computer science

PhotoModeler

PhotoModeler is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand PhotoModeler rather than just read about it. In short: PhotoModeler is a software application that performs image-based modeling and close range photogrammetry – producing 3D models and measurements from photography. The software is used for close-range, aerial and uav photogrammetry.

Key takeaways

PhotoModeler belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PhotoModeler to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PhotoModeler from memory before moving on to harder problems.

Reference excerpt

PhotoModeler is a software application that performs image-based modeling and close range photogrammetry – producing 3D models and measurements from photography. The software is used for close-range, aerial and uav photogrammetry. Close Range Photogrammetry (CRP) can mean photographs taken from the ground with a handheld camera, or taken from a UAV/drone at a relatively low altitude. PhotoModeler and CRP are used for performing measurement and modeling in agriculture, archaeology, architecture, biology, engineering, fabrication, film production, forensics, mining, stockpile volumes, etc.

How Photomodeler works 1) Take photos from different angles: Ensure that many images are taken to capture the entire object. The amount of required images varies accordingly to the size and complexity of the object being captured. 2) Load images into Photomodeler software: Upload the images by any means on to the computer. 3) Chose the method: Chose one amongst the four following options.

Manual marking: Marking and Referencing is the process of manually matching common features across multiple photos. Click on a distinct visual feature on one photo and match it to the same feature on other photos taken from different angles. Coded target detection: Photomodeler automatically detects applied or projected targets and solves for an accurate set of 3D points representing each target center. Coded targets provide the additional ability to reference targets between photos. The resulting points can be used for line, curve and surface modeling (and Surface Draw), or measurement and export as needed. Smartmatch/ DSM: Dense surface modeling tools are used to automatically detect and match features across multiple overlapping photos. The result is a dense point cloud that can optionally be triangulated/surfaced to form the shape. Projects built with DSM tools can be supplemented with traditional modeling features, such as points and lines. Smartmatch/ DSM-Aerial: Photomodeler UAS uses SmartMatch to automatically detect common features across overlapping aerial photos, allowing DMS to generate 3D point cloud models and surfaces. Models can be enhanced with wireframe line-work, ortho-photos, contours, volumes, geo-referencing, and more. 4) Review, measure, and export

Applications Some of the applications of PhotoModeler are:

Accident reconstruction / Forensics Archaeology / Paleontology Architecture Biology Engineering Fabrication and Manufacturing Film Mining Situational Awareness (SA)

See also Stereophotogrammetry 3D data acquisition and object reconstruction Image-based modeling and rendering Computer vision 3D scanner

Notes and references

Notes

Worked examples

Example 1 — a first encounter with PhotoModeler

Start with the simplest possible case. Write down what PhotoModeler claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to PhotoModeler before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about PhotoModeler ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of PhotoModeler

In research: PhotoModeler appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses PhotoModeler in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: PhotoModeler is common in secondary-school and first-year university syllabi. It links to neighbouring topics Photogrammetry software, so understanding it makes those chapters shorter.
In everyday life: Look for PhotoModeler outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study PhotoModeler in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PhotoModeler means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain PhotoModeler out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PhotoModeler in simple terms?

Why does PhotoModeler matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study PhotoModeler?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on PhotoModeler.