Video decoding device

Video decoding device

  • CN 104,202,608 B
  • Filed: 01/18/2013
  • Issued: 02/21/2020
  • Est. Priority Date: 01/18/2012
  • Status: Active Grant
First Claim
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1. A video decoding apparatus for selectively performing scaling on motion vectors of temporal reference blocks, comprising:

  • a prediction block generation unit generating a prediction block by performing inter prediction on the current block,wherein the prediction block generation unit determines whether to perform scaling on a motion vector of the temporal reference block based on Picture Order Count (POC) values of a reference picture referred to by the current block and a temporal reference block used for inter prediction of the current block, and when it is determined to perform scaling of the motion vector of the temporal reference block, calculates a first value and a second value based on a POC difference between pictures, calculates an offset value by performing arithmetic right shift of 1 binary digit on a two complementary integer representation of an absolute value of the first value, calculates an inverse value of the first value using the offset value, and calculates a scaling factor based on the inverse value of the first value and the second value, thereby scaling the motion vector of the temporal reference block, wherein the first value is a POC difference between a collocated picture including the temporal reference block and the reference picture referred to by the temporal reference block, the second value is a POC difference between a current picture including the current block and a reference picture to which the current block refers,wherein the collocated picture is different from the current picture,where the POC indicates the order in which the output is displayed,wherein the prediction block generation unit determines to scale the motion vector of the temporal reference block only if a POC difference between the current picture and a reference picture referred to by the current block is different from a POC difference between the collocated picture and a reference picture referred to by the temporal reference block,wherein the temporal reference block is obtained by determining one of a first block and a second block, both of which are included in the collocated picture,wherein a position of a collocated block in the collocated picture corresponds to a position of a current block in a current picture,wherein the position of the first block is determined based on the lower right corner position of the collocated block,wherein the position of the second block corresponds to the position of a block located in the lower right portion of the juxtaposed block with respect to the center of the juxtaposed block among the four square blocks in the juxtaposed block,wherein both the first value and the second value are adjusted to be included in a first range between-128 and 127, andwherein the scaling factor is adjusted to be included in a second range between-4096 and 4095.

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