Image processing apparatus and method of same
AssigneeSony Corporation
InventorHiroyuki Shioya
Life of this patent
Estimating the term…
Abstract
An image processing apparatus for finding reflectivity based on a BRDF model expressing a ratio of reflection of light incident upon one point of a surface of an object to be drawn at the object surface, the image processing apparatus having an operation unit for calculating the reflectivity based on a BRDF model calculated by a quadratic-form matrix expression including a vector comprised of a light source direction vector, a viewpoint direction vector, and a normal direction vector and a matrix determining the characteristics of the BRDF model, thereby able to achieve both a variety of expression power and good operation efficiency when mounted in a programmable pixel shader and further having enough of a compactness to easily cope with a shift-variant BRDF, and a method of the same.
Claims26
An image processing apparatus for finding reflectivity based on a bi-directional reflection distribution function (BRDF) model expressing a ratio of reflection of light incident upon one point of a surface of an object to be drawn at the object surface, comprising:
- a first operation means for outputting a direction of a light source and a direction of a viewpoint;
- and
- a second operation means for calculating said reflectivity based on a BRDF model calculated by a quadratic-form matrix expression having the form of
- t
-
- [
- L
- V
- N
- ]
-
- [
- M
- ]
-
- [
- L
- V
- N
- ]
- wherein L is a vector corresponding to a light source direction vector representing the direction of the light source, V corresponds to a viewpoint direction vector representing the direction of the viewpoint, N corresponds to a normal direction vector, and M is a matrix corresponding to a parameter for determining the characteristics of the BRDF model.
An image processing method for finding reflectivity based on a bi-directional reflection distribution function (BRDF) model expressing a ratio of reflection of light incident upon one point of a surface of a generated object at the object surface, comprising:
- calculating said reflectivity based on a BRDF model calculated by a quadratic-form matrix expression having the form of
- t
-
- [
- L
- V
- N
- ]
-
- [
- M
- ]
-
- [
- L
- V
- N
- ]
- wherein L is a vector corresponding to a light source direction vector representing the direction of the light source, V corresponds to a viewpoint direction vector representing the direction of the viewpoint, N corresponds to a normal direction vector, and M is a matrix corresponding to a parameter for determining the characteristics of the BRDF model.
Dependencies are inferred from the claim text.