Comments on: Using ismember with the output of regionprops http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/ Steve Eddins manages the Image & Geospatial development team at The MathWorks and coauthored Digital Image Processing Using MATLAB. He writes here about image processing concepts, algorithm implementations, and MATLAB. Fri, 10 Feb 2012 18:55:59 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Rahul http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24730 Rahul Thu, 08 Dec 2011 14:54:09 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24730 Great work. Really very much important ; little little things are explained very very much well...!! thank you so much..!! Great work. Really very much important ; little little things are explained very very much well…!! thank you so much..!!

]]> By: Luis http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24724 Luis Sun, 04 Dec 2011 10:21:49 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24724 Hi Steve, I have an image with big blue blobs, an image with small red blobs and an image with small green blobs. I want to identify blue blobs that have: a) no small blobs, b)green small blobs, c)red small blobs and d) both green and red small blobs; when all 3 images are superimposed. I've tried using regionprops centroids but something goes wrong with the loops. Any suggestion? Thank you! Hi Steve,
I have an image with big blue blobs, an image with small red blobs and an image with small green blobs. I want to identify blue blobs that have: a) no small blobs, b)green small blobs, c)red small blobs and d) both green and red small blobs; when all 3 images are superimposed. I’ve tried using regionprops centroids but something goes wrong with the loops. Any suggestion? Thank you!

]]> By: Steve http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24336 Steve Mon, 18 Jul 2011 15:55:27 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24336 Sum—There isn't an existing Image Processing Toolbox function that will do it for you automatically. To implement it, I would probably dilate the region, use a logical operation to identify the dilated pixels that are not part of the original region, and then use the locations of those pixels to index into a label matrix to find the labels of adjacent regions. I'll put this on my list of potential blog topics. Sum—There isn’t an existing Image Processing Toolbox function that will do it for you automatically. To implement it, I would probably dilate the region, use a logical operation to identify the dilated pixels that are not part of the original region, and then use the locations of those pixels to index into a label matrix to find the labels of adjacent regions. I’ll put this on my list of potential blog topics.

]]> By: sum http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24330 sum Mon, 18 Jul 2011 04:17:50 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24330 For each labelled region is there a way to find a list of regions which surround the region? For each labelled region is there a way to find a list of regions which surround the region?

]]> By: Steve http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24285 Steve Tue, 21 Jun 2011 12:45:11 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24285 Mutlu—See my <a href="http://blogs.mathworks.com/steve/2011/06/21/advanced-maneuvers-with-regionprops/" rel="nofollow">21-Jun-2011 post</a>. Mutlu—See my 21-Jun-2011 post.

]]> By: Mutlu http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24250 Mutlu Mon, 30 May 2011 18:00:58 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24250 Hi Steve - I have two images - one contains class labels (one of 1 or 2) and one containing image segment (region) unique IDs. I am trying to use regionprops (or something like regionprops) to figure out most frequently occurring label from the label image per region and generate a new image where each unique region contains this most frequently occurring label. Is there a way to do this? Thank you very much. Hi Steve – I have two images – one contains class labels (one of 1 or 2) and one containing image segment (region) unique IDs. I am trying to use regionprops (or something like regionprops) to figure out most frequently occurring label from the label image per region and generate a new image where each unique region contains this most frequently occurring label. Is there a way to do this? Thank you very much.

]]> By: Steve http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24201 Steve Fri, 13 May 2011 14:06:29 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-24201 Maria—I assume you mean the mean intensity of pixel values in some other grayscale image, since the mean intensity of binary image objects is 1. If the grayscale image is called A, then this would do the trick: <pre class="code"> stats = regionprops(img_bright_bw, A, 'MeanIntensity'); </pre> Maria—I assume you mean the mean intensity of pixel values in some other grayscale image, since the mean intensity of binary image objects is 1. If the grayscale image is called A, then this would do the trick:

stats = regionprops(img_bright_bw, A, 'MeanIntensity');
]]> By: Mayur http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-23994 Mayur Sat, 05 Mar 2011 07:04:01 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-23994 Hey I want to calculate the aspect ratios of bounding boxes of different blobs in my binary image. and then retain only those with aspect ratios less than 0.3. How can i do this. How can i convert the structure array of bounding box to a vector.. Hey I want to calculate the aspect ratios of bounding boxes of different blobs in my binary image. and then retain only those with aspect ratios less than 0.3. How can i do this.

How can i convert the structure array of bounding box to a vector..

]]> By: Maria http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-23984 Maria Mon, 28 Feb 2011 17:28:08 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-23984 Hi, Steve, I find 5 objects in a binary image. I can get Centroid values of each object. How do I use the property "MeanIntensity" of regionprops() to calculate each object's mean intensity? <pre> [L,N]=bwlabel(img_bright_bw); stats2=regionprops(L,'Area', 'Centroid', 'BoundingBox'); stats2=regionprops(L,'all'); idx = find([stats2.Area] > 50); ob1=stats2(1).Centroid; </pre> Many thanks! Maria Hi, Steve,

I find 5 objects in a binary image. I can get Centroid values of each object. How do I use the property “MeanIntensity” of regionprops() to calculate each object’s mean intensity?

[L,N]=bwlabel(img_bright_bw);

stats2=regionprops(L,'Area', 'Centroid', 'BoundingBox');
stats2=regionprops(L,'all');
idx = find([stats2.Area] > 50);
ob1=stats2(1).Centroid;

Many thanks!
Maria

]]> By: Christine http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-23850 Christine Thu, 13 Jan 2011 11:21:39 +0000 http://blogs.mathworks.com/steve/2009/02/27/using-ismember-with-the-output-of-regionprops/#comment-23850 Ah, so the boarder pixels are part of the object, not around it. Thanks Steve! Ah, so the boarder pixels are part of the object, not around it. Thanks Steve!

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