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face-reidentification-retail-0095

Use Case and High-Level Description

This is a lightweight network for the face re-identification scenario. It is based on MobileNet V2 backbone, which consists of 3x3 inverted residual blocks with squeeze-excitation attention modules. Instead of the ReLU6 activations used in the original MobileNet V2, this network uses PReLU ones. After the backbone, the network applies global depthwise pooling and then uses 1x1 convolution to create the final embedding vector. The model produces feature vectors which should be close in cosine distance for similar faces and far for different faces.

Example

Specification

Metric

Value

LFW accuracy

0.9947

Face location requirements

Tight aligned crop

GFlops

0.588

MParams

1.107

Source framework

PyTorch*

LFW metric is the accuracy in the pairwise re-identification test. See the full benchmark description for details.

The model achieves the best results if an input face is frontally oriented and aligned. Face image is aligned if five keypoints (left eye, right eye, tip of nose, left lip corner, right lip corner) are located in the following points in normalized coordinates [0,1]x[0,1]:

[(0.31556875000000000, 0.4615741071428571),
 (0.68262291666666670, 0.4615741071428571),
 (0.50026249999999990, 0.6405053571428571),
 (0.34947187500000004, 0.8246919642857142),
 (0.65343645833333330, 0.8246919642857142)]

To align the face, use a landmarks regression model: using regressed points and the given reference landmarks, build an affine transformation to transform regressed points to the reference ones and apply this transformation to the input face image.

Inputs

Input image, name: 0 , shape: 1, 3, 128, 128 in the format B, C, H, W, where:

  • B - batch size

  • C - number of channels

  • H - image height

  • W - image width

Expected color order is BGR.

Outputs

The net outputs a blob with the shape 1, 256, 1, 1, containing a row-vector of 256 floating point values. Outputs on different images are comparable in cosine distance.

Demo usage

The model can be used in the following demos provided by the Open Model Zoo to show its capabilities:

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