CN101502346A - Practical convenient automatic measurement method of width and thickness dimension of human body for dress - Google Patents

Abstract

The invention relates to a practical portable method for automatically measuring the human width and thickness size for clothes, characterized in that: the human front view and side view in uniform specification can be obtained using common equipments such as camera, background plate or the like and then the human front and side image can be corrected by combining geometric correction and perspective correction. The image coordination is corrected and the true size of width and thickness of the image front and side is calculated. The used equipments are common and the price is not high and the floor area is small.

Description

The method that a kind of width and thickness dimension of human body for dress of practical convenient is measured automatically

Technical field

The present invention relates to the method that a kind of width and thickness dimension of human body for dress is measured automatically, be used for the generous size of human body is proofreaied and correct, belong to human body dimension measurement method and technology field.

Background technology

Along with developing rapidly of computer graphic image technology, mechanical automation technology, intelligent identification technology and reverse Engineering Technology etc., make dress designing, production and marketing enter automation, information age.With traditional cut the garment according to the figure different, the customized of clothes electronization sayed from application, it is a size of obtaining human body control position according to automatic measurement technology, set up personalized three-dimensional virtual human body model on computers, by network technology, select style according to the consumer, generate personalized virtual costume by the model automatic creation system, through virtual clothing effect show, Comfort Evaluation confirms its wearability, and regulate in view of the above and determine two-dimentional template, mail to the processing end and carry out product processing, finally finish sale.All processes all realize by network system, so be called the customized e-MTM (electronic-Made to Measure) of electronization.

But three-dimensional human body automatic measuring technique is the starting point of e-MTM technology since the existing three-dimensional human body automatic measuring equipment complicated operation in market, floor space big, cost an arm and a leg, hamper further developing of three-dimensional garment technology always.

Summary of the invention

The automatic method of measuring of width and thickness dimension of human body for dress that the purpose of this invention is to provide the little and moderate practical convenient of a kind of occupation area of equipment simple to operate, that use.

In order to achieve the above object, technical scheme of the present invention has provided a kind of automatic method of measuring of width and thickness dimension of human body for dress of practical convenient, it is characterized in that step is:

Step 1, obtain the people's body side surface and the direct picture of specification unanimity:

Step 1.1, with two background boards, be side background board and front background board, place on the ground mutual vertically, the center of human body is identical with distance between two background boards, be 40～60cm, on the demarcation plane of establishing a nihility according to 10cm place, human body center, the distance between this demarcation plane and the background board is 50～70cm;

Step 1.2, the center that is used to take the distance between center and the front background board of tripod of direct picture and is used to take the tripod of side image equate with distance between the background board of side, be all 250～270cm, and the prolongation at two tripod centers meet at human body in the heart, the vertical height of tripod is 110～130cm;

Step 1.3, take human body front and the side image obtain uniform specification with camera;

Step 2, to the correction that the front that obtains by step 1 and side image carry out perspective distortion and geometric distortion respectively, calculate the true generous size of human body:

Step 2.1, determine the adjustment formula of two groups of geometric corrections:

Step 2.1.1, on the described demarcation of step 1.1 plane, place a geometric correction of imagery test board, be painted with at least three concentric circles on the geometric correction of imagery test board, concentrically ringed first radius of a circle is 5～15cm, after this increases progressively 5～15cm with identical value successively;

Step 2.1.2, fall the unnecessary part of geometric correction of imagery test board by the background board trimming, make the camera lens line of centres vertically by the concentric circles center of circle, absorb side and the positive plane picture of demarcating respectively, obtain on the geometric correction of imagery test board in the image point on each circumference to the distance in the concentric circles center of circle, the point of establishing on i the circumference is d to the distance in the concentric circles center of circle _i

Step 2.1.3, derivation obtain the magnifying power K on plane, arbitrary line AB place _Z:

$K_Z=\frac{\mathrm{EF}}{\mathrm{AB}}=\frac{H}{H+Z}*{\mathrm{<figure-callout\; id="0"\; label="K"\; filenames="A200910045968E00161.png"\; state="\{\{state\}\}">K</figure-callout>}}_0,$ Wherein EF is the length of straight line AB imaging in the lens of camera, and H is the distance of the center on the described demarcation of step 1.1 plane to the camera lens center, and Z is the distance of aerial image plane to the demarcation plane, K ₀For test board center magnifying power, establish K ₀Equate with the magnifying power of first circumference, then K ₀=d ₁/ R ₁, d ₁For first circumference on the beta version image to the distance of central point, R ₁Be the distance of object test version first circumference to central point;

The correction value of the magnifying power of arbitrfary point i can be expressed as △ K in step 2.1.4, the visual field _i=K ₁-K _i, K wherein ₁Be the magnifying power of center, visual field, Ki is the magnifying power of the point on i circumference in the visual field, K ₁For testing constant as can be known, K _iValue according to the d among the step 2.1.2 _iTry to achieve according to the formula that step 2.1.3 derivation obtains;

Step 2.1.5, by statistical method fitting effect relatively, find out best approximating method, finally determine the adjustment formula of two groups of geometric corrections: △ K=f (d) and △ R=g (d).By least square method to △ K _iWith d _i, △ R _iWith d _iCarry out fitting a straight line, logarithm match, quadratic polynomial match, as the condition of judging the goodness of fit, find that the quadratic polynomial fitting effect is best with coefficient correlation,

△ K=0.00003d ²-0.00004d+0.00007, coefficient R ²=0.9973;

△ R=0.0058d ²-0.018d, coefficient R ²=0.9892,

So fixing above-mentioned adjustment formula.

Step 2.2, finish the correction of image coordinate, simultaneously the full-size(d) of positive lateral width of computed image and thickness:

Step 2.2.1, the body digital image center point coordinate of establishing shooting are 0 (x ₀, y ₀), from left to right two coordinates of width are respectively P (x on the same human body direct picture ₁, y ₁), Q (x ₂, y ₂), from left to right two coordinates of thickness are respectively R (x on the side image ₃, y ₃), S (x ₄, y ₄), then these distances of putting image center are respectively d _P, d _Q, d _R, d _S:

$d_p=\sqrt{{(x_1-x_0)}^2+{(y_1-y_0)}^2};$

$d_Q=\sqrt{{(x_2-x_0)}^2+{(y_2-y_0)}^2};$

$d_R=\sqrt{{(x_3-x_0)}^2+{(y_3-y_0)}^2};$

$d_S=\sqrt{{(x_4-x_0)}^2+{(y_4-y_0)}^2};$

Step 2.2.2, the magnifying power of establishing the test center position are K ₀, K ₀=K ₁, based on this, obtain according to two parametrization calibration model △ K=f (d) that obtain among the step 2.2.4 and △ R=g (d):

△K _P＝f(d _P)；

△K _Q＝f(d _Q)；

△K _R＝f(d _R)；

△K _S＝f(d _S)；

Step 2.2.3, establish after overcorrect P, Q, R, S point is r to the central point distance _P, r _Q, r _R, r _S, then have:

r _P＝d _P+d _P*△K _P；

r _Q＝d _Q+d _Q*△K _Q；

r _R＝d _R+d _R*△K _R；

r _S＝d _S+d _S*△K _S；

Step 2.2.4, carry out coordinates correction:

Step 2.2.4.1, the coordinate of establishing under the former coordinate system are that (x, y), the coordinate under the new coordinate system is that (X, Y), the coordinate center fixes on (x ₀, y ₀), then:

$\left\{\begin{array}{c}X=x-x_0\\ Y=y_0-y\end{array}\right.;$

Step 2.2.4.2, some P, Q, R and abscissa and the ordinate of S under new coordinate system are respectively:

Work as X〉0, Y〉0 o'clock, 0＜α＜pi/2, X _P=r _P* cos α _P, Y _P=r _P* sin α _P

As X＜0, Y〉0 o'clock ,-pi/2＜α＜0, X _Q=-r _Q* cos α _Q, Y _Q=r _Q* sin α _Q

When X＜0, Y＜0 o'clock, 0＜α＜pi/2, X _R=-r _R* cos α _R, Y _R=-r _R* sin α _R

Work as X〉0, Y＜0 o'clock ,-pi/2＜α＜0, X _S=r _S* cos α _S, Y _S=-r _S* sin α _S,

Wherein, angle [alpha] _p, α _q, α _rWith α _sPass through formula $\mathrm{\&alpha;}=\arctan \frac{y_0-y}{x-x_0}$ Try to achieve;

The correction distance D of width on step 2.2.4.3, the image _TKCorrection distance D with thickness _THFor:

$D_K=\sqrt{{(X_P-X_Q)}^2+{(Y_P-Y_Q)}^2};$

$D_H=\sqrt{{(X_R-X_S)}^2+{(Y_R-Y_S)}^2};$

Step 2.2.4.4, the distance of establishing demarcation plane described in the step 1.1 and camera lens are H, and the distance on plane, place, human body center and plane, beta version place is Z, then:

The actual thickness H of human body _H: H _H=D _H/ K _z, wherein, K _Z=H*K ₀/ (H+Z), K ₀Be known constant;

The true hip breadth K of human body _K: K _K=D _K/ K _z, wherein, K _z=H*K ₀/ (H+Z-z)), z is the distance between human body wide line and the lens place straight line, passes through z=[(x _S-x ₀)-A* (x _S-x _R)]/K _ZTry to achieve, A is known constant.

The present invention is according to the human engineering analysis, and repetition test is adjusted parameter, and the position relation of reasonable disposition beta version, background board and human body is adjusted satisfied preset parameter afterwards; By analyzing the CCD image-forming principle, set up the perspective correction model and adjust formula, by the beta version image capture is analyzed, set up geometric correction of imagery model and adjust formula, at last uniformity positive, side pickup image parameter is tested.

Advantage of the present invention is: not only can finish the correction of image coordinate, and can also the positive lateral width of computed image and the full-size(d) of thickness; The equipment that uses is comparatively common, so price is not high, and floor space is little simultaneously.

Description of drawings

Fig. 1 is a shooting environmental parameter calibration schematic diagram;

Fig. 2 is human foot's location position schematic diagram;

Fig. 3 is a human body hip circumference vertical view;

Fig. 4 is an image perspective correction imaging schematic diagram;

Fig. 5 is a geometric correction of imagery test board schematic diagram;

Fig. 6 is for proofreading and correct back coordinate calculating chart.

The specific embodiment

Specify the present invention below in conjunction with embodiment.

Embodiment

The step of the method that the width and thickness dimension of human body for dress of a kind of practical convenient provided by the invention is measured automatically is:

Step 1, obtain the people's body side surface and the direct picture of specification unanimity, according to shown in Figure 1 the shooting environmental parameter is demarcated, concrete steps are:

Step 1.1, with two background boards, be side background board and front background board, place on the ground mutual vertically, the center of human body is identical with distance between two background boards, be 50cm, on the demarcation plane of establishing a nihility according to 10cm place, human body center, the distance between this demarcation plane and the background board is 60cm;

Step 1.2, the center that is used to take the distance between center and the front background board of tripod of direct picture and is used to take the tripod of side image equate with distance between the background board of side, be all 260cm, and the prolongation at two tripod centers meet at human body in the heart, the vertical height of tripod is 120cm;

In order in the image that obtains, to obtain human body center accurately, can be according to the square scaling board ABCD of pin making that waits to take the people, O is the center of square scaling board ABCD, E, F are respectively the long mid point of pin, the edge of pin and scaling board edge are tangent, and bipod launches 45 degree.O point among this figure is human body central shaft position in the shooting environmental.Before shooting, square scaling board ABCD is attached on the ground, make the O point overlap with the human body central point.

Step 1.3, take human body front and the side image obtain uniform specification with camera, the parameter of camera can be set to: the quality of image: NORM; Image size: M; ISO sensitization: ISOAUTO; Noise reduction: ON; Release mode: remote control postpones 2S; Dynamic D-Lighting:ON; Flash Mode: AUTO; Aperture: transfer to 18mm; Focal modes: MF;

As shown in Figure 3, be human body hip circumference vertical view, in the figure, the position relation of center line MN, demarcation plane 12 and background board 34 is fixing according to system, the position of hip breadth line GH and hip depth line AE can change to some extent because of the different of the hip breadth of measuring human body and hip depth, their position can change in the relevant position translation, and center line MN then is EOF overlooking from fore-and-aft plane among Fig. 2.Human body center line MN (EOF is from fore-and-aft plane among Fig. 2) and human body hip breadth line GH do not overlap as can be seen from this figure, between human body center line MN and the human body hip breadth line GH a bit of distance is just arranged like this, this segment distance must be taken into account doing timing, because it is relevant with depth.Below just do correction at human buttock's image.

Step 2, to the correction that the front that obtains by step 1 and side image carry out perspective distortion and geometric distortion respectively, calculate the true hip breadth and the hip depth size of human body:

Step 2.1, determine the adjustment formula of two groups of geometric corrections:

Step 2.1.1, on the described demarcation of step 1.1 plane, place a geometric correction of imagery test board, geometric correction of imagery test board as shown in Figure 5, be painted with 12 concentric circles on the geometric correction of imagery test board, concentrically ringed first radius of a circle is 10cm, after this increases progressively 10cm with identical value successively;

Step 2.1.2, fall the unnecessary part of geometric correction of imagery test board by the background board trimming, make the camera lens line of centres vertically by the concentric circles center of circle, absorb side and the positive plane picture of demarcating respectively, obtain on the geometric correction of imagery test board in the image point on each circumference to the distance in the concentric circles center of circle, the point of establishing on i the circumference is d to the distance in the concentric circles center of circle _i, i=1,2 ... 11,12;

Step 2.1.3, Fig. 4 are image perspective correction imaging schematic diagram, and deriving according to Fig. 4 obtains the magnifying power K on plane, arbitrary line AB place _Z, establish the described demarcation plane P of step 1.1 _CDThe center be H to the distance of optical center, the aerial image plane is Z to the distance of demarcating the plane, AB is EF with the picture that CD becomes on lens, then can be got by geometrical relationship:

$\frac{\mathrm{CD}}{\mathrm{AB}}=\frac{H}{H+Z}$

Then: $\mathrm{AB}=\frac{H+Z}{H}*\mathrm{CD}$

EF＝CD*K ₀

Can get the magnifying power K on plane, straight line AB place _Z,

$K_Z=\frac{\mathrm{EF}}{\mathrm{AB}}=\frac{H}{H+Z}*{\mathrm{<figure-callout\; id="0"\; label="K"\; filenames="A200910045968E00161.png"\; state="\{\{state\}\}">K</figure-callout>}}_0$ , K ₀For test board center magnifying power, establish K ₀Equate with the magnifying power of first circumference, even K ₀=K ₁, K then ₀=d ₁/ R ₁, d ₁For first circumference on the beta version image to the distance of central point, R ₁Be the distance of object test version first circumference to central point;

By the principle of optical imagery as can be known, it is long that AB is the actual thing of picture EF;

The correction value of the magnifying power of arbitrfary point i can be expressed as △ K in step 2.1.4, the visual field _i=K ₁-K _i, K wherein ₁Be the magnifying power of center, visual field, Ki is the magnifying power of the point on i circumference in the visual field, K ₁Be known constant, K _iValue according to the d among the step 2.1.2 _iTry to achieve according to the formula that step 2.1.3 derivation obtains;

Step 2.1.5, by statistical method fitting effect relatively, find out best approximating method, finally determine the adjustment formula of two groups of geometric corrections: △ K=f (d) and △ R=g (d).By least square method to △ K _iWith d _i, △ R _iWith d _iCarry out fitting a straight line, logarithm match, quadratic polynomial match, as the condition of judging the goodness of fit, find that the quadratic polynomial fitting effect is best with coefficient correlation,

△ K=0.00003d ²-0.00004d+0.00007, coefficient R ²=0.9973;

△ R=0.0058d ²-0.018d, coefficient R ²=0.9892

So fixing above-mentioned adjustment formula.

Step 2.2, finish the correction of image coordinate, simultaneously the full-size(d) of positive lateral width of computed image and thickness:

Step 2.2.1, the body digital image center point coordinate of establishing shooting are 0 (x ₀, y ₀), from left to right two coordinates of hip breadth are respectively P (x on the same human body direct picture ₁, y ₁), Q (x ₂, y ₂), from left to right two coordinates of hip depth are respectively R (x on the side image ₃, y ₃), S (x ₄, y ₄), then these distances of putting image center are respectively d _P, d _Q, d _R, d _S:

$d_p=\sqrt{{(x_1-x_0)}^2+{(y_1-y_0)}^2};$

$d_Q=\sqrt{{(x_2-x_0)}^2+{(y_2-y_0)}^2};$

$d_R=\sqrt{{(x_3-x_0)}^2+{(y_3-y_0)}^2};$

$d_S=\sqrt{{(x_4-x_0)}^2+{(y_4-y_0)}^2};$

Step 2.2.2, the magnifying power of establishing the test center position are K _Ce, based on this, obtain according to two parametrization calibration model △ K=f (d) that obtain among the step 2.2.4 and △ R=g (d):

△K _P＝f(d _P)；

△K _Q＝f(d _Q)；

△K _R＝f(d _R)；

△K _S＝f(d _S)；

Step 2.2.3, establish after overcorrect P, Q, R, S point is r to the central point distance _P, r _Q, r _R, r _S, then have:

r _P＝d _P+d _P*△K _P；

r _Q＝d _Q+d _Q*△K _Q；

r _R＝d _R+d _R*△K _R；

r _S＝d _S+d _S*△K _S；

Step 2.2.4, carry out coordinates correction:

Step 2.2.4.1, be illustrated in figure 6 as and proofread and correct back coordinate calculating chart, utilize this figure to carry out coordinate transform, establish coordinate former coordinate system under for (x, y), newly the coordinate under the coordinate system is that (X, Y), the coordinate center fixes on (x ₀, y ₀), then:

$\left\{\begin{array}{c}X=x-x_0\\ Y=y_0-y\end{array}\right.;$

Step 2.2.4.2, with hip breadth, hip depth is an example, some P, Q, R and S abscissa and the ordinate under new coordinate system is respectively:

X _P＝-r _P*cosα _P，Y _P＝-r _P*sinα _P；

X _Q＝-r _Q*cosα _Q，Y _Q＝-r _Q*sinα _Q；

X _R＝r _R*cosα _R，Y _R＝-r _R*sinα _R；

X _S＝r _S*cosα _S，Y _S＝-r _S*sinα _S，

Wherein, angle [alpha] _p, α _q, α _rWith α _sPass through formula $\mathrm{\&alpha;}=\arctan \frac{y_0-y}{x-{\mathrm{<figure-callout\; id="0"\; label="x"\; filenames="A200910045968E00161.png"\; state="\{\{state\}\}">x</figure-callout>}}_0}$ Try to achieve;

The correction distance D of hip breadth on step 2.2.4.3, the image _TKCorrection distance D with hip depth _THFor:

$D_{\mathrm{TK}}=\sqrt{{(X_P-X_Q)}^2+{(Y_P-Y_Q)}^2};$

$D_{\mathrm{TH}}=\sqrt{{(X_R-X_S)}^2+{(Y_R-Y_S)}^2};$

Step 2.2.4.4, establishing the beta version described in the step 1.1, to demarcate the distance of plane and camera lens be H, and the distance on plane, place, human body center and plane, beta version place is Z, then:

The actual thickness T of human body _T: T _T=D _TH/ K _Z, wherein, K _Z=H*K ₀/ (H+Z), K ₀Be known constant;

The true hip breadth W of human body _T: W _T=D _TK/ K _z, wherein, K _z=H*K ₀/ (H+Z-z), z is the distance between human body wide line and the plane, place, human body center, passes through z=[(x _S-x ₀)-A* (x _S-x _R)]/K _ZTry to achieve, A is known constant, and this constant is 0.3815 for buttocks, and the value of this constant is respectively for chest and waist, 0.4562 and 0.5395.

Claims (1)

1. the method automatically measured of the width and thickness dimension of human body for dress of a practical convenient is characterized in that step is:

Step 1, obtain the people's body side surface and the direct picture of specification unanimity:

Step 1.1, with two background boards, be side background board and front background board, place on the ground mutual vertically, the center of human body is identical with distance between two background boards, be 40～60cm, on the demarcation plane of establishing a nihility according to 10cm place, human body center, the distance between this demarcation plane and the background board is 50～70cm;

Step 1.2, the center that is used to take the distance between center and the front background board of tripod of direct picture and is used to take the tripod of side image equate with distance between the background board of side, be all 250～270cm, and the prolongation at two tripod centers meet at human body in the heart, the vertical height of tripod is 110～130cm;

Step 1.3, take human body front and the side image obtain uniform specification with camera;

Step 2, to the correction that the front that obtains by step 1 and side image carry out perspective distortion and geometric distortion respectively, calculate the true generous size of human body:

Step 2.1, determine the adjustment formula of two groups of geometric corrections:

Step 2.1.1, on the described demarcation of step 1.1 plane, place a geometric correction of imagery test board, be painted with at least three concentric circles on the geometric correction of imagery test board, concentrically ringed first radius of a circle is 5～15cm, after this increases progressively 5～15cm with identical value successively;

Step 2.1.2, fall the unnecessary part of geometric correction of imagery test board by the background board trimming, make the camera lens line of centres vertically by the concentric circles center of circle, absorb side and the positive plane picture of demarcating respectively, obtain on the geometric correction of imagery test board in the image point on each circumference to the distance in the concentric circles center of circle, the point of establishing on i the circumference is d to the distance in the concentric circles center of circle _i

Step 2.1.3, derivation obtain the magnifying power K on plane, arbitrary line AB place _Z:

$K_Z=\frac{\mathrm{EF}}{\mathrm{AB}}=\frac{H}{H+Z}*K_0,$ Wherein EF is the length of straight line AB imaging in the lens of camera, and H is the distance of the center on the described demarcation of step 1.1 plane to the camera lens center, and Z is the distance of aerial image plane to the demarcation plane, K ₀For test board center magnifying power, establish K ₀Equate with the magnifying power of first circumference, then K ₀=d ₁/ R ₁, d ₁For first circumference on the beta version image to the distance of central point, R ₁Be the distance of object test version first circumference to central point;

The correction value of the magnifying power of arbitrfary point i can be expressed as in step 2.1.4, the visual field

△ K _i=K ₁-K _i, K wherein ₁Be the magnifying power of center, visual field, Ki is the magnifying power of the point on i circumference in the visual field, K ₁For testing constant as can be known, K _iValue according to the d among the step 2.1.2 _iAccording to step

The formula that obtains is tried to achieve 2.1.3 derive;

Step 2.1.4, by statistical method fitting effect relatively, find out best approximating method, finally determine the adjustment formula of two groups of geometric corrections: △ K=f (d) and △ R=g (d).

Step 2.3, finish the correction of image coordinate, simultaneously the full-size(d) of positive lateral width of computed image and thickness:

Step 2.3.1, the body digital image center point coordinate of establishing shooting are 0 (x ₀, y ₀), from left to right two coordinates of width are respectively P (x on the same human body direct picture ₁, y ₁), Q (x ₂, y ₂), from left to right two coordinates of thickness are respectively R (x on the side image ₃, y ₃), S (x ₄, y ₄), then these distances of putting image center are respectively d _P, d _Q, d _R, d _S:

$d_p=\sqrt{{(x_1-x_0)}^2+{(y_1-y_0)}^2};$

$d_Q=\sqrt{{(x_2-x_0)}^2+{(y_2-y_0)}^2};$

$d_R=\sqrt{{(x_3-x_0)}^2+{(y_3-y_0)}^2};$

$d_S=\sqrt{{(x_4-x_0)}^2+{(y_4-y_0)}^2};$

Step 2.3.2, the magnifying power of establishing the test center position are K _Ce, based on this, obtain according to two parametrization calibration model △ K=f (d) that obtain among the step 2.2.4 and △ R=g (d):

△K _P＝f(d _P)；

△K _Q＝f(d _Q)；

△K _R＝f(d _R)；

△K _S＝f(d _S)；

Step 2.3.3, establish after overcorrect P, Q, R, S point is r to the central point distance _P, r _Q, r _R, r _S, then have:

r _P＝d _P+d _P*△K _P；

r _Q＝d _Q+d _Q*△K _Q；

r _R＝d _R+d _R*△K _R；

r _S＝d _S+d _S*△K _S；

Step 2.3.4, carry out coordinates correction:

Step 2.3.4.1, the coordinate of establishing under the former coordinate system are that (x, y), the coordinate under the new coordinate system is that (X, Y), the coordinate center fixes on (x ₀, y ₀), then:

$\left\{\begin{array}{c}X=x-x_0\\ Y=y_0-y\end{array}\right.;$

Step 2.3.4.2, some P, Q, R and abscissa and the ordinate of S under new coordinate system are respectively:

Work as X〉0, Y〉0 o'clock, 0＜α＜pi/2, X _P=r _P* cos α _P, Y _P=r _P* sin α _P

As X＜0, Y〉0 o'clock ,-pi/2＜α＜0, X _Q=-r _Q* cos α _Q, Y _Q=r _Q* sin α _Q

When X＜0, Y＜0 o'clock, 0＜α＜pi/2, X _R=-r _R* cos α _R, Y _R=-r _R* sin α _R

Work as X〉0, Y＜0 o'clock ,-pi/2＜α＜0, X _S=r _S* cos α _S, Y _S=-r _S* sin α _S,

Wherein, angle [alpha] _p, α _q, α _rWith α _sPass through formula $\mathrm{\&alpha;}=\arctan \frac{y_0-y}{x-x_0}$ Try to achieve;

The correction distance D of width on step 2.3.4.3, the image _TKCorrection distance D with thickness _THFor:

$D_{\mathrm{TK}}=\sqrt{{(X_P-X_Q)}^2+{(Y_P-Y_Q)}^2};$

$D_{\mathrm{TH}}=\sqrt{{(X_R-X_S)}^2+{(Y_R-Y_S)}^2};$

Step 2.3.4.4, the distance of establishing demarcation plane described in the step 1.1 and camera lens are H, and the distance on plane, place, human body center and plane, camera lens place is Z, then:

The actual thickness H of human body _H: H _H=D _H/ K _Z, wherein, K _Z=H*K ₀/ (H+Z), K ₀Be known constant;

The true hip breadth K of human body _K: K _K=D _K/ K _z, wherein, K _z=H*K ₀/ (H+Z-z)), z is the distance between human body wide line and the lens place straight line, passes through z=[(x _S-x ₀)-A* (x _S-x _R)]/K _ZTry to achieve, A is known constant.

Images