http://10.8.1.3/class/ 2026-06-25T07:03:51+00:00 http://10.8.1.3/class/ http://10.8.1.3/class/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2026-06-18T00:51:17+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?id=numericalipb:lecture2&rev=1781743877&do=diff 【数値情報処理b】第2回 輪郭抽出 画像処理で輪郭を抽出することを輪郭抽出（エッジ抽出）という。 画像で輪郭というと物体と物体の境目、あるいは物体と背景の境目である。 画像の濃度や色に急な変化があるところが輪郭に見えることを利用して、輪郭を抽出する。$f$$x$$y$$(x,y)$$g$$f$$(g*f)(x,y)$\[ (g*f)(x,y)=\sum_{i=1}^{3}\sum_{j=1}^{3}g(x+i-2,y+j-2)f(i,j) \]\begin{align*} \small &=\ \ g(x-1,y-1)f(1,1)&&+g(x,y-1)f(2,1)&&+g(x+1,y-1)f(3,1)\\ &\ \ \ +g(x-1,y\ \ \ \ \ \ \ )f(1,2)&&+g(x,y\ \ \ \ \ \ \ )f(2,2)&&+g(x+1,y\ \ \ \ \ \ \ )f(3,2)\\ &\ \ \ +g(x-1,y+1)f(1,3)&&+g(x,y+1)f(2,3)&&+g(x+1,y+1)f(3,3) \end{align*}$f(i,j)$$f$$g(x,y)$… text/html 2026-06-17T06:00:01+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipb%3A3d_edge.png&ns=numericalipb&rev=1781676001&tab_details=history&media_do=diff&do=media 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(yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipb%3Aconvolution.png&ns=numericalipb&rev=1781676001&tab_details=history&media_do=diff&do=media <img src="http://10.8.1.3/class/lib/exe/fetch.php?w=500&amp;h=500&amp;tok=2b9b08&amp;media=numericalipb:convolution.png" alt="convolution.png" loading="lazy" width="500" height="500" /> text/html 2026-06-10T01:33:05+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipb%3Arle.png&ns=numericalipb&rev=1781055185&tab_details=history&media_do=diff&do=media <img src="http://10.8.1.3/class/lib/exe/fetch.php?w=500&amp;h=500&amp;tok=231e14&amp;media=numericalipb:rle.png" alt="rle.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T05:04:20+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipb%3Asample_rgb.png&ns=numericalipb&rev=1780981460&tab_details=history&media_do=diff&do=media <img 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2026-06-09T05:04:20+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipb%3Apixel.png&ns=numericalipb&rev=1780981460&tab_details=history&media_do=diff&do=media <img src="http://10.8.1.3/class/lib/exe/fetch.php?w=500&amp;h=500&amp;tok=47f83d&amp;media=numericalipb:pixel.png" alt="pixel.png" loading="lazy" width="500" height="500" /> text/html 2026-06-09T05:04:20+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipb%3Aprimarycolors1.png&ns=numericalipb&rev=1780981460&tab_details=history&media_do=diff&do=media <img src="http://10.8.1.3/class/lib/exe/fetch.php?w=500&amp;h=500&amp;tok=489bc4&amp;media=numericalipb:primarycolors1.png" alt="primarycolors1.png" loading="lazy" width="500" height="500" /> text/html 2026-05-28T00:39:38+00:00 yuki (yuki@undisclosed.example.com) 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(yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipa%3Aeuler_n20.png&ns=numericalipa&rev=1779256836&tab_details=history&media_do=diff&do=media <img src="http://10.8.1.3/class/lib/exe/fetch.php?w=500&amp;h=500&amp;tok=70fb0a&amp;media=numericalipa:euler_n20.png" alt="euler_n20.png" loading="lazy" width="500" height="500" /> text/html 2026-05-20T06:00:36+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipa%3Aeuler_n10.png&ns=numericalipa&rev=1779256836&tab_details=history&media_do=diff&do=media <img src="http://10.8.1.3/class/lib/exe/fetch.php?w=500&amp;h=500&amp;tok=50e6d6&amp;media=numericalipa:euler_n10.png" alt="euler_n10.png" loading="lazy" width="500" height="500" /> text/html 2026-05-20T05:59:27+00:00 yuki (yuki@undisclosed.example.com) http://10.8.1.3/class/doku.php?image=numericalipa%3Aparabola.png&ns=numericalipa&rev=1779256767&tab_details=history&media_do=diff&do=media <img 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