{"id":6779,"date":"2019-04-30T16:54:20","date_gmt":"2019-04-30T07:54:20","guid":{"rendered":"http:\/\/www.gisdeveloper.co.kr\/?p=6779"},"modified":"2020-05-28T11:37:03","modified_gmt":"2020-05-28T02:37:03","slug":"python%ea%b3%bc-opencv-30-siftscale-invariant-feature-transform%ec%9d%84-%ec%9d%b4%ec%9a%a9%ed%95%9c-%ec%9d%b4%eb%af%b8%ec%a7%80%ec%9d%98-%ed%8a%b9%ec%a7%95%ec%a0%90-%ec%b6%94%ec%b6%9c","status":"publish","type":"post","link":"http:\/\/www.gisdeveloper.co.kr\/?p=6779","title":{"rendered":"Python\uacfc OpenCV \u2013 33 : SIFT(Scale-Invariant Feature Transform)\uc744 \uc774\uc6a9\ud55c \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810 \ucd94\ucd9c"},"content":{"rendered":"<p>\uc774 \uae00\uc758 \uc6d0\ubb38\uc740 https:\/\/opencv-python-tutroals.readthedocs.io\/en\/latest\/py_tutorials\/py_feature2d\/py_sift_intro\/py_sift_intro.html \uc785\ub2c8\ub2e4.<\/p>\n<p>\uc774\uc804 \uae00\uc5d0\uc11c\ub294 \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810\uc744 Corner\ub85c \uac04\uc8fc\ud558\uc600\uc2b5\ub2c8\ub2e4. \uc774\ubbf8\uc9c0\ub97c \ud68c\uc804\ud574\ub3c4 \uadc0\ud241\uc774(Corner)\uc740 \uc5ec\uc804\uc774 \uadc0\ud241\uc774\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \ub9cc\uc57d \uc774\ubbf8\uc9c0\uc758 \ud06c\uae30\ub97c \ub298\ub838\uc744\ub54c\ub294 \uc5b4\ub5a8\uae4c\uc694? \uc544\ub798\uc758 \uadf8\ub9bc\uc744 \ubcf4\uba74..<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/2019\/04\/sift_scale_invariant.jpg\" alt=\"\" width=\"327\" height=\"135\" class=\"aligncenter size-full wp-image-6780\" \/><\/p>\n<p>\uc67c\ucabd\uc758 \uc774\ubbf8\uc9c0\uc5d0\uc11c \ucd08\ub85d\uc0c9 \uc0ac\uac01\ud615 \uc548\uc758 \ud615\uc0c1\uc740 Corner\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub2c8 \uc774 \uc774\ubbf8\uc9c0\ub97c \ud655\ub300\ud558\uace0 \ub3d9\uc77c\ud55c \ud06c\uae30\uc758 \ucd08\ub85d\uc0c9 \uc0ac\uac01\ud615 \uc548\uc758 \ud615\uc0c1\uc740 \ub354 \uc774\uc0c1 Corner\ub77c\uace0 \ubcf4\uae30 \uc5b4\ub835\uc2b5\ub2c8\ub2e4. \uc989, \uc774\uc804 \uc7a5\uc5d0\uc11c \uc0b4\ud3b4\ubcf8 \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810\uc73c\ub85c\uc368 Corner\ub97c \ub300\uc0c1\uc73c\ub85c \ud588\ub358 \ubc29\ubc95\uc740 \uc774\ubbf8\uc9c0\uc758 \ud655\ub300\uc5d0\uc11c \uc801\uc6a9\ud558\uae30 \uc5b4\ub835\uc2b5\ub2c8\ub2e4. \uc774\ucc98\ub7fc \uc774\ubbf8\uc9c0\uc758 \ud68c\uc804\ubfd0\ub9cc \uc544\ub2c8\ub77c \uc774\ubbf8\uc9c0\uc758 \ud06c\uae30\uac00 \ubcc0\uacbd\ub420\ub54c\uc5d0\ub3c4 \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810\uc744 \ucd94\ucd9c\ud574 \ub0bc \uc218 \uc788\ub294 \ubc29\ubc95\uc774 \ubc14\ub85c SIFT \uc785\ub2c8\ub2e4.<\/p>\n<p>SIFT\ub294 \ub2e4\uc74c\ucc98\ub7fc \ucd1d 4 \ub2e8\uacc4\uc758 \uc808\ucc28\ub97c \ud1b5\ud574 \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810\uc744 \ucd94\ucd9c\ud558\uace0 \ucd94\ucd9c\ud55c \ud2b9\uc9d5\uc810\uc744 \ud1b5\ud574 \ub9e4\uce6d\uc744 \uc218\ud589 \ud569\ub2c8\ub2e4.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/2019\/04\/SIFT_procedures.png\" alt=\"\" width=\"410\" height=\"749\" class=\"aligncenter size-full wp-image-6782\" \/><\/p>\n<p>OpenCV\ub294 SIFT\ub97c \uad6c\ud604\ud558\uc5ec \ubc14\ub85c \ud65c\uc6a9\ud560 \uc218 \uc788\ub3c4\ub85d \ud568\uc218\ub97c \uc81c\uacf5\ud558\ub294\ub370, \uc544\ub798\uc758 \uc608\uc81c\ub97c \uc0b4\ud3b4\ubcf4\uba74..<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">\r\nimport cv2\r\nimport numpy as np\r\n\r\nfilename = '.\/data\/home.jpg'\r\nimg = cv2.imread(filename)\r\ngray= cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)\r\n\r\nsift = cv2.xfeatures2d.SIFT_create()\r\nkp = sift.detect(gray,None)\r\n\r\nimg=cv2.drawKeypoints(gray,kp,None,flags=cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)\r\n\r\ncv2.imshow('img', img)\r\ncv2.waitKey()\r\ncv2.destroyAllWindows()\r\n<\/pre>\n<p>\uc704\uc758 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/2019\/04\/SIFT_run.png\" alt=\"\" width=\"515\" height=\"417\" class=\"aligncenter size-full wp-image-6784\" \/><\/p>\n<p>\uc0c1\ub2f9\uc774 \ub9ce\uc740 \ud2b9\uc9d5\uc810\uc774 \ucd94\ucd9c\ub418\uc5c8\ub294\ub370, \ucd94\ucd9c\ud55c \ud2b9\uc9d5\uc810\uc740 11\ubc88\uc758 \ucf54\ub4dc\uc5d0\uc11c cv2.drawKeypoints \ud568\uc218\ub97c \ud1b5\ud574 \uadf8\ub9b4 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub824\uc9c4 \ud2b9\uc9d5\uc810 \uac01\uac01\uc5d0\ub294 \ud2b9\uc9d5\uc810\uc758 \uc704\uce58, \ud2b9\uc9d5\uc810\uc758 \uc601\ud5a5 \ubc94\uc704\uc5d0 \ub300\ud55c \ubc18\uacbd, \uadf8\ub9ac\uace0 \ud68c\uc804\uc2dc \ud2b9\uc9d5\uc810\uc744 \uc2dd\ubcc4\ud560 \uc218 \uc788\ub294 \uac01\ub3c4\uac12\uc73c\ub85c\uc368\uc758 \ud2b9\uc9d5\uc810 \ubc29\ud5a5\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\ud2b9\uc9d5\uc810\uc73c\ub85c\uc368\uc758 keypoint\ub97c \ucd94\ucd9c\ud588\ub2e4\uba74, \uc774\uc81c \uc774 keypoint\ub97c \uac00\uc9c0\uace0 \uac01 keypoint\uc758 \uc2dd\ubcc4\uc790(Descriptor)\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4. 2\uac00\uc9c0 \ubc29\uc2dd\uc774 \uc788\ub294\ub370.. \uba3c\uc800 \uc55e\uc758 \uc608\uc81c\ucc98\ub7fc \uba3c\uc800 \ud0a4\ud3ec\uc778\ud2b8\ub97c \uc5bb\uace0 \ub09c\ub4a4, \uc774 \ud0a4\ud3ec\uc778\ud2b8\ub97c \uac00\uc9c0\uace0 \uc2dd\ubcc4\uc790\ub97c \uacc4\uc0b0\ud558\ub294 sift.coomput() \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95, \uc608\ub97c \ub4e4\uc5b4 kp, des = sift.compute(gray, kp) \uc640 \uac19\uc774 \uc2e4\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \uc55e\uc120 \uc608\uc81c\ucc98\ub7fc keypoint\ub97c \uba3c\uc800 \ucd94\ucd9c\ud558\uc9c0 \uc54a\uace0 keypoint\uc758 \uacc4\uc0b0\uacfc \ub3d9\uc2dc\uc5d0 \uae30\uc220\uc790\ub3c4 \ud568\uaed8 \uacc4\uc0b0\ud560 \uc218 \uc788\ub294 sift.detectAndConput() \ud568\uc218\uac00 \uc788\ub294\ub370, \uc544\ub798\uc758 \uc608\ucc98\ub7fc \ud568\uc218\ub97c \ud638\ucd9c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">\r\nsift = cv2.SIFT()\r\nkp, des = sift.detectAndCompute(gray,None)\r\n<\/pre>\n<p>\ud0a4\ud3ec\uc778\ud2b8\uc640 \uc2dd\ubcc4\uc790\ub97c \uc5bb\uc5c8\ub2e4\uba74, \uc774 \ud0a4\ud3ec\uc778\ud2b8\uc640 \uc2dd\ubcc4\uc790\ub97c \uc870\ud569\ud558\uc5ec \ud2b9\uc9d5\uc810\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc11c\ub85c \ub2e4\ub978 \uc774\ubbf8\uc9c0 \uc0ac\uc774\uc758 \ub3d9\uc77c\ud55c \uc704\uce58\ub97c \uc2dd\ubcc4\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub294 \ub2e4\ub978 \uae00\uc5d0\uc11c \uc0b4\ud3b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uc774 \uae00\uc758 \uc6d0\ubb38\uc740 https:\/\/opencv-python-tutroals.readthedocs.io\/en\/latest\/py_tutorials\/py_feature2d\/py_sift_intro\/py_sift_intro.html \uc785\ub2c8\ub2e4. \uc774\uc804 \uae00\uc5d0\uc11c\ub294 \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810\uc744 Corner\ub85c \uac04\uc8fc\ud558\uc600\uc2b5\ub2c8\ub2e4. \uc774\ubbf8\uc9c0\ub97c \ud68c\uc804\ud574\ub3c4 \uadc0\ud241\uc774(Corner)\uc740 \uc5ec\uc804\uc774 \uadc0\ud241\uc774\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \ub9cc\uc57d \uc774\ubbf8\uc9c0\uc758 \ud06c\uae30\ub97c \ub298\ub838\uc744\ub54c\ub294 \uc5b4\ub5a8\uae4c\uc694? \uc544\ub798\uc758 \uadf8\ub9bc\uc744 \ubcf4\uba74.. \uc67c\ucabd\uc758 \uc774\ubbf8\uc9c0\uc5d0\uc11c \ucd08\ub85d\uc0c9 \uc0ac\uac01\ud615 \uc548\uc758 \ud615\uc0c1\uc740 Corner\uc785\ub2c8\ub2e4. \uadf8\ub7ec\ub2c8 \uc774 \uc774\ubbf8\uc9c0\ub97c \ud655\ub300\ud558\uace0 \ub3d9\uc77c\ud55c \ud06c\uae30\uc758 \ucd08\ub85d\uc0c9 \uc0ac\uac01\ud615 \uc548\uc758 \ud615\uc0c1\uc740 \ub354 \uc774\uc0c1 Corner\ub77c\uace0 \ubcf4\uae30 \uc5b4\ub835\uc2b5\ub2c8\ub2e4. \uc989, \uc774\uc804 \uc7a5\uc5d0\uc11c \uc0b4\ud3b4\ubcf8 \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810\uc73c\ub85c\uc368 Corner\ub97c \ub300\uc0c1\uc73c\ub85c &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/www.gisdeveloper.co.kr\/?p=6779\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;Python\uacfc OpenCV \u2013 33 : SIFT(Scale-Invariant Feature Transform)\uc744 \uc774\uc6a9\ud55c \uc774\ubbf8\uc9c0\uc758 \ud2b9\uc9d5\uc810 \ucd94\ucd9c&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[130,131],"tags":[],"class_list":["post-6779","post","type-post","status-publish","format-standard","hentry","category-opencv","category-python"],"_links":{"self":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/6779","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6779"}],"version-history":[{"count":7,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/6779\/revisions"}],"predecessor-version":[{"id":9439,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/6779\/revisions\/9439"}],"wp:attachment":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6779"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6779"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}