> For the complete documentation index, see [llms.txt](https://api2-ekycapis.innov8tif.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://api2-ekycapis.innov8tif.com/okayface/okayface-all/interpretation-of-results.md).

# Interpretation of Results

### Explanation of Result (integrating with OkayLive)

| Key                           | Value                                                |
| ----------------------------- | ---------------------------------------------------- |
| confidence *(OkayFace)*       | Test passes if more than 75 (recommended threshold)  |
| probability *(OkayLive)*      | Probability of liveness                              |
| score *(OkayLive)*            | Linear liveness score: bigger value means more alive |
| quality *(OkayLive)*          | Quality value                                        |
| error *(OkayFace & OkayLive)* | Error message from the server                        |

{% hint style="warning" %}
The confidence Score of OkayFace will starts to decrease if the age gap of ID card portrait and the selfie of OkayFace is more than 10 years. 
{% endhint %}

* Probability of liveness is a main response of the system.
* The image is accepted as "**live**" when a ***probability*** is **bigger** than **0.5**.
* Linear liveness score can be used for BPCER / APCER tuning. 
* The range of score is (ln 1e-7, -ln 1e-7).
* Quality value is a probability of "appropriate image".
* Probability can be **lower** than **0.5** by the reasons below.
  * Face minimal side is less than 180 pix or distance between eyes is less than 90 pix.
  * Face out-of-plane rotation is bigger than 20 degrees.
  * The distance between face and camera is very small, so the face can be significantly distorted.
  * The luminous power is insufficient.
  * High motion or gaussian blur rate or light shot.

{% hint style="info" %}
We highly advise to analyze quality value and reject inappropriate images.
{% endhint %}