Elements of Visual Perception-Digital Image Processing-Lecture 02 Slides Slides-Electrical and Computer Engineering, Slides for Digital Image Processing. University of Alabama (AL)

Digital Image Processing

Description: Elements of Visual Perception, Visual Perception, Cross Section, Human Eye, Retinal Surface, Rods, Cones, Distribution, Receptors, Imaging, Sampling, Quantization, Spatial, Resolution, Reducing, Gray Levels, Pixels, Connectivity, Adjacencies, Paths, Connected Components, Labeling, Digital Image Processing, Lecture Slides, Dr D J Jackson, Department of Electrical and Computer Engineering, University of Alabama, United States of America.
Showing pages  1  -  2  of  13
Dr. D. J. Jackson Lecture 2-1Electrical & Computer Engineering
Computer Vision &
Digital Image Processing
Dr. David Jeff Jackson
Electrical & Computer Engineering
The University of Alabama
Dr. D. J. Jackson Lecture 2-2Electrical & Computer Engineering
Elements of visual perception
Goal: help an observer interpret the content of an
Developing a basic understanding of the visual
process is important
Brief coverage of human visual perception follows
Emphasis on concepts that relate to subsequent material
Dr. D. J. Jackson Lecture 2-3Electrical & Computer Engineering
Cross section of the human eye
Eye characteristics
nearly spherical
approximately 20 mm in
three membranes
cornea (transparent) & sclera
(opaque) outer cover
choroid contains a network of
blood vessels, heavily
pigmented to reduce amount of
extraneous light entering the
eye. Also contains the iris
diaphragm (2-8 mm to allow
variable amount of light into the
retina is the inner most
membrane, objects are imaged
on the surface
Dr. D. J. Jackson Lecture 2-4Electrical & Computer Engineering
Retinal surface
Retinal surface is covered in discrete light receptors
Two classes
6-7 million located primarily near the center of the retina (the fovea)
highly sensitive to color
can resolve fine details because each is attached to a single nerve
Cone vision is called photopic or bright-light vision
75-150 million distributed over the retinal surface
multiple rods connected to a single nerve ending
give a general overall picture of the field of illumination
not color sensitive but are sensitive to low levels of illumination
Rod vision is called scotopic or dim-light vision
The preview of this document ends here! Please or to read the full document or to download it.
Document information
Embed this document:
Docsity is not optimized for the browser you're using. In order to have a better experience please switch to Google Chrome, Firefox, Internet Explorer 9+ or Safari! Download Google Chrome