CN207622867U - A kind of projector brightness on-line detecting system - Google Patents
A kind of projector brightness on-line detecting system Download PDFInfo
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- CN207622867U CN207622867U CN201721843076.6U CN201721843076U CN207622867U CN 207622867 U CN207622867 U CN 207622867U CN 201721843076 U CN201721843076 U CN 201721843076U CN 207622867 U CN207622867 U CN 207622867U
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Abstract
The utility model discloses a kind of projector brightness on-line detecting systems, including projection screen, to provide projection plane for projecting apparatus；Image Acquisition end is set to the top of projecting apparatus；The image of projection plane when described image collection terminal is to acquire and handle the projecting apparatus use；Central controller to control projecting apparatus and Image Acquisition end, and reads described image from described image collection terminal；Management terminal is connected to the central controller, to obtain, store and analyze described image.The projector brightness on-line detecting system of the utility model, the effective management and maintenance for realizing high-volume multi-media classroom projector, the behaviour in service of projector can not only be understood in time using this detecting system, it is equipped with and carries out convenient for spare part, it can also be repaired for sex chromosome mosaicism, and avoid manual inspection and judge that the heavy workload brought, parameter judge the problems such as inaccurate, substantially increase the initiative of management service.
Description
Technical field
The utility model is related to the fields such as brightness monitoring technical field, specially a kind of projector brightness on-line checking system
System.
Background technology
Under Information Condition, multi-media classroom has become the important place that universities and colleges carry out multimedia teaching and the Web-based instruction,
The important process that maintenance and management also has become daily teaching guarantee is carried out to its equipment.Master of the projector as multi-media classroom
Component devices are wanted, the emphasis of maintenance is light bulb, when bulb brightness drops to certain value, need to just clean projector or replace lamp
Bubble.Currently, bulb brightness is adopted generally by being manually detected and judging, but since universities and colleges' multi-media classroom quantity is more, distribution is wide
It is manually detected, carrying out booting one by one to each classroom checks that not only time-consuming and laborious, efficiency is low, and low precision.Projection
Machine brightness refers to the luminous flux of projector's output, it is the energy for describing the radiation of unit interval inner light source and generating eye response power
Power, SI units are ANSI lumens, are usually indicated with Φ.In engineering practice, usually obtained with the method for measuring illumination
The brightness of projector.Standard test environment is：Under no environment light condition, distance is 2.4 meters between projector and curtain, curtain
It is 60 inches, measures each point illumination on nine crosspoints of curtain sphere of movements for the elephants shape with photometric pen, be multiplied by area and obtain projected picture
Nine points brightness, the average value for then finding out nine brightness is exactly ANSI lumen brightness.Since the scene of nine points is true
Recognize and bother very much, is difficult to promote and apply in the environment of no special test equipment.The nominal luminance of projector is its Theoretical Design
Value, it is the important parameter for selecting projector.In actual use, due to by ambient light, curtain size, curtain gain, curtain
The influence of many factors such as distance, the brightness on projector to screen can change.In teaching, teachers and students' more attention
It is the brightness on projector to screen, this brightness is called the use brightness of projector, routine use maintenance and management
In described projector's brightness refer to just that it uses brightness.After classroom furniture installation determines, when using brightness with using
Between increase and continuously decrease.Projector can be carried out using brightness measurement with illumination photometer, and in classroom, projector, curtain installation determine
Afterwards, it influences using the factor of brightness to be mainly ambient light.When practical measurement, in order to eliminate the influence of ambient light, one may be used
Kind simple measurement method that is, by measurement illumination, then is scaled brightness.Φ=ES, E are illumination, and S is curtain area.It measures
Method：1) open projector and preheat 5 minutes or more；2) that black is launched on projection screen using Word or PowerPoint is white
Image；3) brightness value Ew is measured with the part of illumination photometer white in the picture (practical is bright), black in the picture (practical is dark)
Measure brightness value Eb in part；4) its area S is calculated according to the size of projection screen；5) relational expression Φ=(Ew-Eb) S is utilized
Calculate the actual use brightness of projector.Though this method can approximate measure projector use brightness, illumination photometer it is photosensitive
Device need on the screen be positioned by manually, just seem very troublesome to high-volume classroom, not only heavy workload, but also efficiency is low.
Utility model content
The purpose of this utility model is：A kind of projector brightness on-line detecting system is provided, is thrown with solving existing high-volume
Shadow instrument brightness difficult management, the problem under efficiency.
Realizing the technical solution of above-mentioned purpose is：A kind of projector brightness on-line detecting system, including projection screen, to for
Projecting apparatus provides projection plane；Image Acquisition end is set to the top of projecting apparatus；Described image collection terminal is acquiring and handle institute
The image of projection plane when projecting apparatus uses is stated, which includes the image that projecting apparatus is under white screen and black state, and
Calculate the brightness of image；Central controller to control projecting apparatus and Image Acquisition end, and is read from described image collection terminal
Described image；Management terminal is connected to the central controller, to obtain, store and analyze described image.
In one preferred embodiment of the utility model, described image collection terminal includes high-definition camera, to acquire figure
Picture；The optical signal to obtain the optical signal that projecting apparatus is under white screen and black state, and is converted to electricity by photoelectric sensor
Flow signal；Collection terminal processor, to calculate R, G, B value of described image；And electric current is obtained according to optical signal and electric signal
The functional relation of the brightness of signal and light.
In one preferred embodiment of the utility model, the high-definition camera is CCD/CMOS cameras.
The utility model has the advantages that：The projector brightness on-line detecting system of the utility model effectively realizes big
The management and maintenance of batch multi-media classroom projector can not only understand the use shape of projector using this detecting system in time
Condition is equipped with and is carried out convenient for spare part, moreover it is possible to be repaired for sex chromosome mosaicism, and avoid manual inspection and judge the work brought
Amount is big, parameter judges the problems such as inaccurate, substantially increases the initiative of management service.
Description of the drawings
The utility model is further explained with reference to the accompanying drawings and examples.
Fig. 1 is the projector brightness on-line detecting system structure chart of the utility model embodiment.
Wherein,
1 projection screen；2 Image Acquisition ends；
3 central controllers；4 management terminals；
21 high-definition cameras；22 photoelectric sensors；
23 collection terminal processors；5 projecting apparatus.
Specific implementation mode
The explanation of following embodiment is to refer to additional schema, to illustrate the specific reality that the utility model can be used to implement
Apply example.The direction term that the utility model is previously mentioned, such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom"
Deng being only the direction with reference to annexed drawings.Therefore, the direction term used be illustrate and understand the utility model, rather than
To limit the utility model.
Embodiment：As shown in Figure 1, a kind of projector brightness on-line detecting system, including projection screen 1, Image Acquisition end 2,
Central controller 3, management terminal 4.
Projection screen 1 for projecting apparatus 5 providing projection plane.
Image Acquisition end 2 is set to the top of projecting apparatus 5；Described image collection terminal 2 is acquiring and handle the projecting apparatus 5
The image of projection plane when use, the image include the image that projecting apparatus 5 is under white screen and black state, and calculate image
Brightness.Described image collection terminal 2 includes high-definition camera 21, photoelectric sensor 22, collection terminal processor 23.High-definition camera
21 to acquire image, and in the present embodiment, the high-definition camera 21 is CCD/CMOS cameras.Photoelectric sensor 22 is obtaining
It takes projecting apparatus 5 to be in the optical signal under white screen and black state, and the optical signal is converted into current signal；Collection terminal processor
23, to calculate R, G, B value of described image；And the letter of the brightness of current signal and light is obtained according to optical signal and electric signal
Number relationship.
Central controller 3 is read from described image collection terminal 2 described to control projecting apparatus 5 and Image Acquisition end 2
Image.
Management terminal 4 is connected to the central controller, and management terminal 4 is obtaining, store and analyze described image.
When specifically used, on the basis of existing multi-media classroom, increase Image Acquisition end 2, control and management software, just
It can realize the on-line automatic measurement and display of projector's brightness.Image Acquisition end 2 is powered and is controlled to it by central controller 3,
It is responsible for Image Acquisition and brightness calculation.Control software is solidificated in central controller 3, is responsible for handling projecting apparatus 5 and collection terminal
Device 23 is controlled, while transmitting data to management terminal 4 by network communication protocol.Management software is mounted on management terminal 4
On, mainly data are stored and analyzed using database.When central controller 3 receives the instruction shut down to projector
When, central controller 3 successively controls projector and is in white screen and black state, while image acquisition and processing device carries out white screen and blank screen
Then the capture of image acquires R, G, B value of image slices vegetarian refreshments and carries out brightness calculation, it is bright to be converted to projector by algorithm
Degree passes to management terminal 4 finally by network and carries out storage analysis and display.According to picture theory, the brightness of each pixel
Value Y can be used following formula to calculate：
Yi=0.299Ri+0.587Gi+0.114Bi
(1) if the pixel number of unit area is M, the brightness of unit area image is：Ys=(Y1+Y2+...+YM)/
M。
(2) it in order to eliminate influence of the factors such as ambient light to brightness, needs using acquiring mensuration twice.That is control projection
Machine launches completely white or black, acquires two images respectively, calculates the brightness YWS and YBS of two images unit area, then calculates
The two difference DELTA YS.Due to the luminance difference very little of each pixel of image when screen is complete white or completely black, M values are desirable to be corresponded to
Pixel number in the area of screen 1/100.Yws=(Y1w+Y2w+...+YMw)/M YBs=(Y1B+Y2B
+ ... YMB)/M Δs YS=YWS-YBS.
(3) Δ YS is that the projector measured uses brightness, Δ YS gradually to decline with the increase of projector usage time t
Subtract, is represented by the function of time：Δ YS=f1 (t).
(4) equally, the illumination at corresponding screen unit area can be measured with illumination photometer, projector launch it is complete white and
When completely black, the illumination Ew and EB at corresponding curtain center are measured respectively, it is poor to calculate illumination：Δ E=Ew-EB.
(5) Δ E is to use brightness with the projector that illumination photometer measures, and is also referred to as the function of time, i.e.,：ΔE
=f2 (t).
(6) principle is obtained according to image, is that luminous energy is changed by electric current by optical sensor (CCD/CMOS cameras)
It is obtained after being handled again, the brightness of photoelectric current and light is linear.And illumination photometer is to be turned luminous energy by silicon photocell
Change electric energy into, photoelectric current and illumination are also linear.Two kinds of photoelectric sensors 22, one is reflected light is received, one is connect
Irradiation light is received, but its principle is essentially identical, to the light-receiving surface of same area, the brightness for the light that above two method obtains is at certain
Proportionate relationship.
The relationship of unit area brightness of image Δ YS and illumination Δ E in order to obtain, then divided using correlation test method
Analysis.Tracking test is carried out to newly-built multi-media classroom, each classroom is assembled with image acquisition and processing device and corresponding middle control,
Brightness automatic measurements Δ YS is used by 4 acquired projections machine of management terminal, while periodically measuring projector with illumination photometer and using
Brightness hand dipping value Δ E.By statistic record more than a year, a large amount of data are obtained, are found by correlation statistical analysis：When
Projector uses after a certain period of time, and brightness linearly declines, and before this, brightness slowly declines at any time；Exist simultaneously
Projector, curtain and environmental condition it is identical in the case of, f2 (t) relationships proportional to two curve approximations of f1 (t), i.e.,：K=f2
(t)/f1 (t)=Δ E/ Δs YS
(7) K is called brightness calibration coefficient, depend on the structural behaviour, curtain characteristic, curtain of projector and light bulb away from
From factors such as the, performances of illumination photometer and image capture module, under conditions of above-mentioned factor determines, K values are approximately a constant.No
Same Multimedia Classrooms should individually carry out calibrated and calculated.Brightness of image can be scaled illumination according to K values.Lead in engineering
It crosses following methods and calculates K values：After the new projector of certain multi-media classroom and curtain mounting and adjusting are good, it is directed at curtain center, uses illumination
Meter measures illumination when projector's completely white or black respectively, calculates illumination difference Δ E, in manual typing management software, by system root
The Δ YS calculated according to image acquisition and processing device obtains calibration coefficient K, then uses t moment, the actual use brightness of projector can
With following formula approximate calculation：
Δ E (t)=K Δ YS (t)
(8) Δ E (t) is the illumination at screen center, if be multiplied by screen area (square metre) can approximation obtain projector
Luminous flux, i.e. ANSI lumens brightness.
Only image Acquisition Processor and corresponding software need to be installed in multi-media classroom, so that it may on-line automatic measurement projector
Use brightness, stored data in server by network central control.In routine use, each projector is shut down using end
When, brightness measurement and storage can be all carried out automatically, and administrative staff can be become by the brightness of network terminal statistical analysis projector at any time
Change situation.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality
All any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle
Within the scope of shield.
Claims (3)
1. a kind of projector brightness on-line detecting system, which is characterized in that including
Projection screen, to provide projection plane for projecting apparatus；
Image Acquisition end is set to the top of projecting apparatus；When described image collection terminal uses to acquire and handle the projecting apparatus
The image of projection plane, the image include the image that projecting apparatus is under white screen and black state, and calculate the brightness of image；
Central controller to control projecting apparatus and Image Acquisition end, and reads described image from described image collection terminal；
Management terminal is connected to the central controller, to obtain, store and analyze described image.
2. projector brightness on-line detecting system according to claim 1, which is characterized in that described image collection terminal includes
High-definition camera, to acquire image；
Photoelectric sensor to obtain the optical signal that projecting apparatus is under white screen and black state, and the optical signal is converted to
Current signal；
Collection terminal processor, to calculate R, G, B value of described image；And current signal is obtained according to optical signal and electric signal
With the functional relation of the brightness of light.
3. projector brightness on-line detecting system according to claim 2, which is characterized in that the high-definition camera is
CCD/CMOS cameras.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721843076.6U CN207622867U (en) | 2017-12-25 | 2017-12-25 | A kind of projector brightness on-line detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721843076.6U CN207622867U (en) | 2017-12-25 | 2017-12-25 | A kind of projector brightness on-line detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990980A (en) * | 2017-12-25 | 2018-05-04 | 深圳深索智能科技有限公司 | A kind of projector brightness on-line detecting system |
| CN110769232A (en) * | 2019-08-12 | 2020-02-07 | 成都极米科技股份有限公司 | Brightness detection method, device and system of ultra-short focus projector |
| CN111854935A (en) * | 2020-09-24 | 2020-10-30 | 歌尔股份有限公司 | Projection system illumination measuring method, apparatus and readable storage medium |
-
2017
- 2017-12-25 CN CN201721843076.6U patent/CN207622867U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990980A (en) * | 2017-12-25 | 2018-05-04 | 深圳深索智能科技有限公司 | A kind of projector brightness on-line detecting system |
| CN110769232A (en) * | 2019-08-12 | 2020-02-07 | 成都极米科技股份有限公司 | Brightness detection method, device and system of ultra-short focus projector |
| CN110769232B (en) * | 2019-08-12 | 2021-09-28 | 成都极米科技股份有限公司 | Brightness detection method, device and system of ultra-short focus projector |
| CN111854935A (en) * | 2020-09-24 | 2020-10-30 | 歌尔股份有限公司 | Projection system illumination measuring method, apparatus and readable storage medium |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20180717 Termination date: 20201225 |