The information identifying method of full-filling information card
Technical field
The present invention relates to a kind of information identifying method of full-filling information card, relate in particular to a kind of information identifying method of objective item answer sheet.
Background technology
Optical mark reader (being called for short OMR) is a kind of quick recording device of computing machine.It integrates machine, light, power technology, is widely used in standardization examination and various statistics with its quick, reliable performance.OMR comes across the sixties the earliest, now this system be widely used at home and abroad that examination is goed over examination papers, marked, information handling systems such as statistics even horse racing.
OER is to utilize photoelectricity transformation principle the optical information symbol transition on the release of prescribed form to be become the device of the treatable electric signal of computing machine.Release is normally opened clam for paper cards, some determine that the position is printed on rectangle or the circle marker district that is coated with write information on the paper, with pencil etc. to some sign blackings after, photoelectric conversion part just can be discerned these information by the reflective or delivery capabilities of card, and is converted into electric signal.
But use OMR that the objective item answer sheet is carried out the optical mask identification mode and have following weakness:
A. the printing precision to answer sheet requires height, because traditional OMR machine is by the location, trimming;
B. the half-tone information of only getting cog region is selected, the actual conditions that therefore can not reflect examinee's answer sometimes truly, for example: certain multiple-choice question has four option A, B, C, D, the examinee is 90% and just drawn a line (may be examinee's clerical mistake) in the C answer in the density of full-filling on the B, and the result but is that the answer of this topic is BC;
C. can only use special optical character reader (OCR) device (have only the minority manufacturer production, dependence is big especially);
D. recognition result is lacked later stage verification means;
E. do not have former figure information, the discovery mistake can only be taken out the verification of former papery card, and is extremely inconvenient.
Summary of the invention
In order to overcome traditional use OMR the objective item answer sheet is carried out the above-mentioned shortcoming of optical mask identification mode, the invention provides the information identifying method of the full-filling information card that a kind of typing machine with full-filling information card and information Recognition separate fully.
For realizing purpose of the present invention, the technical solution adopted in the present invention is: a kind of information identifying method of full-filling information card is provided, it is characterized in that may further comprise the steps:
The scanning information card, and the image of scanning is set up index also write down warehouse-in, and making release electronic stencil, be printed with the synchronous head in horizontal stroke/vertical two orientation on this release, the synchronous head in these two orientation is to be used for determining whole release mesh coordinate usefulness, but the zone of all full-fillings is a cog region, and this regional center is corresponding to the center of horizontal/vertical synchronous head; This release electronic stencil content comprises horizontal stroke/vertical synchronous head orientation and synchronous head size and the position of the point of spacing parameter, needs identification, the form that needs format the character string of output;
Image recognition processing, according to index image is discerned processing, concrete grammar is: the centre coordinate position of finding each synchronous head of release earlier according to the template synchronous header, then according to the coordinate of each cog region of Template Location, get the information of each cog region again, choice according to resulting each cog region gray scale and density information decision answer, if for the choice of multiple choice answer, the cog region minimum gray value that can be adjusted at this multiple-choice question is to arriving less than a predetermined value with the answer of multiple-choice question for this reason of interior cog region with interior and density maximal value greater than a predetermined value; If for the choice of single choice answer, it is more little then to get gray scale, the cog region answer of multiple-choice question for this reason that density is big more, final format output result.
The information of described cog region comprises the gray scale of cog region and the density of cog region.
The invention has the beneficial effects as follows:
1. the print request to answer sheet is low, be not to rely on the location, trimming, but to framing, as long as print color is full;
2. gray scale and the density information of getting cog region carry out the answer choice, have reflected that more realistically a part of mistake is coated with examinee's answer wish;
3. as long as all universal scan instrument of supporting TWAIN or ISIS to drive can be used for scanning, speed can be selected from high to low;
4. can call former figure during verification and compare, the parameter in the time of can also recovering identification once more on image is beneficial to have when the user adjusts identification parameter according to seeking.
Description of drawings
Fig. 1 is the objective item answer sheet that traditional OMR can discern.
Fig. 2 is the objective item answer sheet that information identifying method adopted that adopts full-filling information card of the present invention.
Fig. 3 is the image recognition processing process flow diagram of the information identifying method of full-filling information card of the present invention.
Embodiment
The present invention is the information identifying method of the full-filling information card that illustrates of example with the objective item answer sheet, mainly be that answer sheet is become image by scanner scanning, then thereby image is carried out the full-filling information that Symbol recognition obtains the examinee, be referred to as IMR (ImageMark Recognise, pictorial symbol identification).
Use the making of answer sheet of the information identifying method of full-filling information card of the present invention to require as follows: the relative OMR of IMR declines to a great extent to the requirement of answer card printing, (the OMR answer sheet as shown in Figure 1), IMR requires to be printed with the synchronous head (as shown in Figure 2) in horizontal stroke/vertical two orientation on answer sheet, the synchronous head in these two orientation is to be used for determining whole answer sheet mesh coordinate usefulness; But the zone of all full-fillings of student is called cog region, and this regional center is corresponding to the center of horizontal/vertical synchronous head.
Answer sheet electronic stencil make require as follows: make content and comprise horizontal stroke/vertical synchronous head orientation and synchronous head size and the position (being horizontal ordinate) of the point of spacing parameter, needs identification, the form that needs format the character string of exporting etc.
Requiring of image scanning is as follows: any a scanner that select to support TWAIN or ISIS to drive just can be connected with system and scans, and image is set up index and is write down and puts in storage by system.
Image recognition processing: see also Fig. 3, it is the image recognition processing process flow diagram of the information identifying method of full-filling information card of the present invention, according to index image is discerned processing, concrete grammar is: the centre coordinate position of finding each synchronous head of answer sheet earlier according to identification parameter template (being synchronous head information), then according to the coordinate of each cog region of Template Location, get the information (comprising the gray scale of cog region and the density of cog region) of each cog region again, according to the choice of each cog region gray scale of resulting certain multiple-choice question and density information decision answer (in general, the more little expression full-filling of gray scale must be dense more, and the big more expression cog region of density is big more by the area of full-filling.So it is more little generally to get gray scale when the single choice answer is accepted or rejected, the cog region answer of multiple-choice question for this reason that density is big more; And difficulty is is comparatively speaking accepted or rejected in the multiple choice answer, and the cog region minimum gray value that can be adjusted at this multiple-choice question is to arriving effective with interior cog region less than a predetermined value greater than a predetermined value with interior and density maximal value), final format output result.
Verification: carry out image verification afterwards for suspicious paper, image and examinee's full-filling information is compared accuracy with verification identification, and keep the change the paper of papery.