Hitachi, Ltd.

Shun'ichi Kaneko

Masaya Itoh

Masanori Miyoshi

Hiromasa Fujii

Masato Kazui

Hidenori Takauji

This is a video image monitoring system which can effectively detect a mobile object appearing in a captured video image even if a background image and other camera condition change continuously. The video image monitoring system comprises: a video-image-capturing sectionfor putting out image data based on a video image signal obtained by using a camera; a mobile-object-candidate-area-detecting sectionfor extracting a candidate area of a mobile object from the image data; and a mobile-object-detecting sectionfor determining whether the candidate area is the mobile object. The mobile-object-candidate-area-detecting sectionquantizes a brightness gradient direction of the image data, and calculates a spatio-temporal histogram which represents the frequency of a direction code appearing in a predetermined spatio-temporal space. After that, the mobile-object-candidate-area-detecting sectioncalculates a statistical spatio-temporal space evaluation value of the spatio-temporal histogram. The mobile-object-detecting sectionuses the spatio-temporal space richness to determine whether the candidate area is the mobile object.

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Sapporo, Japan

Shun'ichi Kaneko