| 摘要 |
Systems and methods for forward mapping are provided, which accumulate and resolve over all samples forward mapped to each pixel bin. The invention uses a pixel, or sub-pixel, binning approach that accumulates and resolves over all samples, and performs particularly well compared to prior architectures in areas that have higher frequency content, solving the minification antialiasing problem and producing a high quality result. A filter determines the value(s) to assign to each pixel based upon accumulation and resolution, e.g., taking the mean, taking the median, taking the mode, taking the minimum, taking the maximum, applying a least squares fit or applying some other function, of all of the sample points that fall within the pixel bin(s), rather than assigning a value by selecting only the point sample that corresponds to the center of the pixel. During accumulation and resolution of each of the samples, since a point sample from a forefront object and a point sample from an occluded object may be received by the same bin, wherein only the former should be accumulated and resolved according to the accumulation and resolution process, a Z-range, or Z-interval, is assigned to each sample instead of the conventional Z-value. The Z-range is a function of the Z-value. Analysis of the overlapping of these Z-ranges then determines which samples are to be accumulated and resolved together according to the accumulation and resolution process, and which are not. Gaps or holes left by conventional forward-mapping techniques are thus eliminated more simply by oversampling the source(s), and interpolated points are generated at a higher rate than the original source signal(s) to adequately cover the destination bins, while Z-buffer visibility in the destination bins is addressed in an efficacious manner. A variety of image processing applications are contemplated wherein forward mapping, and accumulation and resolution of forward mapped point samples can be applied, ranging from 4-D graphics applications to applications wherein images recorded in a recording/storage environment are mapped to the arbitrary requirements of a display environment.
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