The image subtracting method and the point to arc projection extremum algorithm can derive the pointer and scale marks quickly, and separate the long and short graduation line.

The feature and figure indication of graduation line in thermodetector figure are detailed analysed, therefore the key algorithm think and edit feature of system program are reflected.

The fits became more frequent, delaying his graduation from high school and, later, preventing him from holding down a job, though he tried to work on an assembly line.