MATLAB: How to show the coordinate automatically after plot the marker

coordinateimageimage processingplot

this is the code

   true
    %point location
row=find(sum(img8,2)==0,1,'last')+1;
col=find(img8(row,:)~=0);
row=row(ones(size(col)));
Points=[row(:) col(:)];
imshow(img8);
title('Highest Point Location')
hold on
plot(Points(:,2),Points(:,1),'rp','MarkerSize',10)

Best Answer

Do you mean you want a label near the plotted point? You could use the text command, using your Points variable to place it:

text(Points(1,2),Points(1,1),['This is (',num2str(Points(1,2)),',',num2str(Points(1,1)),')'])

You would then need to loop over your points.

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MATLAB: Extracting matrix row whose element which satisfy equation of a cirlce

What's the difficulty?

%points: nx2 matrix of points
%centre: 1x2 vector of circle centre
%radius: radius of circle
isincircle = sum((points - centre) .^2, 2) <= radius .^ 2;   %only works in R2016b
incirclepoints = points(isincircle, :)

If < R2016b,

isincircle = sum(bsxfun(@minus, points, centre) .^2, 2) <= radius .^ 2;

MATLAB: How to mark the highest white pixel through bottom to the top? using grayscale image.

The white pixels are the ones where all three color components R, G, and B equal 255, so you can get a 2D logical matrix of either white or non-white pixels like this:

I = imread('test.png'); 
white = sum(I,3)==3*255;

The highest white pixel in the image corresponds to the first white pixel in each column, so you can loop through columns going from left to right to find the first white pixel in each column:

row = nan(1,size(white,2)); % preallocates the rows.  
for k = 1:length(row) 
    try
        row(k) = find(white(:,k),1,'first');  
    end
end
imshow(I)
hold on
plot(1:k,row,'b-')

Best Answer

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MATLAB: Extracting matrix row whose element which satisfy equation of a cirlce

MATLAB: How to mark the highest white pixel through bottom to the top? using grayscale image.

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