Noise reduction by image subtraction in an automatic data collection device, such as an image acquisition device
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United States of America Patent
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Oct 23, 2012
Grant Date -
Oct 30, 2008
app pub date -
Jul 13, 2006
filing date -
Jul 13, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An automatic data collection device (10) and method reads images from display screen (22) of an electronic display device (24), such as a cellular telephone. The method reads a flashing image of a target machine-readable symbol (12) displayed on the display screen, by obtaining at least two images of the display screen. In the first image, the image of the target machine-readable symbol is present. In the second image, the image of the target machine-readable symbol (12) is absent. The second image of the display screen, when the image of the target machine-readable symbol is absent, comprises noise and other images that are irrelevant to the decoding process. This noise in the second image is subtracted from the first image of the display screen having the image of the target machine-readable symbol displayed thereon the symbol. A resulting image from the image subtraction is an improved image of the target machine-readable symbol.
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