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Method of image feature coding and method of image search
| Details |
Inventors: Sekiguchi, Shunichi; Yamada, Yoshihisa; Chow, James; Asai, Kohtaro;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Couso; Jose L.
Assistant Examiner:
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch, LLP
A feature coding unit extracts and encodes a feature of a video signal so as to generate a feature stream. A feature identifying unit checks a decoded feature obtained as a result of decoding the feature stream against a search key from a user for a match so that a video content requested by the user is retrieved. |
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DETAILED DESCRIPTION Accordingly, a general object of the present invention is to provide a method of image feature coding and a method of image search in which the aforementioned drawbacks are eliminated.
Another and more specific object is to provide a method of image feature coding and a method of image search in which a large number of users can search for images using a variety of search tools.
The aforementioned objects can be achieved by an image feature coding method comprising the steps of: extracting segments of image areas from an image frame; attaching a segment number to each of the extracted segments; assigning a representative color to each of the extracted segments; computing a relative area of each of the segments with respect to the image frame; coding the representative color and the relative area to produce a feature of the image; and generating a feature stream corresponding to the image having the feature encoded therein.
The segments may be extracted from the image frame in accordance with color information, and the color information used in extracting the segments is assigned to the extracted segments as the representative color.
The segments from adjacent image frames may be checked for identity match, and those segments determined to match each other are given a same segment number.
The segments may be tracked from image frame to image frame so as to determine movement information relating to the segments that match each other in identity, the movement information is generated by coding to produce the feature of the segments, and the feature stream, having the feature thus produced encoded therein, is generated.
An appropriate key frame that provides a key for a search is extracted from a group of image frames of a video signal, whereupon the segments are extracted from the extracted key frames.
A reduced image of the key frame may be generated by averaging pixels located in respective areas of the key frame, the reduced image is coded to produce the feature of the key frame, and the feature stream, having the feature thus produced encoded therein, is generated
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Image Analysis 
