CN1818926A - Two-dimensional code area precisive positioning method for two-dimensional recognition - Google Patents
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Abstract
A two-dimensional code region accurate orientation method of the two-dimensional code recognition belongs to the field of information memory, orientation and discriminating technique. It is: transform multicolor bitmap of the collective and undiscriminating two-dimensional code to 256 ash bitmap, transform the ash bitmap to binary image, projecting to the X axis and Y axis of the binary image respectively to get the central-point of the two-dimensional code region; the central-point as the jumping-off, scan to the four directions of up, down, left and right, to get the four most-outside points of the two-dimensional code region; the any most-outside point as the new jumping-off turn to counter-clockwise of clockwise direction, to get the new most-outside point; redo the up steps to get the accurate orientation two-dimensional code region. The invention is: improve the data capacity of the code image indirectly that enhance the identified efficiency one time because do not use the seeking-image graph during the process of searching the two-dimensional code region, the confirming process of the two-dimensional code region do not need the image line-in-line scanning, therefore the speed of region orientation is faster.
Description
Technical field
The present invention relates to a kind of two-dimension code zone accurate positioning method that is used for two-dimension code identification, belong to information stores, location and recognition technology field.
Background technology
Existing two-dimension code as shown in Figure 1, the bar code in the two-dimensional space canned data of level and vertical direction is called two-dimension code (2-dimensional bar code), can directly show English, Chinese, numeral, symbol, pattern; The storage data volume is big, can deposit the 1K character, and the direct reading of content of available scanning device need not to connect in addition database.
Two-dimension code can be divided into stack/row row formula two-dimension code and matrix type two-dimension sign indicating number, wherein is that bar code by the multirow cutting back piles up and forms on stack/row row formula two-dimension code form; The matrix type two-dimension sign indicating number is formed with the form of matrix, with " point " expression binary one, represents binary zero with " sky ", by the code that rearranges of " point " and " sky " on matrix respective element position.
The matrix type two-dimension sign indicating number claims the checkerboard type two-dimension code again, and it is to encode by black, the different distributions of white pixel in matrix at a coffin.On matrix respective element position, represent binary one with the appearance of point (square point, round dot or other shapes), not the occurring of point represents that binary " 0 ", the permutation and combination of point determined the meaning of matrix type two-dimension sign indicating number representative.The matrix type two-dimension sign indicating number is that a kind of novel graphical symbol automatically identifying and reading that is based upon on the bases such as computer image processing technology, assembly coding principle is handled code system.
The method in two-dimension code zone, existing location comprises:
1, existing two-dimensional sign indicating number zone location is to determine the target area of two-dimensional bar code by the view finding figure, and the view finding figure in the QR sign indicating number is made up of 3 identical position sensing figures on 3 angles at 4 angles that are arranged in the two-dimension code figure.Each sequence of modules of surveying figure is made of dark color-light color-dark color-light color-dark order, and the ratio of the relative width of each element is 1: 1: 3: 1: 1.
2, when detecting pre-selected zone, the outward flange of one-row pixels and position sensing figure meets in the detected image first and last point.Capable first straight line with last point detection figure that meets with the outward flange position sensing figure to the adjacent image point in this image all discerned.
3, repeat above step, in the Y direction of image, all pixel columns of position sensing centre of figure square are passed in identification.
4, determine to survey centre of figure, central point by A, 2 lines of B on the outermost pixel line that passes position sensing centre of figure piece in X-direction connects a straight line, use the same method and draw a straight line on another vertical direction, the intersection point of two straight lines is exactly the center of position sensing figure.
5, repeating step 1-3 determines the center of other two position sensing figures.
6, survey the coordinate of centre of figure by analysis position, the anglec of rotation of discerning which position sensing figure and be upper left corner figure and symbol is determined the orientation of symbol.
Above-mentioned existing method is to realize locating by the special pattern of seeking in the target area, and the time of seeking target area consumption is long, and bearing accuracy is low.
Goal of the invention
The objective of the invention is to propose a kind of two-dimension code zone accurate positioning method that is used for two-dimension code identification, to improve the recognition speed and the precision of two-dimension code.
The two-dimension code zone accurate positioning method that is used for two-dimension code identification that the present invention proposes may further comprise the steps:
(1) the colored bitmap-converted with the two-dimension code to be identified gathered is 256 color shade bitmaps;
(2) set a threshold value, with the gray-scale value and the threshold of each pixel of above-mentioned gray bitmap, if greater than threshold value, then assignment 1, if less than threshold value, then assignment 0, obtains binary image, and threshold value be less than 255 positive integer greater than zero;
(3) respectively to X-axis, the Y-axis projection of above-mentioned binary image, write down X value, the Y value in jump frequency highest region territory, with this X, the combination of Y value is as the central point in two-dimension code zone;
(4) be starting point from above-mentioned central point, up and down, left and right four direction scans successively, when light areas and darker regions generation saltus step, and the cumulative length of light areas is during less than a length thresholding, finish scanning, obtain four original outermost point in two-dimension code zone;
(5) be that starting point is according to counterclockwise or clockwise direction with above-mentioned any one original outermost point, press its excess-three point of track process of the square box of above-mentioned four outermost point formation, get back to starting point at last, scan, if one side of outermost point of process light areas and darker regions generation saltus step are arranged, then this outermost point is moved to the binary image edge by a fixed step size, obtain a new outermost point, and substitute corresponding original outermost point with this new outermost point;
(6) being more arbitrarily starting point in above-mentioned original outermost point and the new outermost point, repeating step (5), all there is not saltus step between light areas and the darker regions until every limit of described square box, obtain four last outermost point, the square box that is formed by these four last outermost point is the zone of two-dimension code.
In the said method, colored bitmap-converted is that the formula of 256 color shade bitmaps is:
Gray scale=0.2126 * red component+0.7152 * green component+0.0722 * blue component
The two-dimension code zone accurate positioning method that is used for two-dimension code identification that the present invention proposes, its advantage be, owing to do not adopt the view finding figure in the process of seeking the two-dimension code zone, improved the data capacity of sign indicating number figure indirectly, and recognition efficiency is doubled.Definite process in two-dimension code zone does not need the image of input is lined by line scan, so zone location speed is faster.
Description of drawings
Fig. 1 is the structural representation of two-dimension code.
Fig. 2 and Fig. 3 are respectively the pilot process synoptic diagram of zone location in the inventive method.
Among Fig. 1～Fig. 3, the 1st, the clear area, the 2nd, chromatic zones, the 3rd, upwards scan the top outermost point of determining for the first time, the 4th, the left part outermost point that scanning is for the first time left determined, the 5th, through the central point in the definite two-dimension code zone of projection, the 6th, the bottom outermost point that scanning is for the first time downwards determined, the 7th, the right part outermost point that scanning is for the first time to the right determined, the 8th, scan the square box that determined outermost point is formed for the first time, the two-dimension code zone of the guestimate that i.e. scanning for the first time obtains, the 9th, because there is saltus step N the determined outermost point of pixel that move right on limit, 7 place, the 10th, outermost point 3,4,6,9 determined square boxs, i.e. the two-dimension code zone of the estimation that scanning for the second time obtains, the 11st, final determined top outermost point, the 12nd, final determined left part outermost point, the 13rd, final determined right part outermost point, the 14th, final determined bottom outermost point, the 15th, be outermost point 11,12,13,14 definite square boxs.
Embodiment
The two-dimension code zone accurate positioning method that is used for two-dimension code identification that the present invention proposes, at first the colored bitmap-converted with the two-dimension code to be identified gathered is 256 color shade bitmaps; Set a threshold value, with the gray-scale value and the threshold of each pixel of above-mentioned gray bitmap, if greater than threshold value, then assignment 1, if less than threshold value, then assignment 0, obtains binary image, and threshold value be less than 255 positive integer greater than zero; To X-axis, the Y-axis projection of binary image, write down X value, the Y value in jump frequency highest region territory respectively, with this X, the combination of Y value is as the central point in two-dimension code zone; From above-mentioned central point is starting point, up and down, left and right four direction scans successively, when light areas and darker regions generation saltus step, and the cumulative length of light areas is during less than a length thresholding, finish scanning, obtain four original outermost point in two-dimension code zone; With any one original outermost point is that starting point is according to counterclockwise or clockwise direction, press its excess-three point of track process of the square box of above-mentioned four outermost point formation, get back to starting point at last, scan, if one side of outermost point of process light areas and darker regions generation saltus step are arranged, then this outermost point is moved to the binary image edge by a fixed step size, obtain a new outermost point, and this new outermost point is substituted corresponding original outermost point; Being more arbitrarily starting point in above-mentioned original outermost point and the new outermost point, repeat said process, all there is not saltus step between light areas and the darker regions until every limit of square box, obtain four last outermost point, the square box that is formed by these four last outermost point is the zone of two-dimension code.。
In the said method, colored bitmap-converted is that the formula of 256 color shade bitmaps is:
Gray scale=0.2126 * red component+0.7152 * green component+0.0722 * blue component
In the inventive method, be starting point from above-mentioned central point for the first time, up and down, left and right four direction carries out scanning process successively, the two-dimension code zone that obtains is the guestimate to the two-dimension code zone, whenever finish single pass, the capital has an outermost point outwards to move, and the outermost point after moving substitutes original outermost point, and remaining outermost point invariant position.Subsequent scanning is with outermost point after substituting and original outermost point formation square box.
Introduce an embodiment of the inventive method below in conjunction with accompanying drawing 2,3,4,5:
The binary image that the coloured image of being gathered is changed into, as shown in Figure 2, central point 5 by the definite two-dimension code zone of sciagraphy, with central point 5 be starting point up and down, left and right four direction scanning determines four original outermost point 3,4,6,7, the 8th, scan the square box that determined outermost point is formed for the first time, the two-dimension code zone of the guestimate that i.e. scanning for the first time obtains, as shown in Figure 3.To put 7 has been to press counterclockwise track along square box successively through point 3,4,6, get back to a little 7 at last, on the limit of 7 place square boxs, saltus step is arranged, to put the 7 N pixels that move right, be the new outermost point 9 of Fig. 4, the 10th, outermost point 3,4,6,9 determined square boxs, i.e. the two-dimension code zone of the estimation that scanning for the second time obtains.Be starting point to put 9 again, by counterclockwise along the track of square box successively through point 3,4,6, and whether the limit of detecting by each some place has saltus step, if have, then outwards move this point, so circulation, the limit to the last determined four outermost point 11,12,13,14 places does not all have till the saltus step, the 15th, last outermost point 11,12,13,14 determined square boxs are pinpoint two-dimension code zone, as shown in Figure 5.
Claims (2)
1, a kind of two-dimension code zone accurate positioning method that is used for two-dimension code identification is characterized in that this method may further comprise the steps:
(1) the colored bitmap-converted with the two-dimension code to be identified gathered is 256 color shade bitmaps;
(2) set a threshold value, with the gray-scale value and the threshold of each pixel of above-mentioned gray bitmap, if greater than threshold value, then assignment 1, if less than threshold value, then assignment 0, obtains binary image, and thresholding be less than 255 positive integer greater than zero;
(3) respectively to X-axis, the Y-axis projection of above-mentioned binary image, write down X value, the Y value in jump frequency highest region territory, with this X, the combination of Y value is as the central point in two-dimension code zone;
(4) be starting point from above-mentioned central point, up and down, left and right four direction scans successively, when light areas and darker regions generation saltus step, and the cumulative length of light areas is during less than a length thresholding, finish scanning, obtain four original outermost point in two-dimension code zone;
(5) be that starting point is according to counterclockwise or clockwise direction with above-mentioned any one original outermost point, press its excess-three point of track process of the square box of above-mentioned four outermost point formation, get back to starting point at last, scan, if one side of outermost point of process light areas and darker regions generation saltus step are arranged, then this outermost point is moved to the binary image edge by a fixed step size, obtain a new outermost point, and substitute corresponding original outermost point with this new outermost point;
(6) being more arbitrarily starting point in above-mentioned original outermost point and the new outermost point, repeating step (5), all there is not saltus step between light areas and the darker regions until every limit of described square box, obtain four last outermost point, the square box that is formed by these four last outermost point is the zone of two-dimension code.
2, the method for claim 1 is characterized in that the formula that wherein said colored bitmap-converted is 256 color shade bitmaps is:
Gray scale=0.2126 * red component+0.7152 * green component+0.0722 * blue component.
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