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Slave 1 photogrammetry tests
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<blockquote data-quote="vfxsup64" data-source="post: 3682183" data-attributes="member: 75363"><p>Ahhh...one of my favorite subjects - photogrammetry.</p><p></p><p>When I was with the ANH Falcon a little over a year ago, I thought about how to deal with the issue of getting absolute scale references. Certainly donor kit parts are key but for a model on exhibit, inside a display case, the solution was right in front of me...measure the box it came in (or rather the display case surrounding the piece).</p><p></p><p>So, I very discretely palmed a small measuring tape and ran it along one of the long straight lengths of the display case and made sure a few of my overall picture samples included that side of the display case. Once I solved that edge in the overall photogram and 3D tracking solve, I had a large measurement data point to refer everything else to. A good compare to the inner donor kit parts - and a good way to minimize/average out measurement error.</p><p></p><p>Now, in lieu of possibly getting frowned upon by the local exhibit staff, one could have a friend stand next to the model, holding something of known measurement - a piece of notebook paper or a walking cane - something that is in view of the camera along with the model - some scale reference to relate everything else to!</p><p></p><p></p><p>(P.S. Make sure that the scale reference does <u>not</u> move between pictures - it must be a rigid part of the "monolithic" structure you are solving for...)</p><p></p><p></p><p></p><p>Regards, </p><p></p><p>Andre</p></blockquote><p></p>
[QUOTE="vfxsup64, post: 3682183, member: 75363"] Ahhh...one of my favorite subjects - photogrammetry. When I was with the ANH Falcon a little over a year ago, I thought about how to deal with the issue of getting absolute scale references. Certainly donor kit parts are key but for a model on exhibit, inside a display case, the solution was right in front of me...measure the box it came in (or rather the display case surrounding the piece). So, I very discretely palmed a small measuring tape and ran it along one of the long straight lengths of the display case and made sure a few of my overall picture samples included that side of the display case. Once I solved that edge in the overall photogram and 3D tracking solve, I had a large measurement data point to refer everything else to. A good compare to the inner donor kit parts - and a good way to minimize/average out measurement error. Now, in lieu of possibly getting frowned upon by the local exhibit staff, one could have a friend stand next to the model, holding something of known measurement - a piece of notebook paper or a walking cane - something that is in view of the camera along with the model - some scale reference to relate everything else to! (P.S. Make sure that the scale reference does [U]not[/U] move between pictures - it must be a rigid part of the "monolithic" structure you are solving for...) Regards, Andre [/QUOTE]
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