CDIA Scanning Technology 5 — Questions and Answers
Question 1: What is 'interpolated resolution' in scanner specifications, and how does it differ from optical resolution?
- Interpolated resolution is always lower than optical resolution
- Interpolated resolution is achieved by software adding estimated pixels beyond the scanner's true optical capability (Correct answer)
- Interpolated resolution measures color accuracy rather than spatial detail
- Interpolated resolution refers to the resolution after compression
Correct answer: Interpolated resolution is achieved by software adding estimated pixels beyond the scanner's true optical capability
Interpolated resolution uses software algorithms to mathematically estimate and insert additional pixels beyond what the sensor physically captures, while optical resolution reflects the sensor's true hardware capability.
Question 2: In a high-volume scanning operation, what does 'pages per minute' (PPM) measure?
- The number of physical document sides scanned per minute
- The number of complete document pages (sides) processed per minute at a given resolution (Correct answer)
- The number of files saved per minute
- The number of OCR-processed pages per minute
Correct answer: The number of complete document pages (sides) processed per minute at a given resolution
PPM is a standard scanner throughput metric measuring how many page sides are captured per minute under specified conditions (resolution, paper size, simplex or duplex mode).
Question 3: Which technique is used to improve the readability of scanned text documents that have bleed-through from the reverse side of thin paper?
- Despeckling
- Color dropout (Correct answer)
- Blank page removal
- Bates numbering
Correct answer: Color dropout
Color dropout selectively eliminates specific color channels (often used to drop background colors or colored ink) and can reduce bleed-through visibility by removing the color in which the reverse-side content appears.
Question 4: What is the CDIA best practice recommendation regarding scanning resolution for records that may need to be enlarged or printed at a larger size than the original?
- Scan at 150 DPI to minimize storage costs
- Scan at a higher resolution than standard to preserve detail needed for enlargement (Correct answer)
- Scan at exactly 72 DPI to match screen resolution
- Scan at standard 200 DPI regardless of future use
Correct answer: Scan at a higher resolution than standard to preserve detail needed for enlargement
Documents intended for enlargement or high-quality reprinting should be scanned at higher resolutions (typically 400–600 DPI) to ensure sufficient pixel density for the larger output size.
Question 5: Which ISIS (Image and Scanner Interface Specification) component is equivalent to the TWAIN Data Source?
- ISIS Driver (Correct answer)
- ISIS Manager
- ISIS Bridge
- ISIS Protocol
Correct answer: ISIS Driver
In the ISIS architecture, the ISIS Driver is the hardware-specific component that interfaces directly with the scanner, analogous to the TWAIN Data Source.
Question 6: A document imaging architect is designing a system to scan 200,000 pages per day. Which scanner class is most appropriate?
- Desktop workgroup scanner (up to 3,000 pages/day)
- Departmental scanner (up to 15,000 pages/day)
- Production scanner (50,000–500,000+ pages/day) (Correct answer)
- Personal scanner (up to 500 pages/day)
Correct answer: Production scanner (50,000–500,000+ pages/day)
Production scanners are engineered for continuous-duty, high-volume environments and are rated for 50,000 to over 500,000 pages per day with robust paper handling and duty cycles.
Question 7: What is the primary purpose of performing 'background normalization' during document scanning?
- To standardize the file naming convention of scanned images
- To even out uneven illumination or paper discoloration so the background appears uniformly white (Correct answer)
- To normalize the metadata fields across all scanned documents
- To adjust the scanning speed to a consistent rate
Correct answer: To even out uneven illumination or paper discoloration so the background appears uniformly white
Background normalization compensates for uneven lighting, yellowed paper, or shadows by adjusting pixel values so that background areas render as clean white, improving readability and OCR accuracy.
CDIA Scanning Technology 5
What is 'interpolated resolution' in scanner specifications, and how does it differ from optical resolution?