Compare LC and HE configure for HM3.0 of HEVC(H.265)

HEVC(H.265)的Low Complexity(LE)和High Efficiency(HE)配置主要区别是：

1. 熵编码不同，LC采用LCEC，HE采用CABAC

2. LC不支持自适应环内滤波(ALF)

3.LC不支持内部位深度扩展(IBDI)

相对于HM1.0，在HM3.0中对LC和HE的配置做了修改，主要区别在于统一了子像素插值滤波器。

亮度插值采用统一的8阶插值滤波器，HM1.0采用的分别是6阶和12阶插值滤波器。

新的系数：

Position	Filter coefficients
1/4	{ -1, 4, -10, 57, 19, -7, 3, -1 }
2/4	{ -1, 4, -11, 40, 40, -11, 4, -1 }
3/4	{ -1, 3, -7, 19, 57, -10, 4, -1 }

色度插值采用统一的4阶插值滤波器，HM1.0采用的是双线性插值滤波器，

新的系数：

Position	Filter coefficients
1/8	{ -3, 60, 8, -1 }
2/8	{ -4, 54, 16, -2 }
3/8	{ -5, 46, 27, -4 }
4/8	{ -4, 36, 36, -4 }
5/8	{ -4, 27, 46, -5 }
6/8	{ -2, 16, 54, -4 }
7/8	{ -1, 8, 60, -3 }

LC和HE的配置如下表：

High Efficiency Configuration	Low Complexity Configuration
Coding Unit tree structure (8x8 up to 64x64 luma samples)
Prediction Units
Transform unit tree structure (3 level max.)
Transform block size of 4x4 to 32x32 samples Mode-dependent Transform for 4x4 block
Spatial Intra Prediction (34 angular directions and Planar) Adaptive Intra Smoothing Intra Chroma Prediction using Luma samples
DCT-based interpolation filter for luma samples (1/4-sample, 8-tap)
DCT-based interpolation filter for luma samples (1/8-sample, 4-tap)
Coding Unit based Skip & Prediction Unit based merging
Advanced motion vector prediction
Context adaptive binary arithmetic entropy coding	Context adaptive VLC
Internal bit-depth increase (2 bits)	X
Deblocking filter Sample Adaptive Offset
Adaptive loop filter	X