Perspective Projection and Non-linear Equations Quiz
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Questions and Answers

What is the rank of the centered measurement matrix formed from N points tracked over F frames?

  • 5
  • 2
  • 3 (correct)
  • 4
  • In the factorization algorithm, what does the matrix D' represent?

  • A diagonal matrix of the largest eigenvalues (correct)
  • A matrix of corresponding column vectors from U
  • A 3x3 matrix of unit vectors orthogonal
  • A matrix of corresponding row vectors from VT
  • What is the purpose of solving for Q in the factorization approach?

  • To make appropriate rows of M satisfy unit vectors orthogonal (correct)
  • To compute the weak perspective approximation
  • To find the determinant of the centered measurement matrix
  • To determine the orthographic camera parameters
  • What is the result of defining M as U' D'^1/2 in the factorization algorithm?

    <p>M = U' D'^1/2</p> Signup and view all the answers

    What is the dimension of the matrix U in the SVD of W in the factorization algorithm?

    <p>2Fx2F</p> Signup and view all the answers

    Why is linearizing and iterating necessary when solving the nonlinear equations in factorization problems?

    <p>To converge to a solution faster</p> Signup and view all the answers

    In the context of perspective projection, what effect does a weak perspective approximation have on the appearance of objects?

    <p>Objects maintain their true size regardless of distance.</p> Signup and view all the answers

    What is the main difference between orthographic projection and perspective projection?

    <p>Perspective projection simulates how objects appear smaller with distance.</p> Signup and view all the answers

    When using homogeneous coordinates, what allows for the representation of translations in a 3D space?

    <p>The third column of the transformation matrix.</p> Signup and view all the answers

    How are multiple points represented and manipulated in the frames notation approach?

    <p>Points are represented by multiple subscripts, each corresponding to a different frame.</p> Signup and view all the answers

    Which approach involves recovering the positions of multiple points by factoring out the common transformation between them and their respective reference frames?

    <p>Factorization Approach</p> Signup and view all the answers

    What is the purpose of setting the origin of the world coordinate system at the center of pass of multiple points in factorization approach?

    <p>To ensure unique recovery of absolute positions of points.</p> Signup and view all the answers

    What is the maximum rank of a 6x4 matrix?

    <p>4</p> Signup and view all the answers

    If matrix A has rank 2 and matrix B has rank 3, what is the maximum possible rank of the product A*B?

    <p>2</p> Signup and view all the answers

    If a 3x4 matrix maps points from 3D to 2D space, what is the intrinsic dimension of the mapped 2D space?

    <p>3</p> Signup and view all the answers

    If the measurement matrix $W_{2F\times N}$ has rank 3, how many non-zero eigenvalues will it have?

    <p>3</p> Signup and view all the answers

    In the factorization $W_{2F\times N} = U_{2F\times N} D_{N\times N} V^T$, if the rank of $W$ is 3, how many columns of $V$ correspond to non-zero singular values?

    <p>3</p> Signup and view all the answers

    If a camera matrix $P$ has rank 3, what type of projection does it represent?

    <p>Weak perspective projection</p> Signup and view all the answers

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