In computer graphics, Lambertian reflection is often used as a model for diffuse reflection, and is calculated by taking the dot product of the surface's normalized normal vector and a normalized vector pointing from the surface to the light source. This number is then multiplied by the color of the surface and the intensity of the light hitting the surface:
where is the intensity of the diffusely reflected light (surface brightness), is the color and is the intensity of the incoming light. Because
where is the angle between the direction of the two vectors, the intensity will be the highest if the normal vector points in the same direction as the light vector (, the surface will be perpendicular to the direction of the light), and the lowest if the normal vector is perpendicular to the light vector (, the surface runs parallel with the direction of the light).
Lambertian reflection is typically accompanied by specular reflection, where the surface luminance is highest when the observer's angle is the same as the angle of the light source. This is simulated in computer graphics with Phong shading.
Spectralon is a material which is designed to exhibit an almost perfect Lambertian reflectance, while Scotchlite is a material designed with the opposite intent of only reflecting light on one line of sight.
While lambertian reflectance usually refers to the reflection of light by an object, it can be used to refer to the reflection of any wave. For example, in ultrasound imaging, "rough" tissues are said to exhibit lambertian reflectance.
WIPO ASSIGNS PATENT TO ZOLO TECHNOLOGIES FOR "MITIGATION OF OPTICAL SIGNAL NOISE USING A MULTIMODE TRANSMIT FIBER" (AMERICAN INVENTORS)
Feb 19, 2011; GENEVA, Feb. 19 -- Publication No. WO/2011/019755 was published on Feb. 17. Title of the invention: "MITIGATION OF OPTICAL SIGNAL...