jens
7b34529b24
git-svn-id: http://moon:8086/svn/matlab/trunk@91 801c6759-fa7c-4059-a304-17956f83a07c
27 lines
811 B
Matlab
27 lines
811 B
Matlab
function images = loadMNISTImages(filename)
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%loadMNISTImages returns a 28x28x[number of MNIST images] matrix containing
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%the raw MNIST images
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fp = fopen(filename, 'rb');
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assert(fp ~= -1, ['Could not open ', filename, '']);
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magic = fread(fp, 1, 'int32', 0, 'ieee-be');
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assert(magic == 2051, ['Bad magic number in ', filename, '']);
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numImages = fread(fp, 1, 'int32', 0, 'ieee-be');
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numRows = fread(fp, 1, 'int32', 0, 'ieee-be');
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numCols = fread(fp, 1, 'int32', 0, 'ieee-be');
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images = fread(fp, inf, 'unsigned char');
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images = reshape(images, numCols, numRows, numImages);
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images = permute(images,[2 1 3]);
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fclose(fp);
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% Reshape to #pixels x #examples
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images = reshape(images, size(images, 1) * size(images, 2), size(images, 3));
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% Convert to double and rescale to [0,1]
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images = double(images) / 255;
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end
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