What is a reflectance edge?

What is a reflectance edge?

Reflectance edge. an edge where the reflectance of the 2 surfaces changes. Illumination edge.

What is the difference between and illumination edge and a reflectance edge?

If two intersecting edges show luminance ratio invariance, one edge is likely to be an illumination edge or non-reflective transparency, the other a reflectance edge. If the contrast sign changes across two intersecting edges, the edges are both likely to be reflectance edges.

What is perceptual lightness?

Richard F. Murray; A model of lightness perception guided by probabilistic assumptions about lighting and reflectance. Lightness perception is the ability to perceive black, white, and gray surface colors in a wide range of lighting conditions and contexts.

What is reflectance in image processing?

Reflectance is the amount of light reflected by the object in the scene. It is represented by r(x, y).

What is the unit of reflectance?

Reflectance is the ratio of the amount of light leaving a target to the amount of light striking the target. It has no units.

How do you calculate reflectivity?

Reflectivity can be calculated as p(y) = Gr(y)/Gi(y) where p is the reflectivity, y is the wavelength of the light, Gr is the reflected radiation and Gi is the incident radiation. Calculate reflectance from the reflectivity. Reflectance is the square of the reflectivity so q(y) = (Gr(y)/Gi(y))^2.

How do you calculate lightness?

Here are 3 ways to calculate Luminance:

1. Luminance (standard for certain colour spaces): (0.2126*R + 0.7152*G + 0.0722*B) source.
2. Luminance (perceived option 1): (0.299*R + 0.587*G + 0.114*B) source.

What is reflectance formula?

Calculate reflectance from the reflectivity. Reflectance is the square of the reflectivity so q(y) = (Gr(y)/Gi(y))^2. where q is the reflectance, y is the wavelength of the light, Gr is the reflected radiation and Gi is the incident radiation.

How do you calculate reflectance value?

This contrast is calculated using the following formula: (B1 – B2) x 100 / B1, where B1 and B2 are the LRV of the lighter area and darker area, respectively. The LRV can be obtained using the CIE Y values measured under the illuminant D65 (natural daylight) and 10° observer.