re-organizing passive

topics/02_passive/index.md

@@ -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>
 
 
-# Key Benefits
-### Unified Workflow
+Key Benefits
+1. Unified 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.
-### 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.
 
 <p><img src="images/lidar_vs_photogrammetry_drone.jpg" alt="Drone imaging"></p>
 
-#### Key Challenges ####
-### Lighting
+Key Challenges
+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.
 
-### Precision Limitations
+2. Precision Limitations
  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
 [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
 
-### Industry Standard
+### 3D Software Suites
 
 [Autodesk ReCap](https://www.autodesk.com/products/recap/overview?term=1-YEAR)<br>
 [Agisoft Metashape](https://www.agisoft.com)
-
-### 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>
-
+[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.
 
 ### Apps
 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>
 [Adobe Aero](https://www.adobe.com/products/aero.html)<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
 
 <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><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>