发明名称 |
Method and apparatus for encoding frequency transformed block using frequency mask table, and method and apparatus for encoding/decoding video using same |
摘要 |
A video encoding/decoding apparatus including a video encoder for generating a prediction block, generating a residual block by subtracting the prediction block from the current block. The video encoder is for generating a frequency-transformed block by transforming and quantizing the residual block, generating a masked frequency-transformed block by masking the frequency-transformed block by using one or more frequency mask tables. The video encoder is for encoding information about a frequency mask table used for masking the masked frequency-transformed block. The apparatus includes a video decoder for extracting a masked quantized frequency coefficient string recorded in the bitstream. The video decoder is for generating a quantized frequency coefficient string by zero setting all quantized frequency coefficients at positions of no records in the bitstream from a masked quantized frequency coefficient string. The video decoder is for generating a quantized frequency-transformed block by inversely scanning the generated quantized frequency coefficient string. |
申请公布号 |
US9497461(B2) |
申请公布日期 |
2016.11.15 |
申请号 |
US201113878352 |
申请日期 |
2011.09.30 |
申请人 |
SK TELECOM CO., LTD. |
发明人 |
Song Jinhan;Lim Jeongyeon;Kim Haekwang;Moon Joohee;Lee Yunglyul;Han Jongki;Jeon Byeungwoo |
分类号 |
H04N19/105;H04N19/463;H04N19/132;H04N19/18;H04N19/126;H04N19/129;H04N19/176 |
主分类号 |
H04N19/105 |
代理机构 |
Hauptman Ham, LLP |
代理人 |
Hauptman Ham, LLP |
主权项 |
1. A video decoding method performed by a video decoding apparatus, the method comprising:
generating a predicted block by predicting a current block to be decoded; extracting a position information from a bitstream including the position information, wherein the position information indicates a position of the last coefficient which has a non-zero value in a scanning order within a transform unit; generating a transform block having a block size of the transform unit by deriving, from the bitstream, coefficients preceding the last coefficient in the scanning order based on the position information; generating a residual block by inversely quantizing and then inversely transforming the transform block; and reconstructing the current block by adding the predicted block to the residual block, wherein the generation of the transform block comprises: setting coefficients following the last coefficient in the scanning order to 0, without extracting, from the bitstream, a value indicating whether or not a coefficient following the last coefficient in the scanning order is equal to 0; extracting, from the bitstream, a value indicating whether or not a coefficient preceding the last coefficient in the scanning order is equal to 0; when the extracted value is a first value, reconstructing the preceding coefficient corresponding to the extracted value from the bitstream; and when the extracted value is a second value, setting the preceding coefficient corresponding to the extracted value to 0. |
地址 |
Seoul KR |