# Biometric Quality Assessment This manual has the purpose of describing the parameters considered for the evaluation of the quality of a biometric extraction. The quality evaluation is done during the process of extracting a template. This process aims to determine which are the best images to be used in biometric comparison procedures. Each biometric modality has its various evaluation criteria. Below, the criteria for evaluating face and fingerprint images will be addressed. ## Fingerprint Evaluation The list of parameters evaluated for a fingerprint image is the following: > * Image size; > * Number of minutiae; > * Number of high-reliability minutiae; > * Number of minutiae above the interphalangeal fold; > * Contrast; > * Finger orientation; > * Loss of fingerprint section (edge cut by the reader); > * Finger area; > * Finger extension; > * Value according to the NFIQ standard. ## Face Image Evaluation The list of parameters evaluated for a face image is the following: > * Size; > * Number of faces detected in the image; > * Eye position; > * Face shape match with the ICAO standard; > * Background uniformity; > * Image sharpness; > * Gray level; > * Face orientation; > * Face rotation; > * Open mouth or smile; > * Obstructions on the face; > * Background color. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.griaule.com/gbs/en/overview/biometricevaluation.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.