Scanning Technology 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 Scanning Technology flashcards as text
Which scanning artifact appears as a repetitive pattern of light and dark bands caused by interference between the scanner sampling frequency and the halftone screen frequency of printed images?
Answer: Moiré pattern
Moiré patterns occur when the scanner's sampling grid interacts with the periodic dot pattern of halftone-printed images, creating an unwanted interference pattern.
In a document imaging system, what is the function of an ADF (Automatic Document Feeder)?
Answer: To automatically feed multiple documents sequentially through the scanner without manual intervention
An ADF is a mechanical attachment that picks and feeds individual sheets from a stack, enabling unattended high-volume scanning operations.
What is 'optical density' (OD) as it relates to scanner specifications?
Answer: A measure of a scanner's ability to distinguish detail in very dark or very light areas
Optical density (Dmax) measures the scanner's ability to capture detail across its tonal range, particularly in shadows; higher Dmax values indicate better shadow detail capture.
A production scanner consistently produces images with a faint shadow of the previous page visible in the current scan. This is known as:
Answer: Ghosting
Ghosting occurs when residual charge or optical persistence in the scanner's sensor causes a faint echo of a previously scanned image to appear in subsequent scans.
Which color model is most commonly used internally by document scanners to capture color information?
Answer: RGB
Document scanners use RGB (Red, Green, Blue) as their native color model because it directly corresponds to the sensor's red, green, and blue light-sensitive elements.
What is the purpose of using a 'patch code' document in production scanning environments?
Answer: To automatically separate batches or trigger specific processing actions based on a printed barcode pattern
Patch codes are specially printed barcode-like patterns inserted between document batches to signal the scanner software to start a new batch or initiate a specific workflow action.
When scanning fragile historical documents, which scanning mode minimizes physical stress on the document?
Answer: Overhead (planetary) scanning mode
Overhead planetary scanners capture images without any contact with the document, eliminating the physical stress caused by rollers or pressure plates.