(54) DATA GENERATION METHOD AND DATA (56) References Cited GENERATION APPARATUS U.S. PATENT DOCUMENTS
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1 US B2 (12) United States Patent Omagari et a]. (10) Patent N0.: (45) Date of Patent: US 8,792,134 B2 Jul. 29, 2014 (54) DATA GENERATON METHOD AND DATA (56) References Cited GENERATON APPARATUS U.S. PATENT DOCUMENTS (71) Applicant: Canon Kabushiki Kaisha, Tokyo (JP) 7,035,559 B2 * 4/2006 Tanaka et a / ,486,410 B2 * 2/2009 Hisamura /1.12 (72) nventors 7,486,414 B2 * 2/2009 Arai /19 2 _ 7,529,006 B2 * 5/2009 tagaki et a /519 Kawasakl (JP); Yutaka Hiyama, Kawasaki (JP) (73) Assignee: Canon Kabushiki Kaisha, Tokyo (JP) JP A 1/1998 JP A 2/2005 JP A 5/2005 ( * ) Notice: Subject to any disclaimer, the term of this JP A 12/2005 tent is extended or ad'usted under 35 JP /2006 Pa 1 JP A 6/2009 U-S-C- 154(b) by 38 days- JP A 4/2010 JP A 8/2011 (21) Appl. N0.: 13/725,639 * c1ted by exammer (22) Filed: Dec. 21, 2012 Primary Examiner * Charlotte M Baker (65) Prior Publication Data (74) Attorney, Agent, 0rFirm * Canon USA nc lp Division US 2013/ A1 Jul. 4, 2013 (57) ABSTRACT (30) Foreign Application Priority Data Conventional calibration patches are designed such that gra dation values of the patches are determined, based on the D60. 28, (W0)..... PCT/JPZOl 1/ overall length ofa trajectory ofa monochrome ink color in an L*a*b* space, so that distances between patches become (51) nt- Cl- uniform, and therefore provide low interpolation accuracy in G06K 15/00 ( ) a region where measurement values change non-linearly in H 04N 1/46 ( ) accordance with the change in gradation. G03F 3/08 ( ) According to the present invention, gradation values of H 04N 1/60 ( ) patches to be used for color calibration are determined so that G06K 9/00 ( ) the patches are closely arranged in a region where measure (52) U-s- Cl- ment values change non-linearly in accordance with the..... change in gradatiol Thus, interpolation accuracy can be 382/162; 382/167 improved in a region where measurement values change non (58) Field of Classi?cation Search linearly. USPC /21, 504, 518, 1.9; 382/162, 167 See application?le for complete search history. 11 Claims, 21 Drawing Sheets PRNTERDRJVER 202 /\/ [d202, p304 COLOR COLOR 1Cng OUTPUTY LCM CMYK RGB RGB C m y c m y HALFTONE LchG BNAR 10?g > MATCHNG > SEPARATON > > PROCESSNG W Y) > PRJNTER PROCESSJNG PROCESSNG W 0111 ENGNE UNT A ll OUTPUTyCORRECTON COLOR MATCHNG TABLE GROUP COLOR SEPARATON TABLE GROUP TABLEGROUP 11 COLOR CAUBRATJON 205 CORRECTJON VALUE CORRECTON VALUE APPLCATON UNT CALCULATON UNT C/
2 US. Patent Jul. 29, 2014 Sheet 1 0f 21 US 8,792,134 B2 FG PC 112 J " PRNTER OPERATON COMPUTATON T UNT PRNTNG UNT H 101 STORAGE DEVCE AWE,qu 1 13 PATCH GRADATON f" DETERMNATON PROGRAM PRNTER DRVER COLOR CALBRATON PROGRAM DATA NPUT/OUTPUT SETH/RY COLORlMETER DEVCE
3 US. Patent Jul. 29, 2014 Sheet 2 0f 21 US 8,792,134 B2 wow \/\ v25 55 V220 SML m3<>205 8 m2<>zoe 8 V z@_20_ < :23 :2: N Emilsz 50% mg;.@_u_ N z?mw?mg $55553 M76521 mom ZHZE A 95 ng 925%? wzazm :2: : wow Pow :23 #81849: Zogimw NEED E?
4 US. Patent Jul. 29, 2014 Sheet 3 0f 21 US 8,792,134 B2 FG. 3 DETERMNATON OF PATCH GRADATON VALUE S301 m PRNT MONOCHROMATC PATCH CHART OF 0 TO 255 GRADATONS FOR EACH NK COLOR 8302 PERFORM COLOR MEASUREMENT ON PATCH CHART S303 NORMALZE MEASUREMENT VALUE CORRESPONDNG TO EACH OF L* AXS a* AXS, AND b* AXS ON L*a*b* SPACE 8304 CALCULATE COLOR DFFERENCE AEA FOR ONE GRADATON(n =0 T0254) 8305,» CALCULATE AEall = EAEn BY TOTALNG COLOR DFFERENCES FOR ALL GRADATONS CALCULATE COLOR DFFERENCE S306 AEp = AEalllM PER PATCH (M: PREDETERMNED NUMBER OF PATCHES PER COLOR) PRELMNARLY DETERMNE PATCH GRADATON VALUES so 8307 THAT CCLCR DFFERENCE AEm BETWEEN ADJACENT PATCHES BECOMES SUBSTANTALLY EQUAL TO AEp 8308/» CORRECT PATCH GRADATON VALUE < >
5 US. Patent Jul. 29, 2014 Sheet 4 or 21 US 8,792,134 B2 FG. 4
6 US. Patent Jul. 29, 2014 Sheet 5 0f 21 US 8,792,134 B2 FG. 5A
7 US. Patent Jul. 29, 2014 Sheet 6 0f 21 US 8,792,134 B2 FG. SB
8 US. Patent Jul. 29, 2014 Sheet US 8,792,134 B2 FG. 6 Lit aft bi: Lit, air, b'k AEn TOTAL ONE PATCH 0.150
9 US. Patent Jul. 29, 2014 Sheet 8 0f 21 US 8,792,134 B2 FG. 7 MODFCATON OF PATCH GRADATON VALUE DETERMNE EVALUATON VALUE Xm FROM AMOUNT OF CHANGE 8701» N MEASUREMENT VALUE (AMOUNT OF THREE-DMENSONAL VECTOR DSTORTON) N ADJACENT AE UNFORM PATCHES (m = TO 16) 3702 CALCULATE CORRECTON COEFFCENT n (n =0 T0255) S703 CORRECT COLOR DFFERENCE AEn OF ONE GRADATON USNG CORRECTON COEFFCENT n, AND OBTAN AEn' CALCULATE AE ' = ZAE ' BY TOTALNG COLOR S704 DFFERENCES FOR ALL GRADATONS CALCULATE COLOR DFFERENCE AEp' = AEall'lM PER PATCH (M: PREDETERMNED NUMBER OF PATCHES PER COLOR) RE-DETERMNE PATCH GRADATON VALUES SO THAT COLOR S706 DFFERENCE AEm' BETWEEN ADJACENT PATCHES BECOMES SUBSTANTALLY EQUAL TO AEp < >
10 US. Patent Jul. 29, 2014 Sheet 9 0f 21 US 8,792,134 B2 FG. 8A FG. 8B Xm
11 US. Patent Jul. 29, 2014 Sheet 10 0f 21 US 8,792,134 B2 FG. 9 GRADATON AMOUNT OF CORRECTON PATCH m VALUE BEFORE L* a* b* DSTORTON COEFFCENT MODFCATON Xm n
12 US. Patent Jul. 29, 2014 Sheet US 8,792,134 B2 FG. 10 CORRECTON COEFFCENT n O GRADATON VALUE
13 US. Patent Jul. 29, 2014 Sheet 12 0f 21 FG. 1 1 US 8,792,134 B2 CORRECTON COLOR GRWFJEON COEFEHCENT DFFAESENCE BEFMgQFTED TOTAL ONE PATCH 0.223
14 US. Patent Jul. 29, 2014 Sheet 13 or 21 US 8,792,134 B2 FG. 12 P VALUE U 8* v
15 US. Patent Jul. 29, 2014 Sheet 14 0f 21 US 8,792,134 B2 FG. 13A Cyan a* b* GRADATON 16-GRADATON _o_ 16-GRADATON MEASUREMENT VALUE UNFORM PATCH MODFED PATCH /+ 0.8 E? 0.6 b* 0.5 0' : 0.1. k 0,0 Mu-WW
16 US. Patent Jul. 29, 2014 Sheet 15 0f 21 US 8,792,134 B2 FG. 13B Cyan a* -L* GRADATON 6-GRADATON _o_ 16-GRADATON MEASUREMENT VALUE UNFORM PATCH MODFED PATCH ' a*
17 US. Patent Jul. 29, 2014 Sheet 16 0f 21 US 8,792,134 B2 FG. 13C Cyan b* -L* GRADATON 16-GRADATON _o_ 16-GRADATON MEASUREMENT VALUE UNFORM PATCH MODFED PATCH
18 US. Patent Jul. 29, 2014 Sheet 17 0f 21 US 8,792,134 B2 FG. 14 QQQQQ
19 US. Patent Jul. 29, 2014 Sheet 18 0f 21 US 8,792,134 B2 FG * BEFORE 256-GRADATON x AFTER 256-GRADATON NORMALZATON NORMALZATON Mae-k" X x x M
20 US. Patent Jul. 29, 2014 Sheet US 8,792,134 B2 FG. 16A 1.0 r: GRADATON D 16-GRADATON MEASUREMENT VALUE UNFORM PATCH 0.7 " 0.6 "1., PM?" b*
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