MATLAB: How to get bounding boxes around rectangular rooms which are rotated by some angle

bounding boxroom segmentationrotated floor plan

I have a floorplan which is rotated with some angle. I do not know the angle. Can I get the bounding box around the rooms in floor plan . If it is not rotated, using regionprops(), I am able to get the bounding boxes. But if it is rotated, since the bounding box do not rotates, I am unable to get the bounding box around the rooms. I want to get the coordinates of those rooms. Is there any other way to get the coordinates of the rooms with/without using bounding box method?Or I sit possible to get the coordinates of the 4 line segments of each room which bound the rooms?

Best Answer

You could also use this FEX file to get the vertices of each room,

https://www.mathworks.com/matlabcentral/fileexchange/74181-find-vertices-in-image-of-convex-polygon

though you would have to generate an image of each room separately. You could also use it to find the corners of the convex hull of the floorplan.

Related Solutions

MATLAB: Crop dark area and display the face only

Convert to grayscale and then threshold and find the bounding box

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
imtool close all;  % Close all imtool figures.
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;
% Read in the color image.
folder = pwd;
baseFileName = 'm2.bmp';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
  % Didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
rgbImage = imread(fullFileName);
% Get the dimensions of the image.  numberOfColorBands should be = 3.
[rows, columns, numberOfColorBands] = size(rgbImage);
% Display the original color image.
subplot(2, 3, 1);
imshow(rgbImage, []);
axis on;
title('Original Color Image', 'FontSize', fontSize);
drawnow;
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Histogram the red channel, but there is a huge spike at 255 so let's not count those.
subplot(2, 3, 2);
grayImage = rgb2gray(rgbImage);
imshow(grayImage, []);
title('Gray Scale version', 'FontSize', fontSize);
subplot(2, 3, 3);
histogram(grayImage(grayImage<255))
grid on;
title('Histogram of Gray Scale Image', 'FontSize', fontSize);
someThresholdValue = 150;
binaryImage = grayImage > someThresholdValue;
% Take largest blob
binaryImage = bwareafilt(binaryImage, 1);
subplot(2, 3, 4);
imshow(binaryImage);
grid on;
title('Binary Image', 'FontSize', fontSize);
% Label the binary image.
labeledImage = bwlabel(binaryImage);
props = regionprops(labeledImage, 'BoundingBox');
bbox = props.BoundingBox
croppedImageRGB = imcrop(rgbImage, bbox);
subplot(2, 3, 5);
imshow(croppedImageRGB);
grid on;
title('Cropped RGB Image', 'FontSize', fontSize);
% Gray scale version of cropped image
croppedImageGray = imcrop(grayImage, bbox);
subplot(2, 3, 6);
imshow(croppedImageGray);
grid on;
title('Cropped Gray Scale Image', 'FontSize', fontSize);

MATLAB: How to get the coordinates of each room in a floor plan image through object identification method

One approach is to close all of the doors morphologically:

load('Walls')
e=ones(1,105);
A=imclose(imclose(~Image,e),e.');
B=imfill(A,'holes')&~A;
imshow(B)

Now, you can simply use regionprops to get all of the pixel coordinates in each room,

>> Rooms=regionprops(B,'PixelList')
Rooms = 
  3×1 struct array with fields:
    PixelList

Best Answer

Related Solutions

MATLAB: Crop dark area and display the face only

MATLAB: How to get the coordinates of each room in a floor plan image through object identification method

Related Question