jena_2015_photogrammetry part 3 photoscan workflow

7/26/2019 Jena_2015_photogrammetry Part 3 Photoscan Workflow

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A HANDS-ON INTRODUCTION TO AGISOFT PHOTOSCAN

Why Agisoft Photoscan?

very robust software in constant development (there

are plus and minus sides to this)

cheap (relatively)

everyone is using it

http://www.agisoft.ru/ Software download and purchase

User manuals and tutorials

Discussion forum

Note:

alternatives exist, both free and

commercial


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BEWARE:photogrammetric processing is VERYresource-intensive!

CPU

software is mostly multi-threaded and benefits from multi-core and multi-processor setups

brute-force approach: faster is better, as simple as that

see Anandtech.com for CPU benchmarks with Photoscan

GPU purpouse-built chip for doing fast geometrical calculations for 3D graphics display

modern software can offload complex calculations to GPU via CUDA or OpenCL

Photoscan utilizes GPU via OpenCL for dense point cloud computation

for Photoscan, ATI is currently better than NVIDIA (superior OpenCL implementation)

high-frequency gaming cards beat professional CAD cards and are cheaper to boot

eventually you will also need fast 3D accelerated graphics for displaying your models(!)

RAM (memory)

single biggest bottleneck in Photoscan use

program will simply crash when it runs out of RAM

RAM requirements positively correlate with number of images and their resolution

can be offset somehow by splitting the project in parts (chunks)

HARDWARE REQUIREMENTS


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Memory requirements guidelines from Photoscan Wiki:

Photo alignement stage

Building the model from 12 Mp photos (resolution- and model quality dependent)

Decimation of triangles

HARDWARE REQUIREMENTS (CONTINUED)


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1. For full functionality, enter the 30-day evaluation license (Help/Activate product)

2. If your computer is OpenCL compatible, adjust the number of active CPU cores3. Set Advanced options (if desired)

PROGRAM SETUP


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1. Add photos (cameras) to be used in reconstruction

2. You may add masks to exclude unwanted picture elements3. You may enable/disable photos at any stage of processing

WORKFLOW STEP 1 ADD PHOTOS...


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1. This will calculate camera positions and pose, and produce sparse point cloud

2. Adjust parameters, OK, and wait for the results...

WORKFLOW STEP 2 ALIGN PHOTOS


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1. Only the points within the box are used in further processing steps!

2. Note that the red plane will be the bottom plane of the finished model.

WORKFLOW STEP 3 REFINE BOUNDING BOX POSITION


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1. This will produce the dense point cloud from your image data

2. Set the processing parameters and hit OK. Then wait

WORKFLOW STEP 4 BUILD DENSE CLOUD


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1. This will produce triangular surface mesh model

2. Set the processing parameters and hit OK. Then wait some more

WORKFLOW STEP 5 BUILD MESH


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1. This will create photo texture and project it onto the surface model

2. Set the processing parameters and hit OK. Then again wait

WORKFLOW STEP 6 BUILD TEXTURE


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1. Congratulations! You just created your first photogrammetric model!

2. Spend some time rotating and exploring the model.

WORKFLOW STEP 7 ENJOY PLAYING WITH YOUR MODEL

jena_2015_photogrammetry part 3 photoscan workflow

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