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Re-sampling and image resizing algorithm for multi-resolution video encoding and decoding
Re-sampling and image resizing algorithm for multi-resolution video encoding and decoding
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机译:用于多分辨率视频编码和解码的重采样和图像调整大小算法
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摘要
Techniques and tools for high accuracy position calculation for picture resizing in applications such as spatially-scalable video coding and decoding are described. In one aspect, resampling of a video picture is performed according to a resampling scale factor. The resampling comprises computation of a sample value at a position i,j in a resampled array. The computation includes computing a derived horizontal or vertical sub-sample position x or y in a manner that involves approximating a value in part by multiplying a 2n value by an inverse (approximate or exact) of the upsampling scale factor. The approximating can be a rounding or some other kind of approximating, such as a ceiling or floor function that approximates to a nearby integer. The sample value is interpolated using a filter.
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