MATLAB: Rotate a selected object in an image around a predefined point on Image

imageimage acquisitionimage analysisimage processingImage Processing Toolboximage segmentationrotation

I have defined my object with the below function.

imshow(I);
h = impoly; 
M = ~h.createMask();
I(M) = 0;

As an example I have attached an image with rotated object inside. I would be grateful if you could help me with that. The rotation angle, center point and distance from the center point is defined previously.

Best Answer

You have to crop the image, use imcrop(). Then rotate using imrotate(). After that it's just geometry and pasting. See attached copy and paste demo.

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MATLAB: I’m trying to rotate an image without imrotate. My output image is unintelligible. Would appreciate any help. Sharing the code, input and output images.

newImg is a double. Try making it uint8:

newImg = zeros(nRowsNew,nColsNew,3, 'uint8');

MATLAB: Split image using a predefined line

Sure. I'm going to assume the line cuts across the entire image. Then use poly2mask() to create a binary image.

mask = poly2mask(x, y);

Then you can either blacken above/below the line.

imageAbove = grayImage;
imageAbove(mask) = 0;
imageBelow = grayImage;
imageBelow(~mask) = 0;

You can also crop to the bounding box or leave it at the original size, using imcrop() or regular indexing.

Best Answer

Related Solutions

MATLAB: I’m trying to rotate an image without imrotate. My output image is unintelligible. Would appreciate any help. Sharing the code, input and output images.

MATLAB: Split image using a predefined line

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