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 width or height of the equipment does not exceed 75% of the frame size.
4. The duration of the object's visibility is at least 3-8 frames. The minimum number of frames depends on the task.
5. There are no visible physical barriers between the camera lens and the analyzed object.

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

   Image resolution	Object type	Minimum pixel density per meter (ratio of the object width in pixels to the object width in meters)	Minimum object size in pixels, width x height
   1920x1080	Human	170	~102x309
   1280x720	Human	128	~77x233
   640x360	Human	80	~48x145

   
   

7. The minimum dimensions of the equipment on the body areas in pixels are observed. An example of equipment dimensions for a resolution of 1920x1080:

   1. upper body (torso) 75*100,

   2. legs 75*105,

   3. head 60*65,

   4. hands 65*60,

   5. feet 45*40,

   6. set of equipment 165*295.