A Human Body Mathematical Model Biometric Using Golden Ratio: A New Algorithm A Human Body Mathematical Model Biometric Using Golden Ratio: A New Algorithm

This research provides more than 35 measurements rules derived from the perspectives of Vitruvian Man and Neufert and their basis of the golden proportion, to build a human body model on computers for the use of multimedia. The measurements are based on 25 proportional rules derived from 15 proportions given by Vitruvian Man and 29 golden proportions in Bauentwurfslehre by Ernst Neufert. Furthermore, the research will suggest two algorithms to calculate the 67 measurements with precision; assuming that the algorithms output will be used as guideline to human body modelers in simulation, gaming, plastic surgery, as well as the world of biometrics or wherever human body measurements and calculations is needed like prosthetic limbs, spatial design, and machine learning of human biometrics. Furthermore, building proportional models creates visual harmony in measurements and visual parity model. Hence, the chapter facilitates and explains for the human modeler the process of human modeling from within an algorithm. This research is an expanded work based on two published conference papers listed in the references section.


Introduction
This research is based on two published papers [16,17] pertaining to same subject by the same author. The research identifies more than 35 measurements and proportions to be used in modeling a human body on computers. The 35 measurements rules are based on Vitruvian Man and Neufert descriptions of Bauentwurfslehre by Ernst Neufert [20] and Leonardo da Golden Section (goldene Schnitt) by a German mathematician named Martin Ohm who lived from 1792 till 1872. Mark Barr coined the term (phi) to reflect the idea of Golden ratio, in commemoration of Phidias, because many historians [7,13] claim that Phidias used the Golden Ratio in his sculptures.
Simply, Golden Ratio is a proportion of two unequal segments: the proportion of the long segment to the short segment is equal to the total of the two segments to the long segment, both equal 1:1.61803398874989. In Figure 1, the longer segment a and the short segment b, whereby the proportion of a:b is equal to the total of a and b to a. The number 1.61803398874989 is the value of phi. In this context, the ensuing question is how to derive b from a while keeping the Golden Proportion, phi?
To derive the b segment from the a segment, the following must be conducted: First, draw a square with length a, as articulated in Figure 2, and construct a unit square. Then, at midpoint on the side of the square, draw a line to the opposite side. Next, connect the midpoint to an opposite corner. When using that line as the radius to draw an arc, accordingly, the long dimension of the rectangle is defined.
The simpler picture is reflected in Figure 3 where the "a" and the "b" are shown and the both hold the value of phi, the Golden proportion.
Concluding the section where the origin of the term Golden Ratio was not only clarified but thorough explanation of the geometrical aspect of the ratio was also put forward, in order to comprehend the magnitude of this proportion.

The mathematics of golden ratio: Fibonacci series
In view that understanding the golden ratio mathematics is imminent, especially when it is reflected in the Fibonacci Series [2]. Another perspective is the how the golden ration interrelates with the square root of 5. The two perspectives are clarified in the next paragraphs. Accordingly, this section will discuss the mathematical properties of golden ratio (Phi), especially in Fibonacci series, while noting that phi with small letter p is equal to 1.618033988749895, whereas Phi with capital P equals 0.618033988749895.
Fibonacci series, named after Leonardo Fibonacci, is a simple series that when starting with 0 and 1, each new number in the series is simply the sum of the two before it. The ratio of each successive pair of numbers in the series approximates phi (1.618). In fact, after the 40th number in the series, the ratio is accurate to 15 decimal places. Furthermore, the value of golden ratio (phi) is reciprocal to the value of golden ratio (Phi), noting that the ratios of the successive numbers in the Fibonacci series quickly converge on golden ratio (Phi), the ratio is accurate to 15 decimal places: For example, the 40th number in the Fibonacci series is 102,334,155, which can be computed as ( Table 1): Concluding this section, where the mathematical perspective of the Golden Ratio was illustrated through the Fibonacci Series and the relationship of the successive elements of the series that converge to the golden ratio.

Vitruvian man
Proportions used to model, paint, and sculpt a human body are essential, as [18] Luca Pacioli, a contemporary of Da Vinci, indicates that "without mathematics there is no art," proportions are an integral part of design and beauty of nature, to achieve beauty, balance, and harmony, thereby presenting visual parity to the audience. According to [9], such use of proportion creates the greatest harmony in the symmetrical relations.  [12]. Marcus Vitruvius Pollio wrote his work On Architecture in 25 BC. In his book, he stated that human body and a perfect building are similar [1]. Furthermore, the use of proportion in buildings, paintings, and sculpting is not a new idea so is the use of human body proportions in buildings.
Leonardo da Vinci developed 15 proportion rules used to model a human in his work named VITRUVIAN MAN. The famous proportions were written underneath the illustration shown in Figure 4. The rules are further explained in Figure 5 and in the list of proportions shown at the end of this section.
The first rule is that the length of a man is equal to the width of a man with both arms extended. Hence, a man can be inscribed in a square, as seen in Figure 4. A man can be inscribed in circle where the extended arms while raised to the level of the head and both feet are on the circumstance of the circle, as seen in Figure 4.
The second rule is for the proportion of the face which is 1/10 of the man height. The third rule is for the head proportion which is 1/8 of man height. The fourth and fifth rules, from the chest to the hair line is 1/7-man height, and from chest to the head is 1/6-man height. The sixth rule pertains to the shoulders width, which is ¼ of man height. The seventh rule measures the distance from breast to the top of the head and the proportion is ¼ of the man height, noting that measurements from the rule 6 and 7 correlate. Rules 8-10 all relate to forearm, upper arm, and hand which are ¼, 1/8, and 1/10 height of a man, respectively. It is worthwhile to note that the aforementioned three rules on measurement of forearm, shoulders width correlate with rule 7. Rule 11 is the measure of half the man, from the root of the penis to the top of the head or the root of the penis to the sole of the feet is ½ of man height. Rules 12-14 pertain to foot leg and thigh. The foot is 1/6 of man height while the leg and thigh are both equal to ¼ of man height. The last rule explains proportions used in the face which divides the face to threethirds: one-third from hair line to eyebrows, second third from eyebrows to below nose, and from below the nose to end of chin. The last rule, pertaining to face proportions will be thoroughly discussed in Section 6 of this chapter. The original quote from Leonardo da Vinci work is in the research [16,17].
In short, [5], the following table summarized the previous quote as illustrated in Figure 5.
1. The length of the outspread arms is equal to the height of a man.

2.
Face: from the hairline to the bottom of the chin is 1/10 of the height of a man.

3.
Head: from below the chin to the top of the head is 1/8 of the height of a man.

4.
From above the chest to the top of the head is 1/6 of the height of a man.

5.
From above the chest to the hairline is 1/7 of the height of a man.
6. Shoulders: the maximum width of the shoulders is ¼ of the height of a man.

7.
From the breasts to the top of the head is ¼ of the height of a man.

Forearm:
The distance from the elbow to the tip of the hand is ¼ of the height of a man.

9.
Upper arm: the distance from the elbow to the armpit is 1/8 of the height of a man.

10.
Hand: the length of the hand is 1/10 of the height of a man.
11. The root of the penis is at 1/2 the height of a man.

12.
Foot: is 1/6 of the height of a man.
13. Leg: from below the foot to below the knee is ¼ of the height of a man.
14. Thigh: from below the knee to the root of the penis is ¼ of the height of a man.

15.
Face: the distances from the below the chin to the nose and the eyebrows and the hairline are equal to the ears and to 1/3 of the face.
In closing, this section attempted to shed light on the significance of using the divine proportions in design, beauty, and parity. Famous and profound painters, designers over the centuries have been influenced to use proportion when painting and sculpting human body; in this context, 15 proportional rules used by Leonardo da Vinci in drawing the Vitruvian Man was explicitly discussed, noting that proportion use was extended to be used in architecture and by architects like Marcus Vitruvius Pollio, which will be further discussed next. As such, proportion use in art is equally profound and archaic.

Bauentwurfslehre by Ernst Neufert
Bauentwurfslehre is a German word means Architects' Data a book authored by Ernst Neufert a German engineer. Architects' Data is reference book for spatial requirements. The author developed the book based on the previous work of Leonardo da Vinci with golden ratio proportions. In this section, the work of Bauentwurfslehre by Ernst Neufert is first explained. Then 29 proportional rules are derived to further the work of the algorithm that is being developed to provide 35 measures that helps building a human model.
The Bauentwurfslehre shown in Figure 6 is the composed of 29 proportional measurements, named m (in small letter) and M (capital letter) used on a human model. Also, there are 12 circles to derive the proportions. Both the circles and the proportions will be explained in the next paragraphs.
The 12 circles are numbered to explain each and differentiate one from the other. To build the model in Figure 6, the following steps are done: (1) a square is sketched with height of the man as the height of the square as well as the width; (2) two lines are sketched from opposite corners to locate the center of the first circle (the biggest circle); (3) a second circle is drawn with center is the navel and the radius is extended from navel to perpendicular line drawn from hand rest to ground; (4) a third circle is sketched with the navel as the center, and the radius is distance from navel to perpendicular line extended from elbow to ground; (5) a fourth circle is drawn with the navel as center and the radius from navel to the outer side of the arm; (6) a fifth circle is drawn with the center is mid-chest center, with radius outer arms; (7) a sixth circle is centered in the throat and the radius from throat to the line extended from shoulder to the ground; (8) a seventh circle is sketched with center in mid thighs and the radius is the outer side of the thigh; (9) an eighth circle is sketched and centered in the is mid-chest center, with radius inside arms.; (10) a ninth circle is sketched and centered in the navel and the radius is the sides of the middle section; (11) a tenth circle is drawn and centered in the point between the eyes and the radius is the sides of the face (temples); (12) the eleventh circle is drawn and centered to touch the seventh circle while reducing the radius to the outer side of the legs, below the knee, and finally (13) the twelfth circle is sketched similar to circle 11 while touching the second circle.
To explain the golden ratio from within the 29 measurements little m and big M, one must start with explaining the base case M16. The measurement M16 is measured from bottom of foot to foot end (see Figure 7). M17 is derived according to the golden ratio rule seen in (1): Furthermore, M7 is the total of both M16 and M17 [see (2)]. In addition, M7 is used to derive M8 according to golden ratio rule as illustrated in Eq. (3). Note that the upper limit of M8 is below the knee and it is the tangent of both circles 12 and 2 (see Figure 6). Also, note that M3 is the total of M7 and M8 as seen in Eq. (4): Again, M18 is the measure of the knee, below knee to above the knee. The M18 is used to derive M19 according to rule in Eq. (5). The upper limit of M19 is the center of circle 7 and tangent to circle 3 also, if a line drawn with the hand extended on the sides. In addition, note that M9 is the total of M18 and M19 see (6): The M9 is used to derive M11 = M9 Â 1.61803398874989. The M20 is the measure of length of the hand (tip of figure to rest). The M20 is used to derive M21 according to golden ratio rule in (7). The upper limit of M20 and the lower limit of M21 is tangent to circles 7 and 4 (see Figure 6). The upper limit of M21 is tangent to circle 8 and the center of circle 9 and crosses the navel: The upper limit of M11 is tangent to circle 8 and the center of circle 9 and crosses the navel. And M11 is the addition of M20 and M21 (see Figure 6). M11 is driven from M9 according to rule in Figure 3: The upper limit of M4 is tangent to circle 8 and the center of circle 9 and crosses the navel. M4 is the addition of M9 and M11 (see Figure 6). Also, M4 is driven according to rules explained in Figure 3 and as seen in (9): Once you reach the navel, one can easily calculate M2 According to (12). The M27 is from top of the head to hair line tip. The M27 is used to derive M26 according to rules explained in Figure 3. The lower limit of M27 is tangent to circle 10, while the lower limit of M26 is tangent to circle 6 and crosses the center of circle 10 (see Figure 6). Again, to derive M26 apply: According to (13), the M2 is the addition of M6 and M5. Hence, both M6 and M5 can be driven from M2 according to (14) and (15). The upper limit of M2 is tangent for circles 1 and 2. The M2 lower limit crosses center of circle 9 which is the navel (see Figure 6).
The M6 is from the base of the throat to the top of the head. Since M6 is the total of M14 and M15 according to (16). Hence, M14, and M15 can be driven according to (17) and (18): The M5 is from the navel to the throat, the upper limit of M5 is same level as center of circle 6. Since M5 is the total of M13 and M12 according to (16). Hence, M12, and M13 can be driven according to (20) and (21): The M12 is from the navel to rib cage, the upper limit of M12 is same level as tangent to of circle 4. Since M12 is the total of M23 and M22 according to (22). Hence, M22, and M23 can be driven according to (23) and (24): The M15 is from eyebrows to top of the head, the upper limit of M12 is same level as tangent to of circle 6. Since M12 is the total of M27 and M26 according to (25). Hence, M26, and M27 can be driven according to (26) and (27): The M14 is from the throat to eyebrows. M14 is tangent to circles 3 and 5 while the upper limit is tangent to circle 6. Note that, M14 is the addition of M24 and M25, and is derived according (29) and (30): The M24 upper limit will be tangent to circle 10 and the lower limit is tangent to circle 5. M24 is tangent to circles 3 and 5 while the upper limit is tangent to circle 6. Note that, M24 is the addition of M29 and M28, and is derived according (32) and (33): This section explained 29 proportions and 12 circles used in Bauentwurfslehre by Ernst Neufert. The section first explained the work which is based on Leonardo da Vinci with golden ratio proportions. Then the research explained each circle's radius and center. Next, the research explained each proportion and how to calculate each ratio from M1 to M29. The findings of this section will be reflected in the algorithm suggested in Section 7 of this research. The next section will discuss the golden proportions used to model a human face and hands.

Face and hand proportions
The golden proportion is repeated in the human face and is used by plastic surgeons to follow as guidelines. Human face from the bottom of the chin to the hairline in length to the edge of the eyebrow is 1:1.618 or 1: φ as illustrated in Figure 12, the red rectangle. Likewise, proportion is illustrated in the same figure using the green rectangle; the green rectangle is edges of the eyebrows and the height is from the tip of the nose to the top of the eyebrows. The third golden proportion is seen in the blue rectangle. The blue rectangle extends from the eyebrow to the bottom lip, and from the space between the eyes to the end of the eyebrow. Based on the previous one can calculate the width of the face to equal 1: length of the face. The length of the face = M26 + M25 + M29 and the length of the green box equals M25 and the length of the blue rectangle is 2 Â M25. Once the length is calculated, then the width can be easily calculated ( Figure 8). Gary Meisner [19] lists seven vertical golden proportions in the face and eight horizontal golden proportions. Next, the 15 proportions will be described based on Meisner's guide to beauty. The seven vertical golden proportions are: center of pupils to bottom of chin the golden ratio point is at center of lips, center of pupils to bottom of chin the golden ratio point is at nose at nostrils, center of pupils to nose base the golden ratio point is at nose flair top, top arc of eyebrows to bottom of eyes the golden ratio point is at top of eyes, center of pupils to center of lips the golden ratio point is at nose at nostrils, top of lips to bottom of lips the golden ratio point is at center of lips, nose at nostrils to center of lips the golden ratio point is at top of lips. Eight horizontal golden proportions are: side of face to opposite side of face, the golden ratio point is at inside of near eye; side of face to inside of opposite eye, the golden ratio point is at inside of near eye; center of face to side of face, the golden ratio point is at outside edge of eye; side of face to inside edge of eye, the golden ratio point is at outside edge of eye; side of face to outside edge of eye, the golden ratio point is at outside of eyebrow; center of face to width of mouth, the golden ratio point is at width of nose; side of mouth to opposite side of mouth, the golden ratio point is at cupid's bow. Meisner designated 33 points on human face as seen in [19], such points can be driven from the derived rules in Figure 9, 618. According to the previous 12 golden ratio rules were derived to the face vertically. Next, the same will be conducted to derive more rules horizontally. Again, since the height of the face is known, one can derive seven golden ratio rules according to Meisner [19].   The previous two paragraphs enhance the two algorithms suggested in Figures 9 and 10 with more than 33 features that can be used in modeling a human face. The features are reflected as a continuum to the first algorithm in Figure 11.  Figure 11. Human face segmentation a continuum from Figure 10.
the figure to the first knuckles (distal phalange) is proportional to the second knuckle (middle phalange) 1: φ, which is equally similar to middle finger, ring finger, and little finger. The thumb from the tip to the (distal phalange) proportional to the proximal phalange is 1: φ and to the joint connecting the hand is 1: φ 2 as shown in Figure 10.

Build a human body using golden ratio and suggested algorithm
This section presents two suggested algorithms that calculate all 35 measurements of the human model. The first algorithm shown in Figure 9 where the input needed is the value of M16. The second algorithm also provides the model with 35 measurements according to golden ratio rules, with the input of the algorithm is the total height of the model. The author experimented with both algorithms and reflected the results in Tables 2 and 3. Furthermore, the results are shown on the model in Figure 12. The first suggested algorithm is explained next.
To build a human model according to the golden ratio using the rules explained above and suggested in Figure 6 Bauentwurfslehre by Ernst Neufert, two algorithms are devised in Figures 9 and 10 that would position the rules as shown next.
First, enter the one basic measurement which is M16 (the length from bottom of feet to ankle). Using the fact implied by formula (1) which is previously explained. Then M17 can be calculated by setting M17 = M16 Â 1.61803398874989. Once M17 is calculated, then M7 can be easily determined by using the previously explained formula (2). Furthermore, M8 can be calculated since such fact was established by formula ( Another version of the algorithm can be suggested when the total height is given, as illustrated in Figure 10. The author used a simple Microsoft Excel sheet to calculate the rest by applying the same rules seen in  Table 3. Proportions and heights as suggested by Vitruvian man model and reflect in Figure 12. numbers were reflected on the same Figure 10, while it is worth noting that some interesting facts were realized and seen in Table 2 as follows: first, M28 and M26 are equal to each other;  second, M16, M25, M27, M29 are equal; and third, M15, M17, M18, M23, M24 are equal. Again,  M7, M13, M14, M19, M20, M22 are all equal to each other. In addition, M21, M8, M9, M6, M12 are equal to M8 are equal to each other. And M3, M5, and M11 are equal to each other. Finally, M4 and M2 are equal to each other. Hence, the suggested algorithm can be done with minimum line of code as shown in Figure 8: To build a human body using proportions suggested by Vitruvian Man discussed in the earlier section, then the height intended for the human figure should be designated first (shown in Figure 12). As illustrated by Table 3, the height entered was 178 cm, whereby using simple calculations, the results are shown in Table 3.

Conclusion
The goal of this chapter was to enable a multimedia modeler to model a human body using the golden ratio. Hence, the research uncovers 35 measures based on golden ratio introduced by Bauentwurfslehre by Ernst Neufert (1936) and First, the chapter explained the golden section (mathematically, geometrically, arithmetically), then further demonstrated the golden ratio with phi. Furthermore, the chapter discussed Vitruvian Man (The Man in Action) by Leonardo da Vinci. Furthermore, explained Bauentwurfslehre by Ernst Neufert. The chapter, then, proposed how to build a human model using the ratios explained and proposed two algorithms that a modeler can follow to build a human body. The algorithms output can be used as proportions and an integral part of design and beauty of nature, to achieve beauty, balance, and harmony, thereby presenting visual parity serving guideline to human body modelers in simulation, gaming, plastic surgery, as well as the world of biometrics or wherever human body measurements and calculations is needed like prosthetic limbs, spatial design, and machine learning of human biometrics. As such, the chapter facilitated and explained for the human modeler, the process of human modeling in multimedia arena. Hence, this research will be a spring board for researchers and practitioners in human modeling in multimedia field.