{"id":246,"date":"2018-03-19T11:01:52","date_gmt":"2018-03-19T10:01:52","guid":{"rendered":"http:\/\/ldf.mendelu.cz\/testhardis\/?page_id=246"},"modified":"2018-06-11T20:57:21","modified_gmt":"2018-06-11T18:57:21","slug":"dic-methods","status":"publish","type":"page","link":"https:\/\/hardis.org\/?page_id=246","title":{"rendered":"DIC"},"content":{"rendered":"<p>Fotogrammetrick\u00e1 technika (ze zkratky DIC, tedy Digital Image Correlation) se st\u00e1v\u00e1 d\u016fle\u017eitou a bezkontaktn\u00ed metodou m\u011b\u0159en\u00ed pou\u017e\u00edvanou k m\u011b\u0159en\u00ed a vyhodnocov\u00e1n\u00ed deformac\u00ed p\u0159i dynamick\u00e9m zat\u00ed\u017een\u00ed.<\/p>\n<p>Metoda DIC spo\u010d\u00edv\u00e1 v zaznamen\u00e1v\u00e1n\u00ed a anal\u00fdze posunut\u00ed a deforma\u010dn\u00edch pol\u00ed na povrchu testovan\u00e9ho objektu za pou\u017eit\u00ed korelace digit\u00e1ln\u00edch obraz\u016f testovan\u00e9ho objektu zaznamenan\u00e9ho p\u0159i jeho p\u0159em\u00edst\u011bn\u00ed, nebo deformaci.<\/p>\n<p>P\u0159em\u00edst\u011bn\u00ed a deformace DIC lze m\u011b\u0159it pomoc\u00ed syst\u00e9mu jedn\u00e9, dvou nebo v\u00edce kamer. Pou\u017eit\u00ed jedn\u00e9 kamery umo\u017e\u0148uje ur\u010dit posuny a deformace testovan\u00e9ho vzorku pouze v rovin\u011b rovnob\u011b\u017en\u00e9 s rovinou obrazu maticov\u00e9 kamery. P\u0159i pou\u017eit\u00ed nejm\u00e9n\u011b dvou kamer pro z\u00e1znam obrazu testovan\u00e9ho objektu v r\u016fzn\u00fdch sm\u011brech, je mo\u017en\u00e9 m\u011b\u0159it posuny a deformace v trojrozm\u011brn\u00e9m prostoru.<\/p>\n<p>Algoritmus pou\u017e\u00edvan\u00fd pro anal\u00fdzu obrazu se skl\u00e1d\u00e1 ze t\u0159\u00ed z\u00e1kladn\u00edch krok\u016f:<\/p>\n<ol>\n<li>\u00a0Digit\u00e1ln\u00ed kamera syst\u00e9mu, kter\u00e1 analyzuje oblast vzorku, vyhled\u00e1v\u00e1 charakteristick\u00e9 body, kter\u00e9 se st\u00e1vaj\u00ed referen\u010dn\u00edmi body pro virtu\u00e1ln\u00ed s\u00ed\u0165 a pro diskretizaci analyzovan\u00e9 oblasti.<\/li>\n<li>Na z\u00e1klad\u011b zaznamenan\u00fdch zm\u011bn ve vzd\u00e1lenosti mezi body a \u010d\u00edseln\u00fdm vyhodnocen\u00edm je vytvo\u0159ena mapa vyta\u017een\u00ed a deformace pro cel\u00fd povrch materi\u00e1lu pozorovan\u00e9ho kamerou.<\/li>\n<li>Pro metodu DIC se pou\u017e\u00edvaj\u00ed dva modely odhadu:<\/li>\n<\/ol>\n<ul>\n<li>Normalizovan\u00e1 k\u0159\u00ed\u017eov\u00e1 korelace (NCC)<\/li>\n<li>Nejmen\u0161\u00ed-\u010dtvere\u010dky odpov\u00eddaj\u00edc\u00ed (LSM)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Fotogrammetrick\u00e1 technika (ze zkratky DIC, tedy Digital Image Correlation) se st\u00e1v\u00e1 d\u016fle\u017eitou a bezkontaktn\u00ed metodou m\u011b\u0159en\u00ed pou\u017e\u00edvanou k m\u011b\u0159en\u00ed a vyhodnocov\u00e1n\u00ed deformac\u00ed p\u0159i dynamick\u00e9m zat\u00ed\u017een\u00ed. Metoda DIC spo\u010d\u00edv\u00e1 v zaznamen\u00e1v\u00e1n\u00ed a anal\u00fdze posunut\u00ed a deforma\u010dn\u00edch pol\u00ed na povrchu testovan\u00e9ho objektu&#8230;<br \/><a class=\"read-more-button\" href=\"https:\/\/hardis.org\/?page_id=246\">\u010c\u00edst v\u00edce<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-246","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/hardis.org\/index.php?rest_route=\/wp\/v2\/pages\/246","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hardis.org\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/hardis.org\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/hardis.org\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/hardis.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=246"}],"version-history":[{"count":4,"href":"https:\/\/hardis.org\/index.php?rest_route=\/wp\/v2\/pages\/246\/revisions"}],"predecessor-version":[{"id":355,"href":"https:\/\/hardis.org\/index.php?rest_route=\/wp\/v2\/pages\/246\/revisions\/355"}],"wp:attachment":[{"href":"https:\/\/hardis.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}