A Correlation Based Strategy for the Acceleration of Nonlocal Means Filtering Algorithm

Figure 1

Two adjacent pixels and with their blocks and , and their search neighborhoods and . The pixels within the 11 × 11 blue block diagram represent the search neighborhood of the pixel , the 5 × 5 blue block diagram is the block of the pixel , and the centered blue block diagram is the pixel . The red block diagrams (from small to big) correspond to the pixel , block , and search neighbourhood , respectively.