person-detection-action-recognition-teacher-0002

Use Case and High-Level Description

This is an action detector for the Smart Classroom scenario. It is based on the RMNet backbone that includes depth-wise convolutions to reduce the amount of computations for the 3x3 convolution block. The first SSD head from 1/16 scale feature map has four clustered prior boxes and outputs detected persons (two class detector). The second SSD-based head predicts actions of the detected persons. Possible actions: standing, writing, demonstrating.

Example

_images/person-detection-action-recognition-teacher-0002.png

Specification

Metric

Value

Detector AP (internal test set 2)

80.0%

Accuracy (internal test set 1)

72.4%

Pose coverage

Standing, writing, demonstrating

Support of occluded pedestrians

YES

Occlusion coverage

<50%

Min pedestrian height

80 pixels (on 1080p)

GFlops

7.140

MParams

1.951

Source framework

Caffe*

Average Precision (AP) is defined as an area under the precision/recall curve.

Inputs

Image, name: data, shape: 1, 3, 400, 680 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 four branches:

  1. name: mbox_loc1/out/conv/flat, shape: b, num_priors\*4 - Box coordinates in SSD format

  2. name: mbox_main_conf/out/conv/flat/softmax/flat, shape: b, num_priors\*2 - Detection confidences

  3. name: mbox/priorbox, shape: 1, 2, num_priors\*4 - Prior boxes in SSD format

  4. name: out/anchor1, shape: b, h, w, 3 - Action confidences

  5. name: out/anchor2, shape: b, h, w, 3 - Action confidences

  6. name: out/anchor3, shape: b, h, w, 3 - Action confidences

  7. name: out/anchor4, shape: b, h, w, 3 - Action confidences

Where:

  • b - batch size

  • num_priors - number of priors in SSD format (equal to 25x43x4=4300)

  • h, w - height and width of the output feature map (h=25, w=43)

Demo usage

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