Henry’s 10 digit classification of fingerprint

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1. Henry’s 10 digit classification of fingerprint -by shruti Khairnar Volunteer at afrs https://tse1.mm.bing.net/th?id=OIP.gbqqsLLwXQO4JH2R3VkN1wHaFj&pid=Api&P=0

2. Content Introduction Primary classification Secondary classification Sub secondary classification Final classification Complete representation Reference

3. Introduction Sir Edward Henry made the official introduction of an use fingerprint for criminal identification. In 1986 ,he developed a fingerprint classification system; but, it is also said that he covertly gave his name to the classification system worked out by his Indian employees Khan Bahadur Azizul Haque and Rai Bahadur Hem Chandra Bose . The Henry’s System consisted of 4 major classification: Primary classification Secondary classification Sub secondary classification Final classification

4. Primary classification: In this classification, numerical value of the finger with the whorl pattern are considered. This values are as follows: Right thumb=16 Left thumb=4 Right index =16 Left Index =2 Right middle =8 Left middle=2 Right ring=8 Left ring =1 Right little =4 Left little=1 For the patterns other than whorl, such as, arch and loop, value is assigned as null(0). Once values are assigned, the values of even numbered fingers must be written in numerator and odd in denominator. Then add this value and add 1 to both numerator and denominator.

5. Secondary classification In this classification, we have to consider the index finger of both hands. According to the pattern present on the finger, the alphabetic value is assigned to it. They are, Plain arch=A Tented arch=T Ulnar loop=U Radial loop=R Whorl=W Value of Right index finger should be written on the numerator and that of left index on denominator.

6. sub secondary classification: In this classification, we consider the value of index, middle and ring fingers of both the hands. Alphabetic values are assigned for loop and whorl pattern, whereas, null(0) value for others. Ridge tracing is done for whorl pattern and ridge counting is done for loop pattern. Ridge count value for loop pattern: Finger Ridge count denoted as I Ridge count denoted as O Index 1-9 10 or more Middle 1-10 11 or more Ring 1-11 12 or more Ridge tracing value is given to the whorl pattern based on the ridge count between the right delta and the tracing end. The ridge tracing value is I if the tracing end is inside the right delta and value of ridge count is 3 or more; M if less than 3 ridges inside or outside delta and O if more than 3 or 3 ridges outside the delta. Then the values of right fingers are placed in numerator and left in denominator.

7. Final classification In this classification, only little fingers of both the hands are considered . Loop and whorls pattern are assigned with the ridge count values , and the rest others are given null(0) value. For loop pattern, Ridge counting is done by using the general rules , whereas for doing ridge counting in whorl pattern for left hand the right delta is considered and for right hand is vice versa. After getting the values, the value of right little finger is placed in numerator and that of left little in denominator.

8. Complete representation Henry’s classification is as follow:

9. References 1. Fingerprints: analysis and understanding by Mark K. Hawthorne. 2. Studylin.net

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