CV Chapter 1 Introduction
Questions about the lecture 'Computer Vision' of the RWTH Aachen Chapter 1 Introduction
Questions about the lecture 'Computer Vision' of the RWTH Aachen Chapter 1 Introduction
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Cartes-fiches
What are the different fields of computer vision? [6]
1. AI, 2. machine learning, 3. cognitive science, 4. algorithms, 5. image processing and 6. graphics
What is the motivation of computer vision? [2]
1. Cameras (images and videos) are everywhere
2. Understand images and videos
What are the components of understanding images and videos? [3]
1. Measurement
2. Perception and interpretation // Recognize objects, people, scenes
3. Structure
What are the applications of computer vision? [9]
1. face detection to set focus, lighting, smile
2. background removal
3. panoramas
4. visual search // Google googles
5. vision based interface
6. medical imaging
7. visual special effects
8. safety and security for car, monitoring, surveillance
9. depth from defocus
What are the challenges of computer vision? [4]
1. Foundations of perception // How do we see?
2. Engineering the system
3. Nuisance parameter
4. Complexity
Which nuisance parameter exist? [6]
1. Illumination
2. Object pose
3. Clutter
4. Occlusions
5. Intra-class appearance
6. Viewpoint
What are the components of complexity? [6]
1. Number of pixels
2. Number of human recognizable object categories
3. Degrees of freedom in the pose of articulated objects
4. Images by Google Image Search
5. Prints by digital cameras
6. Number of camera phones
What happened 1519?
DaVinci with defining camera obscura // Display of images
What happened in the 17th century?
Vermeer with using camera obscura
What happened 1898?
Jetty at Margate, England with camera obscura as attraction
What happened 1966?
Papert directs student to solve “the problem of computer vision” as a summer project
What happened 1991?
Felleman and VanEssen with half of the cerebral cortex devoted for processing visual information
What are the characteristics of pinhole camera? [3]
1. Box with small hole projecting virtual image on image plane
2. Too big/small hole → blur
3. Dark due to small set of rays
What are the characteristics of lenses? [2]
1. Keep the image in sharp focus while getting more information
2. Thin // 1/z’ - 1/z = 1/f
What are the characteristics of depth of field (DoF)? [2]
1. Distance between image planes where blur is tolerable
2. Big/small aperture creates small/big DoF
What are the characteristics of focal length (FL)? [1]
Small/big FL creates wide angle/telescopic images
What are the characteristics of the sensor array of digital images? [3]
1. Charge coupled devices (CCD) are used
2. Light intensities → pixel value
3. Bayer grid with filter layer and sensor array
What are the characteristics of the resolution of digital images? [3]
1. affects analysis and representation choice
2. sensor // real world scene element to pixel size
3. image // number of pixels
Test
Test2
