- clear all;
close all;
clc;
%% start
filename = 'untitled.png';
I = imread(filename);
info = imfinfo(filename);
thres = graythresh(I);
I2 = ~(im2bw(I, thres));
cmp = bwconncomp(I2);
S = regionprops(cmp, {'BoundingBox'});
bbox = vertcat(S.BoundingBox);
x = bbox(:,3);
y = bbox(:,4);
res = info.ResolutionUnit;
resX = info.XResolution;
resY = info.YResolution;
if strcmp(res, 'Inch')
lebar = 2.54 * x / resX;
tinggi = 2.54 * y / resY;
else
lebar = x / resX;
tinggi = y / resY;
end
fprintf('X Resolution = %.2f %s\n', resX, res);
fprintf('Y Resolution = %.2f %s\n', resY, res);
disp('Size of Object:');
fprintf('Width = %.2f cm\n', lebar);
fprintf('Height = %.2f cm\n', tinggi);
- for the image attached i'm getting zero value.how to mask tht rectangular region?
Hi Leena,
First of all, the following line in your code:
I2 = ~(im2bw(I, thres));
Should be:
I2 = (im2bw(I, thres));
~ (complement) results in the background being an input to the regionprops function, while your regions of interest are the objects within the image.
You will then have 8 objects which correspond to the rectangles.
Second, the reason why you are getting zero is because of the display precision which you set to 2 , you need to increase it to 4 or more decimal places. The denominator (resX and resY) is too large.
fprintf('X Resolution = %.4f %s\n', resX, res);
fprintf('Y Resolution = %.4f %s\n', resY, res);
disp('Size of Object:');
fprintf('Width = %.4f cm\n', lebar);
fprintf('Height = %.4f cm\n', tinggi);
X Resolution = 2834.0000 meter
Y Resolution = 2834.0000 meter
Size of Object:
Width = 0.0060 cm
Width = 0.0064 cm
Width = 0.0064 cm
Width = 0.0124 cm
Width = 0.0074 cm
Width = 0.0095 cm
Width = 0.0049 cm
Width = 0.0092 cm
Height = 0.0025 cm
Height = 0.0018 cm
Height = 0.0021 cm
Height = 0.0116 cm
Height = 0.0028 cm
Height = 0.0042 cm
Height = 0.0035 cm
Height = 0.0032 cm
hi check the link its useful for you
http://in.mathworks.com/matlabcentral/newsreader/view_thread/80365
Try the MajorAxisLenght and MinorAxisLenght of each object outputted from regionprops function.
Regards,
Dr.Giri
Sorry but the MajorAxisLenght and MinorAxisLenght don't necessarily reflect the width and height of an object.
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