{"id":45180,"date":"2021-06-15T23:11:52","date_gmt":"2021-06-15T14:11:52","guid":{"rendered":"https:\/\/www.charlezz.com\/?p=45180"},"modified":"2021-06-15T23:21:20","modified_gmt":"2021-06-15T14:21:20","slug":"%ec%95%88%eb%93%9c%eb%a1%9c%ec%9d%b4%eb%93%9c%eb%a1%9c-%eb%b0%b0%ec%9a%b0%eb%8a%94-opencv-%ec%98%81%ec%83%81%ec%9d%98-%ea%b7%b8%eb%9e%98%eb%94%94%ec%96%b8%ed%8a%b8gradient","status":"publish","type":"post","link":"https:\/\/charlezz.com\/?p=45180","title":{"rendered":"[\uc548\ub4dc\ub85c\uc774\ub4dc\ub85c \ubc30\uc6b0\ub294 OpenCV] \uc601\uc0c1\uc758 \uadf8\ub798\ub514\uc5b8\ud2b8(Gradient)\uc640 \uc5e3\uc9c0\uac80\ucd9c"},"content":{"rendered":"

Gradient<\/h1>\n

\uadf8\ub798\ub514\uc5b8\ud2b8\ub780\u00a0 x\ubc29\ud5a5\uc73c\ub85c \ubbf8\ubd84\uacfc y\ubc29\ud5a5\uc73c\ub85c\uc758 \ubbf8\ubd84\uc744 \ub530\ub85c \uacc4\uc0b0\ud558\uace0 \uadf8\uac78 \ud558\ub098\ub85c \ubb36\uc5b4\uc11c \ubca1\ud130\ub85c \ud45c\ud604 \ud55c\uac83\uc744 \ub9d0\ud55c\ub2e4.<\/p>\n

\uc544\ub798\uc758 [\uadf8\ub9bc1]\uc740 \uc6d0\ubcf8\uc774\ubbf8\uc9c0 \ubc0f \uc6d0\ubcf8\uc774\ubbf8\uc9c0\uc5d0 \uc18c\ubca8\ud544\ud130<\/a>\ub97c x \ubc0f y \ubc29\ud5a5\uc73c\ub85c \uc801\uc6a9\ud558\uace0, \uac00\uc2dc\uc131\uc744\uc704\ud574 delta\uac12\uc744 \ucd94\uac00\ub85c 128 \uc801\uc6a9\ud55c \uc601\uc0c1\uc774\ub2e4.<\/p>\n

\"\"<\/a><\/p>\n

[\uadf8\ub9bc1]<\/p>\n<\/div>\n

\uc218\ud559\uc801 \uae30\ud638\ub85c \uadf8\ub798\ub514\uc5b8\ud2b8\ub97c \ud45c\ud604\ud560\ub54c\ub294 \uc5ed\uc0bc\uac01\ud615(\u25bd)<\/span>\uc73c\ub85c \ud45c\ud604\ud55c\ub2e4.<\/p>\n

\"\"<\/a><\/p>\n

\uc704\uc758 \uc218\uc2dd\uc744 \uc0b4\ud3b4\ubcf4\uba74 \uadf8\ub798\ub514\uc5b8\ud2b8 \u25bdf <\/em>\ub294 x\ucd95\uacfc y\ucd95\uc73c\ub85c \uac01\uac01 \ud3b8\ubbf8\ubd84<\/a>\ud558\uc5ec f<\/em>x\uc640 f<\/em>y\uc758 \ud589\ub82c \ud615\ud0dc\ub85c \ud45c\ud604\ud558\uace0 \uc788\ub2e4. \ub2e4\uc2dc \ud55c\ubc88 \uac15\uc870\ud558\uc790\uba74, \uadf8\ub798\ub514\uc5b8\ud2b8\ub77c\ub294 \uac83\uc740 x\ubc29\ud5a5\uc758 \ubbf8\ubd84\uc131\ubd84\uacfc y\ubc29\ud5a5\uc758 \ubbf8\ubd84\uc131\ubd84\uc744 \ud568\uaed8 \ud558\ub098\uc758 \ubca1\ud130\ud615\ud0dc\ub85c \ud45c\ud604\ud558\uace0 \uc788\ub2e4\ub294 \uc810\uc774\ub2e4.<\/span><\/p>\n

\ubcf4\ud1b5 \ubca1\ud130\ub294 2\ucc28\uc6d0 \ud3c9\uba74\uc0c1\uc5d0\uc11c \ub2e4\uc74c\uacfc \uac19\uc774 \ud55c \uc810\uc758 \ud615\ud0dc\ub85c \ud45c\ud604\uc774 \ub41c\ub2e4. \ube68\uac04\uc810<\/strong>\uc744 \uc0b4\ud3b4\ubcf4\uc790.<\/p>\n

\"\"<\/a><\/p>\n

\uc6d0\uc810\uc73c\ub85c\ubd80\ud130 \ube68\uac04\uc810\uae4c\uc9c0\uc758 \uae38\uc774\uac00 magnitude<\/strong>\ub77c\uace0 \ud558\ub294 \uadf8\ub798\ub514\uc5b8\ud2b8\uc758<\/strong> \ud06c\uae30(=\ubca1\ud130\uc758 \ud06c\uae30)<\/strong>\uc774\uace0 \uc774\ub97c \uad6c\ud558\ub294 \uacf5\uc2dd\uc740 \uc720\ud074\ub9ac\ub514\uc5b8 \uac70\ub9ac<\/a>\ub97c \uad6c\ud558\ub294 \uacf5\uc2dd\uacfc \ub3d9\uc77c\ud558\ub2e4.<\/p>\n

\"\"<\/a><\/p>\n

\uadf8\ub798\ub514\uc5b8\ud2b8\uc758 \ubc29\ud5a5(=\ubca1\ud130\uc758 \ubc29\ud5a5)\uc740 x\ucd95\uacfc \uc774\ub8e8\ub294 \uac01\ub3c4 \u03b8\ub85c \ud45c\ud604\ud558\ub294\ub370 \uc5ed\ud0c4\uc820\ud2b8<\/a>\ub97c \ud1b5\ud574 \uad6c\ud560 \uc218 \uc788\ub2e4.\"\"<\/a><\/span><\/p>\n

\uc774\ubbf8\uc9c0\uc5d0\uc11c \uadf8\ub798\ub514\uc5b8\ud2b8 \ud06c\uae30\ub294 \uc778\uc811\ud558\ub294 \ud53d\uc140 \uac12\uc774 \uc5bc\ub9c8\ub098 \ucc28\uc774\uac00 \ub098\ub294\uc9c0 \ubcf4\uc5ec\uc8fc\uace0, \uadf8\ub798\ub514\uc5b8\ud2b8\uc758 \ubc29\ud5a5\uc740 \ud53d\uc140 \uac12\uc758 \ubcc0\ud654\ub7c9\uc774 \uc5b4\ub290\ucabd\uc73c\ub85c \uae09\uaca9\ud558\uac8c \uc99d\uac00\ud558\ub294\uc9c0 \ub098\ud0c0\ub0b8\ub2e4.<\/p>\n

\"\"<\/a><\/p>\n

OpenCV\uc5d0\uc11c\ub294 \uadf8\ub798\ub514\uc5b8\ud2b8\uc758 \ud06c\uae30\uc640 \ubc29\ud5a5\uc744 \uacc4\uc0b0\ud558\uae30 \uc704\ud55c \ud568\uc218\ub97c \uc81c\uacf5\ud55c\ub2e4.<\/p>\n

magnitude : \ubca1\ud130\uc758 \ud06c\uae30 \uacc4\uc0b0 \ud568\uc218
\nphase : \ubca1\ud130\uc758 \ubc29\ud5a5 \uacc4\uc0b0 \ud568\uc218\u00a0<\/p>\n

2D \ubca1\ud130\uc758 \ud06c\uae30 \uacc4\uc0b0\uc744 \ub3c4\uc640\uc8fc\ub294 magnitude \ud568\uc218\uc758 \uc778\uc790\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4 .<\/p>\n

Core.magnitude(Mat x, Mat <\/span>y, Mat <\/span>magnitude)<\/pre>\n
x : 2D\ubca1\ud130\uc758 x\uc88c\ud45c \ud589\ub82c. \uc2e4\uc218\ud615\r\ny : 2D\ubca1\ud130\uc758 y\uc88c\ud45c \ud589\ub82c. x\uc640 \uac19\uc740 \ud06c\uae30. \uc2e4\uc218\ud615\r\nmagnitude : 2D\ubca1\ud130\uc758 \ud06c\uae30 \ud589\ub82c. x\uc640 \uac19\uc740 \ud06c\uae30, \uac19\uc740 \ud0c0\uc785. \uc720\ud074\ub9ac\ub514\uc5b8 \uac70\ub9ac \uad6c\ud558\ub294 \ubc29\ubc95\uc73c\ub85c \uacb0\uacfc \ub3c4\ucd9c\r\n<\/pre>\n
2D \ubca1\ud130\uc758 \ubc29\ud5a5 \uacc4\uc0b0\uc744 \ub3c4\uc640\uc8fc\ub294 phase \ud568\uc218\uc758 \uc778\uc790\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n
Core.phase<\/span>(Mat x, <\/span>Mat y, <\/span>Mat angle, boolean <\/span>angleInDegrees)<\/pre>\n
x : 2D\ubca1\ud130\uc758 x\uc88c\ud45c \ud589\ub82c. \uc2e4\uc218\ud615\r\ny : 2D\ubca1\ud130\uc758 y\uc88c\ud45c \ud589\ub82c. x\uc640 \uac19\uc740 \ud06c\uae30. \uc2e4\uc218\ud615\r\nangle : 2D \ubca1\ud130\uc758 \ud06c\uae30 \ud589\ub82c. x\uc640 \uac19\uc740 \ud06c\uae30, \uac19\uc740 \ud0c0\uc785.\r\n        angle(I) = atan2(y(I), x(I)) \r\n        \ub9cc\uc57d x(I) = y(I) = 0\uc774\uba74 angle\uc740 0\uc73c\ub85c \uc124\uc815\ub428.\r\nangleInDegrees : true\uc774\uba74 \uac01\ub3c4 \ub2e8\uc704, false\uc774\uba74 radian \ub2e8\uc704 <\/pre>\n
\uadf8\ub798\ub514\uc5b8\ud2b8\uc640 \uc5e3\uc9c0 \uac80\ucd9c \uc608\uc81c<\/h2>\n
\uc704\uc5d0\uc11c \ubc30\uc6b4 \ub0b4\uc6a9\uc744 \ud1a0\ub300\ub85c \ub808\ub098 \uc774\ubbf8\uc9c0\uc758 \uc5e3\uc9c0\ub97c \uac80\ucd9c\ud574\ubcf4\uc790. \uac00\uc7a5 \uba3c\uc800 \ud574\uc57c \ud560 \uc77c\uc740 \uadf8\ub798\ub514\uc5b8\ud2b8\uc758 \ud06c\uae30(magnitude)\ub97c \uad6c\ud558\ub294 \uac83\uc774\ub2e4. x \ubc0f y\ubc29\ud5a5\uc73c\ub85c \uc18c\ubca8\ud544\ud130<\/a>\ub97c \uc801\uc6a9\ud55c \ud589\ub82c \ub450\uac1c\ub97c \uc900\ube44\ud558\uc5ec magnitude \ud568\uc218\uc758 \uc778\uc790\ub85c \uc804\ub2ec \ud558\uc790.<\/p>\n
\/\/x\ubc29\ud5a5\uc73c\ub85c \uc18c\ubca8\ud544\ud130 \uc801\uc6a9\r\nval dx = Mat()\r\nImgproc.Sobel(src, dx, CvType.CV_32F, 1, 0, 3)\r\n\r\n\/\/y\ubc29\ud5a5\uc73c\ub85c \uc18c\ubca8\ud544\ud130 \uc801\uc6a9\r\nval dy = Mat()\r\nImgproc.Sobel(src, dy, CvType.CV_32F, 0, 1, 3)\r\n\r\n\/\/\uc704\uc758 \ub450\uac1c\uc758 \ud589\ub82c\uc744 \uc774\uc6a9\ud558\uc5ec \uadf8\ub77c\ub514\uc5b8\ud2b8 \ud06c\uae30 \uad6c\ud558\uae30\r\nvar mag = Mat()\r\nCore.magnitude(dx, dy, mag)<\/pre>\n
\uc774\ub807\uac8c \ud574\uc11c mag\ub97c \ucd9c\ub825\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 \uc601\uc0c1\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4.<\/p>\n
\"\"<\/a><\/p>\n
\ud53d\uc140\uac12\uc758 \ubcc0\ud654\ub7c9\uc5d0 \ub530\ub77c \uc5e3\uc9c0\uac00 \ubc1d\uac8c \ud45c\ud604\ub418\ub294 \uac83\uc744 \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/p>\n
\uc5ec\uae30\uc5d0 threshold\ub97c \uc801\uc6a9\ud558\uc5ec \ud2b9\uc815 \ubc1d\uc740 \uc5e3\uc9c0\ub9cc \ub0a8\ub3c4\ub85d \uc218\uc815\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 \uc774\ubbf8\uc9c0\ub97c \uc5bb\uc744 \uc218 \uc788\ub2e4.<\/p>\n
\"\"<\/a><\/p>\n
\uc5e3\uc9c0\uac00 \uc880 \ub450\ud23c\ud558\uae34 \ud558\uc9c0\ub9cc \uc5b4\ub290\uc815\ub3c4 \uc6d0\ud558\ub294 \uacb0\uacfc\ub97c \uc5bb\uc744 \uc218 \uc788\uac8c \ub418\uc5c8\ub2e4.<\/p>\n
\ucd5c\uc885 \uc18c\uc2a4 \ucf54\ub4dc<\/a>\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n
val src = ... \/\/ \ub808\ub098 \uc774\ubbf8\uc9c0 \r\n\r\n\/\/ \ud751\ubc31\uc73c\ub85c \uc804\ud658\r\nImgproc.cvtColor(src, src, Imgproc.COLOR_BGR2GRAY)\r\n\r\n\/\/x\ubc29\ud5a5\uc73c\ub85c \uc18c\ubca8\ud544\ud130 \uc801\uc6a9\r\nval dx = Mat()\r\nImgproc.Sobel(src, dx, CvType.CV_32F, 1, 0, 3)\r\n\r\n\/\/y\ubc29\ud5a5\uc73c\ub85c \uc18c\ubca8\ud544\ud130 \uc801\uc6a9\r\nval dy = Mat()\r\nImgproc.Sobel(src, dy, CvType.CV_32F, 0, 1, 3)\r\n\r\n\/\/\uc704\uc758 \ub450\uac1c\uc758 \ud589\ub82c\uc744 \uc774\uc6a9\ud558\uc5ec \uadf8\ub77c\ub514\uc5b8\ud2b8 \ud06c\uae30 \uad6c\ud558\uae30\r\nvar mag = Mat()\r\nCore.magnitude(dx, dy, mag)\r\n\r\n\/\/ Float\ud615\uc73c\ub85c \uacc4\uc0b0\ub41c \uacb0\uacfc\uae30 \ub54c\ubb38\uc5d0 \ube44\ud2b8\ub9f5\uc73c\ub85c \ud45c\ud604 \ud560 \uc218 \uc788\ub294 \ud0c0\uc785\uc73c\ub85c \ubcc0\uacbd\r\nmag.convertTo(mag, CvType.CV_8UC1)\r\n\r\n\/\/ \ub69c\ub837\ud55c \uc5e3\uc9c0\ub9cc \uac80\ucd9c\ud558\uae30 \uc704\ud574 \ubc1d\uc740 \ud53d\uc140\ub9cc \uac80\ucd9c\r\nImgproc.threshold(mag, mag, 70.0, 255.0, Imgproc.THRESH_BINARY)<\/pre>\n","protected":false},"excerpt":{"rendered":"
Gradient \uadf8\ub798\ub514\uc5b8\ud2b8\ub780\u00a0 x\ubc29\ud5a5\uc73c\ub85c \ubbf8\ubd84\uacfc y\ubc29\ud5a5\uc73c\ub85c\uc758 \ubbf8\ubd84\uc744 \ub530\ub85c \uacc4\uc0b0\ud558\uace0 \uadf8\uac78 \ud558\ub098\ub85c \ubb36\uc5b4\uc11c \ubca1\ud130\ub85c \ud45c\ud604 \ud55c\uac83\uc744 \ub9d0\ud55c\ub2e4. \uc544\ub798\uc758 [\uadf8\ub9bc1]\uc740 \uc6d0\ubcf8\uc774\ubbf8\uc9c0 \ubc0f \uc6d0\ubcf8\uc774\ubbf8\uc9c0\uc5d0 \uc18c\ubca8\ud544\ud130\ub97c x \ubc0f y \ubc29\ud5a5\uc73c\ub85c \uc801\uc6a9\ud558\uace0, \uac00\uc2dc\uc131\uc744\uc704\ud574 delta\uac12\uc744 \ucd94\uac00\ub85c 128 \uc801\uc6a9\ud55c \uc601\uc0c1\uc774\ub2e4. \uc218\ud559\uc801 \uae30\ud638\ub85c \uadf8\ub798\ub514\uc5b8\ud2b8\ub97c \ud45c\ud604\ud560\ub54c\ub294 \uc5ed\uc0bc\uac01\ud615(\u25bd)\uc73c\ub85c \ud45c\ud604\ud55c\ub2e4. \uc704\uc758 \uc218\uc2dd\uc744 \uc0b4\ud3b4\ubcf4\uba74 \uadf8\ub798\ub514\uc5b8\ud2b8 \u25bdf \ub294 x\ucd95\uacfc y\ucd95\uc73c\ub85c \uac01\uac01 \ud3b8\ubbf8\ubd84\ud558\uc5ec fx\uc640 fy\uc758 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[27],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/45180"}],"collection":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=45180"}],"version-history":[{"count":6,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/45180\/revisions"}],"predecessor-version":[{"id":45200,"href":"https:\/\/charlezz.com\/index.php?rest_route=\/wp\/v2\/posts\/45180\/revisions\/45200"}],"wp:attachment":[{"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=45180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=45180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/charlezz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=45180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}