MATLAB: How to fill rectangle with same color in image

fill colorImage Processing Toolboxrecognitionrectangle

Hi,

I want to fill rectangle with same color such as bellow image. So, i recognition it to rectangle or square.

Please, let me know.

Thanks.

Best Answer

I = imread('target1.png') ;
I1 = rgb2gray(I) ;
[y,x] = find(I1) ;
R = I(:,:,1) ; G = I(:,:,2) ; B = I(:,:,3) ;
x0 = min(x) ; x1 = max(x) ; 
y0 = min(y) ; y1 = max(y) ;
[X,Y] = meshgrid(x0:x1,y0:y1) ;
idx = sub2ind(size(I1),Y(:),X(:)) ;
I2 = I ;
C = [mean(R(idx)) mean(G(idx)) mean(B(idx))] ;
for i = 1:3
    T2 = I2(:,:,i) ;
    T2(idx) = C(i) ;
    I2(:,:,i) = T2 ;
end
imshow(I2)

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MATLAB: How to create a mask array to specify a region which represents a cross sectional area (peculiar shape) and omit square regions from a meshgrid

L = 5*10 ;
B = 20 ;
nx = 100 ;
ny = 100 ;
x = linspace(0,L,nx) ;
y = linspace(0,B,ny) ;
[X,Y] = meshgrid(x,y) ;
%%Get 10X10 grids 
idx1 = (X>=10 & X<=20) & (Y>=10 & Y<=20) ;
idx2 = (X>=30 & X<=40) & (Y>=10 & Y<=20) ;
%%plot
plot(X,Y,'.r')
hold on
plot(X(idx1),Y(idx1),'Ob')
plot(X(idx2),Y(idx2),'Ob')

MATLAB: Save coordinates by using impoly..

Try this:

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 = 20;
sourceImage = imread('peppers.png');
subplot(2, 2, 1);
imshow(sourceImage);
title('Original Image', 'FontSize', 20);
% 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') 
uiwait(msgbox('Draw a polygon.  Double click to accept/finish it'));
hPoly = impoly;
polyPoints = hPoly.getPosition
mask = hPoly.createMask;
subplot(2, 2, 2);
imshow(mask);
title('Mask', 'FontSize', 20);
croppedImage = sourceImage; % Initialize
% Set outside of polygon to black
croppedImage(~repmat(mask, 1, 1, 3)) = 0; 
x1 = round(min(polyPoints(:, 1)))
x2 = round(max(polyPoints(:, 1)))
y1 = round(min(polyPoints(:, 2)))
y2 = round(max(polyPoints(:, 2)))
% Do a rectangular crop
croppedImage = croppedImage(y1:y2, x1:x2, :);
subplot(2, 2, 3);
imshow(croppedImage);
title('Cropped Image', 'FontSize', 20);

Best Answer

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MATLAB: How to create a mask array to specify a region which represents a cross sectional area (peculiar shape) and omit square regions from a meshgrid

MATLAB: Save coordinates by using impoly..

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