# API Reference

### init\_sdk

{% code overflow="wrap" %}

```python
def init_sdk() -> int:
```

{% endcode %}

<table data-header-hidden><thead><tr><th width="137"></th><th></th></tr></thead><tbody><tr><td><strong>Name</strong></td><td>init_sdk</td></tr><tr><td><strong>Description</strong></td><td>Initializes the SDK.</td></tr><tr><td><strong>Input</strong></td><td>None</td></tr><tr><td><strong>Output</strong></td><td><p>Status code indicating the result of the initialization.</p><ul><li>0: Success</li><li>Non-zero: Initialization failed</li></ul></td></tr></tbody></table>

### get\_attribute

{% code overflow="wrap" %}

```python
def get_attribute(image: np.ndarray, width: int, height: int, face_results: ctypes.POINTER(FaceResult), max_face_num: int, mode: int) -> int:
```

{% endcode %}

<table data-header-hidden><thead><tr><th width="137"></th><th></th></tr></thead><tbody><tr><td><strong>Name</strong></td><td>get_attribute</td></tr><tr><td><strong>Description</strong></td><td>Detects and analyzes face.</td></tr><tr><td><strong>Input</strong></td><td><ul><li><strong>image</strong> (numpy.ndarray): Input image matrix</li><li><strong>width</strong> (int): Width of the input image</li><li><strong>height</strong> (int): Height of the input image</li><li><strong>face_results</strong> (ctypes.POINTER): Pointer to a structure containing face results</li><li><strong>max_face_num</strong> (int): Maximum number of faces to detect</li><li><strong>mode</strong> (int): 0-> Enroll mode, 1-> Identify mode</li></ul></td></tr><tr><td><strong>Output</strong></td><td><p>Status code indicating the result of getting attribute.</p><ul><li>>0: Number of detected faces</li><li>0: No Face</li><li>otherwise: Error</li></ul></td></tr></tbody></table>

Here is **`FaceResult`** Structure.

```python
class FaceResult(Structure):
    _fields_ = [
        ("x1", c_int32),
        ("y1", c_int32),
        ("x2", c_int32),
        ("y2", c_int32),
        ("liveness", c_int32),
        ("mask", c_int32),
        ("glass", c_int32),
        ("age", c_int32),
        ("gender", c_int32),
        ("feature", c_ubyte * 2056)
    ]
```

<table data-header-hidden><thead><tr><th width="226"></th><th></th></tr></thead><tbody><tr><td><strong>(x1, y1)</strong></td><td>Coordinate of the top-left corner of the bounding box of the detected face.</td></tr><tr><td><strong>(x2, y2)</strong></td><td>Coordinate of the bottom-right corner of the bounding box of the detected face.</td></tr><tr><td><strong>liveness</strong></td><td><p>Liveness score of detected face</p><ul><li>0 -> SPOOF</li><li>1 -> REAL</li><li>-3 -> TOO SMALL FACE</li><li>-4 -> TOO LARGE FACE</li><li>-102 -> NO FACE</li><li>-103 -> LIVENESS CHECK FAILED</li></ul></td></tr><tr><td><strong>mask</strong></td><td><p>Mask detection of the detected face</p><ul><li>0 -> No, 1 -> Yes</li></ul></td></tr><tr><td><strong>glass</strong></td><td><p>Glass detection of the detected face</p><ul><li>0 -> No, 1 -> Yes</li></ul></td></tr><tr><td><strong>age</strong></td><td>Estimated age of the detected face</td></tr><tr><td><strong>gender</strong></td><td><p>Gender prediction of the detected face</p><ul><li>0 -> Male, 1 -> Female</li></ul></td></tr><tr><td><strong>feature</strong></td><td>Template buffer. Extracted template will be stored</td></tr></tbody></table>

### calculate\_similarity

{% code overflow="wrap" %}

```python
def calculate_similarity(feature_1: np.ndarray, feature_2: np.ndarray) -> float:
```

{% endcode %}

<table data-header-hidden><thead><tr><th width="137"></th><th></th></tr></thead><tbody><tr><td><strong>Name</strong></td><td>calculate_similarity</td></tr><tr><td><strong>Description</strong></td><td>Calculates the similarity between two features</td></tr><tr><td><strong>Input</strong></td><td><ul><li><strong>feature_1</strong> (numpy.ndarray): 1st feature</li><li><strong>feature_2</strong> (numpy.ndarray): 2nd feature</li></ul></td></tr><tr><td><strong>Output</strong></td><td><p>Similarity score between the two features</p><p>The score ranges from 0.0 to 1.0<br><strong>Default Threshold is 0.82</strong></p></td></tr></tbody></table>


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