CDIA Document Imaging Systems & Technologies 5 — Questions and Answers
Question 1: What is the primary difference between 'lossy' and 'lossless' compression in document imaging?
- Lossy compression is faster to decompress than lossless
- Lossy compression permanently discards image data, while lossless preserves all original data (Correct answer)
- Lossless compression always produces smaller files than lossy
- Lossy compression is only applicable to color images
Correct answer: Lossy compression permanently discards image data, while lossless preserves all original data
Lossy compression reduces file size by permanently removing image data, while lossless compression reduces file size without losing any original information, allowing perfect reconstruction.
Question 2: Which scanner technology uses a row of light-sensitive elements that spans the full width of the document to capture an image in a single pass?
- Drum scanner
- CCD (Charge-Coupled Device) linear array scanner (Correct answer)
- 3D structured-light scanner
- Laser interferometry scanner
Correct answer: CCD (Charge-Coupled Device) linear array scanner
CCD linear array scanners use a full-width row of charge-coupled device sensors to capture one line of a document at a time as the scanning element moves across the page.
Question 3: When a CDIA architect specifies a 'capture workstation,' which of the following is a critical performance consideration?
- The monitor's screen refresh rate
- Processor speed and RAM for real-time image processing and indexing (Correct answer)
- The number of USB ports available on the workstation
- The workstation's audio output capabilities
Correct answer: Processor speed and RAM for real-time image processing and indexing
Capture workstations performing real-time image enhancement, OCR, and indexing require adequate CPU processing power and RAM to avoid bottlenecks in high-volume scanning operations.
Question 4: A document imaging project requires that scanned images be searchable without storing separate extracted text files. Which format best fulfills this requirement?
- TIFF with LZW compression
- Bitonal BMP
- Searchable PDF (PDF with embedded text layer) (Correct answer)
- JPEG at 300 DPI
Correct answer: Searchable PDF (PDF with embedded text layer)
Searchable PDF embeds an OCR-generated text layer behind the visible image, enabling full-text search while maintaining the original document appearance in a single file.
Question 5: What does 'throughput' measure in the context of a document scanner?
- The maximum physical document size the scanner can accept
- The number of pages the scanner can capture per minute or hour (Correct answer)
- The total number of metadata fields the scanner can populate
- The network bandwidth consumed by the scanner during operation
Correct answer: The number of pages the scanner can capture per minute or hour
Scanner throughput measures how many pages the device can scan in a given time period (pages per minute or images per minute), directly affecting processing capacity.
Question 6: In document imaging quality control, what does 'rescanning' refer to?
- Running OCR a second time to improve accuracy
- Re-capturing a document that failed initial quality inspection (Correct answer)
- Sending a completed scan batch through workflow a second time
- Compressing an image file to a smaller size after initial storage
Correct answer: Re-capturing a document that failed initial quality inspection
Rescanning is the process of re-capturing a physical document on the scanner when the original scan fails quality checks for legibility, skew, or completeness.
Question 7: Which industry standard defines requirements for the long-term preservation of electronic documents, including scanned images, in a trustworthy digital repository?
- ISO 9001 Quality Management
- ISO 14721 (OAIS — Open Archival Information System) (Correct answer)
- ISO 27001 Information Security Management
- IEEE 802.11 Wireless Networking
Correct answer: ISO 14721 (OAIS — Open Archival Information System)
ISO 14721 (OAIS) defines the reference model for a trustworthy digital archive, specifying information models and responsibilities for long-term preservation of digital objects including scanned documents.
CDIA Document Imaging Systems & Technologies 5
What is the primary difference between 'lossy' and 'lossless' compression in document imaging?