Weed Detection over Between-row of Sugarcane Fields using Machine Vision with Shadow Robustness Technique for Variable Rate Herbicide Applicator

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18 Οκτ 2013 (πριν από 3 χρόνια και 9 μήνες)

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International Conference on Science, Technology and Innovation for Sustainable Well
-
Being
(STISWB), 23
-
24 July 2009, Mahasarakham University, Thailand

Weed Detection

over

Between
-
row of
Sugarcane Fields

using

Machine Vision
with
Shadow

R
obustness
Technique
for
Variable Rate Herbicide Applicator

A.
Muankasem, S.
Thainimit

EE Department

Kasetsart University

50 phaholyothin Rd.,
Jatujak Bangkok 10900 Thailan
d

E
-
mail:

uripot@hotmail.com
,

fengsyt@ku.ac.th


R. Keinprasit

NECTEC 112 Thailand Science Park
Phahon Yothin Rd., Klong 1, Klong Luang, Pathumthani 12120,
Thailand

E
-
mail:

r
achaporn.keinprasit@nectec.or.th

Abstract


U
niformly herbicide rate is used as
a
conventional practice

in Thailand

for controlling
weeds

in
sugarcane

fields
.

Since w
eeds

usually

grow in certain areas

with
non
-
uniform
ly
distribution,
u
niform
herbicide
rat
e

approach
is not suitable and
non
-
sustainable

agricultural technique

both in
terms of economic an environmental aspect.


To address the
s
e

issues
, v
ariable herbicide rate (VHR)
was introduced
. The VHR composes of two main
component
s
, which are
weed moni
to
ring and real
-
time spraying. This paper
deal
s

with
a
development of a

fast and robust weed monitoring

system for
VHR using over between
-
row of sugarcane field
s
.

The proposed method is designed to work under
natural illumination condition. The near
-
ground

images are captured using a typical web camera
without any assistant light diffuser.

The proposed

weed monitoring

is a machine vision based
approach. The offset excessive green (OEC) technique is used to initially separate green weeds from
soil backgrou
nd.

Then, a
dditional

greenness under highlights and shadows are analyzed using
t
wo
new techniques.

The
techniques
exploit

variations among three triplets, which are red, green and blue

under bright and dull lighting condition
. The proposed method is ev
aluated using 250 field images
captured under variation conditions such as sunny and rainy day.
From our
experiments
, the
developed system

show
s

promising results. Weeds under different lighting conditions are reliably
detects.
The
method is fast and rob
ust, suitable for using
in natural field environment.



Keyword
:
machine vision,
greenness, threshold
level,

greenness under
shadows,

Variable rate
applicator