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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
200        139        53        23        250        244
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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