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| from typing import List, Tuple, Union | |
| import cv2 | |
| import numpy as np | |
| from config import ModelType | |
| from numpy import ndarray | |
| class Preprocess: | |
| def __init__(self, model_type: ModelType): | |
| if model_type in (ModelType.YOLOV5, ModelType.YOLOV6, ModelType.YOLOV7, | |
| ModelType.YOLOV8): | |
| mean = np.array([0, 0, 0], dtype=np.float32) | |
| std = np.array([255, 255, 255], dtype=np.float32) | |
| is_rgb = True | |
| elif model_type == ModelType.YOLOX: | |
| mean = np.array([0, 0, 0], dtype=np.float32) | |
| std = np.array([1, 1, 1], dtype=np.float32) | |
| is_rgb = False | |
| elif model_type == ModelType.PPYOLOE: | |
| mean = np.array([123.675, 116.28, 103.53], dtype=np.float32) | |
| std = np.array([58.395, 57.12, 57.375], dtype=np.float32) | |
| is_rgb = True | |
| elif model_type == ModelType.PPYOLOEP: | |
| mean = np.array([0, 0, 0], dtype=np.float32) | |
| std = np.array([255, 255, 255], dtype=np.float32) | |
| is_rgb = True | |
| elif model_type == ModelType.RTMDET: | |
| mean = np.array([103.53, 116.28, 123.675], dtype=np.float32) | |
| std = np.array([57.375, 57.12, 58.3955], dtype=np.float32) | |
| is_rgb = False | |
| else: | |
| raise NotImplementedError | |
| self.mean = mean.reshape((3, 1, 1)) | |
| self.std = std.reshape((3, 1, 1)) | |
| self.is_rgb = is_rgb | |
| def __call__(self, | |
| image: ndarray, | |
| new_size: Union[List[int], Tuple[int]] = (640, 640), | |
| **kwargs) -> Tuple[ndarray, Tuple[float, float]]: | |
| # new_size: (height, width) | |
| height, width = image.shape[:2] | |
| ratio_h, ratio_w = new_size[0] / height, new_size[1] / width | |
| image = cv2.resize( | |
| image, (0, 0), | |
| fx=ratio_w, | |
| fy=ratio_h, | |
| interpolation=cv2.INTER_LINEAR) | |
| image = np.ascontiguousarray(image.transpose(2, 0, 1)) | |
| image = image.astype(np.float32) | |
| image -= self.mean | |
| image /= self.std | |
| return image[np.newaxis], (ratio_w, ratio_h) | |