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    Here is how you can use PhotoMatch with cropped photos

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    • DavidBoulderD Offline
      DavidBoulder
      last edited by

      Well, making things vertical isn't really enough. See Picture 6 attached. If you also play with the horizontal perspective to get the horizon level at the same time and the verticals, and then you adjust the canvas size to get the horizon in the center, then you can do it this way; see Picture 7 for screenshot after additional adjustments. But that is also a lot of work, and requires distortion of source image. The method I used just expands the canvas, and doesn't degrade the image.

      My test image on previous post was not cropped. It was a test image where I know the center, but the method I used to find it doesn't rely at all on the edges of the photo. If you do same analysis on small piece of the image, you will find the same center, may even be off the edge of the photo.


      Just making verticals vertical


      also adjusting horizontal perspective to get horizon level, and centering it vertically on the canvas.

      --

      David Goldwasser
      OpenStudio Developer
      National Renewable Energy Laboratory

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      • pilouP Offline
        pilou
        last edited by

        I don't understand
        What importance if the sides are deformed, house on the middle is ready for the photo match 😒

        Frenchy Pilou
        Is beautiful that please without concept!
        My Little site :)

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        • DavidBoulderD Offline
          DavidBoulder
          last edited by

          I don't care so much what the edges are like. The point I was making, is that my goal of my process was to be able to find the center of the photo without just measuring to the middle from the sides. I find the center purely on geometric markers. This allows me to see if a photo was cropped and which sides.

          The less re-sampling of your source photo, the better. SketchUp is already going to have to re-sample the photo (when applied to surfaces), no reason to have Photoshop do it as well.

          For photos where your aren't looking up or down (parallel verticals) I do need to do a little more research. While I thought I resolved it and modeled geometry looks OK, I have my thoughts that maybe not accounting for side cropping correctly could affect measurements on the building.

          By the way, I also believe it should be pretty easy to model one point perspective. I'll post on that another time.

          --

          David Goldwasser
          OpenStudio Developer
          National Renewable Energy Laboratory

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          • plot-parisP Offline
            plot-paris
            last edited by

            dear, DavidBoulder. please don't read the following! I want to spread some rumour about you...
            if you do read this, please do not comment - I want to keep my believe, that my guess is true 😉

            so, here we go:

            DavidBoulder does not give any information about himself, no name, no place of residence, nothing.

            David is obviously his first name. but Boulder, Colorado is the location, where the Google programmers are working on the new SketchUp version!

            David seems to have spent a great deal of thought about the photomatch tool in SU.

            he refers to the new SketchUp version (what could be in there...)

            @davidboulder said:

            I'm hoping to not find the need for this in SU7, and also hopping for mostly automated calibration as well. Maybe also option for telemetry based solution to work with non-square and non-adjacent geometry.

            regarding all this information my conclusion is:

            David is working on the new photomatch tool for SketchUp. he is (indirectly) asking for help at SCF, for new ideas, wishes and possibilities.

            so everything we post here, will be found (if possible to achieve) in the new SketchUp release! so lets put all our desires (like a flexible multi-pin photomatch system) in this thread, with loads explanations as how to achieve this (to make Dave's life easier)...

            oh, I love spreading unfounded rumour! 😍

            sorry DavidBoulder, I just had to...

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            • thosfordT Offline
              thosford
              last edited by

              @davidboulder said:

              By the way, I also believe it should be pretty easy to model one point perspective. I'll post on that another time.

              David,

              Were you ever able to figure out how to photo match a one point perspective?

              I did a quick search but couldn't find anyone with a solution.

              Thanks,

              Todd

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              • mitcorbM Offline
                mitcorb
                last edited by

                @Todd:
                You just unearthed an ancient thread that has mentions of things being wished for in Sketchup 9.

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

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                • DavidBoulderD Offline
                  DavidBoulder
                  last edited by

                  @thosford said:

                  @davidboulder said:

                  By the way, I also believe it should be pretty easy to model one point perspective. I'll post on that another time.

                  David,

                  Were you ever able to figure out how to photo match a one point perspective?

                  I did a quick search but couldn't find anyone with a solution.

                  Thanks,

                  Todd

                  Kind of, although not quite a one point perspective. If you have a situation like a main street where you have a bunch of connected facades where you only see the front of the building, but not the sides; I have a solution. Take a picture, but not straight on, shoot the photo off to the side a little so you have an x or y vanishing point. So how to you get a second vanish point? you cheat, Tilt the camera up or down so the z vanishing is your second one. To get this to work in Match Photo, before you import your photo, setup a special axes setup where you take the blue axis that is normally vertical and set it instead for your unknown x or y. Then that x or y axis becomes vertical z axis for your photo match scene. In essence if you turn your photo 90 degree sideways, it is like a normal old match photo. You are just changing which Axis Sketchup determines for you without having to really having to rotate your photo. This same technique allows you to use Match Photo on a building that doesn't have any 90 degree angles in plan, however you now need walls that are vertical, which should cover most buildings, but certainly not all. I don't have a tutorial up now, but I can try to make one when I get a chance.

                  --

                  David Goldwasser
                  OpenStudio Developer
                  National Renewable Energy Laboratory

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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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