MATLAB Answers

How to extract an object from an image

53 views (last 30 days)
I've got this code to extract a single cashew from a image containing multiple cashews. I need the extracted image to be RGB as well.
cashew_RGB = imread('White Wholes 180.jpg');
cashew_BW = img_BW(cashew_RGB);
cashew_stats = regionprops(bwlabel(cashew_BW),'BoundingBox');
cashew_single = imcrop(cashew_RGB,cashew_stats(i).BoundingBox);
I have attached the image and the user-defined function 'img_BW' which converts RGB image to black and white If you execute the code you'll find that the extracted cashew image has an invasion from the neighboring cashew. Is there any way to extract the cashew without such invasions? Thanks for your help!

  0 Comments

Sign in to comment.

Accepted Answer

Image Analyst
Image Analyst on 13 Dec 2015
You can't use the bounding box or else you may have incursions from another blob that juts into the bounding box. You have to use either PixelList from regionprops, or (easier) use ismember() with the blob you want to extract:
thisBlob = ismember(labeledImage, blobIndexToExtract) > 0;

  6 Comments

Show 3 older comments
Image Analyst
Image Analyst on 15 Dec 2015
Did it do it enough to let you officially "Accept this answer" and give me reputation points?
nour n
nour n on 10 Jan 2017
how to extract the object without the black background?
Jan
Jan on 10 Jan 2017
@nour: Please use flags for pointing out inproper use of the forum. Instead of attaching a new question as a comment, open a new thread. Thanks.

Sign in to comment.

More Answers (2)

r r
r r on 8 Aug 2018
I have an image I want to extract the small areas of black color within the blue How so؟؟؟

  1 Comment

Image Analyst
Image Analyst on 8 Aug 2018
Start your own new, separate question and I'll show you how.

Sign in to comment.


Arnab  Banerjee
Arnab Banerjee on 13 Sep 2019
first, convert to gray, by rgb2gray(), then find the perfect threshold of the region from the image matrix. it can be aslo done in RGB image if you knew the R:G:B ration of the threshold.
lastly, past the bounded area in a mask, or extract the partcular threshold

  0 Comments

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!