CN103456195A - Smart phone based remote question answering and tutoring system and using method thereof - Google Patents
Smart phone based remote question answering and tutoring system and using method thereof Download PDFInfo
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Abstract
The invention discloses a smart phone based remote question answering and tutoring system. A student client device is provided with a camera, so that an image scanning function can be realized; image processing software is installed in a student client device system and can automatically recognize and stitch scanned images, exercises needing scanning are accurately formed into a complete image, the image is transmitted to a teacher client device by the aid of a wireless network, both the client devices display respective scanned exercises simultaneously, a student and a teacher carry out synchronous whiteboard communication through handwriting touch screens, real-time interactive tutoring is really realized, problems of the student are answered at first time, real-time recording can be performed in the whole question answering process, and convenience is brought to the student to review in a highly targeted and impressive mode. The system is better in effect and more flexible in time and space as compared with traditional tutorial modes.
Description
Technical field
The present invention relates to the technical field of smart mobile phone, specifically a kind of long-range Tutor System based on smart mobile phone, can realize the exercise scanning imagery, the function of synchronous transmission and synchronous blank teaching.
Background technology
Students in middle and primary schools' instruction after class is one of them important means that improves student ability, specifically has: 1, participate in guidance bottom class course, listen teacher to explain example, it is unidirectional guidance communication often, 2, private tutor one to one, in set time, the academics and students carries out explanation guidance face-to-face, and the student actual do exercise and operation in, often can encounter a difficulty and have no way of doing it, now to need most teacher to explain targetedly, and guidance effect now is often best, impression is the most deep, but often now the student is that nobody can ask, network communication mode is very flourishing now, by some website, teach online, can be taught by network video telephone, but during long-distance video, teacher can't clearly see the exercise that needs answer clearly, therefore poor effect.System can not be carried in addition, also inconvenient.
The Sift algorithm was local feature description's that David Lowe proposed in 1999, and had carried out more deep development and improvement in 2004.The Sift Feature Correspondence Algorithm can be processed between two width images the matching problem in translation, rotation, affined transformation situation occurs, and has very strong matching capacity.On the whole, the Sift operator has following characteristic:
(1), the Sift feature is the local feature of image, and translation, rotation, yardstick convergent-divergent, brightness are changed, block with noise etc. and have good unchangeability, and visible change, affined transformation are also kept to stability to a certain degree.
(2), unique good, quantity of information is abundant, is applicable to mate fast and accurately in the magnanimity property data base.
(3), volume, even several objects of minority also can produce a large amount of Sift proper vectors.
(4), speed is relatively very fast, the Sift matching algorithm through optimizing even can reach real-time requirement.
(5), extensibility is strong, can with other forms of proper vector, be combined very easily.
Three large operations of its Sift algorithm are that (1) extracts key point; (2) key point is added to namely so-called describer of detailed information (local feature); (3) by the two side's unique points key point of proper vector (subsidiary upper) relatively find out in twos the some to unique point of mutual coupling, also just set up the corresponding relation between scenery.Extract key point and to key point additional detailed information (local feature) namely so-called describer can be called be the generation of Sift feature, from multiple image, extract yardstick convergent-divergent, rotation, brightness changed to irrelevant proper vector,
VoIP(Voice over Internet Protocol) be exactly by analoging sound signal (Voice) digitizing in brief, after digital compression, with the form of data packet (Data Packet), on IP data network (IP Network), do real-time transmission.Thereby realize voice bidirectional communication.The advantage of VoIP maximum is the environment that can adopt widely Internet and global ip interconnection, and the service more cheap than traditional business is provided.VoIP can be cheap on IP network the business such as transmission voice, fax, video and data, as storage forwarding of unified message, virtual telephony, virtual speech/fax mailbox, directory enquiry service, Internet call center, Internet call manager, video conference, ecommerce, fax storage forwarding and various information etc.
At present agreement commonly used as H.323, SIP, MEGACO and MGCP.H.323 be a kind of ITU-T standard, initial for the multimedia conferencing on Local Area Network, extended to afterwards and covered VoIP.This standard had both comprised that point-to-point communication had also comprised multipoint conference.H.323 defined four kinds of logic ingredients: terminal, gateway, pass keep and multipoint control unit (MCU).Terminal, gateway and MCU all are regarded as end point.Session Initiation Protocol is to set up the ietf standard that VOIP connects.SIP is a kind of application layer control protocol, for create, revise and stop session with one or more participants.The structure of SIP and HTTP(client-server agreement) similar.Client computer is sent request, and sends to server, after these requests of server process, to client computer, sends a response.This request forms affairs with response.Media Gateway Control Protocol is the VoIP agreement of being proposed by Cisco and Telcordia, and it has defined the communication service between Call Control Unit (Call Agent or media gateway) and telephony gateway.MGCP belongs to control protocol, allows central control board monitoring IP phone and gateway event, and notifies them to send content to assigned address.In the MGCP structure, intelligent call is controlled and is placed in the gateway outside and is processed by Call Control Unit (Call Agent).Call Control Unit keeps mutually synchronous simultaneously, sends consistent order to gateway.MGCP (Megaco) is IETF and ITU-T(ITU-TH.248 suggestion) result of making joint efforts.Megaco/H.248 is a kind of agreement of protocol element of the multimedia gateway physically separated for control, thereby can from media transform, separate calls control.Megaco/H.248 has illustrated for the change-over circuit switched voice to the media gateway (MG) of the communication flows based on bag with for the contact between the media getaway controller of the service logic of stipulating this flow.The data stream that Megaco/H.248 notice media gateway will come from outside packet or cell data network is connected on packet or data flow unit, as real-time host-host protocol (RTP).From the relation of VoIP structure and gateway control, Megaco/H.248 is quite similar in itself to MGCP, but Megaco/H.248 supports network widely, as ATM.
Summary of the invention
The object of the present invention is to provide a kind of long-range Tutor System based on smart mobile phone, it can realize the impart knowledge to students function of attached voice communication of exercise scanning imagery, image transmitting, synchronizing white, can realize the two places real-time interactive, overcome the shortcoming and defect existed in the prior art.
To achieve these goals, technical scheme of the present invention is: a kind of long-range Tutor System based on smart mobile phone, it is characterized in that: student client equipment and teacher's client device, it is characterized in that: in described student client equipment, be provided with camera, the sidepiece of student client equipment or bottom or top are provided with scanning window, above-mentioned camera is over against the scanning window setting, camera can carry out graph scanning by scanning window, and student client equipment and teacher's client device are realized exchanges data by wireless network.
A kind of using method of the long-range Tutor System based on smart mobile phone is characterized in that: described using method is as follows:
The camera 3 of I, use student client equipment 1 sees through scanning window 4, with the speed of 10 frames/second-60 frame/second, exercise is carried out to from left to right camera-shooting scanning;
II, pattern process module is used the SIFT merging algorithm for images to be spliced adjacent image, first find the pixel coordinate of the part that in two figure, content is consistent, again lap in two images is got rid of to repeating part, finally remainder is stitched together, so press camera time successively, all pictures are spliced successively, thereby obtain the job content that once from left to right scans out, if the height of the exercise of required scanning has surpassed the width of scanning window, can carry out repeatedly time scanning up and down, the concrete left edge started from exercise question for the first time, scanned from left to right the whole content width of exercise question upper part, then, scanning window moves back to the left edge that exercise question starts, / 3rd height and positions of the height just now be scanned from exercise question start to scan from left to right.The content of upper area 1/3rd height of so current scanning is the content that front was scanned.The image of this twice sweep has 1/3rd to be the same.So just can adopt equally the SIFT algorithm to do the Image Mosaics of secondary vertical direction.If twice sweep still can not be contained whole exercise question, same method continues Overlap-scanning, until scanned exercise question;
III, student client equipment by wireless network by the exercise content with the JPG image compression format, first to background server, inquire the registration ID of equipment on background server that teacher on duty uses, on the public network of WIFI, be specifically the IP address, if be exactly the address of a LAN (Local Area Network) on the network of operator.Send to teacher's client device, the intelligent machine that teacher's client can be common, installed the software that this patent is realized, after this software receives the exercise question image, after decompression, is presented on the display screen of machine.Faculty and Students can be on display screen separately the handwriting input thinking of solving a problem, or problem etc., the content of handwriting input is sent to opposite end by the network of having set up, and is presented on both sides' screen.With different color differentiatings.Realize the function of blank.The voice of the uppick of the content received that above the other side's blank, renewal shows in addition and process VOIP are synchronous.Concrete blank information and all add timestamp above voice messaging when adopting transmission.Take over party's playback is broadcasted simultaneously and shows according to timestamp;
IV, system make student client equipment and teacher's client device set up VOIP(Voice over Internet Protocol), carry out the communication of language, and the hand-written touch screen of both sides' mobile phone shows the exercise content of this scanning simultaneously, both sides can carry out the synchronizing white teaching by the hand-written touch screen of mobile phone.Carry out the two-way guidance teaching of sound blank.
The invention discloses a kind of long-range Tutor System based on smart mobile phone, its student client equipment is provided with a camera, can realize the image scanning function, carry image processing software in the student client device systems, can carry out to the image after scanning identification splicing automatically, need the most at last the exercise of scanning to generate accurately a complete picture, and utilize wireless network that picture is sent to teacher's client device, both sides' client device shows the exercise of this scanning simultaneously, both sides can carry out the synchronizing white communication by hand-written touch screen, really realize the guidance effect of real-time interactive, very first time answer student's a difficult problem, and the whole process of answering questions can be carried out real time record, facilitate the student to be reviewed, with strong points, with deep impression, compare traditional make-up lessons mode effect more, and more flexible on time and space.
The accompanying drawing explanation
Fig. 1 is system connection diagram of the present invention.
Fig. 2 is student client equipment one example structure schematic diagram of the present invention.
Fig. 3 is student client equipment two example structure schematic diagram of the present invention.
Fig. 4 is synchronizing white process flow diagram of the present invention.
Fig. 5 is left and right adjacent pattern splicing schematic diagram.
Fig. 6 is upper and lower twice sweep Image Mosaics schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The invention discloses a kind of long-range Tutor System based on smart mobile phone, it comprises student client equipment 1 and teacher's client device 2, it is different from prior art and is: in described student client equipment 1, be provided with camera 3, the sidepiece of student client equipment 1 or bottom or top are provided with scanning window 4, above-mentioned camera 3 arranges over against scanning window 4, camera 3 can carry out graph scanning by scanning window 4, and student client equipment 1 and teacher's client device 2 are realized exchanges data by wireless network.
In the specific implementation, in order to increase the space of interior of mobile phone circuit structure and battery, must reduce the setting position of camera, catoptron 5 is set in mobile phone, utilizes the dioptric imaging principle, reduce the setting position of camera, camera is arranged at catoptron one side, this catoptron can be plane mirror or cambered surface catoptron, and cambered surface can effectively increase reflective surface area, can be so that camera and catoptron are low first watch.
A kind of using method of the long-range Tutor System based on smart mobile phone, it is different from prior art and is: described using method is as follows:
The camera 3 of I, use student client equipment 1 sees through scanning window 4, with the speed of 10 frames/second-60 frame/second, exercise is carried out to from left to right camera-shooting scanning;
II, the pattern process module of student client equipment 1 is used the SIFT merging algorithm for images to be spliced adjacent image, first find the pixel coordinate of the part that in two figure, content is consistent, again lap in two images is got rid of, finally remainder is stitched together, so press camera time successively, all pictures are spliced successively, thereby obtain the job content that once from left to right scans out, if the height of the exercise of required scanning has surpassed the width of scanning window, can repeatedly scan up and down, the concrete left edge started from exercise question for the first time, scanned from left to right the whole content width of exercise question upper part, then, scanning window moves back to the left side that exercise question starts, / 3rd height and positions of the height just now be scanned from exercise question start to scan from left to right.The content of zone 1/3rd height of scanning is the content that front was scanned like this.The image of this twice sweep has 1/3rd to be the same.So just can adopt equally the SIFT algorithm to do the Image Mosaics of secondary vertical direction.If twice sweep still can not be contained whole exercise question, same method continues Overlap-scanning, until scanned exercise question;
III, student client equipment by wireless network by the exercise content with the JPG image compression format, first to background server, inquire the registration ID of equipment on background server that teacher on duty uses, on the public network of WIFI, be specifically the IP address, if be exactly the address of a LAN (Local Area Network) on the network of operator.Send to teacher's client device, the intelligent machine that teacher's client can be common, installed the software that this patent is realized, after this software receives the exercise question image, after decompression, is presented on the display screen of machine.Faculty and Students can be on display screen separately the handwriting input thinking of solving a problem, or problem etc., the content of handwriting input is sent to opposite end by the network of having set up, and is presented on screen.Realize the function of blank.The voice of the uppick of the content received that above the other side's blank, renewal shows in addition and process VOIP are synchronous.Concrete blank information and all add timestamp above voice messaging when adopting transmission.Take over party's playback is broadcasted simultaneously and shows according to timestamp;
IV, system make student client equipment 1 and teacher's client device 2 set up VOIP(Voice over Internet Protocol), and the hand-written touch screen of both sides' mobile phone shows the exercise content of this scanning simultaneously, both sides can carry out the synchronizing white teaching by the hand-written touch screen of mobile phone.
In the specific implementation, the synchronizing white teaching interface of the hand-written touch screen of described student client equipment 1 and teacher's client device 2 is provided with following function I and draws lines, II is cancelled one and is drawn lines, III replacement drawing board, IV sends word message, V page turning message, after individual event operates in the hand-written touch screen curtain and completes, carry out data encapsulation in client background, form the self-defining data bag, these packets are transported to and reach the other side's client by TCP/IP or UDP or RTP, the other side's client background is resolved the packet content of encapsulation again, and show item by item corresponding lines drafting at the hand-written touch screen of the other side's client.
In the specific implementation, drawing lines carries out synchronous operation and is set to the insert type for current lines, and give current lines and number, record current brush color, and encapsulate this information transmission line information to another client, the lines packaging information includes starting point, transfer point, end point, 1) starting point: obtain the coordinate axis of this point and affiliated lines numbering, this point is set for start type (expression starting point), and encapsulation sends this dot information to another client, 2) transfer point: obtain the coordinate axis of this point and affiliated lines numbering, this point is set for move type (expression transfer point), and encapsulation sends this dot information to another client, 3) end point: obtain the coordinate axis of this point and affiliated lines numbering, this some position stop type (expression end point) is set, and encapsulate this information and send to another client, this line information of another client also is saved in the HashMap numbering and is set to ReceiveId (expression is to receive the line style of type come), the brush color of synchronously coming is set, when receiving starting point, start to draw lines, when the drafting that finishes these lines that receives end point, while receiving transfer point, the coordinate axis that these lines advanced of painting.
In the specific implementation, cancel a lines synchronous operation for the last item lines of the current HashMap of being kept at are cancelled, and the numbering of the bar information of relocating reads, it is the delete type that this message is set, and send to other end client, if the numbering type that a synchronous termination is received is ReceiveId cancels local numbering of drawing at a synchronous end, if the numbering type that a synchronous termination is received is Id cancels and receive the lines numbering at a synchronous end.
In the specific implementation, repaint drawing board and be operating as current page drawing board emptied, and the information that is sent as the message of redraw type and this page number is carried out the drawing board replacement to synchronous end.
In the specific implementation, the transmission word message is operating as the current message body and is set to the txt type, and the word that encapsulation will send is to sync client.
In the specific implementation, page-turning synchronization is operating as the current message body and is set to feed, and synchronous number of pages is wanted in encapsulation.
In the specific implementation, described student client equipment 1 and teacher's client device 2 are the smart mobile phone with hand-written touch screen, and its underpart is provided with scanning window 4, and the camera in smart mobile phone is over against the scanning window setting.
In the specific implementation, be provided with camera in smart mobile phone, in the mobile phone of this first side of making a video recording, be provided with mirror lens, realize image projection.
In the specific implementation, the width of scanning window is in the 25mm left and right, vertical width of window is in the 8mm left and right, (thickness of mobile phone is generally less than 18mm now), if camera is with per second 30 frames shootings, and the speed of student's scanning is 100MM/ second (common people's sweep velocity at 50mm/ in second).Displacement between the image that every 2 frames photograph has 3.3mm, that that is to say that it is the same in two images of adjacent front and back, the content of (8-3.3)/8*%=59% being arranged, make SIFT Image Mosaics related algorithm for adjacent two images, find the pixel coordinate of the part that in two figure, content is consistent, again lap in two images is got rid of to the redundance part, different parts is stitched together, picture by the camera time priority splices successively like this, thereby obtain the job content that once from left to right scans out, if the height of exercise question has surpassed the width of scanning window, can repeatedly scan up and down, the rectangular content that each scan image splices is carried out the secondary image splicing again, thereby obtain whole than multline text or larger illustrated exercise question, this exercise question image, the wireless network by mobile phone is sent to the counselor place to mobile phone again, system makes both sides set up the VOIP voice call, both sides' mobile phone shows the exercise content of this scanning simultaneously, both sides can carry out the blank communication by the hand-written touch screen of mobile phone.The voice of the uppick of the content received that above the other side's blank, renewal shows and process VOIP are synchronous.Concrete blank information and all add timestamp above voice messaging when adopting transmission.Take over party's playback is broadcasted simultaneously and shows according to timestamp.
In Image Mosaics, job content stays white midway, two contents that the doubling of the image is partly perhaps same color in blank in front and back, adopt the method for speed computed image pre-estimating schedule, specific algorithm is first to find last two images that lap is arranged, calculate the displacement difference Δ L1 of stitching position by the sift algorithm, calculate again scanning two images that lap is arranged for the first time behind clear area, calculate the displacement difference Δ L2 of these two Image Mosaics positions by the sift algorithm, length between the clear area that (Δ L1+ Δ L2) ÷ 2 * n=should add in spliced map, n is for having passed through how many figure from the last figure that can calculate Δ L to the figure interscan that starts most to recover to calculate Δ L.
The art of this patent is not limited only to teaching field, also can be extended to other technical field, the bar code scan of kinds of goods for example, English Translation, teaching note figure crawl etc.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that the concrete enforcement of the present invention is confined to above-mentioned these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. the long-range Tutor System based on smart mobile phone, it comprises student client equipment (1) and teacher's client device (2), it is characterized in that: be provided with camera (3) in described student client equipment (1), the sidepiece of student client equipment (1) or bottom or top are provided with scanning window (4), above-mentioned camera (3) arranges over against scanning window (4), camera (3) can carry out graph scanning by scanning window (4), and student client equipment (1) and teacher's client device (2) are realized exchanges data by wireless network.
2. the using method of the long-range Tutor System based on smart mobile phone, it is characterized in that: described using method is as follows:
The camera (3) of I, use student client equipment (1) sees through scanning window (4), with the speed of 10 frames/second-60 frame/second, exercise is carried out to from left to right camera-shooting scanning;
II, the pattern process module of student client equipment (1) is used the SIFT merging algorithm for images to be spliced adjacent image, first find the pixel coordinate of the part that in two figure, content is consistent, again lap in two images is got rid of, finally different parts is stitched together, so press camera time successively, all pictures are spliced successively, thereby obtain the job content that once from left to right scans out, if the height of the exercise of required scanning has surpassed the width of scanning window, can repeatedly scan up and down, the concrete left edge started from exercise question for the first time, scanned from left to right the whole content width of exercise question upper part, then, scanning window moves back to the left side that exercise question starts, / 3rd height and positions of the height just now be scanned from exercise question start to scan from left to right, the content of zone 1/3rd height of scanning is the content that front was scanned like this, the image of this twice sweep has 1/3rd to be the same, so just can adopt equally the SIFT algorithm to do the Image Mosaics of secondary vertical direction, if twice sweep still can not be contained whole exercise question, same method continues Overlap-scanning, until scanned exercise question, in Image Mosaics, job content stays white midway, two contents that the doubling of the image is partly perhaps same color in blank in front and back, adopt the method for speed computed image pre-estimating schedule, specific algorithm is first to find last two images that lap is arranged, calculate the displacement difference Δ L1 of stitching position by the sift algorithm, calculate again scanning two images that lap is arranged for the first time behind clear area, calculate the displacement difference Δ L2 of these two Image Mosaics positions by the sift algorithm, length between the clear area that (Δ L1+ Δ L2) ÷ 2 * n=should add in spliced map, n is for having passed through how many figure from the last figure that can calculate Δ L to the figure interscan that starts most to recover to calculate Δ L,
III, student client equipment by wireless network by the exercise content with the JPG image compression format, first to background server, inquire the registration ID of equipment on background server that teacher on duty uses, it on the public network of WIFI, is specifically the IP address, if be exactly the address of a LAN (Local Area Network) on the network of operator, send to teacher's client device, teacher's client can be common intelligent machine, the software that this patent is realized has been installed, after changing software and receiving the exercise question image, after decompression, be presented on the display screen of machine, Faculty and Students can be on display screen separately the handwriting input thinking of solving a problem, or problem etc., the content of handwriting input is sent to opposite end by the network of having set up, be presented on screen, realize the function of blank, the voice of the uppick of the content received that above the other side's blank, renewal shows in addition and process VOIP are synchronous, concrete blank information and all add timestamp above voice messaging when adopting transmission, take over party's playback is broadcasted simultaneously and shows according to timestamp,
IV, system make student client equipment (1) and teacher's client device (2) set up VOIP(Voice over Internet Protocol), and the hand-written touch screen of both sides' mobile phone shows the exercise content of this scanning simultaneously, both sides can carry out the synchronizing white teaching by the hand-written touch screen of mobile phone.
3. the using method of a kind of long-range Tutor System based on smart mobile phone according to claim 2, it is characterized in that: the synchronizing white teaching interface of the hand-written touch screen of described student client equipment (1) and teacher's client device (2) is provided with following function I and draws lines, II is cancelled one and is drawn lines, III replacement drawing board, IV sends word message, V page turning message, after individual event operates in the hand-written touch screen curtain and completes, carry out data encapsulation in client background, form the self-defining data bag, these packets are transported to and reach the other side's client by TCP/IP or UDP or RTP, the other side's client background is resolved the packet content of encapsulation again, and show item by item corresponding lines drafting at the hand-written touch screen of the other side's client.
4. the using method of a kind of long-range Tutor System based on smart mobile phone according to claim 3, it is characterized in that: draw lines and carry out synchronous operation and be set to the insert type for current lines, and give current lines and number, record current brush color, and encapsulate this information transmission line information to another client, the lines packaging information includes starting point, transfer point, end point, 1) starting point: obtain the coordinate axis of this point and affiliated lines numbering, this point is set for start type (expression starting point), and encapsulation sends this dot information to another client, 2) transfer point: obtain the coordinate axis of this point and affiliated lines numbering, this point is set for move type (expression transfer point), and encapsulation sends this dot information to another client, 3) end point: obtain the coordinate axis of this point and affiliated lines numbering, this some position stop type (expression end point) is set, and encapsulate this information and send to another client, this line information of another client also is saved in the HashMap numbering and is set to ReceiveId (expression is to receive the line style of type come), the brush color of synchronously coming is set, when receiving starting point, start to draw lines, when the drafting that finishes these lines that receives end point, while receiving transfer point, the coordinate axis that these lines advanced of painting.
5. the using method of a kind of long-range Tutor System based on smart mobile phone according to claim 3, it is characterized in that: cancel a lines synchronous operation for the last item lines of the current HashMap of being kept at are cancelled, and the numbering of the bar information of relocating reads, it is the deletel type that this message is set, and send to other end client, if the numbering type that a synchronous termination is received is ReceiveId cancels local numbering of drawing at a synchronous end, if the numbering type that a synchronous termination is received is Id cancels and receive the lines numbering at a synchronous end.
6. the using method of a kind of long-range Tutor System based on smart mobile phone according to claim 3, it is characterized in that: repaint drawing board and be operating as current page drawing board emptied, and the information that is sent as the message of redraw type and this page number is carried out the drawing board replacement to synchronous end.
7. the using method of a kind of long-range Tutor System based on smart mobile phone according to claim 3 is characterized in that: send word message and be operating as the current message body and be set to the txt type, and the word that encapsulation will send is to sync client.
8. the using method of a kind of long-range Tutor System based on smart mobile phone according to claim 3, it is characterized in that: page-turning synchronization is operating as the current message body and is set to feed, and synchronous number of pages is wanted in encapsulation.
9. the using method of a kind of long-range Tutor System based on smart mobile phone according to claim 1 is characterized in that: described student client equipment (1) and teacher's client device (2) are the smart mobile phone with hand-written touch screen.
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