Real Time Motion Detection Using Dynamic Camera

Abstract— nowadays, security of valuable and secret assets is very important for large organisation companies. Due to limitation of human resources and man power we need an efficient and reliable security system.

To overcome this limitations and errors we will implement high level surveillance system for security. In our system, we will use dynamic camera for video surveillance which will feed video stream to system. System will perform various image processing operations to detect the object.

Index Terms — Image processing, voting based motion estimation algorithm, Priority based spatial coding algorithm, content based temporal sampling algorithm, Video Surveillance system.

Introduction

Video surveillance systems are a very important in the modern times. Although some people don’t like the idea of being watched, surveillance systems improve the public security, allowing the system to detect dangers and the security forces to react in time. Surveillance systems developed in the recent years from simple surveillance systems into complex structures, containing multiple cameras and high end monitoring centers, armed with elegant hardware and software. However, the future of surveillance systems belongs to automatic tools that assist the system operator and notify him on the detection of security threats. It is important, because in complex systems consisting of multiple cameras, the operator cannot notice all the events.

For efficient and reliable surveillance system, we need high detection rates and low false alarm rates, both of these ordinary methods most of the time does not work in turbulent territory. To eliminate such difficulties, we will be using different algorithms for camera motion estimation, capturing target frame and object detection. Our goal is to detect objects in motion reliably.

Literature Survey

[1] Feng-Li Lian, Yi-Chun Lin,Chien-Ting Kuo, and Jong-Hann Jean,moving object detection using mobile

In this method, using moving camera the video is captured. The reference frame is taken first when the camera starts then current frame and the previous frame both are compared. Utilizing the frame differencing technique first the change detection from the captured images can be performed so the binary image can be generated by this technique that can be used to identify the area with significant difference between two frames or from the current frame to the background frame.

[2] D.Wu,Y.T.Hou, Y. Q. Zhang,Real Time transmission of Video

The video data from these cameras should be transmitted in real time to the control room or end-users for further analysing surveillance-related information. However, transmitting real-time video over a network is a challenge task because video data usually contain large amount of information quantity and the transmission channel might have limited bandwidth. When the transmission amount of video data exceeds the available bandwidth, excessive video flow in the network might lead to time delay and or packet loss, and further, the real-time performance of video transmission would be degraded.

[3]J. M. Shapiro, B. Andersson, N. Pereira, W. Elmenreich

A key solution to video transmission is to reduce the quantity and complexity of original videos but simultaneously preserve the most important message within the original image content. The development of image compression is to reduce the data quantity at the spatial scale for successful transmission. Based on the characteristics of the objects of interest existing in the video images, embedded coding algorithms are well-known techniques for image compression by generating variable bit-rate streams for progression transmission.

I. block diagram

The following block diagram represents the working of real time motion estimation by using dynamic camera. The diagram is divided into two parts. First one is capturing of frame and second part is comparison and object detection. At first, based quality image frame is captured from data stream of multiple frames using some frame grabbing algorithm. Then that frame is names as a recent or current image. The recent or current image is in RGB format which then converted into grey scale image. After RGB to grey scale conversion Gaussian blur technic is used to reduce noise and sharpness in the image. After above process the recent image is compared with background image. Background is image that if image that captured and updated by camera for every particular time frame .for comparison of this two image we need to subtract recent image to background image after subtraction we use threshold technique on resultant image. After threshold technique we get the binary image. We use blob detection algorithm on binary image which help us to detect object in that image .after the object detection object is registered and track.

Fig. 1:Block diagram

I.Camera Motion estimation

In voting based mechanism image processing technique is used for motion estimation and edge detection. Image is necessary in tracking, detecting and recognition applications. There are two types’ image features Frequency features and amplitude features. Edge information of object is usually use for detect the location of moving object.

Voting base mechanism edge detection of object plays very important role .In dynamic camera surveillance system as camera is always moving, the objects in captured images also look like moving objects, even though they are not. We can obtained correct edge information of moving object and still object by subtracting to successive frames .Estimation of camera motion is very important for identifying visual information of moving object. Therefore motion of camera should be estimated first using estimated motion of camera output of edge detection is calculated .The morphological erosion dilation are used to get correct and enhance outcome of moving edges.

II. Content Based Temporal Sampling

In surveillance system with high end camera devices frame rate is high and change of view cause by motion of dynamic camera is very small due to that consecutive captured images are almost identify .Hence transmitting this identical frames on limited bandwidth is not efficient utilization of bandwidth. Due to this problem the content based temporal sampling method is used.

In content based temporal sampling only one image from n number of consecutive frames is selected. The selected images are selected on basis of content of image .Image containing more information is selected compare to image with less information. Image having more edges having more information .Therefore while selecting images blur images are given least preference over sharp images for frame selection canny edge detection is performed to locate edge pixel then number of are count for changing edges on each frame .according to content based temporal sampling algorithm the most important information would be save and less important an identical frame would be removed.

III. Priority based spatial coding

Usually, an image frame can be divided into important and unimportant parts in spatial domain. The importance can be decided based on the outcome of the moving edge detection. For example, moving objects can be considered as the most important information compared with other static objects and background. Hence, the result of the edge detection can also be used to specify the regions with or without moving objects. Therefore, the spatial coding algorithm can be used to encode the region with important information into a frame of higher visual quality and the region without important information into a frame of lower visual quality. Furthermore, an embedded coding algorithm, such as the set partitioning SPIHT, can be used to progressively encode the visual quality based on the currently determined importance and available bandwidth.

IV. CONCLUSION

In this paper we will be implementing a smart surveillance system which will detect moving object as well as abandoned object with dynamic camera. We will be using motion detection algorithm and various images processing technique for detection of objects in video stream. The surveillance system we are going to implement is low cost, efficient and highly reliable. This system will give common man access to use sophisticated security system.

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