Answers.Body: <p>The integer coordinates refer to the top-left corner of a pixel. Adding 0.5 to both x and y gives you the center location of a pixel instead.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-04-28T08:46:18.707Z
Answers.LastActivityDate: 2020-04-28T08:46:18.707Z
Answers.UserDisplayName: GPhilo
Body: <p>In the paper <a href="https://arxiv.org/abs/1512.02325" rel="nofollow noreferrer">SSD: Single Shot MultiBox Detector</a>, under section 2.2 - (4), why do we add an offset of <strong>0.5</strong> to x, y in generating the anchor boxes across feature maps? </p>
  
Tags: <computer-vision><object-detection><papers>
Title: Why do we set offset (0.5) in single shot detector?
UserDisplayName: 147956
ThreadText: # Why do we set offset (0.5) in single shot detector?
  
  (Asked by: username_0 on 2020-04-28)
  
  In the paper [SSD: Single Shot MultiBox Detector](https://arxiv.org/abs/1512.02325), under section 2.2 - (4), why do we add an offset of **0.5** to x, y in generating the anchor boxes across feature maps?
  
  **Tags:** computer-vision, object-detection, papers
  
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  ## 1 answers
  
  ### Answer by username_1 on 2020-04-28. Score: 0 | Accepted answer
  
  The integer coordinates refer to the top-left corner of a pixel. Adding 0.5 to both x and y gives you the center location of a pixel instead.
  
  
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