6 Answered Questions for the topic projection

Projection Linear Algebra

05/12/20

How to construct a matrix to project 4-dimensional space to a 2-dimensional plane?

How to Construct a matrix to project vectors in 4-dimensional space to a 2-dimensional plane that lies in the space and passes through the origin and the points (1,-1, -1, 1) and (1, -1, 1, 1).
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05/12/20

How to construct a matrixto project 4-dimensional space to a 2-dimensional plane?
How to Construct a matrix to project vectors in 4-dimensional space to a 2-dimensional plane that lies in the space and passes through the origin and the points (1 ,-1, -1, 1) and (1, -1, 1, 1).
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Projection Geometry Maths Circle

05/17/19

I need to work out the elipse a half circle that is vertical leaves on to a pitched surface

Say the half circle had a radius of 800mm and it was casting back of to a pitched line of 45 degrees it would leave an elipse how do i work that out ? And is therr a set formula so i can change... more
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04/20/19

Determining camera parameters?
Given a picture taken by a simple digital that contains an image of a rectangle of known dimensions. How can I - to some degree of accuracy - determine the parameters of this camera? I am mostly... more
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04/12/19

Is there a map that displays every country at its correct relative size?
I know that the standard Mercator projection is completely wrong when it comes to the relative sizes of countries (Greenland appears relatively much larger than in reality, for example). AFAIK they... more
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04/03/19

Lens correction projection?
What is the simplest way to un-warp a photo made using fisheye or wide-angle lens? I'm looking a pixel projection formula that has few parameters. Camera and lens parameters will not be known, so... more
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