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core.py
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"""
Deepstack core.
"""
import requests
from PIL import Image
from typing import Union, List, Set, Dict
## Const
HTTP_OK = 200
DEFAULT_TIMEOUT = 10 # seconds
## API urls
URL_OBJECT_DETECTION = "http://{}:{}/v1/vision/detection"
URL_FACE_DETECTION = "http://{}:{}/v1/vision/face"
URL_FACE_REGISTRATION = "http://{}:{}/v1/vision/face/register"
URL_FACE_RECOGNITION = "http://{}:{}/v1/vision/face/recognize"
def format_confidence(confidence: Union[str, float]) -> float:
"""Takes a confidence from the API like
0.55623 and returne 55.6 (%).
"""
return round(float(confidence) * 100, 1)
def get_confidences_above_threshold(
confidences: List[float], confidence_threshold: float
) -> List[float]:
"""Takes a list of confidences and returns those above a confidence_threshold."""
return [val for val in confidences if val >= confidence_threshold]
def get_recognised_faces(predictions: List[Dict]) -> List[Dict]:
"""
Get the recognised faces.
"""
try:
matched_faces = {
face["userid"]: round(face["confidence"] * 100, 1)
for face in predictions
if not face["userid"] == "unknown"
}
return matched_faces
except:
return {}
def get_objects(predictions: List[Dict]) -> List[str]:
"""
Get a list of the unique objects predicted.
"""
labels = [pred["label"] for pred in predictions]
return list(set(labels))
def get_object_confidences(predictions: List[Dict], target_object: str):
"""
Return the list of confidences of instances of target label.
"""
confidences = [
pred["confidence"] for pred in predictions if pred["label"] == target_object
]
return confidences
def get_objects_summary(predictions: List[Dict]):
"""
Get a summary of the objects detected.
"""
objects = get_objects(predictions)
return {
target_object: len(get_object_confidences(predictions, target_object))
for target_object in objects
}
def post_image(
url: str, image_bytes: bytes, api_key: str, timeout: int, data: dict = {}
):
"""Post an image to Deepstack."""
try:
data["api_key"] = api_key
response = requests.post(
url, files={"image": image_bytes}, data=data, timeout=timeout
)
return response
except requests.exceptions.Timeout:
raise DeepstackException(
f"Timeout connecting to Deepstack, current timeout is {timeout} seconds"
)
except requests.exceptions.ConnectionError as exc:
raise DeepstackException(f"Connection error: {exc}")
class DeepstackException(Exception):
pass
class Deepstack(object):
"""Base class for deepstack."""
def __init__(
self,
ip_address: str,
port: str,
api_key: str = "",
timeout: int = DEFAULT_TIMEOUT,
url_detection: str = "",
):
self._ip_address = ip_address
self._port = port
self._url_detection = url_detection
self._api_key = api_key
self._timeout = timeout
self._predictions = []
def detect(self, image_bytes: bytes):
"""Process image_bytes, performing detection."""
self._predictions = []
url = self._url_detection.format(self._ip_address, self._port)
response = post_image(url, image_bytes, self._api_key, self._timeout)
if response.status_code == HTTP_OK:
if response.json()["success"]:
self._predictions = response.json()["predictions"]
else:
error = response.json()["error"]
raise DeepstackException(f"Error from Deepstack: {error}")
@property
def predictions(self):
"""Return the classifier attributes."""
return self._predictions
class DeepstackObject(Deepstack):
"""Work with objects"""
def __init__(
self,
ip_address: str,
port: str,
api_key: str = "",
timeout: int = DEFAULT_TIMEOUT,
):
super().__init__(
ip_address, port, api_key, timeout, url_detection=URL_OBJECT_DETECTION
)
class DeepstackFace(Deepstack):
"""Work with objects"""
def __init__(
self,
ip_address: str,
port: str,
api_key: str = "",
timeout: int = DEFAULT_TIMEOUT,
):
super().__init__(
ip_address, port, api_key, timeout, url_detection=URL_FACE_DETECTION
)
def register_face(self, name: str, image_bytes: bytes):
"""
Register a face name to a file.
"""
response = post_image(
url=URL_FACE_REGISTRATION.format(self._ip_address, self._port),
image_bytes=image_bytes,
api_key=self._api_key,
timeout=self._timeout,
data={"userid": name},
)
if response.status_code == 200 and response.json()["success"] == True:
return
elif response.status_code == 200 and response.json()["success"] == False:
error = response.json()["error"]
raise DeepstackException(f"Error from Deepstack: {error}")
def recognise(self, image_bytes: bytes):
"""Process image_bytes, performing recognition."""
self._predictions = []
url = URL_FACE_RECOGNITION.format(self._ip_address, self._port)
response = post_image(url, image_bytes, self._api_key, self._timeout)
if response.status_code == HTTP_OK:
if response.json()["success"]:
self._predictions = response.json()["predictions"]
else:
error = response.json()["error"]
raise DeepstackException(f"Error from Deepstack: {error}")