| 摘要 |
<p>PURPOSE:To prevent the effect of background temperature by providing a histogram arithmetic section converting the area of a detection temperature into graphic display of a picture element number corresponding to the detected temperature with respect to the section being the division of the said area from an output of a differential arithmetic unit and providing the setting range between the temperature and the picture element number being the drive condition of an alarm device on a histogram. CONSTITUTION:The histogram arithmetic section 10 converting the output of the differential arithmetic unit 6 into a graphic display of the picture element number corresponding to the same detected temperature with respect to the section being the division of the area of the detected temperature is provided and the setting range of the temperature and picture element number being the drive condition of an alarm device 9 is provided on a histogram. Thus, the alarm discrimination range is set from both factors being the temperature range to be detected from an object to be monitored and the picture element number corresponding to the same temperature and outputted corresponding to the size of the monitor object. That is, the size is set from the detection level corresponding to the monitor object by a picture element number range in advance and the temperature is set in the temperature range held always by the monitor object so as to raise an alarm with high reliability regardless of the change in the background temperature.</p> |
