CN100340119C - Method and system for correcting uniformity of projection display color - Google Patents

Method and system for correcting uniformity of projection display color Download PDF

Info

Publication number
CN100340119C
CN100340119C CNB2004100256480A CN200410025648A CN100340119C CN 100340119 C CN100340119 C CN 100340119C CN B2004100256480 A CNB2004100256480 A CN B2004100256480A CN 200410025648 A CN200410025648 A CN 200410025648A CN 100340119 C CN100340119 C CN 100340119C
Authority
CN
China
Prior art keywords
value
correcting
brightness
green
blue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB2004100256480A
Other languages
Chinese (zh)
Other versions
CN1595491A (en
Inventor
陈颖
李海峰
刘旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University ZJU
Original Assignee
Zhejiang University ZJU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University ZJU filed Critical Zhejiang University ZJU
Priority to CNB2004100256480A priority Critical patent/CN100340119C/en
Publication of CN1595491A publication Critical patent/CN1595491A/en
Application granted granted Critical
Publication of CN100340119C publication Critical patent/CN100340119C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The present invention discloses a method and a system for correcting the uniformity of projection displaying colors, which uniformly divides a display screen into the correcting areas with the numbers of n1*n2. The present invention has (n1+1) *(n2+1) correcting points, and the brightness variation of red, green and blue of each correcting point is realized by the value of a register in (n1+1) *(n2+1) matrixes corresponding to the three colors in regulating circuits; brightness correcting value is arranged in the register, and the brightness correcting value can be overlapped with the brightness value of video signals of corresponding correcting points together and are used as the output of the video signals; the brightness value of the red, green and blue on each correcting point is collected through CCD, corresponding brightness correcting value is regulated to make the brightness proportion of three primary colors into the same value, and therefore, the uniformity of the colors is in correction. A two-dimensional surface array CCD can be used by the present invention for quickly measuring the output two-dimensional intensity distribution from a projector. By changing the brightness value of the video signals in a small amplitude, the uneven distribution of the colors of the projection display system can be effectively improved.

Description

Color Homogeneity Correction Method Of Projection Display
Technical field
The present invention relates to a kind of Color Homogeneity Correction Method Of Projection Display and system thereof.
Background technology
Along with the continuous development of microelectric technique and liquid crystal process manufacturing technology and the continuous decline of development cost thereof, projection display system more and more has been applied to fields such as military commanding office, enterprise, commerce, scientific research and education and public place of entertainment.Because people are more and more higher to the quality requirement of display frame, therefore the look uniformity of projection display system also receives much concern.In projection display system, because the light beam that incides on the optical thin film is not a directional light, but have the cone-shaped beam of certain angle of divergence, thereby both sides will produce aberration after optical thin film reflection or transmission, thereby cause the inhomogeneous of projector's color.
Summary of the invention
The purpose of this invention is to provide a kind of Color Homogeneity Correction Method Of Projection Display and system thereof.
Bearing calibration: display screen is equally divided into n1 * n2 correcting area, (n1+1) * (n2+1) individual check point is arranged, the brightness of the red, green, blue of each check point change by in the regulating circuit with three colors corresponding (n1+1) * (n2+1) matrix in the value of register realize; What deposit in the register is the correcting luminance value, and the video luminance signal value of these correcting luminance values meetings and corresponding check point is superimposed, as the output of final video signal; By CCD gather red, green, blue on each check point brightness value and regulate corresponding correcting luminance value, make that the brightness ratio of three primary colors is identical, thereby reach the correction that realizes color homogeneity.
Corrective system: it is connected with high accuracy CCD, computer, graphics video signal generator, projector, projection screen in turn, and computer and projector join.
Advantage of the present invention is:
1) utilizes area array CCD can be easy to obtain the two-dimentional Luminance Distribution of projector's output, thereby obtain to measure fast;
2) adopt high accuracy CCD, can reach data and measure accurately;
3) by changing the brightness value of vision signal by a small margin, reach adjusting to the brightness ratio of red, green, blue three looks of projector, can effectively improve the uneven distribution of color, improve the image quality of projection display system.
Description of drawings
Fig. 1 is a projection display color homogeneity corrective system block diagram;
Fig. 2 is a projector architecture schematic diagram of the present invention;
Fig. 3 is Color Homogeneity Correction Method Of Projection Display's flow chart;
Fig. 4 is that projection screen correcting area of the present invention is cut apart schematic diagram;
Fig. 5 is that check point of the present invention is provided with precedence diagram;
Fig. 6 is the flow chart that correction data of the present invention is sent into register.
Embodiment
Color Homogeneity Correction Method Of Projection Display is equally divided into n1 * n2 correcting area with display screen, (n1+1) * (n2+1) individual check point is arranged, each check point red, green, blue brightness change by in the regulating circuit with three colors corresponding (n1+1) * (n2+1) matrix in the value of register realize: be that display screen with 4:3 is equally divided into 32 * 24 or 16 * 12 correcting areas, 33 * 25 or 17 * 13 check points are arranged, each check point red, green, blue brightness change by in the regulating circuit with three colors corresponding 33 * 25 or 17 * 13 matrixes in the value of register realize.
Said display screen is equally divided into n1 * n2 correcting area: the corrected value that is meant the red, green, blue of correcting area is determined by the corrected value linear interpolation of check point around it.
What deposit in the register is the correcting luminance value: be by computer calculate the correction of brightness of red, green, blue write in the register of projector by serial ports or parallel port.Gather the brightness value of red, green, blue on each check point by CCD: be to adopt two-dimensional array CCD that the brightness of projector's output is gathered; Require CCD to place the projection screen front.
Projector is connected with video preprocessor treatment circuit, look even correcting register, drive circuit, display screen, camera lens in turn.
As shown in Figure 1, the present invention mainly comprises computer, high accuracy CCD, graphics video signal generator, projector, projection screen.When the color between two zones of image on projection screen that produced by the graphics video signal generator was inconsistent, its brightness ratio that shows as the red, green, blue three primary colors was inconsistent.By high accuracy CCD gather red, green, blue on each zone on the projection screen brightness value and regulate corresponding correcting luminance value, input to projector by computer by serial ports or parallel port, make that the brightness ratio of three primary colors is identical, thereby realize the correction of color homogeneity.
As shown in Figure 2, projector mainly comprises video preprocessor treatment circuit, look even correcting register, drive circuit, display screen and camera lens.System is equally divided into 32 * 24 or 16 * 12 correcting areas with the display screen of 4:3 among the figure, and 33 * 25 or 17 * 13 check points are arranged.The brightness of the red, green, blue of each check point change can by in the regulating circuit with three colors corresponding 33 * 25 or 17 * 13 matrixes in the value of register realize.That deposits in these registers is mainly the correcting luminance value, these correcting luminance values can and being superimposed of corresponding check point through the pretreated video luminance signal value of video, control exporting by drive circuit again as the final video signal by camera lens.
As shown in Figure 3, the uniform process of automatic correcting colour of system is as follows: the signal that is produced red, green, blue three looks by the timesharing of computer control graphics video signal generator, measure the gray value (being brightness value) of red, green, blue three looks that project on the screen respectively by CCD, and calculate the ratio between red, green, blue three looks and the size of corresponding inhomogeneities thus, obtain the correction of red, green, blue brightness, promptly 33 * 25 or 17 * 13 correction matrix is written in the register of projector by serial ports or parallel port by computer then.Proofread and correct later image and measure by CCD once more, to determine whether proofread and correct later uniformity satisfies pre-provisioning request; To continue computed correction on this basis as not satisfying, till reaching desired color homogeneity.
As shown in Figure 4, whole projection screen is equally divided into 32 * 24 or 16 * 12 correcting areas, and 33 * 25 or 17 * 13 check points are arranged.Each check point all has three registers to be used for storing the corrected value of r, g, three colors of b, and the corrected value of the r of correcting area, g, b is determined by the corrected value linear interpolation of check point around it.
As shown in Figure 5, represented the order setting of 33 * 25 or 17 * 13 check points among the figure.Corrected value will be delivered in 33 * 25 or 17 * 13 registers according to the order of this check point.
As shown in Figure 6, at first be to select correction mode, (selecting 33 * 25 check points or 17 * 13 check points); Gating writes correction data position (this register is write 0 earlier, write 1 again) then; Next data are write R, G, B-register respectively in proper order; Whether last judgment data has been write, and has write and has then finished the input data.

Claims (5)

1. Color Homogeneity Correction Method Of Projection Display, it is characterized in that display screen is equally divided into n1 * n2 correcting area, (n1+1) * (n2+1) individual check point is arranged, the brightness of the red, green, blue of each check point change by in the regulating circuit with three colors corresponding (n1+1) * (n2+1) matrix in the value of register realize; What deposit in the register is the correcting luminance value, and the video luminance signal value of these correcting luminance values meetings and corresponding check point is superimposed, as the output of final video signal; By CCD gather red, green, blue on each check point brightness value and regulate corresponding correcting luminance value, make that the brightness ratio of three primary colors is identical, thereby reach the correction that realizes color homogeneity that wherein, n1 * n2 is 32 * 24 or 16 * 12.
2. a kind of Color Homogeneity Correction Method Of Projection Display according to claim 1, it is characterized in that: said display screen is equally divided into n1 * n2 correcting area, (n1+1) * (n2+1) individual check point is arranged, each check point red, green, blue brightness change by in the regulating circuit with three colors corresponding (n1+1) * (n2+1) matrix in the value of register realize: be that 4: 3 display screen is equally divided into 32 * 24 or 16 * 12 correcting areas, 33 * 25 or 17 * 13 check points are arranged, each check point red, green, blue brightness change by in the regulating circuit with three colors corresponding 33 * 25 or 17 * 13 matrixes in the value of register realize.
3. a kind of Color Homogeneity Correction Method Of Projection Display according to claim 1 is characterized in that: said display screen is equally divided into n1 * n2 correcting area: the corrected value that is meant the red, green, blue of correcting area is determined by the corrected value linear interpolation of check point around it.
4. a kind of Color Homogeneity Correction Method Of Projection Display according to claim 1 is characterized in that: what deposit in the said register is the correcting luminance value: be by computer calculate the correction of brightness of red, green, blue write in the register of projector by serial ports or parallel port.
5. a kind of Color Homogeneity Correction Method Of Projection Display according to claim 1 is characterized in that: said by the brightness value of CCD collection red, green, blue on each check point: as to be to adopt two-dimensional array CCD that acquisition time is carried out in the brightness of the red, green, blue of projector's output; Require CCD to place the projection screen front.
CNB2004100256480A 2004-06-22 2004-06-22 Method and system for correcting uniformity of projection display color Expired - Fee Related CN100340119C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2004100256480A CN100340119C (en) 2004-06-22 2004-06-22 Method and system for correcting uniformity of projection display color

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2004100256480A CN100340119C (en) 2004-06-22 2004-06-22 Method and system for correcting uniformity of projection display color

Publications (2)

Publication Number Publication Date
CN1595491A CN1595491A (en) 2005-03-16
CN100340119C true CN100340119C (en) 2007-09-26

Family

ID=34663758

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2004100256480A Expired - Fee Related CN100340119C (en) 2004-06-22 2004-06-22 Method and system for correcting uniformity of projection display color

Country Status (1)

Country Link
CN (1) CN100340119C (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2298223C2 (en) * 2005-04-25 2007-04-27 Самсунг Электроникс Ко., Лтд. System and method for correcting dark tones on digital photographs
CN100417199C (en) * 2005-11-08 2008-09-03 普立尔科技股份有限公司 A digital camera and its method to correct brightness
US8098265B2 (en) * 2008-10-10 2012-01-17 Ostendo Technologies, Inc. Hierarchical multicolor primaries temporal multiplexing system
CN101854558B (en) * 2010-05-18 2012-04-18 大连海事大学 Method for correcting color domain in treating video signals of LED display screen
CN102026003B (en) * 2010-12-24 2012-08-29 广东威创视讯科技股份有限公司 Method for correcting colors of multi-screen splicing wall
CN102280097B (en) * 2011-08-31 2013-02-13 广东威创视讯科技股份有限公司 Display brightness and chrominance uniformity regulating method
CN103139575A (en) * 2011-11-28 2013-06-05 万正彪 Image processing device capable of achieving multiple-screen image displaying and processing method thereof
TWI639151B (en) 2013-03-15 2018-10-21 美商傲思丹度科技公司 Dynamic gamut display systems, methods, and applications thereof
CN103150986B (en) * 2013-03-20 2015-04-08 长春希达电子技术有限公司 Method for collecting and calibrating multiple cameras of LED (Light-Emitting Diode) display screen
CN107111995B (en) * 2014-10-03 2019-08-23 夏普株式会社 Image processor, display device, configuration decision maker, configuration determination method, recording medium
CN105611259B (en) * 2015-12-17 2017-12-29 苏州佳世达光电有限公司 LCD projector color uniformity method of adjustment and adjusting apparatus
CN106500969B (en) * 2016-11-17 2019-07-26 深圳Tcl新技术有限公司 Display screen homogeneity testing method and display screen uniformity test system
CN108737806B (en) * 2018-08-30 2020-05-08 Oppo广东移动通信有限公司 Projector color correction method and device and computer storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1308465A (en) * 1999-12-18 2001-08-15 Lg电子株式会社 Image distortion correcting deivce and method and image display
US6558006B2 (en) * 2000-08-29 2003-05-06 Olympus Optical Co., Ltd. Image projection display apparatus using plural projectors and projected image compensation apparatus
US20030164927A1 (en) * 2002-03-01 2003-09-04 Nec Corporation Color correction method and device for projector
CN2704170Y (en) * 2004-06-22 2005-06-08 浙江大学 Apparatus for improving projection display colour homogeneity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1308465A (en) * 1999-12-18 2001-08-15 Lg电子株式会社 Image distortion correcting deivce and method and image display
US6558006B2 (en) * 2000-08-29 2003-05-06 Olympus Optical Co., Ltd. Image projection display apparatus using plural projectors and projected image compensation apparatus
US20030164927A1 (en) * 2002-03-01 2003-09-04 Nec Corporation Color correction method and device for projector
CN2704170Y (en) * 2004-06-22 2005-06-08 浙江大学 Apparatus for improving projection display colour homogeneity

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
液晶投影显示的色纯度和色均匀性 郑臻荣 顾培夫,光电工程,第29卷第5期 2002 *

Also Published As

Publication number Publication date
CN1595491A (en) 2005-03-16

Similar Documents

Publication Publication Date Title
CN100340119C (en) Method and system for correcting uniformity of projection display color
CN105244007B (en) A kind of generation method and device of the grayscale correction chart of camber display screen
US8692761B2 (en) Apparatus and method for modeling the light field of a local-dimming LED backlight for an LCD display
CN108492776B (en) Intelligent external optical compensation method for AMOLED screen brightness unevenness
US9135864B2 (en) Systems and methods for accurately representing high contrast imagery on high dynamic range display systems
CN104715731B (en) Screen brightness adjustment method and device and liquid crystal display device
US20180011365A1 (en) High dynamic range displays using filterless LCD(s) for increasing contrast and resolution
CN101692326B (en) System and method for on-site point-by-point calibration of brightness and chrominance of the whole screen of LED display screen
CN100449601C (en) Display control apparatus and method
US20120224121A1 (en) High Dynamic Range Displays Using Filterless LCD(s) For Increasing Contrast And Resolution
US20020180727A1 (en) Shadow buffer control module method and software construct for adjusting per pixel raster images attributes to screen space and projector features for digital warp, intensity transforms, color matching, soft-edge blending, and filtering for multiple projectors and laser projectors
US7821474B2 (en) Rendering luminance levels of a high dynamic range display
CN108922481B (en) Demura implementation method based on side viewing angle of liquid crystal display television
CN103295553A (en) Direct type backlight luminance compensation method and display device
WO2019119606A1 (en) Display apparatus drive method, drive apparatus, and display apparatus
CN104616631B (en) Display method and device for MVA (multi-domain vertical alignment) wide viewing angle LCD (liquid crystal display) screen
CN102479496A (en) Local dimming method and liquid crystal display
JP2011017910A (en) Liquid crystal display device
CN102298894A (en) display device and contrast enhancement method thereof
US20080246882A1 (en) Nonlinear processing device and image display apparatus
CN110087003A (en) More exposure image fusion methods
US20110050760A1 (en) Image display apparatus and control apparatus and integrated circuit thereof
CN102263969A (en) Video signal processing apparatus, video signal processing method, and computer program
CN2704170Y (en) Apparatus for improving projection display colour homogeneity
CN108198220A (en) A kind of optical camera image surfaces method for precisely marking

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
EE01 Entry into force of recordation of patent licensing contract

Assignee: Keting Optical Tech. Co., Ltd., Hangzhou

Assignor: Zhejiang University

Contract fulfillment period: 2007.10.8 to 2013.12.31 contract change

Contract record no.: 2008330000348

Denomination of invention: Method and system for correcting uniformity of projection display color

Granted publication date: 20070926

License type: Exclusive license

Record date: 2008.9.3

LIC Patent licence contract for exploitation submitted for record

Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.10.8 TO 2013.12.31

Name of requester: HANGZHOU KETING OPTICAL TECHNOLOGY CO.

Effective date: 20080903

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20070926

Termination date: 20110622

C17 Cessation of patent right