RoboRealm Forum

No Title

Tue, 30 Nov 1999 00:11:00 EST

almost forgot the robo file :P

anser

Tue, 30 Nov 1999 00:11:00 EST

there is a function in roborealm for that! its in th transforms subfolder an is called affine. how to use it: drag the squares over the corners of you tabletop this will cause the tabletop to apear straight

Camera transform

Tue, 30 Nov 1999 00:11:00 EST

I believe this is called a -camera transform-. Don't have any links but this function is used all over the 3-D graphics world...good luck

No Title

Tue, 30 Nov 1999 00:11:00 EST

Here is a photo...

Took an 11 inch piece of paper and marked 0, 11, and 5 1/2 inch marks.

The photo was taken from a camera 7 inches vertical above the plane of the paper, and 51/2 inches "behind" the paper (behind the 0 mark).

I'm looking for a piece of software or macro or set of formulas which will automatically estimate the X.Y coordinates of any given "dot" on that white paper, reletive to the edges of the paper itself, by reading and translating the X,y coordinates in a 640X480 snapshot. This will need to take into account:

- the size of the photo
- perspective distortion of coordinates
- the angle of the camera reletive to the plane.

I'm not going to try develop such a formula myself from scratch starting with Trig...that would be a waste of time. I'm sure it exists in a zillion different places, and I don't mind paying for it. But don't know which search terms to use to find it.

Thanks!

No Title

Tue, 30 Nov 1999 00:11:00 EST

See attached link

http://www.mathsrevision.net/gcse/pages.php?page=39

Calvenn

How to calculate coordinates for angled view of surface??

Tue, 30 Nov 1999 00:11:00 EST

Hello all,

I have what I think should be a simple problem...except I'm not handy with Trigonometry.

I'm taking a photo of a tabletop from about 12" above it, not directly above but from the corner.  Imagine a camera hovering 12 inches above the right hand corner of a kitchen table, pointing down.

I know the angle of the camera reletive to the tabletop.  I want to be able to look at the photo and from the X,Y location on the photo, interpolate the X,Y, and Z location in real life.

Does anybody know the formulas for converting x,Y locations on a JPEG into X,Y,Z coordinates?  Is there a good website or book that has details on this sorta thing?

Thanks for any advice,

Tom