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
Which scanner technology uses a single row of photosensitive elements to capture an entire page width in one pass?
Answer: CIS (Contact Image Sensor)
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.
What is the primary purpose of adaptive thresholding during document binarization?
Answer: To handle uneven illumination and varying background tones across a document
Adaptive thresholding applies locally computed threshold values to compensate for lighting gradients, shadow, and paper color variations across the document.
In document scanning, what does the term 'optical density range' (Dmax) refer to?
Answer: The maximum range between the lightest and darkest tones a scanner can capture
Optical density range (Dmax) defines the scanner's dynamic range — the span from maximum white to maximum black it can accurately distinguish.
Which image processing technique is used to straighten a document that was fed at a slight angle during scanning?
Answer: Deskew
Deskew algorithms detect the skew angle of text lines or document borders and rotate the image to align content horizontally or vertically.
What is the function of a descreen filter when scanning printed materials?
Answer: Eliminating the halftone dot pattern from commercially printed documents
Descreen filters apply blur or frequency-domain techniques to remove the halftone grid pattern that appears when scanning offset-printed originals.
In high-volume production scanning, what does 'imprinting' or 'endorsing' refer to?
Answer: Physically printing a mark on the document during the scan pass to show it was processed
Imprinters/endorsers are hardware units integrated into production scanners that stamp a batch number, date, or sequence onto the physical document as it passes through.
Which color model is most commonly used for scanned document images intended for print reproduction?
Answer: CMYK
CMYK (Cyan, Magenta, Yellow, Key/Black) is the standard color model for print output, making it the appropriate choice when scanned documents will be reproduced on press.