<s>
that	O
performs	O
5-times	O
faster	O
than	O
the	O
original	O
lossless	B-Algorithm
JPEG	O
codec	O
and	O
achieves	O
a	O
similar	O
compression	B-General_Concept
ratio	I-General_Concept
.	O
</s>
<s>
Like	O
other	O
lossless	B-Algorithm
codecs	I-Algorithm
for	O
continuous-tone	O
images	O
,	O
FELICS	B-Algorithm
operates	O
by	O
decorrelating	B-Algorithm
the	O
image	O
and	O
encoding	O
it	O
with	O
an	O
entropy	B-Algorithm
coder	I-Algorithm
.	O
</s>
<s>
FELICS	B-Algorithm
improvements	O
include	O
methods	O
for	O
estimating	O
Δ	O
and	O
estimating	O
k	O
.	O
</s>
