From points to closed contour

I have 6 points as shown in the picture above.

Can I make a closed contour from the 6 points as shown below?

I've tried to use creating ellipse and imfill() but they didn't work.

Thank you.

Answer 1

[Ameer Hamza]

Try this

im = im2double(imread('image.jpeg'));

im_gray = rgb2gray(im);
im_gray = imbinarize(im_gray)*1;

[r,c] = find(im_gray==1);
points = [c r];
p = convhull(points);
points = points(p, :).';
poly_points = points(:).';

im_gray = insertShape(im_gray, 'FilledPolygon', poly_points, ...
    'Color', [1 1 1], ...
    'Opacity', 1, ...
    'SmoothEdges', false);

imshow(im_gray);

[Yohanes Setiawan]

Thank you for your response.

Why r, c being [c r] in points?

[Yohanes Setiawan]

Anyway, I haven't had Computer Vision Toolbox :'(

I'm using MATLAB R2018b

[Ameer Hamza]

This code use image processing toolbox

im = im2double(imread('image.jpeg'));

im_gray = rgb2gray(im);
im_gray = imbinarize(im_gray)*1;

[r,c] = find(im_gray==1);
points = [c r];
p = convhull(points);
points = points(p, :);

im_gray = roipoly(im_gray, points(:,1), points(:,2));

imshow(im_gray);

[Yohanes Setiawan]

Thanks!

I've installed new version of MATLAB which has Computer Vision Toolbox.

Then I'm running your code and get this error:

Error using insertShape

Expected input number 1, I, to be one of these types:

uint8, uint16, int16, double, single

Instead its type was logical.

[Ameer Hamza]

Can you show your code?

[Yohanes Setiawan]

It has been solved!

I changed into double and WORKED!

Thank you so much for your help.

[Ameer Hamza]

I am glad to be of help.