{"id":1547,"date":"2014-12-05T09:34:09","date_gmt":"2014-12-05T14:34:09","guid":{"rendered":"https:\/\/blogs.mathworks.com\/videos\/?p=1547"},"modified":"2014-12-05T09:34:09","modified_gmt":"2014-12-05T14:34:09","slug":"selectively-changing-an-image-in-matlab-with-logical-indexing","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/videos\/2014\/12\/05\/selectively-changing-an-image-in-matlab-with-logical-indexing\/","title":{"rendered":"Selectively Changing an Image in MATLAB with Logical Indexing"},"content":{"rendered":"A <a href=\"http:\/\/uk.mathworks.com\/matlabcentral\/answers\/165441-how-do-i-delete-values-of-grayscale-under-0-5-in-a-matrix\">MATLAB user on MATLAB Answers wanted to know how to change all the pixels in an image that were below a certain threshold<\/a>.  The answer was correct, but very terse.  I wanted to expand upon the question with an explanation of logical indexing in MATLAB.\r\n<p>\r\n<p>\r\n\r\n\r\n<div><div class=\"row\"><div class=\"col-xs-12 containing-block\"><div class=\"bc-outer-container add_margin_20\"><videoplayer><div class=\"video-js-container\"><video data-video-id=\"3993719960001\" data-video-category=\"blog\" data-autostart=\"false\" data-account=\"62009828001\" data-omniture-account=\"mathwgbl\" data-player=\"rJ9XCz2Sx\" data-embed=\"default\" id=\"mathworks-brightcove-player\" class=\"video-js\" controls><\/video><script src=\"\/\/players.brightcove.net\/62009828001\/rJ9XCz2Sx_default\/index.min.js\"><\/script><script>if (typeof(playerLoaded) === 'undefined') {var playerLoaded = false;}(function isVideojsDefined() {if (typeof(videojs) !== 'undefined') {videojs(\"mathworks-brightcove-player\").on('loadedmetadata', function() {playerLoaded = true;});} else {setTimeout(isVideojsDefined, 10);}})();<\/script><\/div><\/videoplayer><\/div><\/div><\/div>\r\n <\/div>","protected":false},"excerpt":{"rendered":"<div class=\"thumbnail thumbnail_asset asset_overlay video\"><a href=\"https:\/\/blogs.mathworks.com\/videos\/2014\/12\/05\/selectively-changing-an-image-in-matlab-with-logical-indexing\/?dir=autoplay\"><img decoding=\"async\" src=\"https:\/\/cf-images.us-east-1.prod.boltdns.net\/v1\/static\/62009828001\/311cf11a-bc44-460f-9382-7c82f1043dfa\/a1c71a81-3736-4ddc-8e7a-1405c83804e6\/1280x720\/match\/image.jpg\" onError=\"this.style.display ='none';\"\/>\n      <div class=\"overlay_container\">\n      <span class=\"icon-video icon_color_null\"><time class=\"video_length\">2:51<\/time><\/span>\n      <\/div>\n      <\/a><\/div><p>A MATLAB user on MATLAB Answers wanted to know how to change all the pixels in an image that were below a certain threshold.  The answer was correct, but very terse.  I wanted to expand upon the&#8230; <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/videos\/2014\/12\/05\/selectively-changing-an-image-in-matlab-with-logical-indexing\/\">read more >><\/a><\/p>","protected":false},"author":68,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,17],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/1547"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/users\/68"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/comments?post=1547"}],"version-history":[{"count":5,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/1547\/revisions"}],"predecessor-version":[{"id":1553,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/posts\/1547\/revisions\/1553"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/media?parent=1547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/categories?post=1547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/videos\/wp-json\/wp\/v2\/tags?post=1547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}