Tenprint Fingerprint Certification Tenprint Fingerprint Quality Standards & Control 2 — Questions and Answers
Question 1: What is the standard image size for a single finger in a rolled tenprint capture according to EBTS?
- 0.5 inch × 0.5 inch
- 1.6 inch × 1.5 inch (Correct answer)
- 2 inch × 2 inch
- 3 inch × 3 inch
Correct answer: 1.6 inch × 1.5 inch
EBTS specifies that each rolled finger impression should be captured at approximately 1.6 inches wide by 1.5 inches tall.
Question 2: What compression algorithm is approved by the FBI for lossy compression of tenprint fingerprint images?
- JPEG
- PNG
- WSQ (Wavelet Scalar Quantization) (Correct answer)
- TIFF LZW
Correct answer: WSQ (Wavelet Scalar Quantization)
WSQ (Wavelet Scalar Quantization) is the FBI-approved lossy compression standard specifically designed for fingerprint images.
Question 3: What is the purpose of slap impressions (four-finger simultaneous) on a tenprint card?
- They replace rolled impressions for quick processing
- They serve as a verification check against the rolled impressions (Correct answer)
- They are used only for palm print classification
- They are taken only from juveniles
Correct answer: They serve as a verification check against the rolled impressions
Slap impressions verify the sequence and identity of the rolled impressions, ensuring no fingers were switched during rolling.
Question 4: Which factor most commonly causes a 'creased' or 'scarred' appearance in fingerprint impressions that can affect quality?
- Too much ink applied
- Occupational wear or skin conditions such as eczema (Correct answer)
- Improper card stock
- Cold ambient temperature
Correct answer: Occupational wear or skin conditions such as eczema
Occupational wear, scars, and skin conditions like eczema or psoriasis can disrupt ridge continuity and degrade impression quality.
Question 5: What action should a tenprint operator take when a subject's fingers are too dry or flaky to produce quality impressions?
- Skip the affected fingers and note on the card
- Apply a small amount of moisturizing lotion and reroll (Correct answer)
- Use a higher resolution scanner only
- File the card as 'unable to print'
Correct answer: Apply a small amount of moisturizing lotion and reroll
Applying a small amount of lotion or breathing on the fingertips to add moisture can improve ridge definition for dry or flaky skin.
Question 6: What is 'slippage' in the context of tenprint fingerprint collection?
- When the subject's finger moves laterally during rolling, causing smeared ridges (Correct answer)
- When the card slips off the inking plate
- When AFIS fails to match a submitted print
- When ink is applied unevenly to the roller
Correct answer: When the subject's finger moves laterally during rolling, causing smeared ridges
Slippage occurs when the subject's finger slides sideways during the rolling motion, producing smeared or doubled ridge images.
Tenprint Fingerprint Certification Tenprint Fingerprint Quality Standards & Control 2
What is the standard image size for a single finger in a rolled tenprint capture according to EBTS?