Pixel registration in Time Series Images

D
Posted By
Dafydd
Jan 3, 2004
Views
201
Replies
2
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Closed
I am working on a project comparing previous and current of urban and rural landscapes using old scanned photos and new digital images photographed from the estimated source of the original photos. I wish to register the known pixel locations on the old (scanned) photos with the same locations on the new images. The aim of this will be to resample and warp the new images to match their partner old images. This will then produce two identical image dimensions with matching cartesian coordinates and facilitate serious comparative examination of landscape change using 3-D work.

My query is does anybody know if Photoshop is capable of this, or of any other software which can undertake bitmap to bitmap pixel registration ? Photoshop gives the impression within its filters that it is capable of sub pixel measurement and if so its PSD files must have a deeper structure than just x and y pixel numbers.

The procedure I think will work is similar to the registration of air photos and satellite images (bit mapped data) on to digital maps ( vector data ). GIS packages such as ArcView can easily undertake this pixel registration of bitmap to vector data but alas they cannot undertake bitmap to bitmap data registration.

Any help or views would be appreciated – it maybe that PS is not the package for this, but I have yet to find any other.
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image pixel register series time

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Mike Russell
Jan 3, 2004
Dafydd wrote:
I am working on a project comparing previous and current of urban and rural landscapes using old scanned photos and new digital images photographed from the estimated source of the original photos. I wish to register the known pixel locations on the old (scanned) photos with the same locations on the new images. The aim of this will be to resample and warp the new images to match their partner old images. This will then produce two identical image dimensions with matching cartesian coordinates and facilitate serious comparative examination of landscape change using 3-D work.

My query is does anybody know if Photoshop is capable of this, or of any other software which can undertake bitmap to bitmap pixel registration ? Photoshop gives the impression within its filters that it is capable of sub pixel measurement and if so its PSD files must have a deeper structure than just x and y pixel numbers.
The procedure I think will work is similar to the registration of air photos and satellite images (bit mapped data) on to digital maps ( vector data ). GIS packages such as ArcView can easily undertake this pixel registration of bitmap to vector data but alas they cannot undertake bitmap to bitmap data registration.

Any help or views would be appreciated – it maybe that PS is not the package for this, but I have yet to find any other.

One method would be to set the images up as two layers, with the top layer transparent. Then change the view to get a gray margin around the picture, and select the top layer, and use free transform’s various alt and ctrl options to to line up appropriate points in the image. I would start with five points – four near the corners and a single point near the center. Liquify may also be useful, but I’ve found it to be a bit unstable for fine work.

For a more advanced solution to this problem, you may want to take a close look at Helmut Dersch’s warping tools. The emphasis is on panoramas, but there is a variety of material for warping and correlating images.

Download panotools.zip from:
http://home.no.net/dmaurer/~dersch/
and look closely at the readme.txt – there are several utilities there that may interest you for warping images based on manually created control points. Heavy going, but I believe there is enough functionality there to do the warping you need without having to write any code. In particular, there is a facility for correlating two images and generating z info. —

Mike Russell
www.curvemeister.com
www.geigy.2y.net
PF
Paul Furman
Jan 4, 2004
Dafydd wrote:
facilitate serious comparative examination of landscape change using 3-D work.

Are you talking about the program that creates 3d models based on stereo photo pairs? That is some cool stuff. I can’t recall the name of one I played with before (free demo)…

Mapping software is normally used for the matching work you are talking about though I think it would mess up the results for the above program. ArcInfo is a super big fancy program that GIS people use for this.

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