I am translating a material on visual sensors and having a hard time figuring out what to call this.
The situation is that when the sensor senses a circle mark, sometimes it does not detect a fine circle. Instead, the circle becomes a little wavy, having some parts of outline sticking out of the real line, and some parts going inside.
I need to express the length of the difference between the real line and the off-points of the detected line. I came up with the following two expressions. Does either of them indicate what I am trying to say?
Positive/negative difference” OR “Positive/negative deviation length”.