CN100354595C - Ball firing system and method for identifying slow fire shot hole thereof - Google Patents

Abstract

The present invention provides a ball firing system and a method for identifying a slowly firing ball hole. The ball firing system comprises a center computer (CC), a target computer (TC), a bullet hole self-covering control device (ARU), a chest ring target projector (TPU), a target screen (TS) and a CCD camera; the method for identifying the slowly firing ball hole comprises the steps that a smaller chest ring target is intercepted from a larger target picture, a calculation zone can be reduced by using zone clustering when the ball hole is identified, the ball hole is identified by using a self-adaptive fuzzy decision function in a small zone around the ball hole, and the ring number is calculated by adopting a once-calculation and secondary-check method. The present invention can cause the ball firing system to accurately and rapidly identify a shooting result on slowly firing types and is suitable for popularization and application at all shooting playgrounds and military guard training bases.

Description

The method of the identification slow fire shell hole that ball firing system uses

Technical field

The present invention relates to army and police and athletic training automatic field, particularly ball firing system and be used to discern the method for slow fire shell hole, adopt a kind of Computer Image Processing and pattern-recognition training guidance system.

Background technology

The existing at home and abroad research of the technology that this field is relevant.The present gunnery training system that exists, major part is independent instrument, or is the one-of-a-kind system of core with the PC, only allows certain shooting result of individual is discerned.For supporting the training simultaneously of the many groups of many people, the part system has proposed based on network method, but those schemes all exist the fixed number that needs specific apparatus support thereby system cost height, target position computer, there are not shortcomings such as fault tolerant mechanism or statistical function are not strong, and also have many places that are left to be desired in the research for the recognition methods of shell hole.

ISN National Key Laboratory of communication engineering institute of Xian Electronics Science and Technology University, autograph: a kind of shooting match of image recognition that adopts is declared target system automatically---and provide a kind of new shooting sports that utilizes computer to carry out image recognition and declared target and score management system automatically.This system has adopted the method for image processing and pattern-recognition to carry out the automatic calculating of shell hole ring value, and realize that by the mechanical device that changes machine for changing target paper for shooting target sheet replaces automatically, and the achievement of many target position is added up automatically and rank realizes (computer engineering and science .2001,23 (3) .-11-14) by a LAN.This system has adopted the closed photoenvironment of special total man worker, so can only be applicable to particular environment, and normally shoots and changes a target sheet, and each is opened on target sheet and has only a shell hole at most like this, and it is slow to cause changing target figure speed; Adopt in the recognition methods original picture through conventional treatment such as filtering, geometric distortion rectification and histogram equalizations, real-time newspaper ring may can be reached for little image, then real-time is not strong for bigger image, the number of rings computer adopts is to carry out under the situation of standard target figure, do not consider distortion in images, may occur on actual the use than mistake.

Nanjing Aero-Space University's department of computer science and technology, autograph: based on the automatic scoring round target system design and the realization of image processing techniques---a kind of automatic scoring round target system by image processing techniques design and realization has been proposed.At the big characteristics of target image background color contrast, adopt a kind of image binaryzation algorithm based on the gray scale desired value, the method by progressively separating splits scoring ring from background; Count accuracy factors (nonlinear distortion of image) at influencing target, the target number is decomposed into integer and decimal two parts.Integer part is determined according to the physical significance of target image, target is counted precision can not cause any loss; Fractional part is determined (Nanjing Aero-Space University's journal, 2000,32 (6) .-691-695) according to the most inboard some relative position between two scoring rings of shell hole.This method adopts unified threshold value in the shell hole recognition methods, do not consider the influence of surround lighting and the influence of uneven illumination, also do not consider distortion in images, so number of rings also has error.

Summary of the invention

Purpose of the present invention in order to overcome the deficiency that above gunnery system exists in the shell hole recognition methods, provides a kind of ball firing system just, adopts control automatically fully, can the Real time identification shell hole, accurately calculate shooting grade.

The present invention also aims to provide described ball firing system to be used to discern the method for slow fire shell hole.

Ball firing system of the present invention comprises:

---central computer (CC) is used to control target position computer (TC) and deal with data;

---target position computer (TC), under central computer control, obtain the target position image on the target curtain (TS), carry out shell hole identification, number of rings calculating, upload achievement, and the control shell hole moves from the hole of covering of Coverage Control device (ARU);

---shell hole is used for fixing the target curtain from Coverage Control device (ARU), when receive the target position computer cover the hole signal after, make the dislocation of double-deck target sheet, cover original shell hole;

---chest silhouette target projecting apparatus (TPU) projects to chest silhouette target on the target curtain (TS), produces target figure;

---target curtain (TS): be made up of dual paper, after chest silhouette target projected to target curtain (TS), the chest silhouette target on the target curtain (TS) was the target of shooting, and the bullet land are on target curtain (TS), and the shell hole that stays is the target of shell hole pattern-recognition;

---CCD camera (CCD), link to each other with image pick-up card on the target position computer (TC), target position computer (TC) carries out process analysis by the relevant image that CCD camera (CCD) obtains on the target curtain (TS) for target position computer (TC);

Central computer (CC) and many target position computers (TC) are interconnected by network access equipment.

Described system is used to discern the method for slow fire shell hole, comprises that (1) intercepts less chest silhouette target from bigger target position figure, when (2) are discerned at shell hole, utilize region clustering, the zoning is dwindled, only in the zonule around the shell hole, discern, improve recognition speed; With adaptive fuzzy judgement function identification shell hole, strengthen the reliability of shell hole identification; (3) consider the unfavorable factor of pattern distortion and loop wire, score a target and adopted the method for one calculation and two times of check, improve the accuracy of calculating.

The method that the present invention discerns the slow fire shell hole more specifically comprises:

(1) adopt the slicing projection, from target position figure g (x, y) in intercepting chest silhouette target figure f (x, y), and definite reference center point (a, b), be about to g (x, y) respectively to X, the Y direction is carried out the slicing projection:

$f_x\left(x\right)=\underset{y=0}{\overset{\mathrm{nH}-1}{\mathrm{\Σ}}}\left\{h_x\left(y\right)\right|\mathrm{Grag}(x,y)\∈[\mathrm{\λ}\min ,\mathrm{\λ}\max ]\},x=\mathrm{0,1,2},...\mathrm{nW}-1$

$f_y\left(y\right)=\underset{y=0}{\overset{\mathrm{nW}-1}{\mathrm{\Σ}}}\left\{h_y\left(y\right)\right|\mathrm{Grag}(x,y)\∈[\mathrm{\λ}\min ,\mathrm{\λ}\max ]\},y=\mathrm{0,1,2},...\mathrm{nH}-1$

Wherein, h _y(x), h _x(y) can be the monotonic function of a constant or x, y, (x y) is target position figure gray value to Gray, and minimum threshold is λ min, and max-thresholds is λ max, and nH is that (x, height y), nW are g (x, width y) to g; From target position figure, intercept chest silhouette target according to fx (x) and fy (y) then;

(2) design is based on the adaptive fuzzy pattern-recognition fast algorithm of target position graph region cluster, algorithm is finished in two steps, the bomb-release point that first step search is possible, according to the correlation in the real-time chest silhouette target image, think that shell hole land zonule is a cluster, determine cluster areas according to the position that searches, shell hole the position difference of target, and the shape of cluster areas will change sometimes; Second step was carried out fuzzy judgement according to the fuzzy judgement function of design, the identification shell hole;

Though the distribution of pixel grey scale neither be uniform among the chest silhouette target figure, in arbitrary little zone, also have very strong similitude between the pixel, and for each bullet, the size of shell hole can be definite substantially; When shell hole drops on a certain zonule, owing to the employing front projection, the gray value of a certain pixel in the shell hole image and the average gray of zonule necessarily have a comparatively significantly difference (diminishing), set this initial testing threshold value λ ₀(suitably but should be less than normal), scanning chest silhouette target figure searches the pixel that satisfies this test threshold, identifies this pixel place with following cluster fuzzy matching method then and whether has shell hole;

If the subimage gray-scale map of shell hole on chest silhouette target figure is that (x, y), its size is m to b _b* n _b, b (x, average gray y) is B, establish cluster zonule gradation of image figure that shell hole drops on and be a (x, y), a (x, y) be with b (x, y) for the center, (x, y) (wherein comprise b (x, y)), its size is m in Da Xiao zone to comprise k+1 b _a* n _aA _iFor a (x, y) in i and b (x, the y) average gray of identical size area,

For a (x, y) (do not comprise the average gray of b (x, y)), then have:

$\stackrel{\‾}{A}=\frac{1}{m_a*n_a-m_b*n_b}[\underset{i=0}{\overset{m_a}{\mathrm{\Σ}}}\underset{j=0}{\overset{n_a}{\mathrm{\Σ}}}a(i,j)-\underset{i=0}{\overset{m_b}{\mathrm{\Σ}}}\underset{j=0}{\overset{n_b}{\mathrm{\Σ}}}b(i,j)]$

The key of shell hole pattern-recognition determines that with regard to decision algorithm the key of shell hole pattern-recognition is determined with regard to decision algorithm, each shell hole pattern-recognition, and situation all can change, thereby a fixing decision threshold can not be set, when

When higher, the average gray that shell hole and noise produce with

Difference also may be bigger than normal; When

When on the low side, the average gray that shell hole and noise produce with

Difference also may be less than normal, this variation is non-linear; Remove noise, the identification shell hole, decision threshold will be according to a (x, average gray y)

Actual conditions determine adaptively, so decision algorithm be designed to

Relevant fuzzy judgement function, decision algorithm be designed to

Relevant fuzzy judgement function;

Determine B and A _i(i=0,1 ..., k-1) be domain, so:

U＝{B，A ₀，A ₁，...A _k-1}

A:U → [0,1] u| → A (u), then design:

The degree of membership that u is under the jurisdiction of shell hole is:

$A\left(u\right)=\frac{1}{1+\frac{u}{{(\stackrel{\‾}{A}-u)}^2}}$

Determine the degree of membership decision threshold according to training sample, when reality is judged, only need to calculate the degree of membership of B, just can determine (whether x is shell hole y) to b according to following formula; If be identified as shell hole, just determine b (x, y) f (x, y) reference point in (x1, y1);

And the unified threshold determination method of template matching method or employing owing to surround lighting changes, target surface shines reasons such as irregular, can make recognition speed, discrimination reduce;

(3) adopt once calculate, the method in secondary nuclear school, described once calculating is the number of rings that goes out shell hole according to the position calculation that existing chest silhouette target (CBT) is gone up bomb-release point; Secondary nuclear school is respectively influence, the damage of elimination loop wire and the irregular influence that brings of eliminating image distortion number of rings being produced.Comprise following concrete steps:

1. determine whether shell hole is effective shell hole, effectively shell hole is in the chest ring, and the outer shell hole of chest ring is invalid shell hole.

2. put transition on the straight line of shell hole point by calculating from reference center, score a target the first time.With reference to the center of circle (a, b), when shell hole is discerned, determined the shell hole reference point (x1, y1).(a is b) with shell hole reference point (x1, definite straight line y (x) xy) or x (y) with reference to " center of circle ".

$y\left(x\right)=\frac{y1-b}{x1-a}(x-a)+b$ Or

$x\left(y\right)=\frac{x1-a}{y1-b}(y-b)+a$

The number of times that the variation of grey scale pixel value step takes place is counted, and design value is Count.Then this shell hole achievement is Result (ring):

Result＝10-(count+1)/2

3. examining for the first time the school is the influence of considering that at first distortion in images produces number of rings.If the parallel distance of CCD and target curtain is D, the angle of CCD and horizontal direction is α, obtains length and the wide W of being respectively, the H of target position image, and then the pass of the width w of pattern distortion P and picture element and height h is:

$P=\frac{\sqrt{{(\mathrm{Dtg\α}+h)}^2+D^2+w^2}}{\sqrt{D^2+w^2}}$ $w\∈[0,\frac{W}{2}],h\∈[0,H]$

Therefore, when scoring a target, carry out distortion correction according to following formula.

4. examining for the second time the school is to eliminate loop wire damage and the influence that brings lack of standardization.Carry out secondary nuclear school on original image, the enhancing of loop wire and correction are also carried out in the zonule at Zhi Yao bomb-release point place, and design had both just guaranteed the calculating accuracy like this, have guaranteed high-speed again;

Calculate if adopt directly, because distortion in images and loop wire are undesirable, can influence the accuracy of calculating, or unifiedly calculate after proofreading and correct the chest silhouette target image, the real-time of identification can descend.

The present invention compared with prior art has following advantage:

(1) can the Real time identification shell hole (every shell hole identification was finished in 0.3 second);

(1) accurately calculates (accuracy 〉=98) shooting grade;

(2) Computer Processing is avoided interference from human factor, reaches objective and fair;

(3) save the ball firing training time;

(4) replace artificial indication of shots, increase security, reduce dangerous;

(5) not resembled by environment influences, and is applicable to the training of various target ranges;

(6) system is stable.

Description of drawings

Fig. 1 is a ball firing system structured flowchart of the present invention;

Fig. 2 is used to discern the flow chart of slow fire shell hole for Fig. 1 system;

Fig. 3 is step " shell hole identification shows the newspaper ring, the uploads achievement " flow chart among Fig. 2;

Fig. 4 is the slicing projection of step among Fig. 3 " slicing projection intercepting chest silhouette target ";

Fig. 5 is the target position figure before the slicing projection among Fig. 4;

Fig. 6 is the chest silhouette target figure that the slicing projection is partitioned into from Fig. 5;

Fig. 7 among Fig. 3 step " being shell hole? " judgment basis A ( u) the degree of membership curve;

Fig. 8 is the target position figure that shell hole is arranged;

Fig. 9 is the chest silhouette target figure that shell hole is arranged;

Figure 10 is the zonule (being designated as the rectangular area) of bomb-release point cluster;

Figure 11 shows the shell hole achievement and marks shell hole.

The specific embodiment

The present invention is described further below in conjunction with accompanying drawing.

Ball firing system is the army and police's ball firing training system under the full control of computer, and ball firing system is made up of from Coverage Control device (ARU), chest silhouette target projecting apparatus (TPU), CCD camera (CCD) central computer (CC), target position computer (TC), target curtain (TS), shell hole.Target position computer (TC) and all common personal computer of central computer (CC), target curtain (TS) is for being fixed on the dual paper of shell hole on Coverage Control device (ARU), chest silhouette target projecting apparatus (TPU) is used for going up projection at target curtain (TS) and produces target figure, image on CCD camera (CCD) the extracting target curtain (TS) is for the process analysis on the target position computer (TC), and central computer (CC) and many target position computers (TC) are interconnected by TCP/IP and network access equipment.

Slow fire when target position computer (TC) receives " slow fire mode " instruction that comes from central computer (CC), shows by " red light " inaccurate shooting from covering hole automatic target-indicating ball firing training mode flow chart as shown in Figure 2; Target position computer (TC) sends from Coverage Control device (ARU) to shell hole and covers the hole signal, shell hole covers the hole from Coverage Control device (ARU), whether the hole is covered in target position computer (TC) detection up to standard, if do not have up to standard, send again and cover the hole signal,, go into the shooting wait state if up to standard, and showing " green light ", expression can be shot.Bullet hits target curtain (TS), target position are at this moment gone up at target position computer (TC) and are shown shell hole, and mark, score a target on target position computer (TC) simultaneously, and upload achievement to central computer (CC).Target position computer (TC) shows " red light ", sends to cover the hole signal, checks the hole situation of covering, if normal, shows that " green light " enters the shooting state of waiting for.

Slow fire shell hole identification block diagram as shown in Figure 3, after target position computer (TC) obtains target position figure by CCD camera (CCD), by slicing projection intercepting chest silhouette target figure, then on chest silhouette target figure, search for bomb-release point, after determining the cluster district of bomb-release point, judge whether to be shell hole, if shell hole, then calculate the shell hole number of rings, and report central computer (CC), return then and analyze the next target position figure that CCD camera (CCD) gets access to again, be not shell hole, then return continuation and on chest silhouette target, search for bomb-release point if behind the cluster district that determines bomb-release point, be judged as.

What the target position figure that obtains by CCD camera (CCD) was converted to chest silhouette target figure adopts is the slicing projection, the result of slicing projection as shown in Figure 4, as examples of implementation, accompanying drawing 5 is target position figure, the chest silhouette target figure of accompanying drawing 6 for splitting, the A that when the identification shell hole, adopts ( u) the degree of membership curve as shown in Figure 7.

The idiographic flow of certain gunnery training is as follows:

When target position computer (TC) receives " slow fire mode " instruction that comes from central computer (CC) and the gun that adopts for " the May 4th formula " pistol, show by " red light " inaccurate shooting; Target position computer (TC) sends from Coverage Control device (ARU) to shell hole and covers the hole signal, shell hole covers the hole from Coverage Control device (ARU), whether the hole is covered in target position computer (TC) detection up to standard, if do not have up to standardly, send again and cover the hole signal, if up to standard, go into the shooting wait state, shooting wait state target position figure such as Fig. 5, and show " green light ", expression can be shot.Bullet hits target curtain (TS), at this moment target position figure such as Fig. 8 that shell hole is arranged, target position computer (TC) grasps the target position figure that shell hole is arranged, slicing projection intercepting has chest silhouette target figure such as Fig. 9 of shell hole, shell hole is identified in zonule (as the rectangle region among Figure 10) identification of bomb-release point cluster, " the May 4th formula " pistol cartridge hole size is 4 * 4 pixels, the cluster areas size that then with the shell hole is the center is 20 * 20 pixels, and the average gray value of cluster areas is 165, and the average gray value of shell hole is 77, both differences are 165-77=88, the degree of membership of being calculated by (4) formula that is under the jurisdiction of shell hole is 0.9902, greater than decision threshold, is defined as shell hole, the reference position of shell hole is (366,212); Because shell hole is near the vertical direction of crossing central point, therefore, the number of times that the straight line that edge (6) formula provides calculates transition is 3 times, according to the calculating of (7) formula with through behind the nuclear school, calculating number of rings is 8 rings, goes up demonstration shell hole achievement at target position computer (TC), and mark shell hole, as Figure 11, on target position computer (TC), score a target simultaneously, and upload achievement to central computer (CC).Target position computer (TC) shows " red light ", sends to cover the hole signal, checks the hole situation of covering, if normal, shows that " green light " enters the shooting state of waiting for.

By test, the technical indicator of system of the present invention is as follows:

(1) target position figure: 640 * 480 * 24BMP;

(2) running environment: windows98, windows2000;

(3) recognition speed: PIII/733MHz/128M 0.3 second;

(4) recognition correct rate: slow fire 〉=99%;

(5) Range Environment: indoor, or covering is arranged above outdoor target curtain and the projecting apparatus place.

Claims (4)

1, a kind of method of identification slow fire shell hole of ball firing system use is characterized in that comprising:

(1) the less chest silhouette target of intercepting from bigger target position figure;

(2) when shell hole is discerned, utilize region clustering, the zoning is dwindled, in the zonule around the shell hole, discern shell hole with adaptive fuzzy judgement function;

(3) score a target and adopt the method for one calculation and two times of check;

Described ball firing system comprises:

---central computer (CC) is used to control target position computer (TC) and deal with data;

---target position computer (TC), under central computer control, obtain the target position image on the target curtain (TS), carry out shell hole identification, number of rings calculating, upload achievement, and the control shell hole moves from the hole of covering of Coverage Control device (ARU);

---shell hole is from Coverage Control device (ARU), when receive the target position computer cover the hole signal after, make double-deck target sheet dislocation, cover original shell hole; While fixed target curtain;

---chest silhouette target projecting apparatus (TPU), chest silhouette target is projected on the target curtain (TS), produce target figure;

---target curtain (TS): be made up of dual paper, after chest silhouette target projected to target curtain (TS), the chest silhouette target on the target curtain (TS) was the target of shooting, and the bullet land are on target curtain (TS), and the shell hole that stays is the target of shell hole pattern-recognition;

---CCD camera (CCD), link to each other with image pick-up card on the target position computer (TC), target position computer (TC) carries out process analysis by the relevant image that CCD camera (CCD) obtains on the target curtain (TS) for target position computer (TC);

Central computer (CC) and many target position computers (TC) are interconnected by network access equipment.

2, the method for identification slow fire shell hole according to claim 1 is characterized in that adopting the slicing projection, from target position figure g (x in (1) step, intercepting chest silhouette target figure f y) (x, y), and definite reference center point (a, b), be about to g (x, y) respectively to X, the Y direction is carried out the slicing projection:

$f_x\left(x\right)=\underset{y=0}{\overset{\mathrm{nH}-1}{\mathrm{\Σ}}}\left\{h_x\left(y\right)\right|\mathrm{Gray}(x,y)\∈[\mathrm{\λ}\min ,\mathrm{\λ}\max ]\},x=\mathrm{0,1,2},...\mathrm{nW}-1$

$f_y\left(y\right)=\underset{x=0}{\overset{\mathrm{nW}-1}{\mathrm{\Σ}}}\left\{h_y\left(x\right)\right|\mathrm{Gray}(x,y)\∈[\mathrm{\λ}\min ,\mathrm{\λ}\max ]\},y=\mathrm{0,1,2},...\mathrm{nH}-1$

Wherein, h _y(x), h _x(y) can be the monotonic function of a constant or x, y, (x y) is target position figure gray value to Gray, and minimum threshold is λ min, and max-thresholds is λ max, and nH is that (x, height y), nW are g (x, width y) to g; Then according to f _x(x) and f _y(y) from target position figure, intercept out chest silhouette target;

In (2) step, search for possible bomb-release point, according to the correlation in the real-time chest silhouette target image, think that shell hole land zonule is a cluster, determine cluster areas according to the position that searches, shell hole the position difference of target, and the shape of cluster areas will change sometimes; According to the fuzzy judgement function, carry out fuzzy judgement, the identification shell hole;

In (3) step, described once calculating is the number of rings that goes out shell hole according to the position calculation that existing chest silhouette target (CBT) is gone up bomb-release point; Secondary nuclear school is respectively influence, the damage of elimination loop wire and the irregular influence that brings of eliminating image distortion number of rings being produced.

3, the method for identification slow fire shell hole according to claim 2 is characterized in that establishing the subimage gray-scale map of shell hole on chest silhouette target figure is that (x, y), its size is m to b in (2) step _b* n _b, b (x, average gray y) is B, establish cluster zonule gradation of image figure that shell hole drops on and be a (x, y), a (x, y) be with b (x, y) for the center, (x, y) (its size is m for x, y) Da Xiao zone at an interior k+1 b to comprise b _a* n _aA _iFor a (x, y) in i and b (x, the y) average gray of identical size area, For a (x, do not comprise in y) b (x, average gray y) then has:

$\stackrel{\‾}{A}=\frac{1}{m_a*n_a-m_b*n_b}[\underset{i=0}{\overset{m_a}{\mathrm{\Σ}}}\underset{j=0}{\overset{n_a}{\mathrm{\Σ}}}a(i,j)-\underset{i=0}{\overset{m_b}{\mathrm{\Σ}}}\underset{j=0}{\overset{n_b}{\mathrm{\Σ}}}b(i,j)],$

Decision algorithm be designed to

Relevant fuzzy judgement function; Determine B and A _i(i=0,1 ..., k-1) be domain, so:

U＝{B，A ₀，A ₁，...A _k-1}

A:U---＞[0,1] u|---＞A (u), then design:

The degree of membership that u is under the jurisdiction of shell hole is:

$A\left(u\right)=\frac{1}{1+\frac{u}{{(\stackrel{\‾}{A}-u)}^2}}---\left(4\right)$

Determine the degree of membership decision threshold according to training sample, when reality is judged, only need to calculate the degree of membership of B, just can determine (whether x is shell hole y) to b according to following formula; If be identified as shell hole, just determine b (x, y) f (x, y) reference point in (x1, y1).

4, the method for identification slow fire shell hole according to claim 2 is characterized in that comprising the steps: in (3) step

1. determine whether shell hole is effective shell hole, effectively shell hole is in the chest ring, and the outer shell hole of chest ring is invalid shell hole;

2. put transition on the straight line of shell hole point by calculating from reference center, score a target the first time; With reference to the center of circle (a, b), when shell hole is discerned, determined the shell hole reference point (x1, y1); (a is b) with shell hole reference point (x1, definite straight line y (x) xy) or x (y) with reference to " center of circle ";

$y\left(x\right)=\frac{y1-b}{x1-a}(x-a)+b$ Or

$x\left(y\right)=\frac{x1-a}{y1-b}(y-b)+a$

The number of times that the variation of grey scale pixel value step takes place is counted, and design value is Count; Then this shell hole achievement is ring (Result):

Result＝10-(count+1)/2

3. examining for the first time the school is the influence of considering that at first distortion in images produces number of rings.If CCD camera (CCD) is D with the parallel distance of target curtain (TS), CCD camera (CCD) is α with the angle of horizontal direction, obtains length and the wide W of being respectively, the H of target position image, and then the pass of the width w of pattern distortion P and picture element and height h is:

$P=\frac{\sqrt{{(\mathrm{Dtg\α}+h)}^2+D^2+w^2}}{\sqrt{D^2+w^2}}$

Therefore, when scoring a target, carry out distortion correction according to following formula;

4. examining for the second time the school is to eliminate loop wire damage and the influence that brings lack of standardization; Carry out secondary nuclear school on original image, the enhancing of loop wire and correction are also carried out in the zonule at Zhi Yao bomb-release point place, and design had both just guaranteed the calculating accuracy like this, have guaranteed high-speed again.

Images