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    Here is how you can use PhotoMatch with cropped photos

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    • Alan FraserA Offline
      Alan Fraser
      last edited by

      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. 😉


      perspective.jpg

      3D Figures
      Were you required to walk 500 miles? Were you advised to walk 500 more?
      You could be entitled to compensation. Call the Pro Claimers now!

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      • DavidBoulderD Offline
        DavidBoulder
        last edited by

        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

        --

        David Goldwasser
        OpenStudio Developer
        National Renewable Energy Laboratory

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        • mitcorbM Offline
          mitcorb
          last edited by

          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?

          I take the slow, deliberate approach in my aimless wandering.

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          • DavidBoulderD Offline
            DavidBoulder
            last edited by

            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.

            --

            David Goldwasser
            OpenStudio Developer
            National Renewable Energy Laboratory

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            • mitcorbM Offline
              mitcorb
              last edited by

              Thanks, David. Your explanation clears that up for me.

              I take the slow, deliberate approach in my aimless wandering.

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              • E Offline
                efeme75
                last edited by

                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?

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                • DavidBoulderD Offline
                  DavidBoulder
                  last edited by

                  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.

                  --

                  David Goldwasser
                  OpenStudio Developer
                  National Renewable Energy Laboratory

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                  • E Offline
                    efeme75
                    last edited by

                    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?


                    Central point determination.jpg

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                    • DavidBoulderD Offline
                      DavidBoulder
                      last edited by

                      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.


                      annotated on top of image from last post

                      --

                      David Goldwasser
                      OpenStudio Developer
                      National Renewable Energy Laboratory

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                      • E Offline
                        efeme75
                        last edited by

                        Central point determination-1.jpgCentral point determination-2.jpgDear 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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