vision and colour Flashcards
(27 cards)
how do we see colour
cones get hit by light at a certain wavelength and the retina does minus calculations to convert that into a biological signal
what does fovea vision allow
allows perception of detail
high resolution and colour sensitivity
what is the degree for fovea vision
1-2
what is the degree for peripheral vision
200 degrees left and right
130 degrees up and down
how do peripheral and fovea vision operate together
in parallel
peripheral vision
detection of stimuli; motion and light changes
fixations
we move our eyes to align with objects of interest to get details
how much time do we need for fixations
200ms before moving to the next fixation
saccades
the fast movement between each fixation
how much time do we need for saccades
20-30ms
what is our viewing range without head movements
30 degrees down and 20 degrees left and right
why do we need head movements when moving our eyes
helps us keep the eyes in a comfortable viewing range
cyclopean model
whilst we have two eyes we never see two different images as theyre fused into one
binocular model
our eyes are like two cameras at an offset from eachother
what is binocular vision and what is it caused by
images from both eyes are slightly different
parallax
binocular disparity
the difference between both eyes gives a hint to the depth of an object
vestibular
senses how much you rotate your head
what causes simulator sickness
when theres a conflict between physical and visually percieved motion
what gives us a sense of motion
when we move our heads a flow of light is created in the retina
vergence
the eyes turning towards eachother in the head so the lines of sight are aligned
accommodation
eye lens changes shape to focus on an object with respect to the optics of the system
what is the colour of an object
the wavelength of light that it doesnt absorb
colour models
help us describe colours
what are the 3 main colour models
rgb
cmyk
hsv
