Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生:...
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Transcript of Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生:...
![Page 1: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/1.jpg)
Real-time Human Motion Analysis by Image Skeletonization
指導教授:張元翔 老師學生: 9977003 吳思穎
![Page 2: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/2.jpg)
Outline
• Introduction------------------------------------------------------3• Real-time target extraction-----------------------------------5• Target pre-processing-----------------------------------------6
Pre-processing--------------------------------------------------6 “Star” skeletonization-------------------------------------------7 Advantages of “star” skeletonization---------------------------8
• Human motion analysis---------------------------------------10 Significant features of the “star” skeleton----------------------10 Cycle detection--------------------------------------------------12
• Analysis------------------------------------------------------------13• Conclusion--------------------------------------------------------15
![Page 3: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/3.jpg)
Introduction
• detecting and analyzing human motion in real time from video imagery has only recently become viable with algorithms like PJinder [9] and W4 [4].
• But !!! Two main drawbacks :
![Page 4: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/4.jpg)
Introduction
• They are completely human specific
• They require a great deal of image-based information in order to work effectively
![Page 5: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/5.jpg)
Real-time target extraction
• Temporal differencing
• Background subtraction
• Optical flow
![Page 6: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/6.jpg)
Target pre-processing
• Pre-processing :
![Page 7: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/7.jpg)
Target pre-processing
• “Star” skeletonization
![Page 8: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/8.jpg)
Target pre-processing
• Advantages of “star” skeletonization : It is not iterative and computationally cheap. It explicitly provides a mechanism for controlling scale
sensitivity. It relies on no a priori human model.
![Page 9: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/9.jpg)
Target pre-processing
![Page 10: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/10.jpg)
Human motion analysis
• Significant features of the “star” skeleton
![Page 11: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/11.jpg)
Human motion analysis
• Significant features of the “star” skeleton
![Page 12: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/12.jpg)
Human motion analysis• Cycle detection
![Page 13: Real-time Human Motion Analysis by Image Skeletonization 指導教授:張元翔 老師 學生: 9977003 吳思穎.](https://reader035.fdocuments.net/reader035/viewer/2022062304/56649d135503460f949e72fa/html5/thumbnails/13.jpg)
Analysis
• Figure 8. Histogram of cyclic motion frequency peaks. (a) The bias in often produces a frequency peak which is significantly higher than the peak produced by cyclic motion. (b) The pre-emphasis filter effectively removes this noise.
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Analysis
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Conclusion
• Further, two analysis techniques have been investigated which can broadly classify human motion. Body inclination can be measured from the “star” skeleton to determine the posture of the human, which derives clues as to the type of motion being executed.
• In addition, cyclic analysis of extremal points provides a very clean way of broadly distinguishing human motion in terms of walking and running and potentially even different types of gait.
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Thanks for everybody’s listening