# Face Recognition (KOI v1.9.5)

Face Recognition is the technology of recognizing individuals from an image. This function can be realized on KOI.

### Face Recognition

<figure><img src="https://kittenbothk-eng.readthedocs.io/en/latest/_images/mcbanner.png" alt=""><figcaption></figcaption></figure>

#### **Loading Extensions**

Search "KOI" in the search bar.

<figure><img src="https://kittenbothk.readthedocs.io/en/latest/_images/koi_search.png" alt=""><figcaption></figcaption></figure>

Or copy and paste the following link to the search bar.

**<https://github.com/KittenBot/pxt-koi>**

Blocks for Face Recognition:

<figure><img src="https://kittenbothk-eng.readthedocs.io/en/latest/_images/13.png" alt=""><figcaption></figcaption></figure>

#### Sample Program:

```
Wifi connection is required for Face Recognition.

Face Recognition is a free feature, therefore you must choose a unique name for your class.
For example, common names like testing, test1, class01 are already made by others.
A maximum of 20 images can be stored in each class.
```

{% embed url="<https://makecode.microbit.org/_8TWcRzY2j1ui>" %}

### Program Flow

1: Download the program to Micro:bit.

2: Press A to store a face to the class.

3: After a shortwhile, KOI will display the gender and the age of the face detected.

```
You can change the name and reupload the program to store another face.
```

6: Press B to recognize a face

7: KOI will display the name of this face and its confidence. If a new face is detected, KOI will display “stranger”.

```
Confidence level can range from 0 to 100.
```

### Demo Video

{% embed url="<https://www.youtube.com/watch?v=XvMZMsXpg1A>" %}

### Sample Code

[1. Face Recognition(Firmware1.12.0\_Extension0.5.7)](https://makecode.microbit.org/_YdW8M1VW4UEb)

### Extension Version and Updates

There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.

[Makecode Extension Update](https://kittenbothk-eng.readthedocs.io/en/latest/Makecode/makecode_extensionUpdate.html)

### FAQ

#### 1: There is no reaction after pressing the buttons on the Micro:bit.

· A: This is because KOI has a longer boot time than Micro:bit. When the power is turned on, Micro:bit has already ran the code for KOI initialization before KOI is ready.

· Solution: Reset your Micro:bit after KOI has been turned on. (The trick is to let KOI power on completely before initialization.)

#### 2: Does KOI work with 3V input?

· A: No, KOI only works with 5V.

#### 3: KOI shows “Pic not has face” after taking a picture.

· A: This is normal because the focus may be off, try taking the picture again.

#### 3: KOI shows “Get timeout” after taking a picture.

· A: This is because network conditions may not be good enough, or sometimes the server may be too busy.<br>