MATLAB: Changing the background color

image processing

How do we change the background colour of a boundary in the image?

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That really depends on the context. I have sometimes converted the image to greyscale and then called bwlabel. With that you can simply find out the label of the (1,1) position.

If you are talking about the background of a figure, look at the figure properties with fig_h=figure;get(fig_h) and see the options for yourself.

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MATLAB: Find the intersecting points

If you have the image in hand.

Get the locations/ positions i.e (x,y) for both the regions using logical indexing.
Get the boundary of both the regions using boundary.
Use InterX from the link: https://in.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections?focused=5165138&tab=function

If you have points (x,y) straight away follow from step 2 in the above.

MATLAB: How to detect background color of image

If you can make the assumption that the majority of the pixels in the image are the background color, then

[rows, columns] = size(binaryImage);
numWhitePixels = sum(binaryImage);
numBlackPixels = rows * columns - numWhitePixels;
if numWhitePixels > numBlackPixels 
    % Background is white.
    % Do nothing at all.
else
    % Background is black.
    % Make image all white, everywhere at every pixel.
    binaryImage(:) = true;
end

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MATLAB: Find the intersecting points

MATLAB: How to detect background color of image

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