Real-Time Emotion Detection OpenCV Python With Source Code

Real-Time Emotion Detection OpenCV Python With Source Code

The Real-Time Emotion Detection OpenCV Python was developed using Python OpenCV, Emotion Detection or Facial Expression Classification is a widely researched topic in today’s Deep Learning arena.

To classify your emotions in real-time using just your camera and some lines of code is actually a big step towards Advanced Human-Computer interaction.

An Emotion Detection OpenCV Python Detecting the real-time emotion of the person with a camera input is one of the advanced features in the machine learning process.

The detection of the emotion of a person using a camera is useful for various research and analytics purposes.

The detection of emotion is made by using the machine learning concept. You can use the trained dataset to detect the emotion of the human being.

For detecting the different emotions, first, you need to train those different emotions, or you can use a dataset already available on the internet.

In this article, we will discuss creating a Python program to detect the real-time emotion of a human being using the camera.

This Python OpenCV Project also includes a downloadable Python Project With Source Code for free, just find the downloadable source code below and click to start downloading.

By the way, if you are new to Python programming and don’t know how to use the Python IDE, I have here a list of the Best Python IDE for Windows, Linux, and Mac OS that will suit you. I also have here How to Download and Install the Latest Version of Python on Windows.

To start executing Real-Time Emotion Detection OpenCV Python With Source Code, make sure that you have installed Python 3.9 and PyCharm on your computer.

Real-Time Emotion Detection OpenCV Python With Source Code: Steps on how to run the project

Installed Libraries

import cv2.cv2 as cv2
import numpy as np

Complete Source Code

import cv2.cv2 as cv2
import numpy as np

from utils.image_classifier import ImageClassifier, NO_FACE_LABEL

# Color RGB Codes & Font
WHITE_COLOR = (255, 255, 255)
GREEN_COLOR = (0, 255, 0)
BLUE_COLOR = (255, 255, 104)
FONT = cv2.QT_FONT_NORMAL

# Frame Width & Height
FRAME_WIDTH = 640
FRAME_HEIGHT = 490


class BoundingBox:
    def __init__(self, x, y, w, h):
        self.x = x
        self.y = y
        self.w = w
        self.h = h

    @property
    def origin(self) -> tuple:
        return self.x, self.y

    @property
    def top_right(self) -> int:
        return self.x + self.w

    @property
    def bottom_left(self) -> int:
        return self.y + self.h


def draw_face_rectangle(bb: BoundingBox, img, color=BLUE_COLOR):
    cv2.rectangle(img, bb.origin, (bb.top_right, bb.bottom_left), color, 2)


def draw_landmark_points(points: np.ndarray, img, color=WHITE_COLOR):
    if points is None:
        return None
    for (x, y) in points:
        cv2.circle(img, (x, y), 1, color, -1)


def write_label(x: int, y: int, label: str, img, color=BLUE_COLOR):
    if label == NO_FACE_LABEL:
        cv2.putText(img, label.upper(), (int(FRAME_WIDTH / 2), int(FRAME_HEIGHT / 2)), FONT, 1, color, 2, cv2.LINE_AA)
    cv2.putText(img, label, (x + 10, y - 10), FONT, 1, color, 2, cv2.LINE_AA)


class RealTimeEmotionDetector:
    CLAHE = cv2.createCLAHE(clipLimit=2.0, tileGridSize=(8, 8))

    vidCapture = None

    def __init__(self, classifier_model: ImageClassifier):
        self.__init_video_capture(camera_idx=0, frame_w=FRAME_WIDTH, frame_h=FRAME_HEIGHT)
        self.classifier = classifier_model

    def __init_video_capture(self, camera_idx: int, frame_w: int, frame_h: int):
        self.vidCapture = cv2.VideoCapture(camera_idx)
        self.vidCapture.set(cv2.CAP_PROP_FRAME_WIDTH, frame_w)
        self.vidCapture.set(cv2.CAP_PROP_FRAME_HEIGHT, frame_h)

    def read_frame(self) -> np.ndarray:
        rect, frame = self.vidCapture.read()
        return frame

    def transform_img(self, img: np.ndarray) -> np.ndarray:
        # load the input image, resize it, and convert it to gray-scale
        gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)  # convert to gray-scale
        resized_img = self.CLAHE.apply(gray_img)  # resize
        return resized_img

    def execute(self, wait_key_delay=33, quit_key='q', frame_period_s=0.75):
        frame_cnt = 0
        predicted_labels = ''
        old_txt = None
        rectangles = [(0, 0, 0, 0)]
        landmark_points_list = [[(0, 0)]]
        while cv2.waitKey(delay=wait_key_delay) != ord(quit_key):
            frame_cnt += 1

            frame = self.read_frame()
            if frame_cnt % (frame_period_s * 100) == 0:
                frame_cnt = 0
                predicted_labels = self.classifier.classify(img=self.transform_img(img=frame))
                rectangles = self.classifier.extract_face_rectangle(img=frame)
                landmark_points_list = self.classifier.extract_landmark_points(img=frame)
            for lbl, rectangle, lm_points in zip(predicted_labels, rectangles, landmark_points_list):
                draw_face_rectangle(BoundingBox(*rectangle), frame)
                draw_landmark_points(points=lm_points, img=frame)
                write_label(rectangle[0], rectangle[1], label=lbl, img=frame)

                if old_txt != predicted_labels:
                    print('[INFO] Predicted Labels:', predicted_labels)
                    old_txt = predicted_labels

            cv2.imshow('Emotion Detection - Mimics', frame)

        cv2.destroyAllWindows()
        self.vidCapture.release()


def run_real_time_emotion_detector(
        classifier_algorithm: str,
        predictor_path: str,
        dataset_csv: str,
        dataset_images_dir: str = None):
    from utils.data_land_marker import LandMarker
    from utils.image_classifier import ImageClassifier
    from os.path import isfile

    land_marker = LandMarker(landmark_predictor_path=predictor_path)

    if not isfile(dataset_csv):  # If data-set not built before.
        print('[INFO]', f'Dataset file: "{dataset_csv}" could not found.')
        from data_preparer import run_data_preparer
        run_data_preparer(land_marker, dataset_images_dir, dataset_csv)
    else:
        print('[INFO]', f'Dataset file: "{dataset_csv}" found.')

    classifier = ImageClassifier(csv_path=dataset_csv, algorithm=classifier_algorithm, land_marker=land_marker)
    print('[INFO] Opening camera, press "q" to exit..')
    RealTimeEmotionDetector(classifier_model=classifier).execute()


if __name__ == "__main__":
    """The value of the parameters can change depending on the case."""
    run_real_time_emotion_detector(
        classifier_algorithm='RandomForest',  # Alternatively 'SVM'.
        predictor_path='utils/shape_predictor_68_face_landmarks.dat',
        dataset_csv='data/csv/dataset.csv',
        dataset_images_dir='data/raw'
    )
    print('Successfully terminated.')

Output:

Download the Source Code below

Summary

Detecting the real-time emotion of the person with a camera input is one of the advanced features in the machine learning process.

The detection of the emotion of a person using a camera is useful for various research and analytics purposes.

The detection of emotion is made by using the machine learning concept. You can use the trained dataset to detect the emotion of the human being.

For detecting the different emotions, first, you need to train those different emotions, or you can use a dataset already available on the internet.

In this article, we will discuss creating a Python program to detect the real-time emotion of a human being using the camera.

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Inquiries

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Angel Jude Suarez

Full-Stack Developer at PIES IT Solution

Focuses on Python development, machine learning, and AI integration. Has built production AI systems including OpenAI Whisper integration for medical transcription and GPT-4o-powered diagnosis assistance. Strong background in pandas, scikit-learn, and TensorFlow.

Expertise: Python · PHP · Java · VB.NET · ASP.NET · Machine Learning · AI Integration · OpenCV · Django · CodeIgniter  · View all posts by Angel Jude Suarez →