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Commit eef97e2b authored by Danny Griffin's avatar Danny Griffin
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re-organizing passive

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...@@ -47,21 +47,21 @@ Photogrammetry is useful for outdoors settings, where all you need is a handheld ...@@ -47,21 +47,21 @@ Photogrammetry is useful for outdoors settings, where all you need is a handheld
<div class="sketchfab-embed-wrapper"> <iframe title="Arc de Triomphe - photogrammetry" frameborder="0" allowfullscreen="" mozallowfullscreen="true" webkitallowfullscreen="true" allow="fullscreen; autoplay; vr" xr-spatial-tracking="" execution-while-out-of-viewport="" execution-while-not-rendered="" web-share="" src="https://sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/embed"> </iframe> <p style="font-size: 13px; font-weight: normal; margin: 5px; color: #4A4A4A;"> <a href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Arc de Triomphe - photogrammetry </a> by <a href="https://sketchfab.com/nicolasdiolez?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Nicolas Diolez </a> on <a href="https://sketchfab.com?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;">Sketchfab</a></p></div> <div class="sketchfab-embed-wrapper"> <iframe title="Arc de Triomphe - photogrammetry" frameborder="0" allowfullscreen="" mozallowfullscreen="true" webkitallowfullscreen="true" allow="fullscreen; autoplay; vr" xr-spatial-tracking="" execution-while-out-of-viewport="" execution-while-not-rendered="" web-share="" src="https://sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/embed"> </iframe> <p style="font-size: 13px; font-weight: normal; margin: 5px; color: #4A4A4A;"> <a href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Arc de Triomphe - photogrammetry </a> by <a href="https://sketchfab.com/nicolasdiolez?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Nicolas Diolez </a> on <a href="https://sketchfab.com?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;">Sketchfab</a></p></div>
# Key Benefits Key Benefits
### Unified Workflow 1. Unified Workflow
Geometry and texture/color in one workflow. Geometry and texture/color in one workflow.
### Affordability and flexibility. 2. Affordability and flexibility.
Depending on the end use application almost any camera will work given there is enough light and your post processing software is robust. Depending on the end use application almost any camera will work given there is enough light and your post processing software is robust.
### Real Time Feedback & Processing* 3. Real Time Feedback & Processing*
*as models improve. [Ingenuity Drone](https://mars.nasa.gov/technology/helicopter/#) relies on photogrammetry-based onboard processing for ground distance estimation, showcasing the efficacy of passive sensing approaches in complex environments. *as models improve. [Ingenuity Drone](https://mars.nasa.gov/technology/helicopter/#) relies on photogrammetry-based onboard processing for ground distance estimation, showcasing the efficacy of passive sensing approaches in complex environments.
<p><img src="images/lidar_vs_photogrammetry_drone.jpg" alt="Drone imaging"></p> <p><img src="images/lidar_vs_photogrammetry_drone.jpg" alt="Drone imaging"></p>
#### Key Challenges #### Key Challenges
### Lighting 1. Lighting
Light conditions in the scene are crucial to the quality of the scan. A controlled environment is highly preferred. Precision is improving but can still be completely thrown off by certain light conditions in much the same way LiDar struggles with smooth surfaces. Light conditions in the scene are crucial to the quality of the scan. A controlled environment is highly preferred. Precision is improving but can still be completely thrown off by certain light conditions in much the same way LiDar struggles with smooth surfaces.
### Precision Limitations 2. Precision Limitations
Increasingly industry pairs vision systems for photogrammetry with laser systems to balance the benefits of both. Increasingly industry pairs vision systems for photogrammetry with laser systems to balance the benefits of both.
...@@ -71,20 +71,16 @@ Light conditions in the scene are crucial to the quality of the scan. A controll ...@@ -71,20 +71,16 @@ Light conditions in the scene are crucial to the quality of the scan. A controll
[AliceVision](https://alicevision.org/) Open-source photogrammetric computer-vision framework<br> [AliceVision](https://alicevision.org/) Open-source photogrammetric computer-vision framework<br>
[Meshroom](https://github.com/alicevision/Meshroom) is the 3D Reconstruction Software built on AliceVision [Meshroom](https://github.com/alicevision/Meshroom) is the 3D Reconstruction Software built on AliceVision
### Industry Standard ### 3D Software Suites
[Autodesk ReCap](https://www.autodesk.com/products/recap/overview?term=1-YEAR)<br> [Autodesk ReCap](https://www.autodesk.com/products/recap/overview?term=1-YEAR)<br>
[Agisoft Metashape](https://www.agisoft.com) [Agisoft Metashape](https://www.agisoft.com)
[Pix4D](https://www.pix4d.com/blog/machine-learning-meets-photogrammetry) - Uses ML for improving accuracy while scraping information on the contents of photogrammetry data sets.
### ML - Powered
<a href="https://www.pix4d.com/blog/machine-learning-meets-photogrammetry">Pix4D</a>
<p>Improving accuracy while scraping information on the contents of photogrammetry data sets.</p>
### Apps ### Apps
iPhone and Android apps for photogrammetry and now LiDAR scanning have multiplied over the last several years: iPhone and Android apps for photogrammetry and now LiDAR scanning have multiplied over the last several years:
[Scan the World](https://www.myminifactory.com/scantheworld/)<br> [Polycam](https://poly.cam/)<br>
[Rekrei](https://projectmosul.org/)<br> [Rekrei](https://projectmosul.org/)<br>
[Adobe Aero](https://www.adobe.com/products/aero.html)<br> [Adobe Aero](https://www.adobe.com/products/aero.html)<br>
[ScandyPro](https://www.scandy.co/apps/scandy-pro)<br> [ScandyPro](https://www.scandy.co/apps/scandy-pro)<br>
...@@ -92,9 +88,15 @@ iPhone and Android apps for photogrammetry and now LiDAR scanning have multiplie ...@@ -92,9 +88,15 @@ iPhone and Android apps for photogrammetry and now LiDAR scanning have multiplie
<img src="images/bellus.jpg" alt="Bellus"> <img src="images/bellus.jpg" alt="Bellus">
[Scan the World](https://www.myminifactory.com/scantheworld/)<br>
[Quixel Megascans](https://quixel.com/megascans)
# Camera Properties
# Camera Equations Creality Ferret Pro
Iphone 13
<p>Intrinsics and extrinsics parameters</p> <p>Intrinsics and extrinsics parameters</p>
<p><a href="https://en.wikipedia.org/wiki/Levenberg%E2%80%93Marquardt_algorithm">Levenberg–Marquardt algorithm</a> or damped least-squares algorithm (dls) are used to minimize the error across 3d coordinates. This procedure is typically called <a href="https://en.wikipedia.org/wiki/Bundle_adjustment">bundle adjustment</a>.</p> <p><a href="https://en.wikipedia.org/wiki/Levenberg%E2%80%93Marquardt_algorithm">Levenberg–Marquardt algorithm</a> or damped least-squares algorithm (dls) are used to minimize the error across 3d coordinates. This procedure is typically called <a href="https://en.wikipedia.org/wiki/Bundle_adjustment">bundle adjustment</a>.</p>
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