CDIA Image Capture & Processing Techniques 2

Question 1

Which scanner technology uses a single row of photosensitive elements to capture an entire page width in one pass?

Accepted Answer

CIS (Contact Image Sensor)

Answer

CIS sensors use a single row of photodetectors spanning the full document width, making them compact and energy-efficient for flatbed and sheet-fed scanners.

Question 2

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

Accepted Answer

To handle uneven illumination and varying background tones across a document

Answer

Adaptive thresholding applies locally computed threshold values to compensate for lighting gradients, shadow, and paper color variations across the document.

Question 3

In document scanning, what does the term 'optical density range' (Dmax) refer to?

Accepted Answer

The maximum range between the lightest and darkest tones a scanner can capture

Answer

Optical density range (Dmax) defines the scanner's dynamic range — the span from maximum white to maximum black it can accurately distinguish.

Question 4

Which image processing technique is used to straighten a document that was fed at a slight angle during scanning?

Accepted Answer

Deskew

Answer

Deskew algorithms detect the skew angle of text lines or document borders and rotate the image to align content horizontally or vertically.

Question 5

What is the function of a descreen filter when scanning printed materials?

Accepted Answer

Eliminating the halftone dot pattern from commercially printed documents

Answer

Descreen filters apply blur or frequency-domain techniques to remove the halftone grid pattern that appears when scanning offset-printed originals.

(CDIA) Certified Document Imaging Architect Practice Test

(CDIA) Certified Document Imaging Architect Practice Test

CDIA Image Capture & Processing Techniques 2