Image Matching Methods Quiz

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Questions and Answers

How is sparse image matching different from dense image matching?

  • Sparse image matching produces a 3D point cloud, while dense image matching computes epipolar lines.
  • Sparse image matching produces matches for every pixel, while dense image matching produces matches for specific points.
  • Sparse image matching operates on B&W images, while dense image matching uses color images.
  • Sparse image matching computes high-quality matches for specific points, while dense image matching computes lower-quality matches for every pixel. (correct)

In the context of image matching, what method involves operating on black and white images to detect interest points?

  • Least-squares matching
  • Epipolar resampling
  • Harris operator (correct)
  • Cross-correlation

What is the purpose of traditional relative orientation in the context of image processing?

  • To pre-calibrate cameras for image capturing.
  • To produce a dense 3D point cloud.
  • To compute high-quality matches for each pixel.
  • To determine the RO parameters for computing epipolar lines. (correct)

What technique is used to identify incorrect matches during feature point matching?

<p>Harris operator (A)</p> Signup and view all the answers

Which method is employed to produce a set of high-quality matches for stereo pairs in image processing?

<p>Sparse image matching (A)</p> Signup and view all the answers

What role does autonomous relative orientation play in feature point matching?

<p>Determining interest points in images. (B)</p> Signup and view all the answers

What is an interest point in the context of autonomous relative orientation?

<p>A point distinct from its surroundings (B)</p> Signup and view all the answers

How is the search space reduced in autonomous relative orientation using the epipolar line constraint?

<p>By turning it into a 2D search (B)</p> Signup and view all the answers

What does the elevation range constraint achieve in reducing the search space in relative orientation?

<p>Approximates the feature height (B)</p> Signup and view all the answers

How does the use of an image pyramid reduce the search space in relative orientation?

<p>By reducing image resolution in a pyramid structure (A)</p> Signup and view all the answers

In relative orientation, what is the purpose of area-based matching?

<p>To determine feature matching based on brightness values (C)</p> Signup and view all the answers

How does traditional relative orientation differ from autonomous relative orientation?

<p>Traditional RO requires manual intervention while autonomous RO is automated (D)</p> Signup and view all the answers

What is the main reason it is not possible to solve for all 12 parameters in a stereo pair?

<p>Limited geometric degrees of freedom (C)</p> Signup and view all the answers

In the context of dependent relative orientation, what condition must be satisfied for all vectors to be in the same coordinate system?

<p>Orthogonality (C)</p> Signup and view all the answers

What is a benefit of having a 60% overlap in feature matching for autonomous relative orientation?

<p>Improved matching accuracy (B)</p> Signup and view all the answers

Which parameter is typically held constant in traditional relative orientation when selecting and measuring points?

<p>Camera focal length (B)</p> Signup and view all the answers

What distinguishes autonomous relative orientation from traditional relative orientation in terms of point selection?

<p>Automatic feature extraction (A)</p> Signup and view all the answers

In feature matching, what does high redundancy among points imply?

<p>Greater robustness to outliers (B)</p> Signup and view all the answers

What impact does a low feature matching accuracy have on autonomous relative orientation?

<p>Reduced effectiveness of triangulation (A)</p> Signup and view all the answers

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