How to convert image to one pixel?

How can I get from picture (main) to picture(convert) ?

I tried the following code but not the correct output.

originalImage=imread('main.png'); %
figure; imshow(originalImage)
binaryImage=im2bw(originalImage);
figure; imshow(binaryImage)

binaryImage_p = bwareaopen(binaryImage, 500);
figure; imshow(binaryImage_p)

skeletonImage = bwmorph(binaryImage, 'skel', inf);
figure; imshow(skeletonImage)