app.py

#!/usr/bin/env python

from __future__ import annotations

import pathlib
import math

import gradio as gr
import cv2
import mediapipe as mp
import numpy as np

mp_drawing = mp.solutions.drawing_utils
mp_drawing_styles = mp.solutions.drawing_styles
mp_pose = mp.solutions.pose

TITLE = "MediaPipe Human Pose Estimation"
DESCRIPTION = "https://google.github.io/mediapipe/"


def calculateAngle(landmark1, landmark2, landmark3):
    '''
    This function calculates angle between three different landmarks.
    Args:
        landmark1: The first landmark containing the x,y and z coordinates.
        landmark2: The second landmark containing the x,y and z coordinates.
        landmark3: The third landmark containing the x,y and z coordinates.
    Returns:
        angle: The calculated angle between the three landmarks.

    '''

    # Get the required landmarks coordinates.
    x1, y1 = landmark1.x, landmark1.y
    x2, y2 = landmark2.x, landmark2.y
    x3, y3 = landmark3.x, landmark3.y

       # Calculate the angle between the three points
    angle = math.degrees(math.atan2(y3 - y2, x3 - x2) - math.atan2(y1 - y2, x1 - x2))
   # angle = abs(angle) # Convert the angle to an absolute value.


    # Check if the angle is less than zero.
    if angle < 0:

        # Add 360 to the found angle.
        angle += 360

    # Return the calculated angle.
    return angle

def classifyPose(landmarks, output_image, display=False):
    '''
    This function classifies yoga poses depending upon the angles of various body joints.
    Args:
        landmarks: A list of detected landmarks of the person whose pose needs to be classified.
        output_image: A image of the person with the detected pose landmarks drawn.
        display: A boolean value that is if set to true the function displays the resultant image with the pose label
        written on it and returns nothing.
    Returns:
        output_image: The image with the detected pose landmarks drawn and pose label written.
        label: The classified pose label of the person in the output_image.

    '''

    # Initialize the label of the pose. It is not known at this stage.
    label = 'Unknown Pose'

    # Specify the color (Red) with which the label will be written on the image.
    color = (0, 0, 255)

    # Calculate the required angles.
    #----------------------------------------------------------------------------------------------------------------

    # Get the angle between the left shoulder, elbow and wrist points.
    left_elbow_angle = calculateAngle(landmarks[mp_pose.PoseLandmark.LEFT_SHOULDER.value],
                                      landmarks[mp_pose.PoseLandmark.LEFT_ELBOW.value],
                                      landmarks[mp_pose.PoseLandmark.LEFT_WRIST.value])

    # Get the angle between the right shoulder, elbow and wrist points.
    right_elbow_angle = calculateAngle(landmarks[mp_pose.PoseLandmark.RIGHT_SHOULDER.value],
                                       landmarks[mp_pose.PoseLandmark.RIGHT_ELBOW.value],
                                       landmarks[mp_pose.PoseLandmark.RIGHT_WRIST.value])

    # Get the angle between the left elbow, shoulder and hip points.
    left_shoulder_angle = calculateAngle(landmarks[mp_pose.PoseLandmark.LEFT_ELBOW.value],
                                         landmarks[mp_pose.PoseLandmark.LEFT_SHOULDER.value],
                                         landmarks[mp_pose.PoseLandmark.LEFT_HIP.value])

    # Get the angle between the right hip, shoulder and elbow points.
    right_shoulder_angle = calculateAngle(landmarks[mp_pose.PoseLandmark.RIGHT_HIP.value],
                                          landmarks[mp_pose.PoseLandmark.RIGHT_SHOULDER.value],
                                          landmarks[mp_pose.PoseLandmark.RIGHT_ELBOW.value])

    # Get the angle between the left hip, knee and ankle points.
    left_knee_angle = calculateAngle(landmarks[mp_pose.PoseLandmark.LEFT_HIP.value],
                                     landmarks[mp_pose.PoseLandmark.LEFT_KNEE.value],
                                     landmarks[mp_pose.PoseLandmark.LEFT_ANKLE.value])

    # Get the angle between the right hip, knee and ankle points
    right_knee_angle = calculateAngle(landmarks[mp_pose.PoseLandmark.RIGHT_HIP.value],
                                      landmarks[mp_pose.PoseLandmark.RIGHT_KNEE.value],
                                      landmarks[mp_pose.PoseLandmark.RIGHT_ANKLE.value])

    #----------------------------------------------------------------------------------------------------------------
     # Check for Five-Pointed Star Pose
    if abs(landmarks[mp_pose.PoseLandmark.LEFT_WRIST.value].y - landmarks[mp_pose.PoseLandmark.LEFT_HIP.value].y) < 100 and \
       abs(landmarks[mp_pose.PoseLandmark.RIGHT_WRIST.value].y - landmarks[mp_pose.PoseLandmark.RIGHT_HIP.value].y) < 100 and \
       abs(landmarks[mp_pose.PoseLandmark.LEFT_ANKLE.value].x - landmarks[mp_pose.PoseLandmark.RIGHT_ANKLE.value].x) > 200 and \
       abs(landmarks[mp_pose.PoseLandmark.LEFT_WRIST.value].x - landmarks[mp_pose.PoseLandmark.RIGHT_WRIST.value].x) > 200:
        label = "Five-Pointed Star Pose"  
    
    # Check if it is the warrior II pose or the T pose.
    if left_elbow_angle > 165 and left_elbow_angle < 195 and right_elbow_angle > 165 and right_elbow_angle < 195:
        if left_shoulder_angle > 80 and left_shoulder_angle < 110 and right_shoulder_angle > 80 and right_shoulder_angle < 110:
            if left_knee_angle > 165 and left_knee_angle < 195 or right_knee_angle > 165 and right_knee_angle < 195:
                if left_knee_angle > 90 and left_knee_angle < 120 or right_knee_angle > 90 and right_knee_angle < 120:
                    label = 'Warrior II Pose'
            if left_knee_angle > 160 and left_knee_angle < 195 and right_knee_angle > 160 and right_knee_angle < 195:
                label = 'T Pose'
    
    # Check if it is the tree pose.
    if left_knee_angle > 165 and left_knee_angle < 195 or right_knee_angle > 165 and right_knee_angle < 195:
        if left_knee_angle > 315 and left_knee_angle < 335 or right_knee_angle > 25 and right_knee_angle < 45:
            label = 'Tree Pose'

    # Check for Upward Salute Pose
    if abs(landmarks[mp_pose.PoseLandmark.LEFT_WRIST.value].x - landmarks[mp_pose.PoseLandmark.LEFT_HIP.value].x) < 100 and \
       abs(landmarks[mp_pose.PoseLandmark.RIGHT_WRIST.value].x - landmarks[mp_pose.PoseLandmark.RIGHT_HIP.value].x) < 100 and \
       landmarks[mp_pose.PoseLandmark.LEFT_WRIST.value].y < landmarks[mp_pose.PoseLandmark.LEFT_SHOULDER.value].y and \
       landmarks[mp_pose.PoseLandmark.RIGHT_WRIST.value].y < landmarks[mp_pose.PoseLandmark.RIGHT_SHOULDER.value].y and \
       abs(landmarks[mp_pose.PoseLandmark.LEFT_SHOULDER.value].y - landmarks[mp_pose.PoseLandmark.RIGHT_SHOULDER.value].y) < 50:
        label = "Upward Salute Pose"

    # Check for Hands Under Feet Pose
    if landmarks[mp_pose.PoseLandmark.LEFT_WRIST.value].y > landmarks[mp_pose.PoseLandmark.LEFT_KNEE.value].y and \
       landmarks[mp_pose.PoseLandmark.RIGHT_WRIST.value].y > landmarks[mp_pose.PoseLandmark.RIGHT_KNEE.value].y and \
       abs(landmarks[mp_pose.PoseLandmark.LEFT_WRIST.value].x - landmarks[mp_pose.PoseLandmark.LEFT_ANKLE.value].x) < 50 and \
       abs(landmarks[mp_pose.PoseLandmark.RIGHT_WRIST.value].x - landmarks[mp_pose.PoseLandmark.RIGHT_ANKLE.value].x) < 50:
        label = "Hands Under Feet Pose"       
        
       
    #----------------------------------------------------------------------------------------------------------------

    # Check if the pose is classified successfully
    if label != 'Unknown Pose':

        # Update the color (to green) with which the label will be written on the image.
        color = (0, 255, 0)

    # Write the label on the output image.
    cv2.putText(output_image, label, (220, 30),cv2.FONT_HERSHEY_PLAIN, 2, color, 2)

    # Check if the resultant image is specified to be displayed.
    if display:

        # Display the resultant image.
        plt.figure(figsize=[10,10])
        plt.imshow(output_image[:,:,::-1]);plt.title("Output Image");plt.axis('off');

    else:

        # Return the output image and the classified label.
        return output_image, label


def run(
    image: np.ndarray,
    model_complexity: int,
    enable_segmentation: bool,
    min_detection_confidence: float,
    background_color: str,
) -> np.ndarray:
    with mp_pose.Pose(
        static_image_mode=True,
        model_complexity=model_complexity,
        enable_segmentation=enable_segmentation,
        min_detection_confidence=min_detection_confidence,
    ) as pose:
        results = pose.process(image)

    res = image[:, :, ::-1].copy()
    if enable_segmentation:
        if background_color == "white":
            bg_color = 255
        elif background_color == "black":
            bg_color = 0
        elif background_color == "green":
            bg_color = (0, 255, 0)  # type: ignore
        else:
            raise ValueError

        if results.segmentation_mask is not None:
            res[results.segmentation_mask <= 0.1] = bg_color
        else:
            res[:] = bg_color

    mp_drawing.draw_landmarks(
        res,
        results.pose_landmarks,
        mp_pose.POSE_CONNECTIONS,
        landmark_drawing_spec=mp_drawing_styles.get_default_pose_landmarks_style(),
    )

    if results.pose_landmarks:
        res, pose_classification = classifyPose(results.pose_landmarks.landmark, res) #Pose Classification code

    return res[:, :, ::-1]


model_complexities = list(range(3))
background_colors = ["white", "black", "green"]

image_paths = sorted(pathlib.Path("images").rglob("*.jpg"))
examples = [[path, model_complexities[1], True, 0.5, background_colors[0]] for path in image_paths]

demo = gr.Interface(
    fn=run,
    inputs=[
        gr.Image(label="Input", type="numpy"),
        gr.Radio(label="Model Complexity", choices=model_complexities, type="index", value=model_complexities[1]),
        gr.Checkbox(label="Enable Segmentation", value=True),
        gr.Slider(label="Minimum Detection Confidence", minimum=0, maximum=1, step=0.05, value=0.5),
        gr.Radio(label="Background Color", choices=background_colors, type="value", value=background_colors[0]),
    ],
    outputs=gr.Image(label="Output"),
    examples=examples,
    title=TITLE,
    description=DESCRIPTION,
 )

if __name__ == "__main__":
    demo.queue().launch()