Two-stage detector vs One-stage detector

Related to: Applications

개요

2 Stage Detector는 느린 속도 대신 정밀성을 확보할 수 있고 1 Stage Detector는 조밀하고 작은 물체를 감지할 때 성능이 저하되는 대신 빠른 속도를 예측할 수 있습니다.

핵심 개념

• Object detection 시, ROI Search와 ROI 내 Image Classification을 별도로 수행하면 Two-stage detector, 한번에 수행한다면 One-stage detector
  • 속도 : Two Stage detector < One-stage detector(better)
  • 정확도 : Two Stage detector(better) < One-stage detector
• Traditional Methods
  • Raw Image Segmentation → 유사 영역 Merge → 후보 영역(Candidate box) 추출

Two-stage detector

• R-CNN

  Info

  https://arxiv.org/pdf/1311.2524.pdf

• Fast RCNN

  Info

  https://www.cv-foundation.org/openaccess/content_iccv_2015/papers/Girshick_Fast_R-CNN_ICCV_2015_paper.pdf

• Faster RCNN

  Info

  https://arxiv.org/pdf/1506.01497.pdf

One-stage detector

• Yolo v1(You Only Look Once)

  Info

  https://www.cv-foundation.org/openaccess/content_cvpr_2016/papers/Redmon_You_Only_Look_CVPR_2016_paper.pdf

• SSD(Single Shot Multibox Detector)

  Info

  https://arxiv.org/pdf/1512.02325.pdf

• RetinaNet

  Info

  https://arxiv.org/pdf/1708.02002.pdf

• etc. Detection with Transformer

  • DETR

    Info

    https://arxiv.org/pdf/2005.12872.pdf

관련 개념

• Object Detection History(2001~2022) — Object Detection 발전 역사
• Yolo v1(You Only Look Once) — 대표적인 One-stage Detector
• SSD(Single Shot Multibox Detector) — 대표적인 One-stage Detector
• RetinaNet — Focal Loss로 Class imbalance를 해결한 One-stage Detector
• RPN(Region Proposal Network) — Two-stage Detector의 핵심 구성요소
• NMS(Non-Maximum Suppression) — Object Detection에서 중복 박스 제거

참조

https://stackoverflow.com/questions/65942471/one-stage-vs-two-stage-object-detection

Week 4

https://arxiv.org/pdf/1905.05055.pdf