Searching for vectors of the starting point of arrows in the image

I have a code which read an input image and searches for a Arrow mark. I need to find the Pin point section of the arrow mark? How to search for the Arrow mark shape in the image? How to find the X,Y vectors of the pixel which is the closest point of the arrow tip? How to locate multiple arrow marks if possible? The arrow marks are single lines only with the inverted V making the tip. The line will be drawn by another user and will be shred to me.