Biomedical Engineering Reference
In-Depth Information
Acquisition of
videosequences in
BMP format
Partial thresholding
Extraction of lens
Detection of ROI
Detection and
numbering of the
objects
Averaged
horizontal
summation
Partial thresholding
Elimination of 1
st
PI
Lens centre
Averaged vertical
summation
Double generalized
difference
Search of the curve
minimum and
surroundings
interpolation
Polynomial
interpolation
Subtraction
−
relative distance
a
1
coefficient -
Position of 1
st
PI
Accommodation
Vergence
Fig. 10
Real photos of E.M.AN. - patient's room (
a
), measuring room (
b
) (details in Fig.
7
)
CA-DI-0256A was used for the measurements. The maximum spectral sensitivity
of the DALSA IA-DA image sensor is at the wavelength
œ D
825 nm, the sensor's
spatial resolution is low 128
256 with used binning). The
camera speed is 360 fps with regards to the velocity of reaction in hundreds of
ms. Only one eye is recorded to achieve sufficient resolution.
This image analysis is the same for each pictures of the grabbed sequence. First
step of our image analysis is choice of a region of interest (ROI) that eliminates
128 pixels (256
