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|Christian Bauer; 10/2001|
So... .you want to know how you can create a panorama from three images taken with an fisheye?
First let me point you to a problem:
A company have a professional Camera/Softwaresystem which creates spherical panoramas also from fisheyeimages. This company have a very offensive habit against companies or softwaredeveloper which sells or give away software for free which are able to do the same without pay for a professional camerasystem based on a per image license ...they try to sue them because of a patent they have in the states!
It was not possible for me to find a description of this patent on their webpage to know if i'm on their list if i USE panotools, so i will not give you the name or link of this company ,but only the information thet there IS an issue. ..well... free market. :( .......
infos / International Quicktime VR Association statement
well... let's start with the tutorial and forget about that e-comerce crap!
This tutorial guides you through the steps to create a spherical Panorama from three images, taken with an fisheye lens and a seperation of 120° ...it would also work with only two images (180°) but.. eh .. i'm the quick and dirty guy who haven't time to photograph very exactly!..so i need always three images to get good results ....ich bin extrem schlampig!
So we have three images which can be downloaded
here. it also includes the scriptfile we will create in this tutorial.
We also need Sun JAVA 1.3 and the Panotools from Helmut Dersch....to install read the instructions of the products.
What we mainly need is the PTpicker. It's a java applet which works on Linux, MAC and Windows (it's java not .net!)
To start the applet i have a batchfile which expands the memorylimit from 32mb (which is not enough if you have three RGB images at a size of 1024x1024) to 192mb (which you *should* have)
run.bat = " java -Xmx192m -jar ptpicker.jar"
Let's start and fire up that little jewel and create a new Panorama
There is everything clear ...we want to output to a photoshop file, we have a fisheye projection, the focal lens is 7.7 mm (depends on your fisheye) and we have three images!
There is a menu called Left Image and a menu called Right Image.. we need that
menus to load images to the left or right window and set controllpoints, but
first we have to load the images don't care where the image will be shown, we
can change that
I usualy start with image one on the left windows and image two on the right windows. I then click into one image to set a controlpoint and drag it on the other images to the correct position. You also can see that i use only few points which are in a mainly vertical pattern....this is because of the way panottols expect controlpoints to optimize!
Colors of the points:
RED- active controlpoint
GREEN- controlpoint which is on both shown images
BLUE- controlpoint which have it's equal on a image which is not shown
Then i change the right imgage to image 3 and insert again controlpoints.
..and the last step will be chaging the left image to image 2 and insert points.
We now have controlpoints on every image :
1:2 -> 1:3 -> 2:3
And now we have to optimize the controlpoints..we first run optimizer
Now the panoramatools correct the orientation of the images to fit to the controlpoints, but normaly you have some points to correct. for this reason we can look at the script
this is the text file which will be generated by optimizer:
scroll down a little bit to find the lines where optimizer gives you the Distance
between expected and real position of the controlpoints....
Well, hmm.. biggest difference of 6 px .... hmm...this would be ok for me.... *g*
..maybe not for you! ....normaly you should try to get a difference of less than 2-3px and so you have to optimize the panorama a little bit.
first you have to find the points (...no, there is no way to show the pointnumbers on the gui)
A box pops up and ask you for the pointnumber. Now PTSticher will find the point for you , opens the images where the points are and lighten the controlpoints RED. This is the point you have to move around and try to enhance the preceision. It's possible that this point can't be optimized because of it's extreme position ( next to the imageborder or a very high tilt value)
In some cases you only have to delete the controlpoint and get a better result.
Anyway if you have changed something you have to run optimizer again and have again a look at the script.
If everything works well you can run the stitcher
This will output an photoshopfile with three masked layers:
You can see some errors on the sky and on the floor. ...well as i told you ..Phaa! ..difference of 6px is no problem to me... i just paint the errors away! ;)
activate the airbrush and paint on the masks of L03 the left areas in the sky away then on L02 the right areas... wasn't that difficult..we only corrected the missing controlpoints in the sky.
Now the floor.... time to clone! ..i always create a layer and clone the areas to this layer and also create a gradient where the tripod stand.
If you want to have a really perfect panorama, which have a correct floor and sky you also have to photograph this images.
well ..have a closer look at the image and look if it's ok ...
hmm ..time to say sh** !!!!
..go back to PTstitcher and add some controlpoints.... did i said it? ..sh**!
..oh ..i got some mails about a little problem .. when you have problems opening/running the scriptfile by stitcher , then try to save the files with the .txt extension
any comment : email
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