JPH0258979A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To improve transmission efficiency by outputting specific inaccurate compressed data having a dot length shorter than a normal dot length and satisfactory compressibility to a facsimile network when data for each line continue with similarity equal to similarity set from an external part according to the type of an original or above. CONSTITUTION:When the similarity becomes equal to the similarity set from the external part correspondingly to the type of the original or above, a similar line signal is outputted. The specific inaccurate compressed data having the short dot length and high compressibility are previously stored in an inaccurate data buffer 7, and the inaccurate data buffer 7 receives the similar line signal and supplies the inaccurate compressed data to an output circuit 6. When the inaccurate compressed data are inputted from the inaccurate data buffer 7 to the output circuit 6, the output circuits 6 refuses compressed data from a compressor 3 and outputs the inaccurate compressed data from the inaccurate data buffer 7 to a facsimile network instead of the refused compressed data. Thus, it can be eliminated that a large quantity of data are outputted to the facsimile network even when similar image lines continue.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile device, and more particularly to a facsimile device that creates compressed data using the modified Huffman method.

[Conventional technology]

Conventionally, this type of facsimile machine compresses data line by line using a modified Huffman method and outputs the compressed data to a facsimile network.

Furthermore, the facsimile machine on the receiving side receives Modified Huffman compressed data line by line, expands it, and prints it. Furthermore, if invalid data is found during decompression, that data is discarded and the most recently decompressed data is printed instead.

[Problem to be solved by the invention]

The conventional facsimile machine described above compresses all data line by line using the modified Huffman method and outputs the compressed data to the facsimile network. In the modified Huffman method, due to the continuity of dots in one line of data,
Since the data length of the compressed data changes, there is a drawback that a large amount of data is output to the fax network even when similar image lines are consecutive.

[Means to solve the problem]

The facsimile device of the present invention includes a scanner that scans an image, a line buffer that stores data for each line of the image scanned by the scanner, and a compressor that compresses the data in the line buffer and outputs compressed data. , an outputted in-buffer that stores data scanned one line before the data stored in the line buffer, and a comparison between the data in the line buffer and the data in the outputted line buffer. a comparator that outputs a similar line signal when the result is equal to or higher than a preset similarity rate; an incorrect data buffer that outputs preset incorrectly compressed data according to the similar line signal; and an incorrectly compressed data that outputs the incorrectly compressed data. The apparatus includes an output circuit that, when received, replaces the compressed data with the illegally compressed data and sends it out, and a switch circuit that sets the similarity rate.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

As shown in FIG. 1, the scanner section 1 has a line buffer 2.
The contents of the image are transferred to the output line buffer 4, and the data for one line of newly scanned original image is transferred to the line buffer 2.
Store in. The compressor 3 extracts data from the line buffer 2, compresses it using the modified Huffman method, and outputs the compressed data for each line to the output circuit 6. The comparator 5 compares the data of the line buffer 2 and the data of the output line buffer 4 one line before the data of the line buffer 2 in units of dots, and determines the similarity between the two data based on the similarity set by the switch circuit 8. When the rate is equal to or higher than the rate, a similar line signal is output.

The illegal data buffer 7 stores specific illegally compressed data with a short dot length and high compression efficiency, and the illegal data buffer 7 receives similar line signals and supplies the illegally compressed data to the output circuit 6.

When the output circuit 6 receives illegally compressed data from the illegal data buffer 7, it discards the compressed data from the compressor 3 and instead outputs the illegally compressed data from the illegal data buffer 7 to the facsimile network. Note that the output circuit 6 outputs the compressed data from the compressor 3 when the illegal compressed data is not input from the illegal data buffer 7.

Note that the similarity rate set by the switch circuit 8 is determined in accordance with the type of document, and can be set from the outside by operating a switch.

〔Effect of the invention〕

As explained above, in the present invention, when data for each line is continuous with similarity equal to or higher than a similarity rate arbitrarily set from the outside depending on the type of document, the dot length is shorter than the regular dot length, However, by outputting specific illegally compressed data with a good compression rate to the facsimile network, it is possible to maintain the quality of the recording surface printed on the other party at a practically sufficient level and improve transmission efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...Scanner, 2...Line buffer, 3...
Compressor, 4... Output line buffer, 5... Comparator, 6... Output circuit, 7... Invalid data buffer,
8...Switch circuit.

Claims (1)

[Claims] A scanner that scans an image, a line buffer that stores data for each line of the image scanned by the scanner, a compressor that compresses the data in the line buffer and outputs compressed data, and a compressor that compresses the data stored in the line buffer. Compare the data in the output line buffer that stores data scanned one line earlier than the data in the output line buffer, and if the comparison result exceeds a preset similarity rate. a comparator that outputs a similar line signal when the similar line signal is received; an illegal data buffer that outputs illegal compressed data set in advance according to the similar line signal; A facsimile device comprising: an output circuit that replaces compressed data and sends it; and a switch circuit that sets the similarity rate.