Scanning Technology Flashcards

Which scanner type uses a stationary light source and moves the document past it using a roller mechanism?

Answer: Sheet-fed scanner

Sheet-fed scanners transport documents past a fixed scan head using rollers, making them ideal for high-volume document processing.

What is the primary advantage of using a CIS (Contact Image Sensor) over a CCD in a document scanner?

Answer: Thinner and lower power consumption

CIS sensors are much thinner and consume less power than CCD arrays because they don't require an optical reduction system.

In document scanning, what does the term 'deskew' refer to?

Answer: Correcting the angular misalignment of scanned documents

Deskewing is the automatic or manual correction of document rotation caused by slight misfeeds or placement errors during scanning.

Which image file format uses lossless compression and supports transparency, making it suitable for certain scanned documents?

Answer: PNG

PNG uses lossless compression and supports transparency, preserving all image data without degradation.

What is 'despeckle' as applied to scanned document images?

Answer: Removal of random noise pixels from the scanned image

Despeckle filters identify and remove isolated noise pixels (speckles) that typically result from document imperfections or scanner noise.

A CDIA candidate is evaluating scanners for a project involving bound books. Which scanner type is most appropriate?

Answer: Overhead book scanner

Overhead book scanners (also called planetary scanners) capture images without requiring the document to be fed through rollers, preserving bound books.

What scanning parameter determines the number of bits used to represent each pixel in a grayscale image?

Answer: Bit depth

Bit depth (also called color depth or pixel depth) defines how many shades of gray can be represented per pixel; 8-bit grayscale yields 256 shades.