초록 ▼

A physical camera is modeled to render an image in a computer graphics system. When given the manufacturer's specifications of the physical camera's lenses, including the dimensions and indices of refraction of its lenses, stops, and shutter characteristics, the location of the film surface relative

A physical camera is modeled to render an image in a computer graphics system. When given the manufacturer's specifications of the physical camera's lenses, including the dimensions and indices of refraction of its lenses, stops, and shutter characteristics, the location of the film surface relative to the lens system, and the orientation of the camera within the scene, the invention accurately and efficiently mimics the physical principles of image formation creating an image which approximates an image produced by the physical camera. The procedure comprises four main elements: (1) the geometric relationships between the lens system, object, and film plane are modeled by precise placement and movement of lens elements, (2) image geometry is computed by using principles of geometric optics, (3) an exit pupil is calculated in order to define a region for efficiently sampling rays, (4) the image irradiance, or exposure at a pixel, is computed according to radiometric principles.

대표청구항 ▼

[ We claim:] [1.] A computer implemented method for rendering a three dimensional scene to generate a two dimensional image, the method comprising the steps of:(a) computing an exit pupil of a lens system;(b) selecting a ray that passes through the exit pupil to an image point on an image plane;(c)

[ We claim:] [1.] A computer implemented method for rendering a three dimensional scene to generate a two dimensional image, the method comprising the steps of:(a) computing an exit pupil of a lens system;(b) selecting a ray that passes through the exit pupil to an image point on an image plane;(c) tracing the ray from the three dimensional scene through the lens system to the image point;(d) calculating a radiance value for the ray;wherein the calculation of the radiance value for the ray in step (d) comprises setting the radiance value to zero if the ray is vignetted;(e) repeating steps (b)-(d) to obtain a plurality of radiance values; and(f) combining the plurality of radiance values to generate the two dimensional image on the image plane.