Method and apparatus for collating object

• US 7,710,431 B2
• Filed: 11/26/2007
• Issued: 05/04/2010
• Est. Priority Date: 11/20/2000
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ishiyama, Rui
• Primary Examiner(s): Nguyen; Hau H
• Application Number:
  US11/944,965
• Publication Number:
  US 20080080763A1
• Time in Patent Office: 890 Days
• Field of Search: 345/423, 345/426, 345/607, 345/552, 345/582, 382/118, 382/219
• US Class Current: 345/582
• CPC Class Codes: G06V 10/60 relating to illumination properties, e.g. using a reflectance or lighting model
• CPC Class Codes: G06V 10/758 Involving statistics of pixels or of feature values, e.g. histogram matching
• CPC Class Codes: G06V 40/168 Feature extraction; Face representation
• CPC Class Codes: G06V 40/171 Local features and components; Facial parts eye characteristics G06V40/18; Occluding parts, e.g. glasses; Geometrical relationships
• CPC Class Codes: G06V 40/172 Classification, e.g. identification

Abstract

An object collation method comprising a registration procedure for registering the registered data of a registered object in a database, and a collation procedure for collating the input image of a target object with the registered data. The registration procedure includes a step of storing the three-dimensional shape of the registered object and a texture space defined by a texture group indicating the luminance and/or color information of each position of the object surface under various illumination conditions. The collation procedure includes the steps of: generating an illumination fluctuation space defined by the image group under the various illumination conditions, at the location and position of the target object in the input image from the three-dimensional shape and the texture space; and collating the target object and the registered object based on the distance between the illumination fluctuation space and the input image.

Claims

1. An image synthesis method comprising:

a synthesis procedure for synthesizing an image of an object in a pose at a location under an illumination condition using appearance data of said object;

said appearance data comprising;

a three-dimensional shape of said object; and

a texture space, which is an image space, defined by a texture group indicating luminance and/or color information of each position of a surface of said object under various illumination conditions;

said synthesis procedure comprising the steps of;

generating an illumination fluctuation space, which is an image space, defined by an image group under various illumination conditions in said pose at said location from said three-dimensional shape and said texture space, said generating using coordinate transformation of the texture space; and

collating an image from said illumination fluctuation space by linear combination of a plurality of textures.

3. The method according to claim 1, wherein the texture space is generated by analyzing said texture group statistically to determine a basic texture group of basic vectors of a space covering most of fluctuation factors appearing on the texture in accordance with the illumination conditions.

2. An image synthesis method comprising:

a synthesis procedure for synthesizing an image of an object in a pose at a location under an illumination condition using appearance data of said object;

said appearance data comprising;

a three-dimensional shape of said object; and

a texture space, which is an image space defined by a set of texture bases, indicating luminance and/or color information of each position of a surface of said object under various illumination conditions;

said synthesis procedure comprising the steps of;

projecting each said texture bases into a set of image bases in said pose at said location by using said three-dimensional shape; and

collating an image as an image in an illumination fluctuation space, which is an image space defined by said set of image bases by linear combination of the texture bases.