join close lines in one thicker

I have this image

How could I close the borders with just one continuous line? To something like this

Thank you

Answer 1

[Image Analyst]

Take the coordinates of the green lines and burn them into a binary image. See attached demo and adapt it.

Then use imclose() to enlarge and blend them into a bigger connected mass.

binaryImage = imclose(binaryImage, ones(9));

Then use bwareafilt() to extract out the largest blob:

binaryImage = bwareafilt(binaryImage, 1);

Then blacken the image where the white pixels are

% Mask the image using bsxfun() function to multiply the mask by each channel individually.
maskedRgbImage = bsxfun(@times, rgbImage, cast(~binaryImage, 'like', rgbImage));

[5mid]

Yes this is working for few lines, imline function is really slow. I have around 4k of lines to process. The image that I showed is just a cut.

[Image Analyst]

Maybe try calling plot() onto the image, then use getframe() to get the frame (though it might not be the same size anymore) and find the pure green pixels, then use imclose(). Might be a lot faster.

Answer 2

[prasanth s]

why matlab did not have functions to draw and burn basic shapes (line, triange,..) in image.i did not find any file exchange also.

[Image Analyst]

It does. See attached demos.

If you have the Computer Vision System Toolbox, you can also use insertShape().

[prasanth s]

Thanks...insertShape() thats what i needed.