How stitching works - Revision history

Groogle: Spelling

2009-04-05T02:51:21Z

Spelling

Klaus: insert symbol image at the top

2008-10-10T13:08:20Z

insert symbol image at the top

Klaus: /* Introduction */ save temp edit

2008-10-10T12:21:16Z

‎Introduction: save temp edit

Klaus: /* Introduction */ link Stitching

2008-05-05T12:19:42Z

‎Introduction: link Stitching

Klaus: /* Remapping */ link

2008-05-05T12:12:32Z

‎Remapping: link

Klaus: How Stitching Works moved to How stitching works: put lowercase into title - as suggested - majority of titles on this wiki seem to be that way

2008-05-05T12:02:13Z

How Stitching Works moved to How stitching works: put lowercase into title - as suggested - majority of titles on this wiki seem to be that way

Erik Krause: changed category to "How it works"

2008-05-04T14:12:07Z

changed category to "How it works"

Erik Krause: reverted to previous

2008-05-04T12:26:32Z

reverted to previous

Erik Krause: Redirecting to How stitching works

2008-05-04T11:44:55Z

Redirecting to How stitching works

Klaus: reworked text from Stitching 2008 State of the Art

2008-05-02T23:37:17Z

reworked text from Stitching 2008 State of the Art

@@ Line 50: / Line 50: @@
 [[Image:Img0823xstitch3.jpg|500px]]
-The relative camera orientation, and the lense parameters
+The relative camera orientation, and the lens parameters
 are determined from the images overlap area.
 Handheld photos are fine.

@@ Line 1: / Line 1: @@
 == Introduction ==
@@ Line 5: / Line 7: @@
 This page shows what stitching software actually does.
 <gallery>
 Image:Img08232.jpg
 Image:Img08231.jpg
 Image:Img0823xstitch5.jpg
-Image:Img0823xstitch6.jpg
+Image:Img0823xstitch6crop.jpg
 </gallery>
+-->
 If you want to know how to achieve this, or what
 [[software]] to use, please read a [[Tutorials|tutorial]] instead.

@@ Line 4: / Line 4: @@
 The ambition is to have the fact of individual ingredient photos no longer show through in the resulting image.
 This page shows what stitching software actually does.
 If you want to know how to achieve this, or what

@@ Line 1: / Line 1: @@
 == Introduction ==
-Stitching is about making one large image from several smaller photos.
+[[Stitching]] is about making one large image from several smaller photos.
 The ambition is to have the fact of individual ingredient photos no longer show through in the resulting image.
 This page shows what stitching software actually does.

@@ Line 30: / Line 30: @@
 or provide assistance for optimisations without requiring a try-and-error workflow.
-===Remapping===
+===[[Remapping]]===
 [[Image:Img08232remap.jpg|300px]] [[Image:Img08231remap.jpg|300px]]

← Older revision		Revision as of 14:12, 4 May 2008
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	for a state-of-the-art stitching of two photos.		for a state-of-the-art stitching of two photos.

−	[[Category:~~Info~~]]	+	[[Category:How it works]]

← Older revision		Revision as of 12:26, 4 May 2008
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−	~~#REDIRECT [[How stitching works]]~~
	== Introduction ==		== Introduction ==

← Older revision		Revision as of 11:44, 4 May 2008
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		+	#REDIRECT [[How stitching works]]
	== Introduction ==		== Introduction ==

← Older revision		Revision as of 23:37, 2 May 2008
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−	~~#redirect~~ [[~~Stitching 2008~~ State of the ~~Art~~]]	+	== Introduction ==
		+
		+	Stitching is about making one large image from several smaller photos.
		+	The ambition is to have the fact of individual ingredient photos no longer show through in the resulting image.
		+	This page shows what stitching software actually does.
		+
		+	If you want to know how to achieve this, or what
		+	[[software]] to use, please read a [[Tutorials\|tutorial]] instead.
		+	What can be done and what quality can be achieved,
		+	this shall be demonstrated step by step starting with the two photos below.
		+
		+	[[Image:Img08232.jpg\|300px]] [[Image:Img08231.jpg\|300px]]
		+
		+	At the time of photography, some [[Photography Guidelines\|guidelines]] have been followed that make the photos good stitching material.
		+
		+	----
		+
		+	For comparison to stitching proper, the two photos have simply been overlayed in a standard
		+	image editing and retouching software.
		+
		+	[[Image:Img0823xoverlay1.jpg\|300px]] [[Image:Img0823xoverlay2.jpg\|300px]]
		+
		+	Please notice in particular the misalignment of geometrical features in the left image,
		+	and the roof misorientation in the right one.
		+
		+	----
		+
		+	Have a look at the following aspects to see where proper stitching software can do better.
		+	Such software usually gives a choice of either performing these steps fully automatically,
		+	or provide assistance for optimisations without requiring a try-and-error workflow.
		+
		+	===Remapping===
		+
		+	[[Image:Img08232remap.jpg\|300px]] [[Image:Img08231remap.jpg\|300px]]
		+
		+	To project the images onto the same virtual screen, they need
		+	to be remapped, as shown above. Correcting falling lines as in this example
		+	is by choosing an appropriate orientation for the virtual screen.
		+
		+	[[Image:Img0823xstitch3.jpg\|500px]]
		+
		+	The relative camera orientation, and the lense parameters
		+	are determined from the images overlap area.
		+	Handheld photos are fine.
		+	If the photos have been taken from the same point,
		+	expect alignment accuracy of better than a pixel.
		+
		+	===Exposure===
		+
		+	[[Image:Img0823xstitch4.jpg\|500px]]
		+
		+	Input images need not have the same exposure, or white balance.
		+	Together with vignetting
		+	(images are darker in the corners than in the middle)
		+	the required corrections
		+	can be derived from images with a suitably large overlap area.
		+
		+	===Blending===
		+
		+	Obviously, there needs to be some kind of seam between the images,
		+	but one can do better than a hard seam line (used above)
		+	or a feathered transition that affects the image character.
		+
		+	[[Image:Img0823xstitch5.jpg\|500px]]
		+
		+	State of the art is a seam mechanism that behaves
		+	like a line for small details but averages for large scale features.
		+
		+	[[Image:Img0823xstitch6.jpg\|500px]]
		+
		+	In addition, the seam line should be placed intelligently
		+	to avoid cutting through objects (like cloud, car or bicycle)
		+	that have moved in the time between taking the images.
		+
		+	==Overall Result==
		+
		+	[[Image:Img0823xstitch6crop.jpg\|600px]]
		+
		+	This is the overall result, cropped to rectangular shape,
		+	for a state-of-the-art stitching of two photos.
		+
		+	[[Category:Info]]