CN100502521C

CN100502521C - Measurement method for trailing time of motion vision

Info

Publication number: CN100502521C
Application number: CNB2004100836630A
Authority: CN
Inventors: 徐康兴
Original assignee: MUDAN SHIYUAN ELECTRONIC CO Ltd BEIJING
Current assignee: MUDAN SHIYUAN ELECTRONIC CO Ltd BEIJING
Priority date: 2004-10-15
Filing date: 2004-10-15
Publication date: 2009-06-17
Anticipated expiration: 2024-10-15
Also published as: CN1761330A

Abstract

The present invention discloses a test card for the trailing time of a motion image and a measurement method thereof. The test card comprises a darkness tending trailing time test card and a brightnesThe test cards include a test card for trailing time of tending towards dark and a test card for trailing time of tending towards bright. The said two cards are composed of series sequence of figures s tending trailing time test card which are formed from a plurality of groups of arbitrary shape figures with brightness of 100% or 0% according to a certain arrangement rule. Distances among the arbiof brightness as 100% or 0% in any shape with gaps according to certain rule. The said figures are repeating back and forth moved in constant speed on background in brightness as 100% or 0% integrallytrary shape figures which form the darkness tending trailing time test card and the brightness tending trailing time test card and have the brightness of 100% or 0% form a progression sequence accordi and periodically. Based on the position of the gap, which is not full covered by tail, measuring personnel determines the time needed for moving the gap so as to obtain trailing time of moving image.ng to a certain rule. When the test card is used for measurement, the arbitrary shape figures which form the darkness tending trailing time test card and the brightness tending trailing time test card Features are: simple, convenience, quick, and direct. and have the brightness of 100% or 0%, and the spacing of the arbitrary shape figures integrally and periodically do circulating reciprocating motion on a background with brightness of 100% or 0% at a constant speed. The desired time moving through the spacing is directly determined by measurement people according to the position of the spacing which is not totally covered by trailing at the beginning, and the desired time is the trailing time of a motion image. The measurement method is simple, convenient and quick, and the test result of the measurement method directly and exactly reflects the trailing performance of the motion image.

Description

A kind of method of measuring the motion video hangover time

Technical field

The present invention relates to a kind of method of measurement that is used to measure the test card of motion video hangover time and utilizes this test card measurement motion video hangover time.Utilize this test card and method of measurement thereof can measure the motion video hangover time of television indicator, computer display and various display screens extremely convenient, fast, exactly.

Background technology

At present, all kinds of new displays continue to bring out, and performances such as its definition, brightness, contrast have had considerable improvement than display in the past, still, the display that wherein has exists conditions of streaking, the length of hangover time directly to have influence on the quality of image when showing motion video.Therefore, the important indicator of estimating the quality of kinds of displays and machine product thereof at present is the length of hangover time.

In order to estimate the quality of kinds of displays and machine product thereof, just need show that the hangover time of motion video measures to display.At present, people mainly are to use a kind of instrument of GTG tester by name to measure hangover time.This instrument mainly is made up of several parts such as signal source, light probe and analyzers; Signal source is sent the vision signal of bright dark alternate, and light probe records the process of the image brightness variation of being play, the response time that draws the image brightness change procedure again by analyzer.This tester complicated operation, cost height, price are expensive, and the quotation that has is above 40,000 dollars; Its fatal shortcoming is: what its result's " response time " who measures gained said reflection exactly is the performance quality of display to the static graphics handoff procedure, rather than our hangover time truly that will measure, the result who takes the GTG tester to measure reflects that display is inaccurate to the evaluation of motion video hangover performance.In the experimentation, when we found to utilize this GTG tester to measure the motion video hangover time, its measurement result conformed to actual sometimes, disagrees sometimes even with actual conditions.

Summary of the invention

In view of the foregoing, in order to adapt to a large amount of at present test needs that adopt the tv product of new display spare, the purpose of this invention is to provide a kind of method that is used to measure various displays/display screen motion video hangover time, this method is compared with similar in the past method of measurement, simpler, convenient, fast, its test result reflects the motion video hangover performance of various display/display screens truely and accurately.

For achieving the above object, the present invention by the following technical solutions: a kind of method of measuring the motion video hangover time, this method of measurement may further comprise the steps:

The first step: select the suitable hangover time test card of specification and broadcast equipment;

The field frequency of the scan format that shows according to equipment under test is selected the motion video hangover time test card signal that conforms to the field frequency of the scan format of its demonstration and is broadcast equipment;

Second step: be familiar with the technical parameter of hangover time test card, grasp by each and determine the method for reading x at interval in the position in test card at interval;

The 3rd step: connect and broadcast equipment and tested display/display screen, broadcast test card, adjust the brightness and contrast of display screen;

The 4th step: examine conditions of streaking, find out on the dark trailing time test card that becomes of dynamically broadcasting with the dark trailing time that becomes corresponding that at interval on sequence number and the corresponding intervals reading value x1 thereof in intervening sequence and the bright hangover time test card that becomes with corresponding that sequence number and the corresponding intervals reading value x2 thereof in intervening sequence at interval of the bright hangover time that becomes;

The 5th step: the interval reading value x1 and the x2 that obtain according to the 4th step read dark trailing time x1Tc respectively and become bright hangover time x2Tc; Tc=1/Fv wherein, Tc is the field duration of scan format, Fv is the field frequency of scan format;

Described motion video hangover time test card, it comprises the test card and the test card that is used to measure bright hangover time that are used to measure dark trailing time;

Described become the dark trailing time test card mainly by some groups of levels/or the brightness of vertical arrangement be that 100% figure constitutes; Every group of brightness is that 100% figure is that 100% little figure is formed by several brightness again, and each brightness is that 100% little figure is the interval of 0% brightness each other; It is big or small at interval to be one-level number sequence row; Between the figure of every group 100% brightness by brightness be 10% horizontal stripe/or vertical bar separate; In the centre of test card, be provided with a brightness perseverance and be 100% bright and brightness perseverance and be 0% phaeodium;

Described become bright hangover time test card mainly by some groups of levels/or the brightness of vertical arrangement be that 0% figure constitutes; Every group of brightness is that 0% figure is that 0% little figure is formed by several brightness again, and each brightness is that 0% little figure is the interval of 100% brightness each other; It is big or small at interval to be one-level number sequence row; Between the figure of every group 0% brightness by brightness be 90% horizontal stripe/or vertical bar separate; In the centre of test card, be provided with a brightness perseverance and be 0% phaeodium and brightness perseverance and be 100% bright phaeodium;

Described formation become the figure of the figure of 100% brightness of the bright hangover time test card and the dark trailing time test card that becomes and 0% brightness and the interval between them thereof integrally with constant speed periodically in tested display cocycle reciprocating motion.

Constituting the described gap size that becomes the dark trailing time test card and the bright hangover time test card that becomes is arithmetic progression or Geometric Sequence.

When adopting the custom-designed motion video hangover time of the present invention test card that the motion video hangover time of various display/display screens is measured,, just can record hangover time exactly as long as examine the actual effect of resolution chart hangover.This method is simple to operate, thus the cost of lowering apparatus greatly, and its measurement result conforms to actual effect, and precision also reaches practical requirement.

In addition, application prospect of the present invention is extensive.Now, computer also usually is used for the show events image, and the measurement of response time will progressively be replaced by the measurement of hangover time, and this method of measurement can be applicable to metering computer with the evaluation of display to the display performance of active images.This method can also be applicable to the measurement of the motion video hangover time of the TV of any kind of or computer display and display screen.

Description of drawings

Figure 1A is used to measure the become test card of dark hangover (bright hangover) time of motion video for the present invention

Figure 1B is used to measure the motion video bright hangover test card of (dark hangover) time that becomes for the present invention

Fig. 2 A is used to measure the become test card of dark hangover (bright hangover) time of motion video for another kind of the present invention

Fig. 2 B is used to measure the motion video bright hangover test card of (dark hangover) time that becomes for another kind of the present invention

Another is used to measure the become test card of dark hangover (bright hangover) time of motion video to Fig. 3 A for the present invention

Another is used to measure the motion video bright hangover test card of (dark hangover) time that becomes to Fig. 3 B for the present invention

Embodiment

The test card that being used to of the present invention design measured various displays/display screen motion video hangover time comprises a test card and a test card that is used to measure bright hangover time that is used to measure dark trailing time, the supporting use of these two cards.Figure 1A, Figure 1B are cover motion video hangover time test cards, and Fig. 2 A, Fig. 2 B are another set of motion video hangover time test cards, and Fig. 3 A, Fig. 3 B are another cover motion video hangover time test cards.

Shown in Figure 1A, the brightness that the test card of dark hangover (bright hangover) time that is used for measuring provided by the invention is mainly arranged by some groups of levels (or vertical) is that 100% figure constitutes; Every group of brightness is that 100% figure is that 100% little figure 1 is formed by several brightness again, and each brightness is that 100% little figure 1 is the interval 2 of a series of 0% brightness each other.In specific embodiments of the invention, the dark trailing time test card that becomes is to comprise that by five groups horizontal every group four brightness are that 100% bright circle 1 constitutes.Shown in Figure 1A, several brightness that constitute every group of brightness and be 100% figure are that 100% little figure 1 is the interval 2 of 0% brightness each other, its at interval 2 size be one-level number sequence row, these one-level number sequence row can be arithmetic progression or Geometric Sequence.In the actual measurement process, people can determine its sequence number and gap size thereof in sequence intuitively according to the position at interval 2.The distance of supposing little figure 1 motion in each field duration is d, constitute every group of brightness and be 100% little figure 1 interval 2 each other as shown in the figure, first row are respectively 0.2d, 0.4d, 0.6d, 0.8d, 1.0d from top to bottom with secondary series pattern spacing 2, secondary series and the 3rd row pattern spacing 2 are respectively 1.2d, 1.4d, 1.6d, 1.8d, 2.0d from top to bottom, and the 3rd row are respectively 2.2d, 2.4d, 2.6d, 2.8d, 3.0d from top to bottom with the 4th row pattern spacing 2.And for example shown in Figure 1A, constituting between the figure of every group 100% brightness of dark test card by brightness is that 10% horizontal stripe (or vertical bar) 3 separates, it is the reference brightness that needs in measuring, and the display brightness at its each interval 2 all can compare with this reference brightness at any time when figure 1 motion.In the centre of test card, be provided with a brightness perseverance and be bright 4 and brightness perseverances of 100% and be 0% phaeodium 5, they are the concrete brightness number that are used for measuring 100% and 0% correspondence.Brightness to zone, the both sides (or up and down) of every block graphics 6 has no special requirements, and this example is got 0% brightness.

The dark trailing time test card is matching used to be used for measuring the bright hangover test card of (dark hangover) time to Figure 1B for provided by the invention and Figure 1A become, the brightness that it is mainly arranged by some groups of levels (or vertical) is 0% figure formation, every group of brightness is that 0% figure is that 0% little figure 1 ' is formed by several brightness again, each brightness be 0% little figure 1 ' each other for the interval 2 ' of a series of 100% brightness in specific embodiments of the invention, the bright hangover time test card that becomes is to comprise that by five groups horizontal every group four brightness are that 0% bright circle 1 ' constitutes.Shown in Figure 1B, several brightness that constitute every group of brightness and be 0% figure be 0% little figure 1 ' be each other 100% brightness interval 2 ' its 2 ' be one-level number sequence row for a short time at interval, it can be arithmetic progression or Geometric Sequence that this one-level number sequence is listed as.In the actual measurement process, people can determine its sequence number and gap size thereof in sequence intuitively according to the position at interval 2 '.The distance of supposing figure 1 ' motion in each field duration is d, the brightness that constitutes every group be 0% little figure 1 ' interval 2 ' each other as shown in the figure, first row are respectively 0.2d, 0.4d, 0.6d, 0.8d, 1.0d from top to bottom with secondary series pattern spacing 2 ', secondary series and the 3rd row pattern spacing are respectively 1.2d, 1.4d, 1.6d, 1.8d, 2.0d from top to bottom, and the 3rd row are respectively 2.2d, 2.4d, 2.6d, 2.8d, 3.0d from top to bottom with the 4th row pattern spacing.And for example shown in Figure 1B, constituting between the figure 1 of every group 0% brightness of bright hangover time test card by brightness is that 90% horizontal stripe (or vertical bar) 3 ' separates, it is the reference brightness that needs in measuring, and the display brightness at its each interval 2 ' all can compare with this reference brightness at any time when figure 1 ' motion.In the centre of test card, be provided with a brightness perseverance and be 0% phaeodium 4 ' and brightness perseverance and be 100% bright phaeodium 5 ', they are the concrete brightness number that are used for measuring 0% and 100% correspondence.Brightness to zone, the both sides (or up and down) of every block graphics 6 ' has no special requirements, and this example is got 100% brightness.

In a cover test card, the difference of the become bright hangover time test card and the dark trailing time test card that becomes only is: the brightness of (1) figure 1 becomes 0% by 100%; (2) brightness at the interval between the figure 12 becomes 100% by 0%; (3) reference brightness between every block graphics becomes 90% by 10%; Other content is all constant.

In actual test process, become bright hangover time test card and become in the dark trailing time test card figure 1 and at interval 2 integrally with constant speed periodically towards a direction motion, when they move to the border of a side, enter picture once more from relative another side again, so move in endless cycles.Perhaps, figure 1 and at interval 2 integrally constant but speed that direction changes is back and forth made back and forth movement between two borders with size.When figure 1 periodically with the speed of known dimensions during in display screen cocycle campaign, people can be by observing the readability at figure 1 interval 2 each other, it is just in time corresponding with corresponding hangover time at interval which is judged, and determine its length according to the position at this interval, and then determine, thereby calculate the motion video hangover time through this required at interval run duration.

In the embodiment of the invention 1 (referring to Figure 1A, Figure 1B), become the dark trailing time test card and the bright hangover time test card that becomes be by five groups of horizontal positioned every group comprise four brightness be 100% or brightness be that 0% little bright circle constitutes, certainly, it also can be by 4 groups, 6 groups, 8 groups, 10 groups, 15 groups ..., every group comprise 3,5,8,10 ... brightness be 100% or brightness be that other figure of 0% is arranged by level or vertical direction and formed.But increase to constitute the graphical set number range extension of test card, 2 increment can improve certainty of measurement and reduce between the figure at interval.

Shown in Fig. 2 A, Fig. 2 B, in the 2nd embodiment of the present invention, become the dark trailing time test card and become bright hangover time test card by every group of 10 groups of horizontal positioned comprise 3 brightness be 100% or brightness be that 0% rectangle 11 is formed.

Shown in Fig. 2 A, the test card of dark hangover (bright hangover) time that is used for measuring is that 100% figure constitutes by 10 groups of horizontal brightness; Every group of brightness is that 100% figure is that 100% small rectangle 11 is formed by 3 brightness again; Each brightness is that 100% small rectangle 11 is the interval 12 of a series of 0% brightness each other, the size at its interval 12 is one-level number sequence row, for example, the distance of supposing figure 11 motions in each field duration is d, the brightness that constitutes every group is the interval 12 between 100% the small rectangle 11, first row are respectively 0.1d from top to bottom with the size at secondary series interval 12 as shown in the figure, 0.2d, 0.3d, 0.4d, 0.5d, 0.6d, 0.7d, 0.8d, 0.9d, 1.0d secondary series and the 3rd row are respectively 1.1d from top to bottom, 1.2d, 1.3d, 1.4d, 1.5d, 1.6d, 1.7d, 1.8d, 1.9d, 2.0d.And for example shown in Fig. 2 A, be that 10% horizontal stripe 3 separates by brightness between every group 100% brightness figure, it is the reference brightness that needs in measuring.In the centre of test card, be provided with a brightness perseverance and be bright 4 and brightness perseverances of 100% and be 0% phaeodium 5, they are the concrete brightness number that are used for measuring 100% and 0% correspondence.Brightness to the two side areas 6 of every block graphics has no special requirements, and this example is got 0% brightness.

Fig. 2 B for Fig. 2 A matching used bright hangover test card of (dark hangover) time that is used for measuring of dark trailing time test card that becomes, the difference of the dark trailing time test card that becomes that it and Fig. 2 A represent only is: the brightness of (1) figure 11 becomes 0% by 100%; (2) brightness at the interval between the figure 11 12 becomes 100% by 0%; (3) brightness of the horizontal stripe between every block graphics 3 (reference brightness) becomes 90% by 10%; Other content is all constant.

Fig. 3 A, Fig. 3 B are another become the dark trailing time test card and bright hangover time test card that becomes disclosed by the invention, it and embodiment 2 disclosed test cards are much at one, its difference only is: the zone 6 that requires is not done in the dark trailing time test card that will become (referring to Fig. 3 A) both sides to brightness brightness becomes 100% from 0%, make zone 6 with about two row brightness be that 100% figure 11 merges; To become bright hangover time test card (referring to Fig. 3 B) both sides do not do the zone 6 that requires to brightness brightness becomes 0% from 100%, make zone 6 with about two row brightness be that 0% figure 11 merges.

In addition, need to prove: 10% or 90% the reference brightness that constitutes test card is the certainty of measurement that horizontal stripe 3 is related to hangover time, because in measuring process, the display brightness at its each interval 2 all will compare with this reference brightness at any time when figure 1 motion.Though the signal level of test card with require brightness corresponding, but how much there are differences between the individual character of display and the uniform requirement, so, when accurately measuring, should detect 100%, 0%, 10% or 90% brightness, and fine setting brightness, contrast meet them requirement is set.

Can to represent Quan Liang, 0% brightness to represent complete black in 100% brightness in the test card, and the measurement result representative becomes bright and the dark trailing time that becomes when complete bright full night saltus step.Yet, 100% does not necessarily represent brightly entirely, and 0% does not necessarily represent entirely black yet, can represent certain higher brightness and certain than low-light level respectively, and determine 10% or 90% reference brightness with this, the measurement result representative becomes bright and the dark trailing time that becomes during saltus step between these two GTGs.

The making of test card can be adopted multiple scheme.For example: 1, manufacture a lamp box stage property, multi-picture is drawn in requirement by figure of the present invention and brightness, mode with similar revolving horse lantern is moved it circularly, with the guide pillar guiding of rolling, become flat state when making picture, take and be recorded on the video tape, perhaps further be made into VCD, DVD disc with video camera through the lamp box front, broadcast with corresponding apparatus (video tape recorder/VCD machine/DVD player), just obtain required test card signal; Perhaps, 2, draw each picture in the period of motion by the requirement of figure of the present invention and brightness, be made into film, be made into video tape with " glue commentaries on classics magnetic " equipment, perhaps further be made into VCD, DVD disc, broadcast with corresponding apparatus (video tape recorder/VCD machine/DVD player), just obtain required test card signal; All right, 3, make each datagram in the period of motion by the requirement of figure of the present invention and brightness, with each electron image of the computer loop play with TV image output function, just obtain required test card signal; Perhaps, 4, each the datagram in period of motion will making broadcasts with the special electronic equipment (signal source) of each electron image of energy loop play, just obtains required test card signal; And so on.Beijing Co., Ltd of tree peony electronics group has produced multiple digital television devices (as MDW1862/1869 type DTV special signal generator) according to the 4th kind of scheme, can provide HDTV and SDTV, 50 and 60, interlacing and line by line each clock scanning specification the dark trailing time that becomes, bright hangover time test card signal becomes.

Integrate as will become the dark trailing time test card and the bright hangover time test card that becomes, for example half range is got the live part of Fig. 3 A, and half range is got the live part of Fig. 3 B in addition, just can measure dark trailing time respectively and the bright hangover time that becomes with a test card.Just brightness, two kinds of adjustings of contrast are difficult to make 100%, 0%, 10%, 90% 4 kind of brightness meets simultaneously requirement is set, so this test card is only applicable to the less demanding occasion of certainty of measurement.

Introduce method how to utilize above-mentioned motion video hangover time test card to measure the motion video hangover time below, this method of measurement is directly to read hangover time according to the practical manifestation of motion video hangover.

This method of measurement may further comprise the steps:

The first step: select the suitable hangover time test card of specification and broadcast equipment.

Tested display has different class, though same display can not change by different hangover times because of the definition of displayed image, the display of different class has its corresponding reading scan form.Do not meet as the scan format of input signal and the reading scan form of display, might can't show, enable promptly to show that also may be earlier input signal be become the scan format that display can show through the scan format translation circuit and give demonstration again, this conversion may influence measurement result.Therefore before measuring, at first will understand the scan format that tested display can directly show, the numerical value of field frequency is especially selected the particularly test card signal that conforms to of field frequency and broadcast equipment accordingly of scan format.If the field frequency of the reading scan form of display is Fv, field duration Tc=1/Fv then, it is to calculate the critical data that measurement result be unable to do without.

Second step: be familiar with the technical parameter of hangover time test card, grasp by each and determine the method for reading x at interval in the position in test card at interval.

The key in this step is according to the position of the interval 2 between each figure 1 on the test card on card, expertly determines its sequence number and corresponding intervals reading value x thereof in intervening sequence.

For example: among Figure 1A, first row are 0.8d with the spacing size at 2 intervals 2, several from top to bottom the 4th intervals of secondary series 100% bright circle 1, its corresponding intervals reading value x=0.8.

The 3rd step: connect and broadcast equipment and tested display/display screen, broadcast test card, adjust the brightness and contrast of display screen

The output signal of the hangover time test card being broadcast equipment is connected on the signal input part of display to be measured, broadcasts test card, correctly adjusts the operating state of display to be measured, makes it show the normal periodically test card image of movement at the uniform velocity.Accurately measure as need, measure 100%, 0%, 10% or 90% brightness, and fine setting brightness, contrast meet them requirement is set with luminance meter.

The 4th step: examine conditions of streaking, find out on the dark trailing time test card that becomes of dynamically broadcasting with the dark trailing time that becomes corresponding that at interval on sequence number and the corresponding intervals reading value x1 thereof in intervening sequence and the bright hangover time test card that becomes with corresponding that sequence number and the corresponding intervals reading value x2 thereof in intervening sequence at interval of the bright hangover time that becomes

The 5th step: read hangover time, the dark trailing time that becomes equals x1Tc, the bright hangover time that becomes equals x2Tc.

Above-mentioned the 4th step is a step of most critical in measuring.

Be example with Figure 1A earlier, specify the result who how to obtain dark trailing time.If hangover time is 0 or extremely short, the image that we see is the translation that sharply marginated circle is made horizontal direction, and dark interval 2 all is clear debating (picture tube is exactly like this) between any two circles.If hangover time is not 0, bright circle stays the brightness hangover of deepening gradually at inner room following closely in 2, and 2 border thickens unclear at interval.Hangover time is long more, and fuzzy region is wide more, those original little dark intervals 2, can all be covered by fuzzy and hangover that have higher brightness, those original very big inner rooms every, part can be covered by fuzzy hangover, but can stay long or short dark part (its brightness is lower than 10%).Except hangover time ultrashort (for this card, less than 0.2Tc) or the hangover time speciality (for this card, greater than 3Tc), always can find an x1d at interval, it and all covered than its also little interval by hangover, and than what also stay not the interval (in this interval, brightness is lower than 10%) that is covered by hangover in its big interval, with interval x1d time corresponding x1Tc be exactly the dark trailing time that becomes that we will measure.Because the field duration of supposing the test card iterative motion is Tc, the distance that test card moved within a field duration Tc is d, is the interval of x1d for width so, the figure on the test card move this x1d at interval required run duration be x1Tc.For example, among Figure 1A, a left side rise secondary series from bottom to top first at interval the brightness overall height in (1.2d) promptly covered by bright hangover entirely in 10%, show that hangover time should be more than or equal to interval 1.2d time corresponding 1.2Tc, and have clear brightness of debating to be lower than 10% interval in second interval (1.4d) from bottom to top, show that hangover time is significantly less than 1.4Tc and the dark trailing time that becomes can be judged to be 1.2Tc so; If brightness is lower than 10% interval and mays be seen indistinctly in the interval of 1.4d, show hangover time just less than 1.4Tc, the dark trailing time that becomes can be judged to be 1.3Tc so.In such measurement, reading is differential to be 0.1Tc, and range is 3Tc.If field frequency is 50Hz, Tc=20ms, 1.2Tc=24ms, reading is differential to be 2ms, range is 60ms.

See situation about measuring again with the dark trailing time test card that becomes of Fig. 2 A or Fig. 3 A.In the test, which of which row that examines the vertical sleeper of two row of horizontal movement begins that at interval the interval that is lower than 10% brightness is arranged, i.e. the decidable hangover time.For example; Secondary series second interval 1.2d (1.2d from bottom to top played on a left side, corresponding 1.2Tc) can't see the interval that is lower than 10% brightness in, show that hangover is more than or equal to 1.2Tc, as among the 3rd the interval 1.3d (the corresponding 1.3Tc of 1.3d) interval that is lower than 10% brightness being arranged obviously from bottom to top, show that but hangover time is significantly less than 1.3Tc interpretation hangover time and equals 1.2Tc, may be seen indistinctly as the interval that is lower than 10% brightness in the 3rd interval from bottom to top, show hangover time just less than 1.3Tc, declare hangover time so and equal 1.25Tc.This card reading is differential to be 0.05Tc, and range is 2Tc.

When in like manner, measuring with the bright hangover time test card of becoming of Figure 1B.If hangover time is 0 or minimum, clear the debating in bright interval between any two circles.If hangover time is not 0, dark circle just has dark hangover, the bright hangover time that becomes is long more, dark hangover is just long more, those original little bright intervals can all be covered the bright interval that those original width are bigger by fuzzy darker hangover, part can be covered by fuzzy hangover, but can stay long or short highlights branch (brightness is higher than 90%).Except hangover time ultrashort (for this card, less than 0.2Tc) or the hangover time speciality (for this card, greater than 3Tc), always can find an x2d at interval, it and all covered (brightness is lower than 90%) than its also little interval by darker hangover, and than what also leave not the interval (in this interval, brightness is higher than 90%) that is covered by hangover in its big interval, with interval x2d time corresponding x2Tc be exactly the bright hangover time that becomes that we will measure.For example, if among Figure 1B a left side rise first row from top to bottom the 4th at interval among the 0.8d brightness be lower than 90% entirely, show that hangover time is more than or equal to 0.8Tc, and have clear brightness of debating to be higher than 90% interval among the next interval 1.0d, show that hangover time is significantly less than 1.0Tc, the bright hangover time that becomes can be judged to be 0.8Tc so, if brightness is higher than 90% interval and mays be seen indistinctly in the interval of 1.0d, show hangover time just less than 1.0Tc, the bright hangover time that becomes can be judged to be 0.9Tc so.For the bright hangover time test card of becoming of Fig. 2 B or Fig. 3 B, which of which row that examines the vertical bright post of two row of horizontal movement begins that at interval the interval that is higher than 90% brightness is arranged, i.e. the decidable hangover time.For example; A left side is played first row and be can't see the interval that is higher than 90% brightness in the 8th the interval 0.8d (corresponding 0.8Tc) from top to bottom, show that hangover time is more than or equal to 0.8Tc, among the 0.9d (corresponding 0.9Tc) interval that is higher than 90% brightness is arranged obviously at interval as the next one, show that hangover time is significantly less than 0.9Tc, but the interpretation hangover time equals 0.8Tc, may be seen indistinctly as the interval that is higher than 90% brightness in the next one interval, show hangover, declare hangover time so and equal 0.85Tc just less than 0.9Tc.

In a word, when adopting the custom-designed motion video hangover time of the present invention test card that the motion video hangover time of various display/display screens is measured,, just can record hangover time exactly as long as examine the actual effect of resolution chart hangover.This method is simple to operate, thus the cost of lowering apparatus greatly, and its measurement result conforms to actual effect, and precision also reaches practical requirement.

The above is preferred embodiment of the present invention only, and protection scope of the present invention is not limited thereto.Anyly all belong within the protection range of the present invention based on the equivalent transformation on the technical solution of the present invention.

Claims

1, a kind of method of measuring the motion video hangover time, it is characterized in that: this method of measurement may further comprise the steps:

Described motion video hangover time test card comprises the test card and the test card that is used to measure bright hangover time that are used to measure dark trailing time;

Described become the dark trailing time test card by some groups of levels/or the brightness of vertical arrangement be that 100% figure constitutes; Every group of brightness is that 100% figure is that 100% little figure is formed by several brightness again, and each brightness is that 100% little figure is the interval of 0% brightness each other; It is big or small at interval to be one-level number sequence row; Between the figure of every group 100% brightness by brightness be 10% horizontal stripe/or vertical bar separate; In the centre of test card, be provided with a brightness perseverance and be 100% bright and brightness perseverance and be 0% phaeodium;

Described become bright hangover time test card by some groups of levels/or the brightness of vertical arrangement be that 0% figure constitutes; Every group of brightness is that 0% figure is that 0% little figure is formed by several brightness again, and each brightness is that 0% little figure is the interval of 100% brightness each other; It is big or small at interval to be one-level number sequence row; Between the figure of every group 0% brightness by brightness be 90% horizontal stripe/or vertical bar separate; In the centre of test card, be provided with a brightness perseverance and be 0% phaeodium and brightness perseverance and be 100% bright phaeodium;

2, a kind of method of measuring the motion video hangover time according to claim 1 is characterized in that: constituting the described gap size that becomes the dark trailing time test card and the bright hangover time test card that becomes is arithmetic progression.

3, a kind of method of measuring the motion video hangover time according to claim 1 is characterized in that: constituting the described gap size that becomes the dark trailing time test card and the bright hangover time test card that becomes is Geometric Sequence.

4, a kind of method of measuring the motion video hangover time according to claim 1 and 2 is characterized in that: the described dark trailing time test card that becomes is that 100% figure constitutes by 5 groups of horizontal brightness; Every group of brightness is that 100% figure is that 100% little bright circle is formed by 4 brightness again, and each brightness is that 100% little bright circle is the interval of 0% brightness each other; It is big or small at interval to be one-level number sequence row, promptly first row are respectively 0.2d, 0.4d, 0.6d, 0.8d, 1.0d at interval from top to bottom with the bright circle of secondary series, secondary series and the bright circle of the 3rd row are respectively 1.2d, 1.4d, 1.6d, 1.8d, 2.0d at interval from top to bottom, and the 3rd row are respectively 2.2d, 2.4d, 2.6d, 2.8d, 3.0d at interval from top to bottom with the bright circle of the 4th row; Between the figure of every group 100% brightness by brightness be 10% horizontal stripe/or vertical bar separate; In the centre of test card, be provided with a brightness perseverance and be 100% bright and brightness perseverance and be 0% phaeodium; Described d is the distance of little bright circular motion in each field duration;

The described bright hangover time test card that becomes is that 0% figure constitutes by 5 groups of horizontal brightness; Every group of brightness is that 0% figure is that 0% little bright circle is formed by 4 brightness again, and each brightness is that 0% little bright circle is the interval of 100% brightness each other; It is big or small at interval to be one-level number sequence row, promptly first row are respectively 0.2d, 0.4d, 0.6d, 0.8d, 1.0d at interval from top to bottom with the bright circle of secondary series, secondary series and the bright circle of the 3rd row are respectively 1.2d, 1.4d, 1.6d, 1.8d, 2.0d at interval from top to bottom, and the 3rd row are respectively 2.2d, 2.4d, 2.6d, 2.8d, 3.0d at interval from top to bottom with the bright circle of the 4th row; Be that 90% horizontal stripe separates by brightness between the figure of every group 0% brightness; In the centre of test card, be provided with a brightness perseverance and be 0% phaeodium and brightness perseverance and be 100% bright phaeodium; Described d is the distance of little bright circular motion in each field duration; Described formation become the figure of the figure of 100% brightness of the bright hangover time test card and the dark trailing time test card that becomes and 0% brightness and the interval between them thereof integrally with constant speed periodically in tested display cocycle reciprocating motion.

5, a kind of method of measuring the motion video hangover time according to claim 1 and 2 is characterized in that: the test card of the described dark trailing time that becomes is that 100% figure constitutes by 10 groups of horizontal brightness; Every group of brightness is that 100% figure is that 100% small rectangle is formed by 3 brightness again; Each brightness is that 100% small rectangle is the interval of 0% brightness each other, it is big or small at interval to be one-level number sequence row, promptly, first row are respectively 0.1d, 0.2d, 0.3d, 0.4d, 0.5d, 0.6d, 0.7d, 0.8d, 0.9d, 1.0d at interval from top to bottom with the small rectangle of secondary series 100% brightness, and the small rectangle of secondary series and 100% brightness of the 3rd row is respectively 1.1d, 1.2d, 1.3d, 1.4d, 1.5d, 1.6d, 1.7d, 1.8d, 1.9d, 2.0d at interval from top to bottom; Be that 10% horizontal stripe separates by brightness between every group 100% brightness figure; In the centre of test card, be provided with a brightness perseverance and be 100% bright and brightness perseverance and be 0% phaeodium; Described d is the distance of small rectangle motion in each field duration;

The test card of the described bright hangover time that becomes is that 0% figure constitutes by 10 groups of horizontal brightness; Every group of brightness is that 0% figure is that 0% small rectangle is formed by 3 brightness again; Each brightness is that 0% small rectangle is the interval of 100% brightness each other, it is big or small at interval to be one-level number sequence row, promptly, first row are respectively 0.1d, 0.2d, 0.3d, 0.4d, 0.5d, 0.6d, 0.7d, 0.8d, 0.9d, 1.0d at interval from top to bottom with the small rectangle of secondary series 0% brightness, and the small rectangle of secondary series and 100% brightness of the 3rd row is respectively 1.1d, 1.2d, 1.3d, 1.4d, 1.5d, 1.6d, 1.7d, 1.8d, 1.9d, 2.0d at interval from top to bottom; Be that 90% horizontal stripe separates by brightness between every group 0% brightness figure; In the centre of test card, be provided with a brightness perseverance and be 100% bright and brightness perseverance and be 0% phaeodium; Described d is the distance of small rectangle motion in each field duration;

Described formation become the figure of the figure of 100% brightness of the bright hangover time test card and the dark trailing time test card that becomes and 0% brightness and the interval integral body between them thereof with constant speed periodically in tested display cocycle reciprocating motion.