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ning the values of x
j
and y
j
for the jth concentration data point C
j
, the
app saved the data points in an internal database to complete the calibration before
returning to the main screen.
After de
6.2.2 User Interface of the Smartphone Application
The iOS (Fig.
6.3
a
6.3f-j) apps were designed to direct the
user in all the steps necessary to perform an analysis of a point-of-care diagnostic
test. First, the user might choose functions from sample testing, system calibration,
sensor type selection and test history viewing (Fig.
6.3
a, f). Before sample testing,
the user
e) and Android (Fig.
6.3
f
-
-
; this allowed capturing
and processing a set of reference images of the required concentration range. The
calibration was recorded under a given ambient light condition. When the ambient
light changed (e.g. colour, intensity and tone), the reader needed to be recalibrated.
For sample testing, the user selected
first calibrated the system by choosing
'
calibration
'
'
'
sensor type
function to specify the type of
Fig. 6.3 Screenshots of the iOS (iPhone 5, 8 MP camera) and Android (Samsung I5500 Galaxy 5,
2 MP camera) apps, which quantify the colorimetric test strip for urinalysis. a Main menu
displaying sample testing, calibration and test history viewing. b The app displays sensor types.
c User captures the image of the test zones. d The diagnostic test results are displayed to the user.
e The information received from the physician displayed on the
final screen include user-speci
c
instructions. f
−
f−j Android version of the same steps a
-
e, respectively. Reprinted from Ref. [
21
],
Copyright (2014), with permission from Elsevier
