CN102222222A - Frame-skipping scanning and recognizing device and method - Google Patents
Frame-skipping scanning and recognizing device and method Download PDFInfo
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- CN102222222A CN102222222A CN2011101413510A CN201110141351A CN102222222A CN 102222222 A CN102222222 A CN 102222222A CN 2011101413510 A CN2011101413510 A CN 2011101413510A CN 201110141351 A CN201110141351 A CN 201110141351A CN 102222222 A CN102222222 A CN 102222222A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/14—Image acquisition
- G06V30/142—Image acquisition using hand-held instruments; Constructional details of the instruments
Abstract
The invention discloses a frame-skipping scanning and recognizing device and method, belonging to the field of computer peripheral equipment. The device comprises an optical sensor for taking images and a control module for processing the images and recognizing characters, wherein the optical sensor is used for continuously taking images of scanned characters so as to obtain an image frame sequence containing the scanned characters; the control module carries out downsampling on the image frame sequence according to scanning speed, the downsampled image frames are used as sampled frames, image frames not subjected to downsampling are used as skipping frames, the quantity of the skipping frames adjacent to the sampled frames is more than zero; and all the sampled frames obtained after downsampling are spliced, the character recognition and storage are carried out on a spliced panoramic image in sequence, and the character codes of the scanned characters are obtained. In the invention, image frames in the image frame sequence acquired by the optical sensor are screened through the control module, the obtained image frames to be spliced are spliced according to overlapping contents, and the splicing speed of the whole image frame sequence is improved.
Description
Technical field
The invention belongs to field of computer peripheral, relate to a kind of frame-skipping scanning recognition device and method, be specifically related to a kind of apparatus and method that scan the selected character string of identification.
Background technology
Electron scanning pen (abbreviation wand) is one of important application of OCR.The optics camera of wand is taken pictures to scanned document continuously according to certain frequency, obtains the sequence of image frames of scanned document, then sequence of image frames is spliced into to carry out OCR behind the width of cloth panoramic picture and handle.
Raising along with hardware technology, in order to improve the sweep velocity peak value that wand is supported, improve user's use experience, the sample frequency of the optical sensor that wand uses is more and more higher, such as per second gather 120 picture frames or even higher, when the optical sensor sample frequency of wand improved, than lower sample frequency, the one or more picture frames before current image frame under the same scan speed and its former frame had the probability of certain overlapping content higher.
CN1160657C discloses a kind of records method and apparatus, this installs inswept this character string, optical sensor is by means of an overlapping image of a plurality of its content parts of dimension sensor synchronous recording, these image levels, vertically be combined into a width of cloth panoramic picture, and will be stored in the device after the character recognition in the panoramic picture.But the signaling control unit that should invent can only vertically and flatly make up each picture frame and previous picture frame by overlapping content, the picture frame that per like this two frames are adjacent just must make up, when the sampling rate of wand is too high, the overlapping ratio of the content of adjacent two picture frames is just very big, the all images frame that signaling control unit just there is no need optical sensor is collected all carries out image mosaic in the mode of combination in twos, the load of control module is increased the weight of greatly, take hardware resource, and reduced the splicing speed of entire image frame sequence.
Summary of the invention
Technical matters to be solved by this invention is for providing a kind of frame-skipping scanning recognition device and method, by the picture frame in the sequence of image frames that collects is carried out down-sampling, the picture frame to be spliced that obtains is spliced, improved the splicing speed of entire image frame sequence.
The invention discloses a kind of frame-skipping scanning recognition device, comprise optical sensor that is used for photographic images and the control module that is used for Flame Image Process and identification character, optical sensor is taken to obtain containing the sequence of image frames of scanned character continuously to scanned character, and two picture frame content parts of a frame are overlapping at interval in the described sequence of image frames; Control module is carried out down-sampling according to sweep velocity to sequence of image frames, will be by the picture frame of down-sampling as sample frame, not by the picture frame of down-sampling as skipped frame, the quantity of the skipped frame adjacent with described sample frame is greater than 0; Each sample frame that obtains behind the down-sampling is spliced, and the panoramic picture that splicing is obtained carries out storing after the character recognition, obtains the character code of scanned character.
Described control module comprises:
Concatenation unit calculates the concatenation information of second sample frame and first sample frame, according to concatenation information second sample frame and first sample frame is spliced, and then second sample frame is updated to first sample frame; Described concatenation information comprises stitching direction, level splicing displacement and vertically splices displacement;
Sampling unit calculates the sampling rate of down-sampling next time according to the minimum overlay rate of concatenation information and setting, obtains second sample frame, returns concatenation unit; All images frame down-sampling finishes in sequence of image frames.
The invention also discloses a kind of frame-skipping scanning recognition methods, comprise the steps:
In the described step 2, as first sample frame, sampling rate is 1/2nd with first two field picture in the sequence of image frames, and promptly skipping frame number is 1, and the picture frame after the skipped frame is second sample frame.
Described step 2 comprises:
Step a calculates the concatenation information of second sample frame and first sample frame, according to concatenation information second sample frame and first sample frame is spliced, and then second sample frame is updated to first sample frame; Described concatenation information comprises stitching direction, level splicing displacement and vertically splices displacement;
Step b calculates the sampling rate of down-sampling next time according to the minimum overlay rate of concatenation information and setting, obtains second sample frame, returns step a; All images frame down-sampling finishes in sequence of image frames.
Described step 2 also comprises end-frame image in the sequence of image frames as second sample frame.
Described concatenation information comprises stitching direction, level splicing displacement and vertically splices displacement.
The panoramic picture that slant correction obtains before the described character recognition makes each character in the panoramic picture form the horizontal text row.
A kind of frame-skipping scanning recognition device disclosed by the invention and method, picture frame in the sequence of image frames that optical sensor is collected by control module screens, splice according to the overlapping content in the picture frame to be spliced that obtains, improved the splicing speed of entire image frame sequence.
Description of drawings
Fig. 1 is the synoptic diagram of frame-skipping scanning recognition device of the present invention;
Fig. 2 is the structured flowchart of frame-skipping scanning recognition device of the present invention;
Fig. 3 is the process flow diagram of frame-skipping scanning recognition methods of the present invention;
Fig. 4 is the process flow diagram of step 2 in the frame-skipping scanning recognition methods of the present invention;
Fig. 5 is the synoptic diagram of sample frame and skipped frame in the frame-skipping scanning recognition methods of the present invention;
Fig. 6 is the synoptic diagram of each picture frame and related data among the frame-skipping scanning recognition methods embodiment of the present invention;
Fig. 7 is panorama bianry image among the embodiment of frame-skipping scanning recognition methods of the present invention;
Fig. 8 is the panorama bianry image of the embodiment medium dip of frame-skipping of the present invention scanning recognition methods after proofreading and correct.
Among the figure: 1, housing 2, control module 3, circuit board 4, battery 5, optical sensor
6, button 7, storer 8, liquid crystal display 9, USB module 10, display unit 11, TTS module
12, lens group 13, lighting unit
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtained belongs to the scope of protection of the invention.
The invention discloses a kind of frame-skipping scanning recognition device, as Fig. 1, shown in Figure 2, comprise following assembly: be used to encapsulate the also housing 1 of fixing device component, the control module 2 that is used for the identification of Flame Image Process and literal, the circuit board 3 that is used for integrated package, be used to the battery 4 of each assembly power supply of device, be used to make the optical sensor 5 of character imaging, the button 6 that is used for the triggering collection operation, be used to load the storer 7 of character recognition engine, be used to show the liquid crystal display 8 of output information, be used to connect the USB module 9 of computing machine, the TTS module 11 that is used to drive the display unit 10 of liquid crystal display 8 and is used to export voice.Circuit board 3 integrated optical sensors 5, storer 7, control module 2, display unit 10, TTS module 11 and USB module 9.Housing 1 encapsulated liquid crystal screen 8, battery 4, button 6 and circuit board 3.Button 6 is connected with optical sensor 5 on the circuit board 3, and control signal is sent to optical sensor 5.5 pairs of scanned characters of optical sensor carry out continuous high speed to be taken to obtain containing the sequence of image frames of scanned character, and two picture frame content parts of a frame are overlapping at interval in the described sequence of image frames; Control module 2 is carried out down-sampling according to sweep velocity to sequence of image frames, will be by the picture frame of down-sampling as sample frame, not by the picture frame of down-sampling as skipped frame, each sample frame that obtains behind the down-sampling is spliced, to the laggard line character identification of panoramic picture slant correction that splicing obtains, obtain the character code of scanned character.
As shown in Figure 2, circuit board 3 integrated control modules 2, storer 7, optical sensor 5, display unit 10, TTS module 11 and USB module 9.Control module 2 is connected storage 7, optical sensor 5, display unit 10 and TTS module 11 respectively.Under the control of control module 2, the user triggers by button 6, control signal is sent to optical sensor 5, optical sensor 5 carries out the image information collection, obtain sequence of image frames, control module 2 is carried out down-sampling according to sweep velocity to sequence of image frames, will be by the picture frame of down-sampling as sample frame, not by the picture frame of down-sampling as skipped frame, each sample frame that obtains behind the down-sampling is spliced, the recognition engine of calling in the storer 7 behind the panoramic picture slant correction that splicing is obtained is carried out character recognition, and the character code that will discern the scanned character that the back forms is stored in storer 7.Display unit 10 can call and be stored in the character to be scanned that identifies in the storer 7 and show on liquid crystal display 8, and control module 2 can send to TTS module 11 with the character code of scanned character according to control signal, by TTS module 11 output voice.
As shown in Figure 1, the present invention also comprises, is used for the lens group 12 of pickup image information; The lighting unit 13 of character to be scanned is used to throw light on.The focal length of described lens group 12 is 5 to 7mm, and aperture is more than 10, has guaranteed that the depth of field that lens group 12 reaches is 30 to 50mm, can effectively Word message be scanned, and has guaranteed good effect.When the user is scanned, lighting unit 13 is in opening, lighting unit 13 sends light beam and form hot spot on scanned character, lens group 12 is absorbed the image information of lighting unit 13 location on the optical sensor 5 that is integrated on the circuit board 3 simultaneously, 5 pairs of scanned characters of optical sensor are taken continuously, obtain containing the sequence of image frames of scanned character, two picture frame content parts of a frame are overlapping at interval in the described sequence of image frames; Control module is carried out down-sampling according to sweep velocity to sequence of image frames, will be by the picture frame of down-sampling as sample frame, not by the picture frame of down-sampling as skipped frame, each sample frame that obtains behind the down-sampling is spliced, the laggard line character identification of the panoramic picture slant correction that splicing is obtained obtains the character code of scanned character and stores in the storer 7.
The invention also discloses a kind of frame-skipping scanning recognition methods, as shown in Figure 3, comprise the steps:
When adopting device of the present invention to select scanned character, control module 2 sends to optical sensor 5 with control signal, when selecting scanned character, optical sensor 5 is taken continuously to the scanned character in the page of text synchronously, to obtain containing the sequence of image frames of scanned character.Because the sampling rate of optical sensor 5 reached for 120 frame/seconds, so in the sequence of image frames that optical sensor 5 collects, the content part of two picture frames of a frame is overlapping at interval.
As shown in Figure 4, step 2 comprises the steps:
Step a calculates the concatenation information of second sample frame and first sample frame, according to concatenation information second sample frame and first sample frame is spliced, and then second sample frame is updated to first sample frame; Described concatenation information comprises stitching direction, level splicing displacement and vertically splices displacement;
First frame to sequence of image frames carries out special processing, and the Frame Properties that is about to first frame of sequence of image frames is made as sample frame.In the present embodiment, picture frame sequence number as shown in Figure 6 is that 1 picture frame is first frame of sequence of image frames in the present embodiment.As first sample frame, sampling rate is 1/2nd with first two field picture in the sequence of image frames, and promptly skipping frame number is 1, and the picture frame after the skipped frame is second sample frame.
In the present embodiment, as shown in Figure 6, with first two field picture in the sequence of image frames, be that sequence number is that 1 picture frame is as first sample frame, sampling rate is 1/2nd, promptly skipping frame number is 1, then be that 2 picture frame is skipped with sequence number, with sequence number is that 3 second sample frame and sequence number are that 1 first sample frame is mated, calculate both concatenation information, comprise level splicing displacement Vx, vertically splice displacement Vy and stitching direction, obtaining level splicing displacement Vx is 2, and vertically splicing displacement Vy is 1, and stitching direction is the bottom right, is that 3 second sample frame and sequence number are that 1 first sample frame is spliced according to the concatenation information that obtains with sequence number, and is that 3 second sample frame is updated to first sample frame with sequence number.
Step b calculates the sampling rate of down-sampling next time according to the minimum overlay rate of concatenation information and setting, obtains second sample frame, returns step a; All images frame down-sampling finishes in sequence of image frames.
Except that first three frame was used as initialization, residual image frames was divided into skipped frame and sample frame in the entire image frame sequence that wand obtains.As shown in Figure 5, its first frame is first sample frame, the skipped frame corresponding with first sample frame, and the number of skipped frame is determined according to the concatenation information of sample frame correspondence and the minimum overlay rate of setting, can be 1, also can be multiframe.
Relevant each picture frame specifically comprises picture frame sequence number, picture frame, Duplication, level splicing displacement, vertically splices displacement, stitching direction and Frame Properties as shown in Figure 6 in the present embodiment.Wherein, Duplication is the ratio of total pixel number in overlapping number of pixel between a current sample frame and the last sample frame and the sample frame, when Duplication is too small, splice the accuracy variation even can cause the splicing failure, stitching direction has four values, be respectively bottom right, upper right, lower-left, upper left, Frame Properties has two values, is respectively sample frame and skipped frame.In the present embodiment, the size of each picture frame is 120 * 80, and the down-sampling frequency was 120 frame/seconds.In the present embodiment, be convenient narration, the picture frame sequence number is that the picture frame of X is called the X picture frame.
In the present embodiment, suppose that wand makes uniform motion in the minor time slice that with the current time is the center, the speed of wand may have certain variation in the reality in this time period, but does not influence the calculating validity of this hypothesis.The computing method of the skipped frame number of each sample frame correspondence are as follows:
If the number of the skipped frame of current sample frame correspondence is n, the skipped frame number of a last sample frame correspondence of current sample frame is t, current sample frame is with respect to the level splicing displacement Vx of a last sample frame of current sample frame, because the hypothesis wand is made uniform motion, then current sample frame with respect to the level splicing displacement of its previous image frame is
In like manner, current sample frame with respect to the vertical splicing displacement of its previous image frame is
The height of each picture frame is H, and width is W, and the minimum overlay rate is T, then has:
In formula, because
Be expressed as of previous image frame the displacement on directions X of current sample frame, and wand makes uniform motion, then with respect to current sample frame next-door neighbour
Represent next sample frame and the relative displacement of current sample frame on directions X of current sample frame,
Next sample frame and the overlap length of current sample frame on directions X of promptly representing current sample frame, in like manner,
Next sample frame and the overlapping height of current sample frame on the Y direction of representing current sample frame,
Then represent next sample frame of current sample frame and the overlapping area of current sample frame,
Be that the Duplication of next sample frame of current sample frame and current sample frame is during greater than the minimum overlay rate, the number n of corresponding skipped frame between next sample frame that can obtain current sample frame and the current sample frame, for the existence that guarantees skipped frame does not reduce the splicing accuracy, the skipped frame number of current sample frame correspondence can not be too much, in the present embodiment, establish skipped frame number n on be limited to 3.
In the present embodiment, minimum overlay rate T is 0.5, and the size of picture frame is the 120 * 80, the 3rd picture frame be 2, the 3 picture frames with respect to the vertical splicing displacement Vy of the 1st picture frame with respect to the level splicing displacement Vx of the 1st picture frame is 0, then basis
Calculate Integer n and be about 39, greater than the upper limit 3 of the number of skipped frame, then get n=3, corresponding sampling rate is 1/4, then gets the 7th picture frame as second sample frame; Return step a.
With sequence number is that 7 second sample frame and sequence number are that 3 first sample frame is mated, calculate both concatenation information, the level splicing displacement Vx that obtains two picture frames is 4, vertically splicing displacement Vy is 1, stitching direction is the bottom right, is that 7 second sample frame and sequence number are that 3 first sample frame is spliced according to the concatenation information that obtains with sequence number, and is that 7 second sample frame is updated to first sample frame with sequence number.
Because minimum overlay rate T is 0.5, sequence number is that the skipped frame number t of 7 the first sample frame correspondence is 3, and the size of picture frame is the 120 * 80, the 7th picture frame with respect to the level splicing displacement Vx of the 3rd picture frame is 4, the 7th picture frame is 1 with respect to the vertical splicing displacement Vy of the 3rd picture frame, then basis
Calculate Integer n and be about 35, greater than the upper limit 3 of the number of skipped frame, then get n=3, corresponding sampling rate is 1/4, is initial with the 11st picture frame then, gets the 11st picture frame as second sample frame; Return step a, with sequence number is that 11 second sample frame and sequence number are that 7 first sample frame is spliced, and the like, when sequence number is that the skipped frame number t of 120 the first sample frame correspondence is when being 3, the 120th picture frame splices with the 116th picture frame, is 44 because the size of picture frame is the 120 * 80, the 120th picture frame with respect to the level splicing displacement Vx of the 116th picture frame, the 120th picture frame is 2 with respect to the vertical splicing displacement Vy of the 116th picture frame, then basis
Calculate Integer n and be about 2, less than the upper limit 3 of the number of skipped frame, then get n=2, corresponding sampling rate is 1/3, then gets the 123rd picture frame as second sample frame; Return step a, with sequence number is that 123 second sample frame and sequence number are that 120 first sample frame is spliced, so handle, calculate with the mode of iteration number skipped frame, and the sample frame that calculates spliced, all images frame down-sampling finishes in sequence of image frames, can obtain panoramic picture, in the present embodiment, the panorama bianry image that finally obtains as shown in Figure 7.
The character recognition engine that control module is called in the storer is discerned the panoramic picture that splicing obtains, the panoramic picture that at first splicing was obtained before character recognition carries out slant correction, as shown in Figure 8, discern calling character recognition engine again behind each character formation horizontal text row in the panoramic picture, obtain the character code of scanned character.The character code of the scanned character that the identification back forms is stored in storer.Display unit can call and be stored in the character to be scanned that identifies in the storer and show on liquid crystal display, and control module can send to the TTS module with the character code of scanned character according to control signal, by TTS module output voice.
The invention discloses a kind of frame-skipping scanning recognition device and method, the sequence of image frames that obtains at wand splices.Picture frame in the sequence of image frames that the present invention collects optical sensor by control module carries out down-sampling, and the overlapping content in the picture frame to be spliced that obtains is spliced, and has improved the splicing speed of entire image frame sequence.
More than to a kind of frame-skipping scanning recognition device provided by the present invention and method, be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change.In sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. a frame-skipping scans recognition device, comprise optical sensor that is used for photographic images and the control module that is used for Flame Image Process and identification character, it is characterized in that: optical sensor is taken to obtain containing the sequence of image frames of scanned character continuously to scanned character, and two picture frame content parts of a frame are overlapping at interval in the described sequence of image frames; Control module is carried out down-sampling according to sweep velocity to sequence of image frames, will be by the picture frame of down-sampling as sample frame, not by the picture frame of down-sampling as skipped frame, the quantity of the skipped frame adjacent with described sample frame is greater than 0; Each sample frame that obtains behind the down-sampling is spliced, and the panoramic picture that splicing is obtained carries out storing after the character recognition, obtains the character code of scanned character.
2. device according to claim 1 is characterized in that: also comprise lighting unit, character to be scanned is used to throw light on.
3. device according to claim 1 is characterized in that: described control module comprises:
Concatenation unit calculates the concatenation information of second sample frame and first sample frame, according to concatenation information second sample frame and first sample frame is spliced, and then second sample frame is updated to first sample frame; Described concatenation information comprises stitching direction, level splicing displacement and vertically splices displacement;
Sampling unit calculates the sampling rate of down-sampling next time according to the minimum overlay rate of concatenation information and setting, obtains second sample frame, returns concatenation unit; All images frame down-sampling finishes in sequence of image frames.
4. according to claim 1 or 3 described devices, it is characterized in that: also comprise display unit, be used to show the character to be scanned that identifies.
5. a frame-skipping scanning recognition methods that is applied to the described device of claim 1 is characterized in that, comprises the steps:
Step 1 is taken to obtain containing the sequence of image frames of scanned character continuously to scanned character, and two picture frame content parts of a frame are overlapping at interval in the described sequence of image frames;
Step 2, control module in the device is carried out down-sampling according to sweep velocity to sequence of image frames, will be by the picture frame of down-sampling as sample frame, not by the picture frame of down-sampling as skipped frame, the quantity of the skipped frame adjacent with described sample frame is spliced each sample frame that obtains behind the down-sampling greater than 0;
Step 3, the panoramic picture that splicing is obtained carries out storing after the character recognition, obtains the character code of scanned character.
6. method according to claim 5 is characterized in that, and is described when scanned character is taken synchronously, adopts lighting unit that scanned character is thrown light on.
7. according to claim 5 or 6 described methods, it is characterized in that in the described step 2, as first sample frame, sampling rate is 1/2nd with first two field picture in the sequence of image frames, promptly skipping frame number is 1, and the picture frame after the skipped frame is second sample frame.
8. method according to claim 5 is characterized in that, described step 2 comprises:
Step a calculates the concatenation information of second sample frame and first sample frame, according to concatenation information second sample frame and first sample frame is spliced, and then second sample frame is updated to first sample frame; Described concatenation information comprises stitching direction, level splicing displacement and vertically splices displacement;
Step b calculates the sampling rate of down-sampling next time according to the minimum overlay rate of concatenation information and setting, obtains second sample frame, returns step a; All images frame down-sampling finishes in sequence of image frames.
9. method according to claim 8 is characterized in that: described step 2 also comprises, with end-frame image in the sequence of image frames as second sample frame.
10. method according to claim 8 is characterized in that: described concatenation information comprises stitching direction, level splicing displacement and vertically splices displacement.
11. method according to claim 5 is characterized in that: the panoramic picture that slant correction obtains before the described character recognition makes each character in the panoramic picture form the horizontal text row.
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| CN2011101413510A CN102222222A (en) | 2011-05-27 | 2011-05-27 | Frame-skipping scanning and recognizing device and method |
| PCT/CN2012/071518 WO2012163112A1 (en) | 2011-05-27 | 2012-02-23 | Frame-skipping scanning and recognizing device and method |
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| CN111950463A (en) * | 2020-08-13 | 2020-11-17 | 安徽淘云科技有限公司 | Scanning method, scanning device, scanning pen and storage medium |
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| CN106204420B (en) * | 2016-06-29 | 2019-01-29 | 深圳市优象计算技术有限公司 | A kind of pen type image scanning joining method and device |
| CN107147624B (en) * | 2017-04-24 | 2019-11-22 | 珠海全志科技股份有限公司 | Panoramic picture processing method, display device and playback equipment |
| CN111950463A (en) * | 2020-08-13 | 2020-11-17 | 安徽淘云科技有限公司 | Scanning method, scanning device, scanning pen and storage medium |
| CN112383671A (en) * | 2020-11-03 | 2021-02-19 | 安徽淘云科技有限公司 | Scanning method, scanning device, scanning pen and storage medium |
| CN112383671B (en) * | 2020-11-03 | 2022-10-04 | 安徽淘云科技股份有限公司 | Scanning method, scanning device, scanning pen and storage medium |
| CN114429636A (en) * | 2022-04-06 | 2022-05-03 | 中国科学院自动化研究所 | Image scanning identification method and device and electronic equipment |
| CN114429636B (en) * | 2022-04-06 | 2022-07-12 | 中国科学院自动化研究所 | Image scanning identification method and device and electronic equipment |
| CN117424968A (en) * | 2023-12-15 | 2024-01-19 | 深圳市贝铂智能科技有限公司 | Intelligent scanning data safety transmission method and device and intelligent scanning pen |
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| WO2012163112A1 (en) | 2012-12-06 |
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