MATLAB错误：‘conv2’

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MATLAB错误

Undefined function 'conv2' for input arguments of type 'double' and attributes 'full 3d real'.

原因：Color images are 3 dimensional arrays (x,y,color). conv2 is only defined for 2-dimensions, so it won't work directly on a 3-dimensional array.

解决办法：

Three options:

• Use an n-dimensional convolution, convn()

• Convert to a grayscale image using rgb2gray(), and filter in 2D:

  filter_g = conv2(gauss,rgb2gray(img_double));

• Filter each color (RGB) separately in 2D:

  filter_g = zeros(size(im_double));
  for i = 1:3
    filter_g(:,:,i) = conv2(gauss, im_double(:,:,i);
  end