How to join between each edge? I am used Sobel Edge Detection. It will result MATLAB fill code some error. Is there any method can be used?

the edge do not connect to each other at binary image.

how to connect each of the edge to another?

here is my output and my code

Answer 1

[Image Analyst]

For columns where there is no edge, just propagate the edge from the prior column. Start with the "bad" binary image, bw:

[rows, columns] = size(bw);
lastRow = rows; % Initialize
for col = 1 : columns
    thisColumn = bw(:, col);
    if max(thisColumn) < 1
        % No white pixel found in this column
        % Propagate the last row from the prior column.
        bw(lastRow:end, col) = true;
    end
    % Update the last row.
    lastRow = find(bw(:, col), 1, 'first');
end