EP1055322A1 - Anzeigevorrichtung mit verbesserter graustufendarstellung - Google Patents
Anzeigevorrichtung mit verbesserter graustufendarstellungInfo
- Publication number
- EP1055322A1 EP1055322A1 EP99962179A EP99962179A EP1055322A1 EP 1055322 A1 EP1055322 A1 EP 1055322A1 EP 99962179 A EP99962179 A EP 99962179A EP 99962179 A EP99962179 A EP 99962179A EP 1055322 A1 EP1055322 A1 EP 1055322A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- monitor
- values
- arrangement according
- correction unit
- correction
- 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.)
- Withdrawn
Links
- 238000012937 correction Methods 0.000 claims abstract description 84
- 238000009826 distribution Methods 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 3
- 238000003325 tomography Methods 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 238000010894 electron beam technology Methods 0.000 claims 4
- 238000002591 computed tomography Methods 0.000 claims 2
- 238000003384 imaging method Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Classifications
-
- G06T5/92—
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10116—X-ray image
Definitions
- the invention relates to a display device for displaying gray-scale images with a monitor controlled by s electrode beams.
- images that are used for diagnostic purposes are usually displayed as grayscale images.
- the smallest details are important when presenting these medical images. Therefore, an optimal display with a large number of brightness levels distinguishable by the human eye is sought.
- WO96 / 19899-A3 describes a monochrome monitor which is controlled by three electron guns (triple gun). These three electrode beams are imaged on one point. However, the image information with which these electrode beams are fed is always the same. By controlling a pixel with three electrode beams, high brightness with high sharpness is achieved.
- Monitors have a display curve that differs from the optimal perceptional display curve. Typical monitor curves in the low or darker grayscale range show a resolution of the individual that is too low
- Grayscale Due to the inadequate resolution of the gray levels in this area, different gray levels cannot be distinguished or several different gray levels are displayed with only one gray level value. In order to make these differences of the gray levels visible or to correct them, the brightness distribution or the monitor display curve must be corrected.
- the same number of gray level values is assigned to a corresponding number of gray level values.
- the assignment rule for the correction of the brightness distribution of the monitor or its display curve assigns the same grayscale values of the output video signal to a plurality of grayscale widths of an input video signal, as a result of which a loss of representable grayscale values occurs.
- the object of the invention is therefore to provide the simplest possible device for adapting the brightness distribution of the monitor to the optimal perceptional brightness distribution.
- this object is achieved in that a correction unit for generating s output image signals As, which have gray level values from a set K of correction gray levels, from an image signal which contains gray level values from a set M of original gray levels, and that the s output image signals As after a D / A conversion for supply to one each Electrode beam of the monitor and for brightness-corrected display of a gray level on a point of the monitor are provided.
- Each monitor has a device-specific brightness distribution, in which the above-mentioned problems occur when displaying an image signal. It is therefore necessary to adapt the image signal with its coded image information to the brightness distribution of the monitor in order to achieve a perceptionally optimal display.
- the image signal contains, for example, a coded medical image in its original recording form, which is fed to the correction unit.
- the correction unit receives this image signal, which contains gray level values from a set M of original gray levels. This set M of the original gray levels is assigned to the set K of the correction gray levels depending on the brightness distribution of the monitor.
- s digital output image signals are generated, which are each fed to a digital / analog conversion.
- the monitor is controlled by a number s of electrode beams, where s is a predetermined, natural number.
- the s analog output image signals are each supplied to one of the monitors controlled by s electrode beams.
- the s electrode beams are imaged on one point of the monitor, so that a mixture of several gray levels takes place here.
- the original gray value, which does not correspond to the perceptionally optimal representation, is represented by this mixture of the s electrode beams at one point, corrected for brightness.
- this arrangement according to the invention are in a correction unit
- Input gray levels assigned to several output gray levels Each of the several output gray levels is supplied to an electrode beam for displaying the output gray levels on the monitor.
- the multiple electrode beams are imaged on one point of the monitor, so that the multiple output gray levels are mixed.
- For each input gray level a different gray level is mixed from several output gray levels, and a perceptually optimal representation of the image signal on the monitor is created.
- the n-bit wide image signal can contain 2 different grayscale values. These original gray levels are corrected in the correction unit s each assigned 2 grayscale values. The number of correction quantities is determined by the number of s electrode beams. Each correction set has, for example, 2 different correction gray levels. Each original gray value is assigned to a gray scale value from each correction set, so that s output image signals are generated. With the assignment of s correction gray level values to each
- the brightness distribution of the monitor is adjusted to the optimal perceptional brightness distribution.
- calibration measurements are carried out with a luminance sensor.
- the luminance curves are recorded individually for each electrode beam and together for all electrode beams.
- the luminance sensor measures the brightness of the pixels directly on the surface of the picture tube of the monitor.
- the determined luminance curves are fed to the correction unit for calculating the correction tables.
- the luminance curves of the monitor are generated synthetically by a parametric description. Since the brightness distribution of the monitor also depends on user-specific settings, it is very complex to measure all possible settings beforehand and then assign the original gray level values to the correction gray level values. By setting up a calculation rule in which the luminance values depend on the brightness and contrast values, the luminance curves can be approximated with very good agreement by a simple parameter description. The brightness distributions or luminance curves are then calculated and then the assignment of the Original gray level values for the correction gray levels made in the look-up table in order to set a perceptionally optimal representation.
- An advantage of this invention is that three-channel graphics cards can be used for color monitors. These three-channel graphics cards are supplemented with a corresponding correction unit for adapting the brightness distribution of the monitor to the optimal perceptional brightness distribution. This means that no new hardware has to be developed.
- the n-bit wide image signal is supplied in the correction unit s correction quantities Ks which have a bit depth less than n.
- the digital / analog conversion can also be designed accordingly with a processing width of less than n.
- Such grayscale images are taken with X-ray devices, computers or magnetic resonance tomography devices or ultrasound devices.
- Fig. 1 shows a schematic representation of a correction according to the prior art
- Fig. 2 diagram of the brightness distribution of the monitor compared to the optimal perceptional brightness distribution.
- Fig. 3 shows a schematic representation of the arrangement according to the invention 1 shows a graphics card 15 with a correction unit 11 in the form of a look-up table which has an 8-bit wide input and an 8-bit wide output.
- a digital video image with a resolution of 8 bits is read into a video memory 10 via an input signal 14.
- This video image stored in the video memory 10 is forwarded to the correction unit 11.
- a correction or adjustment of the brightness values is carried out here for each grayscale value. It can be seen that for low grayscale values, for example 0 and 1, both values are set to grayscale value 3 during the adjustment.
- a 1: 1 translation is only carried out in the lighter area at grayscale values 254 and 255. With this correction, new values are assigned to the digital image data in a look-up table, which are then used in the digital / analog
- Converter 12 are converted into an analog signal, which is fed to the monitor 13. With this correction, brightness values are generated that are closer to the optimal perceptional brightness distribution. In the arrangement shown in FIG. 1, however, gray scale values are lost during the correction.
- Fig. 2 shows two curves in a diagram. Luminance values are mapped here over different binary grayscale values. Curve 42 shows a typical luminance curve of a monitor. The insufficient display of low grayscale values is clearly visible here. Curve 41 shows a perceptually optimal curve. In this curve, the low grayscale values are also assigned distinguishable luminance values.
- Fig. 3 shows a schematic representation of the arrangement according to the invention.
- the grayscale values encoded with 8 bits are fed to a correction unit 33.
- the correction unit 33 is implemented, for example, by a look-up table.
- three gray level values of the three correction amounts K s are assigned to each gray level value of the 8 bit wide image signal 34. It can be seen that far more gray levels can be generated from 256 possible gray level values of the original gray levels 23. A total of a number of gray scale values can be generated which corresponds to the permutation of the three gray scale values from Ki, K 2 , K 3 .
- the gray level value 0 black
- the gray level value 0 in the correction amount K 1 is supplied once to the gray level value 2 in the correction amount K 1, then to the gray level value 0 in the correction amount K 2 and the gray level value 3 in the correction amount K 3 .
- a grayscale value is generated which is neither a grayscale value of 0,1,2 or 3 corresponds, but lies between 2 and 3.
- This respective gray level value which was assigned in the individual three correction quantities K 1 5 K 2 , K 3 , is in each case supplied to an 8-bit wide digital / analog conversion 27, 28, 29. After this digital
- Output image signals A s were converted into an analog signal in each case, these are each supplied to an electrode beam of the triple gun monitor 31.
- the three rays depict the assigned grayscale values on a common pixel. This will mix the three possibly different grayscale values at this point.
- the image corrected for its brightness distribution is thus displayed on this triple gun monitor 31.
- a calibration is carried out with the luminance sensor 30.
- the luminance curves of the monitor In order to form the assignment rule for the look-up table in the correction unit, it is necessary to know the luminance curves of the monitor. To calibrate the arrangement, the brightness distributions are recorded individually in the form of the luminance curves of the three electrode beams. A luminance curve is also recorded for all three electrode beams together. These luminance curves are fed to the correction unit. Using these luminance curves, the grayscale values of the correction quantities are assigned to the original grayscale values.
- the correction unit With the photosensor 32, which is arranged in the front of the monitor, the correction unit is adapted for different ambient light situations. Several correction tables are set up for several different values of the ambient light. When this arrangement according to the invention is operated, the correction table that corresponds to the measured ambient light is selected.
- a light-sensitive sensor When combining both sensors, a light-sensitive sensor is first used to record the luminance curves of the monitor. Then it is arranged so that it can absorb the ambient light. Most monitors do not have an ambient light sensor, so that this combination also allows changing ambient light situations to be taken into account when assigning the grayscale values.
- the luminance curves can be calculated for all user-specific values. Then only the user-specific Values saved with which the luminance curves are calculated. With an assignment rule, the luminance values or grayscale values of the calculated luminance curve are then adapted to a perceptionally optimal representation curve (FIGS. 3, 41).
- the video memory 22 and the three 8-bit digital / analog converters and the correction unit 33 are arranged on a graphics card which is used for color monitors.
- the correction unit can be arranged as a programmable memory on the graphics card. It can also be arranged in a separate hardware unit with its own controller. An arrangement of the components mentioned directly in the monitor can also be implemented. This arrangement allows a medical image with a higher one
- a medical image encoded with 10 bits can have 1024 different gray levels.
- three correction amounts which are coded with 8 bits and each contain only 256 different gray levels, it is possible to display 16.8 million gray level combinations.
- the three output image signals generated in this way with the gray levels of the correction quantities K s can then be implemented in digital / analog converters with a smaller processing range.
Landscapes
- Controls And Circuits For Display Device (AREA)
- Image Processing (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19857761A DE19857761A1 (de) | 1998-12-15 | 1998-12-15 | Monochromes Displaysystem mit verbesserter Graustufendarstellung |
DE19857761 | 1998-12-15 | ||
PCT/EP1999/009265 WO2000036825A1 (de) | 1998-12-15 | 1999-11-29 | Anzeigevorrichtung mit verbesserter graustufendarstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1055322A1 true EP1055322A1 (de) | 2000-11-29 |
Family
ID=7891107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99962179A Withdrawn EP1055322A1 (de) | 1998-12-15 | 1999-11-29 | Anzeigevorrichtung mit verbesserter graustufendarstellung |
Country Status (5)
Country | Link |
---|---|
US (1) | US6618056B1 (de) |
EP (1) | EP1055322A1 (de) |
JP (1) | JP2002532767A (de) |
DE (1) | DE19857761A1 (de) |
WO (1) | WO2000036825A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10226233A1 (de) * | 2002-06-13 | 2004-01-08 | Bullacher, Jürgen | Vorrichtung zur Wandlung digitaler Bildausgangssignale eines Rechners in analoge Bildsignale für einen Hochauflösungs-Monitor |
JP4794811B2 (ja) * | 2003-07-23 | 2011-10-19 | 任天堂株式会社 | 画像処理プログラム及び画像処理装置 |
US7643040B1 (en) | 2004-04-08 | 2010-01-05 | Sonosite, Inc. | System and method for enhancing gray scale output on a color display |
KR20070032992A (ko) * | 2004-07-13 | 2007-03-23 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 주변 조명 제어를 통한 표준화된 디지털 이미지 시청 |
US8519956B2 (en) * | 2006-07-10 | 2013-08-27 | Koninklijke Philips N.V. | System and method for DICOM compliant display of ultrasound images in varying ambient light |
CN108141508B (zh) | 2015-09-21 | 2021-02-26 | 杜比实验室特许公司 | 一种成像装置及在其显示面板前面产生光的方法 |
CN106782303B (zh) * | 2016-12-28 | 2018-12-25 | 上海天马有机发光显示技术有限公司 | 一种显示面板的显示校正方法、装置及系统 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3649755A (en) * | 1970-06-01 | 1972-03-14 | Bendix Corp | Method and means for providing a lighted display having a constant contrast ratio |
US4340904A (en) * | 1980-12-24 | 1982-07-20 | General Electric Company | Automatic gray scale tracking system for cathode ray display devices |
JPS60254190A (ja) * | 1984-05-31 | 1985-12-14 | 株式会社 アスキ− | デイスプレイコントロ−ラ |
US4827255A (en) * | 1985-05-31 | 1989-05-02 | Ascii Corporation | Display control system which produces varying patterns to reduce flickering |
IL86107A (en) * | 1988-04-18 | 1991-12-15 | Scitex Corp Ltd | Color conversion display apparatus and method |
JPH0743580B2 (ja) * | 1988-09-22 | 1995-05-15 | インターナショナル・ビジネス・マシーンズ・コーポレーション | グレイ・スケールを変換する方法 |
IL91303A0 (en) * | 1989-08-14 | 1990-03-19 | Ibm Israel | System for displaying images on a cathode ray tube |
JPH03233495A (ja) * | 1990-02-08 | 1991-10-17 | Canon Inc | 画像表示装置 |
JP3137367B2 (ja) * | 1990-08-09 | 2001-02-19 | 株式会社東芝 | カラーパネル表示制御システム及びコンピュータシステム |
US5506699A (en) * | 1993-04-27 | 1996-04-09 | Wong; Ping W. | Method and apparatus for converting a halftone image into a continuous tone image |
EP0746946B1 (de) * | 1994-12-22 | 2001-06-13 | Koninklijke Philips Electronics N.V. | Anzeigevorrichtung mit kathodenstrahlröhre |
US5883985A (en) * | 1996-12-10 | 1999-03-16 | General Electric Company | Method for compensating image data to adjust for characteristics of a network output device |
US6278496B1 (en) * | 1997-10-09 | 2001-08-21 | Sanyo Electric Co., Ltd. | Digital correction circuit and image data processing apparatus equipped with a digital correction circuit |
-
1998
- 1998-12-15 DE DE19857761A patent/DE19857761A1/de not_active Withdrawn
-
1999
- 1999-11-29 JP JP2000588960A patent/JP2002532767A/ja not_active Withdrawn
- 1999-11-29 US US09/622,297 patent/US6618056B1/en not_active Expired - Fee Related
- 1999-11-29 EP EP99962179A patent/EP1055322A1/de not_active Withdrawn
- 1999-11-29 WO PCT/EP1999/009265 patent/WO2000036825A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0036825A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19857761A1 (de) | 2000-06-21 |
JP2002532767A (ja) | 2002-10-02 |
US6618056B1 (en) | 2003-09-09 |
WO2000036825A1 (de) | 2000-06-22 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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Effective date: 20001222 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PHILIPS CORPORATE INTELLECTUAL PROPERTY GMBH Owner name: KONINKLIJKE PHILIPS ELECTRONICS N.V. |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH Owner name: KONINKLIJKE PHILIPS ELECTRONICS N.V. |
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RBV | Designated contracting states (corrected) |
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