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Learning deep representation
from coarse to fine for face alignment
Zhiwen Shao
11
22
Contents
Results
Approach
33 Conclusion
Approach
 Dividing landmarks into two sets, backbone and
remainder
 A few key landmarks can coarsely determine
face shape
• brow corners, eye corners, nose tip, mouth corners
and chin tip
Approach
Approach
 Deep convolutional network outputs landmarks
location
the loss of backbone and remainder
controls the relative weight of backbone
Approach
the vector concatenating the ground truth
coordinate of landmarks
the vector concatenating the predicted coordinate
of landmarks
inter-pupil distance
Approach
Approach
 is initialized with (0.995) close to 1
• primarily predict backbone coordinates while
slightly consider remaining landmarks
 With the reduction of , the network searches the
optimal solution smoothly without missing fairly
good intermediate solutions.
Approach
Approach
Results
Results
 CFT produces a error reduction of 21.37% on the
COFW comparing to TCDCN
Results
Example alignment results on Helen and IBUG
Results
The results of RCPR and CFT on several challenge images
from COFW
Conclusion
 Coarse-to-fine training algorithm
 Our network directly predicts the coordinates of
landmarks using single network without any other
additional operations
 The training algorithm can also be applied to
other problems using deep convolutional network
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Learning deep representation from coarse to fine for face alignment

Editor's Notes

  1. Good afternoon, everyone. Today I introduce my recent work about face alignment using deep convolutional network.
  2. Next, I will introduce my approach in detail.
  3. dozens of I find that there are a few key landmarks which can coarsely determine face shape including brow corners, eye corners, nose tip, mouth corners and chin tip.
  4. Because different face alignment datasets have different annotation of landmarks, so I fix the location of backbone set eye centers are also key points, but I don’t choose them because many face alignment datasets such as Helen and 300-W don’t contain eye center landmarks.
  5. Train a deep convolutional network. So I define this loss function. E consists of two items E sub b
  6. Since the approach is evaluated based on alignment error measured by the distances between estimated landmarks and ground truths normalized with the inter-pupil distance, we use normalized Euclidean distance In this way, during training, I can directly know the performance of my network from the loss value. F hat sub b
  7. I propose a coarse-to-fine training algorithm Firstly control parameter lambda equals lambda sub 0 and is decreased gradually to 0.5. for each circulation, using current lambda value, the network is trained until convergence and the network parameters theta is updated.
  8. is very close to 1 but isn’t equal to 1 If we choose lambda sub 0 to be 1, then subsequent search process will not be smooth.
  9. It’s clearly that trained model is optimized stage by stage and the prediction of landmarks location using finally learned model theta sup star is very accurate Therefore, different from other coarse-to-fine methods,
  10. Although the mean error of CFT tested on Helen and 300-W is slightly bigger than CFSS and TCDCN, CFT performs better on challenging COFW whose faces are taken with severe occlusion. Specifically, CFT produces a significant error reduction of 21.37% on the challenging COFW in comparison to the state-of-the-art TCDCN
  11. That’s all, Thank you. Any questions?