Image Capture & Processing Techniques Flashcards
7 cards from real CDIA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Image Capture & Processing Techniques flashcards as text
What is the recommended minimum scanning resolution for documents intended for OCR processing according to industry best practices?
Answer: 300 dpi
300 dpi is the widely accepted minimum resolution for reliable OCR results, providing enough pixel density to accurately distinguish character shapes.
Which type of scanner uses a rotating drum to hold the original and a fixed optical head for ultra-high-resolution capture?
Answer: Drum scanner
Drum scanners mount the original on a spinning cylinder and use a photomultiplier tube to capture extremely high-resolution images, often used in professional prepress.
In document imaging, what does 'bit depth' determine?
Answer: The number of distinct tonal values that can be represented per pixel
Bit depth defines how many discrete gray levels or color values each pixel can represent; 1-bit gives black/white only, while 8-bit provides 256 gray levels.
What is the purpose of a patch code sheet used in production document scanning?
Answer: Triggering automatic batch or document separation in the scanning workflow
Patch code sheets contain specific barcode patterns recognized by scanning software to automatically separate document batches or define new document boundaries.
Which algorithm is commonly used to remove isolated noise pixels (salt-and-pepper noise) from a binary scanned image?
Answer: Median filter
The median filter replaces each pixel with the median value of its neighborhood, effectively removing isolated noise pixels while preserving edges.
When scanning double-sided documents, what feature allows a scanner to capture both sides in a single pass without manually flipping pages?
Answer: Duplex scanning
Duplex scanning uses sensors or mirrors on both sides of the document path to simultaneously capture front and back of each page in one pass.
What is 'image cleanup' or 'image enhancement' software typically used for in document capture workflows?
Answer: Automatically improving image quality by removing defects like speckles, borders, and skew
Image cleanup software applies automated post-processing algorithms to correct scanning artifacts, remove borders, fix orientation, and improve image quality before storage or OCR.