Signature capture technical

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Signature Capture Technical

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  • 1. Signature Capture Technology Home About Us FAQ eSign Portal Tracking the Fast Changing eSignatures and Biometrics Industry Making Paperless Possible by Orion Systems, Inc. [ Register ][ Associations ] [ Technology ] [ Calendar ] [ Did You Know ] [Your Feedback ] [ Ask a Lawyer ] [ Orion Systems ] [ Legal ] eSign Portal Signature Capture Signature Capture Device A device that reads an individuals signature and converts it to a digital form. There are 2 basic types of signature capture technology: pressure sensitive (also known as touch screen) and electromagnetic. Pressure sensitive signature capture devices utilize technology that acts as an input device allowing one to sign their name just by touching the display screen. Signing is typically done using a plastic pen like device that contains no electrical or ink components or a true ink pen that writes ink over a paper that is placed over the signature capture display screen. One could use their finger or some other pointing device but the signature capture quality would suffer. The Technology There are a number of pressure sensitive technologies that are available on the market today. They range from electrically- sensitive (capacitive), acoustically-sensitive (SAW - surface acoustic wave) or photo-sensitive (infra-red). The most dominate signature capture pressure sensitive technology in use today is capacitive. For a good description of the different signature capture pressure sensitive technologies, refer to the Wikipedia descriptions on Touchscreen. Electromagnetic signature capture devices utilize technology comprised of a magnetic field and an electrical field. These types of device do not use pressure sensitive technology and thus require a special pen to transmit the signature capture data points. The signature capture pen is typically electrical while the signature capture pad is the magnetic field Some devices use a hybrid of both technologies. The advantage of pressure sensitive technology is that you do not need a special pen device to function, you merely need to apply pressure. A disadvantage to this technology is that, if more than one pressure point is applied at the same time, the device will sometimes spike and draw an incorrect straight line between the two points. The electromagnet devices do not Signature data formats have this spiking problem. Most signature capture devices convert the signature data points to vector (simply X and Y coordinates data) and transmit the data points to the host using varying formats and communications protocol. Some formats (as well as the device) are designed to be simple and supply a simple stream (similar to a mouse) of data points to an attached host system via the Serial port. The format typically contains the X and Y vector data along with a few control flags. The data is typically sent unencrypted. These types of devices do not typically contain a processor so the extent of what logic can be performed is extremely limited. In many respects these devices behave very similarly as mouse and can be priced somewhere1 de 2 17/01/2011 15:49
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