WO2002042727A1 - Systeme d'affichage d'une valeur mesuree mtf de moniteur crt et son procede - Google Patents

Systeme d'affichage d'une valeur mesuree mtf de moniteur crt et son procede Download PDF

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Publication number
WO2002042727A1
WO2002042727A1 PCT/JP2000/008304 JP0008304W WO0242727A1 WO 2002042727 A1 WO2002042727 A1 WO 2002042727A1 JP 0008304 W JP0008304 W JP 0008304W WO 0242727 A1 WO0242727 A1 WO 0242727A1
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WO
WIPO (PCT)
Prior art keywords
mtf
information
pattern image
display device
measurement
Prior art date
Application number
PCT/JP2000/008304
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English (en)
Japanese (ja)
Inventor
Chiaki Todaka
Ron Simpson
Toshihiko Furukawa
Original Assignee
Nippon Chemi-Con Corporation
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 Nippon Chemi-Con Corporation filed Critical Nippon Chemi-Con Corporation
Priority to PCT/JP2000/008304 priority Critical patent/WO2002042727A1/fr
Priority to JP2002544619A priority patent/JPWO2002042727A1/ja
Publication of WO2002042727A1 publication Critical patent/WO2002042727A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers

Definitions

  • the present invention relates to a diagnostic image information obtained by imaging a patient, a workstation for storing the diagnostic image information, and an MTF measurement value display of a display device for displaying the diagnostic image information.
  • CRT diagnostic imaging using CRT monitors has been active in the United States and Europe. As of 2000, the penetration rate in the world market is about 5 to 8%, and it is said that it will reach about 70% in the next 8 years.
  • CRT (or any display) diagnostic imaging replaces traditional diagnostic X-ray film with an electronically-displayed display system
  • electronically-diagnosed diagnostic display monitors can be compared to X-ray films. Since the image quality deteriorates at a very high speed, the monitor performance parameters (brightness, gamma characteristics, MTF, etc.) can be easily maintained and quantitatively, taking into account the security of the diagnosing doctor and the assurance of the patient being diagnosed. Being able to measure is important. This is because the deterioration of the image quality due to the change over time may cause an erroneous diagnosis.
  • the MTF is the level of brightness (range of brightness values) that can be displayed on a monitor, and is entirely white (DC).
  • Fig. 3 (a) As the 100% reference, other frequencies f (Fig. 3 (b) or (c) Assuming that the brightness of the white part of the stripe pattern displayed by) is b (f), the MTF (f) at this f is expressed by (Equation 1).
  • Fig. 3 (b) shows the image at low frequency f1 and the change in luminance at the bottom. That is, The black part and the white part are alternately continuous stripes, but the width of the white part and the black part is not thin.
  • the MTF is (b (f 1) / A) * 100.
  • Figure 3 (c) shows the image at the high frequency (f h) at the top and the change in brightness at the bottom.
  • the black portion and the white portion are alternately and continuously striped, but the width of the white portion and the black portion is small.
  • the MTF is
  • Fig. 3 (d) is a graph showing the relationship between MTF and frequency. In general, the higher the frequency, the lower the MTF. Also, the longer the CRT is used, the lower the MTF value. '
  • an object of the present invention is to provide an MTF measurement system capable of easily measuring and recording a target CRT diagnostic image in a short time and recording a change with time. Disclosure of the invention
  • An MTF measurement value display system for a CRT monitor displays a diagnostic image information of a patient and a workstation for storing the diagnostic image information and a display device for displaying the diagnostic image information.
  • a light-receiving sensor that captures an image
  • a means connected to the light-receiving sensor, built-in to the workstation, and configured to extract maximum and minimum points of the MTF measurement captured pattern image
  • a means for performing the extraction processing A means for calculating the MTF from the extraction processing information of the maximum point and the minimum point of the captured pattern image for MTF measurement built in the workstation, and a display device connected to the means for calculating the MTF.
  • the manufacturing information, performance information, or environmental information of the display device is linked and recorded in a memory for storing the performance parameters including the MTF.
  • This environment information is characterized by comprising luminance and gamma characteristics.
  • a memory for storing performance parameters including the MTF is built in the workstation.
  • the captured pattern image for MTF measurement simultaneously includes a DC component pattern as a reference value at the time of calculating the MTF value and an AC component pattern of the MTF value to be obtained.
  • the method of displaying the MTF measurement value of the CRT monitor is as follows: the diagnostic image information of the patient, the workstation that stores the diagnostic image information, and the display method that displays the diagnostic image information.
  • a display step, a light receiving sensor attached to the front of the display device, a step of taking in an MTF measurement capture pattern image of the display device, and a means for extracting and processing a maximum point and a minimum point are connected to the light receiving sensor.
  • the manufacturing information, performance information, or environmental information of the display device is recorded in a memory storing the performance parameters including the MTF in a linked manner.
  • This environment information is characterized by comprising luminance and gamma characteristics.
  • a memory for storing the performance parameters including the MTF is built in the workstation.
  • the captured image for MTF measurement includes simultaneously a DC component pattern which is a reference value at the time of calculating the MTF value and an AC component pattern of the MTF value to be obtained.
  • FIG. 1 is a block diagram of an embodiment of an MTF measurement value display system for a CRT monitor according to the present invention
  • FIG. 2 is a configuration diagram showing an embodiment of an MTF measurement value display system for a CRT monitor according to the present invention.
  • Fig. 3 (a) is a schematic diagram showing the brightness and its image in the case of DC, (b) is a schematic diagram showing the brightness in the case of low frequency (f1), and (c) is a high diagram. The luminance and the schematic diagram at the frequency (ih) are shown, and (d) is a graph showing the relationship between MTF and frequency.
  • FIG. 4 is a captured image pattern diagram displayed in a monitor in the MTF measured value display system of the CRT monitor according to the present invention.
  • FIG. 5 is a block diagram showing a method of displaying an MTF measurement value of the CRT monitor according to the present invention.
  • FIG. 1 is a block diagram of an embodiment of an MTF measurement value display system for a CRT monitor according to the present invention.
  • MTF measurement value display system CRT monitor 2, workstation 4 connected to CRT monitor 2, and workstation 4 And a CCD sensor 6.
  • the CRT monitor 2 is a monitor of the workstation 4 and displays medical images.
  • the image device is not limited to the CRT, but may be any device capable of displaying images of a liquid crystal display device, a plasma display device, and a computer such as a workstation such as an EL display. good.
  • the CRT monitor 2 has a memory 12 for recording its manufacturing date, serial number, manufacturing information including a manufacturing location, and performance information such as luminance, gamma characteristics, and MTF including temporal changes. '
  • the CRT monitor 2 also has a function of displaying a captured image pattern (FIG. 4) for measuring MTF.
  • the workstation 4 includes a maximum and minimum point extraction processing software 8 connected to the CCD sensor 6 and an MTF calculation software 10 connected to the maximum and minimum point extraction software 8.
  • the maximum / minimum point extraction processing software 8 receives data obtained by capturing the captured image for measuring the MTF displayed on the entire CRT monitor 2 by the CCD sensor 6.
  • the maximum / minimum point extraction processing software 8 finds and captures the maximum and minimum points of luminance for each frequency from the captured image pattern for measuring the received MTF.
  • the MTF calculation software 10 obtains b (f) from the difference between the maximum point and the minimum point of the luminance obtained by the maximum / minimum point extraction processing software 8.
  • a in Equation 1 is obtained from the difference between the luminance of the white part and the luminance of the black part, which is DC.
  • the MTF is obtained from b (f) and A.
  • the CCD sensor 6 has a function of capturing a captured image pattern for measuring the MTF displayed on the entire CRT monitor 2.
  • the CRT monitor 2 may be scanned, but it is more preferable to collectively capture all images. This is because the imaging time is shortened and the subsequent processing time is shortened by setting the imaging data to the necessary minimum amount of data.
  • the imaging device is not limited to a CCD sensor, but may be a CMO.
  • An S imaging device or other devices may be used.
  • the use of a CCD sensor reduces the manufacturing cost, so that it can be reproduced at a lower price compared to conventional devices.
  • FIG. 2 is a configuration diagram showing an embodiment of an MTF measurement value display system for a CRT monitor according to the present invention.
  • the MTF measurement value display system consists of a CRT monitor 2, a workstation 4 connected to the CRT monitor 2, a keyboard and mouse 16 connected to the workstation 4, and a CCD sensor 6 connected to the workstation 4. Be composed.
  • FIG. 4 is a captured image pattern diagram displayed in a monitor in the MTF measured value display system of the CRT monitor according to the present invention.
  • the image pattern diagram shows an example of six image patterns for measuring the MTF of each frequency in the horizontal direction of the CRT monitor and the MTF of each frequency in the vertical direction of the CRT monitor.
  • FIG. 4 (a) shows a combination pattern of a low frequency and a limit frequency in the horizontal direction
  • FIG. 4 (b) shows a combination pattern of a low frequency and the limit frequency in the vertical direction.
  • c) is a combination pattern of a plurality of different frequencies in the horizontal direction
  • FIG. 4 (d) is a combination pattern of a plurality of different frequencies in the vertical direction
  • FIG. 4 (e) is a combination pattern of the horizontal and vertical frequencies.
  • Fig. 4 ( ⁇ ⁇ ⁇ ⁇ ) shows a combination pattern of a plurality of different frequencies in the horizontal and vertical directions.
  • a DC component without a frequency component that is, a pattern including only white and black
  • a pattern including an AC component for measuring MTF and simultaneously including a low frequency, a limit frequency, and a plurality of other frequencies are used. May be prepared. Using this pattern has the advantage of simultaneously measuring both ⁇ ⁇ and b (f) in Equation 1, which is the reference value.
  • FIG. 5 is a block diagram showing a method of displaying the measured MTF value of the CRT monitor according to the present invention.
  • start (A2) CRT monitor 2 displays the captured image pattern for measuring MTF on its screen (A4). This is to measure MTF.
  • the CCD sensor 6 captures a captured image pattern for measuring MTF on the screen of the CRT monitor 2 (A6). At this time, it is possible to perform imaging by the vertical and horizontal scanning methods, but it is more preferable to perform batch imaging.
  • the maximum / minimum point extraction processing software 8 receives data obtained by the CCD sensor 6 capturing a captured image pattern for measuring the MTF displayed on the entire CRT monitor 2.
  • the local maximum / minimum point extraction processing software 8 finds and captures the maximum and minimum points of luminance for each frequency from the captured image pattern for measuring the received MTF (A8).
  • the validity of the data such as the absence of a maximum point or a minimum point is determined. If the data is invalid, the process returns to the maximum / minimum point extraction process. If the data is valid, the process proceeds to the next step (A10).
  • the MTF calculation software 10 obtains b (f) from the difference between the maximum point and the minimum point of the luminance obtained by the maximum / minimum point extraction processing software 8.
  • a in Equation 1 is obtained from the difference between the luminance of the white part and the luminance of the black part which is DC.
  • the MTF is obtained from b (f) and A (A12).
  • the MTF calculation software 10 records the MTF measurement results in the memory 12 for recording performance information such as luminance, gamma characteristics, and MTF including temporal changes in the CRT monitor 2 (A16 ) And finish (A18).
  • performance information such as luminance, gamma characteristics, and MTF including temporal changes in the CRT monitor 2 (A16 ) And finish (A18).
  • the CTF monitor MTF measurement value display system According to the conventional image diagnosis monitor using a CRT display, only the luminance (low, high) and gamma correction curves are periodically displayed. On the other hand, by adding the MTF measurement according to the present invention, the CRT diagnosis monitor can be used. All of the important parameters will be aligned, and diagnostic accuracy can be quantitatively maintained.
  • the MTF measurement is performed with a simple CCD sensor, it can be realized with an extremely simple and inexpensive system.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

L'invention concerne un système d'affichage d'une valeur mesurée MTF d'un moniteur CRT, présentant des informations d'images diagnostiques capturées par imagerie d'un sujet, un poste de travail dans lequel les informations d'images diagnostiques sont stockées, et un affichage destiné à afficher les informations d'images diagnostiques, comprenant un affichage capable d'afficher une image type capturée de mesure MTF, un capteur photorécepteur placé en plus à l'avant de l'affichage de manière à capturer l'image type, un moyen d'extraction connecté au capteur photorécepteur et intégré au poste de travail de manière à extraire un point maximum et un point minimum de l'image type, un moyen adapté pour calculer une MTF à partir des informations relatives à l'extraction d'un point maximum et d'un point minimum de l'image type connecté au moyen d'extraction, et intégré au poste de travail, ainsi qu'une mémoire placée à l'intérieur de l'affichage connectée au moyen de calcul afin d'y stocker des paramètres de performances contenant la MTF.
PCT/JP2000/008304 2000-11-24 2000-11-24 Systeme d'affichage d'une valeur mesuree mtf de moniteur crt et son procede WO2002042727A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2000/008304 WO2002042727A1 (fr) 2000-11-24 2000-11-24 Systeme d'affichage d'une valeur mesuree mtf de moniteur crt et son procede
JP2002544619A JPWO2002042727A1 (ja) 2000-11-24 2000-11-24 Ｃｒｔモニタのｍｔｆ測定値表示システムとその方法

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Application Number Priority Date Filing Date Title
PCT/JP2000/008304 WO2002042727A1 (fr) 2000-11-24 2000-11-24 Systeme d'affichage d'une valeur mesuree mtf de moniteur crt et son procede

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05249437A (ja) * 1992-03-03 1993-09-28 Canon Inc 表示器
JPH07168543A (ja) * 1993-12-14 1995-07-04 Nippon Hoso Kyokai <Nhk> ディスプレイの解像度測定装置
JP2000253425A (ja) * 1999-02-26 2000-09-14 Canon Inc 画像表示装置制御システム及び画像表示システム制御方法
JP2000287227A (ja) * 1999-03-31 2000-10-13 Fuji Photo Film Co Ltd 表示装置の鮮鋭度測定方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09198020A (ja) * 1996-01-17 1997-07-31 Fuji Photo Film Co Ltd 画像表示方法および装置
JP3726227B2 (ja) * 1999-04-02 2005-12-14 富士写真フイルム株式会社 画像表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05249437A (ja) * 1992-03-03 1993-09-28 Canon Inc 表示器
JPH07168543A (ja) * 1993-12-14 1995-07-04 Nippon Hoso Kyokai <Nhk> ディスプレイの解像度測定装置
JP2000253425A (ja) * 1999-02-26 2000-09-14 Canon Inc 画像表示装置制御システム及び画像表示システム制御方法
JP2000287227A (ja) * 1999-03-31 2000-10-13 Fuji Photo Film Co Ltd 表示装置の鮮鋭度測定方法

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