YSBAT      Contrast Enhancement      02-13-07

- Define contrast stretching and explain the 2 problems that it resolves

- Explain "auto-scaling" using a frequency histogram to explain your answer

- Clarify the problem that "auto-scaling" solves and the problem that it does not solve and why

- Explain why a linear stretch with new minimum and maximum bounds solves both problems

- Perform a "linear stretch with new minimum and maximum bounds" by hand

- Explain "linear stretch with saturation" using a frequency histogram to explain your answer

- Define and explain what causes "over-saturation"

- Explain a "standard deviation stretch" using a frequency histogram to explain your answer

- Explain a histogram equalization stretch, using a frequency histogram to explain your answer

- Explain a Gaussian stretch, using a frequency histogram to explain your answer

- Draw "look-up tables" (LUT-graphs) that describe autoscaling, "linear stretch with new minimum and maximum bounds" (or other linear stretches) and a Guassian non-linear stretch.