Abstract
The main idea of proposed paper is to specify and verify the segmentation method (or a group of segmentation techniques) ideal for tracking a moving object in a scene. The object is represented by an animal (guinea pig) in a laboratory cage. Object tracking based on visual system uses and compares different techniques of segmentation: global thresholding, adaptive thresholding, differential operators used for motion detection in a video sequence and color matching algorithm implemented from industrial applications. Animal activity is a significant marker corresponding with health status. Trajectory of an animal is a good quantitative parameter for evaluation of its activity. In our case, animal tracking was used for induced gastrointestinal diseases (gastric ulcer) in the group of guinea pigs. The results serve as a supporting tool in pharmacology and pathological physiology to set optimal therapy and medication for selected groups of diseases and also help to understand the mechanisms of diseases in the medical research. Experimental measurements were taken in the large database of healthy (reference) animals and “non-healthy” ones. The visual system-based animal (object) tracking could be used as a non-expensive and flexible (reconfigurable) replacement of radio-frequency identifiers. The paper also discusses the possibility to use introduced methods in real-time applications.
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Abbreviations
- \(\mu \) :
-
Mean value
- AND:
-
Logical multiplication
- B(i; j):
-
Pixel at position [i; j] in background corrected image
- CF:
-
Current (actual) frame (of video sequence)
- CoefVar :
-
Coefficient of variation
- d(n):
-
n-th frame of differential image
- E(k) :
-
Error of pixel misclassification
- f(n) :
-
n-th frame of video sequence
- \(f_\mathrm{ref }\) :
-
Reference frame of video sequence (or empty background image)
- \(H_\mathrm{b}\) :
-
Entropy of background (black) pixels
- HSI :
-
Hue/saturation/intensity color space
- \(H_\mathrm{w}\) :
-
Entropy of foreground (white) pixels
- I(i; j):
-
Pixel at position [i; j] in original image
- IP:
-
Internet protocol
- IR:
-
Infra red
- k :
-
Image threshold value
- m(i; j):
-
Mean value of pixel region centered at position [i; j]
- MAX:
-
Maximal value of given set of numbers
- MIN:
-
Minimal value of given set of numbers
- NF:
-
Next frame (of video sequence)
- p(i; j) :
-
Pixel value at position [i; j]
- \(P_\mathrm{b}\) :
-
Probability of occurrence of background (black) pixels
- PF:
-
Previous frame (of video sequence)
- \(P_\mathrm{w}\) :
-
Probability of occurrence of foreground (white) pixels
- RFID:
-
Radio-frequency identification
- RGB:
-
Red/green/blue color space
- ROI:
-
Region of interest
- StdDev:
-
Standard deviation of given set of numbers
- \(\Delta x\) :
-
Difference of trajectory in x-direction
- \(\Delta y\) :
-
Difference of trajectory in y-direction
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Acknowledgements
Authors of this paper wish to kindly thank to all supporting bodies, especially to Grant APVV-15-0462: Research on sophisticated methods for analyzing the dynamic properties of respiratory epithelium’s microscopic elements and projects Centre of Experimental and Clinical Respirology,” IMTS code: 26220120004 and “Measurement of Respiratory Epithelium Cilium Kinematics,” IMTS code: 26220120019 funded by European Community, also for financial support to Slovak Research.
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Paper is extended version for special issue ELEKTRO 2016.
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Koniar, D., Hargaš, L., Loncová, Z. et al. Visual system-based object tracking using image segmentation for biomedical applications. Electr Eng 99, 1349–1366 (2017). https://doi.org/10.1007/s00202-017-0609-0
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DOI: https://doi.org/10.1007/s00202-017-0609-0