JPH02291776A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To select the best line density and to shorten a transmission time by deciding whether or not there are many change points on the line of a binary-coded signal train from a read part at the time of accumulating as to one page when data are sent out and determining the line density from the result automatically. CONSTITUTION:For example, when the number of change points on one line exceeds 30% of the total number of lines of one page, it is decided that the amount of information of the page is 'large'. Then a decision part 3 for the number of change points in one page outputs information for 'high line density', i.e., line density information 13 at the time of re-encoding. An encoder 4 encodes the binary-coded signal train 11 with 'high line density' by an M<2>R system at the time of re-encoding to match the ability of an opposite-side receiver, and accumulates the encoded data 14, page by page, in pairs with the line density information 13. Then when a large amount of data are broadcast from a memory 5 to many places, they are sent out with the best line density matching the amount of information according to the line density information 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a facsimile machine, and particularly to a facsimile machine that transmits compressed image data in large quantities to multiple destinations by broadcasting or the like. This paper relates to a method for automatically switching the linear density during re-encoding and transmission on a page-by-page basis depending on the complexity of the original area. Conventional technology Conventionally, in this type of facsimile machine, the linear density of each page is set according to the operator's intention when the original to be sent is compressed and stored. Priority was given to the linear density set above, and the stored image data was decoded, re-encoded, and transmitted. In addition, in systems that do not switch the line density on a page-by-page basis, the line density is switched on a line-by-line basis depending on the number of change points during re-encoding after decoding the stored image data. Problems to be Solved by the Invention In the conventional facsimile machine described above, once the data is compressed and stored, the linear density of each page is set according to the operator's will, and the stored data is decoded and re-encoded by the operator. When sending, each page is encoded and sent at the linear density set for each page, so even if the amount of information on one page is small, the linear density will be increased and the page will be sent. The disadvantage is that it takes a long time to transmit. This becomes more noticeable when transmitting a large amount of documents to multiple destinations, such as by broadcasting. Furthermore, when decoding the accumulated data line by line and re-encoding the raw data, if the line density is switched depending on the number of changing points of each line, the load on the software etc. that controls it increases, and This process required specifying the line density for each line, which had the drawback that only two-way communication was possible between in-house machines. The present invention has been made in view of the above-mentioned conventional situation,
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a new facsimile apparatus that can overcome the above-mentioned disadvantages inherent in the conventional technology. Means for Solving the Problems In order to achieve the above object, the facsimile apparatus according to the present invention detects, in its transmission system, the change between white pixels and black pixels in the binary signal sequence for one line from the reading section. Detect points, count the number of change points for each line, determine the number of change points for one line using a certain threshold, process that one line over one page, and exceed the value for a certain period of time. means for determining the amount of information in one page based on whether the counted value exceeds a certain threshold value in one page;
TT T. The means for compressing using the M2R method in Recommendation 4, the compressed data and the amount of information for one page are judged, and if the judgment is that the amount of information is large, the linear density is set to ``fine'' and the amount of information is ``small''. If it is ゜, there is a means for storing it in pairs with information for setting the linear density to "゜ standard" for each page, and a means for decoding the data from the storage means using the M2R method when transmitting compressed data by broadcasting etc. and a means for re-encoding the decoded raw data while switching the linear density for each page based on information for setting the linear density depending on the amount of information added to each page. It will be done. These encoders and decoders are used when transmitting at a line density that differs from the one determined due to the capabilities of the receiving end or the forced specification of line density on the transmitting side. Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. Referring to FIG. 1, the line-by-line binarized signal sequence 11 output from the reading unit 1 is detected by a change point detecting unit 2 in one line.
, the change points in one line are detected, counted, and compared with a preset threshold value, and the judgment result l2 is 1.
The information is input to the change point determination unit 3 for pages. For example, 1
If the line is 1728 bits and the number of change points in one line is 200 or more, that line is considered "complex".
If this exceeds 30% of the total number of lines on one page, the amount of information on that page is determined to be "large",
The change point number determining unit 3 in one page outputs information specifying the line density to be "fine" during re-encoding, that is, line density information l3. When the encoder 4 re-encodes the binary signal sequence 1l, the linear density is set to "
The encoded data M is stored in the memory 5 in pairs with the linear density information 13 in page units.The decoder 6 performs the encoding from the memory 5. Data M is decoded to obtain a binary signal sequence similar to the binary signal sequence 1l, that is, raw data l5.Here, the case where the data is matched to the capabilities of the other receiver, regardless of the linear density information l3 at the time of storage, is , this raw data 15 is encoded again through the encoder 7 and sent out as encoded data l6.

Furthermore, when transmitting a large amount of data from the memory 5 to multiple destinations for broadcasting, etc., the linear density information 13 is used to transmit the data at the optimal linear density according to the amount of information. Effects of the Invention As explained above, according to the present invention, in the transmission system of a facsimile machine, when transmitting accumulated data by circular etc. By determining the number of line change points in a binary signal sequence over a page, and automatically determining the line density that allows the corresponding page to be transmitted clearly in the shortest time based on the results, it is possible to broadcast information. When transmitting a large amount of documents to multiple destinations, the optimal linear density is selected and the transmission time can be shortened. Furthermore, according to the present invention, in the conventional linear density switching process for each line, it could only be used as an in-house mode when communicating with the in-house machine, but with this method of switching the line density for each page, it can be used as before. CCITT T. Since communication is possible using the 30-step procedure, transmission to other companies' machines can be performed without any problems.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Reading unit, 2... Determining the number of change points in one line, 3... Determining the number of change points in one page, 4... Encoder, 5... Memory, 6... - Decoder, 7... Encoder, 11... Binarized signal sequence, 12... Data for determining the number of change points in one line, 13... Data for determining the amount of change points in one page, M...Encoded data, l5...Raw data, 16...Encoded transmission data Patent applicant NEC Corporation Representative Patent attorney Yutaro Kumagai

Claims (1)

[Claims] In the transmission system of a facsimile machine, the points of change between white pixels and black pixels in one line of binary signal string from the reading section are detected and the number of the points of change is counted for each line. means for determining the number of change points for one line using a certain threshold value and determining the amount of information for one page using a certain threshold value; means for compressing data using the M^2R method in Recommendation No. 4, and means for storing the compressed data by the compression means in combination with information for determining the number of change points for one page using a certain threshold value and switching the linear density; A facsimile apparatus comprising means for decoding data from the storage means using the M^2R method, and means for re-encoding the decoded raw data while switching the linear density depending on the number of change points. .