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360 Degree Panoramas with Straight Lines

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  • Helmut Dersch
    Some experiments to straighten cylindrical panoramas; useful for architecture/ especially with large vertical field of view. Essentially, we project the
    Message 1 of 7 , Jun 23, 2008
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      Some experiments to straighten cylindrical panoramas;
      useful for architecture/ especially with large vertical field of view.
      Essentially, we project the panorama onto an arbitrary
      closed-path 360degree-screen, and then display the flattened image.
      A cylindrical panorama uses a circular path, while in
      this experiment we can use straight segments to correctly
      display perspective lines. The segments are interconnected
      by splines leading to smooth transitions.

      I've recycled some of my old Marburg-panoramas:
      <http://www.fh-furtwangen.de/~dersch/mr/markt1.html>
      <http://www.fh-furtwangen.de/~dersch/mr/schloss1.html>
      <http://www.fh-furtwangen.de/~dersch/mr/pfarrout.html>

      Regards

      Helmut Dersch
    • Dave 360texas.com
      Hello Professor, we are using IE 7 and are having difficulty viewing your .jpg images. We just see html text on the screen. Could it be because the .jpg file
      Message 2 of 7 , Jun 23, 2008
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        Hello Professor,

        we are using IE 7 and are having difficulty viewing your .jpg
        images. We just see html text on the screen.

        Could it be because the .jpg file name src="schloss1.mr.jpg" has too
        many ellipses schloss1 . mr . jpg ??

        --- In PanoToolsNG@yahoogroups.com, "Helmut Dersch" <der@...> wrote:
        >
        > Some experiments to straighten cylindrical panoramas;
        > useful for architecture/ especially with large vertical field of
        view.
        > Essentially, we project the panorama onto an arbitrary
        > closed-path 360degree-screen, and then display the flattened image.
        > A cylindrical panorama uses a circular path, while in
        > this experiment we can use straight segments to correctly
        > display perspective lines. The segments are interconnected
        > by splines leading to smooth transitions.
        >
        > I've recycled some of my old Marburg-panoramas:
        > <http://www.fh-furtwangen.de/~dersch/mr/markt1.html>
        > <http://www.fh-furtwangen.de/~dersch/mr/schloss1.html>
        > <http://www.fh-furtwangen.de/~dersch/mr/pfarrout.html>
        >
        > Regards
        >
        > Helmut Dersch
        >
      • Flemming V. Larsen
        typo-error on all image-tags on the pages
        Message 3 of 7 , Jun 23, 2008
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          typo-error on all image-tags on the pages

          <img src="schloss1.cyl.jpg" width="80%" ">

          should have been

          <img src="schloss1.cyl.jpg" width="80%">

          - Flemming
        • Sacha Griffin
          That s interesting. Something, I asked about 3 or 4 years ago. There s a popular series of 360 books that all display the cylindricals in this fashion, but I
          Message 4 of 7 , Jun 23, 2008
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            That's interesting. Something, I asked about 3 or 4 years ago.

            There's a popular series of 360 books that all display the cylindricals in
            this fashion, but I imagine they were done in a manual transform photoshop
            type fashion.



            So what would the work flow be here, for the layperson?





            Sacha Griffin

            Southern Digital Solutions LLC

            http://www.southern-digital.com

            http://www.seeit360.net

            404-551-4275







            From: PanoToolsNG@yahoogroups.com [mailto:PanoToolsNG@yahoogroups.com] On
            Behalf Of Helmut Dersch
            Sent: Monday, June 23, 2008 1:16 PM
            To: PanoToolsNG@yahoogroups.com
            Subject: [PanoToolsNG] 360 Degree Panoramas with Straight Lines



            Some experiments to straighten cylindrical panoramas;
            useful for architecture/ especially with large vertical field of view.
            Essentially, we project the panorama onto an arbitrary
            closed-path 360degree-screen, and then display the flattened image.
            A cylindrical panorama uses a circular path, while in
            this experiment we can use straight segments to correctly
            display perspective lines. The segments are interconnected
            by splines leading to smooth transitions.

            I've recycled some of my old Marburg-panoramas:
            <http://www.fh-furtwangen.de/~dersch/mr/markt1.html>
            <http://www.fh-furtwangen.de/~dersch/mr/schloss1.html>
            <http://www.fh-furtwangen.de/~dersch/mr/pfarrout.html>

            Regards

            Helmut Dersch





            [Non-text portions of this message have been removed]
          • Helmut Dersch
            ... I wrote an extension to PTStitcher. With this you start with an equirect./cyl. source panorama, then set segment-boundaries (horizontal pixel positions)
            Message 5 of 7 , Jun 23, 2008
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              --- In PanoToolsNG@yahoogroups.com, "Sacha Griffin" <sachagriffin@...>
              wrote:
              >
              >
              > So what would the work flow be here, for the layperson?
              >
              >

              I wrote an extension to PTStitcher. With this you
              start with an equirect./cyl. source panorama, then set
              segment-boundaries (horizontal pixel positions)
              and segment-yaws (also horizontal pixel positions),
              and finally transition widths (again in pixels).
              The examples use between 6 and 9 straight segments.

              This is a very flexible scheme allowing the user
              to create countless versions of a panorama with quite
              different characteristics, eg perspective corrections
              ala shift lens can be (and in the examples are) applied
              to each segment, etc.


              H. Dersch

              ps: typos corrected and images renamed to make IE happy.
            • Bernhard Vogl
              Helmut thanks - this is a very useful feature. This even makes my question for an anamorphic projection obsolete. I noticed in your examples that the outer
              Message 6 of 7 , Jun 24, 2008
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                Helmut thanks - this is a very useful feature. This even makes my question for an "anamorphic" projection obsolete.

                I noticed in your examples that the outer image regions still look distorted like with a wideangle lens. Is it technically possible to "center" each segment to minimize distortions?

                Best regards
                Bernhard
              • Helmut Dersch
                ... distorted like with a wideangle lens. Is it technically possible to center each segment to minimize distortions? ... Yes, this is the default. To me this
                Message 7 of 7 , Jun 24, 2008
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                  --- In PanoToolsNG@yahoogroups.com, "Bernhard Vogl" <bvogl@...> wrote:
                  >
                  > I noticed in your examples that the outer image regions still look
                  distorted like with a wideangle lens. Is it technically possible to
                  "center" each segment to minimize distortions?
                  >

                  Yes, this is the default. To me this looked somewhat dull, so I tilted
                  the border segments.

                  Regards

                  Helmut Dersch
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