What is Face Marking

Face marking is feature for digital signage projects that allows DISPL Player to mark and later remember that specific customer by it's face hash identifier, and offer him/her a different scene interaction. 

Use case: Shopping mall totem special discount, redeemable at POS device using face marking 

As soon as a customer interacts with the signage scene design to mark his face, a confirmation is sent.

As soon as the customer arrives at the POS device, a special template face recognition controller will check if this customer was marked before. If so, he receives the DISCOUNT APPLIED interactive scene.  

This offers an additional depth in interactivity with your customers, and add extra possibilities for your business marketing approach. 

How it works

DISPL Player analyzes visitor faces via AI-powered face recognition; a face recognition generates what is called a "face hash", an individualized descriptor of a face. A single visitor may have several face hashes attributed to them. 

 Example: "1a7c07d4c0df165ab91653cb9d128b64"

This face hash is shared via p2p synchronization to all DISPL devices connected to the same local network. This is a example of  a face hash being shared between devices.

[p2pt] 21.12.2025 22:09:38 -3 f:v6 m {
  "st": "1a7c07d4c0df165ab91653cb9d128b64",
  "fr": "13106",
  "cmd": "sc"

The face mark is, essentially, a boolean value (set either true or false) added to the visitor descriptor attributes, which is then shared via p2p to the devices through local network. In the next example, the information of one face mark called "10disc" is added as true, for a face hash:

[p2pt] 21.12.2025 22:15:47 -3 f:attrs m {
  "c": "a",
  "d": {

    "10disc": true,
    ":time": 1766366147528,
    ":face": "88267a0373a4d86513cef189d122dd1d",
  }

This following example showcases several face marks added to a single face hash.

[p2pt] 21.12.2025 22:15:47 -3 f:attrs m {
  "c": "a",
  "d": {
    "40disc": true,
    "70disc": true,
    "90disc": true,
    "50disc": true,
    "10disc": true,
    ":time": 1766366147528,
    "gratis": true,
    ":face": "88267a0373a4d86513cef189d122dd1d",
    "60disc": true,
    "80disc": true,
    "30disc": true,
    "20disc": true
  }

The face hash, together with the face marks, are remembered for a period of time up until this visitor's data is uploaded to the server. Thus, Face marking is completely dependent on the configured Session Time. 

Face marking is not permanent, and will reset between days, so the same customer will be marked again at the next day as a new visitor would.

If you wish a permanent marking solution for your Signage projects, please check the "Photo" face recognition controller feature, used mainly for VIP visitors, blacklisted visitors and employees. 

How to implement face marking in DISPL Designer

Refer to this article.

Testing and troubleshooting the Face Mark feature

Refer to this article.