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Image requirements for the Equipment detector and its sub-detectors

Hardware requirements for neural analytics operation

Camera requirements Requirements for the operation of the Equipment detection (PPE) detector are given in the table:

Camera
  • Resolution must be at least 640x360. We also don't recommend using a resolution higher than 1920×1080, since higher resolution doesn't increase the detection quality, but significantly increases the consumption of resources. The optimal resolution for solving typical tasks is 1280x720
  • The frame rate per second in the video stream from the camera is at least 3 for solving typical tasks
  • Detection-based analytics works with color images only
Note
titleAttention!
  • Correct operation of the detector isn't guaranteed if you use frames that were masked before they got into Axxon One by an IP camera or similar methods.
  • Correct operation of the
detection tool
  • detector isn't guaranteed
when using
  • if you use a fisheye lens.
  • The camera tilt angle from top to bottom on a person wearing equipment must not exceed 30°. Otherwise, the
detection tool
  • detector won't operate correctly.
    The following diagrams show the examples of:
    • The acceptable tilt angle:
      Image Modified
    • The unacceptable tilt angle:
      Image Modified
 
Lighting
  • Lighting in the scene is at least 200 lux. The
detection tool
  • detector is applicable in conditions of artificial light.
 In
  • In conditions of insufficient or excessive lighting (night or light-striking), stable operation of the analytics isn't guaranteed
  • No abrupt changes in lighting
Scene and camera angle
  • Moving objects are visually separable from each other
  • The background is mostly static and doesn't change abruptly
  • There are no products made of rods in the detection area
  • Moving objects are minimally obscured by static objects in the scene (columns, industrial products, and so on)
  • The analyzed scene doesn't have reflective surfaces. If present, they must be masked
  • Camera shake doesn't result in image offsets greater than 1%
of the frame sizeObject images
  • The detected object (equipment or PPE) must be clearly distinguishable by the human eye
  • The image isn't noisy and not distorted by the artifacts of compression algorithm
    • The width or height of the equipment doesn't exceed 75%
    • of the frame
    size
  • The duration of the object's visibility is at least 3–8 frames. The minimum number of frames depends on the task
  • There are no visible physical barriers between the camera lens and the analyzed object

  • The minimum sizes of equipment on body parts in pixels are observed. Example of equipment dimensions for a resolution of 1920x1080:

    • Upper body (torso) 75*100

    • Legs 75*105

    • Head 60*65

    • Hands 65*60

    • Feet 45*40

    • Set of equipment 165*295

    • The minimum value of pixel density per meter is observed:
    Image resolutionObject typeMinimum pixel density per meter (ratio of the object width in pixels to the object width in meters)Minimum object
    • size
    in pixels, width x height1920x1080Human170~102x3091280x720Human128~77x233640x360Human80~48x145