Diff of EdgeDetection

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[[ImageProcessing]]

- [[Sobel]]
- [[Prewitt]]

*. [#k578b63a]

- 1次微分（差分）によるエッジ検出
--  http://www.mis.med.akita-u.ac.jp/~kata/image/sobelprew.html

- Edge detection with ImageMagick
--  https://blog.jiayu.co/2019/05/edge-detection-with-imagemagick/