CDIA Image Processing 4

Question 1

When scanning documents at 200 DPI versus 300 DPI, what is the primary trade-off?

Accepted Answer

200 DPI has smaller files but may reduce OCR accuracy for small fonts

Answer

Lower DPI (200) produces smaller file sizes but may reduce OCR accuracy, especially for small or complex fonts that need more pixel detail.

Question 2

What is 'line removal' preprocessing used for in document imaging workflows?

Accepted Answer

Eliminating horizontal and vertical lines (e.g., table borders, form lines) before OCR to improve character recognition

Answer

Line removal extracts horizontal and vertical ruling lines from forms or tables before OCR, preventing lines from being misread as characters.

Question 3

Which image quality attribute is most directly affected by the bit depth of a scanner?

Accepted Answer

Tonal range and color accuracy

Answer

Bit depth determines how many distinct tonal values or colors can be captured, directly affecting the tonal range and color accuracy of the scanned image.

Question 4

In document imaging, what does 'punch hole removal' accomplish?

Accepted Answer

Deletes binder holes from scanned pages by filling them with background color

Answer

Punch hole removal detects circular holes along document edges (from 3-hole punches) and fills them with the background color to prevent OCR errors.

Question 5

What is the purpose of gamma correction in scanned document images?

Accepted Answer

Adjusting the nonlinear relationship between pixel values and actual brightness for accurate display

Answer

Gamma correction compensates for the nonlinear response of displays and scanners, ensuring that perceived brightness matches the intended tonal values.

(CDIA) Certified Document Imaging Architect Practice Test

(CDIA) Certified Document Imaging Architect Practice Test

CDIA Image Processing 4