src/utils/draw_utils.py

import cv2
import mediapipe as mp
import numpy as np
from mediapipe.framework.formats import landmark_pb2

class FaceMeshVisualizer:
    def __init__(self, 
            forehead_edge=False, 
            upface_only=False, 
            draw_eye=True,
            draw_head=False,
            draw_iris=True,
            draw_eyebrow=True,
            draw_mouse=True,
            draw_nose=True,
            draw_pupil=True
        ):
        self.mp_drawing = mp.solutions.drawing_utils
        mp_face_mesh = mp.solutions.face_mesh
        self.mp_face_mesh = mp_face_mesh
        self.forehead_edge = forehead_edge

        DrawingSpec = mp.solutions.drawing_styles.DrawingSpec
        f_thick = 2
        f_rad = 1
        right_iris_draw = DrawingSpec(color=(10, 200, 250), thickness=f_thick, circle_radius=f_rad)
        right_eye_draw = DrawingSpec(color=(10, 200, 180), thickness=f_thick, circle_radius=f_rad)
        right_eyebrow_draw = DrawingSpec(color=(10, 220, 180), thickness=f_thick, circle_radius=f_rad)
        left_iris_draw = DrawingSpec(color=(250, 200, 10), thickness=f_thick, circle_radius=f_rad)
        left_eye_draw = DrawingSpec(color=(180, 200, 10), thickness=f_thick, circle_radius=f_rad)
        left_eyebrow_draw = DrawingSpec(color=(180, 220, 10), thickness=f_thick, circle_radius=f_rad)
        head_draw = DrawingSpec(color=(10, 200, 10), thickness=f_thick, circle_radius=f_rad)
        nose_draw = DrawingSpec(color=(200, 200, 200), thickness=f_thick, circle_radius=f_rad)
        
        mouth_draw_obl = DrawingSpec(color=(10, 180, 20), thickness=f_thick, circle_radius=f_rad)
        mouth_draw_obr = DrawingSpec(color=(20, 10, 180), thickness=f_thick, circle_radius=f_rad)
        
        mouth_draw_ibl = DrawingSpec(color=(100, 100, 30), thickness=f_thick, circle_radius=f_rad)
        mouth_draw_ibr = DrawingSpec(color=(100, 150, 50), thickness=f_thick, circle_radius=f_rad)
        
        mouth_draw_otl = DrawingSpec(color=(20, 80, 100), thickness=f_thick, circle_radius=f_rad)
        mouth_draw_otr = DrawingSpec(color=(80, 100, 20), thickness=f_thick, circle_radius=f_rad)
        
        mouth_draw_itl = DrawingSpec(color=(120, 100, 200), thickness=f_thick, circle_radius=f_rad)
        mouth_draw_itr = DrawingSpec(color=(150 ,120, 100), thickness=f_thick, circle_radius=f_rad)
        
        FACEMESH_LIPS_OUTER_BOTTOM_LEFT = [(61,146),(146,91),(91,181),(181,84),(84,17)]
        FACEMESH_LIPS_OUTER_BOTTOM_RIGHT = [(17,314),(314,405),(405,321),(321,375),(375,291)]
        
        FACEMESH_LIPS_INNER_BOTTOM_LEFT = [(78,95),(95,88),(88,178),(178,87),(87,14)]
        FACEMESH_LIPS_INNER_BOTTOM_RIGHT = [(14,317),(317,402),(402,318),(318,324),(324,308)]
        
        FACEMESH_LIPS_OUTER_TOP_LEFT = [(61,185),(185,40),(40,39),(39,37),(37,0)]
        FACEMESH_LIPS_OUTER_TOP_RIGHT = [(0,267),(267,269),(269,270),(270,409),(409,291)]
        
        FACEMESH_LIPS_INNER_TOP_LEFT = [(78,191),(191,80),(80,81),(81,82),(82,13)]
        FACEMESH_LIPS_INNER_TOP_RIGHT = [(13,312),(312,311),(311,310),(310,415),(415,308)]
        
        FACEMESH_CUSTOM_FACE_OVAL = [(176, 149), (150, 136), (356, 454), (58, 132), (152, 148), (361, 288), (251, 389), (132, 93), (389, 356), (400, 377), (136, 172), (377, 152), (323, 361), (172, 58), (454, 323), (365, 379), (379, 378), (148, 176), (93, 234), (397, 365), (149, 150), (288, 397), (234, 127), (378, 400), (127, 162), (162, 21)]

        # mp_face_mesh.FACEMESH_CONTOURS has all the items we care about.
        face_connection_spec = {}

        #from IPython import embed
        #embed()
        if self.forehead_edge:
            for edge in mp_face_mesh.FACEMESH_FACE_OVAL:
                face_connection_spec[edge] = head_draw
        else:
            if draw_head:
                FACEMESH_CUSTOM_FACE_OVAL_sorted = sorted(FACEMESH_CUSTOM_FACE_OVAL)
                if upface_only:
                    for edge in [FACEMESH_CUSTOM_FACE_OVAL_sorted[edge_idx] for edge_idx in [1,2,9,12,13,16,22,25]]:
                        face_connection_spec[edge] = head_draw
                else:
                    for edge in FACEMESH_CUSTOM_FACE_OVAL_sorted:
                        face_connection_spec[edge] = head_draw
        
        if draw_eye:  
            for edge in mp_face_mesh.FACEMESH_LEFT_EYE:
                face_connection_spec[edge] = left_eye_draw
            for edge in mp_face_mesh.FACEMESH_RIGHT_EYE:
                face_connection_spec[edge] = right_eye_draw
        
        if draw_eyebrow:
            for edge in mp_face_mesh.FACEMESH_LEFT_EYEBROW:
                face_connection_spec[edge] = left_eyebrow_draw

            for edge in mp_face_mesh.FACEMESH_RIGHT_EYEBROW:
                face_connection_spec[edge] = right_eyebrow_draw
            
        if draw_iris:
            for edge in mp_face_mesh.FACEMESH_LEFT_IRIS:
                face_connection_spec[edge] = left_iris_draw
            for edge in mp_face_mesh.FACEMESH_RIGHT_IRIS:
                face_connection_spec[edge] = right_iris_draw
            
            #for edge in mp_face_mesh.FACEMESH_RIGHT_EYEBROW:
            #    face_connection_spec[edge] = right_eyebrow_draw
            # for edge in mp_face_mesh.FACEMESH_RIGHT_IRIS:
            #    face_connection_spec[edge] = right_iris_draw

        # for edge in mp_face_mesh.FACEMESH_LIPS:
        #     face_connection_spec[edge] = mouth_draw

        if draw_mouse:
            for edge in FACEMESH_LIPS_OUTER_BOTTOM_LEFT:
                face_connection_spec[edge] = mouth_draw_obl
            for edge in FACEMESH_LIPS_OUTER_BOTTOM_RIGHT:
                face_connection_spec[edge] = mouth_draw_obr
            for edge in FACEMESH_LIPS_INNER_BOTTOM_LEFT:
                face_connection_spec[edge] = mouth_draw_ibl
            for edge in FACEMESH_LIPS_INNER_BOTTOM_RIGHT:
                face_connection_spec[edge] = mouth_draw_ibr
            for edge in FACEMESH_LIPS_OUTER_TOP_LEFT:
                face_connection_spec[edge] = mouth_draw_otl
            for edge in FACEMESH_LIPS_OUTER_TOP_RIGHT:
                face_connection_spec[edge] = mouth_draw_otr
            for edge in FACEMESH_LIPS_INNER_TOP_LEFT:
                face_connection_spec[edge] = mouth_draw_itl
            for edge in FACEMESH_LIPS_INNER_TOP_RIGHT:
                face_connection_spec[edge] = mouth_draw_itr
        
        self.face_connection_spec = face_connection_spec
        
        self.pupil_landmark_spec = {468: right_iris_draw, 473: left_iris_draw}
        self.nose_landmark_spec = {4: nose_draw}

        self.draw_pupil = draw_pupil
        self.draw_nose = draw_nose
    
    def draw_points(self, image, landmark_list, drawing_spec, halfwidth: int = 2):
        """We have a custom function to draw the pupils because the mp.draw_landmarks method requires a parameter for all
        landmarks.  Until our PR is merged into mediapipe, we need this separate method."""
        if len(image.shape) != 3:
            raise ValueError("Input image must be H,W,C.")
        image_rows, image_cols, image_channels = image.shape
        if image_channels != 3:  # BGR channels
            raise ValueError('Input image must contain three channel bgr data.')
        for idx, landmark in enumerate(landmark_list.landmark):
            if idx not in drawing_spec:
                continue
            
            if (
                    (landmark.HasField('visibility') and landmark.visibility < 0.9) or
                    (landmark.HasField('presence') and landmark.presence < 0.5)
            ):
                continue
            if landmark.x >= 1.0 or landmark.x < 0 or landmark.y >= 1.0 or landmark.y < 0:
                continue

            image_x = int(image_cols * landmark.x)
            image_y = int(image_rows * landmark.y)
            
            draw_color = drawing_spec[idx].color
            image[image_y - halfwidth : image_y + halfwidth, image_x - halfwidth : image_x + halfwidth, :] = draw_color
        

    def draw_landmarks(self, image_size, keypoints, normed=False):
        ini_size = [512, 512]
        image = np.zeros([ini_size[1], ini_size[0], 3], dtype=np.uint8)
        if keypoints is not None:
            new_landmarks = landmark_pb2.NormalizedLandmarkList()
            for i in range(keypoints.shape[0]):
                landmark = new_landmarks.landmark.add()
                if normed:
                    landmark.x = keypoints[i, 0]
                    landmark.y = keypoints[i, 1]
                else:
                    landmark.x = keypoints[i, 0] / image_size[0]
                    landmark.y = keypoints[i, 1] / image_size[1]
                landmark.z = 1.0

            self.mp_drawing.draw_landmarks(
                image=image,
                landmark_list=new_landmarks,
                connections=self.face_connection_spec.keys(),
                landmark_drawing_spec=None,
                connection_drawing_spec=self.face_connection_spec
            )

            if self.draw_pupil:
                self.draw_points(image, new_landmarks, self.pupil_landmark_spec, 3)
            
            if self.draw_nose:
                self.draw_points(image, new_landmarks, self.nose_landmark_spec, 3)

        image = cv2.resize(image, (image_size[0], image_size[1]))
        
        return image