如何在MATLAB中的图像中找到局部最大值？

[poster]

我在MATLAB中有一张图片：

y = rgb2gray(imread('some_image_file.jpg')); 我想对其进行一些处理：

pic = some_processing(y); 并找到输出的局部最大值。也就是说， y中所有大于其所有邻居的点。

我似乎找不到MATLAB函数可以很好地做到这一点。我能想到的最好的是：

[dim_y,dim_x]=size(pic); enlarged_pic=[zeros(1,dim_x+2); zeros(dim_y,1),pic,zeros(dim_y,1); zeros(1,dim_x+2)]; % now build a 3D array % each plane will be the enlarged picture % moved up,down,left or right, % to all the diagonals, or not at all [en_dim_y,en_dim_x]=size(enlarged_pic); three_d(:,:,1)=enlarged_pic; three_d(:,:,2)=[enlarged_pic(2:end,:);zeros(1,en_dim_x)]; three_d(:,:,3)=[zeros(1,en_dim_x);enlarged_pic(1:end-1,:)]; three_d(:,:,4)=[zeros(en_dim_y,1),enlarged_pic(:,1:end-1)]; three_d(:,:,5)=[enlarged_pic(:,2:end),zeros(en_dim_y,1)]; three_d(:,:,6)=[pic,zeros(dim_y,2);zeros(2,en_dim_x)]; three_d(:,:,7)=[zeros(2,en_dim_x);pic,zeros(dim_y,2)]; three_d(:,:,8)=[zeros(dim_y,2),pic;zeros(2,en_dim_x)]; three_d(:,:,9)=[zeros(2,en_dim_x);zeros(dim_y,2),pic]; 然后查看沿第三维的最大值是否出现在第一层中（即： three_d(:,:,1) ）：

(max_val, max_i) = max(three_d, 3); result = find(max_i == 1); 还有其他更优雅的方法吗？这似乎有点不合时宜。


回答：
bw = pic > imdilate(pic, [1 1 1; 1 0 1; 1 1 1]);

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