diff --git a/coco_evaluation.py b/coco_evaluation.py
index 65a3e88..d592092 100644
--- a/coco_evaluation.py
+++ b/coco_evaluation.py
@@ -52,16 +52,17 @@ def getDetections(groundtruth, evaluation, imgIds = [], annIds = [], detection_t
 
 		for gt_box_id in gt_bboxes:
 			gt_box = groundtruth.anns[gt_box_id]['bbox']
-			max_iou = detection_threshold
+			max_iou = 0.0
 			match = None
 			for eval_box_id in eval_bboxes:
 				eval_box = evaluation.anns[eval_box_id]['bbox']
 				iou = iou_score(gt_box,eval_box)
-				if iou > max_iou:
+				if iou >= detection_threshold and iou > max_iou:  # seek best match
+					max_iou = iou
 					match = eval_box_id
-			if match:
-				detectRes['true_positives'].append({'gt_id': gt_box_id, 'eval_id': eval_box_id})
-				eval_bboxes.remove(eval_box_id)
+			if match is not None:
+				detectRes['true_positives'].append({'gt_id': gt_box_id, 'eval_id': match})
+				eval_bboxes.remove(match)
 			else:
 				detectRes['false_negatives'].append({'gt_id': gt_box_id})
 		if len(eval_bboxes)>0:
@@ -125,22 +126,23 @@ def evaluateEndToEnd(groundtruth, evaluation, imgIds = [], annIds = [], detectio
 				continue
 			gt_val = decode(groundtruth.anns[gt_box_id]['utf8_string'])
 
-			max_iou = detection_threshold
+			max_iou = 0.0
 
 			match = None
 			for eval_box_id in eval_bboxes:
 				eval_box = evaluation.anns[eval_box_id]['bbox']
 				iou = iou_score(gt_box,eval_box)
 
-				if iou > max_iou:
+				if iou >= detection_threshold and iou > max_iou:
+					max_iou = iou
 					match = eval_box_id
 					if 'utf8_string' in evaluation.anns[eval_box_id]:
 						eval_val = decode(evaluation.anns[eval_box_id]['utf8_string'])
 						if editdistance.eval(gt_val, eval_val)==0:
 							break
 			if match is not None:
-				detectRes['true_positives'].append({'gt_id': gt_box_id, 'eval_id': eval_box_id})
-				eval_bboxes.remove(eval_box_id)
+				detectRes['true_positives'].append({'gt_id': gt_box_id, 'eval_id': match})
+				eval_bboxes.remove(match)
 			else:
 				detectRes['false_negatives'].append({'gt_id': gt_box_id})
 		if len(eval_bboxes)>0: