Computer Vision: Spectral Composition of Illumination

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Questions and Answers

What is the result of holding the box with a pinhole in front of a light source in a dimly lit room?

  • An inverted image of the candle appears on the translucent plate (correct)
  • No image of the candle appears on the translucent plate
  • An upright image of the candle appears on the translucent plate
  • A magnified image of the candle appears on the translucent plate

What is the principle of the pinhole camera model?

  • Exactly one light ray originating from a point in the scene falls onto a corresponding point in the image plane (correct)
  • Multiple light rays originating from a point in the scene fall onto a corresponding point in the image plane
  • No light rays originating from a point in the scene fall onto the image plane
  • All light rays originating from a point in the scene fall onto a random point in the image plane

What is a characteristic of the perspective projection model defined by the pinhole camera?

  • The apparent size of objects is always magnified
  • The apparent size of objects is independent of their distance to the camera
  • The apparent size of objects is dependent on their distance to the camera (correct)
  • The apparent size of objects is always shrunk

What is the advantage of considering the virtual image on the plane in front of the pinhole?

<p>It makes the image easier to analyze (D)</p> Signup and view all the answers

What is the significance of the pinhole camera model in computer vision?

<p>It is an idealized and simplified optical imaging system (A)</p> Signup and view all the answers

When was the camera obscura invented?

<p>16th century (B)</p> Signup and view all the answers

What is the relation between the coordinates of scene and image points in the pinhole projection model?

<p>x = y = f / z (B)</p> Signup and view all the answers

What is the main disadvantage of the pinhole principle?

<p>Not enough light is gathered from the scene (B)</p> Signup and view all the answers

What is the purpose of using a lens in camera technology?

<p>To increase the amount of light gathered from the scene and keep the image in focus (D)</p> Signup and view all the answers

What is the assumption made in the weak perspective projection model?

<p>The scene depth is small with respect to the scene distance (B)</p> Signup and view all the answers

What is the effect of increasing the size of the pinhole?

<p>The image becomes more blurred (C)</p> Signup and view all the answers

What is the main factor that defines the behavior of lenses?

<p>Geometric optics (D)</p> Signup and view all the answers

What is the main factor that affects the spectral composition of illumination?

<p>The type of illumination sources and absorption by object surfaces (A)</p> Signup and view all the answers

What is the result of the varying spectral composition of visible light in the human visual system?

<p>The sensation of color (D)</p> Signup and view all the answers

What is the purpose of the experiment described in the text?

<p>To demonstrate the concept of image formation (A)</p> Signup and view all the answers

What is the role of the pinhole in the experiment?

<p>To allow light to enter the box (B)</p> Signup and view all the answers

What is the outcome of the experiment?

<p>An inverted image of the light source is seen on the plate (B)</p> Signup and view all the answers

What is the primary function of an imaging system?

<p>To project an image of a 3-dimensional scene or object onto a 2-dimensional image plane (B)</p> Signup and view all the answers

What is the result of spherical aberration in real lenses?

<p>Light rays from P form a circle of confusion in the image plane. (D)</p> Signup and view all the answers

What causes chromatic aberration in real lenses?

<p>The index of refraction being dependent on the wavelength. (A)</p> Signup and view all the answers

What type of distortion is shown in figure (c)?

<p>Fish-eye distortion. (A)</p> Signup and view all the answers

What is the purpose of using multi-lens arrangements in real optical systems?

<p>To minimize aberrations. (C)</p> Signup and view all the answers

What is the result of vignetting effects in multi-lens systems?

<p>Light rays are blocked by the appertures of different lenses. (B)</p> Signup and view all the answers

Who is the author of the book 'Computer Vision: Algorithms and Applications'?

<p>Richard Szeliski (B)</p> Signup and view all the answers

What is the z-coordinate of the image point P' in the image plane?

<p>f0 (D)</p> Signup and view all the answers

What is the relationship between the coordinates of the scene point P and its image point P'?

<p>x' = fx/z, y' = fy/z, z' = f (D)</p> Signup and view all the answers

What is the condition for the points P, O, and P' to be colinear?

<p>OP = λP'O (A)</p> Signup and view all the answers

What is the value of λ in terms of the coordinates of P and P'?

<p>λ = f/z (C)</p> Signup and view all the answers

What is the equation relating the x-coordinate of P and P'?

<p>x' = fx/z (B)</p> Signup and view all the answers

What is the name of the projection model described in the text?

<p>Pinhole projection (D)</p> Signup and view all the answers

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