CDIA Image Processing 2

Question 1

Which color space is most commonly used in document imaging for representing grayscale documents?

Accepted Answer

8-bit grayscale

Answer

8-bit grayscale provides 256 shades of gray and is the standard representation for monochrome document imaging.

Question 2

What does the term 'despeckle' refer to in document image processing?

Accepted Answer

Removing isolated noise pixels

Answer

Despeckle filtering removes isolated noise pixels (salt-and-pepper noise) that appear as random black or white dots on scanned documents.

Question 3

Which image format uses lossless compression and supports transparency, making it suitable for logos in document workflows?

Accepted Answer

PNG

Answer

PNG uses lossless compression and supports alpha channel transparency, making it ideal for logos and graphics in document workflows.

Question 4

In document scanning, what is 'halftone detection' used for?

Accepted Answer

Identifying printed photographs or screened images for appropriate compression

Answer

Halftone detection identifies regions containing photographic or screened content so that appropriate compression (e.g., JPEG) is applied instead of bitonal compression.

Question 5

What is the primary purpose of adaptive thresholding in document binarization?

Accepted Answer

Adjusting the threshold locally based on surrounding pixel values

Answer

Adaptive thresholding calculates a local threshold for each pixel region, handling uneven illumination and background variation better than a single global threshold.

(CDIA) Certified Document Imaging Architect Practice Test

(CDIA) Certified Document Imaging Architect Practice Test

CDIA Image Processing 2