JPS5924424B2 - How to check the dot pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for checking dot patterns, and in particular,
The present invention relates to a method for checking a dot pattern in an image reproducing apparatus that sequentially scans a pattern made up of dot patterns and outputs the pattern by dividing the pattern into a plurality of times.

Conventionally, in an image reproduction device that sequentially scans a pattern made up of dot patterns and outputs it to a CRT (cathode ray tube), etc., when a single configuration such as a figure, character, or symbol is large, the memory capacity cannot be used for all of it at one time. Because the dot pattern cannot be memorized and output, it may be divided into several parts and output, and in this case, an error may occur in the number of dots in the dot pattern due to transmission noise superimposed during transmission. , Therefore, there are problems such as some patterns being omitted or being duplicated.

An object of the present invention is to check the total number of dots for each pattern by adding end information to the end of the pattern and checking the number of dots in the pattern when the end information is detected. The object of the present invention is to detect partial omissions, duplications, etc., and solve the problems in the conventional type described above. In the present invention, in an image reproducing apparatus that sequentially scans a pattern such as a figure, character, or symbol composed of a dot pattern and outputs the pattern by dividing it into multiple times, end information is added to the end of the pattern. In addition, when the end information is detected, it is checked whether the number of dots of the pattern is reliably output by comparing the counted value of the number of dots of the no-no-turn with a preset number of dots. A method of ticking a distinctive dot pattern is provided.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block circuit diagram of a checking device that performs a dot pattern checking method as an embodiment of the present invention. The dot pattern data 1 is transmitted to a display device such as a CRT 13 via an output register 11 and an output control circuit 12.
are output sequentially. At the same time, the number of dots of data 1 is counted by a dot number counter 15. In this dot number counter 15, the number of dots of data 1 and the preset number of dots data 2, for example, 128×128
■16 and 384 are compared, and if these values are different, "l" is output, and if they match, "01" is output.
is output. In the actual example shown in the figure, the comparison is made by counting down the counter 15 by the number of dots of data 1 with respect to the dot number data set in advance in the counter 15. The end decoder 14 is for detecting an end bit, which is end information added to the end of data 1, and outputs "l" at the time of detection. Therefore, an end bit is detected, and The dot number counter 15 determines the number of dots, for example 1683.
When 4 is counted, no error signal 3 is generated from the output of AND gate 16. On the other hand, when an end bit is detected, the count value of the dot number counter 15 is 163.
84, an error signal 3 is generated from the output of the AND gate 16. In this way, based on the preset dot number information, when the end information is detected, the outputted number of dots is checked. Furthermore, the above-described checking method is also used as a means for detecting whether data of a compressed pattern with a reduced amount of information has been normally restored and output. FIG. 2 shows a checking device for performing a dot pattern checking method as another embodiment of the present invention, and unlike the case of FIG. 1, the input data is compressed data.

The compressed data 15 is converted into normal data 1 by the decompression circuit 20.
is converted to This data is the same as data 1 in FIG. 1, and therefore the subsequent operations are also the same as in FIG. 1, so a description thereof will be omitted. In this way, the number of data dots is correctly checked for compressed data where data errors are likely to occur. In addition, in FIG. 2, end pits are detected from compressed data 17, but data 1
It is also possible to detect end bits from According to the present invention, end information with a special configuration is added to the end of the pattern, and when this end information is detected, the number of output dots is compared with the number of dots set in advance.
It is possible to check whether the number of dots in the pattern is accurate, and therefore to detect partial omission or duplication of the pattern, which is useful for solving the problems of the conventional type described above.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a check device that performs a dot pattern checking method as an embodiment of the present invention, and FIG.
The figure is a block circuit diagram of a check device for carrying out a dot pattern check method as another embodiment of the present invention. Explanation of symbols: 11: Output register, 12: Output control circuit, 13: CRTll4 near-end decoder, 15: Dot number counter, 16: AND gate, 20: Restoration circuit.

Claims (1)

[Claims] 1. Sequentially scanning patterns such as figures, characters, or symbols composed of dot patterns, counting the number of dots in the dot pattern, adding end information to the end of the pattern, and detecting the end information when the end information is detected. A method for checking a dot pattern, comprising: checking whether the number of dots in the pattern is reliably output by comparing a counted value of the number of dots in the pattern with a preset number of dots.