Computer Vision Overview
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Questions and Answers

What is the main objective of computer vision as described in the content?

  • To develop new visual art techniques
  • To replace human vision
  • To recover three-dimensional shape and appearance of objects in imagery (correct)
  • To create optical illusions

    • Computer vision has fully solved the challenge of explaining an image at the level of a two-year-old.

    False

    What are some of the methods used in computer vision to overcome the challenges of modeling the visual world?

    Physics-based models, probabilistic models, and machine learning.

    Researchers in computer vision can create accurate dense 3D surface models using __________ matching.

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

    Why is vision considered an 'inverse problem'?

    <p>We seek to recover unknowns with insufficient information.</p> Signup and view all the answers

    Match the following techniques with their descriptions:

    <p>Stereo matching = Creating dense 3D surface models Machine learning = Disambiguating potential solutions using examples Physics-based models = Modeling physical properties of light and objects Optical illusions = Demonstrating principles of human visual perception</p> Signup and view all the answers

    What is the significance of using a large set of views of a particular object in computer vision?

    <p>It allows for the creation of accurate dense 3D surface models.</p> Signup and view all the answers

    Progress in computer vision has been stagnant over the past two decades.

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

    What is the primary field that develops forward models used in computer vision?

    <p>Physics and Computer Graphics</p> Signup and view all the answers

    The Müller-Lyer illusion involves two lines that appear to be of different lengths due to perspective effects.

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

    What visual perception phenomenon explains why a white square in shadow appears different in brightness compared to a black square in light?

    <p>Brightness constancy</p> Signup and view all the answers

    The field of ___ focuses on how light reflects off surfaces and is scattered by the atmosphere in the context of computer vision.

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

    Match the following optical illusions with their descriptions:

    <p>Müller-Lyer illusion = Length perception influenced by perspective Brightness Constancy = Perception of brightness regardless of lighting Shadow Illusion = Same intensity perceived differently due to shadow Visual System = Processes and interprets visual information</p> Signup and view all the answers

    In what aspect of computer vision are physics models most commonly applied?

    <p>Object movement and animation</p> Signup and view all the answers

    Light only reflects off the surfaces of objects in an idealized manner, with no scattering effects.

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

    How do models in computer graphics contribute to computer vision?

    <p>They simulate object movement and light interactions.</p> Signup and view all the answers

    What is the purpose of exposure bracketing in photography?

    <p>To merge multiple exposures into a single image with optimal lighting</p> Signup and view all the answers

    Morphing involves transforming a photograph of an object into a 3D model.

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

    What technique is used to navigate through a collection of photographs in 3D?

    <p>Photo-based walkthroughs</p> Signup and view all the answers

    _______ is a technique that merges overlapping photos into a single panorama.

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

    Match the following computer vision applications with their descriptions:

    <p>Stitching = Creating a panoramic image Face detection = Improving camera focusing Video match move = Inserting images into videos Visual authentication = Logging in users via webcam</p> Signup and view all the answers

    Which technique allows for the removal of shake from videos?

    <p>Video match move and stabilization</p> Signup and view all the answers

    Visual authentication can automatically log users onto their home computer.

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

    What is one major reason for the focus on applications in computer vision?

    <p>To motivate and inspire students by providing relevant problems.</p> Signup and view all the answers

    What was a significant development in the 2000s regarding image-based rendering?

    <p>Development of computational photography</p> Signup and view all the answers

    High dynamic range (HDR) images do not require tone mapping algorithms to be displayed.

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

    What technique involves merging multiple exposures to create HDR images?

    <p>Exposure bracketing</p> Signup and view all the answers

    Image stitching and light-field capture are examples of __________ techniques.

    <p>image-based rendering</p> Signup and view all the answers

    Match the following techniques with their applications:

    <p>Tone mapping = Displayable results from HDR images Inpainting = Restoring parts of an image Texture synthesis = Creating new textures from existing samples Image stitching = Combining multiple images into one</p> Signup and view all the answers

    Which of these techniques is categorized under computational photography?

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

    Feature-based techniques combined with learning were mainly introduced in the 1990s.

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

    Name one notable paper regarding object recognition from the 2000s.

    <p>The constellation model or pictorial structures</p> Signup and view all the answers

    What does the JPEG standard use for still images?

    <p>An eight-bit range with no reserved values</p> Signup and view all the answers

    The HSV color space includes hue, saturation, and luminance.

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

    What does saturation represent in the HSV color space?

    <p>Scaled distance from the diagonal</p> Signup and view all the answers

    The RGB color values obtained from a JPEG image are called __________.

    <p>gamma-compressed</p> Signup and view all the answers

    Match the following components with their definitions in the HSV color space:

    <p>Hue = Direction around a color wheel Saturation = Scaled distance from the diagonal Value = Mean or maximum color value</p> Signup and view all the answers

    Which formula is not essential for general use in image processing?

    <p>Y0 matrix from the JPEG standard</p> Signup and view all the answers

    The Y xy coordinates are used to affect both saturation and hue in images.

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

    What is the primary use of deblocking in image processing?

    <p>To improve image quality</p> Signup and view all the answers

    Which of the following image compression standards uses 8 × 8 DCT transforms?

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

    The DC coefficients in video compression are directly derived from the AC coefficients.

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

    What is the main variable controlled by the quality setting on a JPEG file?

    <p>step size in quantization</p> Signup and view all the answers

    The alternative transformations used in JPEG 2000 are based on __________.

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

    Match the compression standards with their corresponding block sizes:

    <p>JPEG = 8 × 8 MPEG = 16 × 16 JPEG 2000 = Variable size AV1 = 4 × 4 or 2 × 2</p> Signup and view all the answers

    Which compression standard is noted for using smaller block sizes like 4 × 4 or 2 × 2?

    <p>AV1</p> Signup and view all the answers

    Block-based motion compensation encodes the difference between each block and predicted pixel values from the current frame.

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

    What type of coding scheme can be used to encode the coefficient values after transform coding?

    <p>Huffman code or arithmetic code</p> Signup and view all the answers

    Study Notes

    Computer Vision Module 1

    • Computer vision is about recreating the three-dimensional structure of the world from images.
    • Humans perceive 3D easily, but computers find it difficult.
    • Computer vision techniques use mathematical models and machine learning to infer properties from images (e.g., shape and appearance.)
    • Using large sets of partially overlapping photographs, 3D models can be created.
    • These advances are used in applications like optical character recognition, mechanical inspection, retail, warehousing logistics, and medical imaging.
    • Self-driving cars and drone-based photogrammetry are also enabled by computer vision.
    • Computer vision is an inverse problem; finding the solution is difficult.

    Optical Illusions and Visual Perception

    • Illusions are used to test visual principles such as brightness constancy.
    • The visual system attempts to compensate for changes in lighting.
    • Visual perception is complex.
    • There is no easy solution to understanding the principles of visual perception.

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    Related Documents

    Computer Vision: Algorithms and Applications PDF

    Description

    This quiz explores the fundamental concepts and challenges in computer vision. From understanding visual perception phenomena to the methods used for modeling the visual world, test your knowledge on the key principles that define this field. Delve into topics like inverse problems and the significance of various approaches.

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