Patent ID: 7432935

Claim:
A computer-implemented method of generating a pixel value for a pixel in an image displayable via a display device, the pixel value being representative of a point in a scene, the method comprising: generating a set of sample points, at least one sample point being generated using at least one sample, the at least one sample comprising at least one element of a sequence, wherein the set of sample points comprises quasi-Monte Carlo points, and wherein the generating comprises adaptively sampling by using radical inversion-based points; evaluating a selected function at one of the sample points to generate a value, the generated value corresponding to the pixel value, the pixel value being usable to generate a display-controlling electronic output; wherein a pixel is deemed refined whenever a refinement criterion is met, and wherein the refinement criterion can include comparing the image gradient against a predefined threshold T; and selecting a value, for an exponent for a coefficient to be multiplicatively applied to the threshold T, to enable adaptation to the speed of convergence, wherein the coefficient is the sampling rate.