The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/sc 29/wg 11 held its second meeting during 21-28 July, 2010 at the itu-t premises in Geneva, ch

JCTVC-B086 [S. Oh, S. Yea (LG)] TE2: Memory access bandwidth for inter prediction in HEVC

In this contribution an experimental result on memory bandwidth for HEVC is provided. With increasing popularity of high-definition or higher resolution materials for all types of video devices, consideration for memory access bandwidth issues is becoming ever more important. In this contribution, the number of pixels to be accessed from the frame buffer is used as a measure to estimate memory bandwidth of the decoder. It is observed that, under TE2 coding conditions using the class B sequence, the use of extended MB tool in KTA2.6r1 leads not only to the coding gain but also the reduction of memory bandwidth.

Analysis shows that overhead in memory access (e.g. due to additional pixels required for interpolation) is by tendency getting lower for larger blocks.

It was remarked that we should better understand whether this is still true when caching is used.

The contribution shows that memory accesses are saved when a larger portion of large MB’s is used. It does not answer the question what losses occur and how many memory accesses are saved if small blocks would be restricted.