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Unformatted text preview: # 10 ECE 253a Digital Image Processing Pamela Cosman 10/29/10 QUIZ 1 SOLUTIONS 1. Human Visual System: (a) The relative luminous efficiency function shows, for each wavelength in the visible spec- trum, how efficient the human visual system (HVS) is at converting energy at that wavelength into a visible sensation of light, relative to how efficient the HVS is at the reference wavelength of 555nm. (b) Mach bands show a staircase function of increasing luminance, but the perceptual effect is not of a simple staircase. Rather, there are overshoots and undershoots at each step edge, which have the effect of enhancing the edge. (c) The oblique effect refers to the fact that humans have better acuity and sensitivity when stimuli are presented in vertical and horizontal directions, rather than presented at some oblique angle. (d) The contrast sensitivity function shows how sensitive humans are to sinusoidal grating patterns with different spatial frequencies. People are most sensitive at around 4 cpd, meaning that is where people need the least contrast to be able to detect that the stimulus...
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This note was uploaded on 01/15/2012 for the course ECE ece253A taught by Professor Cosman during the Fall '11 term at UCSD.
- Fall '11
- Image processing