Analytics fights retail shrink

August 2011 CCTV, Surveillance & Remote Monitoring

The economy may be improving, but some retail challenges just will not go away. Global shrink cost retailers US$107-billion last year, according to the Global Retail Theft Barometer, an annual study by the Centre for Retail Research.

In the United States alone, that figure was $39-billion, representing 1,5% of retail sales. The study also shattered the myth that retailers need only worry about shoplifters. In fact, it identified employee theft (44%) as the primary source of shrink in North America, followed by shoplifting (35%) — meaning retailers need to be vigilant in both areas. We believe similar percentages are applicable to South Africa.

The good news is that there are more and better tools to combat theft, including video analytics software. In a nutshell, this technology automatically analyses video to detect events based on multiple images. The best way to appreciate what video analytics does is to compare it to traditional video motion detection. Unlike motion detection, which assumes every pixel change is significant, analytics filters out uninteresting store activity or irrelevant scene changes, such as shadows or change in weather to ensure that only qualified alarms/events are delivered to users.

Retailers have gradually reduced the use of motion detection because of its shortcomings. Even something as benign as light changes caused by headlights after hours may cause alarms to trigger. In contrast, video analytics is capable of distinguishing relevant activity in a store when it occurs and then remembering the details of that activity so that it can be easily found during an investigation or to provide intelligent information in the form of reports or graphs that can be interpreted by users. As a result, video analytics greatly reduces false alarms and provides better loss prevention capabilities as well as other functions such as safety, marketing and operations.

In recent years, four factors have propelled the increased use of video analytics, including increased processing power, algorithm optimisation, video management software (VMS) integration and mobility.

Increased processing power

Moore’s law applies to the exponential increase in processing power that has been made available in both cameras and servers. As a result, retailers can run analytics directly on cameras, while in the server, the use of software with analytics enables the use of processing power available in graphic processing units (GPUs).

As in PCs, an increase in power, this enables applications that simply were not possible before. For example, more CPUs are required for detecting small objects moving quickly. This is because the engine needs to run at a higher resolution (to detect small objects) and also at a higher frame rate (to track fast objects). That has enabled retailers, for example, to identify and track small items that shoplifters may grab and carry quickly to exits, such as iPods, or better segment individual items removed from a shelf.

Optimised algorithms

With increased processing power have come better algorithms. This has not only enabled new applications, but improved existing ones. For example, consider the advantages of better segmentation. Knowing whether it was one or five people who just walked onto a loading dock gives you a better sense of what may be happening and reduces false conclusions.

Since the value of analytics is only as good as the video management software (VMS), some providers have been integrating them into their systems. VMSs can integrate the metadata, making data more usable for alarming, reporting, video review, etc.


With more retailers installing cameras, video data is being created at an unprecedented rate. Meanwhile, it becomes a nearly impossible task for security monitoring personnel to notice all relevant or potentially threatening activity. The ability to send alarms directly to mobile devices on roaming staff enables those close to the scene to be directed there immediately for either security or to assist customers.

Outdoor perimeter

Many retailers are located in rural areas far from police stations. That may encourage thieves to break in, stuff bags full of valuable merchandise and then escape before the police can arrive. By monitoring the outdoor perimeter, video analytics can be set up to identify and send an alert when a vehicle or individuals approach the building within, say, 30 metres after hours. Then central monitoring or mobile personnel can examine the situation to determine if there is a crime in progress.

One retailer that had been using motion detection gave up after a week because it averaged 300 false alarms per night. By implementing video analytics, it reduced the number of alarms to a manageable four.

Loading docks

One of the ways employees steal from retailers is to leave loading dock doors unlocked or hide goods nearby for after hours pickup. Using analytics, an application can be set up so that any time an individual or vehicle stops for more than one minute outside the loading dock, an alarm is sent.

Exit points during store hours

Many large retailers use electronic article surveillance (EAS) to notify them if customers are taking merchandise through exit points without being disarmed at the point of sale. The problem is, as anyone who shops knows, that often when the EAS alarm sounds, cashiers either ignore it or wave the shopper through. Video analytics can be set up to automatically shoot video following an alarm to determine if staff are checking these shoppers.

In one case, a retailer suffering a high level of shrink noted that alarms went off 20 times during a day without staff verifying purchases. Once staff were identified and warned, this problem didn’t reoccur and shrink dropped dramatically.

Protecting high theft items

Every retailer has its own set of high-theft items. Video analytics can be set up in different ways to address the problem. First, it can notify roaming staff if someone is loitering next to high theft items for more than one minute. In such cases, they can come over to assist the customer. As a practical matter, such interventions also scare away potential shoplifters.

Another approach is to have analytics focus on high-theft shelf items and trigger an alarm if more than a certain number are removed from the shelf, since we know that this behaviour is a leading indicator of theft. At that point, roaming staff can determine whether the shopper is paying for these items.

Employee and shopper thefts remain difficult and costly problems. Considering the total price of a video surveillance system, it may cost only 5% more to add video analytics. And with recent advances in video analytics, which have reduced the number of false alarms and increased the number and quality of loss prevention applications, retailers can put a serious dent in their shrink problem at a reasonable investment.

Claude Kee
Claude Kee

For more information contact ANV Holdings, +27 (0)82 339 8699,,

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