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15 Cards in this Set
- Front
- Back
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Luminance |
Light coming off a surface Candelas/m^2 |
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Illuminance |
Light landing on a surface Lumens/m^2 |
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3 types of stimuli |
Intensity = luminance contrast, colour Temporal = frequency, duration Spatial= frequency size/area, distance, location/direction, depth |
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Depth |
Separation between 2 stimuli located at different distances from the observer |
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Luminous power |
Total power produced in all directions Lumens |
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Two types of responces |
Task = detection, discrimination, recognition, identification,magnitude estimation |
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Detection |
Judgement of presence |
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Discrimination |
Telling the difference between two stimuli ie which is brighter |
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Recognition |
Response to a stimuli |
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Magnitude estimation |
Method of scaling. Ppl asked to judge magnitude at a subjective experience |
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Visual angle equation |
Tan=h/d D=h/tan H=d*tan |
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What is contrast |
Measure of luminance difference |
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Webers contrast |
Cw = (Ls-Lb)/Lb |
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Michaelsons contrast |
Cm = lmax-lmin/lmax+lmin |
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Abneys law |
Lp= Lwl Luminous power at each wavelength |
