CN101630360A - Method for identifying license plate in high-definition image - Google Patents
Method for identifying license plate in high-definition image Download PDFInfo
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- CN101630360A CN101630360A CN200810040548A CN200810040548A CN101630360A CN 101630360 A CN101630360 A CN 101630360A CN 200810040548 A CN200810040548 A CN 200810040548A CN 200810040548 A CN200810040548 A CN 200810040548A CN 101630360 A CN101630360 A CN 101630360A
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Abstract
The invention relates to a method for identifying a license plate in a high-definition image, which comprises steps of candidate license plate area detection, grayscale image binarization, obliquity correction, character segmentation, character identification and post-processing. Compared with the prior art, the method for identifying the license plate in the high-definition image has the advantages of simultaneous and quick positioning and identification of a plurality of license plates in a complex background with high definition (more than 5,000,000 pixels), good image binarization effect under the condition of non-uniform illumination, variability of license plate obliquity and size in a relatively larger range, and the like, and simultaneously greatly reduces the requirements on the installation of a video camera.
Description
Technical field
The present invention relates to car plate identification, particularly relate to a kind of method of in HD image, discerning car plate.
Background technology
The technical grade high-definition camera of hundred everything elements above (1,300,000～5,000,000) begins to be used for the candid photograph to vehicle image in recent years, because it can provide law enforcement required strong evidence, therefore begins to be applied in security protection and intelligent transportation field.
Existing SD image (45 everything elements are following) licence plate recognition method is difficult to the car plate identification to high-definition image.Reason is that the car plate identification of high-definition image is very high owing to its resolution, viewfinder range is wide, background is complicated, the car plate positioning difficulty is big, have a plurality of car plates to need identification simultaneously in the image, and single car plate in the single background is generally only discerned in existing SD image car plate identification.In addition, practical licence plate recognition method not only requires the discrimination height, and recognition speed wants fast.Therefore how discerning a plurality of number-plate numbers in the high-definition image rapidly and accurately simultaneously, then is that problem to be solved is arranged in the prior art.
Summary of the invention
Technical matters to be solved by this invention is exactly to provide a kind of method of discerning car plate in HD image for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions: a kind of method of in HD image, discerning car plate, it is characterized in that, and may further comprise the steps:
(1) with certain zoom factor, the original image captured of convergent-divergent video camera repeatedly, image of every convergent-divergent, in scaled images, detect the image of a license plate area, with detected license plate area image mapped to original image, after filtration with merge the coincidence pattern picture, according to the characteristic strength of each license plate area image each image is sorted, obtain all license plate area images;
(2) be gray level image with all license plate area image transitions, carry out binary conversion treatment again, obtain binary image;
(3) degree of tilt of correction binary image;
(4) cut apart character in the binary image;
(5) discern the character that is partitioned into, and check.
Described zoom factor comprises horizontal scaling coefficient and vertically scale coefficient.
Described horizontal scaling coefficient and vertically scale coefficient are 0.5.
The image of described detection license plate area comprises:
Color notation conversion space;
The rim detection location.
Described step (2) adopts the GLLT algorithm to carry out binary conversion treatment.
Described step (5) adopts the artificial neural network recognizer that character is discerned, and according to the arrangement regulation of car plate, recognition result is checked.
Compared with prior art, the present invention has advantages such as the quick simultaneously location identification of many car plates under high resolving power (reaching more than the 500 everything elements) complex background, effective, the license plate sloped degree of inhomogeneous illumination condition hypograph binaryzation and the big I of licence plate change in a big way, has significantly reduced the requirement of video camera installation simultaneously.
Description of drawings
Fig. 1 is the process flow diagram of the embodiment of the invention;
Fig. 2 is that the image pyramid of the embodiment of the invention decomposes and the fusion synoptic diagram;
Fig. 3 is that pixel concerns the field synoptic diagram in the GLLT algorithm of the embodiment of the invention;
Fig. 4 is the GLLT algorithm of the embodiment of the invention and the comparison diagram as a result of histogram binaryzation algorithm;
Fig. 5 is the degree of tilt correction principle figure one of the embodiment of the invention;
Fig. 6 is the degree of tilt correction principle figure two of the embodiment of the invention;
Fig. 7 is a synoptic diagram before and after the degree of tilt of the embodiment of the invention is proofreaied and correct.
Embodiment
The invention will be further described below in conjunction with accompanying drawing
Shown in Fig. 1～7, a kind of method of discerning car plate in HD image may further comprise the steps:
(1) with certain zoom factor, the original image captured of convergent-divergent video camera repeatedly, image of every convergent-divergent, in scaled images, detect the image of a license plate area, with detected license plate area image mapped to original image, after filtration with merge the coincidence pattern picture, according to the characteristic strength of each license plate area image each image is sorted, obtain all license plate area images;
(2) be gray level image with all license plate area image transitions, carry out binary conversion treatment again, obtain binary image;
(3) degree of tilt of correction binary image;
(4) cut apart character in the binary image;
(5) discern the character that is partitioned into, and check.
Described zoom factor comprises horizontal scaling coefficient and vertically scale coefficient; Described horizontal scaling coefficient and vertically scale coefficient are 0.5; The image of described detection license plate area comprises:
Color notation conversion space; The rim detection location.
Described step (2) adopts the GLLT algorithm to carry out binary conversion treatment; Described step (5) adopts the artificial neural network recognizer that character is discerned, and according to the arrangement regulation of car plate, recognition result is checked.
Embodiment
One, candidate's license plate area detects
In car plate identification application system, the position that video camera is installed and the scene size of collection have determined the size of car plate in image.When video camera was installed in the side, the car plate size also can differ greatly in the same sub-picture.If it is too strict that the car plate recognizer requires the car plate size, will limit the range of application of car plate identification, bring very burden for the construction debugging.The characters on license plate height setting between 15～50 pixels, can be satisfied most actual requirement of engineering.
In order to detect large scale and undersized car plate simultaneously, adopt the image pyramid formula to decompose, in each grade image, detect the car plate of certain size range.At last pyramid diagrams at different levels are mapped in the original image as detected candidate's license plate area, overlap the zone with merging after filtration, sorted according to characteristic strength in all candidate regions, finally obtain all candidate regions, as shown in Figure 2.The scale-up factor of setting pyramid decomposition level direction and vertical direction is respectively γ
x(＜1.0) and γ
y(＜1.0),, the first order is decomposed by original image I horizontal direction and vertical direction difference convergent-divergent γ
xAnd γ
yDoubly, obtain first order pyramid image I
1, again by I
1Horizontal direction and vertical direction be convergent-divergent γ respectively
xAnd γ
yDoubly, obtain second level pyramid image I
2..., the rest may be inferred can do N (N=1,2,3 ...) and level decomposes.Generally get γ
x=0.5, γ
y=0.5 so that improve the speed of picture breakdown, when identification character is the high car plate of 15～50 pixels, gets N=2.
Each grade pyramid diagram picture is at first carried out color notation conversion space, to find out the purer car plate of those colors apace.The YUV color space has effect preferably to color separated, the car plate that color is purer, after the conversion brightness stronger, have obvious characteristics.For car plate color not obvious (as in shade), then adopt the vertical edge characteristic detection method, the speed that is characterized in is fast and quite good detecting effectiveness arranged.The YUV color space disturbs less, and car plate is located more quick and precisely, and therefore the method that adopts color space to combine with rim detection is carried out the color space location earlier, carries out the rim detection location again, to realize the location quick and precisely of high-definition image car plate.
Two, gray level image binaryzation
Because it is simpler that gray level image carries out binaryzation than coloured image, generally earlier the car plate coloured image that cuts out is converted to gray level image binaryzation again.Binarization method is very many, but does not have method in common.Only just can develop the better binary conversion method at the characteristics of image in the practical application itself.In car plate identification is used,, then can adopt the histogram method binaryzation if illumination is even and contrast is stronger.Histogram method is easy to calculate, and speed is fast.But when uneven illumination is spared, then can't directly use histogram method.When picture contrast is low in addition,, also be difficult to determine the binaryzation threshold value even illumination is even.
GLLT (the Gray Logical LevelTechnique) algorithm that the present invention adopts stroke to cut apart to combine with gray-scale statistical.The GLLT algorithm is considered the stroke characteristics of character fully, also considers the gray-scale statistical characteristics of interior character of subrange and background simultaneously, can solve the binaryzation problem of the even low contrast license plate image of uneven illumination effectively.
In the GLLT algorithm, stroke characteristics according to character, at first divide out with differentiating in the image for pixel that belongs to character stroke and the pixel that belongs to background, the gray-scale value of adding up stroke pixel and background pixels again decides the attribute of the pixel that is not divided in the image.The key step of GLLT algorithm is as follows:
1) (x is that ((x y) is its value after level and smooth to g to picture element in the image for x, the gray-scale value of y y) to establish f.Estimate stroke width W (generally getting W=3) according to character boundary in the image, with in the image every be average gray in center calculation (2W+1) * (2W+1) window:
2) establish that (x, y) 8 of W pixel is P in abutting connection with pixel apart from pixel
0, P
1, Λ, P
7(as shown in Figure 3).If g (x, y) than it 4 in abutting connection with pixel P
i, P
(i+4) mod8, P
(i+1) mod8, P
(i+5) mod8(i=0,1,2,3) high T gray level, then (x y) is divided into " white pixel " (value 255); If g (x, y) than it 4 in abutting connection with pixel P
i, P
(i+4) mod8, P
(i+1) mod8, P
(i+5) mod8(i=0,1,2,3) hang down the T gray level, and then (x y) is divided into " black pixel " (value 128); Otherwise this pixel is labeled as " unfiled pixel " (value 0).Decision rule:
Wherein H (P) is true, if g (x, y)-f (x, y)＞T; L (P) is true, if f (x, y)-g (x, y)＞T.Pixel P '
iAnd P '
I+1Be respectively pixel P
iAnd P
I+1(i=0,1,2,3) are over against the pixel of (180 ° of directions).
3) subregion is calculated respectively and is denoted as 255 and 128 the pairing average gray image value of pixel G
1And G
2
4) classify to being denoted as 0 unfiled pixel according to the following rules:
Fig. 4 has shown the comparison diagram as a result of GLLT algorithm and a few quasi-representative gray level image binaryzation algorithms.The GLLT algorithm adapts to by force, speed is fast.In addition, the GLLT algorithm also has a big advantage, and promptly robustness is stronger, does not have the complicated parameter setting, the more doubt problem of threshold value when having avoided such as the histogram binaryzation.
Three, degree of tilt is proofreaied and correct
The quality that degree of tilt is proofreaied and correct is directly connected to the accuracy of Character segmentation and character recognition, and degree of tilt proofread and correct the car plate recognizer in whole computing time proportion bigger.Therefore, developing effective, fireballing degree of tilt correcting algorithm is emphasis and difficult point problem in the car plate recognizer.In car plate identification, mainly contain two classes: horizontal tilt and vertical bank.Following emphasis is described the degree of tilt correction fast algorithm based on vertical runs length statistics that the present invention proposes, and is example (the horizontal tilt degree is proofreaied and correct similar) with the orthogonal rake correction:
1) finds out character area frame coordinate x
0, x
1, y
0, y
1, and calculate its center point coordinate (x
c, y
c), as shown in Figure 5;
2) off-set value that is set in the up-and-down boundary position is D
k, then (x y) is displaced to (x to picture element
s, y
s) determine (as shown in Figure 6) by following formula:
y
s＝y；
3) to given D
kThe displacement diagram picture, calculate the quadratic sum of vertical direction black and white run length;
4) establish D
MaxBe up-and-down boundary position maximum possible off-set value, at interval [D
Max,+D
Max] interior arbitrary integer off-set value D
k, by the above quadratic sum of calculating vertical direction black and white run length, find out maximal value wherein, then its pairing displacement diagram looks like to be the image after degree of tilt is proofreaied and correct.
Above-mentioned degree of tilt correcting algorithm is very effective, and noise resisting ability is strong.Fig. 7 is synoptic diagram before and after proofreading and correct.
Four, Character segmentation
Character segmentation is to orient the coordinate position of each character in through the binary image after the degree of tilt correction, adopts vertical projection method.This part difficult point is adhesion (comprising the adhesion of frame and character) and damaged Character segmentation, instructs cutting apart of adhesion and damaged character by parameters such as the mean breadth of estimating character, the average height of character, intercharacter mean distances.
Five, character recognition and aftertreatment
Adopt three layers of feedforward artificial neural network to carry out character recognition,, again these sample training are obtained the network weight coefficient by selecting the great amount of samples character.Artificial neural network is the recognizer of a comparative maturity, and it has, and speed is fast, noise resisting ability is strong, particularly damaged character, character size is had effect preferably than the character recognition of small characters, stroke adhesion.But obtain very high character identification rate, need carry out manual evaluation,, train again to improve constantly character identification rate again by the wrong sample data of continuous collection identification to quantity, the quality of each character sample.
Aftertreatment is that recognition result is further checked, according to the licence plate arrangement regulation, position that character and numeral may occur and recognition result are relatively found not to be inconsistent the back and further handled.The character that commute is obscured " 8 " and " B ", " D " and " O " increase special discrimination module again and carry out secondary discrimination after identification.
Claims (6)
1. the method for an identification car plate in HD image is characterized in that, may further comprise the steps:
(1) with certain zoom factor, the original image captured of convergent-divergent video camera repeatedly, image of every convergent-divergent, in scaled images, detect the image of a license plate area, with detected license plate area image mapped to original image, after filtration with merge the coincidence pattern picture, according to the characteristic strength of each license plate area image each image is sorted, obtain all license plate area images;
(2) be gray level image with all license plate area image transitions, carry out binary conversion treatment again, obtain binary image;
(3) degree of tilt of correction binary image;
(4) cut apart character in the binary image;
(5) discern the character that is partitioned into, and check.
2. a kind of method of discerning car plate in HD image according to claim 1 is characterized in that described zoom factor comprises horizontal scaling coefficient and vertically scale coefficient.
3. a kind of method of discerning car plate in HD image according to claim 2 is characterized in that described horizontal scaling coefficient and vertically scale coefficient are 0.5.
4. a kind of method of discerning car plate in HD image according to claim 2 is characterized in that the image of described detection license plate area comprises:
Color notation conversion space;
The rim detection location.
5. a kind of method of discerning car plate in HD image according to claim 1 is characterized in that described step (2) adopts the GLLT algorithm to carry out binary conversion treatment.
6. according to claim 1 a kind of in HD image the method for identification car plate, it is characterized in that described step (5) adopts the artificial neural network recognizer that character is discerned, and, recognition result checked according to the arrangement regulation of car plate.
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