Python boxes.xyxy_to_xywh方法代码示例

# 需要导入模块: from detectron.utils import boxes [as 别名]
# 或者: from detectron.utils.boxes import xyxy_to_xywh [as 别名]
def _coco_bbox_results_one_category(json_dataset, boxes, cat_id):
    results = []
    image_ids = json_dataset.COCO.getImgIds()
    image_ids.sort()
    assert len(boxes) == len(image_ids)
    for i, image_id in enumerate(image_ids):
        dets = boxes[i]
        if isinstance(dets, list) and len(dets) == 0:
            continue
        dets = dets.astype(np.float)
        scores = dets[:, -1]
        xywh_dets = box_utils.xyxy_to_xywh(dets[:, 0:4])
        xs = xywh_dets[:, 0]
        ys = xywh_dets[:, 1]
        ws = xywh_dets[:, 2]
        hs = xywh_dets[:, 3]
        results.extend(
            [{'image_id': image_id,
              'category_id': cat_id,
              'bbox': [xs[k], ys[k], ws[k], hs[k]],
              'score': scores[k]} for k in range(dets.shape[0])])
    return results 

# 需要导入模块: from detectron.utils import boxes [as 别名]
# 或者: from detectron.utils.boxes import xyxy_to_xywh [as 别名]
def _filter_crowd_proposals(roidb, crowd_thresh):
    """Finds proposals that are inside crowd regions and marks them as
    overlap = -1 with each ground-truth rois, which means they will be excluded
    from training.
    """
    for entry in roidb:
        gt_overlaps = entry['gt_overlaps'].toarray()
        crowd_inds = np.where(entry['is_crowd'] == 1)[0]
        non_gt_inds = np.where(entry['gt_classes'] == 0)[0]
        if len(crowd_inds) == 0 or len(non_gt_inds) == 0:
            continue
        crowd_boxes = box_utils.xyxy_to_xywh(entry['boxes'][crowd_inds, :])
        non_gt_boxes = box_utils.xyxy_to_xywh(entry['boxes'][non_gt_inds, :])
        iscrowd_flags = [int(True)] * len(crowd_inds)
        ious = COCOmask.iou(non_gt_boxes, crowd_boxes, iscrowd_flags)
        bad_inds = np.where(ious.max(axis=1) > crowd_thresh)[0]
        gt_overlaps[non_gt_inds[bad_inds], :] = -1
        entry['gt_overlaps'] = scipy.sparse.csr_matrix(gt_overlaps) 

# 需要导入模块: from detectron.utils import boxes [as 别名]
# 或者: from detectron.utils.boxes import xyxy_to_xywh [as 别名]
def test_bbox_dataset_to_prediction_roundtrip(self):
        """Simulate the process of reading a ground-truth box from a dataset,
        make predictions from proposals, convert the predictions back to the
        dataset format, and then use the COCO API to compute IoU overlap between
        the gt box and the predictions. These should have IoU of 1.
        """
        weights = (5, 5, 10, 10)
        # 1/ "read" a box from a dataset in the default (x1, y1, w, h) format
        gt_xywh_box = [10, 20, 100, 150]
        # 2/ convert it to our internal (x1, y1, x2, y2) format
        gt_xyxy_box = box_utils.xywh_to_xyxy(gt_xywh_box)
        # 3/ consider nearby proposal boxes
        prop_xyxy_boxes = random_boxes(gt_xyxy_box, 10, 10)
        # 4/ compute proposal-to-gt transformation deltas
        deltas = box_utils.bbox_transform_inv(
            prop_xyxy_boxes, np.array([gt_xyxy_box]), weights=weights
        )
        # 5/ use deltas to transform proposals to xyxy predicted box
        pred_xyxy_boxes = box_utils.bbox_transform(
            prop_xyxy_boxes, deltas, weights=weights
        )
        # 6/ convert xyxy predicted box to xywh predicted box
        pred_xywh_boxes = box_utils.xyxy_to_xywh(pred_xyxy_boxes)
        # 7/ use COCO API to compute IoU
        not_crowd = [int(False)] * pred_xywh_boxes.shape[0]
        ious = COCOmask.iou(pred_xywh_boxes, np.array([gt_xywh_box]), not_crowd)
        np.testing.assert_array_almost_equal(ious, np.ones(ious.shape)) 

# 需要导入模块: from detectron.utils import boxes [as 别名]
# 或者: from detectron.utils.boxes import xyxy_to_xywh [as 别名]
def test_cython_bbox_iou_against_coco_api_bbox_iou(self):
        """Check that our cython implementation of bounding box IoU overlap
        matches the COCO API implementation.
        """
        def _do_test(b1, b2):
            # Compute IoU overlap with the cython implementation
            cython_iou = box_utils.bbox_overlaps(b1, b2)
            # Compute IoU overlap with the COCO API implementation
            # (requires converting boxes from xyxy to xywh format)
            xywh_b1 = box_utils.xyxy_to_xywh(b1)
            xywh_b2 = box_utils.xyxy_to_xywh(b2)
            not_crowd = [int(False)] * b2.shape[0]
            coco_ious = COCOmask.iou(xywh_b1, xywh_b2, not_crowd)
            # IoUs should be similar
            np.testing.assert_array_almost_equal(
                cython_iou, coco_ious, decimal=5
            )

        # Test small boxes
        b1 = random_boxes([10, 10, 20, 20], 5, 10)
        b2 = random_boxes([10, 10, 20, 20], 5, 10)
        _do_test(b1, b2)

        # Test bigger boxes
        b1 = random_boxes([10, 10, 110, 20], 20, 10)
        b2 = random_boxes([10, 10, 110, 20], 20, 10)
        _do_test(b1, b2)