PSYC1002 Lecture Notes - Lecture 16: Isomerization, Aerial Perspective, Retinal Ganglion Cell
19 May 2018
School
Department
Course
Professor
Three stages
Image formation
1.
Electromagnetic wave (typical up and down)
-
If dimensions of obstacles or aperture are much larger than the wavelength of the light, then
light can be treated as rays that move in straight lines
-
Screen clipping taken: 16/11/2017 11:34 AM
Light
Different wavelengths of light bent different amounts, so they have different focal planes ie.
Can't use refraction to focus all the wavelengths of light
-
Visual system picks particular wavelength to be in focus, and rest are blurred by varying
amounts
-
Screen clipping taken: 16/11/2017 11:54 AM
Sparseness of blue cones, as eye usually receives too much blue so fewer cones
-
Diffuse
○
Specular
○
Surface reflectance
L5, 6, 7 - vision
Thursday, 16 November 2017
11:32 AM
perception Page 1
Screen clipping taken: 16/11/2017 11:35 AM
Compound - fly, made of repeating ommatidio units which functions as a separate visual
receptor, generates mosaic image pattern of light and dark dots
-
Screen clipping taken: 16/11/2017 11:38 AM
Convex mirrors - scallop, satellite dishes
-
Screen clipping taken: 16/11/2017 11:38 AM
Pinhole - sea creature
-
Convex lens
○
Diverging light from all different directions converge to a single point
○
Single chambered - human
-
Types of eyes
perception Page 2
Screen clipping taken: 16/11/2017 11:40 AM
One region/point of the world mapping onto one receptor e.g. pinhole camera
-
If hole is too big -> generates blur
-
Screen clipping taken: 16/11/2017 11:37 AM
Many different parts of the scene, project to the same point and are summed
-
Image formation
Has increased due to people only looking at short distances due to technology
○
Myopia (short-sighted) - eye is too long, focal length is too short doesn't hit retina
-
Hyperopia (long-sighted) - eye is too short, focal length is too long for eye
-
Screen clipping taken: 16/11/2017 11:42 AM
Myopia and hyperopia
Cornea performs most of initial focusing of image
-
Lens changes shape to adjust focus on objects at different distances
-
Accommodation
perception Page 3
Document Summary
If dimensions of obstacles or aperture are much larger than the wavelength of the light, then light can be treated as rays that move in straight lines. Different wavelengths of light bent different amounts, so they have different focal planes ie. can"t use refraction to focus all the wavelengths of light. Visual system picks particular wavelength to be in focus, and rest are blurred by varying amounts. Sparseness of blue cones, as eye usually receives too much blue so fewer cones. Compound - fly, made of repeating ommatidio units which functions as a separate visual receptor, generates mosaic image pattern of light and dark dots. Diverging light from all different directions converge to a single point perception page 2. One region/point of the world mapping onto one receptor e. g. pinhole camera. If hole is too big -> generates blur. Many different parts of the scene, project to the same point and are summed.
