IN-SPACE ABNORMALITY DETECTOR AND IN-SPACE ABNORMALITY DETECTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an in-space abnormality detecting method and an in-space abnormality detector with higher detection precision by eliminating disturbance such as waves on the water. ;SOLUTION: A photographic area is divined into approximately 60 sections and a featured value (a integrated value or average value of image data) is calculated by every section from image data to be obtained. Then secular change for every section is calculated from extremely small number of pieces of section group information and whether the section is an active area or a still area is decided. On the other hand, a reference value (for example, an average value of luminance signals or color difference signals in the entire image pickup area) about image data in the entire or a part of image pickup area is periodically or aperiodically calculated. And a threshold is set based on the reference value (for example, 5% of the average value of luminance signals in the entire image pickup area is set as the threshold) and whether the section is in a still state or in an active state is decided. When fixed time elapses from a state that the number of sections decided to be in an active state is equal to or less than the prescribed value, the state is decided as an abnormal state.;COPYRIGHT: (C)2001,JPO