US2019289320A1PendingUtilityA1

Method and apparatus of error handling for video coding using intra block copy mode

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Assignee: MEDIATEK INCPriority: Jun 3, 2015Filed: Jun 4, 2019Published: Sep 19, 2019
Est. expiryJun 3, 2035(~8.8 yrs left)· nominal 20-yr term from priority
Inventors:Tzu-Der ChuangChia-Yun ChengHan-Liang ChouChing-Yeh ChenYu-Chen SunYu-Wen Huang
H04N 19/593H04N 19/70H04N 19/563H04N 19/513
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Claims

Abstract

In order to overcome the issue caused by a decoded block vector (BV) pointing to a reference block overlapping with an unavailable area, various methods are disclosed. According to one method, if the reference block overlaps with an unavailable area, the reference pixels in the unavailable area are generated for IntraBC prediction of the current block by padding from neighbouring available pixels. The padding can be done in the horizontal direction and then the vertical direction. The padding may also done in the vertical direction first and then horizontal direction. In another method, if the reference block overlaps with an unavailable area, the reference pixels in the unavailable area are generated for IntraBC prediction of the current block by using previous decoded pixels in the unavailable area. A pre-defined value may also be used for the unavailable area.

Claims

exact text as granted — not AI-modified
1 - 17 : (canceled) 
     
     
         18 : A method of error handling for a video decoding system using an Intra Block Copy (IntraBC) mode, comprising:
 determining a decoded BV (block vector) for a current block in a current picture;   determining a reference block in the current picture, wherein the reference block is pointed by the decoded BV from the current block;   storing a previous decoded block in a storage area, wherein the reference block for IntraBC prediction of the current block is fetched directly from the storage area corresponds to the current picture; and   decoding the current block in the IntraBC mode using the reference block.   
     
     
         19 : The method of  claim 18 , further comprising resetting all samples in the storage area to a pre-defined value before decoding the current picture. 
     
     
         20 : A method of error handling for a video decoding system using an Intra Block Copy (IntraBC) mode, comprising:
 determining a decoded BV (block vector) for a current block in a current picture;   determining a reference block in the current picture, wherein the reference block is pointed by the decoded BV from the current block;   if the reference block overlaps with an unavailable area, generating predictors for all pixels of the current block using the pre-defined value; and   decoding the current block in the IntraBC mode using the predictors for all pixels of the current block.   
     
     
         21 : The method of  claim 20 , wherein the pre-defined value is (1<<(bit_depth−1)). 
     
     
         22 : The method of  claim 20 , wherein the predefined value is signalled in the SPS (sequence parameter set), PPS (picture parameter set), or slice header

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