Lecture 7/8 2D transformation and projection Flashcards by Sankha Gamage | Brainscape

Q

What transformations can be represented by p_prime
= M x p

A

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Q

Visualise a 2D transform to scale an image

A

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Q

Visualise a 2D transform to stretch an image

A

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Q

Visualise a 2D transform to Flip an image horizontally

A

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Q

Visualise a 2D transform to Shear / Skew an image

A

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Q

Visualise a 2D transform to rotate an image ANTI-CLOCKWISE

A

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Q

Visualise a 2D transform to rotate an image CLOCKWISE

A

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Q

A

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Q

How do you go from a set of homogeneous points to a set of un-homogeneous points?

A

Divide by 3rd point

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Q

Visualise a 2D transform to translate an image

A

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Q

Visualise a rotation followed translation by matrix

A

p0 = ( T R ) p

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Q

Visualise a translation followed by rotation matrix ANTI-CLOCKWISE

A

p0 = ( R T ) p

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Q

What are the steps to rotate about an arbitrary point

A

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Q

How do I perform compound transformations using row vectors?

A

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Q

How many points are needed to align images with an affine transform?

A

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Q

How many points are needed to align images with a homography transform?

A

Q

How do we warp images given a known linear transform?

A

Q

Describe Bilinear interpolation

A

Q

Describe Nearest-neighbour
interpolation

A

Take a point from an image
[x, y] = [132.45, 80.26]

Round the x-coordinate
[132.45, 80.26] à [132, 80.26]

Round the y-coordinate
[132, 80.26] à [132, 80]

Considers only the nearest pixel

Q

What equations are used for bi-linear interpolation?

A