ISO/IEC 29794-4:2017 establishes

- terms and definitions for quantifying finger image quality,

- methods used to quantify the quality of finger images, and

- standardized encoding of finger image quality,

for finger images at 196,85 px/cm spatial sampling rate scanned or captured using optical sensors with capture dimension (width, height) of at least 1,27 cm × 1,651 cm.