{"id":34436,"date":"2023-03-06T05:21:21","date_gmt":"2023-03-05T23:51:21","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-can-i-detect-the-dimensions-of-an-object-under-an-angle-in-this-picture-in-matlab-closed\/"},"modified":"2023-03-06T05:21:21","modified_gmt":"2023-03-05T23:51:21","slug":"solved-how-can-i-detect-the-dimensions-of-an-object-under-an-angle-in-this-picture-in-matlab-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-can-i-detect-the-dimensions-of-an-object-under-an-angle-in-this-picture-in-matlab-closed\/","title":{"rendered":"[Solved] How can I detect the dimensions of an object under an angle in this picture in MATLAB? [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-32228759\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"32228759\" data-parentid=\"32227347\" data-score=\"39\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Consider this as a beginner&#8217;s tutorial to Matlab image processing. Read the documentation of the commands used and try and <strong>understand<\/strong> what they are doing and why.<\/p>\n<h3>1. Read the image<\/h3>\n<p>Use <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/imread.html\"><code>imread<\/code><\/a> to read the image into a 3D matrix. For convenience, we convert it to <code>double<\/code> in the range [0..1] using <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/im2double.html\"><code>im2double<\/code><\/a>:<\/p>\n<pre><code>&gt;&gt; img = im2double( imread( 'path\/to\/battety.jpg' ) );\n<\/code><\/pre>\n<p>You can check out the size of your <code>img<\/code> using <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/size.html\"><code>size<\/code><\/a> command:<\/p>\n<pre><code>&gt;&gt; size( img )\nans =\n    1024         768           3\n<\/code><\/pre>\n<p>You can see from the result that your image has 1024 rows, 768 columns and 3 channels (Red, Green and Blue).<\/p>\n<h3>2. Convert to black and white (a.k.a thresholding)<\/h3>\n<p>As you can see the battery is significantly brighter than the background and is colorless. We can select pixels that have large gap between the brightest channel value to darkest channel values as &#8220;battery&#8221; pixels:<\/p>\n<pre><code>&gt;&gt; bw = (max(img,[],3)-min(img,[],3)) &gt; 0.2;\n<\/code><\/pre>\n<p>See <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/max.html\"><code>max<\/code><\/a> and <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/min.html\"><code>min<\/code><\/a> for more details.<br \/>\nThere are other methods to threshold an image, see <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/images\/ref\/graythresh.html\"><code>graythresh<\/code><\/a> for more details.<\/p>\n<p>Using <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/imshow.html\"><code>imshow<\/code><\/a> we can see what we got:<\/p>\n<pre><code>&gt;&gt; imshow(bw,[],'border','tight');\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/jassweb.com\/solved\/wp-content\/uploads\/2023\/03\/Solved-How-can-I-detect-the-dimensions-of-an-object.png\" alt=\"enter image description here\"><\/p>\n<p>Normally one uses <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/images\/morphological-filtering.html\">morphological operations<\/a> to improve thresholding results.<br \/>\nYou can use <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/images\/ref\/imclose.html\"><code>imclose<\/code><\/a>:<\/p>\n<pre><code>&gt;&gt; bw = imclose( bw, ones(25) );\n<\/code><\/pre>\n<p>Resulting with:<br \/><img decoding=\"async\" src=\"https:\/\/jassweb.com\/solved\/wp-content\/uploads\/2023\/03\/1678060281_116_Solved-How-can-I-detect-the-dimensions-of-an-object.png\" alt=\"enter image description here\"><\/p>\n<h3>3. find angle of rotation<\/h3>\n<p>A <em>very<\/em> useful command for processing and working with bw images is <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/images\/ref\/regionprops.html\"><code>regionprops<\/code><\/a>. It allows you to get all sorts of nice properties. You are going to use it to compute the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/images\/ref\/regionprops.html?searchHighlight=regionprops#inputarg_properties\"><code>'Orientation'<\/code><\/a> of the &#8220;white&#8221;\/battery region of your image<\/p>\n<pre><code>&gt;&gt; st = regionprops( bw, 'Orientation' )\nst = \nOrientation: 52.8694\n<\/code><\/pre>\n<p>As you can see the battery is rotated by 52.8 degrees.<br \/>\nUsing <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/images\/ref\/imrotate.html\"><code>imrotate<\/code><\/a> to &#8220;straighten&#8221; the battery<\/p>\n<pre><code>&gt;&gt; rbw = imrotate( bw, -st.Orientation );\n<\/code><\/pre>\n<p>Once the battery is axis-aligned, you can &#8220;project&#8221; the white pixels onto the horizontal and vertical axes using <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/any.html\"><code>any<\/code><\/a>:<\/p>\n<pre><code>&gt;&gt; pc = any( rbw, 2 ); %\/\/ project all rows into a single column \n&gt;&gt; pr = any( rbw, 1 ); %\/\/ project all columns into a single row\n<\/code><\/pre>\n<p>Now you need to find the first and last pixels set to 1 in the projections. Use <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.mathworks.com\/help\/matlab\/ref\/find.html\"><code>find<\/code><\/a> for that:<\/p>\n<pre><code>&gt;&gt; fx = find( pr, 1, 'first');  %\/\/ first x coordinate\n&gt;&gt; tx = find( pr, 1, 'last');   %\/\/ last x coordinat\n&gt;&gt; fy = find( pc, 1, 'first');  %\/\/ first y coordinate\n&gt;&gt; ty = find( pc, 1, 'last');   %\/\/ last y coordinate  \n<\/code><\/pre>\n<p>Once you have x,y coordinates of corners, you can plot them on the rotated image:<\/p>\n<pre><code>&gt;&gt; imshow(rbw,[],'border','tight');\n&gt;&gt; hold on; \n&gt;&gt; plot( [fx tx tx fx fx], [fy fy ty ty fy], ':r', 'LineWidth',3);\n<\/code><\/pre>\n<p>Yields:<br \/><img decoding=\"async\" src=\"https:\/\/jassweb.com\/solved\/wp-content\/uploads\/2023\/03\/1678060281_63_Solved-How-can-I-detect-the-dimensions-of-an-object.png\" alt=\"enter image description here\"><\/p>\n<p>And the coordinates are:<\/p>\n<pre><code>&gt;&gt; [fx fy tx ty]\nans =\n406   608   866   733\n<\/code><\/pre>\n<p>As you can see your battery is (866-406) pixels long and (733-608) pixels wide.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How can I detect the dimensions of an object under an angle in this picture in MATLAB? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Consider this as a beginner&#8217;s tutorial to Matlab image processing. Read the documentation of the commands used and try and understand what they are doing and why. 1. Read the image Use imread to read the image into a 3D matrix. For convenience, we convert it to double in the range [0..1] using im2double: &#8230; <a title=\"[Solved] How can I detect the dimensions of an object under an angle in this picture in MATLAB? [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-can-i-detect-the-dimensions-of-an-object-under-an-angle-in-this-picture-in-matlab-closed\/\" aria-label=\"More on [Solved] How can I detect the dimensions of an object under an angle in this picture in MATLAB? [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2253,6064,881,4251,516],"class_list":["post-34436","post","type-post","status-publish","format-standard","hentry","category-solved","tag-computer-vision","tag-edge-detection","tag-image-processing","tag-image-segmentation","tag-matlab"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] How can I detect the dimensions of an object under an angle in this picture in MATLAB? 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