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→Complex version: re-worded "Parseval relationship" to Parseval's identity |
m →Continuous version: link to tensor product |
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</math>
If the [[gradient]] <math>\nabla I = (I_x,I_y)^\text{T}</math> of <math>I</math> is viewed as a 2×1 (single-column) matrix, where <math>(.)^\text{T}</math> denotes [[transpose]] operation, turning a row vector to a column vector, the matrix <math>S_0</math> can be written as the [[matrix product]] <math>(\nabla I)(\nabla I)^\text{T}</math> or [[tensor product|tensor or outer product]] <math>\nabla I \otimes \nabla I</math>
===Discrete version===
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