Patent ID: 8071967

Claim:
A trolley wire wear measuring device, comprising: a processor configured to obtain a pair of line sensor images in which luminance signals of scanning lines, obtained by two line sensors, are arranged in time series, one of the two line sensors shooting a pantograph contact surface of a light-applied trolley wire, and the other of the two line sensors shooting the pantograph contact surface of a non-light-applied trolley wire; a differential processor configured to perform a differential process to create a line sensor image in which an illuminated worn area of the trolley wire is emphasized by determining a difference of luminance between the pair of line sensor images; a binary operation processor configured to perform a binary operation process on the line sensor image obtained by the differential process to create a binary operated image in which a worn portion of the trolley wire is emphasized; an edge detector configured to detect side edges of the worn portion in the binary operated image; and a worn portion width calculator configured to calculate a point-to-point distance of the both side edges as a whole width of the worn portion of the trolley wire in the binary operated image and determine a worn portion width of the trolley wire using this whole width.