UPSI AFR Trial Wales v Italy, 11/03/2018

Martin Innes and Bethan Davies

Aims

• Run a replication of the Euston Trial (on a budget)

• Systematically test the ‘hit rate’ of the technology

• Explore which factors impact the technology • E.g. props, walking speed, walking direction,

‘custody’ images

Methods

• 7 volunteers • Multiple ‘walk-throughs’ under

various conditions (90+)• Different walking speeds, different

directions • Props

• Scarf • Glasses• Winter hat • Cap• Headscarf (women) / Moustache (men)

• Recorded times and compared against csv file post-event

Hit rate & images

•76% (including 1st ‘stroll’ column which seemed to have unusually high number of misses – not sure why)

•81% (not including 1st column)

The ‘bad’ photo

The ‘good’ photos

55

57

59

61

63

65

67

69

71

73

HI LT FC CK TL

Head on v DiagonalHead on Power walk Diagonal Power walk

Walking direction

Props

Normal vs. ‘crazy’ glasses

Impact of props

63 63.5 64 64.5 65 65.5 66 66.5 67

Scarf

Glasses

Hat

Cap

Headscarf/moustache

AVG SCORE WITH PROPS

55

57

59

61

63

65

67

69

71

73

75

HI DD AD LT FC CK TL

AVG PROP SCORE V AVG HEAD ON SCORE

Avg Prop score Avg head on score

Score variance

75.05

60.63

60.98

66.6

72.21

66.33

70.06

65.08

66.01

60.05

59.92

66.19

55 60 65 70 75 80

Stroll

Power walk

Jog

On phone

Stroll

Power walk

Scarf

Glasses

Hat

Cap

Headscarf/moustache

Stroll

Hea

d o

nD

iago

nal

Pro

ps5

+

LT

60.16

61.14

66.6

62.09

60.11

59.09

60.07

61.13

63.58

68.02

55 57 59 61 63 65 67 69

Stroll

Power walk

Jog

On phone

Stroll

Power walk

Scarf

Glasses

Hat

Cap

Headscarf/moustache

Stroll

Hea

d on

Dia

gona

lPr

ops

5+

FC

Gaps

• We have not tested:• Ethnicity • Low light • Weather • Controlled environment

• We suspect seasonal variation• Changing watchlist size and composition

Conclusions

• Very high hit rate 76%+ • Bad ‘custody’ images are a problem – they impact the ability to

pick people up • Our props impacted the scores we saw

• Generally, lower scores when wearing the props• Pulling the cap down could obscure the face enough to be missed• Glasses that obscured the eyes didn’t work – e.g. sunglasses • These could be problematic in the summer

Questions?