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Image matting evaluation results Competition: Low resolution High resolution
Error type: SAD MSE Gradient Connectivity

Sum of Absolute Differences overall
avg.
small avg.
large avg.
user Troll
(Strongly Transparent)
Input Doll
(Strongly Transparent)
Input Donkey
(Medium Transparent)
Input Elephant
(Medium Transparent)
Input Plant
(Little Transparent)
Input Pineapple
(Little Transparent)
Input Plastic bag
(Highly Transparent)
Input Net
(Highly Transparent)
Input

rank rank rank rank small large user small large user small large user small large user small large user small large user small large user small large user

SIM 2.7 2.9 2 3.3 8.3 1 8.7 1 9 1 4.8 10 4.8 7 6 9 2.2 1 2.2 1 2 1 0.9 5 0.9 2 1.1 1 4.7 2 5.1 1 6.3 2 2.2 1 2.3 1 2.5 1 15.9 1 16.3 1 16.3 5 17.8 2 18 2 20.9 6

PIIAMatting 5.3 3.1 7 5.9 9.1 5 10 7 9.3 3 4.3 2 4.6 2 5.4 3 2.8 4 3.7 11 2.7 4 0.9 2 2.3 16 2 11 4.7 3 6.8 7 8.3 7 2.2 3 2.7 4 4.3 13 17.2 5 17.3 5 15.5 1 16.6 1 19.1 4 20.2 5

IamAlpha 5.3 4.6 4.5 6.9 10.4 13 10.5 9 10.8 11 4.4 3 4.4 1 6.1 10 2.7 2 3 4 3.2 10 0.9 3 1.7 10 1.7 5 4.8 4 5.2 2 6.2 1 2.5 7 3.3 7 3.3 4 16.2 2 16.9 2 17.9 13 17.8 3 18 1 18 1

HDMatt 6.6 8.4 5.1 6.3 9.5 7 10 5 10.7 10 4.7 6 4.8 5 5.8 7 2.9 7 3 3 2.6 2 1.1 10 1.2 7 1.3 2 5.2 7 5.9 3 6.7 3 2.4 4 2.6 2 3.1 2 17.3 7 17.3 3 17 9 21.5 19 22.4 13 23.2 15

AdaMatting 8.5 7.4 7.5 10.6 10.2 11 11.1 13 10.8 12 4.9 12 5.4 11 6.6 14 3.6 13 3.4 7 3.4 16 0.9 1 0.9 1 1.8 6 4.7 1 6.8 5 9.3 15 2.2 2 2.6 3 3.3 3 19.2 15 19.8 17 18.7 17 17.8 4 19.1 3 18.6 2

Background Matting 8.6 6.4 6.4 13 9.3 6 10 6 10.1 7 4.5 5 5.1 9 6.7 15 2.9 6 3.3 5 2.9 6 1 8 1.2 6 2.2 17 5.2 6 6 4 7.8 5 2.8 10 3.4 9 4.3 12 16.4 3 17.3 4 16.4 6 19.5 7 20.9 8 27.9 36

SampleNet Matting 8.8 7 8.3 11.3 9.1 4 9.7 4 9.8 6 4.3 1 4.8 4 5.1 2 3.4 12 3.7 12 3.2 13 0.9 4 1.1 4 2 9 5.1 5 6.8 6 9.7 18 2.5 6 4 13 3.7 6 18.6 14 19.3 14 19.1 20 20 10 21.6 9 23.2 16

GCA Matting 9.9 10.9 7 11.9 8.8 2 9.5 3 11.1 14 4.9 11 4.8 6 5.8 8 3.4 11 3.7 9 3.2 12 1.1 13 1.2 5 1.3 3 5.7 14 6.9 8 7.6 4 2.8 9 3.1 5 4.5 16 18.3 11 19.2 10 18.5 15 20.8 16 21.7 10 24.7 23

FE2E High-Quality Matting 10.6 9.5 11.8 10.6 10.1 10 11.1 11 9.3 4 5.5 17 6.4 15 6.9 17 3.4 10 3.7 10 3.2 11 1 7 1.7 11 1.9 7 5.7 13 7.8 17 11 23 2.5 5 3.8 11 3.8 7 17.3 6 18.4 8 17.4 12 19.6 8 21.8 11 20.2 4

ATNet Matting 11.3 12.8 9.8 11.3 9.7 9 10.2 8 9.6 5 4.5 4 4.8 3 4.4 1 3.7 14 3.9 13 3.4 17 1.7 23 1.9 13 2.2 15 5.9 19 7 10 9.3 14 2.9 11 3.3 8 3.9 9 19.8 17 20.6 18 20.7 26 19 5 19.2 5 20.1 3

VDRN Matting 11.3 13.3 11.3 9.4 8.9 3 9.4 2 9.3 2 5.2 14 5.6 13 6.6 13 2.8 5 3.3 6 2.7 3 1.8 26 1.9 14 2 8 5.7 12 7.1 11 8.3 6 3 12 3.5 10 3.6 5 17.6 8 18.3 7 16.9 8 23.2 26 25.9 27 26.5 30

Deep Matting 11.6 13.1 10.8 11 10.7 15 11.2 15 11 13 4.8 9 5.8 14 5.6 5 2.8 3 2.9 2 2.9 5 1.1 9 1.1 3 2 10 6 24 7.1 12 8.9 10 2.7 8 3.2 6 3.9 8 19.2 16 19.6 16 18.7 16 21.8 21 23.9 18 24.1 21

Information-flow matting 14 15.1 14.6 12.1 10.3 12 11.2 14 12.5 17 5.6 21 7.3 19 7.3 20 3.8 15 4.1 15 3 8 1.4 14 2.3 15 2 13 5.9 21 7.1 13 8.6 8 3.6 16 5.7 16 4.6 17 18.3 10 19.3 13 15.8 3 20.2 12 22.2 12 22.3 11

IndexNet Matting 14.9 17.5 13.6 13.6 12.6 31 13.4 17 11.4 15 4.8 8 4.9 8 5.7 6 3.3 9 4 14 3 7 1.1 11 1.5 9 1.6 4 6.4 28 7.5 16 8.9 11 3.4 13 4 12 4.1 10 18.6 13 19.1 9 18.5 14 23.4 27 25.1 24 29.3 42

DCNN Matting 16 17.9 14.1 16.1 12 25 14.1 19 14.5 23 5.3 15 6.4 16 6.8 16 3.9 17 4.5 17 3.4 15 1.6 20 2.5 17 2.2 18 6 23 6.9 9 9.1 12 4 19 6 17 5.3 19 19.9 18 19.2 12 19.1 19 19.4 6 20 6 21.2 7

AlphaGAN 16.5 17.5 16.8 15.3 9.6 8 10.7 10 10.4 9 4.7 7 5.3 10 5.4 4 3.1 8 3.7 8 3.1 9 1.1 12 1.3 8 2 12 6.4 30 8.3 25 9.3 16 3.6 15 5 14 4.3 14 20.8 19 21.5 20 20.6 25 25.7 41 28.7 39 26.7 33

Context-aware Matting 19 23 17 17 10.4 14 11.1 12 10.1 8 6.4 31 7.4 22 7.1 18 4.1 18 4.5 18 3.8 23 2.3 41 3.1 19 3 34 7.1 37 8.2 23 9.1 13 3.5 14 5.5 15 4.1 11 18.3 12 19.2 11 16.5 7 21.1 17 23.3 16 24.6 22

Three-layer graph matting 21.1 17.1 18.8 27.5 10.7 16 15.2 20 13.8 20 4.9 13 5.6 12 8.1 32 3.9 16 4.4 16 3.6 20 1 6 1.8 12 3 32 5.9 18 7.3 15 12.4 32 4.2 22 8 24 8.5 41 24.2 33 25.6 34 24.2 34 20.5 13 23.5 17 22.2 9

ATPM Matting 23.5 26.8 25.9 17.8 14 42 17.8 27 13.4 18 5.5 16 6.4 17 7.3 21 5.4 49 6.4 44 4.3 37 1.7 24 3.3 24 2.3 21 6.8 34 8 20 8.7 9 4.2 20 7.5 21 5.5 20 17.2 4 17.6 6 15.7 2 22.6 25 37.3 48 22.8 14

Three Stages Matting 24.5 24.1 24.6 24.9 11.7 24 13.9 18 13.9 21 5.6 18 7.4 21 7.9 26 4.6 30 5.5 31 4.2 32 2.2 37 4 31 3.1 37 6.5 31 11 42 11.9 27 4 17 6.5 18 4.5 15 23.3 27 23.2 29 22.3 29 19.6 9 20.8 7 22.4 12

CSC Matting 26 29.4 22.1 26.4 13.6 39 15.6 21 14.5 22 6.2 29 7.5 23 8.1 33 4.6 31 4.8 20 4.2 35 1.8 28 2.7 18 2.5 23 5.5 11 7.3 14 9.7 17 4.6 26 7.6 22 6.9 29 23.7 29 23 27 21 27 26.3 42 27.2 32 25.2 25

LNSP Matting 26 22.4 26.5 29.1 12.2 26 22.5 45 19.5 50 5.6 19 8.1 25 8.8 42 4.6 28 5.9 36 3.6 19 1.5 17 3.5 27 3.1 36 6.2 25 8.1 22 10.7 22 4 18 7.1 19 6.4 25 21.5 22 20.8 19 16.3 4 22.5 24 24.4 19 27.8 35

Graph-based sparse matting 27 27.5 27.8 25.6 12.6 32 20.5 37 14.8 27 5.7 23 7.3 18 6.4 12 4.5 26 5.3 27 3.7 21 1.4 16 3.3 25 2.3 20 6.3 27 7.9 18 11.1 24 4.2 21 8.3 27 6.4 24 28.7 46 31.3 47 27.1 43 23.6 29 25.1 23 27.3 34

KL-Divergence Based Sparse Sampling 27.3 25.6 27.3 28.9 11.6 23 17.5 26 14.7 24 5.6 20 8.5 30 8 28 4.9 42 5.3 25 3.7 22 1.5 18 3.5 26 2.1 14 5.8 16 8.3 24 14.1 40 5.6 37 9.3 32 8 37 24.6 34 27.7 41 28.9 46 20.7 15 22.7 14 23.9 20

Patch-based Matting 27.3 21.4 29.5 30.9 10.9 18 19 31 15.7 33 6 26 9.5 39 8.3 35 4.3 22 5.2 24 4.2 34 1.6 19 3.2 22 2.6 24 5.2 8 9 30 12.4 29 4.7 27 9.7 34 7 30 21.6 23 21.7 21 24.9 36 23.5 28 28.1 35 25.6 26

TSPS-RV Matting 28.6 26.8 28.5 30.6 11.3 22 16.4 24 13.7 19 6.1 27 8.1 27 8.6 39 4.5 24 5.4 29 4.1 31 1.4 15 3.3 23 3.5 46 7.9 45 8.9 28 12.4 31 6.2 41 9 30 8.7 43 22.8 26 23.5 30 21.4 28 20.7 14 28.5 37 22.2 8

Iterative Transductive Matting 29.3 30.4 29.5 28.1 13.1 36 17.2 25 15.6 32 5.7 22 8.6 32 7.8 25 5.1 45 5.5 30 3.9 24 1.9 29 5.8 42 2.6 25 6.6 32 8.5 26 13.8 39 5.4 32 10 35 7.4 34 25.5 36 24 31 23.8 33 20.1 11 22.7 15 22.7 13

Comprehensive sampling 29.8 26.4 30.3 32.6 11.2 21 18.5 30 14.8 25 6.5 35 9.5 38 8.9 44 4.5 25 4.9 21 4.1 30 1.7 22 3.1 21 2.3 22 5.4 10 9.8 34 13.4 37 5.5 35 11.5 41 7.4 36 23.9 31 22 23 22.8 30 23.8 32 28 34 28.1 37

SVR Matting 29.8 32.6 30.3 26.5 18.7 54 30.7 56 19.1 47 6.8 41 7.7 24 7.6 24 4.7 37 5 23 3.4 14 1.9 30 4.7 34 2.9 30 5.8 15 8.7 27 10.5 19 4.3 23 8 25 5.6 22 21.2 21 22.1 24 17.1 11 25.6 40 26.1 29 30.6 45

Comprehensive Weighted Color and Texture 30.3 29.6 31.6 29.6 14.6 43 16 22 15.7 34 6.8 40 10 42 7.9 27 4.3 21 5 22 4.1 28 1.7 21 3.5 28 2.2 16 5.4 9 9.9 36 12.8 35 4.3 24 7.4 20 5.2 18 28.3 45 28.1 42 25.4 39 24 34 30.2 41 28.7 40

Sparse coded matting 30.8 34 31.6 26.6 13.7 40 25.8 52 14.8 28 6.4 32 8.2 28 6.2 11 4.7 32 5.4 28 4 26 1.8 27 3.1 20 2.3 19 5.9 20 8 21 10.6 20 4.5 25 8 23 5.5 21 30.3 48 33.1 50 29.2 47 27.7 48 27.2 31 29 41

LocalSamplingAndKnnClassification 32.3 34.9 30.4 31.8 12.6 30 16 23 12.4 16 5.8 24 8.1 26 8 29 4.5 27 5.5 32 4.1 27 2.2 38 5.1 37 3.4 44 8.1 46 10.5 38 15.6 45 7.3 45 12.3 44 9.4 44 24.1 32 21.8 22 19.7 21 24.7 37 24.8 21 25.9 28

Weighted Color and Texture Matting 33 30.5 35.3 33.3 13.1 37 17.8 28 15.8 35 6.5 34 9.4 36 8.6 38 4.2 20 4.7 19 3.9 25 1.7 25 6 43 2.7 26 6.4 29 11 41 16.3 46 4.8 28 9.1 31 6.5 26 23.7 28 24.8 33 23.2 31 26.5 43 40.2 51 28.5 39

CCM 33.3 36.4 33.3 30.4 13.8 41 20.8 38 16.9 43 6.4 33 8.9 34 8.2 34 4.7 33 5.9 37 3.6 18 2.5 43 4.3 32 3 31 7 36 9 29 10.6 21 4.9 29 8.1 26 5.7 23 25.6 37 27.5 40 24.5 35 25.4 39 26.4 30 28.2 38

LNCLM matting 33.4 35.9 33.3 31.1 10.9 19 11.2 16 16.7 41 6.9 43 8.9 35 7.2 19 5.6 51 7 52 4.1 29 2.5 45 5.1 38 3.5 47 7.5 40 10 37 12 28 5.5 36 11.3 38 7.3 33 25.2 35 23 28 19.9 23 21.2 18 25 22 26.4 29

Shared Matting 33.5 31.6 37.1 31.6 10.8 17 20.5 36 15 29 7.8 47 11.6 48 8.1 30 4.2 19 5.3 26 4.2 33 2.1 32 5.8 41 2.9 29 5.9 22 9.2 31 11.4 26 5 30 8.8 28 6.8 28 34.9 53 34.9 51 34.3 51 23.9 33 28.4 36 25.7 27

Global Sampling Matting 35.9 32.5 38.6 36.5 10.9 20 22.7 46 15.4 30 6.3 30 9.5 40 9 45 4.7 34 6.4 46 4.3 39 2.2 39 5.6 40 3.4 43 6.9 35 9.6 33 12.9 36 6.3 42 12.5 45 8.6 42 25.8 38 27.5 39 25.3 38 22 22 24.4 20 23.7 19

SRLO Matting 36.8 35.4 39.4 35.8 14.7 44 18 29 17.7 45 6.9 42 10.7 44 8.9 43 4.9 43 5.7 34 4.7 47 2.1 34 6.5 44 2.8 28 6.3 26 10.9 40 15.2 44 5.4 31 11.6 42 7 32 26.5 43 29.7 44 25.1 37 21.7 20 28.5 38 22.3 10

Segmentation-based matting 37.1 37.9 36.3 37.3 12.8 35 23.5 48 16.6 40 6.6 36 8.3 29 7.3 22 4.8 41 6.1 40 4.3 40 2.1 33 3.9 30 3.1 35 6.7 33 8 19 13.4 38 6 40 8.8 29 8.2 38 31.6 49 35.6 52 38.8 53 24.5 36 32 43 26.7 32

Improved color matting 38.3 38.5 37.6 38.8 14.9 45 24.5 50 20 51 6.7 38 9.5 37 8.5 37 4.6 29 6.1 41 4.3 41 2.6 47 5.4 39 3.4 45 7.5 41 9.9 35 12.5 33 6 38 10.1 36 8.4 40 26.1 39 26.7 38 23.6 32 23.8 31 25.6 25 26.7 31

Local Spline Regression (LSR) 38.7 40.9 35.4 39.9 12.2 27 20 34 16.2 36 6.1 28 8.8 33 8.1 31 5.2 47 6.2 43 4.6 44 2.2 40 4.9 36 3.1 38 9.4 51 11.9 45 18.3 49 8.2 48 11.4 39 10.1 46 26.4 41 22.5 25 20.2 24 27 45 26 28 39.8 51

KNN Matting 38.7 40.6 40.4 35.1 16.2 49 19.7 32 16.8 42 8 48 11 45 9 47 4.7 35 6.7 49 4.3 36 3 50 7.7 50 3.7 48 9.2 49 11.3 43 11.3 25 6 39 10.4 37 6.7 27 18.1 9 19.6 15 17 10 27.4 46 41 52 32.7 46

Global Sampling Matting (filter version) 38.9 36.6 41.6 38.5 12.3 28 24.3 49 16.3 37 7.3 45 10.2 43 9.5 48 5.1 46 6.4 45 4.7 48 2.4 42 4.7 35 3.2 40 5.9 17 9.5 32 12.4 30 6.5 43 13.1 46 8.3 39 26.5 42 28.3 43 30 49 23.6 30 29.1 40 23.5 17

Learning Based Matting 40.1 40.6 39.3 40.4 16 48 22 44 18.7 46 6.6 37 7.4 20 7.4 23 4.8 39 6.1 39 4.3 42 2.1 31 3.7 29 2.8 27 7.5 42 14.5 51 19.5 52 8.6 52 14.1 49 14.6 54 22.5 24 24.8 32 19.9 22 34.6 52 38.5 50 51.2 57

LMSPIR 41.2 40.1 42.9 40.5 15.2 47 20 33 19.1 48 6.7 39 11.2 46 8.7 41 4.8 40 5.8 35 4.6 46 2.1 35 6.8 47 3 33 7.9 44 14.3 50 20.2 53 5.5 34 11.4 40 7 31 29.7 47 31 46 29.6 48 24 35 34.2 46 25 24

Shared Matting (Real Time) 41.6 40.3 42.5 42 12.4 29 21.6 40 16.3 38 9.5 51 13.5 50 9.9 49 4.4 23 5.6 33 4.4 43 2.5 46 6.8 48 3.2 41 7.1 38 10.8 39 12.6 34 5.4 33 9.7 33 7.4 35 35.5 55 35.8 53 35.5 52 27.6 47 33.4 44 29.8 44

Closed-Form Matting 42 40.6 39.6 45.9 12.7 33 21.9 43 17.2 44 5.9 25 8.5 31 8.6 40 4.7 36 6 38 4.3 38 2.2 36 4.6 33 3.3 42 9.3 50 12.1 46 19.3 51 8.3 49 14.9 51 13.4 53 34.2 52 32.4 49 27.4 44 26.5 44 25.7 26 48.3 55

Improving Sampling Criterion 45.8 44.9 47.5 44.9 12.7 34 21.1 39 16.4 39 11.5 54 17 55 12.1 54 5.8 53 8.1 55 5.7 53 5.4 58 12.1 57 6.6 57 9.6 53 15.7 52 17.8 47 10.2 54 17 52 11.2 51 23.8 30 26.7 37 25.9 40 22.2 23 27.3 33 23.7 18

Cell-based matting Laplacian 46.3 48.4 45 45.4 15.1 46 21.7 41 15.6 31 7.6 46 11.4 47 9 46 5.7 52 6.7 50 5.2 51 3.1 51 6.7 45 4.5 51 8.6 47 11.4 44 14.9 42 8.5 51 13.5 48 11.1 49 27.7 44 26.2 36 27.6 45 32.4 50 37.6 49 37.9 48

Large Kernel Matting 46.5 48.1 45.9 45.5 17.2 50 21.8 42 20.7 52 7.2 44 9.6 41 8.4 36 5.3 48 6.6 48 4.6 45 2.9 49 8.2 52 4.2 49 8.6 48 12.1 47 14.7 41 8 47 13.4 47 11.2 50 33 50 31.8 48 26.1 41 32.1 49 32 42 38.4 50

Robust Matting 47.2 43.5 48.1 50 17.3 51 28.4 54 21.1 53 10.1 52 16.9 54 11.4 52 4.8 38 6.5 47 5 50 2.8 48 7.3 49 4.4 50 7.3 39 14 49 18.1 48 6.8 44 14.6 50 10.6 48 22.7 25 26.1 35 32.1 50 34.4 51 37 47 38 49

SPS matting 49.3 48.6 52.3 46.9 13.4 38 23 47 14.8 26 12.5 55 18.5 56 12.4 55 6.6 57 9.4 58 6.5 58 4.5 56 12.7 58 5.4 54 9.5 52 16.4 54 18.6 50 9.8 53 18.1 55 10.6 47 26.1 40 30.9 45 26.2 42 25 38 33.5 45 29.5 43

High-res matting 50.2 48.8 51.5 50.4 18.6 53 25.8 51 24.6 55 8.6 49 14.1 51 11.1 51 5 44 6.2 42 4.8 49 2.5 44 8.3 53 3.2 39 7.8 43 14 48 21.4 54 8.5 50 18.1 56 12.2 52 35.3 54 38.1 55 42.6 56 38.7 53 54.6 56 36.8 47

Transfusive Weights 50.7 50.8 50.5 50.9 23.2 55 26.7 53 22.4 54 9.2 50 11.9 49 10.4 50 6.1 55 8.1 54 5.9 55 3.8 54 8 51 5.3 53 12.9 56 21.4 56 37.6 60 13.1 59 22.8 58 18.3 59 20.9 20 22.9 26 19 18 59.5 57 65.7 57 72.8 58

Random Walk Matting 53.9 55.5 51.5 54.8 17.9 52 20.3 35 19.4 49 11.3 53 15.6 52 11.8 53 5.8 54 7 51 6.3 57 3.4 52 6.7 46 4.6 52 13.1 58 22.1 57 27.4 56 12.3 58 18 54 15.7 57 44.1 59 43.5 58 41 55 75.1 58 81.8 59 80.6 59

Geodesic Matting 55.1 56 54.9 54.5 26.9 58 38.5 59 32.5 58 14.2 56 16.5 53 17.4 57 11.7 60 14 61 9.4 60 7.6 60 15.1 59 8.7 60 12.8 55 16.7 55 15.1 43 7.3 46 12.1 43 9.8 45 37.3 57 37.4 54 42.8 57 48.6 56 50 55 48.6 56

Iterative BP Matting 56.2 55.5 56.1 57 23.6 56 29.9 55 27.2 56 16.7 57 24.3 58 20.7 60 6.7 58 9 56 6.3 56 3.8 53 11.3 55 6.8 59 14.1 59 22.8 58 27.9 57 11.4 56 19 57 14.7 55 33.4 51 39.3 56 47.5 60 40.6 54 48.1 54 45.1 53

Easy Matting 56.6 57 56 56.9 23.9 57 32.6 57 30 57 17.1 58 21.8 57 19.4 59 6.3 56 7.5 53 5.8 54 4.7 57 10.5 54 5.6 55 12.1 54 15.7 53 22.9 55 11.2 55

Sum of Absolute Differences	overall	avg. small	avg. large	avg. user	Troll (Strongly Transparent) Input			Doll (Strongly Transparent) Input			Donkey (Medium Transparent) Input			Elephant (Medium Transparent) Input			Plant (Little Transparent) Input			Pineapple (Little Transparent) Input			Plastic bag (Highly Transparent) Input			Net (Highly Transparent) Input
	rank	rank	rank	rank	small	large	user	small	large	user	small	large	user	small	large	user	small	large	user	small	large	user	small	large	user	small	large	user
SIM	2.7	2.9	2	3.3	8.3 1	8.7 1	9 1	4.8 10	4.8 7	6 9	2.2 1	2.2 1	2 1	0.9 5	0.9 2	1.1 1	4.7 2	5.1 1	6.3 2	2.2 1	2.3 1	2.5 1	15.9 1	16.3 1	16.3 5	17.8 2	18 2	20.9 6
PIIAMatting	5.3	3.1	7	5.9	9.1 5	10 7	9.3 3	4.3 2	4.6 2	5.4 3	2.8 4	3.7 11	2.7 4	0.9 2	2.3 16	2 11	4.7 3	6.8 7	8.3 7	2.2 3	2.7 4	4.3 13	17.2 5	17.3 5	15.5 1	16.6 1	19.1 4	20.2 5
IamAlpha	5.3	4.6	4.5	6.9	10.4 13	10.5 9	10.8 11	4.4 3	4.4 1	6.1 10	2.7 2	3 4	3.2 10	0.9 3	1.7 10	1.7 5	4.8 4	5.2 2	6.2 1	2.5 7	3.3 7	3.3 4	16.2 2	16.9 2	17.9 13	17.8 3	18 1	18 1
HDMatt	6.6	8.4	5.1	6.3	9.5 7	10 5	10.7 10	4.7 6	4.8 5	5.8 7	2.9 7	3 3	2.6 2	1.1 10	1.2 7	1.3 2	5.2 7	5.9 3	6.7 3	2.4 4	2.6 2	3.1 2	17.3 7	17.3 3	17 9	21.5 19	22.4 13	23.2 15
AdaMatting	8.5	7.4	7.5	10.6	10.2 11	11.1 13	10.8 12	4.9 12	5.4 11	6.6 14	3.6 13	3.4 7	3.4 16	0.9 1	0.9 1	1.8 6	4.7 1	6.8 5	9.3 15	2.2 2	2.6 3	3.3 3	19.2 15	19.8 17	18.7 17	17.8 4	19.1 3	18.6 2
Background Matting	8.6	6.4	6.4	13	9.3 6	10 6	10.1 7	4.5 5	5.1 9	6.7 15	2.9 6	3.3 5	2.9 6	1 8	1.2 6	2.2 17	5.2 6	6 4	7.8 5	2.8 10	3.4 9	4.3 12	16.4 3	17.3 4	16.4 6	19.5 7	20.9 8	27.9 36
SampleNet Matting	8.8	7	8.3	11.3	9.1 4	9.7 4	9.8 6	4.3 1	4.8 4	5.1 2	3.4 12	3.7 12	3.2 13	0.9 4	1.1 4	2 9	5.1 5	6.8 6	9.7 18	2.5 6	4 13	3.7 6	18.6 14	19.3 14	19.1 20	20 10	21.6 9	23.2 16
GCA Matting	9.9	10.9	7	11.9	8.8 2	9.5 3	11.1 14	4.9 11	4.8 6	5.8 8	3.4 11	3.7 9	3.2 12	1.1 13	1.2 5	1.3 3	5.7 14	6.9 8	7.6 4	2.8 9	3.1 5	4.5 16	18.3 11	19.2 10	18.5 15	20.8 16	21.7 10	24.7 23
FE2E High-Quality Matting	10.6	9.5	11.8	10.6	10.1 10	11.1 11	9.3 4	5.5 17	6.4 15	6.9 17	3.4 10	3.7 10	3.2 11	1 7	1.7 11	1.9 7	5.7 13	7.8 17	11 23	2.5 5	3.8 11	3.8 7	17.3 6	18.4 8	17.4 12	19.6 8	21.8 11	20.2 4
ATNet Matting	11.3	12.8	9.8	11.3	9.7 9	10.2 8	9.6 5	4.5 4	4.8 3	4.4 1	3.7 14	3.9 13	3.4 17	1.7 23	1.9 13	2.2 15	5.9 19	7 10	9.3 14	2.9 11	3.3 8	3.9 9	19.8 17	20.6 18	20.7 26	19 5	19.2 5	20.1 3
VDRN Matting	11.3	13.3	11.3	9.4	8.9 3	9.4 2	9.3 2	5.2 14	5.6 13	6.6 13	2.8 5	3.3 6	2.7 3	1.8 26	1.9 14	2 8	5.7 12	7.1 11	8.3 6	3 12	3.5 10	3.6 5	17.6 8	18.3 7	16.9 8	23.2 26	25.9 27	26.5 30
Deep Matting	11.6	13.1	10.8	11	10.7 15	11.2 15	11 13	4.8 9	5.8 14	5.6 5	2.8 3	2.9 2	2.9 5	1.1 9	1.1 3	2 10	6 24	7.1 12	8.9 10	2.7 8	3.2 6	3.9 8	19.2 16	19.6 16	18.7 16	21.8 21	23.9 18	24.1 21
Information-flow matting	14	15.1	14.6	12.1	10.3 12	11.2 14	12.5 17	5.6 21	7.3 19	7.3 20	3.8 15	4.1 15	3 8	1.4 14	2.3 15	2 13	5.9 21	7.1 13	8.6 8	3.6 16	5.7 16	4.6 17	18.3 10	19.3 13	15.8 3	20.2 12	22.2 12	22.3 11
IndexNet Matting	14.9	17.5	13.6	13.6	12.6 31	13.4 17	11.4 15	4.8 8	4.9 8	5.7 6	3.3 9	4 14	3 7	1.1 11	1.5 9	1.6 4	6.4 28	7.5 16	8.9 11	3.4 13	4 12	4.1 10	18.6 13	19.1 9	18.5 14	23.4 27	25.1 24	29.3 42
DCNN Matting	16	17.9	14.1	16.1	12 25	14.1 19	14.5 23	5.3 15	6.4 16	6.8 16	3.9 17	4.5 17	3.4 15	1.6 20	2.5 17	2.2 18	6 23	6.9 9	9.1 12	4 19	6 17	5.3 19	19.9 18	19.2 12	19.1 19	19.4 6	20 6	21.2 7
AlphaGAN	16.5	17.5	16.8	15.3	9.6 8	10.7 10	10.4 9	4.7 7	5.3 10	5.4 4	3.1 8	3.7 8	3.1 9	1.1 12	1.3 8	2 12	6.4 30	8.3 25	9.3 16	3.6 15	5 14	4.3 14	20.8 19	21.5 20	20.6 25	25.7 41	28.7 39	26.7 33
Context-aware Matting	19	23	17	17	10.4 14	11.1 12	10.1 8	6.4 31	7.4 22	7.1 18	4.1 18	4.5 18	3.8 23	2.3 41	3.1 19	3 34	7.1 37	8.2 23	9.1 13	3.5 14	5.5 15	4.1 11	18.3 12	19.2 11	16.5 7	21.1 17	23.3 16	24.6 22
Three-layer graph matting	21.1	17.1	18.8	27.5	10.7 16	15.2 20	13.8 20	4.9 13	5.6 12	8.1 32	3.9 16	4.4 16	3.6 20	1 6	1.8 12	3 32	5.9 18	7.3 15	12.4 32	4.2 22	8 24	8.5 41	24.2 33	25.6 34	24.2 34	20.5 13	23.5 17	22.2 9
ATPM Matting	23.5	26.8	25.9	17.8	14 42	17.8 27	13.4 18	5.5 16	6.4 17	7.3 21	5.4 49	6.4 44	4.3 37	1.7 24	3.3 24	2.3 21	6.8 34	8 20	8.7 9	4.2 20	7.5 21	5.5 20	17.2 4	17.6 6	15.7 2	22.6 25	37.3 48	22.8 14
Three Stages Matting	24.5	24.1	24.6	24.9	11.7 24	13.9 18	13.9 21	5.6 18	7.4 21	7.9 26	4.6 30	5.5 31	4.2 32	2.2 37	4 31	3.1 37	6.5 31	11 42	11.9 27	4 17	6.5 18	4.5 15	23.3 27	23.2 29	22.3 29	19.6 9	20.8 7	22.4 12
CSC Matting	26	29.4	22.1	26.4	13.6 39	15.6 21	14.5 22	6.2 29	7.5 23	8.1 33	4.6 31	4.8 20	4.2 35	1.8 28	2.7 18	2.5 23	5.5 11	7.3 14	9.7 17	4.6 26	7.6 22	6.9 29	23.7 29	23 27	21 27	26.3 42	27.2 32	25.2 25
LNSP Matting	26	22.4	26.5	29.1	12.2 26	22.5 45	19.5 50	5.6 19	8.1 25	8.8 42	4.6 28	5.9 36	3.6 19	1.5 17	3.5 27	3.1 36	6.2 25	8.1 22	10.7 22	4 18	7.1 19	6.4 25	21.5 22	20.8 19	16.3 4	22.5 24	24.4 19	27.8 35
Graph-based sparse matting	27	27.5	27.8	25.6	12.6 32	20.5 37	14.8 27	5.7 23	7.3 18	6.4 12	4.5 26	5.3 27	3.7 21	1.4 16	3.3 25	2.3 20	6.3 27	7.9 18	11.1 24	4.2 21	8.3 27	6.4 24	28.7 46	31.3 47	27.1 43	23.6 29	25.1 23	27.3 34
KL-Divergence Based Sparse Sampling	27.3	25.6	27.3	28.9	11.6 23	17.5 26	14.7 24	5.6 20	8.5 30	8 28	4.9 42	5.3 25	3.7 22	1.5 18	3.5 26	2.1 14	5.8 16	8.3 24	14.1 40	5.6 37	9.3 32	8 37	24.6 34	27.7 41	28.9 46	20.7 15	22.7 14	23.9 20
Patch-based Matting	27.3	21.4	29.5	30.9	10.9 18	19 31	15.7 33	6 26	9.5 39	8.3 35	4.3 22	5.2 24	4.2 34	1.6 19	3.2 22	2.6 24	5.2 8	9 30	12.4 29	4.7 27	9.7 34	7 30	21.6 23	21.7 21	24.9 36	23.5 28	28.1 35	25.6 26
TSPS-RV Matting	28.6	26.8	28.5	30.6	11.3 22	16.4 24	13.7 19	6.1 27	8.1 27	8.6 39	4.5 24	5.4 29	4.1 31	1.4 15	3.3 23	3.5 46	7.9 45	8.9 28	12.4 31	6.2 41	9 30	8.7 43	22.8 26	23.5 30	21.4 28	20.7 14	28.5 37	22.2 8
Iterative Transductive Matting	29.3	30.4	29.5	28.1	13.1 36	17.2 25	15.6 32	5.7 22	8.6 32	7.8 25	5.1 45	5.5 30	3.9 24	1.9 29	5.8 42	2.6 25	6.6 32	8.5 26	13.8 39	5.4 32	10 35	7.4 34	25.5 36	24 31	23.8 33	20.1 11	22.7 15	22.7 13
Comprehensive sampling	29.8	26.4	30.3	32.6	11.2 21	18.5 30	14.8 25	6.5 35	9.5 38	8.9 44	4.5 25	4.9 21	4.1 30	1.7 22	3.1 21	2.3 22	5.4 10	9.8 34	13.4 37	5.5 35	11.5 41	7.4 36	23.9 31	22 23	22.8 30	23.8 32	28 34	28.1 37
SVR Matting	29.8	32.6	30.3	26.5	18.7 54	30.7 56	19.1 47	6.8 41	7.7 24	7.6 24	4.7 37	5 23	3.4 14	1.9 30	4.7 34	2.9 30	5.8 15	8.7 27	10.5 19	4.3 23	8 25	5.6 22	21.2 21	22.1 24	17.1 11	25.6 40	26.1 29	30.6 45
Comprehensive Weighted Color and Texture	30.3	29.6	31.6	29.6	14.6 43	16 22	15.7 34	6.8 40	10 42	7.9 27	4.3 21	5 22	4.1 28	1.7 21	3.5 28	2.2 16	5.4 9	9.9 36	12.8 35	4.3 24	7.4 20	5.2 18	28.3 45	28.1 42	25.4 39	24 34	30.2 41	28.7 40
Sparse coded matting	30.8	34	31.6	26.6	13.7 40	25.8 52	14.8 28	6.4 32	8.2 28	6.2 11	4.7 32	5.4 28	4 26	1.8 27	3.1 20	2.3 19	5.9 20	8 21	10.6 20	4.5 25	8 23	5.5 21	30.3 48	33.1 50	29.2 47	27.7 48	27.2 31	29 41
LocalSamplingAndKnnClassification	32.3	34.9	30.4	31.8	12.6 30	16 23	12.4 16	5.8 24	8.1 26	8 29	4.5 27	5.5 32	4.1 27	2.2 38	5.1 37	3.4 44	8.1 46	10.5 38	15.6 45	7.3 45	12.3 44	9.4 44	24.1 32	21.8 22	19.7 21	24.7 37	24.8 21	25.9 28
Weighted Color and Texture Matting	33	30.5	35.3	33.3	13.1 37	17.8 28	15.8 35	6.5 34	9.4 36	8.6 38	4.2 20	4.7 19	3.9 25	1.7 25	6 43	2.7 26	6.4 29	11 41	16.3 46	4.8 28	9.1 31	6.5 26	23.7 28	24.8 33	23.2 31	26.5 43	40.2 51	28.5 39
CCM	33.3	36.4	33.3	30.4	13.8 41	20.8 38	16.9 43	6.4 33	8.9 34	8.2 34	4.7 33	5.9 37	3.6 18	2.5 43	4.3 32	3 31	7 36	9 29	10.6 21	4.9 29	8.1 26	5.7 23	25.6 37	27.5 40	24.5 35	25.4 39	26.4 30	28.2 38
LNCLM matting	33.4	35.9	33.3	31.1	10.9 19	11.2 16	16.7 41	6.9 43	8.9 35	7.2 19	5.6 51	7 52	4.1 29	2.5 45	5.1 38	3.5 47	7.5 40	10 37	12 28	5.5 36	11.3 38	7.3 33	25.2 35	23 28	19.9 23	21.2 18	25 22	26.4 29
Shared Matting	33.5	31.6	37.1	31.6	10.8 17	20.5 36	15 29	7.8 47	11.6 48	8.1 30	4.2 19	5.3 26	4.2 33	2.1 32	5.8 41	2.9 29	5.9 22	9.2 31	11.4 26	5 30	8.8 28	6.8 28	34.9 53	34.9 51	34.3 51	23.9 33	28.4 36	25.7 27
Global Sampling Matting	35.9	32.5	38.6	36.5	10.9 20	22.7 46	15.4 30	6.3 30	9.5 40	9 45	4.7 34	6.4 46	4.3 39	2.2 39	5.6 40	3.4 43	6.9 35	9.6 33	12.9 36	6.3 42	12.5 45	8.6 42	25.8 38	27.5 39	25.3 38	22 22	24.4 20	23.7 19
SRLO Matting	36.8	35.4	39.4	35.8	14.7 44	18 29	17.7 45	6.9 42	10.7 44	8.9 43	4.9 43	5.7 34	4.7 47	2.1 34	6.5 44	2.8 28	6.3 26	10.9 40	15.2 44	5.4 31	11.6 42	7 32	26.5 43	29.7 44	25.1 37	21.7 20	28.5 38	22.3 10
Segmentation-based matting	37.1	37.9	36.3	37.3	12.8 35	23.5 48	16.6 40	6.6 36	8.3 29	7.3 22	4.8 41	6.1 40	4.3 40	2.1 33	3.9 30	3.1 35	6.7 33	8 19	13.4 38	6 40	8.8 29	8.2 38	31.6 49	35.6 52	38.8 53	24.5 36	32 43	26.7 32
Improved color matting	38.3	38.5	37.6	38.8	14.9 45	24.5 50	20 51	6.7 38	9.5 37	8.5 37	4.6 29	6.1 41	4.3 41	2.6 47	5.4 39	3.4 45	7.5 41	9.9 35	12.5 33	6 38	10.1 36	8.4 40	26.1 39	26.7 38	23.6 32	23.8 31	25.6 25	26.7 31
Local Spline Regression (LSR)	38.7	40.9	35.4	39.9	12.2 27	20 34	16.2 36	6.1 28	8.8 33	8.1 31	5.2 47	6.2 43	4.6 44	2.2 40	4.9 36	3.1 38	9.4 51	11.9 45	18.3 49	8.2 48	11.4 39	10.1 46	26.4 41	22.5 25	20.2 24	27 45	26 28	39.8 51
KNN Matting	38.7	40.6	40.4	35.1	16.2 49	19.7 32	16.8 42	8 48	11 45	9 47	4.7 35	6.7 49	4.3 36	3 50	7.7 50	3.7 48	9.2 49	11.3 43	11.3 25	6 39	10.4 37	6.7 27	18.1 9	19.6 15	17 10	27.4 46	41 52	32.7 46
Global Sampling Matting (filter version)	38.9	36.6	41.6	38.5	12.3 28	24.3 49	16.3 37	7.3 45	10.2 43	9.5 48	5.1 46	6.4 45	4.7 48	2.4 42	4.7 35	3.2 40	5.9 17	9.5 32	12.4 30	6.5 43	13.1 46	8.3 39	26.5 42	28.3 43	30 49	23.6 30	29.1 40	23.5 17
Learning Based Matting	40.1	40.6	39.3	40.4	16 48	22 44	18.7 46	6.6 37	7.4 20	7.4 23	4.8 39	6.1 39	4.3 42	2.1 31	3.7 29	2.8 27	7.5 42	14.5 51	19.5 52	8.6 52	14.1 49	14.6 54	22.5 24	24.8 32	19.9 22	34.6 52	38.5 50	51.2 57
LMSPIR	41.2	40.1	42.9	40.5	15.2 47	20 33	19.1 48	6.7 39	11.2 46	8.7 41	4.8 40	5.8 35	4.6 46	2.1 35	6.8 47	3 33	7.9 44	14.3 50	20.2 53	5.5 34	11.4 40	7 31	29.7 47	31 46	29.6 48	24 35	34.2 46	25 24
Shared Matting (Real Time)	41.6	40.3	42.5	42	12.4 29	21.6 40	16.3 38	9.5 51	13.5 50	9.9 49	4.4 23	5.6 33	4.4 43	2.5 46	6.8 48	3.2 41	7.1 38	10.8 39	12.6 34	5.4 33	9.7 33	7.4 35	35.5 55	35.8 53	35.5 52	27.6 47	33.4 44	29.8 44
Closed-Form Matting	42	40.6	39.6	45.9	12.7 33	21.9 43	17.2 44	5.9 25	8.5 31	8.6 40	4.7 36	6 38	4.3 38	2.2 36	4.6 33	3.3 42	9.3 50	12.1 46	19.3 51	8.3 49	14.9 51	13.4 53	34.2 52	32.4 49	27.4 44	26.5 44	25.7 26	48.3 55
Improving Sampling Criterion	45.8	44.9	47.5	44.9	12.7 34	21.1 39	16.4 39	11.5 54	17 55	12.1 54	5.8 53	8.1 55	5.7 53	5.4 58	12.1 57	6.6 57	9.6 53	15.7 52	17.8 47	10.2 54	17 52	11.2 51	23.8 30	26.7 37	25.9 40	22.2 23	27.3 33	23.7 18
Cell-based matting Laplacian	46.3	48.4	45	45.4	15.1 46	21.7 41	15.6 31	7.6 46	11.4 47	9 46	5.7 52	6.7 50	5.2 51	3.1 51	6.7 45	4.5 51	8.6 47	11.4 44	14.9 42	8.5 51	13.5 48	11.1 49	27.7 44	26.2 36	27.6 45	32.4 50	37.6 49	37.9 48
Large Kernel Matting	46.5	48.1	45.9	45.5	17.2 50	21.8 42	20.7 52	7.2 44	9.6 41	8.4 36	5.3 48	6.6 48	4.6 45	2.9 49	8.2 52	4.2 49	8.6 48	12.1 47	14.7 41	8 47	13.4 47	11.2 50	33 50	31.8 48	26.1 41	32.1 49	32 42	38.4 50
Robust Matting	47.2	43.5	48.1	50	17.3 51	28.4 54	21.1 53	10.1 52	16.9 54	11.4 52	4.8 38	6.5 47	5 50	2.8 48	7.3 49	4.4 50	7.3 39	14 49	18.1 48	6.8 44	14.6 50	10.6 48	22.7 25	26.1 35	32.1 50	34.4 51	37 47	38 49
SPS matting	49.3	48.6	52.3	46.9	13.4 38	23 47	14.8 26	12.5 55	18.5 56	12.4 55	6.6 57	9.4 58	6.5 58	4.5 56	12.7 58	5.4 54	9.5 52	16.4 54	18.6 50	9.8 53	18.1 55	10.6 47	26.1 40	30.9 45	26.2 42	25 38	33.5 45	29.5 43
High-res matting	50.2	48.8	51.5	50.4	18.6 53	25.8 51	24.6 55	8.6 49	14.1 51	11.1 51	5 44	6.2 42	4.8 49	2.5 44	8.3 53	3.2 39	7.8 43	14 48	21.4 54	8.5 50	18.1 56	12.2 52	35.3 54	38.1 55	42.6 56	38.7 53	54.6 56	36.8 47
Transfusive Weights	50.7	50.8	50.5	50.9	23.2 55	26.7 53	22.4 54	9.2 50	11.9 49	10.4 50	6.1 55	8.1 54	5.9 55	3.8 54	8 51	5.3 53	12.9 56	21.4 56	37.6 60	13.1 59	22.8 58	18.3 59	20.9 20	22.9 26	19 18	59.5 57	65.7 57	72.8 58
Random Walk Matting	53.9	55.5	51.5	54.8	17.9 52	20.3 35	19.4 49	11.3 53	15.6 52	11.8 53	5.8 54	7 51	6.3 57	3.4 52	6.7 46	4.6 52	13.1 58	22.1 57	27.4 56	12.3 58	18 54	15.7 57	44.1 59	43.5 58	41 55	75.1 58	81.8 59	80.6 59
Geodesic Matting	55.1	56	54.9	54.5	26.9 58	38.5 59	32.5 58	14.2 56	16.5 53	17.4 57	11.7 60	14 61	9.4 60	7.6 60	15.1 59	8.7 60	12.8 55	16.7 55	15.1 43	7.3 46	12.1 43	9.8 45	37.3 57	37.4 54	42.8 57	48.6 56	50 55	48.6 56
Iterative BP Matting	56.2	55.5	56.1	57	23.6 56	29.9 55	27.2 56	16.7 57	24.3 58	20.7 60	6.7 58	9 56	6.3 56	3.8 53	11.3 55	6.8 59	14.1 59	22.8 58	27.9 57	11.4 56	19 57	14.7 55	33.4 51	39.3 56	47.5 60	40.6 54	48.1 54	45.1 53
Easy Matting	56.6	57	56	56.9	23.9 57	32.6 57	30 57	17.1 58	21.8 57	19.4 59	6.3 56	7.5 53	5.8 54	4.7 57	10.5 54	5.6 55	12.1 54	15.7 53	22.9 55	11.2 55