Gray scale optical mark reader

Details Gray scale optical mark reader Gray scale optical mark reader

2005-11-29

2005-11-29

Garcia, Gabriel (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Plural marking means

C358S001900

Reexamination Certificate

active

06970267

ABSTRACT:
In a broad aspect of the invention, the master printed form is scanned and processed according to a forms definition program to produce a virtual form file comprising a virtual layout of the significant regions such as bubble targets of printed material on the form, on a virtual coordinate system. Production forms that have been marked by subjects (e.g., students, voters, survey respondents, etc.), are then scanned to produce a marked form file of gray scale darkness values for each marked form. The marked form file and the virtual form file, are compared and processed to determine the location and spatial relationships of the marks on the marked form, in relation to the virtual coordinate system of the virtual form. The raw scan of each marked form is also processed to determine whether darkened areas on the marked form image should be interpreted as intentional responses from the subject, at the virtual coordinates where targets are located on the virtual form.

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patent: 6210171 (2001-04-01), Epstein et al.
patent: 6418409 (2002-07-01), Metzger

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