CN102572378A

CN102572378A - Moving-target image transmission and restoration technology for protecting user privacy in video monitoring

Info

Publication number: CN102572378A
Application number: CN2010105948040A
Authority: CN
Inventors: 胡茂林
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-16
Filing date: 2010-12-16
Publication date: 2012-07-11

Abstract

The invention discloses a privacy protection method for video monitoring in a sensitive area. According to the invention, through monitoring the moving target in the video monitoring area, only the moving-target images, rather than the images shot by a camera, are transmitted in communication, and the background is white or black, thereby preventing user information in the communication link from being intercepted by hackers; and through the combination of background images stored in various monitoring display equipment (a mobile phone, a large screen and the like), original images can be restored and displayed, thereby realizing the equalization between the privacy protection and the information integrity. The method provided by the invention can be used for monitoring household and important sites, and can effectively prevent the user privacy in the communication link from being intercepted.

Description

The transmission of moving-target image and the recovery technology of protection privacy of user in the video monitoring

Technical field

The invention belongs to the intelligent video field.In order to protect the privacy of sensitizing range; System obtains the moving target image of guarded region through image processing, and communication module is only transmitted this movable image, and wherein background is black or white; Rather than the picture of video camera shooting, prevented on communication link, to leak user profile effectively.

Background technology

Along with the camera industry is changed on a large scale, the application of camera is popularized; At public safety, in the Smart Home monitoring, many cameras have all been used.Artificial and to manage a large amount of cameras constantly obviously impossible, in addition in commercial markets such as Smart Homes, traditional monitoring means that utilize the control room large-screen are incompatibility general user's demand, and following watch-dog should be mobile devices such as mobile phone.Therefore need camera can judge intelligently that interested target occurs, and only send needed information, reduce cost of labor, and save communication network bandwidth and secret protection.

In field of video monitoring, most watch-dog all is the content that directly shows shot by camera at present.Have certain applications the picture that relates to private residence to be blocked and mosaic processing, but to the monitoring of sensitizing ranges such as being applied in the family, these methods are no longer valid all in providing of public safety field.

Summary of the invention

To the video monitoring that is applied to sensitizing ranges such as family, the present invention proposes a kind of brand-new privacy protection policy.Through input picture is carried out motion target detection, communication Shang the interested moving target of transmission user, background are black or white.So not only reduce the data volume of communications, prevented hacker's intercepting user profile from the communication link, realized the balance of monitoring and secret protection well.On showing, in order to satisfy the sense organ demand of user to full frame, through with terminal equipment on background image merge, recover the picture of shot by camera and show.

Description of drawings

What Fig. 1 showed is the camera head monitor zone.

Moving-target (personnel's) appearance appears in Fig. 2 guarded region.

The moving-target image of Fig. 3 communications.

Fig. 4 merges on terminal equipment and images displayed

Fig. 5 system flow chart

Embodiment

Video camera among the present invention sets up in the zone of required monitoring, and video camera is connected with main control computer through data wire.Whole system mainly contains three parts and forms: (1) motion target detection; (2) binary conversion treatment and input picture merge; (3) moving-target based on different platform shows and warning.The system works quick-reading flow sheets is as shown in Figure 4.

Suppose to have only in the scene people in motion, therefore detected moving region is the human body region.Usual way has: (1) background subtraction method, and utilize the difference of present image and background image to detect the moving region, see Fig. 1 and Fig. 2; (2) time differencing method adopts the time difference based on pixel between two or three consecutive frames in the continuous images sequence, obtain frame difference image, and it is carried out reprocessing extracts the moving region in the image.(3) optical flow method has adopted the time dependent light stream characteristic of moving target.

The key of motion detection is that sequence image is extracted region of variation from background image, because the people who moves in the common region-of-interest can not represent that template matching method is inapplicable with a fixing template; The optical flow approach amount of calculation is bigger, and noiseproof feature is poor, and is also inapplicable under complex background, and what often adopt is the method for background subtraction.On the other hand, because the minor variations of some backgrounds often appears in the complex environment, like the swing of curtain, the flicker of computer screen etc., simple background subtraction effect will be affected.Here used adaptive background modeling method, promptly in system, set up the background statistical model of ambient image, extracted foreground area with adaptive background subduction algorithm, and the statistical model of online updating background.Result of the test proves that this method can be applicable to indoor environments such as house preferably.

Before the detection beginning, system continues observation a period of time to nobody's environment earlier, sets up the statistical model of initial environment background.After, to each image that collects constantly, at first carry out denoising, preliminary treatment such as level and smooth.The detection of moving region utilizes the front to set up good background statistical model, draws foreground area by adaptive dynamic background subduction algorithm, and upgrades original background statistical model.Moving-target is judged whether it is because illumination or curtain throw open the background change that causes, if, carry out context update; Otherwise just explain that guarded region has moving target, passing thresholdization obtains a bianry image, carries out binary conversion treatment then.

Binary conversion treatment is for the little target (noise) in the removal of images and fills the cavity in the interesting target, and this binary image and input picture are merged, and produces the image of moving-target; This moving-target image sends on the terminal equipment through wired or wireless mode; The background image of storing on last and the terminal equipment merges, and recovers primary signal, the integrality of realization image, and display alarm the biglyyest.

Claims

1. no matter adopt any moving-target acquisition algorithm, no matter on various terminal equipment, show, such as mobile phone, display, large-screen, panel computer etc., as long as communications is the moving-target image, background is black or white, no matter coded system.

With terminal equipment on picture to synthesize what show be an image, an or picture group picture (with the mode of video);

3. when no matter showing whether with the combining of other warning devices.

All in the protection of this patent.