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| from typing import Literal, Union | |
| def process_mmdet_results(mmdet_results: list, | |
| cat_id: int = 0, | |
| multi_person: bool = True) -> list: | |
| """Process mmdet results, sort bboxes by area in descending order. | |
| Args: | |
| mmdet_results (list): | |
| Result of mmdet.apis.inference_detector | |
| when the input is a batch. | |
| Shape of the nested lists is | |
| (n_frame, n_category, n_human, 5). | |
| cat_id (int, optional): | |
| Category ID. This function will only select | |
| the selected category, and drop the others. | |
| Defaults to 0, ID of human category. | |
| multi_person (bool, optional): | |
| Whether to allow multi-person detection, which is | |
| slower than single-person. If false, the function | |
| only assure that the first person of each frame | |
| has the biggest bbox. | |
| Defaults to True. | |
| Returns: | |
| list: | |
| A list of detected bounding boxes. | |
| Shape of the nested lists is | |
| (n_frame, n_human, 5) | |
| and each bbox is (x, y, x, y, score). | |
| """ | |
| ret_list = [] | |
| only_max_arg = not multi_person | |
| # for _, frame_results in enumerate(mmdet_results): | |
| cat_bboxes = mmdet_results[cat_id] | |
| # import pdb; pdb.set_trace() | |
| sorted_bbox = qsort_bbox_list(cat_bboxes, only_max_arg) | |
| if only_max_arg: | |
| ret_list.append(sorted_bbox[0:1]) | |
| else: | |
| ret_list.append(sorted_bbox) | |
| return ret_list | |
| def qsort_bbox_list(bbox_list: list, | |
| only_max: bool = False, | |
| bbox_convention: Literal['xyxy', 'xywh'] = 'xyxy'): | |
| """Sort a list of bboxes, by their area in pixel(W*H). | |
| Args: | |
| input_list (list): | |
| A list of bboxes. Each item is a list of (x1, y1, x2, y2) | |
| only_max (bool, optional): | |
| If True, only assure the max element at first place, | |
| others may not be well sorted. | |
| If False, return a well sorted descending list. | |
| Defaults to False. | |
| bbox_convention (str, optional): | |
| Bbox type, xyxy or xywh. Defaults to 'xyxy'. | |
| Returns: | |
| list: | |
| A sorted(maybe not so well) descending list. | |
| """ | |
| # import pdb; pdb.set_trace() | |
| if len(bbox_list) <= 1: | |
| return bbox_list | |
| else: | |
| bigger_list = [] | |
| less_list = [] | |
| anchor_index = int(len(bbox_list) / 2) | |
| anchor_bbox = bbox_list[anchor_index] | |
| anchor_area = get_area_of_bbox(anchor_bbox, bbox_convention) | |
| for i in range(len(bbox_list)): | |
| if i == anchor_index: | |
| continue | |
| tmp_bbox = bbox_list[i] | |
| tmp_area = get_area_of_bbox(tmp_bbox, bbox_convention) | |
| if tmp_area >= anchor_area: | |
| bigger_list.append(tmp_bbox) | |
| else: | |
| less_list.append(tmp_bbox) | |
| if only_max: | |
| return qsort_bbox_list(bigger_list) + \ | |
| [anchor_bbox, ] + less_list | |
| else: | |
| return qsort_bbox_list(bigger_list) + \ | |
| [anchor_bbox, ] + qsort_bbox_list(less_list) | |
| def get_area_of_bbox( | |
| bbox: Union[list, tuple], | |
| bbox_convention: Literal['xyxy', 'xywh'] = 'xyxy') -> float: | |
| """Get the area of a bbox_xyxy. | |
| Args: | |
| (Union[list, tuple]): | |
| A list of [x1, y1, x2, y2]. | |
| bbox_convention (str, optional): | |
| Bbox type, xyxy or xywh. Defaults to 'xyxy'. | |
| Returns: | |
| float: | |
| Area of the bbox(|y2-y1|*|x2-x1|). | |
| """ | |
| # import pdb;pdb.set_trace() | |
| if bbox_convention == 'xyxy': | |
| return abs(bbox[2] - bbox[0]) * abs(bbox[3] - bbox[1]) | |
| elif bbox_convention == 'xywh': | |
| return abs(bbox[2] * bbox[3]) | |
| else: | |
| raise TypeError(f'Wrong bbox convention: {bbox_convention}') | |
| def calculate_iou(bbox1, bbox2): | |
| # Calculate the Intersection over Union (IoU) between two bounding boxes | |
| x1 = max(bbox1[0], bbox2[0]) | |
| y1 = max(bbox1[1], bbox2[1]) | |
| x2 = min(bbox1[2], bbox2[2]) | |
| y2 = min(bbox1[3], bbox2[3]) | |
| intersection_area = max(0, x2 - x1 + 1) * max(0, y2 - y1 + 1) | |
| bbox1_area = (bbox1[2] - bbox1[0] + 1) * (bbox1[3] - bbox1[1] + 1) | |
| bbox2_area = (bbox2[2] - bbox2[0] + 1) * (bbox2[3] - bbox2[1] + 1) | |
| union_area = bbox1_area + bbox2_area - intersection_area | |
| iou = intersection_area / union_area | |
| return iou | |
| def non_max_suppression(bboxes, iou_threshold): | |
| # Sort the bounding boxes by their confidence scores (e.g., the probability of containing an object) | |
| bboxes = sorted(bboxes, key=lambda x: x[4], reverse=True) | |
| # Initialize a list to store the selected bounding boxes | |
| selected_bboxes = [] | |
| # Perform non-maximum suppression | |
| while len(bboxes) > 0: | |
| current_bbox = bboxes[0] | |
| selected_bboxes.append(current_bbox) | |
| bboxes = bboxes[1:] | |
| remaining_bboxes = [] | |
| for bbox in bboxes: | |
| iou = calculate_iou(current_bbox, bbox) | |
| if iou < iou_threshold: | |
| remaining_bboxes.append(bbox) | |
| bboxes = remaining_bboxes | |
| return selected_bboxes |