Computer Vision at Universität Stuttgart | Flashcards & Summaries

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Lernmaterialien für Computer Vision an der Universität Stuttgart

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Advantages and drawbacks of PW?

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Advantage: 

  • no assumption about prior needed
  • works for non-parametric distributions (multi-modal..)

Disadvantages:

  • requires lots of data
  • difficult to determine expedient kernel size
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Whats second-order statistics?

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incorporating the neighbourhood context 

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List some major application of SIFT:

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1. estimation of global relations between images (stereo geometry, homographics..)


2.) tracking 


3.) structur from motion


4.) object detection and pattern recognition

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What are the main benefits of Gaussian pyramids?

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1.) Solving problems in a coarse to fine manner accelerates most algorithms.


2.) Much more memory efficient as scale-spaces due to the downsampling step

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Whats the kurtosis and skewness of a Gaussian?

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both 0

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Are voxels usually cubic?

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No, the voxel dimensions usually differ in different directions. However, pixels are mostly squared.

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Is 1 byte sufficent for the co-domain discretisation?

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Yes. As a human can only distinguish only around 40 greyscales, 256 are more than sufficient.

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What are examples of vector valued images?

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1) Colour images RGB -> 3 dimensions


2) Multispectral images 


Fun fact: humans can distinguish 2 million colours

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Whats quantisation?

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Discretisation of the co-domain (wertebereich) --> value discretisation

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What are main benefits of preprocessing?

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1.) Filtering: removal of noise and artifacts

2.) Simplification: makes it easier to interpret the content

3.) Scaling

4.) Rotating

..

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What is regarded as concentration in a diffusion process in computer vision?

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grey values

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Which classes of invariants do you know?

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geometric (e.g. translation, rotation, scaling)


photometric (e.g. shadowing, shading, reflections)

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Beispielhafte Karteikarten für deinen Computer Vision Kurs an der Universität Stuttgart - von Kommilitonen auf StudySmarter erstellt!

Q:

Advantages and drawbacks of PW?

A:

Advantage: 

  • no assumption about prior needed
  • works for non-parametric distributions (multi-modal..)

Disadvantages:

  • requires lots of data
  • difficult to determine expedient kernel size
Q:

Whats second-order statistics?

A:

incorporating the neighbourhood context 

Q:

List some major application of SIFT:

A:

1. estimation of global relations between images (stereo geometry, homographics..)


2.) tracking 


3.) structur from motion


4.) object detection and pattern recognition

Q:

What are the main benefits of Gaussian pyramids?

A:

1.) Solving problems in a coarse to fine manner accelerates most algorithms.


2.) Much more memory efficient as scale-spaces due to the downsampling step

Q:

Whats the kurtosis and skewness of a Gaussian?

A:

both 0

Mehr Karteikarten anzeigen
Q:

Are voxels usually cubic?

A:

No, the voxel dimensions usually differ in different directions. However, pixels are mostly squared.

Q:

Is 1 byte sufficent for the co-domain discretisation?

A:

Yes. As a human can only distinguish only around 40 greyscales, 256 are more than sufficient.

Q:

What are examples of vector valued images?

A:

1) Colour images RGB -> 3 dimensions


2) Multispectral images 


Fun fact: humans can distinguish 2 million colours

Q:

Whats quantisation?

A:

Discretisation of the co-domain (wertebereich) --> value discretisation

Q:

What are main benefits of preprocessing?

A:

1.) Filtering: removal of noise and artifacts

2.) Simplification: makes it easier to interpret the content

3.) Scaling

4.) Rotating

..

Q:

What is regarded as concentration in a diffusion process in computer vision?

A:

grey values

Q:

Which classes of invariants do you know?

A:

geometric (e.g. translation, rotation, scaling)


photometric (e.g. shadowing, shading, reflections)

Computer Vision

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