CN104219517A

CN104219517A - A testing method for 3D-based one-piece camera

Info

Publication number: CN104219517A
Application number: CN201310216188.9A
Authority: CN
Inventors: 施剑平
Original assignee: SHANGHAI MEDIA GROUP Inc
Current assignee: SHANGHAI MEDIA GROUP Inc
Priority date: 2013-05-31
Filing date: 2013-05-31
Publication date: 2014-12-17

Abstract

The invention of the present testing method mainly relates to a testing method for a 3D one-piece camera, which evaluates major performance features of the 3D one-piece camera through testing parameters of the camera. The parameters for the test mainly are: sensitivity, Signal to Noise Ratio, minimum illumination, modulation depth, dynamic range, left and right eyes camera lens perpendicularity/horizontality, left and right eyes camera lens optical property, etc.

Description

A kind of method of testing based on 3D integral type video camera

Technical field

The present invention relates generally to a kind of method of testing based on 3D integral type video camera.Belong to broadcasting and TV field.

Background technology

A research report according to the Display Search of market research agency issue claims, under the actuating of 3D film, 3D market started to take off in 2010 years.And along with global consumer electronics manufacturer is released successively and a collection ofly comprised that the 3D Related products such as television set, monitor, notebook computer, blu-ray player, digital camera, video camera, digital photo frame march family market, add the professional application such as original advertisement, public display board and medical treatment, 3D is promoting a technological revolution that turns to stereo display from flat panel display.Over nearly 5 years, rapidly, aspect display terminal, active-shutter and polarization-type three-dimensional television set come into the market the development of 3D TV tech in a large number especially, have at present nearly 200 sections of 3D TVs of domestic and international tens brands to sell on market.

Certainly, revolutionary new technology, when improving human life quality, often also can produce huge application market.For television industries, according to the up-to-date prediction of Display Search, to market penetration rate in 2014, have an opportunity to reach 37%, global 3D TV shipment amount is estimated over 9,000 ten thousand when the time comes.When the time comes, 3D TV will become the revenue source of field of household appliances maximum, estimates that annual turnover will reach 17,000,000,000 dollars.

Along with 3D film < < A Fan reaches > > in global hot showing, consumer starts in the world one to the fanaticism of 3D and takes turns 3D upsurge.The U.S., Japan, the numerous and confused investment that strengthens 3D industry in Europe, some countries 3D channel that started broadcasting.Britain sky TV station formally opens and broadcasts after SKY3D television channel and U.S. ESPN3D channel completed 25 football matches of live South Africa world cup, the Japan perfect Satellite Communications Company of sky (SKY Perfect JSAT) jointly Sony releases a special world cup 3D channel " Sukachan 3D 169 " in its satellite HDTV (High-Definition Television), for Nippon Television family provides South Africa World Cup 3D live telecast.Britain BBC has also completed the relay of many 3D races again in the 2012 London Olympic Games.

In China, the Chinese 3D TV of being taken the lead by the general bureau channel of piloting is formally piloted on January 1st, 2012.

At present, 3D TV is as a new broadcasting and TV technology, each TV station and manufacturing company are for the understanding of 3D technology and grasp deep mixed, due to 3D TV and traditional HDTV (High-Definition Television) distinct, the problem that particularly safe mass is controlled, therefore the test for the video camera foremost of 3D TV tech seems particularly important.

Summary of the invention

For solving the technical indicator test problem of 3D video camera, the invention provides a kind of method for each technical indicator test of 3D video camera.

1, set 3D video camera test major parameter:

1) sensitivity

2) signal to noise ratio

3) minimal illumination

4) modulation depth

5) dynamic range

2,3D camcorder technology index test scheme:

1) use equipment:

(1) test graph card---grey level histogram, multiburst card

(2) optics instrument---illuminance meter, colour temperature meter

(3) tester---accurate colour picture monitor, VM700, LV5800

2) site layout project

Accompanying drawing 1

3) test condition

While taking various test card, should get its standard picture dimension, even its orientation triangle is aimed at the border of monitor picture.Camera optical axis should be vertical with test card, and error is no more than ± and 5 °.

Camcorder apparatus operating state table

State is set	Colour filter	Gain selection	γ switch	DTL switch	Chroma switch
						State I	3200K	0db	ON(0.45)	ON	-----
State II	3200K	Maximum	ON(0.45)	ON	-----
						State III	3200K	0db	OFF(1)	OFF	OFF

Accompanying drawing explanation

Accompanying drawing 1 test site layout plan

Embodiment

1) sensitivity

Definition: be 2000 ± 20lx in illumination, under the lighting condition of colour temperature 3100 ± 100K, take reflectivity when camera gain is 0dB and be 89.9% grey level histogram.When video level reaches 0.7V (100%), F-number is defined as sensitivity, with " F number ", represents.

Method: camcorder apparatus is set as operating state I, takes grey level histogram, then adjusts aperture after mixing up white balance, makes it to read the signal level value of regulation on waveform monitor.Then, record " the F number " of following 2 kinds of situations:

When A. shutter is put OFF, acquired results is sensitivity measure value.

When B. shutter is put 1/125 second, acquired results is in order to check shutter characteristic.

2) signal to noise ratio

Definition: the unweighted signal-to-noise ratio S/N with luminance channel standard gain represents.

Method: camcorder apparatus is set as operating state III, first takes grey level histogram, mixes up black and white balance, then adjusts aperture luminance signal amplitude is adjusted to 100%.Then cover lens cap and cut off light path.On waveform monitor, confirm that black level is 5%.With VM700, measuring respectively gain is the signal to noise ratio of 0dB, 9dB, 18dB, and record.

3) minimal illumination

Definition: video camera is put gain for maximum (but must guarantee that the image of shooting is continuous), maximum ring, the grey level histogram that picked-up reflectivity is 89.9%, the illumination needing while making video level reach 100% (0.7V) is minimal illumination.

Method: camera setting is operating state II, and lens aperture is opened to maximum.First, with low-light (level) picked-up grey level histogram, then slowly increase illumination.On waveform monitor, signal level arrives after setting, measures the now illumination of grey level histogram, and writes down maximum ring number.

4) modulation depth

Definition: the modulation degree of 0.5MHz of take is 100%, and the modulation degree that reads 5MHz represents.The modulation degree that separately reads 6MHz is for referencial use.

Method: camera setting is operating state III, lens aperture is approximately placed between 5.6 and 8.0, takes multiburst card.Camera lens is transferred to best focus.On waveform monitor, choose the several rows that separate, read the modulation degree of 5MHz and the modulation degree of 6MHz, and average respectively.

5) dynamic range

Definition: being provided with dynamic contrast control (flex point is controlled automatically) circuit (being called for short DCC) in ccd video camera can be by dynamic range expansion to 600%.But incident is possible cause that lotus bloomed phenomenon, and a two rank bright wisp for grey level histogram image cannot be distinguished, and therefore the observation of this kind of phenomenon be can be used to judge the quality of 600% dynamic range.

Method: video camera is set to state I, lens aperture is placed in 5.6 grades, takes grey level histogram.Adjust illumination, white level reaches standard value (0.7V), shows correct grey level histogram image on picture monitor.Then increase aperture two and half (put aperture scale between 2.8 and 2.0, approximately increase light-inletting quantity to 600%), and DCC switch is put to ON.Now at picture monitor, still can distinguish two the brightest rank bright wisps and illustrate that dynamic range is enough.Otherwise stop down is write down F-number now till extremely distinguishing this two bright wisp, calculates actual dynamic range.

Claims

1. the method for testing based on 3D integral type video camera, it is characterized in that, this method of testing is different from the method for testing of traditional single-lens 2D video camera, there is uniqueness, from the putting position of video camera, the adjustment parameter of video camera (convergence plane, positive negative parallax) etc., and the requirement of video camera shot object to light.The comparative parameter of test is: sensitivity, signal to noise ratio, minimal illumination, modulation depth, dynamic range, right and left eyes camera lens vertical/horizontal, right and left eyes lens optical characteristic etc.

2. the test comparative approach based on 3D integral type video camera:

1) sensitivity: camcorder apparatus is set as operating state I, takes grey level histogram, then adjusts aperture after mixing up white balance, makes it to read the signal level value of regulation on waveform monitor.Then, record " the F number " of following 2 kinds of situations;

2) signal to noise ratio: camcorder apparatus is set as operating state III, first takes grey level histogram, mixes up black and white balance, then adjusts aperture luminance signal amplitude is adjusted to 100%.Then cover lens cap and cut off light path.On waveform monitor, confirm that black level is 5%.With VM700, measuring respectively gain is the signal to noise ratio of 0dB, 9dB, 18dB, and record;

3) minimal illumination: camera setting is operating state II, and lens aperture is opened to maximum.First, with low-light (level) picked-up grey level histogram, then slowly increase illumination.On waveform monitor, signal level arrives after setting, measures the now illumination of grey level histogram, and writes down maximum ring number;

4) modulation depth: camera setting is operating state III, lens aperture is approximately placed between 5.6 and 8.0, takes multiburst card.Camera lens is transferred to best focus.On waveform monitor, choose the several rows that separate, read the modulation degree of 5MHz and the modulation degree of 6MHz, and average respectively;

5) dynamic range: video camera is set to state I, lens aperture is placed in 5.6 grades, takes grey level histogram.Adjust illumination, white level reaches standard value (0.7V), shows correct grey level histogram image on picture monitor.Then increase aperture two and half (put aperture scale between 2.8 and 2.0, approximately increase light-inletting quantity to 600%), and DCC switch is put to ON.Now at picture monitor, still can distinguish two the brightest rank bright wisps and illustrate that dynamic range is enough.Otherwise stop down is write down F-number now till extremely distinguishing this two bright wisp, calculates actual dynamic range.