第20卷第4期
2012年4月
光
0ptics
and
学精密工程
Precjsion
Enginee“ng
V01.20
No.4
Apr.2012
文章编号
1004—924X(2012)04一0906一07
基于多波段预测的高光谱图像分布式无损压缩
粘永健“,辛
勤,汤
毅,万建伟
(国防科技大学电子科学与工程学院,湖南长沙410073)
摘要:提出了一种基于分布式信源编码的高光谱图像无损压缩算法,用于星载高光谱数据的有效压缩。为充分利用高光
谱图像较强的谱问相关性,引入多波段谱间线性预测方案获取当前编码块的预测值,有效降低了编码块的最大预测残差
值。在此基础上,根据最大预测残差值确定编码块各像素所属陪集的索引,通过传输每个像素所属陪集的索引代替预测
残差,实现高光谱图像压缩。对星载可见/红外成像光谱仅(AVIRIs)获取的高光谱图像进行实验,并与已有的典型算法
进行比较,结果显示该算法能够取得较好的无损压缩效果,同时具有较低的编码复杂度,适用于星载高光谱图像的无损
压缩。
关键词:高光谱图像;无损压缩;分布式信源编码;多波段预测
中图分类号:TP751.1
文献标识码:A
doi:10.3788/0PE.20122004.0906
Distributed
lossless
compression
of
hyperspectral
images
baSed
on
mul
ti—band
prediction
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Abstract:A
lossless
compression
algorithm
based
on
distributed
source
coding
was
proposed
to
com—
press
the
airborne
hyperspectral
data
effectively.
In
order
to
make
fuU
use
of
the
spectral
correlation
of
hyperspectral
images,a
multi—band
prediction
scheme
was
introduced
to
acquire
the
prediction
val一
ues
of
the
current
block
and to
reduce
the
maximal
absolute
value
of
prediction
error
effectively.
Then,by
using
the
maximal
absolute
value
to
determine
the
coset
index
of
pixels
belonging
to
the
cur—
rent
block,the
10ssless
compression
of
hyperspectral
images
was
realized
by
transmitting
the
coset
in—
dex
of
the
current
block
instead
of
its
prediction
error.
Experin{晏ntal
results
on
hyperspectral
images
acquired
by
Airborne
Visible
Infrared
Imaging
Spectrometer(AVIRIS)show
that
the
proposed
algo—
rithm
can
offer
both
high
compression performance
and low
encoder
complexity
compared
with
th。se
existing
classical
algorithms,which
is
available
for
on.board
compression
of
hyperspectral
images.
Key
words:hyperspectral
image;loss【ess
compression;distributed
source
coding;mutiband
prediction
收稿日期:2011—11—23:修订日期:2012一Ol—05.
基金项目:国家自然科学基金资助项目(No.61101183,40901216);武器装备预研资金资助项目
万方数据