Dot pattern

Abstract

To realize a dot pattern which can be read even by a frame buffer of which algorithm for search is simple and of which resolution is low without sacrificing an information dot for defining a direction of a block. There is provided a dot pattern, wherein a plurality of reference points is provided in an area of a block having a predetermined information dot arranged thereon; a plurality of virtual reference points to be defined is arranged from the reference points (for example, a central point of a grid area); an information dot is arranged, of which information is defined by a distance and a direction from the virtual reference point; and at least the information dot at the predetermined position is made into a direction dot showing the direction of the block by a direction from the virtual reference point.

What is claimed is: 
     
         1 . A dot pattern,
 wherein a plurality of reference points is provided in an area of a block having a predetermined information dot arranged thereon;   a plurality of virtual reference points to be defined is arranged from the reference points;   an information dot is arranged, of which information is defined by a distance and a direction from the virtual reference point; and   at least the information dot at the predetermined position is made into a direction dot showing the direction of the block by a direction from the virtual reference point.   
     
     
         2 . The dot pattern according to  claim 1 ,
 wherein the reference points are grid points which are arranged at even intervals in the upper and lower directions or the right and left directions in the block area; and   using a center of the four grid points as the virtual vector start point and with reference to this virtual vector start point, the information is defined in the information dot by a direction eliminating the direction necessary for defining the direction dot.   
     
     
         3 . The dot pattern according to  claim 1 ,
 wherein, providing reference grid lines in a longitudinal direction and a lateral direction in the area of the block, the reference point uses virtual grid points which are provided on the reference grid line in the longitudinal direction or in the lateral direction at certain intervals as the virtual vector start point; and   with reference to this virtual vector start point, the meaning of the information is given depending on whether or not the information dot is arranged.   
     
     
         4 . The dot pattern according to  claim 3 ,
 wherein the information dot at a predetermined position in the block is defined as a direction dot; and   the information dot to be arranged at a position where the rectangular area to which this direction dot belongs is rotated 90 degrees by 90 degrees around the center of the block, respectively, defines the information by a direction or by a distance eliminating a direction necessary for defining the direction dot.   
     
     
         5 . The dot pattern according to  claim 1 ,
 wherein, providing reference grid lines in a longitudinal direction and a lateral direction in the area of the block, providing virtual grid points at certain intervals on the reference grid line, and arranging a reference grid point dot on the virtual grid point which is provided on the reference grid line in the lateral direction, the reference point uses a line connecting the reference gird point dots and a line connecting the virtual grid points in the longitudinal direction as a grid line and uses the intersecting point of the grid lines as a virtual vector start point; and   with reference to this virtual vector start point, the information is defined in the information dot by a direction eliminating the direction necessary for defining the direction dot.   
     
     
         6 . The dot pattern according to  claim 5 ,
 wherein the information dot at a predetermined position in the block is defined as a direction dot;   in an information dot other than the direction dot located on the grid line in the lateral direction on which the direction dot is arranged, and an information dot which is located at a symmetric position with the direction dot having a grid line in a lateral center direction of the block as a symmetric axis, the information is defined by a direction or by a distance eliminating the necessary direction for defining the direction dot.   
     
     
         7 . A dot pattern,
 wherein a plurality of reference points is provided in an area of a block where predetermined information dot is arranged;   a plurality of virtual reference points to be defined is arranged from the reference points; and   the information dots of which information are defined by a distance and a direction from the virtual reference points are arranged.   
     
     
         8 . The dot pattern according to  claim 7 ,
 wherein the direction of the block is defined by the arrangement of the reference point or the virtual reference point.   
     
     
         9 . The dot pattern according to  claim 7 ,
 wherein the direction of the block is defined by differentiating directional standards of at least one or more information dots at predetermined positions from those of the other information dots.   
     
     
         10 . The dot pattern according to  claim 7 ,
 wherein, in the information dots at one or more predetermined positions having the different directional standards being from those of the other information dots, the direction of the block is defined by the direction from the virtual reference point.   
     
     
         11 . The dot pattern according to  claim 7 ,
 wherein the reference point coincides with the virtual reference point.   
     
     
         12 . The dot pattern according to  claim 7 ,
 wherein the predetermined position is 3 or more; and   the direction of the block is defined by the shape connecting respective positions by a line.   
     
     
         13 . The dot pattern according to  claim 7 ,
 wherein the predetermined position is 1; and   the direction of the block is defined by the arrangement position in the block.   
     
     
         14 . The dot pattern according to  claim 7 ,
 wherein the direction of the block is defined by differentiating the size or the shape of the reference point or the information dot from those of the other dots.   
     
     
         15 . The dot pattern according to  claim 7 ,
 wherein the information is defined depending on whether or not the information dot is located on the virtual reference point.   
     
     
         16 . The dot pattern according to  claim 7 ,
 wherein the direction of the block is defined depending on whether or not the information dot is located on the virtual reference point.   
     
     
         17 . The dot pattern according to  claim 7 ,
 wherein the information is defined by the size or the shape of the information dot.   
     
     
         18 . The dot pattern according to  claim 7 ,
 wherein the direction of the block is defined by the size or the shape of the information dot.