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patrikhuber / eos

A lightweight 3D Morphable Face Model library in modern C++
Apache License 2.0
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How does PCA works in eos. #54

Closed farazirfan47 closed 8 years ago

farazirfan47 commented 8 years ago

What is the role of PCA and why do we need to apply PCA shape and texture model in eos in just simple words.can you explain it in a non-mathematical way,I read about pca in data mining course and I understand it,but I want to know how does it works in eos and how does it apply on the 3D face scans? I strongly believe that

you do not really understand something unless you can explain it to your grandmother -- Albert Einstein

Well I can't explain it to layman

Can you explain it in simple words without using mathematical equations so that I will get the purpose of pca in eos as general........suppose that you are explaining this to a layman.

patrikhuber commented 8 years ago

The Blanz & Vetter 1999 paper is a nice introduction to PCA for 3D shape models. If you want something easier, you can check out this material: http://gravis.cs.unibas.ch/smiley/ Have a look at their Smiley Tool (works interactively in the browser) and the resources. It's a very simple PCA example.

There are also various resources to learn more about statistical shape modeling.

farazirfan47 commented 8 years ago

Thanks patrik I got it. I have one more confusion what this file sfm_shape_3448.bin contains is that morphable model or PCA model? I want to create full head model so I need to create my own binary file like this file sfm_shape_3448.bin which contains PCA or morphable model?

patrikhuber commented 8 years ago

Have a look at our VISAPP paper of what's in the model. There's also a diagram in there. You can also step through the code in the debugger and then just have a look at what got loaded and what's inside the MorphableModel class.

farazirfan47 commented 8 years ago

Thanks a lot for your help :)