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    • 93. 发明授权
    • SIMD computation of rank based filters for M.times.N grids
    • MxN网格的基于秩的滤波器的SIMD计算
    • US06058405A
    • 2000-05-02
    • US965686
    • 1997-11-06
    • Priyadarshan KolteRoger Smith
    • Priyadarshan KolteRoger Smith
    • G06T5/20G06F17/10
    • G06T5/20Y10S707/99937
    • One way of filtering graphics images to remove pixel dropout and shot noise while preserving overall image quality is to use non-linear filters based on rank order of an M.times.N grid of pixel values surrounding a pixel to be filtered. This rank order filter method for M.times.N grids first sorts columns, then sorts rows, and finally sorts diagonals to obtain either just a median filter value, a rank-based filter value, or a complete sorted order of the M.times.N grid. All of the sort operations are control-flow-free allowing implementation on SIMD processors processing multiple overlapping M.times.N grids in parallel. Advantage is taken of columns and rows that are shared among the horizontally and vertically overlapping M.times.N grids in the digital image to reduce the total number of sort operations for the image.
    • 过滤图形图像以消除像素丢失和拍摄噪声同时保持整体图像质量的一种方法是使用基于要滤波的像素周围的像素值的M×N网格的秩顺序的非线性滤波器。 MxN网格的这种排序过滤器方法首先对列进行排序,然后对行进行排序,最后对对角线进行排序,以获得MxN网格的中值过滤器值,基于排序的过滤器值或完整排序顺序。 所有的排序操作都是无流控制的,允许在SIMD处理器上实现并行处理多个重叠的MxN网格。 优点在数字图像中的水平和垂直重叠的MxN网格之间共享的列和行,以减少图像的排序操作的总数。