Comparative evaluation of facial fiducial point detection approaches

2017 ◽  
Author(s):  
Vinicius Fernandes de Sousa ◽  
Herman Martins Gomes ◽  
Jose Eustaquio Rangel de Queiroz
Keyword(s):  
Comparative Evaluation ◽  
Fiducial Point ◽  
Point Detection

Reducing the Impact of External Vibrations on Fiducial Point Detection in Seismocardiogram Signals

2021 ◽  
pp. 1-1
Author(s):  
David Jimmy Lin ◽  
Jacob Kimball ◽  
Jonathan Sargon Zia ◽  
Venu Gopal Ganti ◽  
Omer Inan
Keyword(s):  
Fiducial Point ◽  
Point Detection ◽  
The Impact

scholarly journals Efficient Fiducial Point Detection of ECG QRS Complex Based on Polygonal Approximation

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4502 ◽  
Author(s):  
Seungmin Lee ◽  
Yoosoo Jeong ◽  
Daejin Park ◽  
Byoung-Ju Yun ◽  
Kil Park
Keyword(s):  
Morphological Changes ◽  
Polygonal Approximation ◽  
Qrs Complex ◽  
Fiducial Point ◽  
Change Rate ◽  
Practical Applications ◽  
Auxiliary Signal ◽  
Electrocardiogram Signal ◽  
Feature Values ◽  
Point Detection

Electrocardiogram signal analysis is based on detecting a fiducial point consisting of the onset, offset, and peak of each waveform. The accurate diagnosis of arrhythmias depends on the accuracy of fiducial point detection. Detecting the onset and offset fiducial points is ambiguous because the feature values are similar to those of the surrounding sample. To improve the accuracy of this paper’s fiducial point detection, the signal is represented by a small number of vertices through a curvature-based vertex selection technique using polygonal approximation. The proposed method minimizes the number of candidate samples for fiducial point detection and emphasizes these sample’s feature values to enable reliable detection. It is also sensitive to the morphological changes of various QRS complexes by generating an accumulated signal of the amplitude change rate between vertices as an auxiliary signal. To verify the superiority of the proposed algorithm, error distribution is measured through comparison with the QT-DB annotation provided by Physionet. The mean and standard deviation of the onset and the offset were stable as − 4.02 ± 7.99 ms and − 5.45 ± 8.04 ms, respectively. The results show that proposed method using small number of vertices is acceptable in practical applications. We also confirmed that the proposed method is effective through the clustering of the QRS complex. Experiments on the arrhythmia data of MIT-BIH ADB confirmed reliable fiducial point detection results for various types of QRS complexes.

Comparison of In-the-Ear and Over-the-Ear Hearing Aid Fittings

1986 ◽  
Vol 51 (4) ◽  
pp. 362-369 ◽  
Author(s):  
Donna M. Risberg ◽  
Robyn M. Cox
Keyword(s):  
Hearing Aids ◽  
High Frequency ◽  
Comparative Evaluation ◽  
Speech Intelligibility ◽  
Hearing Aid ◽  
Hearing Aid Fitting ◽  
The Difference ◽  
Functional Gain ◽  
The Relationship

A custom in-the-ear (ITE) hearing aid fitting was compared to two over-the-ear (OTE) hearing aid fittings for each of 9 subjects with mild to moderately severe hearing losses. Speech intelligibility via the three instruments was compared using the Speech Intelligibility Rating (SIR) test. The relationship between functional gain and coupler gain was compared for the ITE and the higher rated OTE instruments. The difference in input received at the microphone locations of the two types of hearing aids was measured for 10 different subjects and compared to the functional gain data. It was concluded that (a) for persons with mild to moderately severe hearing losses, appropriately adjusted custom ITE fittings typically yield speech intelligibility that is equal to the better OTE fitting identified in a comparative evaluation; and (b) gain prescriptions for ITE hearing aids should be adjusted to account for the high-frequency emphasis associated with in-the-concha microphone placement.

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