Abstract: To determine a read level threshold for discriminating those response bubbles on a scannable answer sheet intended to be marked from those response bubbles not intended to be marked, an adjustable read level threshold is dynamically determined based on the read levels of a designated pool of response bubbles. Response bubble marks having a darkness read level at or above a threshold level are interpreted to be intended response marks, and different response bubbles in which response marks may be found are assigned different predetermined scoring values.

Abstract: A method for extracting information from a document bearing (a) first indicia detectable in a first scan mode, using light in a first spectral range, but not detectable in a second scan mode, using light outside the first spectral range, and (b) second indicia detectable in either the first scan mode or second scan mode, where the second indicia represent information encoded in one or more forms decodable by automated symbol recognition resources, comprise several steps. One or more areas of interest on the document are defined in which the second indicia may appear, with the definition including information specifying the form of encoding for the second indicia. The document is scanned in the second mode, using a scanner that produces a pixel image of the indicia detected and the resulting pixel data are stored in a memory device.

Abstract: The present invention relates generally to the field of optical mark readers and mark scanning systems. More particularly, the present invention relates to a method and system for checking the velocity of a scannable document as it travels under the read head of a mark scanning system.

Abstract: An automatic sheet feeding apparatus (20) for feeding sheets in a forward direction to a scanner device (22) or the like is disclosed. Sheet feeding apparatus (20) includes a frame including side plates (34, 36) a hopper table (40) pivotally mounted at a back edge, and transversely extending frame members (38). A lift mechanism (44) is interconnected to the hopper table (40) for raising the same. A pick roller (26) is utilized to advance the uppermost sheet of the stack of sheets (28) toward the scanner device (22). In addition, the pick roller (26) is operatively interconnected to the lift mechanism (44) to activate the lift mechanism (44) upon being lowered below a predetermined height such that the hopper table (40) is raised by the lift mechanism (44). Sheet separator rollers (30, 32) are positioned forwardly of the pick roller (26) for separating the uppermost sheet from any of the sheets inadvertently moved forwardly therewith.