matlab实现拉普拉斯金字塔

以下是Matlab实现拉普拉斯金字塔的代码和步骤：

1.读取图像并将其转换为灰度图像。

img = imread('image.jpg');
gray_img = rgb2gray(img);

2.构建高斯金字塔。

G = gray_img;
GaussianPyramid = {G};
for i = 1:5
    G = impyramid(G, 'reduce');
    GaussianPyramid{i+1} = G;
end

3.构建拉普拉斯金字塔。

LaplacianPyramid = cell(1,5);
for i = 1:5
    G = GaussianPyramid{i};
    [m,n] = size(G);
    G_expand = impyramid(G, 'expand');
    G_expand = G_expand(1:m, 1:n);
    LaplacianPyramid{i} = G - G_expand;
end

4.将拉普拉斯金字塔合并为一张图像。

L = LaplacianPyramid{5};
for i = 4:-1:1
    G = impyramid(L, 'expand');
    [m,n] = size(LaplacianPyramid{i});
    G = G(1:m, 1:n);
    L = LaplacianPyramid{i} + G;
end

5.显示结果。

imshow(L);