Objects image requirements for PPE detection tool (VL)

To ensure the correct recognition of personal protective equipment, the following image requirements should be met:

1. The object to be detected (PPE) is clearly distinguishable by the human eye.
2. The image is not noisy and not distorted by compression algorithm artifacts.
3. The duration of the object's visibility is at least 8 frames.
4. There are no visible physical barriers between the camera lens and the analyzed object.

5. The minimum height of the equipment on body areas in pixels is observed:

   1. Vest—at least 50 pixels.

   2. Helmet—at least 20 pixels.

   3. Hood—at least 20 pixels.

   4. Gloves—at least 20 pixels.

6. The minimum value of pixel density per meter is observed:

   Image resolution	Minimum pixel density per meter (ratio of the object height in pixels to the object height in meters)	Minimum object height in pixels, Width x Height
   1920x1080	59	~100
   1280x720	59	~100
   640x360	59	~100