Radiant energy – Infrared-to-visible imaging
Patent
1990-05-31
1991-10-22
Hannaher, Constantine
Radiant energy
Infrared-to-visible imaging
250332, 250334, 250342, 382 1, 382 25, 340565, G06K 900, G01J 518
Patent
active
050597965
ABSTRACT:
An infrared monitoring system includes a histogram calculation circuit which detects an alarm area having a plurality of pixels more than a threshold number of pixels and having a temperature higher than a threshold temperature and which generates a first alarm signal when detecting the alarm area. The infrared monitoring system also includes a shape recognition circuit which determines whether or not a shape of the temperature change area corresponds to a predetermined shape and which generates a second alarm signal when determining that the shape of the temperature change area corresponds to the predetermined shape. An alarm device included in the infrared monitoring system generates an alarm such as a siren when both the first and second alarm signals are generated. In place of or in addition to the shape recognition circuit, a temperature profile circuit is used which determines whether or not a relative position of a pixel having a highest temperature contained in the temperature change area to a vertical width of the temperature change area is in a predetermined range and which generates an alarm signal when determining that the relative position of the pixel is in the predetermined range. The alarm device generates the alarm when the alarm signal from the histogram calculation circuit and at least one of the alarm signals from the shape recognition circuit and the temperature profile calculation circuits are generated.
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Frei et al., "Digital Image Change Detection", Optical Engineering, vol. 19, No. 3, Jun. 1980, pp. 331-338.
Fujitsu Limited
Glick Edward J.
Hannaher Constantine
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