CDIA Image Capture & Processing Techniques 3

Question 1

What is the recommended minimum scanning resolution for documents intended for OCR processing according to industry best practices?

Accepted Answer

300 dpi

Answer

300 dpi is the widely accepted minimum resolution for reliable OCR results, providing enough pixel density to accurately distinguish character shapes.

Question 2

Which type of scanner uses a rotating drum to hold the original and a fixed optical head for ultra-high-resolution capture?

Accepted Answer

Drum scanner

Answer

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.

Question 3

In document imaging, what does 'bit depth' determine?

Accepted Answer

The number of distinct tonal values that can be represented per pixel

Answer

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.

Question 4

What is the purpose of a patch code sheet used in production document scanning?

Accepted Answer

Triggering automatic batch or document separation in the scanning workflow

Answer

Patch code sheets contain specific barcode patterns recognized by scanning software to automatically separate document batches or define new document boundaries.

Question 5

Which algorithm is commonly used to remove isolated noise pixels (salt-and-pepper noise) from a binary scanned image?

Accepted Answer

Median filter

Answer

The median filter replaces each pixel with the median value of its neighborhood, effectively removing isolated noise pixels while preserving edges.

(CDIA) Certified Document Imaging Architect Practice Test

(CDIA) Certified Document Imaging Architect Practice Test

CDIA Image Capture & Processing Techniques 3