{"id":180,"date":"2023-03-05T23:51:21","date_gmt":"2023-03-05T23:51:21","guid":{"rendered":"https:\/\/jassweb.com\/new22\/solved-how-can-i-detect-the-dimensions-of-an-object-under-an-angle-in-this-picture-in-matlab-closed\/"},"modified":"2023-03-05T23:51:21","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-2","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-2\/","title":{"rendered":"[Solved] How can I detect the dimensions of an object under an angle in this picture in MATLAB? [closed]"},"content":{"rendered":"<h2> Introduction <\/h2>\n<p>[ad_1]<\/p>\n<p>This question is about how to detect the dimensions of an object under an angle in a picture using MATLAB. MATLAB is a powerful tool for image processing and can be used to detect the dimensions of an object in a picture. In this article, we will discuss how to use MATLAB to detect the dimensions of an object under an angle in a picture. We will discuss the various techniques that can be used to detect the dimensions of an object in a picture and how to use MATLAB to implement them. We will also discuss the advantages and disadvantages of each technique and how to choose the best one for your application.<\/p>\n<h2> Solution<\/h2>\n<p><\/p>\n<p>The best way to detect the dimensions of an object under an angle in a picture in MATLAB is to use the Image Processing Toolbox. This toolbox provides a variety of functions for image analysis, including functions for measuring the size of objects in an image.<\/p>\n<p>For example, the regionprops function can be used to measure the size of objects in an image. This function takes an image as input and returns a structure containing information about the objects in the image, including their size.<\/p>\n<p>In addition, the imfindcircles function can be used to detect circles in an image. This function takes an image as input and returns the center and radius of any circles detected in the image. This can be used to measure the size of objects in an image that are circular in shape.<\/p>\n<p>Finally, the imfindline function can be used to detect lines in an image. This function takes an image as input and returns the endpoints of any lines detected in the image. This can be used to measure the size of objects in an image that are linear in shape. <\/p>\n<p><\/p>\n<div class=\"entry-content\" itemprop=\"text\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-1088640234840270\" crossorigin=\"anonymous\"><\/script><br \/>\n<script><\/p>\n<p><\/script><\/p>\n<p><\/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\u2019s 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 \u201cbattery\u201d 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 \u201cwhite\u201d\/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 \u201cstraighten\u201d 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 \u201cproject\u201d 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<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p> <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p>\n<\/div>\n<\/div>\n<p>solved How can I detect the dimensions of an object under an angle in this picture in MATLAB? [closed] <\/p>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-1088640234840270\" crossorigin=\"anonymous\"><\/script><br \/>\n<script><\/p>\n<p><\/script><\/div>\n<p>[ad_2]<\/p>\n<pre>\n\nMATLAB provides a number of tools for detecting the dimensions of an object under an angle in a picture. The most straightforward approach is to use the Image Processing Toolbox. This toolbox provides a number of functions for detecting objects in an image, including the regionprops function.\n\nThe regionprops function can be used to detect the dimensions of an object in an image. This function takes an image as an input and returns a structure containing information about the objects in the image. The structure contains information about the size, orientation, and other properties of the objects.\n\nTo detect the dimensions of an object under an angle in an image, the regionprops function can be used in conjunction with the imrotate function. The imrotate function takes an image as an input and rotates it by a specified angle. The regionprops function can then be used to detect the dimensions of the object in the rotated image.\n\nIn summary, MATLAB provides a number of tools for detecting the dimensions of an object under an angle in a picture. The most straightforward approach is to use the Image Processing Toolbox and the regionprops and imrotate functions.\n\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Introduction [ad_1] This question is about how to detect the dimensions of an object under an angle in a picture using MATLAB. MATLAB is a powerful tool for image processing and can be used to detect the dimensions of an object in a picture. In this article, we will discuss how to use MATLAB to &#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-2\/\" 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":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2253,6064,881,4251,516],"class_list":["post-180","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 v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How can I detect the dimensions of an object under an angle in this picture in MATLAB? 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