You are here: Programmers Reference > Programmer's Reference > SessionInfo Object > MarkThreshold

SessionInfo.MarkThreshold property

Read-Write Property.

Type: L_MARKTHRESH_ENUM

Determines how dark a mark on a form must be before the scanner detects it. It is equivalent to the Threshold dropdown list on the Scanner Control Tab on the Scanning options dialog.

CAUTION: For SelfScore scanners, OMR mark threshold, mark discrimination cutoff, form ID mark threshold, and litho-code mark threshold are set by the scanner. Mark threshold can be set via the SelfScore scanner's control panel; the other values are predetermined. If your application settings differ from the SelfScore scanner settings, the application settings are overridden and no warning message is displayed to the user.

IDL

propget, HRESULT MarkThreshold([out, retval] L_MARKTHRESH_ENUM *pVal);

propput, HRESULT MarkThreshold([in] L_MARKTHRESH_ENUM newVal);

Values

L_MARKTHRESH_INAPP (Default)

Use the mark threshold value configured in the application.

L_MARKTHRESH_SELFSCORE

Use the SelfScore scanner’s mark threshold value. See CAUTION above.

L_MARKTHRESH_LIGHT

Accept very light marks. Same a threshold value of 3.

L_MARKTHRESH_NORMAL

This is the setting to use for most normal scanning tasks. Same as threshold value of 5.

L_MARKTHRESH_DARK

Causes ScanTools Plus to accept only very heavy marks. Same as threshold value of 7.

Some application definitions enable you to select numeric values for the mark threshold. The higher the number, the darker the mark must be to be considered a valid mark. Valid values are:

L_MARKTHRESH_3

L_MARKTHRESH_4

L_MARKTHRESH_5

L_MARKTHRESH_6

L_MARKTHRESH_7

L_MARKTHRESH_8

L_MARKTHRESH_9

L_MARKTHRESH_10

Exceptions

Scanning Services Exceptions

See also

How to Implement Event Driven Scanning

 

 

See Help on Help for additional information on using this help file.

See Scantron Technical Support for additional information on technical support and training options.

See the ScanTools Suite System Requirements for further details on hardware and software requirements.

ScanTools is a suite of products; the specific information you want may appear in the help for a different module. If you don't find what you're looking for here, try one of the following:

  

Scantron Corporation

Customer Service (forms, products, and services):

1-800-SCANTRON (722-6876)

www.scantron.com

Technical Support:

1-800-445-3141

[email protected]

Copyright © 1998-2012 Scantron Corporation. All rights reserved. Use permitted only under license. www.scantron.com. No part of the Help or user guides may be reproduced in any form, or by any means, without express permission from Scantron Corporation.

LINKS TO THIRD PARTY SITES

This help system may contain links to third party websites ("Linked Sites"). The Linked Sites are not under the control of Scantron and Scantron is not responsible for the content of any Linked Site, including without limitation any link contained in a Linked Site or any changes or modifications to a Linked Site. Scantron is not responsible for web casting or any other form of transmission received from any Linked Site. Scantron provides Users with the ability to link the Assessment System to the Linked Sites as a convenience to you, and the inclusion of any link does not imply endorsement by Scantron of the Linked Site or any association with its operators.