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REAL-TIME VISION BASED

RESPIRATION MONITORING

SYSTEM

Under Guidance of

By:

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INTRODUCTION

Respiration rate is an important indicator of

an individual's health.

Respiratory rate is an important physiologicalmeasure used in clinical environments to examine

the health of an individual.

Respiration monitoring can be contactor

noncontactbased.

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CONTACT BASED MONITORING SYSTEM

The sensing device is attached to the subject's

body

Thermistors Method

Stain-gage pressure sensors

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DRAWBACKS:

The attachment of the sensors to the patient's

body causes discomfort and the resulting stress

can affect breathing rate.

The thermistor approach has a further cost

disadvantage as the sensing device is disposed

after a single use for hygiene reasons.

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ADVANTAGES:

Safe

cost effective

accurate

easy to use.

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VIDEO BASED BODY MOVEMENT DETECTION

Respiration process causes a semi-periodic chestand abdominal movements that is performed in asubconscious manner.

Detecting and tracking movements involvecomplex algorithms that require intensivecomputations.

Convenient method of detecting movement is bysubtracting consecutive images in the recordedvideo.

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CONT..

The recorded video consists of a sequence of images captured at a

specific sample rate. The difference of consecutive images

represents motion. This motion is the difference in the image

scenery related to displacement of objects. This effect is as shown

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METHODOLOGY

A Graphical User Interface (GUI)

A video consisted of a series of sequential images, each marked

with an individual time stamp (t), corresponding the time of

recording.

The algorithm was designed to perform an image subtraction

using the current image at time t ( imgt ) and the image a few time

frames before at time t-td

( imgt td ), where value of td was determinedby considering the

speed of the algorithm.

The resulting image imgdiff was then thresholded to produce img

X

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CONT

The pixels values of img X were summed, producing a

data value (X)

img X that represented a scenery change that could be

interpreted as the movement magnitude during timet-td

The larger the value of X ,the bigger would be the

detected movement magnitudes corresponding to eachtime point t.

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CONT

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CONT

General illustration of algorithm

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CONT..

The lobes represents chest and adnominal movements

forward and backward

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EXPERIMENTS AND RESULTS

The algorithm will run in real time with a frame

rate of 10 frames per second

A series of tests were performed each lasting

between 3 to 10 minutes

Tests were performed initially on an adult subject

while he sat on a chair in front of the video

camera.

The tests were performed in different scenarios

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CONT

Video based respiration system automatically determined the respiration

rate to be 19.4 cycle per minute. A manual count of respiration cycles for

the data provided by thermistor and stain gage systems indicatedrespiration rate of about 20 cycles per minute

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COMPARISON OF DIFFERENT METHODS

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LIMITATIONS

When subject moved significantly, the

respiration signal become too distorted to be

detected correctly.

Another shortcoming of the system was it

was susceptible to the movements behind

the subject being monitored.

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THANK YOU.