Machine Vision Based Automatic Detection Method of Indicating Values of a Pointer Gauge

Table 1

Experimental samples.

Sample name	Image resolution	Sample character	The purpose of sample selection
The pressure gauge with many labels and a lot of writing on the dial.	1000/750	A lot of writing on the dial, which may influence the location of the dial center and the pointer segmentation.	Verify the robustness of the algorithm and the capability of resisting interference.
Flow gauge with the uneven scale.	500/500	Uneven distribution of the scale marks.	Verify the universality of the algorithm.