Hough transformation and Detecting parallel lines

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Elie
Elie 2014-2-13
编辑： Nitin 2014-2-16
how can i compare edge of a rectangle with a theoretical line straight line and see if they are parallel and if they are not i want to rotate the rectangle until the side of it is parallel to the line. should i use hough transformation or what method best suites this application. Thank you.

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Nitin
Nitin 2014-2-16
编辑：Nitin 2014-2-16
I = imread('rectangle.jpg');
I2 = rgb2gray(I);
%Get the 2 lines
I3 = I2 > 60 & I2 < 75;
% Clean image
I4 = bwareaopen(I3,20);
%Search for lines in image and estimate angle between them using Hough

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