Lab Report

In your lab write-up, include an introduction and conclusion, keeping in mind the following general points:

Also include answers to the following questions.

Images A1 and A2: Horizontal and Vertical Mach Bands

Mach bands can be used to demonstrate the eye's impulse response. The intensity discontinuities that exist at the boundaries between bands cause overshoots and undershoots in perceived brightness.

  1. Discuss in detail the reason behind this phenomenon and what it tells you about the response of the eye.

Image B: Sinusoidal Grating

The sinusoidal grating is useful for analyzing the frequency response of the eye.

  1. In what frequency range is the contrast the strongest? Howw does the amplitude affect the location/size of this range? What does this tell you about your eye's Modulation Transfer Function?

  2. How does your perception of the grating change as you vary you distance from the computer monitor?

Image C: Simultaneous Contrast

  1. Describe what you see for different values of S2 and explain why you see it.

Image D: Weber's Law

  1. Are your results consistent with Weber's law?


  1. List three important applications that require a model of the spatial frequency response of the eye, and discuss why a model is required.