System and method for imaging test answer sheets having open-ended questions

• US 6,173,154 B1
• Filed: 07/31/1997
• Issued: 01/09/2001
• Est. Priority Date: 07/31/1997
• Status: Expired due to Term

• Current Assignee: Harcourt Assessment Incorporated (Pearson plc)
• Original Assignee: Psychological Corp.
• Inventors: Gonzalez, Jose, Kucinski, Bernard
• Primary Examiner(s): Martin-Wallace, Valencia
• Assistant Examiner(s): ADAMS, CHANDA L
• Application Number:
  US08/903,646
• Time in Patent Office: 1,258 Days
• Field of Search: 434/359, 434/322, 434/353, 434/358, 434/363, 434/178, 434/354, 434/362, 434/356, 434/355, 434/325, 434/326, 434/364
• US Class Current: 434/359
• CPC Class Codes: G06K 17/0032 Apparatus for automatic testing and analysing marked record carriers, used for examinations of the multiple choice answer type teaching apparatus working with questions and answers G09B7/00

Abstract

An imaging system includes two sets of cameras: a first set for capturing optical mark or optical character recognition data and a second set for capturing visual images. Full visual images of pages containing answers to open-ended questions are retained and are retrievable by a reader such that an area of interest wherein the answer is expected is displayed, but the remaining area is also available for viewing. The system permits the alignment of a page based upon edge detection if the page contains only an open-ended answer, obviating the need for timing tracks. Hardware and software elements cooperate to store the image temporarily in a server having a response time commensurate with the scanner. The image is then processed with the use of high-performance index imaging for optical storage and retrieval, and then routed to a long-term storage device.

Claims

1. A method for storing information from a test answer booklet comprising a plurality of answer pages, at least one answer page containing an answer to an open-ended question, the method comprising the steps of:

providing a database of answer page forms comprising data on a physical location of each answer and a type of answer for each page in an answer booklet, the answer type comprising either an answer to an open-end question or an answer to a multiple-choice question;

performing an optical mark recognition scan on each answer page to detect a presence of indicia within a predetermined spectral range, the indicia comprising a mark indicative of a page number;

translating the mark into a page number and tracking the page number of the answer page being scanned;

performing a visual image scan on each answer page to form a digital image of the answer page;

determining from the page number and the forms database whether the page being scanned contains an answer to an open-ended question; and

if the page being scanned contains an answer to an open-ended question, storing the digital image of the answer page.

2. The method recited in claim 1, further comprising the steps, prior to the scanning steps of:

providing a test answer booklet;

separating the booklet into unitary pages; and

advancing each page sequentially along a predetermined path having an optical mark recognition imaging means an a visual imaging means positioned therealong.

3. The method recited in claim 2, further comprising the step, following the page number tracking step, of determining whether the answer pages are in sequence.

4. The method recited in claim 1, further comprising the step of advancing an answer page along a predetermined path, and wherein:

the optical mark recognition scan performing step comprises utilizing a camera positioned along the predetermined path having an infrared filter thereon to detect a pencil mark; and

the visual image scan performing step comprises utilizing a camera substantially unfiltered for infrared wavelengths positioned along the predetermined path.

5. The method recited in claim 4, wherein the optical mark recognition scan performing step further comprises detecting a pencil mark based upon a greyscale, for detecting a correction or an erasure.

6. The method recited in claim 4, wherein the filtered camera comprises a first filtered camera positioned on a first side of the predetermined path and a second filtered camera positioned on a second side of the predetermined path, for scanning for optical marks on both sides of a page during a single pass, and wherein the unfiltered camera comprises a first unfiltered camera positioned on the first side of the predetermined path and a second unfiltered camera positioned on the second side of the predetermined path, for scanning a visual image on both sides of a page during a single pass.

7. The method recited in claim 1, further comprising the step, following the visual image scanning step, of displaying an image of a page to an operator in real time, for performing a check on scanning quality.

8. The method recited in claim 1, wherein the digital image storing step comprises temporarily storing the digital image in a server having a response time sufficiently fast to keep pace with the visual image scanning step.

9. The method recited in claim 8, wherein the digital image storing step further comprises the step, following the temporary storing step, of performing a high-performance image indexing on the visual image.

10. The method recited in claim 9, wherein the digital image storing step further comprises the step, following the indexing step, of transferring the digital image to a long-term optical storage system.

11. The method recited in claim 1, wherein the answer page further contains an optical mark answer to a multiple-choice question and a plurality of preprinted indicia, the method further comprising the steps of:

detecting the locations of the preprinted indicia; and

utilizing the preprinted indicia locations to precisely localize the optical mark answer.

12. The method recited in claim 1, further comprising the steps of:

providing a header page database comprising data on a physical location of file sorting data on a header page;

performing an optical mark recognition scan on a header page to detect a presence of header indicia within the predetermined spectral range, the header indicia comprising data indicative of a succeeding answer booklet; and

storing the header data with the stored digital images for tracking the answer booklet pages.

13. A method for storing information from a test answer booklet comprising a plurality of answer pages, at least one answer page containing an answer to an open-ended question, the method comprising the steps of:

providing a database of answer page forms comprising data on a physical location of each answer and a type of answer for each page in an answer booklet, the answer type comprising either an answer to an open-end question or an answer to a multiple-choice question;

performing an optical character recognition scan on each answer page to detect a presence of indicia within a predetermined spectral range, the indicia comprising a mark indicative of a page number;

translating the character into a page number and tracking the page number of the answer page being scanned;

performing a visual image scan on each answer page to form a digital image of the answer page;

determining from the page number and the forms database whether the page being scanned contains an answer to an open-ended question; and

if the page being scanned contains an answer to an open-ended question, storing the digital image of the answer page.

14. A method for storing information from a test answer page, the page comprising an answer to an open-ended question, the method comprising the steps of:

advancing a page along a predetermined path;

detecting an edge of the page along the predetermined path;

performing a visual image scan on the page along the predetermined path to form a digital image of the answer page;

utilizing the detected edge to align the digital image; and

storing the aligned image of the page.

15. The method recited in claim 14, wherein the visual image scanning step comprises utilizing a camera positioned along the predetermined path.

16. The method recited in claim 15, wherein the camera comprises a first camera positioned on a first side of the predetermined path and a second camera positioned on a second side of the predetermined path, for scanning a visual image on both sides of a page during a single pass.

17. A method for storing information from a test answer booklet comprising a plurality of answer pages, at least one answer page containing an answer to an open-ended question, the method comprising the steps of:

electronically detecting and translating an indicium indicative of a page number on an answer page;

accessing a forms database to determine whether the answer page contains an answer to an open-ended question;

performing a visual image scan on the answer page to form a digital image thereof; and

storing the visual image scan in an electronic storage unit if the accessing step provides a determination that the answer page contains an open-ended question.

18. The method recited in claim 17, wherein the detecting step comprises performing one of an optical mark recognition scan or an optical character recognition scan.

19. The method recited in claim 17, further comprises the step, following the translating step, of determining whether the answer page is in a predetermined sequence with other answer pages.

20. The method recited in claim 17, further comprising the step, following the visual image scan performing step, of performing a quality control check and, if the quality control check determines an insufficient quality, repeating the visual image scan performing step.

21. The method recited in claim 17, wherein the storing step comprises temporarily storing the image in a fast storage server and subsequently transferring the temporarily stored image to a long-term storage unit.

22. The method recited in claim 21, further comprises the step, preceding the transferring step, of performing a high-performance image indexing on the image for aiding subsequent image retrieval.

23. The method recited in claim 21, wherein the long-term storage unit comprises an optical jukebox.