| 摘要 |
PURPOSE:To reduce a change in detection capacity due to a partial illuminating light quantity in a monitoring area by extracting only a he from a color picture signal obtained by a color picture image pickup means, and inputting it to an image processing means. CONSTITUTION:The hue is found by inputting three chrominance signal outputs from a color picture image pickup means 11 consisting of a color television camera, and is inputted to an abnormality monitoring device main body 5. On a picture memory 21, a hue image in a present monitoring area fetched in every moment from a picture input means 1 is stored, and it is subtracted from a luminance data on a reference picture element memory 22 at a difference absolute value circuit 23, then being made into an absolute value, and is binary-coded at a binarization circuit 24 with an appropriate threshold value, and an image consisting only of a picture element in which a luminance change between a present image and a reference image more than a prescribed threshold value is present can be obtained. And when an abnormality is detected at an abnormality decision means 3, the detection of the abnormality is outputted from an output means 4. In this way, even when nonuniformity in the illuminating light quantity within the monitoring area is present, a stable detection capacity can be obtained over the whole picture plane.
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