CN203708393U - LED light source light box used for testing dynamic range of camera - Google Patents
LED light source light box used for testing dynamic range of camera Download PDFInfo
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- CN203708393U CN203708393U CN201320604020.0U CN201320604020U CN203708393U CN 203708393 U CN203708393 U CN 203708393U CN 201320604020 U CN201320604020 U CN 201320604020U CN 203708393 U CN203708393 U CN 203708393U
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Abstract
The utility model provides an LED light source light box used for testing the dynamic range of a camera, and belongs to the field of testing. The LED light source light box is provided with a closed testing space, an LED light source is arranged in the closed testing space, the front end of the closed testing space is provided with a front panel with a camera testing hole, a transparent testing card is arranged between the LED light source and the front panel, a mobile slide rail is arranged along the direction of the longitudinal axis of the testing space, the LED light source is arranged on a mobile slide block of the mobile slide rail, and a control terminal of the LED light source, a control terminal of the mobile slide rail, and an image output terminal of a to-be-tested camera lens are respectively and correspondingly connected with an I/O port which controls a computer. According to the LED light source light box, a closed testing environment, separated from the outside, for the light source is provided, the power consumption of the light source is small, the consistency of optical parameters such as the chroma, the brightness etc. is good, and the setting and adjustment of the optical parameters of an LED light source assembly are controlled by the computer so that the operation of the whole testing equipment is convenient, the measuring precision is greatly improved, and tested results are more objective.
Description
Technical field
The utility model belongs to optic test field, relates in particular to a kind of for measuring the testing apparatus of video camera imaging device dynamic range.
Background technology
When the lower regions of relative brightness such as the high-brightness region under irradiating in intense light source (daylight, light fixture or reflective etc.) and shade, backlight exist in image simultaneously, the image of video camera output there will be bright areas because of the over-exposed white that becomes, and dark area is because under-exposure becomes black, have a strong impact on picture quality.
Video camera in Same Scene to brightest area and compared with the performance of dark areas be exist limitation, this limitation is exactly common said " dynamic range ".
Visible, " dynamic range " of video camera refers to that video camera shines the adaptive capacity of reflection to scene light in photographed scene, specifically refer to the excursion of brightness (contrast) and colour temperature (contrast), representing " secretly " of video camera to image and the adjusting range of " bright ", is the ratio of light tone and low key tone in still image or frame of video.
At present, the method for determining video camera imaging device " dynamic range " mainly contains two kinds: a kind of is to use the associated information calculation of basic circuit in transducer and image processor to draw; Another kind is to collect and observe image with GTG test card and dynamic light source, and measures dynamic range rank.
Although adopt the method for calculating can calculate in theory the limiting value of dynamic range, be conventionally more inclined to use the method that dynamic light source is measured in reality test, because it can reflect the real experiences of user to video camera imaging effect.
The conventional method of existing test video camera " dynamic range " is in flat surface, 2 cover test cards to be installed in (in the industry darkroom being defined as: the ambient light illumination/brightness of test is less than 1lx (Luxes, lux, unit of illuminance)) in darkroom; Wherein 1 cover is transmission-type test card, adopts the adjustable back light of brightness as constant reference, adjusts the brightness of backlight, guarantees that the illumination of dispersing on light source surface is set point (for example: 2500Lux); Other 1 cover is reflective test card, adopts and is positioned at radiation source its front, that brightness is adjustable, for measuring the critical value of dynamic range; Determined position for video camera is in the dead ahead of 2 cover test cards.
There is following problem in this method of testing:
1, whole test environment must carry out in darkroom;
2, each light source parameters setting and light source position employing manual mode is set, the consistency of measuring accuracy and test result can not well be guaranteed;
3, existing light source adopts powerful incandescent lamp or other light fixtures conventionally, and light source power consumption is large, poor reliability, and the optical parametric such as colourity, the brightness consistency of light source is poor;
4, for the back projection light source of transmission test card and between the radiation source of reflection measurement card because not isolation is crosstalked mutually, affect measuring accuracy; If increase substantially the brightness output of back projection light source and radiation source, between this two light sources mutually crosstalk can be more serious.
Utility model content
Technical problem to be solved in the utility model is to provide that a kind of it adopts independently airtight case structure for testing the LED light source lamp box of video camera dynamic range, and the airtight testing light source environment being isolated from the outside is provided, and has ensured the objectivity of test result; Adopt LED light source, light source power consumption is little, good reliability, the optical parametric high conformities such as its colourity, brightness; Whole testing equipment is easy to operate, and certainty of measurement improves greatly, and test result is more objective.
The technical solution of the utility model is: provide a kind of and comprise light source and test card for testing the LED light source lamp box of video camera dynamic range, it is characterized in that: an airtight test space is set; In airtight case structure, be divided into two adjacent, separate first test space and second test spaces through longitudinal separation plate; In the first/the second test space, correspondence arranges the first LED light source and the second LED light source respectively; Between the tested picture pick-up device camera lens and LED light source exiting surface of first test space, correspondence is placed with the first transmission test card holder; In the first transmission test card holder, be provided with the first transmission test card; Between the tested picture pick-up device camera lens and LED light source exiting surface of second test space, correspondence is placed with the second transmission test card holder; In the second transmission test card holder, be provided with the second transmission test card; Lay respectively at the first LED light source and the second LED light source in the first/the second test space, be arranged on the first/the second moving slider by correspondence respectively; The the first/the second described LED light source, under the drive of described the first/the second electric moveable slide block, moves along the longitudinal direction of described the first/the second test space; At the front end of the described airtight test space, be provided with the front panel of the first video camera instrument connection and the second video camera instrument connection; The longitudinal axis of its first or second test space, overlaps with the exiting surface of the first or second LED light source and the normal of the transparent test card plane of delineation respectively.
Concrete, the first/the second described LED light source comprises at least respectively a backlight type LED light emitting source assembly and corresponding power subsystem and LED light source emitting brightness control unit thereof.
On described front panel, be also provided with the 3rd video camera instrument connection; The center line of its 3rd video camera instrument connection overlaps with the longitudinal axis of the longitudinal separation plate between described first and second test spaces.
The center line of the first/the second video camera instrument connection described in it, corresponding with the longitudinal axis of the first/the second test space parallel or overlap respectively.
Moving slider described in it comprises the electric drive worm and wormwheel moving guide rail assembly with moving slider; Be positioned at the LED light source on described moving slider, under the driving of electric drive worm and wormwheel moving guide rail assembly, move along the longitudinal axis of the described test space.
Between described LED light source and front panel, be provided for placing the test card support of test card, transparent test card is set on test card support.
Described in it, the video camera instrument connection of front panel is flexible coupling through be flexible coupling shading sleeve and camera lens to be measured of elasticity.
Comprise transparent mode gradation test card in described transparent test card.
Compared with the prior art, the utility model has the advantages that:
1. adopt the test space of airtight case structure, closed testing light source environment with ambient light isolation is provided, whole testing equipment can be placed on general room, there is no the requirement of surround lighting, the defect of having avoided existing method of testing to carry out in darkroom, the objectivity that has ensured test result, has improved measuring accuracy;
2. adopt LED light source assembly, light source power consumption is little, good reliability, the optical parametric high conformities such as colourity, brightness, the consistency of test result and repeatable high;
3. adopt two adjacent, separate airtight light-source box system configurations, two groups of separate LED light sources are set simultaneously, make mutually not crosstalk between the bright dipping of two groups of LED light sources, improved measuring accuracy, mutually crosstalking between two groups of light sources avoiding.
Brief description of the drawings
Fig. 1 is the structural representation of the airtight case structure of the utility model;
Fig. 2 is the structural representation of the utility model embodiment;
Fig. 3 is that A-A ' of Fig. 2 is to cross sectional view;
Fig. 4 is the modular structure schematic diagram of the utility model electric-control system.
In figure, 1 is the airtight test space, 2 is LED light source, 2a is the first LED light source, 2b is the second LED light source, 3 is front panel, 4 is video camera instrument connection, 4-1～4-3 is the first to the 3rd video camera instrument connection, 5 is the pick-up lens of video camera to be measured, 6 is transparent test card, 6-1 is the first transparent test card, 6-2 is the second transparent test card, 7-1 is moving slider, 7-1a is the first moving slider, 7-1b is the second moving slider, 7-2 is electric drive worm and wormwheel moving guide rail assembly, 7-2a is the first electric drive worm and wormwheel moving guide rail assembly, 7-2b is the second electric drive worm and wormwheel moving guide rail assembly, 8 is test card support, 8-1 is the first test card support, 8-2 is the second test card support, 9 is the exiting surface of LED light source, 10 is longitudinal separation plate, 11 is first test space, 12 is second test space, 13 is a LED light emitting source assembly, 14 is the 2nd LED light emitting source assembly, 15 is the first LED light source emitting brightness control unit, 16 is the second LED light source emitting brightness control unit, 17～19 for being positioned at the output end of image of the first camera lens to be measured to the 3rd video camera instrument connection, PC is for controlling computer.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
In Fig. 1, the technical solution of the utility model provides a kind of and has comprised light source and test card for testing the LED light source lamp box of video camera dynamic range, and its technical scheme is: an airtight test space 1 is set; One LED light source 2 is set in the described airtight test space; At the front end of the described airtight test space, be provided with the front panel 3 of video camera instrument connection 4; On described video camera instrument connection, place the pick-up lens 5 of video camera to be measured; Between described LED light source and front panel, transparent test card 6 is set; Along the longitudinal axis of the described test space, a shifting sledge is set; LED light source described in it is arranged on the moving slider 7-1 of shifting sledge.
LED light source described in it at least comprises a backlight type LED light emitting source assembly and corresponding power subsystem and LED light source emitting brightness control unit thereof.
The center of described transparent test card image, with the optical axis coincidence of the pick-up lens of described video camera to be measured.
The longitudinal axis of the described test space, parallel with the longitudinal axis of the pick-up lens of LED light source exiting surface and video camera to be measured or overlap respectively, the longitudinal axis of the described test space and described transparent test card image place plane are perpendicular.
Described shifting sledge comprises the electric drive worm and wormwheel moving guide rail assembly 7-2 with moving slider 7-1; Be positioned at the LED light source 2 on described moving slider, under the driving of electric drive worm and wormwheel moving guide rail assembly, move along the longitudinal direction of the described test space.
Further, between described LED light source 2 and front panel 3, be provided for placing the test card support 8 of test card, transparent test card 6 is set on test card support.
As seen from the figure, the exiting surface 9 of its LED light source, is in fact equivalent to the pick-up lens of video camera to be measured with its corresponding transparent test card 6 and front panel 3() between, the structure setting being parallel to each other adopted.
The exiting surface 9 of its LED light source, arranges towards the front portion (i.e. below shown in figure) of the airtight test space.
The video camera instrument connection 4 of described front panel is flexible coupling through be flexible coupling shading sleeve (not marking in figure) and camera lens 5 to be measured of elasticity.
The technical program adopts the elasticity shading sleeve that is flexible coupling camera lens to be measured and video camera instrument connection to be flexibly connected to (or being called soft lucifuge fit structure), to ensure the shaded effect between camera lens and instrument connection, prevent that exterior light from producing light to the shooting results of tested camera lens and disturbing.
Described transparent test card comprises transparent mode gradation test card (also claiming GTG test pattern).
When actual test, can be according to the different needs of test event or tested video camera kind, the mode that employing is manually inserted or extracted packs or changes the transparent test card of variety classes/figure into, to meet the needs of different test events or customer requirement.
In Fig. 2, in airtight case structure 1, be divided into two adjacent, separate first test space 11 and second test spaces 12 through longitudinal separation plate 10.
Between the tested picture pick-up device camera lens and LED light source exiting surface of first test space, correspondence is placed with the first transmission test card holder 8-1; In the first transmission test card holder, be provided with the first transmission test card 6-1.
Between the tested picture pick-up device camera lens and LED light source exiting surface of second test space, correspondence is placed with the second transmission test card holder 8-2; In the second transmission test card holder, be provided with the second transmission test card 6-2.
Lay respectively at the first LED light source 2a and the second LED light source 2b in the first/the second test space, be arranged in the first/the second moving slider (not shown) by correspondence respectively; The the first/the second described LED light source, can, under the drive of described the first/the second electric drive worm and wormwheel moving guide rail assembly, move along the longitudinal direction of described the first/the second test space.
At the front end of the described airtight test space, be provided with the front panel 3 of the first video camera instrument connection 4-1 and the second video camera instrument connection 4-2.
Further, on front panel 3, be also provided with the 3rd video camera instrument connection 4-3; The center line of its 3rd video camera instrument connection overlaps with the longitudinal axis of the longitudinal separation plate between described first and second test spaces.
The longitudinal axis of its first or second test space, overlaps with the exiting surface of the first or second LED light source and the normal of the transparent test card plane of delineation respectively.
The center line of its first/the second video camera instrument connection, corresponding with the longitudinal axis of the first/the second test space parallel or overlap respectively.
Adopt the object of said structure, it is the picture centre in order to ensure test pattern (being aforesaid transparent test card), consistent with the optical axis of camera photography camera lens to be measured, and keep the plane of delineation of test pattern and the optical axis of camera photography camera lens to be measured perpendicular, this is the key point that adopts said structure pattern.
The output end of image of the control end of described LED light source, the control end of shifting sledge and camera lens to be measured, respectively with the corresponding connection of I/O port of controlling computer.
In Fig. 3, the airtight test space 1 is divided into two adjacent, independently first test space 11 and second test spaces 12 through a longitudinal separation plate 10.
In first test space, be provided with the first LED light source 2a, the first LED light source is arranged on the first moving slider 7-1a by correspondence; The first described LED light source, under the drive of the first electric drive worm and wormwheel moving guide rail assembly 7-2a, moves along the longitudinal direction of described first test space.
Similarly, in second test space 12, be provided with the second LED light source 2b, the second LED light source is arranged on the second moving slider 7-1b by correspondence; The second described LED light source, under the drive of the second electric drive worm and wormwheel moving guide rail assembly 7-2b, moves along the longitudinal direction of described second test space.
Preferably, the exiting surface area of its first LED light source is a times of described the second LED light source exiting surface area.
When actual enforcement, the illumination change scope of the first LED light source is 100～100000 luxs; The illumination change scope of described the second LED light source is 1～1000 lux, to meet the actual test needs of bright field, details in a play not acted out on stage, but told through dialogues.
Because the technical program adopts airtight case structure, whole testing equipment can be positioned over general room, there is no the requirement of surround lighting.
Because the first LED light source and the second LED light source are separately positioned in two adjacent spaces of airtight casing, completely independent between two groups of light sources, without any crosstalking, adopt 2 cover transmission-type test cards to insert respectively in the first/the second described test space simultaneously.
Two groups of light sources adopt LED luminescent device, and the power consumption of light source is little, good reliability, the optical parametric high conformities such as colourity, brightness.
Due to the light-source box system configuration of two independent closed of the technical program employing, the airtight testing light source environment being isolated from the outside is provided, ensure the objectivity of test result.
When actual test, tested picture pick-up device is placed on the table top of front panel relatively fixing, this device can provide altogether 3 test seats in the plane, be respectively used to test bright field, in details in a play not acted out on stage, but told through dialogues and bright details in a play not acted out on stage, but told through dialogues environment, the shooting results of tested camera lens to standard testing card graphic, passes judgment on or compares for follow-up test step.
Because LED light source can controlled movement in the Y direction of the airtight test space, can meet easily client's equipment under test different visual angles and change requirement, when actual enforcement, the exiting surface of LED light source can reach 1m to distance maximum between equipment under test camera lens, I is to 0.2m, and whole adjustable extent is 0.8m.
According to the relevant regulations of ISO12233 standard, " dynamic range " test of video camera is GTG test, it arranges requirement by test, to test pattern, Mx2.0 takes, photographic images is inputted in computer, in each grayscale bar, intercept area and be not less than 30% grey blocks, read the gray value of intercepted each grey blocks, if the difference of the gray value between two adjacent GTGs is more than or equal to 8, think that these two GTGs can differentiate, thereby can obtain from black to the progression of distinguishable, GTG in vain.
In the field tests of video camera, transmission-type test card is defined as can be by the transmission target throwing light on below, and reflective test card is defined as the test chart by the reflection of throwing light on above.
About the associated description of transmission test card, reflection measurement card, can be referring to the relevant narration in ISO12233 " measurement standard of digital camera ", above-mentioned transmission test card must meet the relevant regulations of ISO12233 test chart, no longer narrates at this.
In Fig. 4, its first/the second LED light source comprises at least respectively the first/the second backlight type LED light emitting source assembly 13 and 14, corresponding first/second source unit (not shown) and the first/the second LED light source emitting brightness control unit 15 and 16.
Concrete, the first/second source unit described in it is respectively through the first/the second LED light source emitting brightness control unit 13,14, with the first/the second backlight type LED light emitting source assembly 15/16 corresponding electrical connection; The control end of described the first/the second LED light source emitting brightness control unit, respectively with the corresponding electrical connection of I/O port of controlling computer PC.
The first/the second electric drive worm and wormwheel moving guide rail assembly 7-2a corresponding with the first/the second moving slider 7-1a and 7-1b difference and the control end of 7-2b, respectively with the corresponding connection of I/O port of controlling computer PC.
Be positioned at the output end of image of the camera lens to be measured 17～19 of the first to the 3rd video camera instrument connection, respectively with the corresponding connection of I/O port of controlling computer PC.
In the electric-control system of the technical program, electric drive worm and wormwheel moving guide rail assembly, according to the corresponding instruction of controlling computer, drives corresponding moving slider motion, and by the actual shift position of moving slider, feeds back to control computer.
The the first/the second described LED light source emitting brightness control unit, according to the corresponding instruction of controlling computer, controls respectively the luminosity/intensity of the first/the second LED light source.
The image signal output end of camera lens to be measured, by picture signal taken corresponding pick-up lens, sends control computer to, carries out manually/auto judge or comparison for subsequent step.
Because I/O port and the LED light source emitting brightness control unit of electric drive worm and wormwheel moving guide rail assembly, camera lens and output end of image thereof, control computer all can adopt existing commercially available prod, therefore its concrete formation structure and operation principle are no longer narrated at this.
The technical program can provide respectively or simultaneously the test of bright field (the first video camera instrument connection of corresponding first test space), details in a play not acted out on stage, but told through dialogues (the second video camera instrument connection of corresponding second test space) or bright details in a play not acted out on stage, but told through dialogues (corresponding the 3rd video camera instrument connection), to meet different clients' needs, the output signal that Gu Tuzhong is positioned at the camera lens 18,19 of details in a play not acted out on stage, but told through dialogues and bright details in a play not acted out on stage, but told through dialogues test seat in the plane dots.
Because the technical solution of the utility model adopts two adjacent and separate airtight test space structures, the airtight testing light source environment being isolated from the outside is provided, the defect of having avoided existing method of testing to test in darkroom, has ensured the objectivity of test result.
It adopts two groups of separate light sources, between the bright dipping of two groups of back projection type LED light sources, does not mutually crosstalk, and has improved measuring accuracy.
It adopts LED light source assembly, and light source power consumption is little, good reliability, and the optical parametric high conformities such as colourity, brightness, the high conformity of test result is can reproducibility high.
The utility model can be widely used in the performance parameter test field of various video camera solid-state imaging members/means.
Claims (8)
1. for testing a LED light source lamp box for video camera dynamic range, comprise light source and test card, it is characterized in that:
The one airtight test space is set;
In airtight case structure, be divided into two adjacent, separate first test space and second test spaces through longitudinal separation plate;
In the first/the second test space, correspondence arranges the first LED light source and the second LED light source respectively;
Between the tested picture pick-up device camera lens and LED light source exiting surface of first test space, correspondence is placed with the first transmission test card holder; In the first transmission test card holder, be provided with the first transmission test card;
Between the tested picture pick-up device camera lens and LED light source exiting surface of second test space, correspondence is placed with the second transmission test card holder; In the second transmission test card holder, be provided with the second transmission test card;
Lay respectively at the first LED light source and the second LED light source in the first/the second test space, be arranged on the first/the second moving slider by correspondence respectively; The the first/the second described LED light source, under the drive of described the first/the second electric moveable slide block, moves along the longitudinal direction of described the first/the second test space;
At the front end of the described airtight test space, be provided with the front panel of the first video camera instrument connection and the second video camera instrument connection;
The longitudinal axis of its first or second test space, overlaps with the exiting surface of the first or second LED light source and the normal of the transparent test card plane of delineation respectively.
According to claimed in claim 1 for testing the LED light source lamp box of video camera dynamic range, it is characterized in that the first/the second described LED light source comprises at least respectively a backlight type LED light emitting source assembly and corresponding power subsystem and LED light source emitting brightness control unit thereof.
3. it is characterized in that on described front panel for testing the LED light source lamp box of video camera dynamic range according to claimed in claim 1, be also provided with the 3rd video camera instrument connection; The center line of its 3rd video camera instrument connection overlaps with the longitudinal axis of the longitudinal separation plate between described first and second test spaces.
4. it is characterized in that the center line of described the first/the second video camera instrument connection according to claimed in claim 1 for testing the LED light source lamp box of video camera dynamic range, corresponding with the longitudinal axis of the first/the second test space parallel or overlap respectively.
According to claimed in claim 1 for testing the LED light source lamp box of video camera dynamic range, it is characterized in that described moving slider comprises the electric drive worm and wormwheel moving guide rail assembly with moving slider; Be positioned at the LED light source on described moving slider, under the driving of electric drive worm and wormwheel moving guide rail assembly, move along the longitudinal axis of the described test space.
6. it is characterized in that between described LED light source and front panel for testing the LED light source lamp box of video camera dynamic range according to claimed in claim 1, be provided for placing the test card support of test card, transparent test card is set on test card support.
According to claimed in claim 1 for testing the LED light source lamp box of video camera dynamic range, the video camera instrument connection that it is characterized in that described front panel is flexible coupling through be flexible coupling shading sleeve and camera lens to be measured of elasticity.
According to claimed in claim 1 for testing the LED light source lamp box of video camera dynamic range, it is characterized in that described transparent test card comprises transparent mode gradation test card.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320604020.0U CN203708393U (en) | 2013-09-27 | 2013-09-27 | LED light source light box used for testing dynamic range of camera |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320604020.0U CN203708393U (en) | 2013-09-27 | 2013-09-27 | LED light source light box used for testing dynamic range of camera |
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| CN203708393U true CN203708393U (en) | 2014-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093248A (en) * | 2017-12-19 | 2018-05-29 | 广州诺晨电子有限公司 | A kind of test of light source system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093248A (en) * | 2017-12-19 | 2018-05-29 | 广州诺晨电子有限公司 | A kind of test of light source system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20170927 |