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Marco Realacci 2025-01-14 01:48:39 +01:00
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.obsidian/workspace.json vendored
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@ -42,18 +42,18 @@
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"Biometric Systems/notes/8 Face anti spoofing.md", "Biometric Systems/notes/8 Face anti spoofing.md",
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2
Biometric Systems/notes/11. Fingerprints.md
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@ -101,6 +101,8 @@ Once a fingerprint has been segmentated we can start extracting **macro-features
##### Directional map ##### Directional map
~~The local orientation of the ridge line in the position [i, j] is defined as the angle $\theta(i,j)$ formed by considering the horizontal line at that point, and a point on the ridge line sufficiently closer to [i, j].~~ ~~The local orientation of the ridge line in the position [i, j] is defined as the angle $\theta(i,j)$ formed by considering the horizontal line at that point, and a point on the ridge line sufficiently closer to [i, j].~~
Definizione: matrice in cui la cella [i, j] rappresenta l'angolo che la tangente alla ridge line forma con l'asse orizzontale.
![[Pasted image 20241127224325.png]] ![[Pasted image 20241127224325.png]]
- most approaches use a grid measure (instead of measuring at each point) - most approaches use a grid measure (instead of measuring at each point)
- the directional image D is a matrix in which each element denotes the average orientation of the ridge (of the tangent to the ridge) in a neighborhood of $[x_{i}, y_{i}]$ - the directional image D is a matrix in which each element denotes the average orientation of the ridge (of the tangent to the ridge) in a neighborhood of $[x_{i}, y_{i}]$