USO0RE39985E
(19) United States (12) Reissued Patent
(10) Patent Number:
Tatsuta (54)
US RE39,985 E
(45) Date of Reissued Patent: *
Jan. 1, 2008
INFORMATION REPRODUCING SYSTEM,
5,449,895 A
INFORMATION RECORDING MEDIUM,
5,591,956 A *
9/1995 Hecht et a1. .............. .. 235/494
1/1997 Longacre et a1.
AND INFORMATION RECORDING
5,777,309 A
7/1998 Maltsev et a1. ........... .. 235/454
*
235/494
APPARATUS
(75)
Inventor: .
Se1J1 Tatsuta, Hrno (JP) _
FOREIGN PATENT DOCUMENTS 0 670 555 Al * 9/l995
EP
.
EP
0 717 398 A3 *
6/1996
(73) Assrgnee. Olympus Optical Co., Ltd., Tokyo (JP)
JP
(21)
Appl. No.: 09/851,874
JP
7230519 A
8/1995
(22)
Flledl
JP
7234914 A
9/1995
_
May 9, 2001 Related US. Patent Documents
5961383
* 4/1984
JP
4-139898
*
JP
6-259588 A
*
Reissue of:
(58)
5,943,448 Aug‘ 24’ 1999
Primary Examineriscott A. Rogers
APPI' NO‘:
08/764,136
(74) Attorney, Agent, or FirmiFrishauf, HoltZ, Goodman
Filed:
Dec. 12, 1996
& Chick’ RC
Foreign Application Priority Data
Dec. 25, 1995 51 Int. Cl.
(52)
.
cited by examiner
(64) Patent No.: Issued:
(30)
.
5/1992
9/1994
(57)
(JP) ........................................... .. 7-336800
ABSTRACT
Abinarizing Section generates bina?zed data from animage si gnal of a dot code on an information recording medium
G06T 5/00 G06K 9/38 G06K 7/14 G06K 19/06
(2006.01) (2006.01) (2006.01) (2006.01)
read by a code reading section. The binariZing section has a reference dot detection section, a dot area measuring section, a threshold Value modifying section and a threshold Value determining section. The reference dot detection section
G06K 7/10
(2006.01)
binariZes the image signal With a predetermined threshold
US. Cl. .................... .. 382/270; 382/286; 358/328; 235/454; 235/494 Field of Classi?cation Search ............... .. 382/270;
382/286’ 287’ 312’ 317’ 321; 358/465’ 466’ 358/19’ 328’ 470’ 322; 235/494’ 454
See application ?le for Complete Search history (56)
References Cited
Value prior to generating binariZed data to detect a reference dot from a hihan'zed Code image The dot area measuring section measures the area of the reference dot detected by the reference dot detection Section The threshold Value
modifying section modi?es the threshold Value fOl‘ binariZa tion in such a manner that the area measured by the dot area
measuring section approaches a predetermined target Value. The threshold Value determining section binariZes the image signal With the threshold Value modi?ed by the threshold Value modifying section.
U.S. PATENT DOCUMENTS 5,101,096 A
*
3/1992 Ohyama et a1. .......... .. 235/494
14A
23 Claims, 50 Drawing Sheets
14B
:- """ _ ' ‘S__________ "1‘ ____ 7 ‘1
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MEASURING DOT AREA
secnou
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U.S. Patent
Jan. 1, 2008
Sheet 3 0f 50
US RE39,985 E
PATTERN
ADDRESS
IARKER
PATTERN
MARKER
new
001 280
174
nor 278
174
MARKER n4
' ADDRESS DOT 280
DATA 001
282
180 280
DATA AAEA
AARESS no
001' ooos
180 DATA AREA
272
BL
F l G. 3 PRIOR ART
272
U.S. Patent
DOT
Jan. 1, 2008
Sheet 4 0f 50
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US RE39,985 E
16
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U.S. Patent
Jan. 1, 2008
E
THRES-IIQLD _ _
IMAGE SIGNAL
Sheet 5 0f 50
1340
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US RE39,985 E
_ _ - _ U‘IBINARIZED
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CODE IMAGE
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MODIFICA _. TION 0F
THRESHOLD VALUE I
DETERMINA-
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FIG.6B
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U.S. Patent
Jan. 1, 2008
Sheet 6 0f 50
I4I
US RE39,985 E
14A
14B
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THRESHOLD VALUE
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U.S. Patent
FRAME
Jan. 1, 2008
Sheet 7 0f 50
US RE39,985 E
1 8 3 0 THRESHOLD
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F I G. 9A
CODE IMAGE
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F l G. 9B
U.S. Patent
Jan. 1, 2008
Sheet 8 0f 50
US RE39,985 E
FIGIIOA REFERENCEDOT 18
FIGJIOB \DATA CODE
DATA DOT 282
DATA CODE 20
FIGHA kREFERENCE DOT 18 CDATA DOT 282 DATA CODE 20
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U.S. Patent
Jan. 1, 2008
MARKER -——>
Sheet 9 0f 50
MARKER CENTER
DETECTION
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US RE39,985 E
PATTERN DOT ‘
DETECTION
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FIG.I3
FIG.I5 FIG.I4 x x+IX+2x+3
BLACK PIXELIP1 (x, y) ,P2(x+I ,y) , P3(x,y+1).
FIG.I6
U.S. Patent
Jan. 1, 2008
Sheet 10 0f 50
US RE39,985 E
p/PA'ITERN come 22
REFERENCE
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FIG.I7 _
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FIG.I9
U.S. Patent
Jan. 1, 2008
Sheet 11 0f 50
US RE39,985 E
1484
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REFERENCE 001 4: :
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U.S. Patent
Jan. 1, 2008
Sheet 12 0f 50
US RE39,985 E
DETECT REFERENCE DOT
INITIALIZELSS=0
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OF DETECTION CALCULATE AREA si
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U.S. Patent
Jan. 1, 2008 I'
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F I G.
28
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U.S. Patent
Jan. 1, 2008
Sheet 15 0f 50
US RE39,985 E
@ DETECT min AND max
341
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F I G. 29 Amended
846
U.S. Patent
Jan. 1, 2008
Sheet 16 0f 50
US RE39,985 E
LUN I NANCE
F I G
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5
3 0
CODE‘ IMAGE CODE I MAGE
NON-PICKUP PORTION
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OUANT I TY OF
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U.S. Patent
Jan. 1, 2008
Sheet 17 0f 50
US RE39,985 E
CSTART READING ROCESS
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COMPLETE READING
DETECT PEAK VALUE R441 S52
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IMAGE DATA yi
SELECTIVE AVERAGE VALUE CALCULATING SECTION PEAK VALUE DETECTION CIRCUIT l _ _ _ _ __ _;_ _ _ _ _ _I
min. max
F I G. 34
1403a
U.S. Patent
Jan. 1, 2008
Sheet 18 0f 50
US RE39,985 E
IMAGE DATA yi
m
$
COMPLETE
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DETECTION OF
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PEAK VALUE
avg : (yi__1+yi+1 )/2 @864
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max = avg -
avg
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F I G. 35
U.S. Patent
Jan. 1, 2008
Sheet 19 0f 50
TARGET VALUE St
US RE39,985 E
DOT AREA S
I I 11112111012 u|v1s|o11
1111110 momncmou LM14040 AMOUNT TABLE
I AMOUNT Ak OF MODIFICATION OF INTERIOR DIVISION RATIO
F I G. 36A
INTERIOR DIVISION RATIO MODIFICATION AMOUNT TABLE I4C4O st 8 s. o 6. 5 7. o 7. 5 a. o a. s 61) -o.o5 -0.1:1 -0. 20 —0. 28 -0. 37 6. 5 o. 05 -o. 01 -o. 14 —0. 21 —o. 29 7. 0
o. 11
o. 06
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—o. 08 —0. 15 -o. 22
1. 5 o. 17 0. 12 o. 07 -0. 09 —0. 15 8. 0 o. 24 0. 1a 0. 13 0. 0e -0. 1o 8- 5 0. 32 o. 25 o. 19 o. 14 o. 09 1 IF MEASURED DOT AREA IS 7. D AND TARGET VALUE IS 8. 0, THE AMOUNT OF HODIF ICAT ION OF INFERIOR DIVISION RATIO IS Ak = 0. I3 IN ACCORDANCE WITH THE TABLE
F I G. 36B
