发明名称 |
Variable length coding/decoding method for motion vectors |
摘要 |
In connection with compression-coding of video signals on the basis of inter-frame correlation, a single reference table is used for variable length encoding of inter-frame motion vectors established on the basis of various motion vector value ranges and degrees of accuracy. A reference table is provided for variable length encoding motion vectors based on a particular value range and degree of accuracy. In order to use the same table for motion vectors based on a larger value range than that for which the table was designed, the value of a motion vector to be encoded is divided to form a quotient and a remainder. An addition bit code is formed on the basis of the remainder and is appended to a variable length code which corresponds in the reference table to the quotient so that a variable length code value is formed for the motion vector based on the larger range. As to motion vectors based on a finer degree of accuracy than was provided for in the reference table, the motion vector value is multiplied by an appropriate factor and the resulting product is used to obtain a corresponding variable length code value from the reference table. Decoding is performed using the same table and by means of decoding operations that are the inverse of the encoding operations.
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申请公布号 |
US5428396(A) |
申请公布日期 |
1995.06.27 |
申请号 |
US19930173042 |
申请日期 |
1993.12.27 |
申请人 |
SONY CORPORATION |
发明人 |
YAGASAKI, YOICHI;YONEMITSU, JUN;VELTMAN, MARK;IGARASHI, KATSUJI;KATO, MOTOKI |
分类号 |
H04N7/26;H04N7/36;H04N7/50;(IPC1-7):H04N7/32 |
主分类号 |
H04N7/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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