CN102063611A - Method and system for inputting characters - Google Patents
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- CN102063611A CN102063611A CN2010100344788A CN201010034478A CN102063611A CN 102063611 A CN102063611 A CN 102063611A CN 2010100344788 A CN2010100344788 A CN 2010100344788A CN 201010034478 A CN201010034478 A CN 201010034478A CN 102063611 A CN102063611 A CN 102063611A
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- 238000006243 chemical reaction Methods 0.000 claims description 11
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- 230000009182 swimming Effects 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000002372 labelling Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims description 2
- 238000012015 optical character recognition Methods 0.000 abstract description 18
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Abstract
The invention provides a method and a system for inputting characters, and belongs to the technical field of processing of electric data. The method comprises the following steps of: acquiring a two-dimensional image of characters on a scanned medium by an image collector; transmitting the acquired two-dimensional image to a data processing unit by using a universal serial bus (USB) interface in real time; performing binary processing on the two-dimensional image by the data processing unit to acquire a binary image; splicing the two-dimensional image in real time on the basis of image registration by the data processing unit to acquire a panoramic binary image of the characters on the scanned medium; correcting the panoramic binary image by the data processing unit; extracting a character line to be identified from the panoramic binary image by the data processing unit; and performing optical character recognition (OCR) on the characters to be identified and displaying by the data processing unit. The method and the system improve the image processing speed, scanning speed of a scanning pen and the entering speed.
Description
Technical field
The invention belongs to electric technical field of data processing, particularly a kind of character input method.
Background technology
Current, computer input method mainly contains types such as five-stroke input method, spelling input method, hand-writing input method.When we carry out Data acquisition,, often need be in computing machine with the words input in a large amount of paper documents, if carry out typing by above-mentioned several input methods, time-consuming effort again.By optical character identification (OCR, Optical Character Recognition) technology, the literal of needs is taken to image, then image is discerned, can realize quick typing.
But there is the slower defective of sweep velocity, input speed of image processing speed, wand in prior art.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of improved computer scanning input method at the defective of prior art existence, realizes the quick typing of document information.
For solving the problems of the technologies described above, the invention provides a kind of character input method, this character input method may further comprise the steps:
S101: obtain the two dimensional image that is scanned literal on the medium by image acquisition device;
S102: the described two dimensional image that will obtain carries out subsequent treatment by the USB interface real-time Transmission to data processing unit;
S103: described two dimensional image is carried out binary conversion treatment, obtain bianry image;
S104: based on image registration described bianry image is spliced in real time, obtain to be scanned the panorama bianry image of literal on the medium;
S105: the panorama bianry image is proofreaied and correct;
S106: by extracting literal line to be identified in the panorama bianry image after the described correction;
S107: described literal line to be identified is carried out OCR identification and demonstration.
Preferably, among the described step S103, described two dimensional image is carried out binary conversion treatment by the adaptive threshold binary processing method.
Preferably, the image registration among the described step S104 is that the displacement relation between adjacent two two field pictures is realized before and after calculating by the overlapping region of mating adjacent image interframe in the described bianry image.
Preferably, also comprise before the described step S105: judge whether the panorama bianry image exists the white with black word image, if then discern described white with black word image and carry out inverse; Otherwise, direct execution in step S105.
Preferably, among the described step S105, blacken the name of disposal route by the segmentation distance of swimming correction of the literal line in the described panorama bianry image is horizontality.
Describedly blacken the name of disposal route by the segmentation distance of swimming and the literal line in the described panorama bianry image is proofreaied and correct to horizontality comprised:
Merge the literal line that obtains in the described panorama bianry image by connected component labeling;
From described literal line, select delegation as the correction reference literal line;
Blacken the name of method by the segmentation distance of swimming and obtain blackening the name of the benchmark literal line;
By the described benchmark literal line of blackening the name of is sampled and is calculated the buckling curve of literal line;
According to described buckling curve described panorama bianry image being proofreaied and correct is horizontality.
Preferably, among the described step S106, obtain a plurality of complete literal line in the panorama bianry image after the described correction by horizontal projection, and according to described a plurality of complete literal lines separately positional information identification and extract literal line to be identified.
Preferably, described step S101 is specially: obtain the two dimensional image that is scanned literal on the medium by wand.
The present invention also provides a kind of character input system, and this literal input system comprises:
Image acquisition device is gathered the two dimensional image for the treatment of input characters;
The USB transmitter sends described two dimensional image to image processor;
Image processor successively carries out binary conversion treatment, splices in real time, proofreaies and correct and extracts literal line to be identified the two dimensional image from described USB transmitter;
The OCR recognizer carries out OCR identification and demonstration to described literal line to be identified;
Controller is controlled described image acquisition device, USB transmitter, image processor and OCR recognizer execution operation separately.
Preferably, described image acquisition device is a wand.
Compared with prior art, the advantage of technical solution of the present invention is: the two dimensional image by literal that image acquisition device is obtained is real-time transmitted in the graphics processing unit, carry out processing such as binaryzation, registration, splicing, correction and identification by graphics processing unit, and image registration wherein is based on, and bianry image carries out, like this, image processing speed, the sweep velocity of wand, input speed have been improved.
Description of drawings
Fig. 1 is the process flow diagram according to character input method of the present invention;
Fig. 2 is the two dimensional image that obtains by wand according among the embodiment of character input method of the present invention;
Fig. 3 carries out the bianry image that obtains after the binary conversion treatment to two dimensional image among Fig. 2;
Fig. 4 splices the panorama bianry image that the back obtains in real time to the bianry image among Fig. 3;
Fig. 5 is by the result after the panorama bianry image is proofreaied and correct among Fig. 4;
Fig. 6 is the literal line to be identified that extracts by in the panorama bianry image after proofreading and correct among Fig. 5;
Fig. 7 is the structural representation according to character input system of the present invention.
Embodiment
The character input method that the present invention proposes is described as follows in conjunction with the accompanying drawings and embodiments.
Character input method provided by the invention comprises following steps:
Image acquisition: utilize the image acquisition device images acquired; Particularly, described image acquisition device can be wand, promptly utilizes the photoinduction sensor of wand to obtain the two dimensional image that is scanned literal.Wand has a photoinduction sensor that has optical lens, and such as ccd sensor, it can write down gray scale or color 2 D image.By wand, can obtain the consecutive image sequence that is scanned literal on the medium, and adjacent image interframe has certain overlapping.
The image transmission: the two dimensional image that image acquisition step is obtained is real-time transmitted in the data processing unit by USB interface.The data processing unit of present embodiment is a computing machine.Particularly, connect by USB interface between image acquisition device and the computing machine, make the two dimensional image that obtains be real-time transmitted in the computing machine by USB interface.
Flame Image Process: in computing machine, carry out image binaryzation earlier, utilize the overlapping region of adjacent image interframe to carry out image mosaic then, after finishing, splicing obtains being scanned the panorama bianry image of literal, the panorama bianry image is proofreaied and correct, extracted literal line to be identified the panorama bianry image after proofreading and correct.
Particularly, in computing machine, the scan image that receives is handled in real time: at first, image is carried out the adaptive threshold binary conversion treatment, obtain the bianry image of two dimensional image; Then bianry image is spliced, the core of bianry image splicing is to carry out image registration, promptly calculate of the displacement of back one two field picture with respect to the former frame image by the coupling overlapping region, at bianry image, available 0 expression background pixel value, represent the foreground pixel value with 1, the present invention proposes index---the registration coefficient of a tolerance bianry image similarity, promptly in the overlapping region all pixels ask after the AND operation add and value and overlapping region in all pixels ask adding and the ratio of value after the inclusive-OR operation.The molecular moiety of registration coefficient is the form of image related function, can adopt FFT to carry out speed-up computation, the denominator part of registration coefficient can adopt integrogram to carry out speed-up computation, is that image registration is carried out on the basis with this index, after obtaining registration position, just can realize image mosaic.After single pass finished, image mosaic also finished, and obtains the panorama bianry image of scan text.The panorama bianry image may be a white gravoply, with black engraved characters, also may be the black matrix wrongly written or mispronounced character, for the situation of black matrix wrongly written or mispronounced character, need carry out inverse and handle; Literal line in the panorama bianry image is not a level generally, has flexural deformation, it need be corrected into horizontality; Except that literal line to be identified, may also comprise some invalid literal lines in the panorama bianry image after the correction, therefore literal line to be identified need be extracted, literal line to be identified generally is positioned at the close position intermediate of multirow literal, can extract in view of the above.
Literal identification: literal line to be identified is sent into the OCR module discern.
Particularly, in computing machine, literal line to be identified is carried out OCR identification.
To enumerate a specific embodiment below character input method of the present invention will be further elaborated, as shown in Figure 1.
At first wand is linked to each other with computing machine by USB interface, and the scan process software in the startup calculating, carry out following steps then:
S101: obtain the two dimensional image that is scanned literal on the medium by wand.
Particularly, wand is attached to is scanned on the medium, allow literal line to be identified be positioned at the central authorities of wand acquisition window as far as possible, drag wand according to certain orientation then and carry out image acquisition, wand obtains image according to certain frequency.In the present embodiment, frequency was 120 frame/seconds, promptly obtained 120 two field pictures in the per second; Be illustrated in figure 2 as the two dimensional image that present embodiment obtains by wand.
S102: the described two dimensional image that will obtain is real-time transmitted in the computing machine by USB interface; The two dimensional image that wand obtains is real-time transmitted in the computing machine via USB interface; Computing machine can be notebook, personal desktop machine, also can be server.
S103: described two dimensional image is carried out binary conversion treatment, obtain bianry image; In the present embodiment, adopt OTSU adaptive threshold binaryzation algorithm that image is carried out binaryzation.Be illustrated in figure 3 as two dimensional image among Fig. 2 is carried out the bianry image that obtains after the binary conversion treatment.
S104: based on image registration described bianry image is spliced in real time, obtain to be scanned the panorama bianry image of literal on the medium; Described image registration is that the relative displacement relation of adjacent two two field pictures realizes before and after calculating by the coupling overlapping region.
Particularly, because bianry image can be represented background pixel value with 0, represent the foreground pixel value with 1, with all pixels in the overlapping region ask after the AND operation add and value and overlapping region in all pixels ask after the inclusive-OR operation add and the ratio of value as the metric of overlapping region similarity, and according to this tolerance by the pixel search to obtain the optimal registration position; After obtaining the optimal registration position, only need the Non-overlapping Domain in the former frame image in the adjacent image frame is noted; Since first two field picture, the non-overlapped part in the former frame image in adjacent two two field pictures is spliced in the panorama bianry image goes, carry out so successively, to the last a two field picture; A two field picture place in the end owing to there has not been successive image thereafter, goes so it all is spliced in the panorama bianry image.After splicing is finished, obtain being scanned the panorama bianry image of literal; Be illustrated in figure 4 as the bianry image among Fig. 3 is spliced the panorama bianry image that the back obtains in real time.
S105: the panorama bianry image is proofreaied and correct.
Because the panorama bianry image may be a white gravoply, with black engraved characters, it also may be the black matrix wrongly written or mispronounced character, before carrying out the correction of panorama bianry image, the white with black word image will be carried out inverse handles, for this reason, need to judge whether the panorama bianry image needs to carry out inverse, the panorama bianry image is generally rectangular image, and be scanned character area generally is not strict rectangle, therefore the panorama bianry image is general bigger than being scanned character area, the part that goes out greatly generally is filled to white, only needs utilization to be scanned character area image is judged; Determination methods comprises: in each the row image pixel in being scanned character area, being one group with every N continuous image vegetarian refreshments divides into groups continuously, calculating all grouping interior pixel points then and all be the group of deceiving pixel, to count B and pixel all be that the group of white pixel is counted W, if W＞B, judge that then image is a white gravoply, with black engraved characters, otherwise judge that image is the black matrix wrongly written or mispronounced character; For the panorama bianry image that is identified as the black matrix wrongly written or mispronounced character, wherein the character area that is scanned is carried out inverse and handles; Through judging that panoramic picture shown in Fig. 4 is a white gravoply, with black engraved characters, do not need to carry out inverse and handle.
Literal line in the panorama bianry image is not a level generally, has flexural deformation, it need be corrected into horizontality.Concrete grammar comprises:
(1) merges the literal line that obtains in the panorama bianry image by connected component labeling;
(2) from above-mentioned literal line, select delegation as the correction reference literal line;
(3) utilize the segmentation distance of swimming to blacken the name of technology (segmented run-length smearing) and obtain blackening the name of the benchmark literal line;
(4) by sampling and calculate the buckling curve of literal line to blackening the name of the benchmark literal line;
(5) according to buckling curve the panorama bianry image is proofreaied and correct.
Be as shown in Figure 5 the result after the panorama bianry image is proofreaied and correct among Fig. 4.
S106: by extracting literal line to be identified in the panorama bianry image after the described correction;
By among Fig. 5 as can be seen, except that containing literal line to be identified, may also contain other literal lines in the panorama bianry image, therefore, literal line to be identified need be extracted.Literal line in the panorama bianry image after the correction is in horizontality substantially, along continuous straight runs carries out projection, obtain the projection histogram of black pixel, utilize the minimal value position of projection histogram the literal line in the panorama bianry image can be separated, can obtain each the complete literal line in the panorama bianry image.After obtaining all complete literal lines, according to other positional information identification of the branch of these complete literal lines and extract literal line to be identified, particularly, get in these literal lines literal line near the centre position as literal line to be identified.Contain two style of writing words among Fig. 5, wherein, extract, finally obtain the literal line to be identified shown in Fig. 6 by row near that behavior literal line to be identified in image centre position.
S107: described literal line to be identified is carried out OCR identification and demonstration; Literal line to be identified is sent into the OCR module discern and show the literal that identifies, particularly, can adopt existing OCR recognizer SDK (Software Development Kit).
As shown in Figure 7, embodiments of the invention also provide a kind of character input system that is used to realize above-mentioned character input method, and this system comprises:
Image acquisition device is gathered the two dimensional image for the treatment of input characters;
The USB transmitter sends described two dimensional image to image processor;
Image processor successively carries out binary conversion treatment, splices in real time, proofreaies and correct and extracts literal line to be identified the two dimensional image from described USB transmitter;
The OCR recognizer carries out OCR identification and demonstration to described literal line to be identified;
Controller is controlled described image acquisition device, USB transmitter, image processor and OCR recognizer execution operation separately.
Particularly, described image acquisition device can be wand, described USB transmitter is USB interface and transmission line, and described image processor, OCR recognizer and controller are the software that is arranged at execution and above-mentioned Flame Image Process, the corresponding operation of OCR identification step in the computing machine.
Claims (10)
1. a character input method is characterized in that, may further comprise the steps:
S101: obtain the two dimensional image that is scanned literal on the medium by image acquisition device;
S102: the described two dimensional image that will obtain is real-time transmitted to data processing unit by USB interface and carries out subsequent treatment;
S103: described two dimensional image is carried out binary conversion treatment, obtain bianry image;
S104: based on image registration described bianry image is spliced in real time, obtain to be scanned the panorama bianry image of literal on the medium;
S105: the panorama bianry image is proofreaied and correct;
S106: by extracting literal line to be identified in the panorama bianry image after the described correction;
S107: described literal line to be identified is carried out OCR identification and demonstration.
2. character input method as claimed in claim 1 is characterized in that, among the described step S103, by the adaptive threshold binary processing method described two dimensional image is carried out binary conversion treatment.
3. character input method as claimed in claim 1 is characterized in that, the image registration among the described step S104 is that the displacement relation between adjacent two two field pictures is realized before and after calculating by the overlapping region of mating adjacent image interframe in the described bianry image.
4. character input method as claimed in claim 1 is characterized in that, also comprises before the described step S105:
Judge whether the panorama bianry image exists the white with black word image, if then discern described white with black word image and carry out inverse; Otherwise, direct execution in step S105.
5. character input method as claimed in claim 1 is characterized in that, among the described step S105, blackens the name of disposal route by the segmentation distance of swimming correction of the literal line in the described panorama bianry image is horizontality.
6. character input method as claimed in claim 5 is characterized in that, describedly blackens the name of disposal route by the segmentation distance of swimming and the literal line in the described panorama bianry image is proofreaied and correct to horizontality is comprised:
Merge the literal line that obtains in the described panorama bianry image by connected component labeling;
From described literal line, select delegation as the correction reference literal line;
Blacken the name of method by the segmentation distance of swimming and obtain blackening the name of the benchmark literal line;
By the described benchmark literal line of blackening the name of is sampled and is calculated the buckling curve of literal line;
According to described buckling curve described panorama bianry image being proofreaied and correct is horizontality.
7. character input method as claimed in claim 1, it is characterized in that, among the described step S106, obtain a plurality of complete literal line in the panorama bianry image after the described correction by horizontal projection, and according to described a plurality of complete literal lines separately positional information identification and extract literal line to be identified.
8. as the described character input method of each claim among the claim 1-7, it is characterized in that described step S101 is specially: obtain the two dimensional image that is scanned literal on the medium by wand.
9. a character input system is characterized in that, comprising:
Image acquisition device is gathered the two dimensional image for the treatment of input characters;
The USB transmitter sends described two dimensional image to image processor;
Image processor successively carries out binary conversion treatment, splices in real time, proofreaies and correct and extracts literal line to be identified the two dimensional image from described USB transmitter;
The OCR recognizer carries out OCR identification and demonstration to described literal line to be identified;
Controller is controlled described image acquisition device, USB transmitter, image processor and OCR recognizer execution operation separately.
10. character input system as claimed in claim 9 is characterized in that, described image acquisition device is a wand.
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| CN 201010034478 CN102063611B (en) | 2010-01-21 | 2010-01-21 | Method and system for inputting characters |
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| CN 201010034478 CN102063611B (en) | 2010-01-21 | 2010-01-21 | Method and system for inputting characters |
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