(12) ulllted states patent (10) patent n0.: us 7,706,604 b2 berns … · date: dec. 6, 2002, patent...

US007706604B2

(12) Ulllted States Patent (10) Patent N0.: US 7,706,604 B2 Berns et a]. (45) Date of Patent: Apr. 27, 2010

(54) PRODUCTION OF COLOR CONVERSION 7,046,394 B2 * 5/2006 Yasunobu ................. .. 358/ 1.9

PROFILE FOR PRINTING 7,053,910 B2* 5/2006 Newman 345/604 7,133,154 B2 * 11/2006 Sugiyama ................. .. 358/19

(75) Inventors: Roy S. Berns, Pittsford, NY (US); 200 136209285545‘ * i gemlikata 358/1 13 I 1110 aZu . . . . . . . . . . . . . . . . . .. .

Egg;gfshiil?g’gziRighzig?gggp)_ 2002/0158933 A1 * 10/2002 Yamamoto . 347/15 _ _’ ’ g _ ’ 2003/0016862 A1* 1/2003 Ohga ...... .. 382/162

K1m1t°_Kats“yama’ Nagano'ken (JP), 2003/0035126 A1 * 2/2003 Stone et al. 358/19 Takashl It", NaganO-ken (JP) 2003/0072043 A1 * 4/2003 Hagai et al. ............... .. 358/518

(73) Assignee: Seiko Epson Corporation, Tokyo (JP) (Continued)

( * ) Notice: Subject to any disclaimer, the term of this FOREIGN PATENT DOCUMENTS patent is extended or adjusted under 35 JP l1_26l740 9/1999 U.S.C. 154(b) by 780 days.

(Continued) (21) App1.No.: 10/700,772

OTHER PUBLICATIONS

(22) Flled: NOV‘ 3’ 2003 Y. Chen et al., “A Multi-Ink Color-Separation Algorithm Maximizing _ _ _ Color Constancy,” IS&T/SID Eleventh Color Imaging Conference

(65) Prior Publlcatlon Data (NOV, 2003), pp‘ 271281‘

US 2005/0094871 A1 May 5, 2005 (Continued)

(51) Int. Cl. Primary ExamineriBhavesh M Mehta G06K 9/00 (2006.01) Assistant ExamineriBemard Krasnic G03F 3/08 (2006.01) (74) Attorney, Agent, or FirmiMartine Penilla & H04N 1/46 (2006.01) Gencarella, LLP

(52) US. Cl. ...................... .. 382/162; 358/518; 358/530

(58) Field of Classi?cation Search ............... .. 382/162; (57) ABSTRACT 35 8/5 1 8, 530

See application ?le for Complete Search history In one example, there is designed a system for calculating an _ evaluation index for sample ink amount data from a color

(56) References Clted difference evaluation index and an image quality evaluation

U.S. PATENT DOCUMENTS index, and creating a pro?le based on a highly rated sample. In this system, the printer driver is designed to use different

5,828,781 A * 10/1998 Nakano .................... .. 382/167 indexes to Create pro?les’ and to perfonn Color Conver 5,832,136 A : 11/1998 Hlrese - - - - - - - - ~~ 382/275 sion using these plural pro?les. These plural pro?les may be

2 Q2 * 3331 feel‘ " 34222825‘; selected appropriately according to user needs, printing con 6’888’963 B2 * 5/2005 Nici?giet a ' " "" " 382/l6'7 ditions, type of image targeted for printing, and the like.

6,975,338 B2 * 12/2005 Hirai et al. . . . . . . . . . .. 347/133

6,987,567 B2 * l/2006 Takahashi et a1. ......... .. 356/405 10 Claims, 34 Drawing Sheets

{18 22 05 (19b

ima e data acquiring Display Driver 9 V F Ta = mo ule

RGB data 6 Input evice ,e_ Drlver

Pro?le L21 (made using C") :lselector Color converter

15b~ pro?le1.(Gl) L2o - L L pro?le2.(Gl+T|nk) 33 32

pro?le3.(Tink)

Pro?le data Halftone processor (196 made usin MI) 15°‘ (pro?le1. g 34 USB

I F I/ F HDD Printing data 40

generator

‘~35 Printer Driver '\—/30

Computer

L10

US 7,706,604 B2

US. PATENT DOCUMENTS

2003/0098896 A1 2003/0106461 A1*

5/2003 Berns et al. 6/2003 Sano ..................... .. 106/31.27

2003/0151756 A1* 8/2003 YamaZaki et al. . 358/19 2003/0218656 A1* 11/2003 YamaZaki et al. 347/43 2004/0160614 A1* 8/2004 Komiya et al. .. 358/19 2005/0068550 A1* 3/2005 Braun ......... .. . 358/19

2005/0094169 A1* 5/2005 Berns et al. ................ .. 358/19

FOREIGN PATENT DOCUMENTS

JP 2001-320592 11/2001 JP 2002-354276 12/2002 JP 2003-153015 5/2003 JP 2003-153024 5/2003 JP 2003-303085 10/2003 W0 WO 2005043889 A1 * 5/2005

OTHER PUBLICATIONS

Y. Arai et al., “Color Correction Method Based on the Spectral Re?ectance Estimation using a Neural Network,” The Fourth Color Imaging Conference: Color Science, Systems and Applications (Nov. 19-22, 1996), pp. i-iii and 5-9. Y. Arai et al., “A neural network for correcting the color shifts due to the illuminant changes,” Progress in Neural Information Processing:

Proceedings of the International Conference on Neural Information Processing (Sep. 24-27, 1996), pp. 350-355. Y. Arai et al., “Device-and-illuminant independent color reproduc tion using principal component analysis and neural networks,” Device-Independent Color Imaging II: Proceedings of SPIEiThe International Society for Optical Engineering (Feb. 7-8, 1995), vol. 2414, pp. i-iv and 115-122. Y. Arai et al., “A Color Conversion Method Using a Neural Network for a Cross-Media Color Appearance Matching,” AIC Color 97, Proceedings of the 8th Congress of the International Colour Asso ciation, vol. II (May 25-30, 1997), pp. 566-569. Abstract of Japanese Patent Publication No. 2003 -3 03085, Pub. Date: Oct. 24, 2003, Patent Abstracts of Japan. Abstract of Japanese Patent Publication No. 11-261740, Pub. Date: Sep. 24, 1999, Patent Abstracts of Japan. Abstract of Japanese Patent Publication No. 200 1 -3 20592, Pub. Date: Nov. 16, 2001, Patent Abstracts of Japan. Abstract of Japanese Patent Publication No. JP 2002-354276, Pub. Date: Dec. 6, 2002, Patent Abstracts of Japan. Abstract of Japanese Patent Publication No. JP 2003-153015, Pub. Date: May 23, 2003, Patent Abstracts of Japan. Abstract of Japanese Patent Publication No. JP 2003-153024, Pub. Date: May 23, 2003, Patent Abstracts of Japan.

* cited by examiner

US. Patent Apr. 27, 2010 Sheet 3 of 34 US 7,706,604 B2

Fig.3 L First Embodiment ] Start

v f- 510

Prepare spectral printing model (forward model converter)

v [- S12

Prepare a large number of virtual samples in ink space

v /' S14

Calculate CIELAB values of virtual samples using the spectral printing mndel

v /' S16

Divide the CIELAB space into a plurality of cells and sort all the samples into the different cells

l f 820 Prepare a plurality of reference colors

" /' S22

Measure soectral re?ectance of reference colors

v [- S26

Prepare Data set for GI

/' S30 De?ne evaluation index:

Color lnconstancv Index + lmaqe Qualitv Index

r S35 V

Calculate evaluation index for each sample and select the best sample in each cell

, /' S40

Create a preliminary ink pro?le for ?ner cells using non-uniform interpolation based on selected samples for coarse cells

" f 545

Create a ?nal ink pro?le by uniform interpolation based on previous lookup table

v f'SSO Gamut map to produce printer lookup table

End

US. Patent Apr. 27, 2010 Sheet 4 0f 34 US 7,706,604 B2

OON

00-. .mi

ON

Owl ON Om» OOr ONr Q? .90


Fig.5

parameter data

- X resolution 21440dpi

' Y resolution I720dpi

' number of colors 26

- printing media Iphoto paper

- number of subpixels/ pixel I20

' number of nozzles I180


Fig.6

dot shape data

?rst dot second dot relative distance

__co|or|n0zzle Xsize Ysize Xsize Ysize Xsize Ysize N0 (Yo) (Yo) (X1) (Y1) (X2) (v2) #1 4.6 2.4 0 q Q Q #180 4'2 2'2 0 (5 ('1 (5 #J #100 #1

#1'80 #J #100 #1

C


Fig .7

780

spectral reflectance data

780 400 390 380

0.21 0.25 0.384

US. Patent

Fig.8

Apr. 27, 2010 Sheet 8 0f 34

( Step S35 )

Calculate Cll 1

Select Sample ink amount data in the cell

US 7,706,604 B2

I355

(S60 N" {562 Calculate Ml

N 0 570 —@g% YES

Calculate GI r575

$80

Was Tink7selected YES

Calculate Tink f S85

Calculate Evaluation Index I S90

NO

YES

Select the best Sample in the cell

f 894

< return >

US. Patent Apr. 27, 2010 Sheet 9 of 34 US 7,706,604 B2

Fig.9

( Calculate Cll D

Calculate XYZ for D50 ~/' 5100

Chromatic adaptation _/- S105 transform to D65

CalculateCltELAB I J S110 CV1=(L a b ) D50->065

Calculate XYZ for F11 f 5115

Chromatic adaptation _/- S120 transform to D65

Calculate‘Cl‘ELAB I _/-S125 CV2=(L a b )F11->os5

Calculate Cll J 5130

< return )


Fig.10

( Calculate Gl D

Halftone processing r5150

Acquire Data set for GI r5155

Create a subpixel plane $5160

Create dots on the subpixel ~,_S165 plane using dot shape data

5170 Have all colors

been fanished YES

Calculate the li htness J- 3175 using spectral re ectance

of all colors

E3

US. Patent Apr. 27, 2010 Sheet 11 0134 US 7,706,604 B2

Fig.11

Calculate Minimum frequency of the image eu=X-resolution/ (number of pixels

of X-direction X 25.4) f 5205 ev=Y-resolution/ (number of pixels

of Y-direction X 25.4)

Initialize u and v r5210

VT|:(u'v)=5_05e (-0.13s 11 ~11 1/180) .(1_e (-0.1 11 ~11 f/180) ) x5220

Pow=Pow+ (VTF(u,v)) Z - (Re(u,v) 2 +lm(u,v) 2 ) f 5225

S230

Have all (u,v) NO been finished

YES

Int: J Pow/all of subpixels f 5235

Ave= Z Z L(x,y ’‘ y % pixels [S240

a(L)= ME?) 0'6" f 5245

Gl=a(L) 1111 r5250

( return >


S2. ooc?uocmimbugm 8% a 2m H8 8% 52:23

O

NEE


Fig.14(A) Non-uniform interpolation

Fig.14(B) Fig.14(C) Before non-uniform interpolation After non-uniform interpolation

40

50 l

-50 -100 50 -50

30

20 -

:c: -20 -

-30 -

-40 -

-5O -

-6O -

-70 -100


Iv |v 5:50 cores-85oz 525

Al

/.

1+ 5.524 SE8 Q8 .90

5E8 cozuzuoamm ,1 5.522 5E3 25 .5


Fig.16(A) Spectral Neugebauer model

a6 am fm

II> / _, ac aw 1-fm

% I ‘I // ,1 v

/ \/ \ \ A /

fc 1-fc

Fig.16(B) Murray-Davies model

1

0.9 '

0.8 '

0.7 -

0.6 '

0.5 '

0.4 '

0.3 -

0.2 -

0.1

0

fc

0 0.2 0.4 0.6 0.8 1

dc f c=f1D-LUT(dc )

US. Patent Apr. 27, 2010

Fig.18

Sheet 18 of 34 US 7,706,604 B2

Selected digital counts and area coverages of every ink for Cellular Yule-Nielsen Spectral Neugebauer Model

Digital counts of ink amount

Cyan 0 50 168 255

Magenta 0 56 173 255

Yellow 0 49 162 255

Black 0 56 126 255

Green 0 43 182 255

Orange 0 64 186 255

(12) ulllted states patent (10) patent n0.: us 7,706,604 b2 berns … · date: dec. 6, 2002, patent...

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