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Method of retrieving video picture and apparatus thereforRelated Patent Categories: Pulse Or Digital Communications, Bandwidth Reduction Or Expansion, Television Or Motion Video Signal, Predictive, Motion VectorMethod of retrieving video picture and apparatus therefor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060109908, Method of retrieving video picture and apparatus therefor. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a retrieval technique for video data and, more particularly, to a method of retrieving a video picture and apparatus therefor, which use the function of coding a video picture in units of arbitrary shape objects and are implemented by MPEG4 as an internal standard scheme for video coding in the process of standardization in ISO/IECJTC/SC29/WG11. [0002] According to MPEG4 in the process of standardization, the function of coding a video picture in units of arbitrary shape objects (e.g., a human figure in a picture), which cannot be implemented by MPEG1 or MPEG2 that is a conventional international standard scheme for video coding, can be implemented. [0003] To implement this function, information representing the shape or size of each object is required. This information is coded together with texture information representing changes in luminance and chrominance inside each object, and the resultant data is transmitted or stored. [0004] In a conventional video picture retrieving technique, a change in luminance in a frame (e.g., edge information), change in luminance between frames (e.g., optical flow), or the like is detected, and video sequences are classified by checking changes in these pieces of information. An index for retrieval is assigned to each classified group. [0005] When these processes are performed by a decoder apparatus, a complicated signal processing unit is often required after a reconstructed picture is generated. For this reason, techniques of reducing the processing amount by analyzing a video picture on the basis of motion vector information obtained in the process of generating a reconstructed picture or DCT (Discrete Cosine Transform) coefficient information have also been proposed (for example, Jpn. Pat. Appln. KOKAI Publication Nos. 6-113280 and 7-152779 and Japanese Patent Application No. 8-178778). [0006] In any case, there is a limit to the technique of analyzing video pictures in units of frames and retrieving a video picture with high precision. [0007] When a video picture is to be retrieved from conventional coded video data (MPEG1 or MPEG2)., since retrieval processing is performed in units of frames as minimum units, it is difficult to perform video picture retrieval with high precision. [0008] In contrast to this, according to MPEG4, retrieval processing can be performed in units of objects in each frame as minimum units. BRIEF SUMMARY OF THE INVENTION [0009] It is an object of the present invention to provide a method of retrieving a video picture and apparatus therefor, which are designed to process a video picture using MPEG4 as a video coding scheme, detect the size, shape, and motion of each object and its position in a picture by using the shape information of each object of a coded bit stream based on MPEG4, and can perform high-precision video picture retrieval by using these information without using any complicated signal processing unit. [0010] According to the present invention, there is provided a method of retrieving a video picture, comprising decoding a coded bit stream of video data representing an arbitrary shape object and including shape information and texture information, and supplying a retrieval condition for retrieval of a desired picture and retrieving a picture meeting the retrieval condition by using shape information of the object decoded by the above decoding. [0011] According to the present invention, there is provided an apparatus for retrieving a video picture, comprising a decoder section which decodes a coded bit stream of video picture data representing an arbitrary shape object and including shape information and texture information, a retrieval condition input section which inputs a retrieval condition for retrieval of a desired picture, and a retrieval section which retrieves a picture meeting the retrieval condition by using shape information of the object decoded by the decoder section. [0012] According to the present invention, there is provided a method of retrieving a video picture, comprising decoding a coded bit stream of an arbitrary shape object including shape information and texture information and corresponding to video data coded by MPEG4 when retrieving a desired picture from the video data coded by MPEG4, retrieving a video picture meeting a supplied retrieval condition for retrieval of a desired video picture by using shape information of a decoded object, and presenting a retrieved result. [0013] According to the present invention, there is provided a video picture retrieving apparatus for retrieving a desired picture from video data coded by MPEG4, comprising a decoder section for decoding a coded bit stream of an arbitrary shape object which includes shape information and texture information and corresponds to video data coded by MPEG4, a retrieval condition input section which inputs a retrieval condition for retrieval of a desired picture, a retrieval section which retrieves a video picture meeting a retrieval condition by using the shape information of the object decoded by the decoder section, and an output section which presents a retrieved result obtained by the retrieval section. [0014] According to the present invention, there is provided a method of retrieving a video picture and apparatus therefor, which can perform sophisticated video picture retrieval in consideration of the contents of a picture by using shape information (size, shape, motion, and position in a picture) of each object without using any complicated signal processing section. [0015] Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING [0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate presently preferred embodiments of the invention, and together with the general description given above and the detailed description of the preferred embodiments given below, serve to explain the principles of the invention. [0017] FIG. 1 is a view for explaining a coding area including an object; [0018] FIGS. 2A to 2C are views for explaining the arrangement of coded shape data in detail; [0019] FIG. 3 is a view for explaining the attribute of each macroblock; [0020] FIG. 4 is a block diagram for explaining an outline of an MPEG4 system; [0021] FIG. 5 is a block diagram showing the schematic arrangement of a video picture retrieving apparatus according to an embodiment of the present invention; Continue reading about Method of retrieving video picture and apparatus therefor... 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