如何通过关联像素值缓冲像素？

Question

我可以使用哪些方法来缓冲像素的关联像素值？例如，左侧的图像显示光栅图像，其像素半径值范围为0 - 5（注意“黑色”值为0）。右边的图像显示了我尝试根据这些像素值生成的缓冲区。每个堆栈交换策略，我还包括一个MATLAB脚本，用于可重现的数据。

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% Generate a grid of 0s to begin with.
m = zeros(300, 400, 'uint8');

% Generate 1000 random pixels.
numRandom = 1000;
linearIndices = randi(numel(m), 1, numRandom);

% Assign a radius value of 1-5 for each pixel
m(linearIndices) = randi(5, [numel(linearIndices) 1]);

% Display it.  
image(m);
colormap(hot); 

Answer 1

一种方法：

% Generate a grid of 0's to begin with.
m = zeros(300, 400, 'uint8');

% Generate 1000 random pixels.
numRandom = 9;
linearIndices = randi(numel(m), 1, numRandom);

% Assign a radius value of 1-5 for each pixel
m(linearIndices) = randi(5, [numel(linearIndices) 1]);



%%
buffer = false(size(m));
for radius =1:5 % update to actual range
    im_r  = m==radius;
    se    = strel('disk',radius);
    im_rb = imfilter(im_r, double(se.getnhood()));

    buffer = buffer | im_rb;
end

imshowpair(m,buffer,'montage');