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125 lines
4.4 KiB
125 lines
4.4 KiB
from pathlib import Path |
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from typing import List, Tuple, Union |
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import cv2 |
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import numpy as np |
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from numpy import ndarray |
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# image suffixs |
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SUFFIXS = ('.bmp', '.dng', '.jpeg', '.jpg', '.mpo', '.png', '.tif', '.tiff', |
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'.webp', '.pfm') |
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def letterbox(im: ndarray, |
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new_shape: Union[Tuple, List] = (640, 640), |
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color: Union[Tuple, List] = (114, 114, 114)) \ |
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-> Tuple[ndarray, float, Tuple[float, float]]: |
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# Resize and pad image while meeting stride-multiple constraints |
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shape = im.shape[:2] # current shape [height, width] |
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if isinstance(new_shape, int): |
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new_shape = (new_shape, new_shape) |
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# Scale ratio (new / old) |
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r = min(new_shape[0] / shape[0], new_shape[1] / shape[1]) |
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# Compute padding |
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new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r)) |
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dw, dh = new_shape[1] - new_unpad[0], new_shape[0] - new_unpad[ |
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1] # wh padding |
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dw /= 2 # divide padding into 2 sides |
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dh /= 2 |
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if shape[::-1] != new_unpad: # resize |
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im = cv2.resize(im, new_unpad, interpolation=cv2.INTER_LINEAR) |
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top, bottom = int(round(dh - 0.1)), int(round(dh + 0.1)) |
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left, right = int(round(dw - 0.1)), int(round(dw + 0.1)) |
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im = cv2.copyMakeBorder(im, |
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top, |
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bottom, |
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left, |
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right, |
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cv2.BORDER_CONSTANT, |
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value=color) # add border |
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return im, r, (dw, dh) |
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def blob(im: ndarray, return_seg: bool = False) -> Union[ndarray, Tuple]: |
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if return_seg: |
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seg = im.astype(np.float32) / 255 |
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im = im.transpose([2, 0, 1]) |
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im = im[np.newaxis, ...] |
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im = np.ascontiguousarray(im).astype(np.float32) / 255 |
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if return_seg: |
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return im, seg |
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else: |
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return im |
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def path_to_list(images_path: Union[str, Path]) -> List: |
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if isinstance(images_path, str): |
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images_path = Path(images_path) |
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assert images_path.exists() |
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if images_path.is_dir(): |
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images = [ |
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i.absolute() for i in images_path.iterdir() if i.suffix in SUFFIXS |
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] |
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else: |
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assert images_path.suffix in SUFFIXS |
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images = [images_path.absolute()] |
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return images |
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def crop_mask(masks: ndarray, bboxes: ndarray) -> ndarray: |
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n, h, w = masks.shape |
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x1, y1, x2, y2 = np.split(bboxes[:, :, None], [1, 2, 3], |
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1) # x1 shape(1,1,n) |
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r = np.arange(w, dtype=x1.dtype)[None, None, :] # rows shape(1,w,1) |
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c = np.arange(h, dtype=x1.dtype)[None, :, None] # cols shape(h,1,1) |
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return masks * ((r >= x1) * (r < x2) * (c >= y1) * (c < y2)) |
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def det_postprocess(data: Tuple[ndarray, ndarray, ndarray, ndarray]): |
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assert len(data) == 4 |
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num_dets, bboxes, scores, labels = (i[0] for i in data) |
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nums = num_dets.item() |
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bboxes = bboxes[:nums] |
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scores = scores[:nums] |
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labels = labels[:nums] |
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return bboxes, scores, labels |
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def seg_postprocess( |
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data: Tuple[ndarray], |
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shape: Union[Tuple, List], |
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conf_thres: float = 0.25, |
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iou_thres: float = 0.65) \ |
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-> Tuple[ndarray, ndarray, ndarray, ndarray]: |
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assert len(data) == 2 |
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h, w = shape[0] // 4, shape[1] // 4 # 4x downsampling |
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outputs, proto = (i[0] for i in data) |
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bboxes, scores, labels, maskconf = np.split(outputs, [4, 5, 6], 1) |
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scores, labels = scores.squeeze(), labels.squeeze() |
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idx = scores > conf_thres |
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bboxes, scores, labels, maskconf = \ |
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bboxes[idx], scores[idx], labels[idx], maskconf[idx] |
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cvbboxes = np.concatenate([bboxes[:, :2], bboxes[:, 2:] - bboxes[:, :2]], |
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1) |
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labels = labels.astype(np.int32) |
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v0, v1 = map(int, (cv2.__version__).split('.')[:2]) |
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assert v0 == 4, 'OpenCV version is wrong' |
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if v1 > 6: |
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idx = cv2.dnn.NMSBoxesBatched(cvbboxes, scores, labels, conf_thres, |
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iou_thres) |
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else: |
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idx = cv2.dnn.NMSBoxes(cvbboxes, scores, conf_thres, iou_thres) |
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bboxes, scores, labels, maskconf = \ |
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bboxes[idx], scores[idx], labels[idx], maskconf[idx] |
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masks = (maskconf @ proto).reshape(-1, h, w) |
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masks = crop_mask(masks, bboxes / 4.) |
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masks = cv2.resize(masks.transpose([1, 2, 0]), |
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shape, |
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interpolation=cv2.INTER_LINEAR).transpose(2, 0, 1) |
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masks = np.ascontiguousarray((masks > 0.5)[..., None]) |
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return bboxes, scores, labels, masks
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