JPS57163808A - Shape detector - Google Patents

Abstract

PURPOSE:To improve the reliability of shape detection by sending a fault signal by automatically diagnosing a stray run and a runaway in the middle of external circumference track processing after processing a data group, stored in a storage device temporarily, by local histogram arithmetic and spatial differential arithmetic. CONSTITUTION:On the basis of processing results obtained by a histogram arithmetic device 7 and a spatial differential arithmetic device 8, an external circumference track arithmetic device 9 track the external circumference shape of the front end part of a steel plate 1 to diagnose a scale, over-heated parts, etc., by self-diagnostic function 10. At a ''valley'' position of a local histogram calculated by the device 7, all data in a storage device 6 are coded into binary data. A binary-coded level found in an area, where temperature is highest and distribution is stable, in the front end part of the steel plate 1 is regarded as a minimum area for tracking, and a minimum temperature level is regarded as a maximum area for tracking. When it is judged that the device 10 has transition from a tracking area between their difference to an abnormal area, a fault signal transmitter 11 outputs a warning signal.