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Ridge Tracing and Counting

Ridge counting and tracing involves analyzing fingerprint patterns. To count ridges, an imaginary line is drawn from the delta to the core, counting each ridge the line crosses. Ridge tracing for whorls involves tracing from the left delta to a point opposite the right delta, classifying the tracing as inner, outer, or meeting based on ridge counts inside or outside the right delta. Tracing double loops or accidentals considers the extreme deltas and stops tracing at the nearest point opposite the right delta.

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Gesler Pilvan Sain
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6K views45 pages

Ridge Tracing and Counting

Ridge counting and tracing involves analyzing fingerprint patterns. To count ridges, an imaginary line is drawn from the delta to the core, counting each ridge the line crosses. Ridge tracing for whorls involves tracing from the left delta to a point opposite the right delta, classifying the tracing as inner, outer, or meeting based on ridge counts inside or outside the right delta. Tracing double loops or accidentals considers the extreme deltas and stops tracing at the nearest point opposite the right delta.

Uploaded by

Gesler Pilvan Sain
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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RIDGE

C O U N T I N GA N D R I D G ET R A C I N G

Leah Moyao Donato


LEARNINGOBJECTIVES:

Understand the process of ridge counting and ridge tracing.

Conduct Ridge Tracing and Ridge Counting.


A REVIEW ON LOCA
TINGCOREAND DEL
TA
LOCATE THE DELTA
LOCATE THE CORE
WHAT IS RIDG
ECOUNTING?

• The process of counting the ridges that


touch or cross the line of count drawn
between the delta and the core of LOOP
patterns.

• A white space must always intervene


between the DELTA and the first ridge to be
counted.
STEPS IN RIDGE COUNTING
STEPS:

• To obtain a fingerprint ridge count, draw an imaginary line from the DELTA to the
CORE. Each ridge that the imaginary line crosses is then counted.
• One of the ridges must be a RECURVING RIDGE.

• Do not include the DELTA and CORE in the RIDGE COUNT.


STEPS:
• Fragments and Dots are counted as ridges only if they appear as thick as the
SURROUNDING RIDGES.
• If you cross a bifurcation, count each of its arms.
STEPS

• If the Delta is the only Loop, there is no RIDGE COUNT.


STEPS

• White space must intervene between DELTA and the FIRST RIDGE COUNT.
STEPS
• If the DELTA is above the SHOULDERS of a SINGLE LOOPING (Recurving)
RIDGE, and the CORE is on the SHOULDER, THERE is NO RIDGE COUNT
unless the imaginary line CUTS the RECURVE.
L O O P I N G R I D G EI S
A B O V ET H E D E L T A • The CORE is placed in the
CENTER of the RECURVE
provided the SHOULDERS are of
EQUAL distance from the DELTA.
IF A ROD OR SPIKE IS AS HIGH A
STHE SHOULDERS...

• The CORE is placed on the END of the ROD.


STEPS
Natural and Unnatural Breaks in the RIDGES.

The Distinction is UP to the JUDGMENT of the Individual Classifier.


ACTIVITY
RIDGE TRACING
WHORL
TRACING

• This refers to the positions


of the Deltas in the Whorl
relative to each other.
• Tracings are classified as
Inner (I), Outer (O) and
Meeting (M)
STEPS

• Trace from Left Delta to a point Opposite from Right Delta.


WHEN THERE ARE THREE (3) OR
MORE DELTA

• Trace from the farthest left delta to a point opposite the farthest right delta
DROP DOWN AT ENDING RIDGES
FOLLOW THE LOWER FORK OF A
BIFURCATION...
STOP AT THE POINT OPPOSITE TH
ERIGHT DELTA AND COUNT RIDGG
ESB/N THAT POINT AND THE DELTA
I-INNER

• If there are 3 or more ridges inside the RIGHT DELTA.


OUTER (O)

If there are 3 or more ridges


outside the RIGHT DELTA.
MEETING(M)

• If there are one or two ridges either


OUTSIDE or INSIDE the Right Delta.

• If the tracing stops on the Right Delta itself.


I TI SN O T
N E C E S S A R YT O C O U N TM O R E T H A NT H R E E
RIDGES
TRACING DOUBLE
LOOPS/ACCIDENTAL

• Problem of where to stop tracing is


sometimes presented.
• When the tracing passes inside the
RIGHT DELTA, stop at the
nearest point to the RIGHT
DELTA on the UPWARD trend.
TRACING DOUBL
ELOOPS OR
ACCIDENTAL

• If no upward trend is present,


continue tracing until a point
opposite the right delta or the
DELTA itself is reached.
ACCIDENTALS

• Often possess three or more deltas. In


tracing them, only the EXTREME deltas
are considered.

• Tracing begins at the extreme left delta


proceeding towards the extreme RIGHT
delta.
WHORL TRACINGS

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