Method and means for visual control of the ball hitting the playing field border

FIELD: visual control.

SUBSTANCE: invention relates to the method and means for visual control of the ball hitting the playing field border. This technical result is achieved due to the fact that in the method of visual control of the ball hitting the playing field border the grooves, which are approximately equal to half the diameter of the ball or more, are placed at the border outside the playing field and are filled flush with the surface of the playing field with a mixture of plastic matter and loose material in the ratio that provides the appearance of the print of the ball used when it hits the surface of the filled groove.

EFFECT: invention ensures the accuracy of visual control by relatively simple and inexpensive means.

16 cl, 2 dwg

 

The technical field to which the invention relates.

This invention relates to method and means for providing visual inspection of hitting the ball on the boundary of the playing field.

The level of technology

In sports such as tennis and volleyball, there is an acute problem of accurately determining hits or misses the ball on the boundary of the playing field. Often the outcome of the game depends on the point whether the judge hit the ball inside the boundary of the playing field or outside this boundary ("out").

Currently, there is a very complicated and expensive Hawkeye system for visual inspection of hitting the ball on the boundary of the playing field using ten cameras placed around the playing field and conducting ongoing monitoring of rebound of the ball. Each of the cameras controls half the territory and sends your video to your own computer in the control center. There are four computer bring together all the threads of information that are processed by a special detection algorithm to determine whether a touch if the ball from the playing field or hit outside its borders (http://news.students.ru/index.php?newsid=2319). However, the presence of inevitable parallax due to the different angles of reading images from different cameras leads in some cases to errors in computing the score, and the inability of the La judge visually check this estimate reduces its reliability.

Disclosure of inventions

The present invention is to provide such a method of providing visual inspection of hitting the ball on the boundary of the playing field and, accordingly, such funds to provide visual control of hitting the ball on the boundary of the playing field, which would guarantee the accuracy of visual inspection, being at the same time quite simple and inexpensive.

To solve this problem and achieve the technical result in the first object of the present invention, a method for providing visual inspection of hitting the ball on the boundary of the playing field, which is placed on the outside border of the playing field grooves of a width approximately equal to half the diameter of the above-mentioned ball or more, and fill the groove flush with the surface of the playing field with a mixture of the plastic substance and bulk materials in a ratio that provides the appearance of the imprint of the ball when it hits the surface of the groove.

Feature of the method according to the present invention is that as the plastic substance can choose clay, and as the bulk substance can choose the sand. The ratio of clay and sand can choose by weight in the range from about 30:70 to about 70:30.

Another feature of the method according to the present invention, h is the groove can be made with a semicircular cross-section, rectangular or trapezoidal shape.

Another feature of the method according to the present invention is that the playing field is a tennis court, and the ball is a tennis ball, or playing field is a volleyball court, and the ball is a volleyball ball.

To solve the problem and achieve the same technical result in the second object of the present invention proposed a means to provide visual control of hitting the ball on the boundary of the playing field, containing grooves placed on the outside border of the playing field with a width approximately equal to half the diameter of the above-mentioned ball or more, and filled flush with the surface of the playing field with a mixture of the plastic substance and bulk materials in a ratio that provides the appearance of the imprint of the ball when it hits the surface of the filled grooves.

Feature of the tool of the present invention is that as the plastic substance may be chosen from the clay, and as the bulk of the substance can be selected sand. The ratio of clay and sand can be selected by weight in the range from about 30:70 to about 70:30.

Another feature of the tool of the present invention is that the groove can be made with a cross section of a semicircular, rectangular or trapezoidal the sixth form.

Another feature of the tool of the present invention is that the playing field is a tennis court, and the ball is a tennis ball, or playing field is a volleyball court, and the ball is a volleyball ball.

Brief description of drawings

The invention is explained further with the aid of drawings, in which identical elements are labeled with the same reference position. Figure 1 shows a notional view of the playing area. Figure 2 shows the cross-section of the groove at the boundary of the playing field in accordance with the present invention.

Detailed description of the invention

The present invention is intended for use primarily on the tennis courts and volleyball courts, where the determination of the exact point of contact of the ball plays a major role in the establishment of the game.

Figure 1 shows the relative's Playground, which marked the playing field 1 with a stretched across the grid 2. According to the present invention on the border of the playing area outside the playing field 1 has grooves 3, each of which has a width not less than half the diameter of the ball used in the game, which is this Playground. Of course, the groove 3 on each side of the playing field 1 may have a larger width, the width of any of the grooves 3 may be different from the Irina other grooves 3. Preferably, however, to comply with the grooves 3 of the same width almost equal to the diameter used on this Playground ball or more.

In figure 2 one of the grooves 3 is shown in cross section. The depth of each groove 3 is preferably about half of its width, although it may be equal to, for example, only a quarter or third of the width, and may have a depth almost equal to the width. The depth of a quarter of the width or more selected from a technological and cost conditions of the manufacture of the grooves on the existing Playground. For example, for tennis court this depth may be 1 cm or more.

As can be seen in figure 2, the groove 3 according to the present invention is filled flush with the surface of the playing field 1 mixture of 4 plastic substance and bulk materials. As the plastic substance to optimally choose the clay, though it may be, for example, polyurethane or other elastomer. As the bulk substance, it is best to use sand, although it may be glass or ground blast furnace slag, as described, for example, in U.S. patent No. 7713133 (publ. 11.05.2010) and in French patent No. 2711684 (publ. 05.05.1995). The ratio of clay and sand, providing a clear imprint of the ball when it hits the surface of the filled groove is defined experimental the material depending on specific substances. However, you can specify, as the preferred boundary values of the ratio of clay and sand from about 70: 30 to about 30: 70 by weight. This mixture 4 is close to the composition used to obtain the surface of the clay tennis courts. In figure 2 the dashed line shows the contour of the ball 5.

Groove 3 is filled with a mixture 4 of the present invention, form the means for providing visual inspection of hitting the ball 5 on the border of the playing field 1. If the ball 5 hits for the most part on the surface of the playing field 1, the imprint on the surface of the mixture 4 in the groove 3 almost does not remain. If the ball 5 is completely or mostly strikes the surface of the groove 3, a mixture of 4 due to its plasticity captures a clear imprint of this strike. In principle, the groove 3 may have a width and less than half the diameter of the used ball, but then the imprint from the blow can be blurry due to touch the ball the edges of the grooves 3.

Thus, the tool of the present invention acts as a retainer track from the impact of the ball 5 as a mixture of 4 due to its high plasticity preserves a good dent from hitting the ball. In disputed cases, the judge enough to put the ball into this hole, to ensure that the controversial hit. The presence of the bulk component allows you to quickly smooth the surface of the mixture 4 labradorite games.

Since the grooves of the present invention, filled with a specified mixture, very cheap and easy to manufacture, and receive with them the marks of shot used the ball well distinguishable, the invention may find wide application, for example, in tennis and volleyball.

1. The method of providing visual inspection of hitting the ball on the boundary of the playing field, namely, that:
- place mentioned on the border mentioned outside of the playing field grooves of a width approximately equal to half the diameter of the above-mentioned ball or more;
- fill the said groove flush with the surface mentioned playing field with a mixture of the plastic substance and bulk materials in a ratio that provides the appearance of fingerprint mentioned ball when it hits the surface of the filled grooves.

2. The method according to claim 1, in which as mentioned plastic substances choose clay, and as mentioned granular matter choose the sand.

3. The method according to claim 2, in which the said ratio of clay and sand choose a weight in the range from about 30:70 to about 70:30.

4. The method according to claim 1, in which said groove is performed with a cross-section of semi-circular form.

5. The method according to claim 1, in which said groove is performed with a cross-section of rectangular shape.

6. The method according to claim 1, in which upon the mentioned groove comply with the cross-section of trapezoidal shape.

7. The method according to any of the preceding paragraphs, in which mentioned the playing field is a tennis court, and the ball is a tennis ball.

8. The method according to any one of claims 1 to 6, in which is mentioned the playing field is a volleyball court, and the said ball is a volleyball ball.

9. Means for providing visual inspection of hitting the ball on the boundary of the playing field, containing grooves placed at the above-mentioned boundary mentioned outside of the playing field with a width approximately equal to half the diameter of the above-mentioned ball or more, and filled flush with the surface mentioned playing field with a mixture of the plastic substance and bulk materials in a ratio that provides the appearance of fingerprint mentioned ball when it hits the surface of the filled grooves.

10. The tool according to claim 9, in which as mentioned plastic substance selected clay, and as mentioned granular substance selected sand.

11. The tool of claim 10, in which the ratio of clay and sand selected mass in the range from about 30:70 to about 70:30.

12. The tool according to claim 9, in which said groove is made with a cross-section of semi-circular shape.

13. The tool according to claim 9, in which said groove is made with a cross-section of rectangular shape.

14. The tool according to claim 9, in which the above-mentioned Cana is ka with cross-section of trapezoidal shape.

15. A tool according to any one of p-14, in which is mentioned the playing field is a tennis court, and the ball is a tennis ball.

16. A tool according to any one of p-14, in which is mentioned the playing field is a volleyball court, and the said ball is a volleyball ball.



 

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