def _compute_is_aclass_correctly_detected_in_image(self, detected_boxes,
detected_scores,
groundtruth_boxes):
"""Compute CorLoc score for a single class.
Args:
detected_boxes: A numpy array of shape [N, 4] representing detected box
coordinates
detected_scores: A 1-d numpy array of length N representing classification
score
groundtruth_boxes: A numpy array of shape [M, 4] representing ground truth
box coordinates
Returns:
is_class_correctly_detected_in_image: An integer 1 or 0 denoting whether a
class is correctly detected in the image or not
"""
if detected_boxes.size > 0:
if groundtruth_boxes.size > 0:
max_score_id = np.argmax(detected_scores)
detected_boxlist = np_box_list.BoxList(
np.expand_dims(detected_boxes[max_score_id, :], axis=0))
gt_boxlist = np_box_list.BoxList(groundtruth_boxes)
iou = np_box_list_ops.iou(detected_boxlist, gt_boxlist)
if np.max(iou) >= self.matching_iou_threshold:
return 1
return 0
def _get_overlaps_and_scores_relation_tuples(self, detected_box_tuples,
groundtruth_box_tuples):
"""Computes overlaps and scores between detected and groundtruth tuples.
Both detections and groundtruth boxes have the same class tuples.
Args:
detected_box_tuples: A numpy array of structures with shape [N,],
representing N tuples, each tuple containing the same number of named
bounding boxes.
Each box is of the format [y_min, x_min, y_max, x_max]
groundtruth_box_tuples: A float numpy array of structures with the shape
[M,], representing M tuples, each tuple containing the same number
of named bounding boxes.
Each box is of the format [y_min, x_min, y_max, x_max]
Returns:
result_iou: A float numpy array of size
[num_detected_tuples, num_gt_box_tuples].
"""
result_iou = np.ones(
(detected_box_tuples.shape[0], groundtruth_box_tuples.shape[0]),
dtype=float)
for field in detected_box_tuples.dtype.fields:
detected_boxlist_field = np_box_list.BoxList(
detected_box_tuples[field])
gt_boxlist_field = np_box_list.BoxList(
groundtruth_box_tuples[field])
iou_field = np_box_list_ops.iou(detected_boxlist_field,
gt_boxlist_field)
result_iou = np.minimum(iou_field, result_iou)
return result_iou
def _compute_tp_fp_for_single_class(self, detected_boxes, detected_scores,
groundtruth_boxes,
groundtruth_is_difficult_list):
"""Labels boxes detected with the same class from the same image as tp/fp.
Args:
detected_boxes: A numpy array of shape [N, 4] representing detected box
coordinates
detected_scores: A 1-d numpy array of length N representing classification
score
groundtruth_boxes: A numpy array of shape [M, 4] representing ground truth
box coordinates
groundtruth_is_difficult_list: A boolean numpy array of length M denoting
whether a ground truth box is a difficult instance or not
Returns:
scores: A numpy array representing the detection scores
tp_fp_labels: a boolean numpy array indicating whether a detection is a
true positive.
"""
if groundtruth_boxes.size == 0:
is_gt_box_detected = np.array([], dtype=bool)
else:
is_gt_box_detected = np.zeros(groundtruth_boxes.shape[0],
dtype=bool)
if detected_boxes.size == 0:
return np.array([], dtype=float), np.array(
[], dtype=bool), is_gt_box_detected
detected_boxlist = np_box_list.BoxList(detected_boxes)
detected_boxlist.add_field('scores', detected_scores)
detected_boxlist = np_box_list_ops.non_max_suppression(
detected_boxlist, self.nms_max_output_boxes,
self.nms_iou_threshold)
scores = detected_boxlist.get_field('scores')
if groundtruth_boxes.size == 0:
return scores, np.zeros(detected_boxlist.num_boxes(),
dtype=bool), is_gt_box_detected
gt_boxlist = np_box_list.BoxList(groundtruth_boxes)
iou = np_box_list_ops.iou(detected_boxlist, gt_boxlist)
max_overlap_gt_ids = np.argmax(iou, axis=1)
tp_fp_labels = np.zeros(detected_boxlist.num_boxes(), dtype=bool)
is_matched_to_difficult_box = np.zeros(detected_boxlist.num_boxes(),
dtype=bool)
for i in range(detected_boxlist.num_boxes()):
gt_id = max_overlap_gt_ids[i]
if iou[i, gt_id] >= self.matching_iou_threshold:
if not groundtruth_is_difficult_list[gt_id]:
if not is_gt_box_detected[gt_id]:
tp_fp_labels[i] = True
is_gt_box_detected[gt_id] = True
else:
is_matched_to_difficult_box[i] = True
return scores[~is_matched_to_difficult_box], tp_fp_labels[
~is_matched_to_difficult_box], is_gt_box_detected
def _compute_is_class_correctly_detected_in_image(self,
detected_boxes,
detected_scores,
groundtruth_boxes,
detected_masks=None,
groundtruth_masks=None):
"""Compute CorLoc score for a single class.
Args:
detected_boxes: A numpy array of shape [N, 4] representing detected box
coordinates
detected_scores: A 1-d numpy array of length N representing classification
score
groundtruth_boxes: A numpy array of shape [M, 4] representing ground truth
box coordinates
detected_masks: (optional) A np.uint8 numpy array of shape
[N, height, width]. If not None, the scores will be computed based
on masks.
groundtruth_masks: (optional) A np.uint8 numpy array of shape
[M, height, width].
Returns:
is_class_correctly_detected_in_image: An integer 1 or 0 denoting whether a
class is correctly detected in the image or not
"""
if detected_boxes.size > 0:
if groundtruth_boxes.size > 0:
max_score_id = np.argmax(detected_scores)
mask_mode = False
if detected_masks is not None and groundtruth_masks is not None:
mask_mode = True
if mask_mode:
detected_boxlist = np_box_mask_list.BoxMaskList(
box_data=np.expand_dims(detected_boxes[max_score_id],
axis=0),
mask_data=np.expand_dims(detected_masks[max_score_id],
axis=0))
gt_boxlist = np_box_mask_list.BoxMaskList(
box_data=groundtruth_boxes,
mask_data=groundtruth_masks)
iou = np_box_mask_list_ops.iou(detected_boxlist,
gt_boxlist)
else:
detected_boxlist = np_box_list.BoxList(
np.expand_dims(detected_boxes[max_score_id, :],
axis=0))
gt_boxlist = np_box_list.BoxList(groundtruth_boxes)
iou = np_box_list_ops.iou(detected_boxlist, gt_boxlist)
if np.max(iou) >= self.matching_iou_threshold:
return 1
return 0
def _get_overlaps_and_scores_box_mode(self, detected_boxes,
detected_scores, groundtruth_boxes,
groundtruth_is_group_of_list):
"""Computes overlaps and scores between detected and groudntruth boxes.
Args:
detected_boxes: A numpy array of shape [N, 4] representing detected box
coordinates
detected_scores: A 1-d numpy array of length N representing classification
score
groundtruth_boxes: A numpy array of shape [M, 4] representing ground truth
box coordinates
groundtruth_is_group_of_list: A boolean numpy array of length M denoting
whether a ground truth box has group-of tag. If a groundtruth box
is group-of box, every detection matching this box is ignored.
Returns:
iou: A float numpy array of size [num_detected_boxes, num_gt_boxes]. If
gt_non_group_of_boxlist.num_boxes() == 0 it will be None.
ioa: A float numpy array of size [num_detected_boxes, num_gt_boxes]. If
gt_group_of_boxlist.num_boxes() == 0 it will be None.
scores: The score of the detected boxlist.
num_boxes: Number of non-maximum suppressed detected boxes.
"""
detected_boxlist = np_box_list.BoxList(detected_boxes)
detected_boxlist.add_field('scores', detected_scores)
detected_boxlist = np_box_list_ops.non_max_suppression(
detected_boxlist, self.nms_max_output_boxes,
self.nms_iou_threshold)
gt_non_group_of_boxlist = np_box_list.BoxList(
groundtruth_boxes[~groundtruth_is_group_of_list])
gt_group_of_boxlist = np_box_list.BoxList(
groundtruth_boxes[groundtruth_is_group_of_list])
iou = np_box_list_ops.iou(detected_boxlist, gt_non_group_of_boxlist)
ioa = np.transpose(
np_box_list_ops.ioa(gt_group_of_boxlist, detected_boxlist))
scores = detected_boxlist.get_field('scores')
num_boxes = detected_boxlist.num_boxes()
return iou, ioa, scores, num_boxes
def test_iou(self):
iou = np_box_list_ops.iou(self.boxlist1, self.boxlist2)
expected_iou = np.array(
[[2.0 / 16.0, 0.0, 6.0 / 400.0], [1.0 / 16.0, 0.0, 5.0 / 400.0]],
dtype=float)
self.assertAllClose(iou, expected_iou)