de- rotating face
DESCRIPTION
De- rotating face. - Procedure Eye detection and mouth detection Measuring angle of face Rotating the face back to upright frontal position. EyemapC. High Cb and low Cr values are found the eyes(EyemapC). EyemapL. Eye contains both dark and bright pixels in the luminance component(EyemapL). - PowerPoint PPT PresentationTRANSCRIPT
De- rotating face
- Procedure1) Eye detection and mouth detection2) Measuring angle of face3) Rotating the face back to upright
frontal position
EyemapC
High Cb and low Cr values are found the eyes(EyemapC)
rr
r
brb
CofnegativetheCwhere
C
CCCEyeMapC
:~
,
,~
3
1 22
EyemapL
Eye contains both dark and bright pixels in the luminance component(EyemapL)
22
2/12
),(
1),(
1),(,
1),(),(
),(),(
yxyxR
R
RyxR
yxgwhere
yxgyxY
yxgyxYEyeMapL
Eyemap
Eyemap=(EyeMapC)AND(EyeMapL) ->Normalize Eyemap to the range [0,255]
Construction of eye map
MouthMap
The color of mouth region contains more red component and less blue component than other facial region.
Hence, Cr>Cb
222 )(b
rrr C
CCCMouthMap
Construction of the mouth map
Test
Locating Eyes
Locating mouth and rotating
Extracting face part
Result
More result
More results
Advantages
Fast to get result (1.7 seconds) It can be related to face detection.
Further study
Better lightening compensate techniques is required->Very sensitive to lightening problems
Different method to measure angle -> Eyes can’t always be detected.(Sunglasse
s, small eyes, closed eyes, etc)