#CONTACT BAR CODE CODE#

the Barcodepedia used a flash application and some web cam for querying a database), have been realized options for resolving the given tasks.

#CONTACT BAR CODE CODE#

All the bar codes appearing in the photo are decoded instantly (ImageID patents and code creation tools) or by use of plugins (e.g. Large field-of-view readers use high resolution industrial cameras to capture multiple bar codes simultaneously.

Video camera readers use small video cameras with the same CCD technology as in a CCD barcode reader except that instead of having a single row of sensors, a video camera has hundreds of rows of sensors arranged in a two dimensional array so that they can generate an image. They use a camera and image processing techniques to decode the barcode. Two-dimensional imaging scanners are a newer type of barcode reader. LED scanners can also be made using CMOS sensors, and are replacing earlier Laser-based readers. The important difference between a CCD reader and a pen or laser scanner is that the CCD reader is measuring emitted ambient light from the barcode whereas pen or laser scanners are measuring reflected light of a specific frequency originating from the scanner itself. Each individual light sensor in the CCD reader is extremely small and because there are hundreds of sensors lined up in a row, a voltage pattern identical to the pattern in a barcode is generated in the reader by sequentially measuring the voltages across each sensor in the row. Each sensor measures the intensity of the light immediately in front of it. In both pen readers and laser scanners, the light emitted by the reader is rapidly varied in brightness with a data pattern and the photo-diode receive circuitry is designed to detect only signals with the same modulated pattern.ĬCD readers (also known as LED scanners) Ĭharge-coupled device (CCD) readers use an array of hundreds of tiny light sensors lined up in a row in the head of the reader. As with the pen-type reader, a photo-diode is used to measure the intensity of the light reflected back from the barcode.

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Contact bar code