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Video encoding/ decoding method and apparatusVideo encoding/ decoding method and apparatus description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090262823, Video encoding/ decoding method and apparatus. Brief Patent Description - Full Patent Description - Patent Application Claims
This is a divisional of and claims the benefit of priority under 35 U.S.C. §120 from U.S. application Ser. No. 12/323,930, filed on Nov. 26, 2008, which is a divisional U.S. application Ser. No. 11/687,923, filed on Mar. 19, 2007, which is a divisional of U.S. application Ser. No. 10/754,535, filed on Jan. 12, 2004, which is a continuation of International Application No. PCT/JP03/04992, filed Apr. 18, 2003, which was not published under PCT Article 21(2) in English. This application is based upon and claims the benefit of priority from the prior Japanese Patent Applications No. 2002-116718, filed Apr. 18, 2002; and No. 2002-340042, filed Nov. 22, 2002, the entire contents of both of which are incorporated herein by reference. 1. Field of the Invention The present invention relates to a video encoding/decoding method and apparatus which encode/decode a fade video and dissolving video, in particular, at high efficiency. 2. Description of the Related Art Motion compensation predictive inter-frame encoding is used as one of encoding modes in a video encoding standard scheme such as ITU-TH.261, H.263, ISO/IEC MPEG-2, or MPEG-4. As a predictive model in motion compensation predictive inter-frame encoding, a model that exhibits the highest predictive efficiency when no change in brightness occurs in the time direction is used. In the case of a fade video which changes in the brightness of pictures, there is no method known up to now which makes a proper prediction against a change in the brightness of pictures when, for example, a normal picture fades in from a black picture. In order to maintain picture quality in a fade video as well, therefore, a large number of bits are required. In order to solve this problem, for example, in Japanese Patent No. 3166716, “Fade Countermeasure Video Encoder and Encoding Method”, a fade video part is detected to change the allocation of the number of bits. More specifically, in the case of a fadeout video, a large number of bits are allocated to the start part of fadeout that changes in luminance. In general, the last part of fadeout becomes a monochrome picture, and hence can be easily encoded. For this reason, the number of bits allocated to this part is reduced. This makes it possible to improve the overall picture quality without excessively increasing the total number of bits. In Japanese Patent No. 2938412, “Video Luminance Change Compensation Method, Video Encoding Apparatus, Video Decoding Apparatus, Recording Medium on Which Video Encoding or Decoding Program Is Recorded, and Recording Medium on Which Encoded Data of Video Is Recorded”, there is proposed an encoding scheme of properly coping with a fade video by compensating for a reference picture in accordance with two parameters, i.e., a luminance change amount and contrast change amount. In Thomas Wiegand and Berand Girod, “Multi-frame motion-compensated prediction for video transmission”, Kluwer Academic Publishers 2001, an encoding scheme based on a plurality of frame buffers is proposed. In this scheme, an attempt has been made to improve the predictive efficiency by selectively generating a prediction picture from a plurality of reference frames held in the frame buffers. According to the conventional techniques, in order to encode a fade video or dissolving video while maintaining high picture quality, a large number of bits are required. Therefore, an improvement in encoding efficiency cannot be expected. It is an object of the present invention to provide a video encoding/decoding method and apparatus which can encode a video which changes in luminance over time, e.g., a fade video or dissolving video, in particular, at high efficiency. According to a first aspect of the present invention, there is provided a video encoding method of subjecting an input videos signal to motion compensation predictive encoding by using a reference picture signal representing at least one reference picture and a motion vector between the input video signal and the reference picture signal, comprising: selecting one combination, for each block of the input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture; generating a prediction picture signal in accordance with the reference picture number and predictive parameter of the selected combination; generating a predictive error signal representing an error between the input video signal and the prediction picture signal; and encoding the predictive error signal, information of the motion vector, and index information indicating the selected combination. According to a second aspect of the present invention, there is provided a video decoding method comprising: decoding encoded data including a predictive error signal representing an error in a prediction picture signal with respect to a video signal, motion vector information, and index information indicating a combination of at least one reference picture number and a predictive parameter; generating a prediction picture signal in accordance with the reference picture number and predictive parameter of the combination indicated by the decoded index information; and generating a reproduction video signal by using the predictive error signal and the prediction picture signal. Continue reading about Video encoding/ decoding method and apparatus... Full patent description for Video encoding/ decoding method and apparatus Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Video encoding/ decoding method and apparatus patent application. Patent Applications in related categories: 20090285301 - Image processing apparatus and image processing method - An image processing apparatus includes: a local motion vector detection section; a global motion calculation section; a global motion vector calculation section; and an evaluation section. ... 20090285300 - Method and apparatus for encoding and decoding an image using a reference picture - A method and apparatus for encoding and decoding an image by performing motion prediction and compensation on pictures in a group of pictures by selectively using a high-quality key picture that is previously encoded and restored, and a second picture that is previously encoded and restored. The method of encoding ... 20090285299 - Method and apparatus for encoding enhancement layer video data - A method for improving the performance of the BLSkip mode in SVC includes the steps of upsampling the motion field of the base layer, interpolating the motion vectors for the intra MBs, interpolating the 8×8 block motion field to a 4×4 block motion field, and generating a MV predictor for ... 20090285303 - Motion estimation for video processing using 2-d (spatial) convolution - A device including a two-dimensional convolution unit to perform spatial image filtering. A reference frame mirroring unit is connected to the two-dimensional convolution unit. A mean square error (MSE) decision unit is connected to the two-dimensional convolution unit to perform motion estimation by selecting the displacement that minimizes MSE. ... 20090285302 - Moving picture encoding apparatus and method, moving picture decoding apparatus and method - A prediction mode is selected in accordance with a type of a moving picture. When an interframe prediction mode is selected as the prediction mode, a motion vector for the moving picture is detected. Motion compensation for the moving picture is performed based on the type of the moving picture, ... 20090285305 - Video encoding/ decoding method and apparatus - A video encoding method comprises selecting one combination, for each block of an input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture, generating a prediction picture signal in accordance with the reference ... 20090285304 - Video encoding/ decoding method and apparatus - A video encoding method comprises selecting one combination, for each block of an input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture, generating a prediction picture signal in accordance with the reference ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. 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