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Returns image gradients (dy, dx) for each color channel.

Both output tensors have the same shape as the input: [batch_size, h, w, d]. The gradient values are organized so that [I(x+1, y) - I(x, y)] is in location (x, y). That means that dy will always have zeros in the last row, and dx will always have zeros in the last column.

image Tensor with shape [batch_size, h, w, d].

Pair of tensors (dy, dx) holding the vertical and horizontal image gradients (1-step finite difference).

ValueError If image is not a 4D tensor.