CN105069816B - A kind of method and system of inlet and outlet people flow rate statistical - Google Patents

A kind of method and system of inlet and outlet people flow rate statistical Download PDF

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CN105069816B
CN105069816B CN201510453202.6A CN201510453202A CN105069816B CN 105069816 B CN105069816 B CN 105069816B CN 201510453202 A CN201510453202 A CN 201510453202A CN 105069816 B CN105069816 B CN 105069816B
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people
image
candidate
feature
color
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CN105069816A (en
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魏延文
尹萍
朱树超
韩哲
王正彬
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Shenzhen jovision Technology Co. Ltd.
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JOVISION TECHNOLOGY Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K9/00Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
    • G06K9/00362Recognising human body or animal bodies, e.g. vehicle occupant, pedestrian; Recognising body parts, e.g. hand

Abstract

The present invention relates to a kind of method and system of inlet and outlet people flow rate statistical.The method of the inlet and outlet people flow rate statistical, go out moving region according to Motion feature extraction, there is the region of black and light color development feature with the colour model extraction in color space, motion feature and color development feature are merged, the coloured image of the candidate number of people is obtained, edge extracting is carried out to the coloured image of the candidate number of people, obtains the contour feature of the candidate number of people, fine screening is carried out to the coloured image of the candidate number of people according to number of people contour feature, identifies the number of people and count tracking.The beneficial effects of the invention are as follows:Reduce the background with number of people feature under complex scene and the omission factor of number of people detection is reduced to the flase drop of the number of people, improves the accuracy of inlet and outlet people flow rate statistical.

Description

A kind of method and system of inlet and outlet people flow rate statistical
(One)Technical field
The invention belongs to video monitoring, Computer Vision and analysis, technical field of machine vision, more particularly to it is a kind of into Export the method and system of people flow rate statistical.
(Two)Background technology
With the continuous development of science and technology and information system management, to supermarket, market, station, tourist attractions, bus, sport The flow of the people supervision of the different occasion such as race, public place of entertainment, festival activity is more information-based, intelligent.By to different fields The demographics of conjunction can be reasonable distribution service and pipe with real-time estimation flow of the people, analysis stream of people distribution, the estimation degree of crowding Reason resource, scientific dispatch, safety guarantee provide reliable basis.
Existing people flow rate statistical includes mainly:Artificial statistical, infrared scan counts and the people based on video analysis Number statistics.Artificial statistical in a short time, flow of the people it is sparse in the case of it is reliable, but with the lengthening of time and The increase of stream of people's metric density, statistical accuracy will be greatly lowered.To the crowd is dense, counting error is big for infrared scan counting, because Cannot distinguish one or more people for infrared scan counting, cannot distinguish between people into outgoing direction.People flow rate statistical based on video The programming count of high density flow of the people may be implemented, the existing people flow rate statistical based on video is mainly the following method:
First, the method based on human body segmentation, this method extracts moving target by motion analysis first, then passes through Target Segmentation method, the image segmentation such as based on edge, the Target Segmentation based on coordinate mapping, the target point based on K-Means It the methods of cuts and moving target is split, single human body target is obtained, to realize the statistics of flow of the people.The disadvantages of this method It is in the big scene of stream of people's metric density, the trunk of human body is easy to mutually block, and the segmentation of target is highly difficult, to influence people The statistics of flow.
Second is that the method based on the number of people or head and shoulder, this method replaces the identification of human body with the method for the identification number of people or head and shoulder, The occlusion issue of trunk can be effectively avoided, and the number of people is more closely similar to rigid-object, target detection is made to identify problem Become simpler.There are the people flow rate statistical method detected based on the number of people, method one at present:Hair, face are extracted with half-tone information Product size removes the inhuman head region in part, and carrying out edge detection to obtained binary image extracts profile, is carried out to profile Hough transform identifies the number of people;Method two:It is identified with the method for moving object detection and Hough transform or several annulus templates The number of people;Method three:It is combined with the colour information of YCrCb color spaces and three frame difference Extracting of Moving Object, extraction is candidate Then number of people region is scanned with several circular shutterings and calculates the identification number of people with tight ness rating.Method one is maximum the disadvantage is that meeting By object identification similar in gray scale in static background and hair at hair, a degree of flase drop is caused, while half-tone information does not have Chromatic colour abundant information will also result in certain influence.The shortcomings that method two be Hough transform can by color be different from color development but It is to have the componental movement target identification of similar round feature at the number of people, such as the posture of the shoulder of people or certain moving target. Several annulus templates not only can color be different from color development but the componental movement target identification with similar round feature is at the number of people, And the equally distributed information of number of people profile can be lost, cause the outline identification for being segmented profile point aggregation in annulus at the number of people.Side Three ratio method one of method and method two are all improved, but the template that method three uses is simpler, and several circular shutterings are only to searching The region of rope is defined, and determines whether the number of people only with this standard of tight ness rating.Region is carried out with several circular shutterings Scanning, and can first select to meet the large area of condition as the number of people, further accurate differentiation, can make the false drop rate of identification It increases, while several circular shutterings have blindness during search is matched, if only carrying out the number of people with tight ness rating calculating Identification can cause the imperfect of the identification number of people, to influence the accuracy of identification.
(Three)Invention content
In order to compensate for the shortcomings of the prior art, the present invention provides it is a kind of inlet and outlet people flow rate statistical method and system, Number of people gray scale will easily be had just with the half-tone information and shape information of the number of people by solving current number of people detection algorithm in background The problem of being judged as number of people region with the object of shape feature, reducing under complex scene has the background of number of people feature to the number of people Flase drop, reduce the number of people detection omission factor, improve inlet and outlet people flow rate statistical accuracy.
The present invention is achieved through the following technical solutions:
A method of inlet and outlet people flow rate statistical, it is characterized in that:Include the following steps:
(1), according to camera obtain image, go out moving target using Motion feature extraction;
(2), using the colour model of color space, extract the region with black and light hair feature in image;
(3), motion feature and color development feature merged, obtain the coloured image of the candidate number of people;
(4), edge extracting is carried out to the coloured image of the candidate number of people, obtain the contour feature of the candidate number of people;
(5), fine screening carried out to the coloured image of the candidate number of people according to the contour feature of the number of people, identify the number of people;
(6), count tracking is carried out to the number of people that identifies.
Preferably, in step(1)In, by detecting region of variation in sequence image, moving target is carried from image It takes out, while also needing in real time be updated background model.
Preferably, in step(2)In, according to black and light hair color regularity of distribution under different illumination, chooses and close Suitable color space establishes the model of the distribution of color rule of description black hair and light hair in color space.
Preferably, in step(4)In, the coloured image of the candidate number of people is converted into gray level image, then to gray level image Each pixel is detected, and is found out the larger point of gray-value variation, and handle these points, is made these points that can connect Get up and constitute several lines, obtains the contour feature of the candidate number of people.
Preferably, in step(5)In, the number of people region of acquisition is the target of a similar round, by similar round target Identification, realize and fine screening carried out to the coloured image of the candidate number of people, identify the number of people.
Preferably, in step(6)In, the number of people to identifying judges the disengaging of target by tracking result into line trace Direction, and demographics are carried out in different directions.
A kind of system of inlet and outlet people flow rate statistical, it is characterized in that:Including Fusion Features modular system, the Fusion Features Modular system is connected separately with moving target recognition modular system, color development characteristic extracting module system and edge detection module system System, edge detection module system are connected with number of people screening module system, and number of people screening module system is connected with count tracking module System.
The beneficial effects of the invention are as follows:First, by motion feature, moving target is extracted, is reduced under complex scene The influence that static background with number of people feature detects the number of people.Secondly, black and shallow is carried out to image with color space The extraction of color hair, color model colour gamut is broad, and the color that human eye can perceive can be transferred through color model table Reveal and;Color model is compared with gray scale, the color characteristic of description hair that more can be careful, for black hair and light color Hair can extract, and keep the recognition effect of the number of people more preferable.Again, to the coloured image with color development feature and motion feature The identification for carrying out class circle object, the marginal information that bianry image extraction is compared to the marginal information of coloured image extraction are richer Richness, the number of people detected can be more, to improve the accuracy rate of number of people detection.
(Four)Description of the drawings
The present invention will be further described below with reference to the drawings.
Attached drawing 1 is the flow diagram of the present invention;
Attached drawing 2 is the structural schematic diagram of the present invention;
Attached drawing 3 is the flow diagram of the specific implementation method of demographics in the embodiment of the present invention;
Attached drawing 4 is the particular flow sheet of edge detection in attached drawing 3;
Attached drawing 5 is the particular flow sheet of Head recognition in attached drawing 3.
(Five)Specific implementation mode
Attached drawing is a kind of specific embodiment of the present invention.The embodiment includes the following steps:(1), obtained according to camera Image goes out moving target using Motion feature extraction;(2), using the colour model of color space, extracting has black in image With the region of light hair feature;(3), motion feature and color development feature merged, obtain the coloured image of the candidate number of people; (4), edge extracting is carried out to the coloured image of the candidate number of people, obtain the contour feature of the candidate number of people;(5), according to the wheel of the number of people Wide feature carries out fine screening to the coloured image of the candidate number of people, identifies the number of people;(6), to the number of people that identifies into line trace meter Number.In step(1)In, by detecting region of variation in sequence image, moving target is extracted from image, simultaneously also It needs in real time to be updated background model.In step(2)In, according to black and light hair distribution of color under different illumination Rule chooses suitable color space, and the distribution of color rule of description black hair and light hair is established in color space Model.In step(4)In, the coloured image of the candidate number of people is converted into gray level image, then to each pixel of gray level image Point is detected, and is found out the larger point of gray-value variation, and handle these points, is made these points that can connect composition Several lines obtain the contour feature of the candidate number of people.In step(5)In, the number of people region of acquisition is the target of a similar round, By the identification to similar round target, realizes and fine screening is carried out to the coloured image of the candidate number of people, identify the number of people.In step (6)In, to the number of people that identifies into line trace, by tracking result judge target into outgoing direction, and in different directions into Row demographics.
A kind of method of inlet and outlet people flow rate statistical using the present invention, is as follows:
Step 101, the image obtained according to camera, goes out moving target using Motion feature extraction.
Step 102, using the colour model of color space, the area with black and light hair feature in image is extracted Domain.
Step 103, motion feature and color development feature are merged, obtains the coloured image of the candidate number of people.
Step 104, edge extracting is carried out to the coloured image of the candidate number of people, obtains the contour feature of the candidate number of people.
Step 105, fine screening is carried out to the coloured image of the candidate number of people according to the contour feature of the number of people, identifies the number of people.
Step 106, count tracking is carried out to the number of people identified.
Moving target is obtained using following method in step 101:
In the case of camera is fixed, background is between successive frame will not be changed, and the object only moved is Image can be made to change, be modeled according to the color value of each pixel in image, by current image and background model into Certain compares row, if the pixel color value in the pixel color value and background model on present image coordinate in corresponding coordinate has When larger difference, current pixel is considered as foreground, is otherwise background, determines foreground target according to the result of the comparison.Meanwhile it pressing Background is updated according to certain learning rate, to meet real-time demand.
In step 102, region of the extraction with black and light hair feature by taking Lab color spaces as an example:
Color characteristic has rotational invariance, direction insensitive, extracts relatively easy quick.Influence of the illumination to color can To be made up by acquiring largely sample with black and light hair under different illumination, a large amount of different illumination conditions are acquired Image with the number of people down, samples image color development pixel, and count it in the distribution situation of Lab color spaces, builds Vertical hair color model.Each pixel color value in current image is compared with hair color model, if the picture of present image Plain color value meets the condition of hair color model, then it is assumed that is color development, is otherwise non-hair color, obtains having according to the result of the comparison black The region of color and light hair feature.
In step 103, the fusion of motion feature and color development feature is the fusion in Pixel-level.By two with motion feature Value image and binary image with color development feature carry out operation, are had the binary image there are two types of feature simultaneously. Computational methods are as follows:
Wherein, F (x, y) be pixel value of the binary image with motion feature at (x, y) point, H (x, y) be with Pixel value of the binary image of color development feature at (x, y) point, T (x, y) are while having the binary image there are two types of feature Pixel value at (x, y).
It is the image of binaryzation by what algorithm above obtained, if carrying out edge detection to binary image, obtains Profile information it is fewer, lost the detailed information in region, in order to enrich profile information, needed to convert binary image For coloured image.So, it is also necessary to mask operation is carried out to binary image, computational methods are as follows:
Wherein, T (x, y) is while pixel value of the tool there are two types of the binary image of feature at (x, y), R (x, y) are to work as Pixel value of the preceding coloured image at (x, y).
In step 104, abundant profile information extracts people by taking the Canny algorithms of optimal edge detection as an example in order to obtain Head contour feature.Its step are as follows:
Step 401, noise is eliminated, convolution algorithm is carried out using Gaussian filter;
Step 402, gradient magnitude and direction are calculated, respectively in horizontal and vertical derivation, on both horizontally and vertically Derivative calculations gradient magnitude and direction;
Step 403, non-maxima suppression excludes non-edge pixels, only retains the hachure of some candidate edges;
Step 404, hysteresis threshold connects, and is compared to the amplitude of each location of pixels using high threshold and Low threshold. If the amplitude of a certain location of pixels is more than high threshold, which is just left edge pixel;If a certain location of pixels Amplitude is less than Low threshold, which is excluded;If the amplitude of a certain location of pixels is between two thresholds, which only exists It is retained when being connected to a pixel for being higher than high threshold.
In step 105, video camera is shot from top to bottom, and rigid-object is more closely similar to for the number of people and nonrigid human body, According to the contour feature of the number of people, number of people region is the target of a similar round.By the identification to similar round target, realize to waiting Choose head coloured image carry out fine screening, identify the number of people.By taking Hough gradient algorithm as an example, it is as follows:
Step 501, to each non-zero pixels of edge image, its position is marked, and calculate partial gradient;
Step 502, each point to add up on the specified straight line of slope, obtains accumulator image;
Step 503, during pixel value is more than threshold value and is candidate more than the center pixel of its all neighbour in accumulator image Heart point, and descending arranges;
Step 504, according to it, the descending at a distance from candidate centers arranges edge image non-zero pixels, what selection was most supported One radius;
Step 505, candidate centers obtain edge image non-zero pixels and most adequately support, and with it is selected before Central point has enough distances, then candidate centers are retained, and obtain the center of circle and radius.
In step 106, since the displacement of the number of people target identified between front and back two frame will not change a lot, institute With, whether coincidence is had according to area to determine whether being same target, and judge into outgoing direction according to the direction of displacement, it is real The demographics of existing different directions.
A kind of method of inlet and outlet people flow rate statistical using the present invention, specific implementation method are as follows:
Step 301, the image with the number of people under a large amount of different illumination conditions is acquired, image color development pixel is adopted Sample;
Step 302, it is counted in the distribution situation of color space, establishes hair color model;
Step 303, input picture is obtained from camera;
Step 304, it is modeled according to the color value of each pixel in image;
Step 305, if pixel face in pixel color value and background model on present image coordinate in corresponding coordinate When color value has larger difference, current pixel is considered as foreground, is otherwise background, determines foreground target according to the result of the comparison;
Step 306, background is updated according to certain learning rate, to meet real-time demand;
Step 307, each pixel color value in current image is compared with hair color model, if present image Pixel color value meet the condition of hair color model, then it is assumed that be color development, be otherwise non-hair color, had according to the result of the comparison There is the region of black and light hair feature;
Step 308, the binary image with motion feature and the binary image with color development feature are carried out and is transported It calculates, is had the binary image there are two types of feature simultaneously, using the binary image as mask, mask fortune is carried out to present image It calculates, obtains the coloured image of the candidate number of people;
Step 309, edge extracting is carried out to the coloured image of the candidate number of people, obtains the contour feature of the candidate number of people;
Step 310, according to the contour feature of the number of people, number of people region is the target of a similar round.By to similar round mesh Target identifies, realizes and carries out fine screening to the coloured image of the candidate number of people, identifies the number of people;
Step 311, it will not be changed a lot, be utilized according to the displacement of the number of people target identified between front and back two frame Whether area has coincidence to determine whether being same target, and judges, into outgoing direction, to realize different according to the direction of displacement The demographics in direction.
A kind of system of inlet and outlet people flow rate statistical using the present invention, including:
Moving target recognition modular system, the image for being obtained according to camera go out movement using Motion feature extraction Target;
Color development characteristic extracting module system, for using color space colour model, extract image in have black and The region of light hair feature;
Fusion Features modular system obtains the colour of the candidate number of people for merging motion feature and color development feature Image;
Edge detection module system carries out edge extracting for the coloured image to the candidate number of people, obtains the candidate number of people Contour feature;
Number of people screening module system, for carrying out dusting cover to the coloured image of the candidate number of people according to the contour feature of the number of people Choosing, identifies the number of people;
Count tracking modular system, for carrying out count tracking to the number of people identified.
In moving target recognition modular system 201, specifically for being modeled according to the color value of each pixel in image, Compared with current image is carried out certain with background model, if in pixel color value and background model on present image coordinate When pixel color value in corresponding coordinate has larger difference, current pixel is considered as foreground, is otherwise background, according to what is compared As a result foreground target is determined.Meanwhile background is updated according to certain learning rate, to meet real-time demand.
In color development characteristic extracting module system 202, it is specifically used for acquiring the figure with the number of people under a large amount of different illumination conditions Picture samples image color development pixel, and counts it in the distribution situation of color space, establishes hair color model.According to working as The comparison result of each pixel color value and hair color model in preceding image obtains the area with black and light hair feature Domain.
In Fusion Features modular system 203, it is specifically used for by the binary image with motion feature and with color development spy The binary image of sign carries out and operation, is had the binary image there are two types of feature simultaneously, is to cover with the binary image Code carries out mask operation to present image, obtains the coloured image of the candidate number of people.
In edge detection module system 204, specifically for the coloured image of the candidate number of people is converted to gray level image, then The each pixel of gray level image is detected, the larger point of gray-value variation is found out, and handle these points, makes these Point, which can connect, constitutes several lines, obtains the contour feature of the candidate number of people.
In number of people screening module system 205, it is specifically used for the contour feature according to the number of people, number of people region is a similar round Target.By the identification to similar round target, realizes and fine screening is carried out to the coloured image of the candidate number of people, identify the number of people.
In count tracking modular system 206, it will not be occurred according to the displacement of the number of people target identified between front and back two frame Prodigious variation, using area whether have coincidence to determine whether be same target, and according to the direction of displacement come judge into Outgoing direction realizes the demographics of different directions.
These embodiments are not limitation of the present invention, according to function, method or knot made by these embodiments Equivalent transformation on structure or replacement, all belong to the scope of protection of the present invention within.
A series of detailed description listed by the present invention, only specifically to the feasible embodiment of the present invention It is bright, not to limit the scope of the invention, without departing substantially from spirit of that invention or essential characteristic, with others Concrete form, equivalent way, change mode realize the present invention, should all be included in the protection scope of the present invention.
The present invention describes by way of example, but be not each embodiment only include an independent technical side Case should also consider the specification as a whole, and the technical solutions in the various embodiments may also be suitably combined, form this field The other embodiment that technical staff is appreciated that.
In addition, the embodiment of the present invention is described with flowchart and/or the block diagram, computer program instructions implementation process Figure and/or block diagram, in addition to can providing method, system(Device)Or outside computer program product, computer program can also be provided It instructs in computer Embedded Processor or other programmable data processing devices, it is made to generate flow chart and/or box Function in figure.

Claims (4)

1. a kind of method of inlet and outlet people flow rate statistical, it is characterized in that:Include the following steps:
(1), according to camera obtain image, go out moving target using Motion feature extraction;
(2), using the colour model of color space, extract the region with black and light hair feature in image:According to black Color and light hair color regularity of distribution under different illumination, get colors space, and description black head is established in color space The model of the distribution of color rule of hair and light hair;
(3), motion feature and color development feature merged, obtain the coloured image of the candidate number of people;
(4), edge extracting is carried out to the coloured image of the candidate number of people, obtain the contour feature of the candidate number of people:By the candidate number of people Coloured image is converted to gray level image, is then detected to each pixel of gray level image, it is larger to find out gray-value variation Point, and these points are handled, make these points that can connect and constitute several lines, the profile for obtaining the candidate number of people is special Sign;
(5), fine screening carried out to the coloured image of the candidate number of people according to the contour feature of the number of people, identify the number of people:The people of acquisition Head region is the target of a similar round, by the identification to similar round target, realizes and is carried out to the coloured image of the candidate number of people Fine screening identifies the number of people;
(6), count tracking is carried out to the number of people that identifies.
2. a kind of method of inlet and outlet people flow rate statistical according to claim 1, it is characterized in that:In step(1)In, pass through Region of variation is detected in sequence image, and moving target is extracted from image, while also needing in real time to background model It is updated.
3. a kind of method of inlet and outlet people flow rate statistical according to claim 1, it is characterized in that:In step(6)In, to knowing The number of people not gone out into line trace, by tracking result judge target into outgoing direction, and carry out demographics in different directions.
4. the system used in a kind of method of inlet and outlet people flow rate statistical as described in claim 1, it is characterized in that:Melt including feature Block system is molded, the Fusion Features modular system is connected separately with moving target recognition modular system, color development feature extraction mould Block system and edge detection module system, edge detection module system are connected with number of people screening module system, number of people screening module System is connected with count tracking modular system.
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