A quantum edge detection algorithm based on the sequency-ordered Walsh-Hadamard transform and a quantum high-pass filter achieves O(log N) circuit depth when state preparation is excluded.
Quantum algorithm for linear systems of equa- tions
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Quantum algorithm for edge detection in digital grayscale images
A quantum edge detection algorithm based on the sequency-ordered Walsh-Hadamard transform and a quantum high-pass filter achieves O(log N) circuit depth when state preparation is excluded.