Wolfgang Hugemann on wrote...
| No question this time, just praise for IM:
|
| I have just tested the newly implemented perspective distorsion feature
| and found it exactly what I need. I work in accident recontruction and
| quite often I have to map automobile damage caught in a perspectively
| distorted image onto a plan parallel taking of a car of the same make
| and model.
|
| This is very tedious work with all other programs I know in this
| respect. But with IM's new perspective distortion tool this is very
| rapid: just measure the co-ordintes of four points in the perspectively
| imperfect photo and the co-ordinates of their match points in the plane
| parallel taking and then IM do its job. Great!
|
| We used to peform this task by the help of the "-fx" operator and a
| VB-Script, but IM's calculation of the perspective correction used to
| take quite a while with this older way of proceeding.
|
| Greetings from Germany
| Wolfgang Hugemann
|
| P.S.: I will soon provide Anthony with an convincing example.
Glad you found it useful. A small example, would be great for this.
When I get time to work on code again, I will also be using my new-found
knowledge of resize filters (including a re-write of the 'Resize' pages
of IM examples) to try and improve the quality of the low-level general
distortion filters.
At the moment output is a little 'fuzzy' due to the use of the 'default'
Gaussian Filter the original 're-sampling' algorithm used.
The ETA on this however is unknown, as I have been force to work on
other projects.
NOTE: You can use more tham 4 coordinates (point registrations) to
determine the perspective distortion. These will be least-squares
fitted into the transformation coefficients, so if the multiple points
are good, you will get an more accurate (sub-pixel accuracy) for the
distortion.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Just don't create a file called "-rf" :-) -- Larry Wall
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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