| http://www.w3.org/ns/prov#value | - Once the gradient is calculated, the edge can be identified using any known and/or convenient operator and/or technique, including but not limited to a Canny edge detector or modification thereof, Sobel technique or modification thereof and/or any other technique involving a high-pass frequency filter, low pass frequency filter, bandpass filter, difference of Gaussians, FIR filter, convolution, fi
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