An image-processing procedure that assures correct determination of the magnetic field distribution of magneto-optical images is presented. The method remedies image faults resulting from sources that are proportional to the incident light intensity, such as different types of defects in the indicator film and unevenness of light, as well as additive signals from detector bias, external light sources, etc. When properly corrected a better measurement of the local magnetic field can be made, even in the case of heavily damaged films. For superconductors the magnetic field distributions may be used for accurate determination of the current distributions without the spurious current loops associated with defects in the films.

1.
C. Y.
Yang
et al.,
Physica C
329
,
114
(
2000
).
2.
H.
Muller
,
M.
Suenaga
, and
Y.
Yokoyama
,
J. Appl. Phys.
70
,
4409
(
1991
).
3.
Y. H.
Liu
et al.,
Physica C
341
,
1337
(
2000
).
4.
T.
Frello
et al.,
Phys. Rev. B
59
,
R6639
(
1999
).
5.
P. E.
Goa
et al.,
Supercond. Sci. Technol.
14
,
729
(
2001
).
6.
R. J.
Wijngaarden
,
H. J. W.
Spoelder
,
R.
Surdeanu
, and
R.
Griessen
,
Phys. Rev. B
54
,
6742
(
1996
).
7.
C.
Jooss
,
R.
Warthmann
,
A.
Forkl
, and
H.
Kronmüller
,
Physica C
199
,
215
(
1998
).
8.
R. J.
Wijngaarden
et al.,
Rev. Sci. Instrum.
72
,
2661
(
2001
).
9.
M. R.
Koblischka
and
R. J.
Wijngaarden
,
Supercond. Sci. Technol.
8
,
199
(
1995
).
10.
A. V.
Bobyl
et al.,
Supercond. Sci. Technol.
13
,
183
(
2000
).
11.
S.
Flament
et al.,
IEEE Trans. Appl. Supercond.
11
,
3174
(
2001
).
12.
R. L. Gilliland, in Astronomical CCD Observing and Reduction Techniques, ASP Conference Series, Vol. 23 (Astronomical Society of the Pacific, 1992), p. 68.
13.
T. H.
Johansen
et al.,
Phys. Rev. B
54
,
16264
(
1996
).
14.
Ch.
Jooss
,
A.
Forkl
,
R.
Warthmann
,
H.-U.
Habermeier
,
B.
Leibold
, and
H.
Kronmueller
,
Physica C
266
,
235
(
1996
).
15.
This can be understood from Eqs. (4) and (5) as (SIGNAL-BIAS)/(1/AVE)(BACKGROUND-BIAS)=AVE if SIGNAL=BACKGROUND.
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