PURPOSE:To prevent injurious or fatal accident due to careless operation of a machine by monitoring the moving locus of workers to determine whether or not they enter a dangerous area. CONSTITUTION:A TV camera 4 is provided to photograph the inside of a factory. An image signal of the TV camera 4 is processed to store the moving track of a worker M or the like into a memory 12U and based on the output thereof 12, the moving locus of the worker M or the like is indicated on a pickup device 20. This enables clear determination by view on whether the worker M or the like enters a dangerous area. Thus, injurious or fatal accidents due to careless operation of a machine can be prevented thereby improving the safety thereof.
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