diff --git a/topics/02_passive/index.md b/topics/02_passive/index.md index c70abe84059d9ed40635f5eadb6c8560a39f343f..126b94db850dd87ee1531ff2a42dcb080e0e9381 100644 --- a/topics/02_passive/index.md +++ b/topics/02_passive/index.md @@ -23,13 +23,12 @@ Photogrammetry was first documented by the Prussian architect [Albrecht Meydenba <img src="images/data_model_photogrammetry.png" alt="Data Model of Photogrammetry"> -### Accessibility Unlike other scanning methods that require precise orbital plans or specialized equipment, photogrammetry can be achieved simply by flying a drone in a circular pattern and capturing multiple photos. Utilizing the location data from the drone, one can construct detailed models like the example shown here: A typical medium resolution aerial photogrammetry scan of a barn. With 50-100 images a reasonably accurate model can be produced. Such models are often used in surveying and restoration projects from the scale of hand helf objects to cities. This accessibility makes photogrammetry an attractive option for various applications, with results that can be sufficiently accurate depending on the specific requirements. <img src="images/house_scanning.jpg" alt="House"> -### Markers + However, it's essential to note that photogrammetry lacks inherent scale. Without a reference point or prior knowledge of the camera locations, the resulting model lacks a definitive scale, as cameras inherently lack absolute scale information. Therefore, incorporating at least one reference point is crucial. For example, marking a facade with visual markers or known distances, such as pieces of tape, allows for scaling within a 3D modeling program based on these references. # Stereo Matching @@ -42,7 +41,7 @@ However, it's essential to note that photogrammetry lacks inherent scale. Withou While the analog versions of these techniques have waned in popularity, stereophotogrammetry still has applications for capturing dynamic characteristics of previously difficult to measure systems like running <a href="https://www.spiedigitallibrary.org/conference-proceedings-of-spie/8348/1/Dynamic-characteristics-of-a-wind-turbine-blade-using-3D-digital/10.1117/12.915377.short?SSO=1">wind turbines</a>.</p> -### When is it useful? +When is it useful? Photogrammetry is useful for outdoors settings, where all you need is a handheld camera and some patience. In this example, note the loss of quality towards the top, as pixel resolution becomes problematic: <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&utm_campaign=share-popup&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&utm_campaign=share-popup&utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Nicolas Diolez </a> on <a href="https://sketchfab.com?utm_medium=embed&utm_campaign=share-popup&utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;">Sketchfab</a></p></div> @@ -58,7 +57,7 @@ Depending on the end use application almost any camera will work given there is <p><img src="images/lidar_vs_photogrammetry_drone.jpg" alt="Drone imaging"></p> -# Key Challenges +#### Key Challenges #### ### 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. diff --git a/topics/04_mechanical/index.md b/topics/04_mechanical/index.md index ff9808946baf511192a575717fc52ff0e7b112ba..07eb5de0f122636c44d30407276f3554f9943bc6 100644 --- a/topics/04_mechanical/index.md +++ b/topics/04_mechanical/index.md @@ -67,6 +67,10 @@ Passive Robot Arm ### DIY +Universal Robots + + + DIY Projects <p><a href="http://blog.dzl.dk/2018/08/21/3d-digitizer/">Digitizer</a></p> @@ -76,6 +80,16 @@ DIY Projects # Large Scale +Add Dennis Shelden Dissertation content + +<img src="images/gehry_scanning_exterior_model.jpg" alt="Source: Gehry Technologies"> + ### Digital Templating +Add proliner + +<iframe width="560" height="315" src="https://www.youtube.com/embed/9dd1w9VAxw0?si=9kcd6ggq5RGd8YOL&start=67" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe> + ### Survey Prisms + +https://www.sumpoint.io/#services diff --git a/topics/04_mechanical/survey_prism_railroad.jpg b/topics/04_mechanical/survey_prism_railroad.jpg new file mode 100644 index 0000000000000000000000000000000000000000..9273ac1f5388b522280e8a16515addf09361ec70 Binary files /dev/null and b/topics/04_mechanical/survey_prism_railroad.jpg differ