WO2014162555A1 - Dispositif d'affichage, dispositif, procédé et programme de correction d'échelle de gris - Google Patents

Dispositif d'affichage, dispositif, procédé et programme de correction d'échelle de gris Download PDF

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Publication number
WO2014162555A1
WO2014162555A1 PCT/JP2013/060309 JP2013060309W WO2014162555A1 WO 2014162555 A1 WO2014162555 A1 WO 2014162555A1 JP 2013060309 W JP2013060309 W JP 2013060309W WO 2014162555 A1 WO2014162555 A1 WO 2014162555A1
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WO
WIPO (PCT)
Prior art keywords
unit
luminance
value
correction
display
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Application number
PCT/JP2013/060309
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English (en)
Japanese (ja)
Inventor
勝之 松井
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
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Priority to PCT/JP2013/060309 priority Critical patent/WO2014162555A1/fr
Publication of WO2014162555A1 publication Critical patent/WO2014162555A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00—Specific applications
    • G09G2380/08—Biomedical applications

Definitions

  • the present invention particularly relates to a display device, a gradation correction device, a gradation correction method, and a gradation correction program suitable for use in medical applications.
  • the DICOM gradation characteristic is defined as a luminance value with respect to a JND (Just Noticeable Difference) index value.
  • the JND index value is an input value in which one step is a human luminance discrimination area.
  • a high luminance characteristic is required in order to efficiently find a fine lesion.
  • GSDF Gramscale Standard Display Function
  • DICOM DICOM
  • a display device for medical use is required to have gradation characteristics that match the DICOM curve.
  • the maximum error between the gradation characteristic curve of the display device and the DICOM curve is called MaxGSDF ErrorRate.
  • gradation characteristics are calibrated so that gradation characteristics that match the DICOM curve can be obtained.
  • gamma characteristics are set in advance based on the set unique JND index value.
  • the luminance value is detected by the JND index value of the eigenvalue.
  • the power of the backlight is adjusted so that the detected luminance value at the eigenvalue JND index value matches the luminance value on the DICOM curve.
  • a display device for medical use is required to achieve both high luminance display and high accuracy display. Specifically, it is desired that a high JND index value can be input and MaxGSDF ErrorRate is low.
  • the present invention provides a display device, a gradation correction device, a gradation correction method, and a gradation correction program capable of achieving both high luminance display and high accuracy display. With the goal.
  • a display device that is one embodiment of the present invention drives a display unit that displays an image, a light irradiation unit that irradiates backlight light to the display unit, and a light irradiation unit with a fixed value.
  • Drive unit screen luminance detection unit for detecting a luminance value corresponding to the luminance of the display unit, gradation correction unit for correcting gradation characteristics of the input video signal, and screen luminance detection unit detected at a predetermined cycle
  • a correction value calculation unit configured to calculate a gradation correction characteristic based on the luminance value and set the gradation correction unit.
  • a gradation correction device includes a screen luminance detection unit that detects a luminance value corresponding to the luminance of the display unit when the light source of the display unit is driven with a fixed value.
  • a gradation correction unit that corrects the gradation characteristic of the input video signal, and a correction value calculation unit that calculates the gradation correction characteristic based on the luminance value in a predetermined cycle and sets the gradation correction unit. It is characterized by that.
  • the gradation correction method drives the light for the display portion with a fixed value and corresponds to the luminance of the display portion when the light source of the display portion is driven with a fixed value. And a tone correction characteristic is calculated on the basis of the luminance value at a predetermined cycle, and tone correction of the input video signal is performed.
  • a gradation correction program includes a step of driving light to a display unit with a fixed value, and a luminance of the display unit when the light source of the display unit is driven with a fixed value. And a step of calculating a gradation correction characteristic based on the luminance value in a predetermined cycle.
  • FIG. 1 is a block diagram showing the basic configuration of the present invention.
  • the basic configuration of the present invention includes a display unit 501, a light irradiation unit 502, a drive unit 503, a luminance detection unit 504, a gradation correction unit 505, and a correction value calculation unit 506. It has.
  • Display unit 501 displays an image.
  • the light irradiation unit 502 is a light source of the display unit 501.
  • the drive unit 503 drives the light irradiation unit 502 with a fixed value.
  • the luminance detection unit 504 detects a luminance value corresponding to the luminance of the display unit 501.
  • a gradation correction unit 505 corrects gradation characteristics of the input video signal.
  • the correction value calculation unit 506 calculates a gradation correction characteristic based on the luminance detection value detected by the luminance detection unit 504 and sets the gradation correction characteristic in the gradation correction unit 505.
  • FIG. 2 is a block diagram illustrating a configuration of the display device according to the present embodiment.
  • the display device 1 according to the present embodiment includes an input unit 11, a gamma correction unit 12, a reference video generation unit 13, a display unit 14, a backlight 15, and a backlight driving unit 16. And a screen brightness detector 17 and a correction value calculator 18.
  • the input unit 11 inputs a video signal from the external device 2.
  • This input video signal is a video signal of an image for medical diagnosis, for example, an image such as CT (Computed Tomography) or MRI (magnetic resonance Imaging).
  • the gamma correction unit 12 performs gradation correction on the input video signal so as to conform to the DICOM curve.
  • FIG. 3 shows the gradation characteristics determined by DICOM.
  • the horizontal axis indicates the JND index value
  • the vertical axis indicates the luminance (cd / m 2 ).
  • FIG. 4 shows the correspondence between JND index values and luminance.
  • the gamma correction unit 12 corrects the gradation of the input video signal so that the gradation of the displayed video signal becomes the gradation characteristic of the DICOM curve shown in FIGS.
  • the gamma correction value in the gamma correction unit 12 is set by the correction value calculation unit 18.
  • the reference image generation unit 13 generates a reference image signal such as white.
  • the display unit 14 displays an image corresponding to the video signal input to the input unit 11 or the reference video signal generated from the reference video generation unit 13.
  • an LCD Liquid Crystal Display
  • the backlight 15 irradiates the display unit 14 with backlight light.
  • the backlight drive unit 16 drives the backlight 15. In the present embodiment, the backlight drive unit 16 drives the backlight 15 with a fixed value that maximizes the optical power, for example.
  • the screen brightness detection unit 17 detects the screen brightness of the display unit 14.
  • the screen luminance detection unit 17 is attached to the end of the screen so as not to obstruct display.
  • the display unit 14 displays the white test signal in a small area including the detection area of the screen brightness detection unit 17.
  • the correction value calculation unit 18 determines a JND index value corresponding to the luminance value from the luminance value detected by the screen luminance detection unit 17, and uses the JND index value corresponding to the luminance value as the maximum luminance value, so that the DICOM curve A gamma correction value, which is a tone correction characteristic that satisfies the following, is calculated and set in the gamma correction unit 12.
  • FIG. 5 is a flowchart of gradation characteristic correction processing in the display device according to the present embodiment.
  • the backlight driving unit 16 sets the backlight 15 to the maximum power during the display operation (step S1).
  • the reference video generation unit 13 displays a white image in a small area including the detection area of the screen luminance detection unit 17 provided at the end of the display unit 14 (step S2). This white image may be displayed constantly.
  • the screen brightness detection unit 17 detects the screen brightness of the display unit 14 when the backlight 15 is driven at the maximum power (step S3). Note that the luminance detection may be always performed.
  • the correction value calculation unit 18 determines a JND index value corresponding to the detected value of luminance from the detected value of the luminance of the screen of the display unit 14 when the backlight 15 is driven at the maximum power by using a DICOM curve (Step S1). S4).
  • the detected value of the luminance of the display unit 14 when the backlight 15 is driven at the maximum power and a white image is displayed on the display unit 14 is 933 cd / m 2 .
  • the correction value calculation unit 18 sets the determined JND index value as the maximum luminance value, calculates a gamma characteristic that matches the DICOM curve (step S5), and sets it in the gamma correction unit 12 (step S6). .
  • a calculation method for obtaining the gamma characteristic is known, and is described in, for example, Patent Document 1.
  • the above-described processing is repeatedly executed at a predetermined cycle during the display operation. That is, the processing from step S4 to step S6 is repeatedly executed at a predetermined cycle. Since the change in luminance with time is relatively slow, the predetermined period is, for example, one hour. Steps S2 and S3 may be performed all the time, or may be performed at a cycle shorter than a predetermined cycle.
  • the backlight drive unit 16 drives the backlight 15 with the eigenvalue of the maximum power
  • the screen brightness detection unit 17 drives the backlight 15 with the maximum power.
  • the brightness is detected.
  • the correction value calculation unit 18 determines the JND index value corresponding to the luminance value from the detected luminance value, sets the JND index value corresponding to the luminance value as the maximum luminance value, and sets the JND index value to the DICOM curve.
  • a gamma correction value that matches is calculated.
  • FIG. 6 shows a calibration by using a unique JND index value to set a gamma correction value in advance, and adjusting the backlight power so that the detected luminance value matches the luminance value in the DICOM curve, thereby correcting the gradation. It is an example of a structure of the display apparatus which performs.
  • 2 includes the input unit 11, the gamma correction unit 12, the reference video generation unit 13, the display unit 14, the backlight 15, the backlight driving unit 16, the screen luminance detection unit 17, and the correction value calculation.
  • a video signal from the external device 102 is input to the input unit 111.
  • the correction value setting unit 118 sets a unique JND index value at the time of calibration, obtains a gamma characteristic that matches the DICOM curve, and sets it in the gamma correction unit 112 in advance. Therefore, the gamma characteristic of the gamma correction unit 112 is a fixed value. Then, during the display operation, the screen luminance detection unit 117 detects the luminance value of the display unit 14 with the unique JND index value, and the backlight driving unit 116 converts the luminance detection value into the luminance value on the DICOM curve. The power of the backlight 115 is adjusted so as to match. Therefore, the power of the backlight 115 is changed following the detected luminance value.
  • the display device 1 according to the present invention shown in FIG. 2 drives the backlight 15 at a fixed value that provides the maximum power.
  • the screen luminance detection unit 17 detects the luminance of the screen of the display unit 14, and the correction value calculation unit 18 determines a JND index value corresponding to the luminance value from the luminance value detected by the screen luminance detection unit 17. . Then, the correction value calculation unit 18 sets the determined JND index value as the maximum luminance value, obtains a gamma characteristic that matches the DICOM curve, and sets it in the gamma correction unit 12. Therefore, the characteristic of the gamma correction unit 12 is changed following the detected luminance value.
  • the horizontal axis indicates the usage time
  • the vertical axis indicates the luminance converted with the JND index value.
  • the gamma correction unit 112 is set.
  • the display device 101 as shown in FIG. 6 cannot increase the eigenvalue of the JND index set as the maximum value when performing calibration, and it is difficult to achieve both high luminance display and high accuracy display. .
  • high luminance display is possible at the beginning, but due to the luminance deterioration, for example, about 30,000.
  • MaxGSDF ErrorRate will exceed 10%.
  • the display device 1 according to the embodiment of the present invention can display up to the maximum luminance at which the backlight 15 has the maximum power, and can perform high luminance display.
  • the display device 1 according to the embodiment of the present invention detects the luminance of the screen at a predetermined cycle, determines the JND index value corresponding to the detected luminance, and calculates the gamma characteristic. Therefore, even if the characteristics of the display device 1 change due to changes over time, the gamma characteristics of the gamma correction unit 12 are changed according to the change characteristics. For this reason, MaxGSDF ErrorRate does not deteriorate significantly due to a change with time.
  • the maximum luminance value when calculating the gamma correction value is always a JND index value corresponding to the luminance value when the backlight 15 has the maximum power. .
  • the display device 1 according to the present embodiment enables high-luminance display.
  • the gamma characteristic of the gamma correction unit 12 is updated following the detected luminance value of the display unit 14. For this reason, even if the luminance characteristics of the display unit 14 deteriorate due to a change over time, the MaxGSDF ErrorRate does not deteriorate and high-precision display can be maintained. Further, in the display device 1 according to the present embodiment, since the gamma characteristic of the gamma correction unit 12 is updated according to the decrease in luminance, recalibration is unnecessary.
  • JND index 670
  • the display device 1 according to the present embodiment can achieve both high luminance display and high accuracy display.
  • the backlight 15 is set to a fixed value of the maximum power.
  • the fixed value set to the backlight 15 may not be the maximum power, and may be a constant value or a temperature limit value. .
  • the screen brightness detection unit 17 detects the brightness of the display unit 14.
  • the brightness of the backlight 15 may be detected.
  • luminance of the backlight 15 a white screen is unnecessary.
  • a program for realizing the control function is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed by the computer system. Also good.
  • This computer system includes an operating system (OS) and hardware of peripheral devices.
  • the computer-readable recording medium is a portable recording medium such as a flexible disk, a magneto-optical disk, an optical disk, or a memory card, and a storage device such as a magnetic hard disk or a solid state drive provided in the computer system.
  • a computer-readable recording medium holds a program dynamically for a short time, such as a computer network such as the Internet, and a communication line when transmitting a program via a telephone line or a cellular phone network.
  • a server that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server device or a client in that case, may be included.
  • the above program may be for realizing a part of the above-described functions, and further, may be realized by combining the above-described functions with a program already recorded in the computer system. Good.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention est dotée d'une unité d'affichage (501), d'une unité d'irradiation lumineuse (502), d'une unité d'excitation (503), d'une unité de détection de luminosité (504), d'une unité de correction d'échelle de gris (505) et d'une unité de calcul de valeur de correction (506). L'unité d'affichage (501) affiche des images. L'unité d'irradiation lumineuse (502) irradie l'unité d'affichage (501) avec de la lumière. L'unité d'excitation (503) excite l'unité d'irradiation lumineuse (502) à une valeur fixe. L'unité de détection de luminosité (504) détecte la luminosité de l'unité d'affichage (501). L'unité de correction d'échelle de gris (505) corrige la caractéristique d'échelle de gris d'un signal vidéo en entrée. L'unité de calcul de valeur de correction (506) calcule la caractéristique de correction d'échelle de gris sur la base de la valeur de détection de luminosité détectée par l'unité de détection de luminosité (504) et fixe la caractéristique de correction d'échelle de gris dans l'unité de correction d'échelle de gris (505).
PCT/JP2013/060309 2013-04-04 2013-04-04 Dispositif d'affichage, dispositif, procédé et programme de correction d'échelle de gris WO2014162555A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019159266A1 (fr) * 2018-02-14 2019-08-22 Eizo株式会社 Système et programme d'affichage
WO2022168171A1 (fr) * 2021-02-02 2022-08-11 Eizo株式会社 Système d'affichage d'image, dispositif d'affichage d'image, procédé d'affichage d'image et programme informatique

Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2002102176A (ja) * 2000-09-29 2002-04-09 Fuji Photo Film Co Ltd 医用画像表示システム
WO2009104584A1 (fr) * 2008-02-21 2009-08-27 コニカミノルタエムジー株式会社 Système de contrôle de qualité et programme de contrôle de qualité de système d'affichage d'images
JP2013033211A (ja) * 2011-06-30 2013-02-14 Canon Inc 表示装置及びその制御方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002102176A (ja) * 2000-09-29 2002-04-09 Fuji Photo Film Co Ltd 医用画像表示システム
WO2009104584A1 (fr) * 2008-02-21 2009-08-27 コニカミノルタエムジー株式会社 Système de contrôle de qualité et programme de contrôle de qualité de système d'affichage d'images
JP2013033211A (ja) * 2011-06-30 2013-02-14 Canon Inc 表示装置及びその制御方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019159266A1 (fr) * 2018-02-14 2019-08-22 Eizo株式会社 Système et programme d'affichage
CN111557028A (zh) * 2018-02-14 2020-08-18 Eizo株式会社 显示系统以及程序
JPWO2019159266A1 (ja) * 2018-02-14 2021-01-28 Eizo株式会社 表示システム及びプログラム
US11056079B2 (en) 2018-02-14 2021-07-06 Eizo Corporation Display system and program
WO2022168171A1 (fr) * 2021-02-02 2022-08-11 Eizo株式会社 Système d'affichage d'image, dispositif d'affichage d'image, procédé d'affichage d'image et programme informatique
JP7361958B2 (ja) 2021-02-02 2023-10-16 Eizo株式会社 画像表示システム、画像表示装置、画像表示方法及びコンピュータプログラム
US11935455B2 (en) 2021-02-02 2024-03-19 Eizo Corporation Image display system, image display device, image display method, and computer program

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