CDIA Scanning Technology 3 — Questions and Answers
Question 1: Which TWAIN specification component acts as the software interface between the application and the scanner driver?
- Data Source
- Application Layer
- Source Manager (Correct answer)
- Protocol Stack
Correct answer: Source Manager
The TWAIN Source Manager acts as the intermediary that brokers communication between scanning applications and individual scanner Data Sources (drivers).
Question 2: What is the effect of scanning a document at 600 DPI compared to 300 DPI, assuming the same document size?
- The file size is halved
- The file size is doubled
- The file size is approximately four times larger (Correct answer)
- The file size remains the same
Correct answer: The file size is approximately four times larger
Doubling DPI in both dimensions quadruples the number of pixels (and thus file size before compression) because pixels increase as the square of the resolution factor.
Question 3: In high-volume document scanning environments, what does 'imprinting' refer to?
- Printing a watermark on the digital image
- Physically stamping or printing a sequence number on the physical document during scanning (Correct answer)
- Adding metadata to the scanned image file
- Embossing the document with a date stamp
Correct answer: Physically stamping or printing a sequence number on the physical document during scanning
Imprinting is a feature where the scanner's integrated printer physically marks the original document with a batch number, date, or sequence number during the scan pass.
Question 4: Which scanning technology is specifically designed to capture images from 16mm or 35mm microfilm rolls?
- Drum scanner
- Microfilm scanner (Correct answer)
- Flatbed scanner with transparency adapter
- Book scanner
Correct answer: Microfilm scanner
Microfilm scanners are purpose-built to digitize images stored on microfilm or microfiche using specialized optical systems and transport mechanisms.
Question 5: What is the purpose of a 'black reference' calibration strip used by production document scanners?
- To set the maximum white point for exposure
- To establish the baseline for absolute black, ensuring accurate tonal reproduction (Correct answer)
- To clean the scan glass automatically
- To detect paper jams
Correct answer: To establish the baseline for absolute black, ensuring accurate tonal reproduction
A black reference strip provides the scanner's sensor with a known black point for calibration, ensuring accurate shadow detail and tonal range across the full grayscale spectrum.
Question 6: When scanning documents for OCR processing, which resolution is generally considered the minimum recommended for acceptable accuracy with standard 12-point text?
- 72 DPI
- 150 DPI
- 300 DPI (Correct answer)
- 600 DPI
Correct answer: 300 DPI
300 DPI is the widely accepted minimum resolution for OCR on standard-sized text, providing sufficient pixel density for accurate character recognition.
Question 7: What does 'duplex scanning' mean in the context of document imaging?
- Scanning two separate documents simultaneously
- Scanning both sides of a page in a single pass through the scanner (Correct answer)
- Scanning at double the normal resolution
- Creating two output file formats simultaneously
Correct answer: Scanning both sides of a page in a single pass through the scanner
Duplex scanning captures both the front (recto) and back (verso) sides of a document in one transport pass using either two scan heads or a flip mechanism.
CDIA Scanning Technology 3
Which TWAIN specification component acts as the software interface between the application and the scanner driver?