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resonant(½ð±Ò+3):¸ÐлÌṩ£º-£© 2010-05-02 13:06
yibanxinyu(½ð±Ò+5):·Ç³£¸Ðл~ 2010-05-03 21:18
% K½üÁÚÆ½»¬Â˲¨
% input - ÊäÈëͼÏñ¾ØÕó£»n - Ä£°å´óС£¨3£¬5£¬7...£©£»k - ½üÁÚÊý
% output - Â˲¨´¦ÀíºóµÄͼÏñ¾ØÕó
function output = emuchKNNMeanFilter(input, n, k)
    [row, col] = size(input);
    edgeWidth = floor(n / 2);
    output = zeros(row - edgeWidth * 2, col - edgeWidth * 2);
    for i = 1 + edgeWidth : row - edgeWidth
        for j = 1 + edgeWidth : col - edgeWidth
            mask = input(i - edgeWidth : i + edgeWidth,...
                j - edgeWidth : j + edgeWidth);
            center = input(i, j);
            vertex = Matrix2Vertex(mask);
            neighbour = GetNeighbour(vertex, center, k);
            output(i - 1, j - 1) = mean(neighbour);
        end
    end
end

% ¸ù¾ÝÊäÈëµÄÏòÁ¿ÓëÖÐÐÄֵȡ½üÁÚÖµ
% vertex - ÊäÈëÏòÁ¿£»center - ÖÐÐÄÖµ£»k - ½üÁÚÊý
% neighbour - ½üÁÚÖµ
function neighbour = GetNeighbour(vertex, center, k)
    distance = abs(vertex - center);
    [sortDistance, sortIndex] = sort(distance,1);
    neighbour = vertex(sortIndex(2 : k + 1));
end

% ½«¾ØÕóת»»ÎªÏòÁ¿
function vertex = Matrix2Vertex(matrix)
    [row, col] = size(matrix);
    vertex = zeros(row * col, 1);
    for i = 1 : row * col
        vertex(i) = matrix(i);
    end
end

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a =
164        24        196        119        209        51
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125        218        11        129        247        86
103        67        39        20        147        38
224        198        183        42        60        84
181        163        33        191        74        29
211        185        56        85        172        197
3        228        116        78        146        202
µ÷ÓóÌÐò½øÐд¦Àí£ºb = emuchKNNMeanFilter(a, 3, 5)
µÃµ½´¦ÀíºóµÄ¾ØÕó
b =
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126.8        40.4        56.4        171.2
92.2        53.8        56.2        121.2
170.8        132.2        45.2        53.4
191.6        105.8        114.8        60
179.8        95        71.4        164.2
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holmescn

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yibanxinyu

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yibanxinyu

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