Question

% obtain small windows of the image (say 16x16 windows and possibly using the crop function)
[rows columns] = size(B);
blockSizeR = 25; % Rows in block.
blockSizeC = 25; % Columns in block.
wholeBlockRows = floor(rows / blockSizeR);
wholeBlockCols = floor(columns / blockSizeC);
image3d = zeros(wholeBlockRows, wholeBlockCols);
sliceNumber = 1;
dataStruct = [];
for row = 1 : blockSizeR : rows
    for col = 1 : blockSizeC : columns
        row1 = row;
        row2 = row1 + blockSizeR - 1;
        col1 = col;
        col2 = col1 + blockSizeC - 1;
        oneBlock = B(row1:row2, col1:col2);
        subplot(4, 4, sliceNumber);
        imshow(oneBlock);
        caption = sprintf('Block #%d of 16', sliceNumber);
        title(caption);
        drawnow;
        dataStruct = [dataStruct, oneBlock(:)];
        sliceNumber = sliceNumber + 1;
    end
end

我试图从100x100像素图像中提取16个25x25子窗口，然后将每个子窗口转换为125列向量，但是我附加所有这些向量的数据结构似乎是625 x 16而不是125 x 16。

子窗口似乎在图中显示得很好。关于我哪里出错的任何线索都会非常感激。

Answer 1

您可以使用mat2cell和cellfun：

dataStruct = mat2cell( B, blockSizeR * ones(  1, wholeBlockRows ), ...
                          blockSizeC * ones(  1, wholeBlockCols ) );
dataStruct = cellfun( @(x) x(:), dataStruct, 'uni', 0 );
dataStruct = [dataStruct{:}];

matlab将子窗口转换为向量

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