CN103747213A - Traffic monitoring video real-time defogging method based on moving targets - Google Patents

Traffic monitoring video real-time defogging method based on moving targets Download PDF

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CN103747213A
CN103747213A CN201410017407.5A CN201410017407A CN103747213A CN 103747213 A CN103747213 A CN 103747213A CN 201410017407 A CN201410017407 A CN 201410017407A CN 103747213 A CN103747213 A CN 103747213A
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卓力
胡笑尘
李晓光
张菁
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Beijing University of Technology
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Abstract

The invention relates to a traffic monitoring video real-time defogging method based on moving targets. According to the characteristics of traffic monitoring videos, the contents of video frames are divided into foreground moving targets and background parts, and different methods are respectively adopted for carrying out defogging processing on the foreground and the background, wherein the foreground moving targets are mainly processed. Meanwhile, the relevance between the adjacent frames of the videos is utilized for adopting non-estimation or less-estimation methods on the background, and the processing speed is greatly accelerated. For 720*576 standard-definition videos, the processing speed being 25 frames/second can be reached, the real-time processing requirements can be met, and the problem that the defogging method in the prior art cannot meet the traffic monitoring video real-time processing requirement due to high processing complexity is solved. The defogging processing method provided by the invention has the advantages that higher pertinence is realized, the real color of the foreground moving targets can be more effectively remained, the color distortion can be reduced, and good foundation is laid for the further intelligent processing of traffic videos.

Description

The real-time defogging method capable of a kind of Traffic Surveillance Video based on moving target
Technical field
The invention belongs to image/video signals process field, relate to the real-time defogging method capable of a kind of Traffic Surveillance Video based on moving target.
Background technology
Serious haze weather can cause serious impact to the quality of Traffic Surveillance Video, and mist elimination is processed significant to the follow-up intelligent analysis work of Traffic Surveillance Video.The key of mist elimination processing is to estimate transmissivity and atmosphere light intensity.If estimate and, just can obtain the image after mist elimination by observed image.At present, the defogging method capable based on dark primary priori is main stream approach.
Dark primary priori rule is pointed out: in a regional area of most natural images, some pixel has at least a Color Channel to have very low value.According to dark primary priori rule, can estimate atmosphere light intensity and transmissivity.
The method of estimation of atmosphere light intensity is: in dark primary image, first by the brightness value of each pixel according to successively decrease order according to sequence, then determine that numerical values recited is point residing position in dark primary image of front 0.1%, finally find out the valuation as atmosphere light intensity of maximum in the corresponding original mist image-region in these positions.
The method of estimation of transmissivity is: first, the each pixel that has mist image observing is got to the minimum value in tri-passages of RGB, obtain a width gray level image.Next gray level image is carried out to mini-value filtering operation, then by atmosphere light intensity, deduct the gray value of each point of image after filtering and obtain transmission plot.Transmission plot obtains normalized transmissivity divided by atmosphere light intensity.
Application number is that the patent of CN201210125321.5 discloses a kind of video image defogging method capable based on self adaptation tolerance.The method utilization guiding filtering is carried out refinement to the estimation of transmissivity, thereby obtains more careful transmission plot, makes mist elimination result finer and smoother.But the process of guiding filtering will consume a large amount of time, can not meet the requirement of real-time of Video processing.
Application number is that the patent of CN201110134572.5 discloses a kind of real-time video defogging system.This system does not have huge guiding filtering consuming time, and utilizes digital integrated circuit to realize above-mentioned mist elimination step, by the hardware-accelerated speed that promotes mist elimination processing.The video rate of this system processing 288 × 352 can reach for 60 frame/seconds, and the SD video rate of processing 720 × 576 can reach for 15 frame/seconds.The method can be processed the video that size is less in real time, but can only substantially meet real-time processing requirements for 720 × 576 SD video.
Equal content of differentiate between images not when in addition, above-mentioned two kinds of methods are processed.For Traffic Surveillance Video, this processing method effect being equal to is unsatisfactory.This is because in order to guarantee the mist elimination effect of integral image, tends to cause the moving target in monitoring scene to produce cross-color, and follow-up intelligent analysis is produced to certain impact.
Summary of the invention
The present invention proposes the real-time defogging method capable of a kind of Traffic Surveillance Video based on moving target.The method, according to the feature of Traffic Surveillance Video, is divided into foreground moving target and background part by the content of frame of video, to prospect and background, adopts respectively diverse ways to process.The color characteristics that can retain well like this foreground target, can meet again the requirement of real-time processing, for follow-up transport information intelligent processing method lays the first stone.
For achieving the above object, the present invention by the following technical solutions.
1. the division of video content
What the intelligent processing method of Traffic Surveillance Video was more paid close attention to is moving target, therefore should guarantee emphatically the mist elimination treatment effect of this part content.To the Traffic Surveillance Video collecting, first the present invention adopts neighbor frame difference method that frame of video is divided into moving target and two parts of background.For this two parts content, adopt respectively different defogging method capables to process, to guarantee the video quality after mist elimination.
2. the mist elimination processing of different content
First estimate the value of atmosphere light intensity and transmissivity, then by observed image, obtain the image after mist elimination.The estimation of transmissivity is part the most consuming time in whole mist elimination process.How to introduce the content for Traffic Surveillance Video below, estimate the value of atmosphere light intensity and transmissivity, meet the requirement of processing in real time.
(1) estimation of atmosphere light intensity
Atmosphere light intensity remains unchanged conventionally within long period of time, therefore, and without the value of each frame of video all being estimated to atmosphere light intensity.The present invention estimates the value of an atmosphere light intensity at set intervals to frame of video, thereby greatly reduces the computation complexity of atmosphere light intensity valuation.
(2) estimation of transmissivity
For the frame of video of having estimated atmosphere light intensity, carry out the estimation of transmissivity, and whole frame of video is carried out to mist elimination processing.For other frame of video, moving target and background parts are processed respectively.
1) the mist elimination processing of moving target
For the processing of foreground moving target is had more to specific aim, also in order to promote mist elimination processing speed, the present invention only carries out estimation and the mist elimination processing of transmissivity to foreground moving target, and has removed mini-value filtering process, the speed of estimating to improve transmissivity.
In real life, in air, always exist some particles, people still can feel the impact of mist when the object of observing at a distance, the existence of mist can allow people feel the existence of the depth of field in addition, therefore be necessary in mist elimination, to retain mist to a certain degree, to strengthen the sense of reality and the depth of field sense of image.For this reason, the present invention introduces a decay factor and controls mist elimination dynamics.
2) the mist elimination processing of background
For Traffic Surveillance Video, its background is basic fixing, between consecutive frame, changes not quite, and therefore the present invention directly adopts the mist elimination result in previous frame, no longer reappraises the value of transmissivity, can greatly promote like this speed of mist elimination processing.
When the moving target after mist elimination and background area are combined, obtain a complete mist elimination frame of video.
Compared with prior art, the present invention has following obvious advantage and useful effect:
1. computation complexity is low, execution speed is fast.It is high that existing defogging method capable is processed complexity, cannot meet the demand that Traffic Surveillance Video is processed in real time.The present invention, according to the feature of Traffic Surveillance Video, is divided into foreground moving target and background two parts by the content of frame of video, processes respectively, and wherein emphasis is processed foreground moving target.Meanwhile, utilize the correlation between video consecutive frame, background is adopted and do not estimated or few method of estimating, greatly improved processing speed.For 720 × 576 SD video, can reach the processing speed of 25 frame/seconds, meet the demand of processing in real time.
2. mist elimination processing has more specific aim, can more effectively retain the true colors of foreground moving target.The present invention treats with a certain discrimination foreground moving target and background, and emphasis is processed foreground moving target, for follow-up transport information intelligent processing method is laid a good foundation.
Accompanying drawing explanation
Fig. 1 is the flow chart of defogging method capable involved in the present invention;
Fig. 2 is the image that application the present invention carries out Traffic Surveillance Video mist elimination processing front and back, (a) is the image before mist elimination, is (b) image after mist elimination;
Fig. 3 is the seesaw color contrast image of automobile of application the present invention and guiding filtering method mist elimination, (a) be the automobile image before mist elimination, (b) for the automobile image after application guiding filtering method mist elimination, (c) for applying the automobile image after mist elimination of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
The flow chart of the real-time defogging method capable of Traffic Surveillance Video based on moving target that the present invention proposes as shown in Figure 1, specifically comprises the following steps:
Step 1, carries out mist elimination processing to the first frame of Traffic Surveillance Video.
Step 1.1, estimates atmosphere light intensity.
(1), to there being mist image get the minimum pixel value in tri-Color Channels of RGB and carry out mini-value filtering, obtain dark primary image:
J dark ( x ) = min c ∈ { R , G , B } ( min y ∈ Ω ( x ) ( I c ( y ) ) ) - - - ( 1 )
In formula, J dark(x) be dark primary image; I c(y) for what observe, there is a mist image, y ∈ Ω (x), Ω (x) is a boxed area centered by pixel y.
(2) brightness value of pixel in dark primary image is sorted by the order of successively decreasing, determine that numerical values recited is point residing position in dark primary image of front 0.1%;
(3) find out the maximum of the atmosphere light intensity in the corresponding original mist image-region in these positions, i.e. the valuation of atmosphere light intensity.
Step 1.2, estimates transmissivity.
To there being mist image, get the minimum pixel value in tri-Color Channels of RGB, obtain a width gray level image, with atmosphere light intensity valuation A, deduct the gray value of each point of this image again and the product of attenuation coefficient obtains transmission plot, finally by transmission plot, divided by A, obtain normalized transmissivity:
t ~ ( x ) = 1 - ω min c ∈ { R , G , B } ( I c ( y ) A ) - - - ( 2 )
In formula,
Figure BDA0000456982710000042
for normalized transmissivity valuation; ω is an attenuation coefficient, for controlling the intensity of mist elimination, and 0 < ω≤1, ω gets 0.7 conventionally.
Step 1.3, carries out mist elimination processing.
Image after mist elimination is:
J ( x ) = I ( x ) - A min ( max ( K | I ( x ) - A | | , 1 ) &CenterDot; max ( t ~ ( x ) , t 0 ) , 1 ) + A - - - ( 3 )
In formula, t 0be the lower limit of transmissivity, be conventionally set to 0.1; K is tolerance, and for revising the bright areas that does not meet dark primary a priori assumption, K gets the A value of 0.5-0.6 times conventionally.
Step 2, since the second frame, adopts neighbor frame difference method that frame of video is divided into foreground moving target and background two parts, then to these two parts, adopts respectively different defogging method capables to process.
Step 2.1, the frame that calculates present frame and former frame is poor, is all not more than the part of threshold value T for the three-channel difference of RGB, is judged as background area, and remainder is judged as foreground moving target area.Threshold value T is taken as 2 conventionally.
Step 2.2, if foreground moving target area performs step 1.2,1.3, carries out mist elimination to it; If background area, directly utilizes the mist elimination result of relevant position in previous frame to substitute, no longer carry out defogging.
Step 2.3, repeating step 2, until handle all frame of video.
In order to guarantee that the estimation of atmosphere light intensity A is approached to actual value more, repeated execution of steps 1 and 2, re-starts estimation to A at set intervals.
Shown in Fig. 2 is the Traffic Surveillance Video mist elimination effect contrast figure who adopts the method for the present invention's proposition to obtain.As can be seen from the figure, the method that adopts the present invention to propose, can obtain good mist elimination effect.
For the present invention's mist elimination effect compared with prior art relatively, apply respectively the present invention and guiding filtering method of the prior art carries out mist elimination processing to one section of Traffic Surveillance Video.Fig. 3 is the comparison of two kinds of method mist elimination effects.As can be seen from the figure, adopt the picture contrast after the mist elimination that guides filtering method higher, but the color of automobile is excessively dark, has occurred obvious cross-color.Image after mist elimination of the present invention has retained the true colors of foreground moving target better, for further traffic video intelligent processing method is laid a good foundation.
Application number is that the SD video rate of the patent processing 720 × 576 of CN201110134572.5 can reach for 15 frame/seconds.Experiment shows, the method that the present invention proposes is processed 720 × 576 SD video rate can reach for 25 frame/seconds, met the real-time processing requirements of SD video.The HD video speed of processing 1280 × 720 can reach 13-14 frame/second, and processing speed is very fast.

Claims (2)

1. the real-time defogging method capable of the Traffic Surveillance Video based on moving target, it is characterized in that, according to the feature of Traffic Surveillance Video, the content of frame of video is divided into foreground moving target and background part, to prospect and background, adopt respectively diverse ways to carry out mist elimination processing, comprise the following steps:
Step 1, carries out mist elimination processing to the first frame of Traffic Surveillance Video;
Step 1.1, estimates atmosphere light intensity;
(1), to there being mist image get the minimum pixel value in tri-Color Channels of RGB and carry out mini-value filtering, obtain dark primary image:
J dark ( x ) = min c &Element; { R , G , B } ( min y &Element; &Omega; ( x ) ( I c ( y ) ) )
In formula, J dark(x) be dark primary image; I c(y) for what observe, there is a mist image, y ∈ Ω (x), Ω (x) is a boxed area centered by pixel y;
(2) brightness value of pixel in dark primary image is sorted by the order of successively decreasing, determine that numerical values recited is point residing position in dark primary image of front 0.1%;
(3) find out the max pixel value in the corresponding original mist image-region in these positions, be the valuation A of atmosphere light intensity;
Step 1.2, estimates transmissivity;
To there being mist image, get the minimum pixel value in tri-Color Channels of RGB, obtain a width gray level image, with atmosphere light intensity valuation A, deduct the gray value of each point of this image again and the product of attenuation coefficient obtains transmission plot, finally by transmission plot, divided by A, obtain normalized transmissivity:
t ~ ( x ) = 1 - &omega; min c &Element; { R , G , B } ( I c ( y ) A )
In formula,
Figure FDA0000456982700000013
for normalized transmissivity valuation; ω is an attenuation coefficient, for controlling the intensity of mist elimination, and 0 < ω≤1, ω gets 0.7 conventionally;
Step 1.3, carries out mist elimination processing;
Image after mist elimination is:
J ( x ) = I ( x ) - A min ( max ( K | I ( x ) - A | | , 1 ) &CenterDot; max ( t ~ ( x ) , t 0 ) , 1 ) + A
In formula, t 0be the lower limit of transmissivity, be conventionally set to 0.1; K is tolerance, and for revising the bright areas that does not meet dark primary a priori assumption, K gets the A value of 0.5-0.6 times conventionally;
Step 2, since the second frame, adopts neighbor frame difference method that frame of video is divided into foreground moving target and background two parts, then to these two parts, adopts respectively different defogging method capables to process;
Step 2.1, the frame that calculates present frame and former frame is poor, is all not more than the part of threshold value T for the three-channel difference of RGB, is judged as background area, and remainder is judged as foreground moving target area; Threshold value T gets 2 conventionally;
Step 2.2, if foreground moving target area performs step 1.2,1.3, carries out mist elimination to it; If background area, directly utilizes the mist elimination result of relevant position in previous frame to substitute, no longer carry out defogging;
Step 2.3, repeating step 2, until handle all frame of video.
2. the real-time defogging method capable of a kind of Traffic Surveillance Video based on moving target according to claim 1, it is characterized in that, in order to guarantee that the estimation of atmosphere light intensity A is approached to actual value more, at set intervals between repeated execution of steps 1 and 2, A is re-started to estimation.
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