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Haar finder


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Vision with OF:
This lecture is from the computer vision section of the course on udemy. Learn how to use haar cascades to track faces and objects. Get valuable links to haar training and understand its use in openframeworks

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Haar finder

  1. 1. vision with of Add Vision to your Apps Hasan Ijaz October 31, 2015 EmbeddedLance
  2. 2. haar features
  3. 3. Haar-Like Features ∙ ”A general framework for object detection”, Papageorgiou et al, 1998 ∙ ”Rapid object detection using a boosted cascade of simple features”, Viola and Jones, 2001 ∙ 2
  4. 4. Haar-Like Features Detection Method ∙ Adjacent rectangular regions at a specific location in a detection window ∙ Sum up pixel intensities in each region ∙ Calculate difference between these sums ∙ Compare this difference with a learned threshold ∙ Categorize subsections of image based on this difference 3
  5. 5. Haar Cascade ∙ Single Haar-Like Feature is slightly better than random guessing ∙ Classifier Cascade ∙ Key advantage: Calculation Speed 4
  6. 6. Haar Cascade How to train Haar Cascades ∙ OpenCV ∙ Nao Toshi 5
  7. 7. Haar Cascade Download Trained Cascades ∙ OpenCV ∙ Alejandro F. Reimondo ∙ Face Features 6
  8. 8. code
  9. 9. ofxCvHaarFinder ∙ setup ∙ findHaarObjects 8
  10. 10. You can now detect objects using a haar finder :) 9