OpenCV face detect examples

snipplets/code/Python/opencv/.gitignore

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+*.png
+haarcascade_frontalface_default.xml

snipplets/code/Python/opencv/capture-image.py

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+#!/usr/bin/env python3
+
+import cv2
+
+cam_port = 2
+cam = cv2.VideoCapture(cam_port)
+
+while True:
+    result, image = cam.read()
+
+    cv2.imshow('Camera', image)
+
+    if cv2.waitKey(1) & 0xFF == ord('s'):
+        cv2.imwrite('capture.png', image)
+
+    if cv2.waitKey(1) & 0xFF == ord('q'):
+        break
+
+cam.release()
+cv2.destroyWindow('Camera')
+cv2.destroyAllWindows()

snipplets/code/Python/opencv/face-detect-realtime.py

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+#!/usr/bin/env python3
+
+import cv2
+
+camera = cv2.VideoCapture(2)
+
+while True:
+    if cv2.waitKey(1) & 0xFF == ord('q'):
+        break
+
+    result, image = camera.read()
+
+    gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
+
+    face_classifier = cv2.CascadeClassifier(
+        cv2.data.haarcascades + 'haarcascade_frontalface_default.xml'
+    )
+
+    face = face_classifier.detectMultiScale(
+        gray_image, scaleFactor=1.1, minNeighbors=5, minSize=(40, 40)
+    )
+
+    for x, y, w, h in face:
+        cv2.rectangle(image, (x, y), (x + w, y + h), (0, 255, 0), 2)
+
+    cv2.imshow('Face Realtime Detector', image)
+
+camera.release()
+cv2.destroyAllWindows()

snipplets/code/Python/opencv/face-detect.py

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+#!/usr/bin/env python3
+
+import cv2
+
+img = cv2.imread('face.png')
+
+gray_image = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+
+face_classifier = cv2.CascadeClassifier(
+    cv2.data.haarcascades + 'haarcascade_frontalface_default.xml'
+)
+
+face = face_classifier.detectMultiScale(
+    gray_image, scaleFactor=1.1, minNeighbors=5, minSize=(40, 40)
+)
+
+for x, y, w, h in face:
+    cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2)
+
+img_rgb = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
+
+cv2.imshow('Face Detector', img_rgb)
+cv2.waitKey(0)
+cv2.destroyAllWindows()

snipplets/code/Python/opencv/open-image.py

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+import cv2
+
+img = cv2.imread('image.png')
+
+cv2.imshow('Images from Files', img)
+cv2.waitKey(0)
+cv2.destroyAllWindows()

snipplets/code/Python/opencv/pyproject.toml

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+[tool.black]
+skip-string-normalization = true
+pycodestyle = true
+line-length = 100

snipplets/code/Python/opencv/requirements.txt

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+numpy==1.25.2
+opencv-python==4.8.0.76