One-dimensional position indicator

Disclosed herein is a medical system (100, 300, 500) comprising: a memory (110) storing machine executable instructions, at least one set of predetermined coordinates (124), and a position identifying algorithm (122). The position identifying algorithm is configured for outputting a set of current coordinates (128) for each of the at least one set of predetermined coordinates in response to receiving a current image descriptive of an object (306, 310). The execution of machine executable instructions (120) causes a computational system (104) to repeatedly receive (200) a current image (126) from a camera system (304). The execution of machine executable instructions (120) causes a computational system (104) to perform the following for the current image: receive (202) the set of current coordinates for each of the at least one set of predetermined coordinates in response to inputting the current image into the position identifying algorithm; calculate (204) a positional difference (130) between the at least one set of predetermined coordinates and its set of current coordinates; calculate (206) a one-dimensional value (134) from positional difference using an objective function; and provide (208) a one-dimensional position indicator (136, 314, 600, 602, 608, 800, 900, 1002) for each of and controlled by each one-dimensional value in real time using a user interface (108, 308, 416, 418).