Hey, I wish to remove circles from my image by specifying its center and the radius. Its a bw image and i wish to specifically remove few selected circles by specifying their centers and radii. I know strel can be used but i am not able to figure out how to use it for this purpose. Thanks.
MATLAB: How to remove specific portions of a image
image processingImage Processing Toolbox
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This code will do it:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;format compact;fontSize = 25;%===============================================================================
% Get the name of the image the user wants to use.
baseFileName = 'eeewvwvwv.PNG'; % Assign the one on the button that they clicked on.
% Get the full filename, with path prepended.
folder = []; % Determine where demo folder is (works with all versions).
fullFileName = fullfile(folder, baseFileName);%===============================================================================% Read in a demo image.
grayImage = imread(fullFileName);% Get the dimensions of the image.
% numberOfColorChannels should be = 1 for a gray scale image, and 3 for an RGB color image.
[rows, columns, numberOfColorChannels] = size(grayImage);if numberOfColorChannels > 1 % It's not really gray scale like we expected - it's color.
% Use weighted sum of ALL channels to create a gray scale image.
grayImage = rgb2gray(grayImage); % ALTERNATE METHOD: Convert it to gray scale by taking only the green channel,
% which in a typical snapshot will be the least noisy channel.
% grayImage = grayImage(:, :, 2); % Take green channel.
end% Display the image.
subplot(2, 2, 1);imshow(grayImage, []);axis on;caption = sprintf('Original Gray Scale Image');title(caption, 'FontSize', fontSize, 'Interpreter', 'None');drawnow;hp = impixelinfo();% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')drawnow;% Binarize the image by thresholding.
mask = grayImage > 30;% Find the areas
props = regionprops(logical(mask), 'Area');allAreas = sort([props.Area])% Extract only blobs larger than 25.
mask = bwareaopen(mask, 25);% Get rid of white frame around outside border.
mask = imclearborder(mask);subplot(2, 2, 2);imshow(mask);axis on;axis image; % Make sure image is not artificially stretched because of screen's aspect ratio.
title('Binary Image Mask', 'fontSize', fontSize);drawnow;% Mask image to produce a masked gray scale image.
maskedGrayImage = grayImage; % First initialize.
maskedGrayImage(~mask) = 0; % Now mask
subplot(2, 2, 3);imshow(maskedGrayImage);axis on;axis image; % Make sure image is not artificially stretched because of screen's aspect ratio.title('Masked Gray Scale Image', 'fontSize', fontSize);drawnow;MATLAB: I want to extract information within 150-200. How can it be done???? Thanks in advance….. :)
This may do what you want:
[counts,binLocations] = imhist(c);histinfo = counts(150:200);
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