Luminance Perception Quiz

What is the anchoring rule in the context of luminance perception?

• The rule that the highest luminance is taken as the reference level.

• The rule that the lowest luminance is taken as the reference level.

• The rule that the average luminance is taken as the reference level.

• The rule that the median luminance is taken as the reference level.

What does the white balance setting in cameras do?

• It adjusts the color saturation.

• It finds the highest luminance and makes it white.

• It increases the contrast of the image.

• It reduces the noise in the image.

What is the main challenge in applying the highest luminance rule according to Alan Gilchrist?

• Identifying the highest luminance in a scene.

• Segmenting the scene into regions of different illumination.

• Adjusting the white balance in cameras.

• Increasing the sharpness of the image.

What does the visual system use to identify different illumination regions effectively?

• Color saturation.

• Sharpness of edges.

• Contrast levels.

• Noise reduction.

What is the scaling problem in the context of perception of luminance?

• The difficulty in perceiving differences in color.

• The challenge in grouping regions based on spatial proximity.

• The issue of whether we perceive differences in physical intensity.

• The problem of identifying illumination edges in a scene.

What is the term used to describe the grouping of regions based on similarity in intensity, lightness, or luminance?

• Anchoring theory

• Spatial proximity

• Compression

• Expansion

What does the term "compression" refer to in the context of perceived intensity?

• Perceiving the physical ratios of intensity that exist in the external scene.

• Perceiving the lighter surface as five times brighter than the darker surface.

• Perceiving the physical difference as 5 to 1 but perceiving it as less.

• Perceiving the physical difference as 5 to 1 but perceiving it as more.

What does the term "expansion" refer to in the context of perceived intensity?

• Perceiving the physical difference as 5 to 1 but perceiving it as less.

• Perceiving the physical difference as 5 to 1 but perceiving it as more.

• Perceiving the physical ratios of intensity that exist in the external scene.

• Perceiving the lighter surface as five times brighter than the darker surface.

What does the visual system use to perceive physical differences in intensity?

• Only vertical mapping

• Only compression

• Only expansion

• All three: vertical mapping, compression, and expansion

What does the visual system tend to do with the perceived range of intensities in a scene?

• Compress the range of intensities

• Expand the range of intensities

• Ignore the range of intensities

• Invert the range of intensities