Realization of a class of two-dimensional zero-phase recursive digital filters with variable cutoff boundary
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3 - Amélioration du filtre de Canny Deriche pour la détection des contours sous forme de rampe | Semantic Scholar
![EP0327445A1 - Generalised digital multiplier, and digital filter using this multiplier - Google Patents EP0327445A1 - Generalised digital multiplier, and digital filter using this multiplier - Google Patents](https://patentimages.storage.googleapis.com/00/e6/26/55a5909c6e03f9/imgb0018.png)
EP0327445A1 - Generalised digital multiplier, and digital filter using this multiplier - Google Patents
![EP0327445A1 - Generalised digital multiplier, and digital filter using this multiplier - Google Patents EP0327445A1 - Generalised digital multiplier, and digital filter using this multiplier - Google Patents](https://patentimages.storage.googleapis.com/29/2c/c8/f9c763d45ed067/imgb0010.png)