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Overscan is used to scan outside of the boundaries described by ICAP_FRAMES, and is used to help acquire image data that may be lost because of skewing.
Consider the following: Frame Paper Overscan
This is primarily of use for transport scanners which rely on edge detection to begin scanning. If overscan is supported, then the device is capable of scanning in the inter-document gap to get the skewed image information.
Use this capability, if available, to help software processing images for deskew and border removal.
Type: TW_UINT
Value after MSG_OPENDS: (may be remembered from a previous session)
After MSG_RESET/MSG_RESETALL: TWOV_NONE
Allowed Values: TWOV_NONE TWOV_AUTO TWOV_TOPBOTTOM TWOV_LEFTRIGHT TWOV_ALL
MSG_GET TW_ONEVALUE TW_ENUMERATION
MSG_GETCURRENT TW_ONEVALUE
MSG_GETDEFAULT TW_ONEVALUE
MSG_SET TW_ONEVALUE
MSG_SETCONSTRAINT TW_ONEVALUE
TW_ENUMERATION
MSG_RESET TW_ONEVALUE
MSG_QUERYSUPPORT TW_ONEVALUE
None
Version 1.8
TWAIN Notice
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The TWAIN Toolkit is distributed as is. The developer and distributors of the TWAIN Toolkit expressly disclaim all implied, express or statutory warranties including, without limitation, the implied warranties of merchantability, noninfringement of third party rights and fitness for a particular purpose. Neither the developers nor the distributors will be liable for damages, whether direct, indirect, special, incidental, or consequential, as a result of the reproduction, modification, distribution or other use of the TWAIN Toolkit.
