Investigation of Facial Region of Interest in Infrared Images for Real-Time Noncontact Respiration Monitoring
نویسندگان
چکیده
In this study thermal imaging was used to monitor respiration rate in a noncontact manner. The main focus was to investigate the shape of a region under the nose (called the region of interest, ROI) and the characterisation of this region by a representative feature to produce a respiration signal from which respiration rate was obtained. It was demonstrated that the respiration signal from a rectangular ROI produces least respiration signal drift as compared with circular and elliptic shapes. The circular ROI provided a larger magnitude respiration signal and the mode of the pixel values contained in it provided the best statistical measure for determining respiration rate as compared with median, standard deviation and mean. Rectangular ROI had a faster response to the changes in RR as compared with the other statistical measures used to represent the ROI.
منابع مشابه
Evaluation of Thresholding Based Noncontact Respiration Rate Monitoring using Thermal Imaging
A noncontact method for respiration rate monitoring using thermal imaging was developed and evaluated. Algorithms to capture images, detect the location of the face, locate the corners of the eyes from the detected face and thereafter locate the tip of the nose in each image were developed. The amount of emitted infrared radiation was then determined from the detected tip of the nose. Signal pr...
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