I have 2 contours on the same plot and I want to differentiate them with colours so I can see the difference.

Question

muhammad choudhry 2020-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/560864-i-have-2-contours-on-the-same-plot-and-i-want-to-differentiate-them-with-colours-so-i-can-see-the-di

评论： muhammad choudhry 2020-7-7

Hi,

Please see the attaced Frame 16&17. In this image 2 contours from 2 consecutive frames are plot to analyse the change.

My question is how can I change the boundary colour of contour so I can easily differentiate between 2 or if I plot more contour on it.

I used the command below to plot the contours and would like the add on for coulour into it.

% contour of the image

figure()

imcontour(dif,2);

hold on

imcontour(dif1,2);

hold off

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darova 2020-7-7

Can you create an example? What do you mean by 'difference'?

muhammad choudhry 2020-7-7

在 MATLAB Online 中打开

Please see the attached!

I want to represent contours with different colour and then use the threshold value to reduce the disturbance

imcontour(dif,2,'LineColor','r');

But I am getting error!

Error using imcontour
Expected input number 3, I, to be one of these types:
uint8, int16, uint16, double, logical, single
Error in imcontour>ParseInputs (line 110)
validateattributes(a,{'uint8','int16','uint16','double','logical','single'}, ...
Error in imcontour (line 40)
[x,y,a,extra_args] = ParseInputs(varargin{:});
Error in RCGCoPixelMov (line 28)
imcontour(dif,2,'LineColor','r');

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Answer 1

Mehmed Saad 2020-7-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/560864-i-have-2-contours-on-the-same-plot-and-i-want-to-differentiate-them-with-colours-so-i-can-see-the-di#answer_462200

编辑：Mehmed Saad 2020-7-7

在 MATLAB Online 中打开

I = imread('rice.png');
figure,subplot(121),
imcontour(I);ax = gca;
colormap(ax,'cool')
subplot(122);
imcontour(I);ax = gca;
colormap(ax,'hot')

EDIT:

Change LineColor

I = imread('rice.png');
figure,
imcontour(I,'LineColor','r')
hold on
I = imread('cameraman.tif');
imcontour(I)

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Mehmed Saad 2020-7-7

编辑：Mehmed Saad 2020-7-7

在 MATLAB Online 中打开

dif = imread('rice.png');
figure()
imcontour(dif,2);
hold on
dif1 = imread('cameraman.tif');
imcontour(dif1,2);
hold off
cts = findobj(gca,'Type','contour');
cts(1).LineColor = 'flat';
cts(2).LineColor = 'r';