I need an algorithm to fill in the blank vertical path pixels.

I need an algorithm to fill in the blank vertical path pixels.

Answer 1

[Image Analyst]

You need an edge linking program. You basically need to label the lines with 8-connected pixels to give a label/number for each isolated line. Then you need to find the end points of each line and find the closest pixel on a line that has a different label/number. Then you need to draw a line connecting them.

See if you can adapt my attached edge linking demo.