Omr scanner vs image scanner v2.0

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Omr scanner vs image scanner v2.0

Transcript of Omr scanner vs image scanner v2.0

  • 1. OMR Scanner vs. Image Scanner + OMR Software

2. Data Collection SystemsOMR ScannersOMR Software Data Collection Systems 3. How the systems Run?Generate ReportEditing in case of errors Get Student Responses OCRSend Image to Remark Office Software 4. How the systems Run? Scan get student responses010010101010101001 1001010101010010010 1010101010101010Send Student Data to Remark Classic Software Generate ReportIn case of error it reject it or not based in user constraint 5. AccuracyHeavy DutyRunning CostWe have to talk in details for every step of the way 6. Accuracythe desired accuracy during scan 7. Accuracy OMR Scanners OMR Software Consistently 99.9+ % Up to 99.9 % with Editing Validation and scoring on the Validation and scoring occurfly (during scanning). Selected stacker for rejected papers. Not in need to expert personexist while scanning.after scanning. Invalid paper go with normal paper so you will need to search with the scanned images. There is a need to expert person exist while scanning. 8. Why OMR Scanner is more Accurate?1. Read Head DesignIn image scanner if you have the read head begin to waken you will have less accurate in scanning and resolution and you will not know till you have big problems (read head affected with amount of graphics, text and dirty in paper).In OMR Scanner each column have its own LED and if LED have some problem the scanner will let you know and you can fix only this LED, the LED read the place of data only not all the paper. 9. Why OMR Scanner is more Accurate? 2. Feeding The feed rollers (tires) The feed rollers used in image only scanners will transfer pencil graphite from the sheet being scanned to subsequent sheets which can OCR be read as Note: The image only scanners with the easily a mark.Software solution would use a pixel count Scantron EngineeringOMR that will create and density to eliminate this approach for changed feed roller material errors when graphite transfer problem. erasures are on the sheet. This approach sets a As you can imagine, when pencil graphite is transferred to the following sheets, level of 'fill' for the bubble, say 10% which and read as a mark when there really is no mark intended, high stakes testing would be interpreted as a 'hit' for the answer. If results are at serious risk. there is an erasure on the sheet, and the pixel The scanner buffering design count for that bubble is 10%, they have a double The image only scanner doesn't know if there is an error until 3 sheets after the 'hit', so this results in an error. sheet is fed - much too late to do anything about the error due to scanner buffering design. 10. Why OMR Scanner is more Accurate? 3. Mark Discrimination Levels Image Scanner (Bi-Tone) have no mark discrimination levels while OMR Scanner (256 Gray Scale) have 16 Level Results Error Correct Error Correct Error Correct Error Correct Correct Correct Correct Correct Correct Error Correct CorrectThe studyMark was Original at the University of done Bi-Tone/No that 16 Level Mark Discrimination Document Discrimination Georgia showed that running a Fujitsu scanner with the remark software produced about a 3% error rate in the scoring. Most of this error was in multiple marks due to erasures being picked up.Results Correct Correct Correct Correct Correct Correct Correct Correct Correct Correct Correct Correct Correct Correct Correct Correct 11. Why OMR Scanner is more Accurate? 4. OCR process Recognition Area for QuestionA B C D E Wrong (A) OKEach choice have its own Recognition Area (A and C) (B B) The image only scanners with the OCR Software solution would use a pixel count approach for OMR that will create errors when erasures are on the sheet. This approach sets a level of 'fill' for the bubble, say 10% which would be interpreted as a 'hit' for the answer. If there is an erasure on the sheet, and the pixel count for that bubble is 10%, they have a double 'hit', so this results in an error. 12. Why OMR Scanner is more Accurate? 5. Interactive Transport Printer Prints information such as: Error codes. Date or Timestamp. Alphanumeric messages. Batch or serial numbers. Validation flags. Test scores (total score or subtest score) . all this information based on data that is scanned. Printing occurs during scanning so there is no effect on throughput rate. Image Scanners cannot print on the form because it depend on post-scanning processes. 13. Heavy Dutythe main factor is to continue with good performance , not to start with good performance 14. Heavy Duty 1. Materials Rollers (tires): o In image scanner the rollers like printers manufactured from material which affected with dirty and graphite and cleaning material so it can easily read as a mark. o In Scantron OMR Scanner engineers changed roller material and density to eliminate this graphite transfer problem and to be easy to clean. Read head: o In image scanner its one unit (contain camera, mirrors & lamp). o In OMR Scanner its 48 LED (using infrared). 15. Heavy Duty 2. Daily Usage: The image scanner have limited pages to be scanned per day (for example scanner PANASONIC KV-S2048C scan maximum 6,000 page per day).Scantron OMR Scanner can work 24 hours per day. 16. Heavy Duty 3. Open Feed Path:The image scanner have not open feed path so its increase the probability of Jam and in case of jam its not easy to overcome this jamIn OMR Scanner Open feed path design for direct access to roller assemblies and read heads simplifies cleaning and document removal 17. Running Cost 18. Running Cost 1. Form Design (Capacity) Remark uses larger bubbles and cannot space them as closely on the forms as we can with a traditional OMR form. This could create altering tests or going to a 2 page response where with an OMR form this would not be an issue. 19. Running CostPrinting Desktop Printer * In case of small amount of forms. * Problems of packing & printing quality.* Parts lifetime which affect in quality (like heater or toner line lengthwise the form). * Form Shifting.Print Planet * In case of large amount of forms (or accurate forms). * Easy packing & high printing quality. * Avoid headache of low quality of printing due to the parts lifetime (like heater or toner). * Avoid the cost of printer depreciation. * Decrease the probability of Shifting to the minimum rate. 20. Running Cost 3. Machine Cost Image scanners are not designed for serving this area, and if we want to have image scanner which is suitable for this area we will find it in the high volume category and it cost a lot. In the other hand OMR Scanners is designed specially for serving this area so it works for long time and it has modified to strengthens some components which make the lifetime of scanner is more longer with the needed accuracy. 21. Questions