MATLAB: How to know a square object’s orientation

image processingImage Processing ToolboxMATLABorientationrectanglesshape

Hello, I have to scan several images of rectangles and rotate 45º only the ones that already have a 45º rotation. I tried to find the orientation using regionprops with Orientation, but it doesn't work, for the rectangles that were diagonaly placed I found all diferent types of values like 3.5 or -4.7 to -68. Anyone know how to discover the orientation of rectangles?

Best Answer

Try getting the perimeter using bwboundaries() then using fitPolynomialRansac() (in the Computer Vision Toolbox) to get the equation of one of the sides.

boundaries = bwboundaries(binaryImage);

Then use regionprops() to find the centroid and bounding box

props = regionprops(binaryImage, 'BoundingBox', 'Centroid');

and crop it out and rotate it and paste it back in. I'm attaching copy and pasting image demos.

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MATLAB: Want to find the circular regions

Compute the circularities and determine the circularity that is the dividing line between a circle and non-circle

labeledImage = bwlabel(binaryImage);
props = regionprops(labeledImage, 'Area', 'Perimeter');
allAreas = [props.Area];
allPerimeters = [props.Perimeter];
circularities = allPerimeters .^ 2 ./ (4 * pi * allAreas);
acceptableCircs = circularities < 4; % Or whatever works
indexes = find(acceptableCircs);
circBlobsOnly = ismember(labeledImage, indexes);
imshow(circBlobsOnly);

MATLAB: Retrieve an object’s name

whos

x = whos;
idx = cellfun(@(x)strcmp(x,'double'),{x(:).class}); %change 'double' to your class
x(idx).name

Best Answer

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MATLAB: Want to find the circular regions

MATLAB: Retrieve an object’s name

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