EE409 – Digital Image Processing 2017-2018 Spring
3. Fundamentals of Digital Image Processing
by: Dr. Gökhan Koray GÜLTEKİN (adapted from Dr.S.Gedik’s slides)
Light and the Electromagnetic Spectrum
Three basic quantities
Radiance: Total amount of energy that flows from light source (W)
Luminance: Amount of energy an observer perceives from light source (lumens – lm)
E.g.: Consider a high radiance IR source with significant energy
Zero luminance if an observer does not perceive
Brightness: perception
Subjective
descriptor
of
light
1