| """ | |
| File: face_utils.py | |
| Author: Elena Ryumina and Dmitry Ryumin | |
| Description: This module contains utility functions related to facial landmarks and image processing. | |
| License: MIT License | |
| """ | |
| import numpy as np | |
| import math | |
| import cv2 | |
| def norm_coordinates(normalized_x, normalized_y, image_width, image_height): | |
| x_px = min(math.floor(normalized_x * image_width), image_width - 1) | |
| y_px = min(math.floor(normalized_y * image_height), image_height - 1) | |
| return x_px, y_px | |
| def get_box(fl, w, h): | |
| idx_to_coors = {} | |
| for idx, landmark in enumerate(fl.landmark): | |
| landmark_px = norm_coordinates(landmark.x, landmark.y, w, h) | |
| if landmark_px: | |
| idx_to_coors[idx] = landmark_px | |
| x_min = np.min(np.asarray(list(idx_to_coors.values()))[:, 0]) | |
| y_min = np.min(np.asarray(list(idx_to_coors.values()))[:, 1]) | |
| endX = np.max(np.asarray(list(idx_to_coors.values()))[:, 0]) | |
| endY = np.max(np.asarray(list(idx_to_coors.values()))[:, 1]) | |
| (startX, startY) = (max(0, x_min), max(0, y_min)) | |
| (endX, endY) = (min(w - 1, endX), min(h - 1, endY)) | |
| return startX, startY, endX, endY | |
| def display_info(img, text, margin=1.0, box_scale=1.0): | |
| img_copy = img.copy() | |
| img_h, img_w, _ = img_copy.shape | |
| line_width = int(min(img_h, img_w) * 0.001) | |
| thickness = max(int(line_width / 3), 1) | |
| font_face = cv2.FONT_HERSHEY_SIMPLEX | |
| font_color = (0, 0, 0) | |
| font_scale = thickness / 1.5 | |
| t_w, t_h = cv2.getTextSize(text, font_face, font_scale, None)[0] | |
| margin_n = int(t_h * margin) | |
| sub_img = img_copy[0 + margin_n: 0 + margin_n + t_h + int(2 * t_h * box_scale), | |
| img_w - t_w - margin_n - int(2 * t_h * box_scale): img_w - margin_n] | |
| white_rect = np.ones(sub_img.shape, dtype=np.uint8) * 255 | |
| img_copy[0 + margin_n: 0 + margin_n + t_h + int(2 * t_h * box_scale), | |
| img_w - t_w - margin_n - int(2 * t_h * box_scale):img_w - margin_n] = cv2.addWeighted(sub_img, 0.5, white_rect, .5, 1.0) | |
| cv2.putText(img=img_copy, | |
| text=text, | |
| org=(img_w - t_w - margin_n - int(2 * t_h * box_scale) // 2, | |
| 0 + margin_n + t_h + int(2 * t_h * box_scale) // 2), | |
| fontFace=font_face, | |
| fontScale=font_scale, | |
| color=font_color, | |
| thickness=thickness, | |
| lineType=cv2.LINE_AA, | |
| bottomLeftOrigin=False) | |
| return img_copy | |