Motion detecting device and search region variable-shaped motion detector

• US 8,019,168 B2
• Filed: 02/08/2007
• Issued: 09/13/2011
• Est. Priority Date: 01/10/2003
• Status: Expired due to Fees

• Current Assignee: NEC Electronics Corporation (Renesas Electronics Corporation)
• Original Assignee: Renesas Electronics Corporation
• Inventors: Hanami, Atsuo
• Primary Examiner(s): Do; Anh Hong
• Application Number:
  US11/672,822
• Publication Number:
  US 20070127830A1
• Time in Patent Office: 1,678 Days
• Field of Search: 382/236, 382/190, 382/239, 382/173, 382/238, 386/356, 348/E5.066, 348/699, 375/E7.122, 375/E7.111, 375/240.16
• US Class Current: 382/236
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 2207/30232 Surveillance
• CPC Class Codes: G06T 7/223 using block-matching
• CPC Class Codes: H04N 19/543 using regions
• CPC Class Codes: H04N 19/57 Motion estimation characterised by a search window with variable size or shape
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 5/145 Movement estimation for video coding H04N19/51
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

An overall motion detecting device (1) includes a search region variable-shaped motion detector (2) and an overall motion information generator (3). The overall motion information generator (3) controls a surveillance camera (5) which is an external image capturing system and supplies control information of the surveillance camera (5) (such as moving direction, angular speed and focal length) to the search region variable-shaped motion detector (2) as overall motion information (S3). The search region variable-shaped motion detector (2) calculates a motion vector (mv) while renewing, by picture, a search region having a search shape determined by the overall motion information (S3) and a region area suitable for its operational capability.

Claims

1. A motion detecting device for generating a motion vector in image data to be encoded, comprising:

an overall motion information generator configured to generate overall motion information indicative of overall motion of an image specified by said image data; and

a search region variable-shaped motion detector configured to determine a search shape as a determined search shape based on said overall motion information and to set a search region having an area determined by said determined search shape and operational capability of said search region variable-shaped motion detector, and to perform a comparison operation in said search region between current image data and reference image data in said image data, thereby generating a motion vector, wherein

said reference image data is extracted from external storage through a DRAM interface, and

said determined search shape varies at a predetermined timing as said overall motion information varies.