function grayImage = CircleMaskImage(grayImage)
% Get the size of the image.
[imageSizeY, imageSizeX, numberOfColorChannels] = size(grayImage);
% Create a logical image of a circle with specified
% diameter, center, and image size.
% First create the image.
[columnsInImage, rowsInImage] = meshgrid(1:imageSizeX, 1:imageSizeY);
% Next create the circle in the image.
centerX = imageSizeX / 2;
centerY = imageSizeY / 2;
radius = 170;
% Display circle in the overlay above the current axes.
viscircles([centerX, centerY], radius, 'Color', 'r');
% Here is where we actually create the mask.
circlePixels = (rowsInImage - centerY).^2 ...
+ (columnsInImage - centerX).^2 <= radius.^2;
% circlePixels is a 2D "logical" array.
% Now, display it.
% image(circlePixels) ;
% colormap([0 0 0; 1 1 1]);
% title('Binary image of a circle');
% Set image outside the circle to some very bright value
% so it won't be selected when we do a threshold for dark stuff.
grayImage(~circlePixels) = 65535;
end
Kshitij Singh answered . 2024-05-17 19:51:37
There are several ways you can determine the starting and ending rows. I think the fastest is just this
[blobRows, blobColumns] = find(binaryImage); topRow = min(blobRows) bottomRow = max(blobRows)
You could also use regionprops and ask for the bounding box.
props = regionprops(binaryImage, 'BoundingBox'); topRow = props.BoundingBox(2) + 0.5 bottomRow = topRow + props.BoundingBox(4) - 1
Row 41 looks like it should do it to erase the nozzle:
% Do an closing to smooth out the edges.
se = strel('disk', 3, 0);
binaryImage = imclose(binaryImage, se);
%---------------------------------------------------------------------------
% Fill any holes that might be present
binaryImage = imfill(binaryImage, 'holes');
% Erase nozzle.
binaryImage(1:41, :) = false;
%---------------------------------------------------------------------------
% Extract the blob with the largest area.
numberToExtract = 1;
binaryImage = bwareafilt(binaryImage, numberToExtract);
% Display the image.
subplot(2, 3, 3);
imshow(binaryImage);
axis on;
title('Biggest Blob, Final Mask', 'FontSize', fontSize);
drawnow;
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