Farid and Simoncelli Derivatives Image derivatives

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and 7-tap filter is



as example first order derivatives can computed in following using matlab in order perform convolution



it noted farid , simoncelli have derived first derivative coefficients more accurate compared ones provided above. however, latter consistent second derivative interpolator and, therefore, better use if both first , second derivatives sought. in opposite case, when first derivative desired, optimal first derivative coefficients should employed; more details can found in paper.








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