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You Only Look Once: Unified, Real-Time Object Detection

# Summary

  1. end-to-end
  2. extremely fast (base YOLO : 45 FPS, Fast YOLO : 155 FPS, other SOTA 7~20 FPS)
  3. YOLOv1-VGG16 mAP : 66.4% vs FasterRCNN mAP : 73.2% (Pascal VOC 2007 Test)
  4. small objects do not detect well.
  5. each grid cell only predicts two boxes and can only have one class.

# Difference from Paper

  1. GoogleNet -> ResNetv2-50, VGG16, Inception ResNet v2
  2. Removed the responsible part.

# Results (Pascal VOC 2007 Test AP@50)

Class (self) YOLOv1-VGG16 (self) YOLOv1-ResNetv2-50
aeroplane 75.23% 68.38%
bicycle 78.30% 70.28%
bird 67.54% 63.91%
boat 55.93% 49.64%
bottle 64.49% 57.35%
bus 78.75% 81.63%
car 77.83% 71.31%
cat 79.14% 78.95%
chair 63.65% 56.38%
cow 73.61% 72.50%
diningtable 68.76% 66.00%
dog 80.46% 76.45%
horse 79.26% 70.27%
motorbike 80.54% 73.30%
person 75.69% 70.37%
pottedplant 54.15% 56.02%
sheep 79.67% 75.43%
sofa 71.64% 67.10%
train 74.86% 76.29%
tvmonitor 76.21% 73.99%
Model Train mAP@50
(paper) Faster-RCNN VGG16 Pascal VOC 2007 + 2012 73.2%
(paper) YOLOv1 VGG16 Pascal VOC 2007 + 2012 66.4%
(self) YOLOv1 VGG16 Pascal VOC 2007 + 2012 72.78%
(self) YOLOv1 ResNet-v2-50 Pascal VOC 2007 + 2012 68.78%
(self) YOLOv1 Inception-ResNet-v2 Pascal VOC 2007 + 2012 69.05%

# Tensorboard

1. xy loss

res

2. wh loss

res

3. obj loss

res

4. noobj loss

res

5. class loss

res

# Test Samples

res res res res

# Reference

  • You Only Look Once: Unified, Real-Time Object Detection [Paper]
  • Faster R-CNN: Towards Real-Time Object Detection with Region Proposal Networks [Paper]

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