CN105049833A - Stereopsis check method and device adopting symmetrical adjustable backlight structure - Google Patents
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Abstract
A stereopsis check device adopting a symmetrical adjustable backlight structure comprises a symmetrical adjustable backlight device, a pupil position tracking module, a synchronization signal extraction module, a signal processing module and an image display screen. The symmetrical adjustable backlight device comprises a symmetrical adjustable optical component and an addressable light source component. The symmetrical adjustable optical component comprises a light guide module and a symmetrical adjustable imaging module. The light guide module comprises a collecting lens, a light guide device and a triangular prism. The symmetrical adjustable imaging module (M) comprises a lens, a lens switching device, an enoscope, a spectroscope and a refraction reflector. The signal processing module controls the addressable light source component in the adjustable backlight structure according to received pupil position information and a video synchronization signal. While a left image is displayed, the signal processing module lightens a corresponding luminescent unit according to left eye pupil position information, so that the light is converged at the left eye pupil. While a right image is displayed, the signal processing module lightens a corresponding luminescent unit according to right eye pupil position information, so that the light is converged at the right eye pupil.
Description
One, technical field
The present invention relates to technical field of information display, particularly adopt a kind of stereopsis testing fixture of symmetrical adjustable backlight structure.
Two, background technology
Stereo blind refers to that stereoscopic vision is lacked.The third dimension of people sets up like this: eyes watch object attentively simultaneously, and eyes sight line intersects at a bit, is blinkpunkt, and the luminous point reflected back into retina from blinkpunkt is corresponding, and signal is proceeded to brain visual center and synthesizes the complete picture of an object by these 2.Not only seen this point clearly, and the distance, the degree of depth, convex-concave etc. between this point and surrounding objects can distinguish out, the picture become like this is exactly three-dimensional picture, and this vision is stereoscopic vision.The binocular vision function of people lacks stereoscopic vision once generation obstacle, and to the scenery degree of depth of space outerpace with apart from just judging, such illness is called stereo blind (incidence of disease of stereo blind is 2.6%, and stereoscopic vision is abnormal then up to 30%).Stereo blind is nearly ten years just by a kind of illness in eye that biologist finds, it is a kind of ophthalmology disease more serious than yctalopia, colour blindness and anomalous trichromatism.Suffer from stereo blind person and can not be engaged in pilot, the work such as trainman.Colour blindness is congential dyschromatopsia, and achromate can not differentiate shades of colour in nature spectrum or certain color; To the then title anomalous trichromatism of the resolving ability difference of color.Anomalous trichromatism patient, although can see the color that normal person sees, the ability of identification color is slow or very poor.
The detection method of traditional stereo blind has stereoscopic vision meter inspection technique, stereoacuity test chart inspection technique, stereoscopy, polarised light experimental check method.Some are had to detect the inspection figure of blind Detecting, as Chinese patent CN102529470A for solid at present.It is single all to there is detection sample in above-mentioned method of testing, and detecting distance is limited, there is the problems such as monocular cue.
Existing stereo display implementation mainly contains parallax solid, and body is three-dimensional and holographic three-dimensional three kinds.Wherein body solid and the holographic three-dimensional problem that all there is monocular cue, and parallax solid is projected respectively in the right and left eyes of people by pictures different for two width, brain fusion and form stereoscopic vision, therefore parallax solid has its advantageous advantage for the detection of stereo blind.Traditional eye test mode, such as near vision test, anomalous trichromatism and colour blindness test need multiple checkout facility, and portability is poor.Stereo blind detects to be needed to overcome the deficiency in above-mentioned technology.
Three, summary of the invention
The object of the invention is, in order to solve, in stereo blind testing process, detect sample single, and detecting distance is limited, there is the problems such as monocular cue, and propose a kind of adopt symmetrical adjustable backlight structure can multiple spurs from the stereopsis testing fixture of viewing.The present invention is realized by following technological means.Pupil position tracking module obtains beholder's pupil position information, signal processing module is after receiving pupil position information and video synchronization signal, control the left and right pupil that corresponding left and right figure is projected beholder by symmetrical adjustable backlight structure respectively, make the left eye of beholder can only see left image on image display panel, right eye can only see the right image on image display panel.
Technical scheme of the present invention: a kind of multiple spurs of symmetrical adjustable backlight structure, from the free stereo testing apparatus of viewing, comprises symmetrical adjustable backlight device, pupil position tracking module, synchronizing signal extraction module, signal processing module, image display panel; Symmetrical adjustable backlight device comprises symmetrical adjustable optical assembly, addressable light source assembly; Wherein, symmetrical adjustable optical assembly comprises again guide-lighting module and the adjustable imaging modules of symmetry, and guide-lighting module comprises: condenser, leaded light device and triangular prism; Symmetrical adjustable imaging modules (M) (comprising: lens, lens switching device shifter, enocscope, spectroscope and refractive power speculum); Signal processing module, according to the pupil position information received and video synchronization signal, controls the addressable light source assembly in adjustable backlight structure.While the left image of display, corresponding luminescence unit is lighted according to pupil of left eye positional information by signal processing module, realizes light and converges at pupil of left eye place; While the right image of display, corresponding luminescence unit is lighted according to pupil of right eye positional information by signal processing module, realizes light and converges at pupil of right eye place; The present invention is a kind of free stereo testing apparatus of multiple spurs from viewing of symmetrical adjustable backlight structure.
Guide-lighting module is adopted to realize the conduction of light, the light sent from addressable light source assembly, through the guide-lighting module be made up of condenser, leaded light device, triangular prism; The light sent from guide-lighting module achieves the separation of light through spectroscope, the ray cast of half is to refractive power speculum above, and the half light of light splitting is through the reflecting focal of refractive power speculum; Second half ray cast is to refractive power speculum reflecting focal below; The upright position of the light path of light that guide-lighting module sends is fixed with the lens of two to five different focal or set of lenses and lens switching device shifter, and scioptics switching device shifter makes different lens be in described light path of light; Symmetrical adjustable imaging modules realizes the lens combination corresponding to different distance.The application of lens switching device shifter, reaches different optical effects, achieves beholder and can watch stereoeffect in different distance.
Viewing window is pooled in certain distance with the light that addressable light source assembly sends by symmetrical expression backing structure; At different viewing distance, the proportionate relationship that viewing window width becomes to fix with luminescence unit length, proportionality constant is β
1, β
2, β
3, namely represent the proportionality constant of different distance respectively;
In above formula, W represents the width of viewing window, and w represents the width of luminescence unit, and T represents the distance between two viewing windows, and t represents the distance between two luminescence units.
In order to realize good stereo display effect, distance T between viewing window width W and two viewing windows needs to remain within certain scope, therefore, after β changes, the lens switching device shifter in symmetrical adjustable imaging modules needs to carry out lens switching.
Device adopts symmetrical adjustable backlight structure to provide synchronous backlight for image display panel.Regulate the lens switching device shifter in symmetrical adjustable optical assembly, achieve the different lens combinations in symmetrical adjustable imaging modules, coordinate the light that addressable light source assembly sends, achieve at diverse location after symmetrical adjustable optical assembly and converge and formed viewing window, thus beholder can watch stereoeffect in different distances.Guide-lighting module is adopted to realize the conduction of light.The light sent from addressable light source assembly, through the guide-lighting module be made up of condenser, leaded light device, triangular prism, effectively adds light path.Leaded light device application total reflection principle, effectively reduces dispersion angle and the transmission loss of light, improves light utilization.
The mode adopting poly-lens to combine achieves the effect that light converges in different distance.The light that addressable light source assembly sends, after poly-lens combination, achieves the convergence of light in different distance in conjunction with lens switching device shifter, thus achieves stereoeffect.
Adopt synchronizing signal extraction module.After extracting the synchronizing signal of video, signal is arranged and denoising.Interconnected in order to realize module, signal amplitude is limited, further increases signal quality simultaneously, improve the stability of system.
Adopt addressable light source assembly.Signal processing module receives from after the pupil position information of pupil position tracing module, is lighted by the luminescence unit of correspondence position in addressable light source assembly.Signal processing module receives the image display panel synchronizing signal from synchronizing signal extraction module, and the luminescence unit in addressable light source assembly is lighted in timesharing.When showing right image, only have the luminescence unit of corresponding beholder's right eye to be lit, namely beholder can only see right image; In like manner, when showing left image, only have the luminescence unit of corresponding beholder's left eye to be lit, namely beholder can only see left image.
The invention has the beneficial effects as follows: the invention provides a kind of adopt symmetrical adjustable backlight structure can multiple spurs from viewing free stereo testing apparatus compared with prior art, its remarkable advantage is:
1, adopt symmetrical adjustable backlight structure, greatly strengthen backlight uniformity and brightness;
2, by regulating lens switching device shifter, achieving and watching stereoeffect in different distance;
3, adopt synchronizing signal extraction module and symmetrical adjustable backlight structure, there is good image quality, greatly reduce three-dimensional string shadow;
4, leaded light device is adopted, compact conformation, small and exquisite, easy to carry;
5, pupil position tracing module is adopted, without the need to wearing auxiliary equipment;
6, playing film source is the left images HD video with parallax.Display image reduces without resolution, has very strong stereoeffect;
7, freely can realize 2D and 3D to switch, applicability is strong.Detect sample-rich, can multiple spurs from viewing, compact conformation, high definition etc.
Four, accompanying drawing explanation
Fig. 1 is the overall structure end view of an embodiment, and dotted portion M is symmetrical adjustable imaging modules;
Fig. 2 free stereo testing apparatus principle stereogram;
The symmetrical adjustable backlight structure of Fig. 3 can multiple spurs from viewing schematic diagram;
Fig. 4 condenser schematic diagram;
Fig. 5 leaded light device schematic diagram;
Fig. 6 triangular prism schematic diagram;
Fig. 7 Fresnel Lenses schematic diagram;
Fig. 8 lens switching device shifter schematic diagram;
Fig. 9 spectroscope schematic diagram;
Figure 10 refractive power speculum schematic diagram;
Figure 11 addressable light source assembly schematic diagram;
Figure 12 signal processing module block diagram.
Five, embodiment
In figure, luminescence unit 1, condenser 2, leaded light device 3, triangular prism 4, triangular prism 5, leaded light device 6, triangular prism 7, lens switching device shifter 8, lens 9, lens 10, lens 11, spectroscope 12, enocscope 13, enocscope 14, lens 15, lens 16, enocscope 17, enocscope 18, LCD display 20, symmetrical adjustable imaging modules M, luminescence unit width w, array of light emitting cells centre distance t, watch window width W, the spacing T of watch window, beholder position A, beholder position B, luminescence unit is to the distance U of symmetrical adjustable backlight structure, viewing ratio V (A), viewing ratio V (B), virtual image object distance V '.
Below in conjunction with drawings and Examples, the present invention will be further described, and basic thought of the present invention utilizes time-division principle to realize stereoeffect.What be necessary to herein means out is; following embodiment is only described further for the present invention; limiting the scope of the invention can not be interpreted as; the ripe personnel of this art make some nonessential improvement and adjustment according to foregoing invention content to the present invention, still belong to protection scope of the present invention.
Symmetrical adjustable backlight structure can multiple spurs from viewing a free stereo testing apparatus, whole device is made up of symmetrical adjustable backlight structure, beholder's location tracking module, synchronizing signal extraction module and image display panel.In this embodiment, what image display panel adopted is LCD (120HZ) display.Symmetrical adjustable backlight structure comprises symmetrical adjustable optical assembly, addressable light source assembly.Wherein, symmetrical adjustable optical assembly comprises again guide-lighting module (comprising: condenser, leaded light device and triangular prism) and the adjustable imaging modules of symmetry (comprising: lens, lens switching device shifter, enocscope, spectroscope and refractive power speculum).
System finishing principle is as follows: signal processing module receives the video synchronization signal from synchronizing signal extraction module, while left image shows, lights luminescence unit corresponding with left image in addressable light source assembly, for image provides synchronous backlight; While right image shows, light luminescence unit corresponding with right image in addressable light source assembly, for image provides synchronous backlight.Signal processing module receives the position of human eye information from pupil position tracing module, lights corresponding luminescence unit in addressable light source assembly.After obtaining left eye information, light the luminescence unit that in addressable light source assembly, left eye is corresponding, light, after symmetrical adjustable backlight structure, realizes in left eye position converging, forms watch window.In like manner, after obtaining right eye information, light the luminescence unit that in addressable light source assembly, right eye is corresponding, light is after symmetrical adjustable backlight structure, and right eye position achieves convergence, forms watch window, as Fig. 2.Lens switching device shifter in symmetrical adjustable imaging modules can realize the combination of different lens, coordinates the luminescence unit in addressable light source assembly, achieves the light collection in different distance, make beholder can watch stereoeffect in different distances.
Adopt addressable light source assembly.Signal processing module receives from after the pupil position information of pupil position tracing module, is lighted by the luminescence unit of correspondence position in addressable light source assembly.Signal processing module receives the image display panel synchronizing signal from synchronizing signal extraction module, and the luminescence unit in addressable light source assembly is lighted in timesharing.When showing right image, only have the luminescence unit of corresponding beholder's right eye to be lit, namely beholder can only see right image; In like manner, when showing left image, only have the luminescence unit of corresponding beholder's left eye to be lit, namely beholder can only see left image.
Based on above general principle, described symmetrical adjustable backlight structure (as Fig. 1) comprises symmetrical adjustable optical assembly and addressable light source assembly.In this embodiment, addressable optical module is made up of (as Figure 11) a series of highlighted LED close-packed arrays, coordinates drive circuit to realize the light on and off of any LED.From the light that highlighted LED sends, the compression of light in YZ plane can be realized through condenser (2), in this embodiment, adopt prism mirror to realize the compression (as Fig. 4) of light, the light dispersed is compressed into nearly directional light.Light through overcompression enters into the leaded light device (3,6) of guide-lighting module, in this embodiment, adopt light guide plate, utilizes its total reflection prism transmission principle (as Fig. 5) to achieve the lossless propagation of light.Light enters into triangular prism (4,5) from light guide plate, achieves the upset of radiation direction, finally sends from triangular prism (7).
In this embodiment, the light sent from guide-lighting module achieves the separation of light through spectroscope, and the ray cast of half is to speculum above, and the reflection through refractive power speculum after light upset achieves the convergence of light at specific range; In like manner, the ray cast of half is to speculum below.Be fixed with three lens at vertical mechanical structure, scioptics switching device shifter can make different lens be in light path.The application of lens switching device shifter, reaches different optical effects, achieves beholder and can watch stereoeffect in different distance.Converging the lens adopted is Fresnel Lenses.By the combination of two kinds of Fresnel Lenses, achieve the convergence of light in different distance.Two kinds of Fresnel Lenses combinations are equivalent to the effect of single Fresnel Lenses, are described below with single Fresnel Lenses lens.
In Fresnel Lenses one times of focal length, place highlighted LED (1), form the virtual image a long way off through Fresnel Lenses.Light the difference of LED position, the position of the virtual image also different (as Fig. 7).Virtual image image distance and object distance U have following relation:
Wherein f is the focal length of Fresnel Lenses, and in this embodiment, Fresnel Lenses 15 is identical with the parameter of Fresnel Lenses 16, and the focal length of Fresnel Lenses 9, Fresnel Lenses 10 and Fresnel Lenses 11 is different.By regulating lens switching device shifter (as Fig. 8), achieving different Fresnel Lenses combinations, light is converged in different distances, reaching the effect of multiple spurs from viewing.As shown in Figure 3, for the purpose of simple, be described with two kinds of distances, coordinate highlighted LED while regulating lens switching device shifter, achieve the convergence at different distance light.
In this embodiment, have employed spectroscope (prism) as light-splitting device (as Fig. 9), achieve the separation of light, greatly enhance brightness uniformity.Light is propagated from upper and lower both direction, and by reflective mirror 13,14, Fresnel Lenses 15,16, reflective mirror 17,18, achieves the upset of light.Finally project (as Figure 10) on refractive power speculum, after LCD display (20), achieve the convergence of light.Synchronizing signal extraction module circuit may with reference to the earlier application of the applicant.
In this embodiment, pupil position tracking module is made up of software and hardware.Hardware comprises the camera of three different focal, viewing distances corresponding different respectively.Adopt Adaboost algorithm to carry out the detection of candidate point, then adopt ASM (ActiveShapeModel) algorithm based on SIFT feature to carry out the accurate location of face.Its available algorithm is as follows:
1, Face detection.Face detection method has the ASM Face detection based on SIFT feature.Traditional ASM algorithm adopts the half-tone information of local feature region to carry out calculating mahalanobis distance, and fitting precision is not high, rotates poor robustness.Therefore adopt SIFT (Scale invariant features transform) feature as the local feature region of ASM algorithm.SIFT is a kind of based on space scale, to image scaling, rotate the image local feature that even affine transformation remains unchanged and describe operator, and for the state variation of face, the environment residing for scene and imaging equipment characteristic have good adaptability.
2, pupil position is followed the tracks of.Under normal circumstances, the change in location of pupil is unhappy, utilizes this characteristic can realize fast detecting and the prediction of pupil position.Utilize pupil position to change this characteristic unhappy, detection algorithm can detect around the pupil position in previous frame, reduces detection range.Utilize the continuous position information of pupil, the position that pupil in next frame may occur can be predicted, reduce detection range equally.Kalman algorithm, TLD algorithm are all conventional track algorithms.
In this embodiment, signal processing module adopts AVR single chip, follows the tracks of mould interconnected, realize interconnected by winding displacement and synchronizing signal extraction module (as Figure 12) by serial ports and pupil position.Signal processing module, according to the pupil position information received and video synchronizing information, controls the light on and off of highlighted LED in addressable light source assembly.Concrete system block diagram is as Figure 12.The concrete scheme related to do not described in detail can with reference to the following patent application of the applicant (inventor): 201310615833.4 based on the pupil positioning method of hybrid projection, 201310627291.2 based on the pupil position filtering method of motion relevance, 201310612559.5 tablet non-auxiliary stereo display device and method.
Although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, not departing from scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (6)
1. adopt a stereopsis testing fixture for symmetrical adjustable backlight structure, it is characterized in that comprising symmetrical adjustable backlight device, pupil position tracking module, synchronizing signal extraction module, signal processing module, image display panel; Symmetrical adjustable backlight device comprises symmetrical adjustable optical assembly, addressable light source assembly; Wherein, symmetrical adjustable optical assembly comprises again guide-lighting module and the adjustable imaging modules of symmetry, guide-lighting module comprises: condenser, leaded light device and triangular prism, and symmetrical adjustable imaging modules (M) comprising: lens, lens switching device shifter, enocscope, spectroscope and refractive power speculum; Signal processing module, according to the pupil position information received and video synchronization signal, controls the addressable light source assembly in adjustable backlight structure.While the left image of display, corresponding luminescence unit is lighted according to pupil of left eye positional information by signal processing module, realizes light and converges at pupil of left eye place; While the right image of display, corresponding luminescence unit is lighted according to pupil of right eye positional information by signal processing module, realizes light and converges at pupil of right eye place; Guide-lighting module is adopted to realize the conduction of light, the light sent from addressable light source assembly, through the guide-lighting module be made up of condenser, leaded light device, triangular prism; The light sent from guide-lighting module achieves the separation of light through spectroscope, the ray cast of half is to refractive power speculum above, and the half light of light splitting is through the reflecting focal of refractive power speculum; Second half ray cast is to refractive power speculum reflecting focal below; The upright position of the light path of light that guide-lighting module sends is fixed with the lens of two to five different focal or set of lenses and lens switching device shifter, and scioptics switching device shifter makes different lens be in described light path of light; Symmetrical adjustable imaging modules realizes the lens combination corresponding to different distance.
2. the stereopsis testing fixture of the symmetrical adjustable backlight structure of employing according to claim 1, is characterized in that the light with addressable light source assembly sends by symmetrical expression backing structure pools viewing window in certain distance; At different viewing distance, the proportionate relationship that viewing window width becomes to fix with luminescence unit length, proportionality constant is β
1, β
2, β
3, namely represent the proportionality constant of different distance respectively;
In above formula, W represents the width of viewing window, and w represents the width of luminescence unit, and T represents the distance between two viewing windows, and t represents the distance between two luminescence units.
3. the stereopsis testing fixture of the symmetrical adjustable backlight structure of employing according to claim 1, is characterized in that described symmetrical adjustable backlight structure, for image display panel provides synchronous backlight; Regulate the lens switching device shifter in symmetrical adjustable optical assembly, achieve the different lens combinations in symmetrical adjustable imaging modules, coordinate the light that addressable light source assembly sends, achieve at diverse location after symmetrical adjustable optical assembly and converge and formed viewing window, thus beholder can watch stereoeffect in different distances.
4. the stereopsis testing fixture of the symmetrical adjustable backlight structure of employing according to claim 1, is characterized in that adopting guide-lighting module to realize the conduction of light; The light sent from addressable light source assembly, through the guide-lighting module be made up of condenser, leaded light device, triangular prism.
5. the stereopsis testing fixture of the symmetrical adjustable backlight structure of employing according to claim 1, is characterized in that adopting synchronizing signal extraction module, after extracting the synchronizing signal of video, arranges and denoising signal.
6. symmetrical adjustable backlight structure according to claim 1, is characterized in that adopting addressable light source assembly; Signal processing module receives from after the pupil position information of pupil position tracing module, is lighted by the luminescence unit of correspondence position in addressable light source assembly.Signal processing module receives the image display panel synchronizing signal from synchronizing signal extraction module, and the luminescence unit in addressable light source assembly is lighted in timesharing; When showing right image, only have the luminescence unit of corresponding beholder's right eye to be lit, namely beholder can only see right image; In like manner, when showing left image, only have the luminescence unit of corresponding beholder's left eye to be lit, namely beholder can only see left image.
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