CN107170028A - A kind of drafting standard UCVA table E method - Google Patents
A kind of drafting standard UCVA table E method Download PDFInfo
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- CN107170028A CN107170028A CN201710406499.XA CN201710406499A CN107170028A CN 107170028 A CN107170028 A CN 107170028A CN 201710406499 A CN201710406499 A CN 201710406499A CN 107170028 A CN107170028 A CN 107170028A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/60—Editing figures and text; Combining figures or text
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
- A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
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Abstract
The invention discloses a kind of drafting standard UCVA table E method, comprise the following steps：Step 1: by the display of a computer for being provided with vision drop software, obtaining reference standard card in pixel number evidence shared on display；The actual length of side of visual chart E words is obtained Step 2: calculating；Step 3: contrasting the actual length of side of E words using identity card developed width, E word actual ratios are obtained；Step 4: using identity card respective pixel width versus E word actual ratios, obtaining E word length of side pixels；Step 5: E words polar plot (square) drawn in system is carried out into pixel length of side limitation；Step 6: E word images are presented.The present invention draws actual standard UCVA table E size on the computer display from actual object size to different resolution, and can be according to distance values, equivalent scaling standard UCVA table E size, realize the consistent effect with actual eyesight measurement data, it is ensured that the accuracy and reliability of eyesight measurement data.
Description
Technical field
The present invention relates to UCVA examination technical field, more particularly to a kind of drafting standard UCVA table E method.
Background technology
At present, the UCVA examination activity of in the market is with the generaI investigation of UCVA table lamp box for specification, and testing eyesight needs
Prepare lamp board for standard logarithmic visual chart, visual mark indicating stick, hide the inspection equipment such as eye spoon.During inspection, eyesight test chart lamp box hangs over wall
On wall, the height of this line of visual chart 1.0, with tested eye in sustained height, by the surface of lamp box visual chart to those who are investigated's eye
The distance of ball surface be 5 meters or 2,5 meters, often 1 meter away from lamp box surface, 2 meters, 3 meters, 4 meters, 5 meters will do mark.Eyesight test chart lamp box
Lamp to use well, surface will clean, and sighting target writing is completely clear.Natural lighting and indoor light will avoid direct projection Visual chart lamp box for testing eyesight
Case, interior and the eyes of those who are investigated.When running into direct sunlight and getting in, white to be installed or blue curtain is blocked.Examined
Tested eyesight if person is seated, the face of eyes will be tested eyesight on 5 meters of remote lines if stand, and tiptoe will be in 5 meters of remote lines
Afterwards.
However, there is many defects in above-mentioned currently available technology, and it is the volume size issue of vision drop lamp box first, inspection
Front line staff is surveyed because place reason need to carry the UCVA table of multiple criterion distances, secondly, the data accuracy of detection with
And poor reliability, and labor intensive.
Therefore, in view of the above-mentioned drawbacks of the prior art, real be necessary to develop research to provide a kind of scheme, solve
The volume size issue of existing UCVA examination lamp box, and, it is ensured that accuracy, the reliability of testing result, reduce eyesight
The human and material resources cost and raising operating efficiency of census operations.
The content of the invention
In view of this, present invention aims at provide a kind of drafting standard UCVA table E method, the technical scheme
It is as follows：
A kind of drafting standard UCVA table E method, comprises the following steps：
Step 1: by the display of a computer for being provided with vision drop software, obtaining reference standard card in display
Shared pixel number evidence on device；
The actual length of side of visual chart E words is obtained Step 2: calculating；
Step 3: contrasting the actual length of side of E words using identity card developed width, E word actual ratios are obtained；
Step 4: using identity card respective pixel width versus E word actual ratios, obtaining E word length of side pixels；
Step 5: E words polar plot (square) drawn in system is carried out into pixel length of side limitation；
Step 6: E word images are presented.
Further, in step one, using second generation identity card as reference standard card, vision drop software is being installed
Computer on open vision drop software, set resolution ratio, second generation identity card is placed on the indicator screen of computer, obtain
Identity card is in the size on indicator screen.
Further, in step 2, calculated according to equation below and obtain the actual length of side of visual chart E words：
The actual length of side of E words=E interword gap values * 5；
Wherein, E interword gaps value=tan (the visual angle number of degrees) * measured distances；And the decimal of the visual angle number of degrees=1/ record * is effectively regarded
Angle.
Further, in step 3, the E words actual ratio=identity card developed width/actual length of side of E words.
The beneficial effect of technical scheme provided in an embodiment of the present invention is：
The present invention draws actual standard UCVA on the computer display from actual object size to different resolution
Table E size, and can be realized and actual eyesight measurement according to distance values, equivalent scaling standard UCVA table E size
The consistent effect of data, it is ensured that the accuracy and reliability of eyesight measurement data.Meanwhile, the present invention is based on national UCVA
The normalized form of table, is calculated computer picture, and draws out the E word UCVA tables with the equivalent size of reality, is realized
Eyesight is tested from entity lamp box, to the conversion using computer test eyesight, the volume of existing UCVA examination lamp box is solved
Size issue.
For the above and other objects, features and advantages of the present invention can be become apparent, preferred embodiment cited below particularly,
And coordinate institute's accompanying drawings, it is described in detail below.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 illustrates for the flow of the present invention.
Embodiment
To enable the object of the invention, feature, advantage more obvious and understandable, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that implementation disclosed below
Example is only a part of embodiment of the invention, and not all embodiments.Based on the embodiment in the present invention, those skilled in the art
The every other embodiment that member is obtained, belongs to the scope of protection of the invention.
Term " first ", " second " in description and claims of this specification and above-mentioned accompanying drawing etc. are to be used to distinguish
Similar object, without for describing specific order or precedence.It should be appreciated that the term so used is in appropriate feelings
It can be exchanged under condition, this is only the differentiation for describing to use the object of same alike result in description in embodiments of the invention
Mode.In addition, term " comprising " and " having " and their any deformation, it is intended that covering is non-exclusive to be included, so as to
Process, method, system, product or equipment comprising a series of units are not necessarily limited to those units, but may include unclear
Other units that ground is listed or for these processes, method, product or equipment inherently.
The embodiment of the present invention provides a kind of drafting standard UCVA table E method and differentiated from actual object size to different
Actual standard UCVA table E size is drawn on the computer display of rate, and can be according to distance values, equivalence scaling mark
Quasi- UCVA table E size, is realized and the consistent effects of actual eyesight measurement data, it is ensured that eyesight measurement data it is accurate
Property and reliability.Meanwhile, the normalized form of the invention based on national UCVA table is calculated computer picture, and paint
The E word UCVA tables with the equivalent size of reality are made, realizes from entity lamp box and tests eyesight, to utilizing computer test eyesight
Conversion, solves the volume size issue of existing UCVA examination lamp box.
The method for drawing standard UCVA table E refering to Fig. 1, the embodiment of the present invention, comprises the following steps：
Step 1: by the display of a computer for being provided with vision drop software, obtaining reference standard card in display
Shared pixel number evidence on device.
Specifically, using second generation identity card as reference standard card, opened being provided with the computer of vision drop software
Vision drop software, sets resolution ratio, second generation identity card is placed on the indicator screen of computer, obtains identity card in display
Size on device screen, i.e., the pixel number evidence shared by current identity card；Specifically, by adjusting vision drop software
Resolution ratio lines, obtain the corresponding elemental area size of identity card.
The actual length of side of visual chart E words is obtained Step 2: calculating；
Pass through below equation：
The effective visual angles of the decimal of the visual angle number of degrees=1/ record *；
E interword gaps value=tan (the visual angle number of degrees) * measured distances；
The actual length of side of E words=E interword gap values * 5.
Step 3: contrasting the actual length of side of E words using identity card developed width, E word actual ratios are obtained, i.e.,：Identity is confirmed
The actual length of side of border width (85.6mm)/E words=E word actual ratios.
Step 4: using identity card respective pixel width versus E word actual ratios, obtaining E word length of side pixels, i.e.,：Identity
Demonstrate,prove respective pixel width (for example：380px)/E words actual ratio=E word length of sides pixel is (for example：16.14px).
Step 5: E words polar plot (square) drawn in system is carried out into pixel length of side limitation.
Step 6: E word images are presented.
The present invention is doing in kind with reference in the case of with identity card, can get the screen pixels of the equal size of identity card
Area, and using the pattern drawing method of computer, identity card natural scale is contrasted, to obtain correspondence ratio, then by entity lamp box
Standard E words size (how many centimetres) compared with correspondence ratio so that computer is drawn and entity lamp in the form of pixel
The equal-sized figure of case standard E words (with the E words of pixel point-rendering correspondence centimetre size), it is advantageous in that, can be in difference point
The E of equal size is shown on the screen (different screen resolutions is related to pixel quantity in unit pixel point area) of resolution
Word.
Based on the normalized form of national UCVA table, computer picture is calculated, and drawn out equivalent with reality
The E word UCVA tables of size, user also can directly adjust measuring distance in software, and E word UCVAs table can be according to being adjusted
Whole distance carries out repainting for image, facilitates eyesight to detect front line staff because place reason need to carry multiple criterion distances
UCVA table, and reduce the loss in terms of material.
It is somebody's turn to do above, is only presently preferred embodiments of the present invention, any formal limitation not is made to the present invention, although
The present invention is disclosed as above with preferred embodiment, but is not limited to the present invention, and any those skilled in the art are not taking off
In the range of technical solution of the present invention, when the technology contents using the disclosure above make a little change or are modified to equivalent variations
Equivalent embodiment, as long as being that without departing from technical solution of the present invention content, the technical spirit according to the present invention is to above example
Any brief introduction modification, equivalent variations and the modification made, in the range of still falling within technical solution of the present invention.
Claims (4)
1. a kind of drafting standard UCVA table E method, it is characterised in that：Comprise the following steps：
Step 1: by the display of a computer for being provided with vision drop software, obtaining reference standard card on display
Shared pixel number evidence；
The actual length of side of visual chart E words is obtained Step 2: calculating；
Step 3: contrasting the actual length of side of E words using identity card developed width, E word actual ratios are obtained；
Step 4: using identity card respective pixel width versus E word actual ratios, obtaining E word length of side pixels；
Step 5: E words polar plot (square) drawn in system is carried out into pixel length of side limitation；
Step 6: E word images are presented.
2. standard UCVA table E method is drawn as claimed in claim 1, it is characterised in that：In step one, with second generation body
Part card is being provided with opening vision drop software on the computer of vision drop software, is setting resolution ratio as reference standard card,
Second generation identity card is placed on the indicator screen of computer, identity card is obtained in the size on indicator screen.
3. standard UCVA table E method is drawn as claimed in claim 2, it is characterised in that：In step 2, according to following public affairs
Formula, which is calculated, obtains the actual length of side of visual chart E words：
The actual length of side of E words=E interword gap values * 5；
Wherein, E interword gaps value=tan (the visual angle number of degrees) * measured distances；And the effective visual angles of the decimal of the visual angle number of degrees=1/ record *.
4. standard UCVA table E method is drawn as claimed in claim 3, it is characterised in that：In step 3, the actual ratio of E words
Value=identity card developed width/actual the length of side of E words.
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| CN201710406499.XA CN107170028A (en) | 2017-06-02 | 2017-06-02 | A kind of drafting standard UCVA table E method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179869A (en) * | 2020-01-21 | 2020-05-19 | 纳晶科技股份有限公司 | E visual target definition adjusting method and display |
| CN111367484A (en) * | 2020-03-06 | 2020-07-03 | 深圳全息信息科技发展有限公司 | Method, system and storage medium for performing eyesight test on terminal screen |
| CN111643047A (en) * | 2020-06-19 | 2020-09-11 | 徐州市康复医院(徐州市老年病医院) | Self-service ophthalmology eyesight detection device |
| CN112450871A (en) * | 2020-11-19 | 2021-03-09 | 温州星康医学科技有限公司 | Vision detection system and method adaptive to different resolutions |
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| CN105147236A (en) * | 2015-06-16 | 2015-12-16 | 杭州来同科技有限公司 | Visual test device |
| CN105942965A (en) * | 2016-06-13 | 2016-09-21 | 东南大学 | Subjective vision self-testing device based on intelligent terminal |
| CN106203370A (en) * | 2016-07-19 | 2016-12-07 | 成都通甲优博科技有限责任公司 | A kind of test near and distance method and system based on computer vision technique |
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| CN104639643A (en) * | 2015-02-11 | 2015-05-20 | 北京市眼科研究所 | Comprehensive vision self-service detection method based on Internet video terminal |
| CN105147236A (en) * | 2015-06-16 | 2015-12-16 | 杭州来同科技有限公司 | Visual test device |
| CN105942965A (en) * | 2016-06-13 | 2016-09-21 | 东南大学 | Subjective vision self-testing device based on intelligent terminal |
| CN106203370A (en) * | 2016-07-19 | 2016-12-07 | 成都通甲优博科技有限责任公司 | A kind of test near and distance method and system based on computer vision technique |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179869A (en) * | 2020-01-21 | 2020-05-19 | 纳晶科技股份有限公司 | E visual target definition adjusting method and display |
| CN111179869B (en) * | 2020-01-21 | 2021-12-14 | 纳晶科技股份有限公司 | E visual target definition adjusting method and display |
| CN111367484A (en) * | 2020-03-06 | 2020-07-03 | 深圳全息信息科技发展有限公司 | Method, system and storage medium for performing eyesight test on terminal screen |
| CN111643047A (en) * | 2020-06-19 | 2020-09-11 | 徐州市康复医院(徐州市老年病医院) | Self-service ophthalmology eyesight detection device |
| CN112450871A (en) * | 2020-11-19 | 2021-03-09 | 温州星康医学科技有限公司 | Vision detection system and method adaptive to different resolutions |
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Application publication date: 20170915 |