source: 3DVCSoftware/branches/HTM-4.1-dbg0/README-changes.txt

Last change on this file was 2, checked in by hhi, 13 years ago

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1Changes from JCTVC-A124
2Contact: Woo-Jin Han, wjhan.han@samsung.com
3
41. Removed tools
5
6  1.1 MVAC (motion vector accuracy control)
7      - Enables to limit the motion accuracy up to 1/2 accuracy in B-slices for complexity reductio
8                        - Not used in CfP submission
9      - Command line option in A124: MVA
10  1.2 SHV (simultaneous H & V motion partition)
11      - Enables to use motion partition composed of quarter and remaining regions
12      - Not used in CfP submission
13      - Command line option in A124: SHV
14  1.3 RNG (random noise generation)
15      - Insert Gaussian noise into the reconstruction file to improve perceived quality in flat areas
16      - Not used in CfP submission
17      - Command line option in A124: RNG
18  1.4 LOT (logical transform)
19      - Perform 5-3 wavelet + DCT if physical transform size is smaller than requested transform size
20      - Used in CfP submission only for 128x128 block
21      - Command line option in A124: LOT
22  1.5 CADR (contents-adaptive dynamic range)
23      - Performance source scaling within bit-depth limit
24      - Used in CfP submission
25      - Command line option in A124: CAD
26  1.6 LCT (low-complexity transform)
27      - Low-complexity version of large integer transform
28      - Not used in CfP submission
29      - Command line option in A124: LCT
30  1.7 EXC (extreme correction) & BDC (band correction)
31      - In-loop post filters based on pixel statistics
32      - Used in CfP submission
33      - Command line option in A124: EXC
34  1.8 PTM (pattern matching intra)
35      - Pixel-based pattern matching technique for intra prediction
36      - Used in CfP submission
37      - Command line option in A124: TMI
38  1.9 MPI (multi-parametric intra)
39      - Multi-parametric post-processing of intra prediction
40      - Used in CfP submission
41      - Command line option in A124: MPI
42  1.A CCCP (color correlation based chroma prediction)
43      - Chroma intra prediction based on luma reconstruction
44      - Used in CfP submission
45      - Command line option in A124: CCP
46  1.B ACS (adaptive coefficient scanning)
47      - 3 scanning patterns are used selectively (zigzag, horiz, vert)
48      - Used in CfP submission
49      - Command line option in A124: ACS
50  1.C HAM (high accuracy motion)
51      - 1/12th accuracy motion vector for luma and chroma
52      - Used in CfP submission for both luma and chroma
53      - Command line option in A124: HME, HAP, HAB
54  1.D HME: high accuracy motion estimation
55      - HAP: HAM in P-slice
56      - HAB: HAM in B-slice
57
582. Modified tools
59
60  2.1 DIF (DCT-based interpolation filter)
61      - A124 uses 6-tap DIF for chroma
62      - Replaced with AVC bi-linear (1/8th) since it uses HAM filters (1/12th), which are not included in TMuC.
63  2.2 GRF (generated reference frame)
64      - Weighted, weight + offset, offset, affine, isotropic and perspective are supported
65      - Not used in CfP submission
66      - Command line option in A124: -v <character>
67      - w: weighted, o: offset, r: refinement, a: affine, i: isotropic, p: perspective
68      - Affine, isotropic and perspective are removed but weighted prediction is remained due to simulate AVC WP
69      - To activate: ¡®-v w¡¯ in command line (scale+offset) or ¡®-v o¡¯ for offset-only
70  2.3 AMVP (advanced motion prediction)
71      - A124 software supports three AMVP modes
72      - AM_NONE : use first candidate only (similar to AVC), no signaling
73      - AM_EXPL : use explicit signaling (used in CfP submission)
74      - AM_IMPL : use implicit signaling based on template matching
75      - TMuC only has both explicit signaling mode and non-AMVP method
76      - AM_IMPL is removed since it is not included in TMuC
77      - AM_NONE is maintained since it can be a place-holder for non-AMVP method
78  2.4 CIP (combined intra prediction)
79      - CIPflag is now coded only for intra blocks (bug-fix)
80      - A124 codes CIPflag even in inter blocks
81
823. Option changes
83
84  3.1 JMQ (JM QP)
85      - JMQ = 1: use JM QP assignments, JMQ = 0: use JSVM QP assignments
86      - Option is removed and JMQ is always on
87      - Option fix: JML (JM Lambda)
88  3.2 JML = 1: use JM lambda strategy, JML = 0: use JSVM lambda strategy
89      - Option is removed and JML is always on
90  3.3 Option fix: ADI
91      - Option is removed and ADI is always turned on
92  3.4 Option fix: AMV (AMVP)
93      - Option is removed and AMVP is always turned on
94  3.5 Option fix: DIF
95      - Option is removed and DIF is always turned on
96  3.6 Option fix: AMP
97      - Option is removed and AMP is always turned on
98  3.7 Option fix: CIP
99      - Option is removed and CIP is always turned on
100  3.8 Option fix: ROT
101      - Option is removed and ROT is always turned on
102      - Note: set ROT_DICT = 1 to disable ROT
103  3.9 Option fix: ACC
104      - Try coefficient clearing in inter modes
105      - Option is removed and ACC is always turned on
106  3.A Profile option (-p)
107      - It was used to separate A124 and A125 coding tools
108      - Removed, now
109
1104. Misc. changes
111
112  4.1 MAX value of IBDI is fixed (IBDI_NOCLIP_RANGE MACRO)
113      - Only allows possible values of bit-depth increased signal, not all possible values of inherent high bit-depth case
114  4.2 Encoder output is fixed
115      - Slice size bit (32) is now added to the encoder print-out
116        4.3 Source code improvements
117            - Unused functions are removed
118                        - Variable & function namings are changed to clarify its purpose
119       
1205. Known problems
121
122  5.1 POC coding
123            - It's not implemented well. Currently, fixed 10-bit is used for POC coding.
124        5.2 ROT (rotational transform)
125            - Inverse ROT code is not the best one on the aspects of the dynamic range although we already have better one.
126                        - It'll be replaced later with much simpler implementation.
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