Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
February 11, 2014
Patent Application Number
12920166
Date Filed
March 2, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
A control device divides one frame into plural sub-frames, distributes image signals of an embedded image, which is provided to only specific users, to the plural sub-frames such that a sum of signal levels in the one frame is zero, and superimposes the image signals on an image signal of a basic image provided to unspecified people and causes a display device to display the embedded image. The reception device shoots an image displayed on the display device in each period that is the same as the period of the sub-frame and calculates the difference between two image signals obtained in each period that is the same as the period of the sub-frame to acquire and display an image signal of the embedded image.
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