Marcus may have meant calibrated "pinhole" instead of fisheye. This is the approach we're using where we click on points in the photo and then corresponding points in google earth plugin. With 7 points we then solve for the pinhole camera parameters. Or, in the case that the image is from cell phone, we can get the a rough gps location and a focal length from the EXIF meta data. If a custom app is deployed, the compass and gryo can be added to custom fields in the EXIF.
To relate two images with corresponding non-planar points, we'll be calculating the fundamental matrix to help with the 3D geometry. More at: http://en.wikipedia.org/wiki/Fundamental_matrix_(computer_vision) And better yet, lyrics and video for the Fundamental Matrix song at: http://danielwedge.com/fmatrix/ On Tue, Jun 18, 2013 at 12:47 AM, Roger Critchlow <[email protected]> wrote: > On Mon, Jun 17, 2013 at 2:00 PM, Marcus G. Daniels <[email protected]> > wrote: > >> On 6/17/13 1:48 PM, Roger Critchlow wrote: >> >> Seems like it should be a standard cell phone camera surveying >> application to compute the angular altitude of an object above the horizon >> and the range of possible linear altitudes given the range of visible >> distances along the azimuth. >> >> Wouldn't it be necessary in general to do Photosynth and/or have a > calibrated fisheye lens? > > Why? Point the camera at the object in question, if you can get an > accurate pose for the camera plane, then the rest is classical surveying > geometry and classical optics. Getting a full panoramic image doesn't > locate the object of interest any better, just all the objects of > non-interest. > > -- rec -- > > > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >
============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com
