CN102626304A - Head-mounted wireless video eye tracker - Google Patents
Head-mounted wireless video eye tracker Download PDFInfo
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- CN102626304A CN102626304A CN2012101158225A CN201210115822A CN102626304A CN 102626304 A CN102626304 A CN 102626304A CN 2012101158225 A CN2012101158225 A CN 2012101158225A CN 201210115822 A CN201210115822 A CN 201210115822A CN 102626304 A CN102626304 A CN 102626304A
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Abstract
The invention relates to a head-mounted wireless video eye tracker which is independently designed. Information is exchanged through analysis software of a wireless router and a computer without any peripheral cable connection. Multiple technologies such as an embedded system, image compression and a wireless local area network are comprehensively applied for the head-mounted wireless video eye tracker, eye movement video information is obtained by applying camera with an infrared LED illumination, image compression is completed through a digital signal processor (DSP) chip after the eye movement video information is decoded, then the decoded eye movement video information is transmitted to the computer by the wireless router through the wireless transmission module, a control signal sent by the analysis software of the computer, a corresponding visual stimulation dynamic image is generated, and is displayed through video eyeglasses arranged on a helmet to guide a subject for generating eye tracking information. The analysis software running on the computer also realizes image decompression and pupil location to obtain eyeball movement locus, so that multiple test items are tested.
Description
Technical field
The present invention relates to a kind of wireless video eye movement appearance; Be particularly related to a kind of integrated application embedded system, the helmet-type wireless video eye movement appearance of Image Compression, wireless local area network technology, eye tracking technology is used the photographic head that has the infrared LED illumination and is obtained the eye movement video; Accomplish compression of images through the decoding back by digital signal processor (DSP) chip; Master computer through the WIFI module is transferred in the WLAN is realized the tracking of eyeball location, and receives the control signal that main frame sends, and produces corresponding visual stimulus dynamic image; Video eyeglasses shows on the helmet by being installed in, to accomplish the test of multiple pilot project.
Background technology
Along with the development of image analysis technology, the eyeball location is ripe gradually and practicability with tracking technique.Use eye movement information and can carry out multiple psychology and physiology test.Can carry out sight line through the eyeball location and follow the trail of, realize man-machine interaction; Some scholars can carry out people's personality and mental analysis through extracting the ocular movement characteristic of people in reading process; " the eyes are the windows of the mind " through the reaction of experimenter to the visual stimulus information of sensitivity, can also be carried out ocular movement and pupil contraction and expansion analysis, realizes multiple application such as " detecting a lie ".
Aspect the physiological decease test, eye movement analysis also shows its using value gradually.Especially (nystagmus, Nystagmus) signal analysis can realize the detection to multiple ophthalmology, internal ear, vestibule and nervus centralis disease through eyeball is shaken.Medically; Symptoms such as nystagmus is a kind of involuntary, ocular movement that rhythmicity, reciprocating swing are arranged, and often the disease by visual system, extraocular muscles, inner ear labyrinth and central nervous system causes, patient's clinical manifestation is amblyopia, stravismus, visual fatigue, compensatory head position, have a rest eye position and stereoscopic vision acutance weaken; Also usually occur together in heritability albinism, achromatopsia; Also possibly occur together in the forming process of congenital cataract, sickness rate is high, and harm is serious.Medical research shows that diseases such as nystagmus symptom and senile dementia, parkinsonism, epilepsy, internal ear and nervus centralis disease, vertigo, equilibrium function obstacle have substantial connection.In recent years, the examination of nystagmus method becomes the important diagnostic means of these diseases gradually.
At present; Existing in the world many moneys video frequency electronystagmograph (Videonystagmography, VNG) appearance comes out, the most representative House board VNG that has U.S. EDI company to produce; Adopt the method for infrared video shooting directly to enroll the movements,nystagmic image; Handle through computer digital image, real-time monitored is analyzed nystagmus phase of wave related parameter, and the detection method of a kind of brand-new, contactless, not damaged, no background noise and high definition image can be provided for the nystagmus record; The VNG product that France Synapsys company produces; Can sweep test, steadily tracking test, rotation test, position and multiple tests such as spontaneous nystagmus test, gaze test, Dix-Hallpike and temperature experiment to the experimenter, have the bigger market share in Europe.
At present, the VNG instrument has certain defective owing to mentality of designing and technical limitations at that time on using in the world; Mainly show: adopt wire transmission in the signals collecting link; Unavoidably there are many cable lines in instrument, causes and uses inconvenience, and the testing program that part is new can't be implemented; Aspect demonstration, adopt large screen projection or LED lamp to manufacture display screen, need subject's head position relative fixed; Aspect the nystagmus analysis, adopt oculomotor amplitude, frequency informations more, do not have fully to analyze the energy and the statistical information of nystagmus, cause eye movement characteristics extraction aspect to have weak link.
For this reason, the present invention has designed a kind of helmet-type wireless video eye movement appearance, and design object is wireless, small-sized, light, easy-to-use, reliable.For this reason; The Davinci DM6446 dual core processor that adopts TI company is as acp chip; This processor comprises the ARM926E-J kernel of a 297MHz and the C64x DSP kernel of a 594Mhz, supports Linux2.6 operating system, can move various audio/video encoding/decoding algorithms.Application has the photographic head acquisition eye movement video that infrared LED throws light on, and adopts H.264 standard completion compression of images through the decoding back by C64x DSP kernel, follows the tracks of through the master computer realization eyeball location that the WIFI module is transferred in the WLAN.ARM926E-J kernel operation (SuSE) Linux OS is realized various control functions; Receive the control signal that main frame sends; Produce the required visual stimulus dynamic image of various pilot projects, video eyeglasses shows on the helmet by being installed in, and realizes the integrated independent design of instrument.
Summary of the invention
To the defective of existing various eye movement appearance, the present invention has designed a kind of helmet-type wireless video eye movement appearance.Use embedded system and wireless local area network technology, functional module such as picture signal collection, compression, transmission, demonstration and control and parts are carried out integrated design, realize wireless, small-sized, the portable function of eye movement appearance.
A kind of helmet-type wireless video eye movement appearance comprises the helmet and is arranged on core circuit plate, display system and at least one camera system in the said helmet.
Wherein: said core circuit plate comprises battery supply, video coding, at least one video decode, processor, DC-DC, wireless transport module and memorizer; Said battery supply is directly given the power supply of display system and camera system, and battery supply is also supplied power to processor through DC-DC conversion back.
Processor is shown by display system after the dynamic vision stimulating image of memory stores is encoded through video.
Camera system is obtained the eye movement analog video signal behind the dynamic vision stimulating image that is shown by display system, converts Y, Cr, Cb digital signal into by video decode, the video interface input processor of treated device; Processor outwards sends through wireless transport module this digital signal compression (adopting H.264 video compression standard) back.
Above-mentioned display system is made up of LED display and optical imaging system, and the light path that optical imaging system utilizes some lens assemblies to constitute is amplified LED display.Camera system is made up of the photographic head infrared LED peripheral with being distributed in photographic head.
Above-mentioned processor also is provided with emulation interface, RS232 serial ports and network interface.
Above-mentioned core circuit plate passes through wireless transport module with wireless local net mode and computer system exchange message, or passes through network interface with cable LAN mode and computer system exchange message.
Video eye movement appearance adopts the helmet-type structural design, and headpiece case adopts double-decker, and all mounting materials, electrical equipment, internal connection line all are installed between the two-layer housing, makes instrument independent, compact, light, strengthens easy-to-use performance.
Description of drawings
Fig. 1 is the circuit structure block diagram of wireless video eye movement appearance;
Fig. 2 is a helmet-type wireless video eye movement appearance assembly scheme of installation;
Fig. 3 is a helmet-type wireless video eye movement appearance analytical system composition diagram;
Among the figure: 1-core circuit plate; The 2-display system; 3.1-the camera system I, 3.2-camera system II; The 4-helmet; The 5-computer system; The 6-wireless router; 1.1-battery supply; 1.2-video coding; 1.31-video decode I; 1.32-video decode II; 1.4-processor; 1.5-DC-DC; 1.6-emulation interface; 1.7-RS232 interface; 1.8-network interface; 1.9-wireless transport module.
The specific embodiment
The present invention is further described for a non-limiting example below in conjunction with accompanying drawing.
A kind of helmet-type wireless video eye movement appearance comprises the helmet 4 and the core circuit plate 1, display system 2, camera system I 3.1 and the camera system II 3.2 that are arranged on 4 li of the said helmets.
Wherein: said core circuit plate 1 comprises battery supply 1.1, video coding 1.2, video decode I 1.31, video decode II 1.32, processor 1.4, DC-DC1.5, wireless transport module 1.9 and memorizer 1.10; Said battery supply 1.1 is directly given display system 2 and camera system power supply, and battery supply 1.1 is provided by the 9V rechargeable battery, and battery supply 1.1 gives processor 1.4 power supplies after also converting 9V into 3.7V through DC-DC1.5.
After the dynamic vision stimulating image that processor 1.4 is stored memorizer 1.10 passes through video coding 1.2, show by display system 2.
Camera system is obtained the eye movement analog video signal behind the dynamic vision stimulating image that is shown by display system 2, converts Y, Cr, Cb digital signal into by video decode, the video interface input processor 1.4 of treated device 1.4; Outwards send through wireless transport module 1.9 1.4 pairs of this digital signal compressions of processor back.
Processor 1.4 adopts Davinci DM6446 dual core processor; Davinci DM6446 comprises the ARM926E-J kernel of a 297MHz and the C64x DSP kernel of a 594Mhz; Wherein the ARM926E-J kernel moves linux operating system, accomplishes the control function of system; The DSP kernel is accomplished the compression of images function.
The helmet 4 is carriers of each other assembly; Core circuit plate 1 is installed on the helmet, and display system 2 is positioned at the oblique upper of people's helmet 4 back eyes, with the about 3cm of qn eye distance; Make eyes can normally observe the virtual giant-screen panorama scope that display system 2 appears; Do not influence simultaneously photographic head again and obtain eye image, camera system (photographic head and infrared illuminator) is installed in display system 2 belows, and infrared illuminator is made up of 12 infrared LEDs; About each 6, be evenly distributed on the photographic head periphery.Optical presentation system 2 and camera system 3 are installed on the helmet, can carry out the fine setting of position and angle.
The performing step of eye movement appearance is following:
1) analysis software that operates on the computer system 5 connects through wireless router 6 and helmet-type wireless video eye movement appearance, opens up by the eye movement appearance to the eye movement video signal of computer system 5 with by the user command bidirectional transfer of information passage of computer system 5 to helmet-type wireless video eye movement appearance.
2) experimenter's helmet formula wireless video eye movement appearance, adjustment display system 2 can normally be observed eyes, according to the adjustment of the analysis software images displayed on the computer system 5 camera system 3, makes eyes be presented at the image centre position.
3) user is through wireless transport module 1.9 sendaisle select commands (both to the selection of left and right sides passage, with the movement locus of realizing corresponding right and left eyes extracted) and the pilot project order of the analysis software on the computer system 5 to helmet-type wireless video eye movement appearance.
4) helmet-type wireless video eye movement appearance core circuit plate 1 generates the dynamic vision stimulating image according to selected pilot project, is shown by display system 2.
5) helmet-type wireless video eye movement appearance core circuit plate 1 is according to collection, compression and the transmission of selected passage completion eye movement signal, and concrete steps are following:
(a) under the infrared LED lighting condition; Eye movement video signal by the photographic head of selected passage (corresponding to images of left and right eyes) obtains is delivered to core circuit plate 1; Convert Y, Cr, Cb digital signal into by video decode I or video decode II, by the video interface reception of Davinci DM6446 processor 1.4.
(b) the DSP kernel operation image compressed software of Davinci DM6446 processor 1.4, adopting H.264, the video compression standard completion obtains compressed data packets to the compression of video signal (above-mentioned digital signal).
(c) compressed data packets is sent to wireless transport module 1.9, adopts the WIFI mode to pass through wireless router 6 with wireless local net mode and computer system 5 exchange messages.
(d) the ARM kernel of Davinci DM6446 processor 1.4 operation linux embedded system; Its application program is realized the coordination and the control of whole system; Comprise information exchange between system initialization, the double-core, from the generation of the reception of computer system 5 order and parsing, control signal, safeguards system operate as normal.
6) display system is made up of LED display and optical imaging system; Wherein LED display reception and Reality Head-mounted Displays formula wireless video eye movement appearance core circuit plate 1 generate the dynamic vision stimulating image according to selected pilot project; Optical imaging system comprises light path and lens assembly; Be used for the LED screen is amplified, personnel to be tested are formed virtual giant-screen visual effect.
7) computer system 5 analysis software provide the pupil location of reception that user interface, realization and the communication of eye movement appearance is connected, accomplishes compressed data packets and decompress(ion), eye image; Finally obtain the eyeball moving track under all kinds of experimental conditions, for follow-up feature extraction and physiology, psychological research provide information support.
Claims (6)
1. helmet-type wireless video eye movement appearance is characterized in that: comprise the helmet (4) and be arranged on core circuit plate (1), display system (2) and at least one camera system of the said helmet (4) lining;
Wherein: said core circuit plate (1) comprises battery supply (1.1), video coding (1.2), at least one video decode, processor (1.4), DC-DC (1.5), wireless transport module (1.9) and memorizer (1.10); Said battery supply (1.1) is directly given the power supply of display system (2) and camera system, and battery supply (1.1) is also given processor (1.4) power supply through DC-DC (1.5) conversion back;
After the dynamic vision stimulating image that processor (1.4) is stored memorizer (1.10) passes through video coding (1.2), show by display system (2);
Camera system is obtained the eye movement analog video signal behind the dynamic vision stimulating image that is shown by display system (2), converts Y, Cr, Cb digital signal into by video decode, the video interface input processor (1.4) of treated device (1.4); Processor (1.4) outwards sends through wireless transport module (1.9) this digital signal compression back.
2. according to the said a kind of helmet-type wireless video eye movement appearance of claim 1, it is characterized in that: said display system (2) is made up of LED display and optical imaging system, and the light path that optical imaging system utilizes some lens assemblies to constitute is amplified LED display.
3. according to the said a kind of helmet-type wireless video eye movement appearance of claim 1, it is characterized in that: said camera system is made up of the photographic head infrared LED peripheral with being distributed in photographic head.
4. according to the said a kind of helmet-type wireless video eye movement appearance of claim 1, it is characterized in that: H.264 said processor (1.4) adopts during to digital Signal Compression that video compression standard compresses.
5. according to the said a kind of helmet-type wireless video eye movement appearance of claim 1, it is characterized in that: said processor (1.4) is provided with emulation interface (1.6), RS232 serial ports (1.7) and network interface (1.8).
6. according to claim 1 or 5 said a kind of helmet-type wireless video eye movement appearance; It is characterized in that: said core circuit plate (1) passes through wireless transport module (1.9) with wireless local net mode and computer system (5) exchange message, or passes through network interface (1.8) with cable LAN mode and computer system (5) exchange message.
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| CN108829246A (en) * | 2018-05-31 | 2018-11-16 | 歌尔股份有限公司 | Eyeball tracking function detecting method and system |
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Application publication date: 20120808 |