BS ISO 1004-1:2013 pdf free
BS ISO 1004-1:2013 pdf free.Information processing – Magnetic ink character recognition
The typical edge of a printed character is not a straight line. The term “average edge” shall be used for horizontal and vertical edges and is defined as an imaginary line, parallel to either the vertical centre-line or the horizontal centre-line that divides the irregularities. The result is that the summation of the
white areas on one side of the line is equal to the summation of the black areas on the other side. The average edge of the radii shall be tangent to the average edge of the stroke. See Figure 19.
The average edge tolerance for all stroke edges shall be t 0,038 mm applied to the dimensions (measured from the vertical centre-line and horizontal centre-line) that locate the edges. A typical ilustration of this tolerance is shown at the top of Figure 20. The average edge of the radi shall be tangent to the average edges of the character, and the tolerance of the radii shall also be±0,038 mm.
Peaks and valleys located about the average edge shall be permitted to extend to±0,089 mm from the average edge. An example is shown in Figure 20. However, when these occur, the summation of the edge present in the 0,038 to 0,089 mm zone shall not exceed 25 % of the total edge.
An occasional void can be present at the edge of a character stroke and creates a valley that exceeds the 0,089 mm limit mentioned in 5.4.1. See Figure 20.
No two voids as described shall occur within 0,889 mm of each other as measured from the points of maximum excursion from the average edge.
Valleys that exceed the 0,089 mm zone are voids and are controlled by the void limits given in Clause 6 and shall be measured from the average edge of a character stroke. However, any portion of an edge void that is within the 0,089 mm zone shall be included in the measurement of the percentage of the edge present in the 0,038 to 0,089 mm zone.BS ISO 1004-1 pdf download.
