection plane is a plane and perpendicular to the panorama camera, there will be miss-fit when this is not true for the real-world subject.  For example, photos of a flat wall mural could be rendered perfect, while a three dimensional subject would not be.
+Because the projection plane is a plane and perpendicular to the panorama camera, there will be miss-fit when this assumption is not true for the real-world subject.  For example, photos of a flat wall mural could be rendered perfect, while a three dimensional subject would not be.

@@ Line 14: / Line 14: @@
 == Understanding the mosaic-lens model ==
-The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in cartesian coordinates, Tx, Ty, and Tz
+The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in cartesian coordinates, TrX, TrY, and TrZ
-The [[yaw]], [[pitch]] and [[roll]] angles now apply on the camera around the camera's X, Y and Z position in space
+The [[yaw]], [[pitch]] and [[roll]] angles now apply on the camera around the camera's TrX, TrY and TrZ position in space

@@ Line 14: / Line 14: @@
 == Understanding the mosaic-lens model ==
-The panotools lens model has been expanded with three new parameters that describe the camera position in cartesian coordinates, Tx, Ty, and Tz
+The panotools [[lens model]] has been expanded with addition of three new parameters that describe the camera position in cartesian coordinates, Tx, Ty, and Tz
 Legend:
-* The unit-panosphere is drawn in gray.
+* The unit-[[panosphere]] is drawn in gray.
 * "The panorama camera" is centered in Origo, X,Y,Z =0
 * Three photos are taken with camera positions 1, 2 and 3
@@ Line 26: / Line 28: @@
 My assumption was
 * The model uses separate camera positions 1, and 3  that have different X and Z values in this case
-* The photos are reprojected to a plane that touches the panoshere in (0,0,-1) and then onto the panoshere using the "Panorama camera"
+* The photos are reprojected to a plane that touches the panosphere in (0,0,-1) and then onto the panosphere using the "Panorama camera"
 * The camera angles (y, p ,r) are applied in each camera position