I want to use Vectorization tools: Polyline Follower to convert from Raster to Vector this image (Bitonal...I dont' have permission to insert this image ) I want to have orthogonal line. I thought that it’s easy and in one click from the beginning of the Raster I can change it to Vector but the Polyline didn't continue to the end of the Raster and is not orthogonal.

May be I have to change VTools follower parameter or change the Raster before converting it. I want to use Polyline follower and one click because I have many images like this to convert from raster to vector....

Thank you