CN105231988A - Method for regulating sighting mark moving speed in dynamic visual acuity testing system - Google Patents
Method for regulating sighting mark moving speed in dynamic visual acuity testing system Download PDFInfo
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- CN105231988A CN105231988A CN201510784319.2A CN201510784319A CN105231988A CN 105231988 A CN105231988 A CN 105231988A CN 201510784319 A CN201510784319 A CN 201510784319A CN 105231988 A CN105231988 A CN 105231988A
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- sighting target
- sighting mark
- visual acuity
- moving speed
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Abstract
The invention provides a method for regulating the sighting mark moving speed in a dynamic visual acuity testing system. By adopting the method, the sighting mark moving speed can be arbitrarily regulated, and the qualification degree of a driver on a specific task can be truly reflected. The method comprises the following steps: (1) starting; (2) acquiring a sighting mark moving speed v; (3) acquiring the distance d between a tested person and the sighting mark; (4) calculating a sighting mark actual moving speed v1 according to a formula (1); (5) acquiring a single pixel width s and a sighting mark generation frequency f of a display screen; (6) calculating a pixel per inch u of a sighting mark in the adjacent frame moving on the display screen according to a formula (2); and (7) finishing.
Description
Technical field
The invention belongs to the technical field that vision detects, particularly relate to the control method of sighting target movement velocity in a kind of dynamic visual acuity test macro.
Background technology
The optic resolving power of observer when dynamic visual acuity refers to and there is relative motion between object observing and observer.Can the quality of dynamic visual acuity be closely related with the task that complete under kinestate.Therefore, dynamic visual acuity detects at all kinds of human pilot of inspection, improves in driver training effect and plays an important role.Meanwhile, dynamic visual acuity detects or selects the important step of aircrew, to the flying score improving pilot, improves its fighting efficiency important role.
In conventional dynamic eyesight testing, the movement velocity of sighting target is changeless, because different task requires different to the dynamic object respond of friction speed, namely testee under friction speed sighting target motion reaction and inconsistent, perhaps the sighting target motion of testee to certain speed is more responsive, but slow to the sighting target motor reaction under other speed.In actual test, can reflect for specifying the vision horizontal checkout of sighting target movement velocity the degree that driver completes particular job task.
Summary of the invention
The technical problem to be solved in the present invention is the defect overcoming prior art, the control method of sighting target movement velocity in a kind of dynamic visual acuity test macro is provided, it can regulate arbitrarily sighting target movement velocity, thus reflects the competence level of driver to particular job task more truly.
The technical scheme solved the problem is: the control method of sighting target movement velocity in this dynamic visual acuity test macro, and it comprises the following steps:
(1) start;
(2) setting sighting target movement velocity v is obtained;
(3) the distance d between testee and sighting target is obtained;
(4) sighting target actual motion speed v is obtained according to formula (1)
1
v
1＝v×d/30(1)；
(5) single pixel wide s and the sighting target generated frequency f of display screen is obtained;
(6) obtain according to formula (2) the pixel count u that consecutive frame sighting target moves on a display screen
U＝v
1/(s×f)(2)；
(7) terminate.
The present invention obtains sighting target actual motion speed v by setting sighting target movement velocity v and the distance d between testee and sighting target
1the pixel count u that consecutive frame sighting target moves on a display screen is obtained again by the single pixel wide s of display screen and sighting target generated frequency f, thus just can adjust according to the sighting target movement velocity of setting the pixel count u that consecutive frame sighting target moves on a display screen, therefore, it is possible to sighting target movement velocity can be regulated arbitrarily, thus reflect the competence level of driver to particular job task more truly.
Accompanying drawing explanation
Fig. 1 is distance d between testee and sighting target and graph of a relation between sighting target speed.
Fig. 2 is the flow chart according to the control method of sighting target movement velocity in dynamic visual acuity test macro of the present invention.
Detailed description of the invention
As shown in Figure 2, the control method of sighting target movement velocity in this dynamic visual acuity test macro, it comprises the following steps:
(1) start;
(2) setting sighting target movement velocity v is obtained;
(3) the distance d between testee and sighting target is obtained;
(4) sighting target actual motion speed v is obtained according to formula (1)
1
v
1＝v×d/30(1)；
(5) single pixel wide s and the sighting target generated frequency f of display screen is obtained;
(6) obtain according to formula (2) the pixel count u that consecutive frame sighting target moves on a display screen
U＝v
1/(s×f)(2)；
(7) terminate.
The present invention obtains sighting target actual motion speed v by setting sighting target movement velocity v and the distance d between testee and sighting target
1the pixel count u that consecutive frame sighting target moves on a display screen is obtained again by the single pixel wide s of display screen and sighting target generated frequency f, thus just can adjust according to the sighting target movement velocity of setting the pixel count u that consecutive frame sighting target moves on a display screen, therefore, it is possible to sighting target movement velocity can be regulated arbitrarily, thus reflect the competence level of driver to particular job task more truly.
In addition, in described step (5), sighting target generated frequency f span is 25-50.Sighting target generated frequency f chooses according to the custom of designer.F value is higher, and image display refresher rate is fast, and sighting target motion continuity is effective; But sighting target generated frequency is too high proposes high requirement to processing speed, CPU processing speed burden.
Below describe the present invention in detail.
The present invention develops a kind of dynamic visual acuity method of testing, and sighting target motion can continuous change, has the continuously adjustable dynamic visual acuity detection method of speed.Set in sighting target generation system sighting target opening direction comprise " upper, upper right, the right side, bottom right, under, lower-left, a left side, upper left " these eight gears, eight gears occur according to random equiprobability mode.After dynamic visual acuity test starting, computer random produces a sighting target direction, and this direction is constant to 0.1 grade whole sighting target life span direction from 1.6 change of rank at sighting target.In dynamic visual acuity viewing area, the sighting target of 1.6 grades linear uniform motion to the right on the left of screen, sighting target moves to screen right-hand member, and sighting target disappears.Then the sighting target of 1.5 vision grades linear uniform motion to the right on the left of screen, sighting target moves to screen right-hand member, and sighting target disappears.Then the sighting target of 1.4 vision grades occurs, such iterative cycles, until 0.1 grade sighting target linear uniform motion to the right on the left of screen, sighting target moves to screen right-hand member, and sighting target disappears.At whole sighting target life span, once testee identifies sighting target opening direction, stir single pole, if single pole direction is consistent with sighting target opening direction, correct judgment is described, corresponding dynamic visual acuity testing level is provided; If stir single pole direction and sighting target opening direction is inconsistent, prompting test result mistake.
There is provided dynamic visual testing sign movement velocity continuously adjustable method of testing in the present invention, continuous change can be realized, if sighting target movement velocity is adjusted to minima 1, sighting target moves right with minimum speed 1m/s movement velocity, if sighting target movement velocity is adjusted to maximum 100, sighting target at full throttle 100m/s movement velocity moves right.Sighting target movement velocity during 1-100m/s, arbitrary value continuously adjustabe.
In sighting target test macro, the definition of sighting target movement velocity refers to the movement velocity v1 of sighting target apart from sighting target during testee 30 meters, and now the relative testee angular velocity of satellite motion of sighting target is α.As shown in Figure 1, when tested distance d changes, dynamic visual acuity test macro requires that the relative testee angular velocity of satellite motion of dynamic visual testing sign remains unchanged, and therefore needs target speed in adjustment sighting target generation system.Its speed v 1 computing formula is as shown in formula (1):
v
1＝v×d330(1)
In above formula:
V1-sighting target actual motion speed (unit: m/s);
Speed in v-sighting target motion index
The spacing of d-sighting target and testee
Formula (2) represents relation between sighting target current kinetic speed v 1 and sighting target motion pixel u
u＝v
1/(s×f)(2)
In above formula:
In u – sighting target generation system, consecutive frame sighting target moves how many pixels over the display
The each pixel wide (m) of s-display
F-sighting target generated frequency (hz).
By formula (1), (2), as long as the single pixel wide s of input display in a test system, sighting target and testee distance d, and test request speed v, these three parameters, use any a display, any tested distance d, can realize specifying sighting target movement velocity index request.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Will be understood by those skilled in the art that, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong to the protection domain of technical solution of the present invention.
Claims (2)
1. the control method of sighting target movement velocity in dynamic visual acuity test macro, is characterized in that: it comprises the following steps:
(1) start;
(2) setting sighting target movement velocity v is obtained;
(3) the distance d between testee and sighting target is obtained;
(4) sighting target actual motion speed v is obtained according to formula (1)
1
v
1＝v×d/30(1)；
(5) single pixel wide s and the sighting target generated frequency f of display screen is obtained;
(6) obtain according to formula (2) the pixel count u that consecutive frame sighting target moves on a display screen
U＝v
1/(s×f)(2)；
(7) terminate.
2. method according to claim 1, is characterized in that: in described step (5), and sighting target generated frequency f span is 25-50.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510784319.2A CN105231988A (en) | 2015-11-16 | 2015-11-16 | Method for regulating sighting mark moving speed in dynamic visual acuity testing system |
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|---|---|---|---|
| CN201510784319.2A CN105231988A (en) | 2015-11-16 | 2015-11-16 | Method for regulating sighting mark moving speed in dynamic visual acuity testing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106333642A (en) * | 2016-09-27 | 2017-01-18 | 深圳市亮睛视觉研究所 | Dynamic vision test instrument and test method thereof |
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Application publication date: 20160113 |