Here is how you can use PhotoMatch with cropped photos
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The picture book version. I'm assuming that you can have the image any size/proportion you like, as long as the all-important centre of perspective is smack in the middle.
Jakob, those of us who attended Basecamp 1 and saw David demo Photomatch before it's launch (except it wasn't called Photomatch back then) already know who he is.
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Sorry I missed the 2011 activity here. It is a shame that in 2013 I still can't have auto-calibrated photo match scenes that work with any photo
Alan, your drawing describes the technique much more clearly.
David
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I must be missing something in establishing the start point for the uncropped outline. The bottom is coincident with the bottom of the image, but how is the left side established?
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You could just keep it coincident with the left as well. In Alan's drawing he might have just been trying to maintain the same aspect ratio as his starting photo.The main goal is to re-center the image. You can't really tell how much of the original photo was cropped, just that it was cropped in a way that moved the center. This technique just expands one or two of the for sides to re-create the original center point.
If you took a good photo and cropped x" off both the left and the right, and then y" off the top and bottom MatchPhoto would work fine. The real problems are introduced when you crop X" from the left and Y" from the right.
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Thanks, David. Your explanation clears that up for me.
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Hi David,
Does your method work with any kind of photographs, or are there limitations to the orientation of the camera vs. horizon?
Did you continue to work on the subject? -
efeme75 I have not done anything this this in a while, although there are more photogrammetry and LIDAR based options out now that may be more automated that PhotoMatch. With the approach from this thread, the orientation of the photo relative to the horizon doesn't matter, but it does require an orthogonal object in the scene large enough to find vanishing points, and create perpendicular lines as shown in Alan's example.
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Dear David,
Pursuant to my last message, please find illustrations of your method in 4 cases (the edge colors are identical to the ones in Alan's attachment). In the first one (upper left uncropped image), the parallelepiped box is centred, and the resulting Central Point as well. In all other cases where the box is not centred in the uncropped image, the resulting Central Point is not in the centre of the image... Any thoughts?
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Its a little hard to work with the small thubnails but the bottom two phots pretty clearly have misplaced vertical vanishing point. The top right is a big tricker to tell, with the camera plane seemingly in line with the top of the box, very small movement in the left or right vanishing point will swing the magenta line form vertical vanishing left or right. In three of the photos I've added new yellow vanishing point triangle, and new magenta lines perpendicular to the horizons. I've added while ring where the magenta lines cross.
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Dear David, Thousand apologies, my sloppiness and Sketchup's inferences caused the inaccuracies of my initial central point's graphical determination (see corrected drawing). In a second attachment, the superposition of the original photograph (magenta edge), the yellowish cropped image), the greenish reconstructed uncropped photo show the usefulness of the method. Since I am dealing with 1900 photos, LIDAR and other techniques aren't really helpful here... Many thanks for diving in after so many years!
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