WO2001060078A1 - Procede d'evaluation d'affichage, dispositif d'evaluation et appareil de reproduction d'image variable dans le temps - Google Patents

Procede d'evaluation d'affichage, dispositif d'evaluation et appareil de reproduction d'image variable dans le temps Download PDF

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Publication number
WO2001060078A1
WO2001060078A1 PCT/JP2001/000322 JP0100322W WO0160078A1 WO 2001060078 A1 WO2001060078 A1 WO 2001060078A1 JP 0100322 W JP0100322 W JP 0100322W WO 0160078 A1 WO0160078 A1 WO 0160078A1
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WO
WIPO (PCT)
Prior art keywords
moving image
moving
time
display
image
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PCT/JP2001/000322
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English (en)
Japanese (ja)
Inventor
Tsunenori Yamamoto
Yoshinori Aono
Makoto Tsumura
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Hitachi, Ltd.
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 Hitachi, Ltd. filed Critical Hitachi, Ltd.
Publication of WO2001060078A1 publication Critical patent/WO2001060078A1/fr

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    • 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 display device evaluation method and an evaluation device, and more particularly to a method for evaluating a moving image display characteristic of a display device and an evaluation device.
  • BACKGROUND ART In recent years, as display devices such as LCD and PDP have become widespread, it has become clear that the moving image display characteristics of these display devices are different from those of conventional CRT-based display devices. This is because the conventional CRT is an impulse-type display device, while the LCD and PDP are hold-type display devices.
  • the present invention has been made to solve such a problem, and an object of the present invention is to provide a method and an apparatus for evaluating moving image display characteristics that are easily managed by numerical targets.
  • FIG. 1 is a block diagram of a moving image display performance evaluation device of a display device according to an embodiment of the present invention.
  • FIG. 2 is a block diagram of the moving image signal generation circuit 100 in the embodiment of FIG.
  • FIG. 3 is an explanatory diagram illustrating a measurement moving image pattern in the embodiment of FIG.
  • FIG. 4 is a block diagram of the shooting trigger generation circuit in the embodiment of FIG.
  • FIG. 5 is an explanatory diagram showing a still image captured by the evaluation device of the embodiment of FIG.
  • FIG. 6 is an explanatory diagram showing an example of a moving image continuously photographed by the evaluation device of the embodiment in FIG.
  • FIG. 7 is an explanatory diagram showing an image obtained by combining moving images continuously shot by the evaluation apparatus of the embodiment in FIG. 1 while shifting the moving images.
  • FIG. 8 is a graph showing a sectional luminance profile of a composite image in the evaluation device of the embodiment of FIG.
  • FIG. 9 is a graph showing one example (Dynamic C.R.) of the evaluation result of the moving image display characteristics in the evaluation device of the embodiment of FIG.
  • FIG. 10 is a graph showing one example (halftone width, half width) of the evaluation result of the moving image display characteristics in the evaluation device of the embodiment of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • a photographing element (CCD) with a shirt and evening function capable of performing a random trigger operation and a photographing element
  • An image processing controller that captures images captured with a (CD), superimposes the captured images while shifting them, and processes the synthesized image, and a display device that is a measurement target that displays moving image quality evaluation images.
  • a trigger output circuit for receiving a display control signal and outputting a trigger output to a trigger input of a photographing element (CCD).
  • An image obtained by photographing with an element and superimposed and synthesized while being shifted by the image processing controller, and a sectional plot shape thereof are used as evaluation numerical values.
  • FIG. 1 shows a block diagram of a moving image display characteristic evaluation device according to the present embodiment.
  • the present moving image display characteristic evaluation apparatus includes a moving image signal generation circuit 100, a CCD 120, and a controller 200.
  • the moving image signal generation circuit 100 is a moving image for measurement on the display device 110 to be measured
  • the shooting trigger generation circuit 104 in the circuit generates the shooting trigger according to the measurement timing and supplies it to the CCD 120. .
  • the CCD 120 captures all or part of the display area of the display device 110 that displays moving images by the supplied trigger, and controls the captured image data. It is sequentially transferred to one lane 200.
  • the controller 200 is realized by, for example, executing a program corresponding to a process described below in a well-known computer system including a CPU, a memory, and input / output means.
  • the controller 200 saves the image data transferred from the CCD 120 as a time-series still image (time-series still image storage block 210).
  • each of the rectangular areas 2 101 exemplifies one still image.
  • the still image to be acquired does not need to be the image shown in the entire display area of the display device, and if at least a part of the moving image is displayed, the still image is displayed in a partial area of the display area. The image shown may be used.
  • a series of stored time-series still images are synthesized while being spatially shifted so as to be synchronized with the moving direction and the moving amount of the moving image, and a synthesized image 2221 is created (time-series still image shift).
  • Synthesis pro- cess 220 The luminance distribution of the synthesized image 2201 is obtained by adding the pixel values of the corresponding area of each still image along the arrow 2102 corresponding to the moving speed of the moving image shown in the figure. It is possible. Details will be described later with specific examples.
  • the synthesized image obtained in this way is generated so that a human observes the moving image while following the moving image and is almost equal to the recognized image.
  • a numerical value as a moving image display characteristic is obtained by analyzing the cross-sectional profile and luminance information of the synthesized image (numerical analysis protocol 230).
  • FIG. 2 is a block diagram of the moving image signal generation circuit 100 for explaining the details.
  • the moving image signal generation circuit 100 adjusts the dot clock frequency and resolution in accordance with the resolution and frequency characteristics of the display device 110 to be measured.
  • the dot clock, horizontal synchronization, and vertical synchronization signals are generated from the dot clock generation circuit 101 and the control signal generation circuit 102 by setting the degree.
  • a moving image signal for measurement is generated by the moving image signal generating circuit 103 using these control signals.
  • Pattern (1) is a vertical bar solidly filled with a constant fill gradation within the background gradation.
  • the bar scrolls horizontally with respect to the background gradation, and when one short part is reached, scrolling resumes from the other end.
  • the background gradation is white and the fill gradation is black.
  • the background gradation, the fill gradation, the bar width, the scroll moving speed, etc. can be changed as the measured image parameters.
  • the moving speed is an important parameter, and in the present embodiment, the moving speed is defined by the number of moving pixels per rewriting cycle (ppf: Pixel Per Frame).
  • the filled part of the pattern (1) changes continuously in a one-cycle wave (isolated wave).
  • the background gradation is white and the center of the wave is black.
  • the background gradation, wave phase, width, scroll speed, etc. can also be changed.
  • pattern (3) is a pattern (2) in which the waves of one cycle are continuous and the background is lost.
  • the pattern used in the present invention is not limited to the above-mentioned pattern, and the pattern shape, brightness, color, gradation, moving direction, moving speed, etc. are set according to the display characteristics to be evaluated. It is good also as a structure which performs.
  • any one of the three types of patterns as described above is displayed as a moving image (scroll).
  • the scroll display When the scroll display is viewed by a human, the human eye scrolls. Watching the display while following along.
  • the image that humans perceive is that the luminance is integrated over time while moving (shifting the location) according to the scroll. It is an image of the result.
  • the shooting cycle (sampling cycle) must be at least 1/2 of the rewrite cycle (1 frame) (Nyquist frequency), and the temporal resolution of the human eye is 1/300. Considering that it is on the order of seconds, it is desirable that it be less than about 3 ms. In the present embodiment, one frame of display is 16.6 msec (60 Hz), so it is desirable to divide one frame into six or more at equal intervals and shoot.
  • a CCD camera with a shooting frequency of 360 Hz or more is required to perform six or more consecutive shots in the same frame.
  • the number of pixels is limited, so in the present embodiment, the display pattern returns to the same place when a scrolling moving image is displayed as shown in FIG. Frames were detected, and at least six shots were taken on different frames displaying the same image while changing the timing.
  • Fig. 4 shows a block diagram of this shooting trigger generation circuit 104.
  • 1 / n frame count 13 1 and dot clock count 13 2 and comparator 13 5 are used when shooting n times per frame. Outputs / n timing.
  • Dot clock count 1 32 is the count for counting the dot clock for one frame period.
  • the output value of the dot clock counter 13 matches the output value of the 1 / n frame counter 131, the output of the comparator 13 becomes positive.
  • 1 / n frame count 1 3 1 internally holds a value obtained by dividing the number of dot clocks per frame by 1 / n, and every time a picture is taken, the output value is counted up by that value. Always run in frame Connection timing can be output.
  • Scroll current position count The number of scrolling positions is counted by adding the scroll movement amount for each vertical synchronization.
  • the scroll measurement position counter 133 starts scrolling and holds the scroll position at the time of the first shooting, and the output of the comparator 1336 becomes positive when the outputs match.
  • the output of the AND circuit 1337 becomes positive, and the shooting output trigger is output.
  • the count of the scroll measurement position 1/33 is 1 / n frame count 1/31 and the count is increased n times, the force is increased by the number of pixels for the moving speed. In order to indicate the next scroll measurement position, continuity of shooting between frames is also maintained.
  • the trigger output from the shooting trigger output circuit 104 in this way has a different timing depending on the moving speed ⁇ the number of shooting divisions n within the frame.
  • accurate triggering is performed with an external trigger.
  • the exposure time is less than 1/300 second because the temporal resolution of the human eye is about 1/300 second. Desirably, in this embodiment, the exposure time is 1/500 second.
  • the moving image display is a solid black pattern (1) on a white background.
  • Figure 5 shows an image of the display section taken with CCD 120 when this pattern (1) is displayed without scrolling (still image display).
  • the pattern width of this pattern (1) is 32 pixels.
  • FIG. 6 shows one of the still images continuously captured by the CCD 120 when the display (1) is scrolled at a moving speed of 8 ppf (pixels per frame).
  • the controller 200 acquires the above-described still images in a time-series manner and saves them in the time-series still-image storage block 210.
  • the nth and n + 1 6th still images have the same halftone pattern, and differ only in the location by the amount of movement of one frame.
  • the movement amount is 8 p pf at a constant velocity
  • the position is moved by 8 pixels on the display device to be measured.
  • the human eye follows this movement and the point of gaze always shifts, so that each still image of the time-series still images is shifted in the scrolling direction according to the time within the frame, and each image is shifted. By compositing, it is possible to reproduce an image perceived by human eyes.
  • FIG. 7 shows the image synthesized in this way.
  • the above-described synthesizing process is performed by the time-series still image shift synthesizing block 220.
  • the synthesized image in FIG. The delay and the blur caused by the hold-type display are added, and the image to be seen, which is a still image similar to that in Fig.
  • Figure 8 shows the cross-sectional luminance profile of the composite image when the above pattern (1) is scrolled at scrolling speeds of 1, 2, 4, and 8 ppf. It can be seen that as the moving speed increases, the halftone region expands and the blur increases. By analyzing this cross-sectional brightness profile, the moving image display characteristics can be quantified.
  • the ratio of the white luminance level to the black luminance level of this cross-sectional luminance profile can be compared with the contrast ratio of a still image and quantified as the dynamic-to-contrast ratio (Dynamic-CR). .
  • Dynamic-CR dynamic-to-contrast ratio
  • FIG. Figure 10 shows the pattern (1) It shows the relationship between the half-value width of the sectional luminance profile and the width of the halftone area appearing before and after the pattern (1), and the moving speed.
  • the pixel number parameter on the vertical axis of the graph indicates the width of the CCD 120 on the imaging screen, and corresponds to the number of pixels on the display screen.
  • This graph shows that the size of the left and right halftone areas increases in proportion to the increase in the moving speed, and that the blur becomes larger. It was also observed that the half-width decreased as the moving speed increased.
  • the pattern (1) is used as an example of the moving image display pattern.
  • the same evaluation can be performed when the pattern (2) or the pattern (3) is used.
  • pattern (2) and pattern (3) have more severe Dynamic-CR values, and are close to real images such as natural images in terms of pattern, so they are suitable for evaluation of Dynamic-CR characteristics. .
  • the shooting trigger generation circuit 104 is configured in the video signal generation circuit 100, but a general-purpose video signal source is used as the video signal generation circuit.
  • the shooting trigger generating circuit 104 may be provided between the image signal source and the display device to be measured, and data such as the moving amount of the moving image may be input.
  • the digitization of dynamic-R., Halftone width, half width, and the like of the moving image display characteristics in the present embodiment is merely an example, and evaluation items that may appear due to the moving image display characteristics of the display device, such as moving images
  • Other parameters set for detecting blur, color change, and the like in the boundary region of the image can be quantified in the same manner as described above.
  • the measurement environment is used for the sensory test. There is no need to strictly maintain the image quality and the number of subjects is not required, so the cost and time for measurement are short.Five levels of sensory evaluation are used to quantify image brightness information and cross-sectional brightness profiles. Numerical targets that can be evaluated more than evaluation This makes it possible to provide a method and an apparatus for evaluating moving image display characteristics, which can be easily managed by a computer and enable highly accurate evaluation.
  • the present invention as a means for evaluating the moving image display characteristics of a display device, there is no need to rigorously prepare a measurement environment for sensory tests or to collect a large number of subjects.
  • the cost and time required for measurement are short, and a numerical evaluation of five or more levels based on sensory evaluation is possible, which facilitates management using numerical targets.

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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)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Processing Or Creating Images (AREA)
  • Image Processing (AREA)

Abstract

L'invention concerne un procédé et un appareil pour l'évaluation objective et numérique de la qualité d'une image variable dans le temps affichée sur un affichage. L'image variable dans le temps affichée sur un affichage (110) étant un objet à évaluer, elle est collectée sous forme d'images fixes en séquences temporelles par un CCD (120), images fixes en séquences temporelles capturées dans un organe de commande (200) et superposées en accord dans le sens dans lequel les images variables dans le temps sont décalées, ce qui permet la combinaison des images fixes en séquences temporelles. Les informations relatives à la luminosité des images ainsi synthétisées et la forme graphique de la section sont représentées graphiquement.
PCT/JP2001/000322 2000-01-19 2001-01-19 Procede d'evaluation d'affichage, dispositif d'evaluation et appareil de reproduction d'image variable dans le temps WO2001060078A1 (fr)

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JP2000009804A JP3701163B2 (ja) 2000-01-19 2000-01-19 動画表示特性の評価装置
JP2000-9804 2000-01-19

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Cited By (6)

* Cited by examiner, † Cited by third party
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NL1028896C2 (nl) * 2004-05-21 2006-03-27 Otsuka Denshi Kk Werkwijze en inrichting voor evaluatie van een beeldscherm.
EP1643776A1 (fr) * 2003-06-30 2006-04-05 Otsuka Electronics Co., Ltd. Systeme et procede de mesure/evaluation de la qualite d'une image en deplacement sur un ecran
NL1031822C2 (nl) * 2005-05-20 2007-05-31 Otsuka Denshi Kk Werkwijze voor het evalueren van de prestaties voor het weergeven van bewegende beelden, een inspectiebeeldscherm en een samenstel voor het evalueren van de prestaties voor het weergeven van bewegende beelden.
JP2007243609A (ja) * 2006-03-08 2007-09-20 Otsuka Denshi Co Ltd 動画応答曲線の測定方法及び装置
NL1033466C2 (nl) * 2006-03-27 2008-02-12 Otsuka Denshi Kk Werkwijze en programma voor het verbeteren van bewegende beeldkwaliteit van een kleurendisplay.
US7847819B2 (en) 2003-02-21 2010-12-07 Otsuka Electronics Co., Ltd. Measurement system for evaluating moving image quality of displays

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JP4286068B2 (ja) * 2003-06-03 2009-06-24 大塚電子株式会社 画面の動画質評価方法
CN1573450A (zh) 2003-06-10 2005-02-02 株式会社日立显示器 液晶显示装置及其驱动方法
JP2006084496A (ja) * 2004-09-14 2006-03-30 V Technology Co Ltd 点灯検査装置
JP4835008B2 (ja) 2005-03-04 2011-12-14 ソニー株式会社 情報処理装置および方法、記録媒体、並びにプログラム
JP4663670B2 (ja) * 2007-03-29 2011-04-06 大塚電子株式会社 動画像処理装置及び方法
JP4663669B2 (ja) * 2007-03-29 2011-04-06 大塚電子株式会社 動画像処理装置及び方法
TWI436303B (zh) 2007-03-29 2014-05-01 Otsuka Denshi Kk 動畫影像處理裝置及動畫響應曲線取得方法
JP2009055112A (ja) * 2007-08-23 2009-03-12 Otsuka Denshi Co Ltd 動画特性評価方法及び装置
JP5464656B2 (ja) * 2010-01-12 2014-04-09 Ｎｅｃカシオモバイルコミュニケーションズ株式会社 画質評価装置、端末装置、画質評価システム、画質評価方法及びプログラム
KR101526008B1 (ko) * 2013-05-31 2015-06-04 제일모직주식회사 광학필름의 이미지 블러 평가방법

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JPH0638247A (ja) * 1992-07-17 1994-02-10 Hosiden Corp 液晶パネルのテスト・パターン信号発生器

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7847819B2 (en) 2003-02-21 2010-12-07 Otsuka Electronics Co., Ltd. Measurement system for evaluating moving image quality of displays
EP1643776A1 (fr) * 2003-06-30 2006-04-05 Otsuka Electronics Co., Ltd. Systeme et procede de mesure/evaluation de la qualite d'une image en deplacement sur un ecran
EP1643776A4 (fr) * 2003-06-30 2007-05-23 Otsuka Denshi Kk Systeme et procede de mesure/evaluation de la qualite d'une image en deplacement sur un ecran
NL1028896C2 (nl) * 2004-05-21 2006-03-27 Otsuka Denshi Kk Werkwijze en inrichting voor evaluatie van een beeldscherm.
US7394483B2 (en) 2004-05-21 2008-07-01 Otsuka Electronics Co., Ltd. Display evaluation method and apparatus
NL1031822C2 (nl) * 2005-05-20 2007-05-31 Otsuka Denshi Kk Werkwijze voor het evalueren van de prestaties voor het weergeven van bewegende beelden, een inspectiebeeldscherm en een samenstel voor het evalueren van de prestaties voor het weergeven van bewegende beelden.
JP2007243609A (ja) * 2006-03-08 2007-09-20 Otsuka Denshi Co Ltd 動画応答曲線の測定方法及び装置
NL1033465C2 (nl) * 2006-03-08 2008-02-12 Otsuka Denshi Kk Werkwijze en inrichting voor het meten van bewegende afbeeldingsreactiekromme.
JP4580356B2 (ja) * 2006-03-08 2010-11-10 大塚電子株式会社 動画応答曲線の測定方法及び装置
US8164632B2 (en) 2006-03-08 2012-04-24 Otsuka Electronics Co., Ltd. Method and apparatus for measuring moving picture response curve
NL1033466C2 (nl) * 2006-03-27 2008-02-12 Otsuka Denshi Kk Werkwijze en programma voor het verbeteren van bewegende beeldkwaliteit van een kleurendisplay.

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JP2001204049A (ja) 2001-07-27
JP3701163B2 (ja) 2005-09-28

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