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 tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

4.1.2Contributions

JCTVC-J0030 CE1: Cross-verification of Intra transform mode dependency simplifications (JCTVC-J0021) [R. Cohen (MERL)]
JCTVC-J0034 CE1: Cross-check of Intra transform mode dependency simplifications [A. Saxena, E. Alshina, F. Fernandes (Samsung)]
JCTVC-J0035 CE1: Nokia’s results on intra transform mode dependency simplifications [K. Ugur, O. Bici (Nokia)]

This contribution presents the CE1 results by Nokia on intra transform mode dependency simplifications. In this core experiment, two simplifications were tested. Simplification 1 uses 2D DST for all intra prediction modes of 4x4 luma TU’s. Simplification 2 uses 2D DST for all intra prediction modes of 4x4 luma TU’s except the DC mode is coded with 2D DCT. Both simplifications show coding efficiency loss ranging between 0.0%–0.1%.

BR increase is 0.5% in class F (0.8% for low QP) for simplification 1, 0.3% for simplification 2.

JCTVC-J0276 CE1: Crosscheck of Nokia’s results on intra transform mode dependency simplifications (JCTVC-J0035) for low QPs [R. Joshi (Qualcomm)]
JCTVC-J0129 CE1: Cross-check of mode-dependent transform simplifications [C. Yeo, Y. H. Tan (I2R)]

An additional variant is tested where DST is used for all 4x4 TUs for both luma and chroma and for both inter and intra. This was not tested visually, and was not advocated for adoption. It was remarked that the 4x4 transform is a subset of the larger transforms anyway.

JCTVC-J0388 Cross-check of simplification 3 of JCTVC-J0129 [K. Ugur (Nokia)] [late]
JCTVC-J0243 CE1: Cross-check of intra transform mode dependency simplifications [J. Xu (Microsoft)]