Digital Signal Processing Reference
In-Depth Information
2
Pilling Fabric I
Image Preprocessing
The design of the fabric pil
the area ratio calculated pi
cludes image capture, gray
binarization and median fil
the sample picture due to th
ing the difficulty of image
the percentage of accuracy.
let filtering noise removal
can not be avoided in the
and white of the image into
calculate the proportion of h
lling rating by the image pre-pretreatment to pilling par
illing fabric rating of three parts. Image preprocessing
y-scale, wavelet filtering, noise removed, black and wh
lter. The image capture in order to removal the impac
he artificial hand-cutting and other external factors, red
processing, and improved pilling part of the area ratio
The gray scale is the first step in image processing. Wa
in order to exclude the image selected sweep fashiona
dust impact to raise the ratio calculation accuracy. Bl
o binary is to finish next processing. The binarization i
hairiness and pilling.
rt of
in-
hite,
t of
duc-
o of
ave-
able
lack
s to
2.1
Image Read and Ca
apture
Read in the image are the R
ple normalized RGB model
RGB model images, the RGB model and standardized s
l.
sim-
R
G
B
,
,
.
r
=
g
=
b
=
(1)
R
+
G
+
+
B
R
+
G
+
B
R
+
G
+
B
r, g, b, said chromaticity co
dependent, ignored, expres
served ingredients common
of the RGB color property i
oordinates, because only two chromaticity coordinates
ssed by the chromaticity space is two-dimensional. P
nly known as a solid color, because the original brightn
in the standardization process to eliminate.
in-
Pre-
ness
Fig. 1.
The two images of th
scanner are showed. The left i
to the interception of the image
he standards sample photos or test photos which are scanned
is the original image, the right shows that a function is dedica
e rectangle
d by
ated
2.2
Image Graying
Color images often contain
of storage space. Technical
a large amount of color information, and will take up a
operation of the system will reduce the speed, and thus
a lot
s by
