detect_gender.py

# author: Arun Ponnusamy
# website: https://www.arunponnusamy.com

# import necessary packages
from keras.preprocessing.image import img_to_array
from keras.models import load_model
from keras.utils import get_file
import numpy as np
import argparse
import cv2
import os
import cvlib as cv

# handle command line arguments
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", required=True,
	help="path to input image")
args = ap.parse_args()

# download pre-trained model file (one-time download)
dwnld_link = "https://github.com/arunponnusamy/cvlib/releases/download/v0.2.0/gender_detection.model"
model_path = get_file("gender_detection.model", dwnld_link,
                     cache_subdir="pre-trained", cache_dir=os.getcwd())

# read input image
image = cv2.imread(args.image)

if image is None:
    print("Could not read input image")
    exit()

# load pre-trained model
model = load_model(model_path)

# detect faces in the image
face, confidence = cv.detect_face(image)

classes = ['man','woman']

# loop through detected faces
for idx, f in enumerate(face):

     # get corner points of face rectangle       
    (startX, startY) = f[0], f[1]
    (endX, endY) = f[2], f[3]

    # draw rectangle over face
    cv2.rectangle(image, (startX,startY), (endX,endY), (0,255,0), 2)

    # crop the detected face region
    face_crop = np.copy(image[startY:endY,startX:endX])

    # preprocessing for gender detection model
    face_crop = cv2.resize(face_crop, (96,96))
    face_crop = face_crop.astype("float") / 255.0
    face_crop = img_to_array(face_crop)
    face_crop = np.expand_dims(face_crop, axis=0)

    # apply gender detection on face
    conf = model.predict(face_crop)[0]
    print(conf)
    print(classes)

    # get label with max accuracy
    idx = np.argmax(conf)
    label = classes[idx]

    label = "{}: {:.2f}%".format(label, conf[idx] * 100)

    Y = startY - 10 if startY - 10 > 10 else startY + 10

    # write label and confidence above face rectangle
    cv2.putText(image, label, (startX, Y),  cv2.FONT_HERSHEY_SIMPLEX,
                0.7, (0, 255, 0), 2)

# display output
cv2.imshow("gender detection", image)

# press any key to close window           
cv2.waitKey()

# save output
cv2.imwrite("gender_detection.jpg", image)

# release resources
cv2.destroyAllWindows()