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Smart Scale IDs Veggies

Nov 2008
Rebecca Jernigan

There is no doubt as to the usefulness of self-service scales at the grocery store – they reduce waiting time and stress on customers. And, of course, you know what produce you picked up better than any cashier would … or do you? What was the number for those apples again?

Working on behalf of Mettler-Toledo Inc., an industrial weighing company based in Columbus, Ohio, USA, scientists at Fraunhofer Institute for Information and Data Processing IITB have created a webcam module for self-service scales. This device enables the scales to identify automatically what kind of produce has been placed on them, with the system asking the customer to choose from a list of relevant icons. In other words, the scale knows you are weighing an apple – it only asks you which kind.


Intelligent self-service scales, currently being tested in European supermarkets, automatically recognize which type of fruit or vegetable has been placed on them. ©Fraunhofer IITB.

A fruit or vegetable placed on the scale is registered by an integrated camera. An image evaluation algorithm compares the captured image with stored data, thereby identifying it.

Though the concept seems simple, its implementation was fraught with difficulties: Store lighting isn’t optimal for imaging purposes, while produce comes in many shapes, sizes and colours within each category and is usually confined in a cloudy plastic bag. To compensate for these problems, the researchers designed the system to be tolerant to fluctuations in colour and brightness, and they ensured that it could be used under a variety of illumination conditions and with various kinds of cameras. They also included a feature that allows store employees to update the system, enabling it to recognize new varieties of produce.

The system is being tested in approximately 300 supermarkets across Europe.

In optics, an image is the reconstruction of light rays from a source or object when light from that source or object is passed through a system of optics and onto an image forming plane. Light rays passing through an optical system tend to either converge (real image) or diverge (virtual image) to a plane (also called the image plane) in which a visual reproduction of the object is formed. This reconstructed pictorial representation of the object is called an image.
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