JPH01251876A - Facsimile system - Google Patents

Abstract

PURPOSE:To respectively transmit in an adequate size even when the part of a small character and picture in one transmission original and the part of a large character and picture are mixed by preparing the transmission data of an adequate picture element size from the number of a changing point for each line of the transmission data and transmitting it to an opponent. CONSTITUTION:An original reading control means 3 makes a reading scanning part 1 read the transmission original in a smallest picture element size and delivers read picture data to a picture element size decision means and a picture element size conversion means. The picture element size decision means decides a transmission picture element size from the changing point of the picture data to be read by the original reading control means 3 and informs the picture element size conversion means of its result. The picture element size conversion means converts the picture element size of the read picture data into the picture element size to be determined by the picture element size decision means. Thus, the picture element size to be transmitted for each one scanning line is automatically set to an optimum size and the original can be sent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a facsimile system that encodes and decodes image data and transmits and receives the same, and particularly relates to determining the transmission pixel size.

(Prior Art) In a conventional facsimile machine, an operator looks at a document to be sent and selects the optimum sub-scanning line density or both the optimum sub-scanning line density and main scanning density to determine the pixel size at the time of transmission. It had been decided.

For this reason, with the facsimile machine described above, the line density (pixel size) can only be determined for each document, and when a single document contains both thin and large characters, a coarse pixel size is selected. As a result, it became difficult to distinguish fine text in the received manuscript. On the other hand, if a smaller pixel size is selected, the amount of image data that must be transmitted increases, resulting in a longer transmission time.

(Problems to be Solved by the Invention) As described above, in conventional facsimile machines, the operator looks at the original to be sent and selects the pixel size for each original for transmission. If there are characters with greatly different linear densities, some characters may be unrecognizable in the received document, and if all characters are distinguishable, the transmission time will be longer. .

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a facsimile apparatus that can automatically set the pixel size transmitted per scanning line to the optimum size and send a document.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a document reading control means for causing a reading scanning section to read a transmitted document at the finest pixel size, and image data read by the document reading control means. pixel size determining means for determining a transmission pixel size from a point of change in pixel value; and a pixel size for converting the pixel size of the image data read by the document reading control means into the pixel size determined by the pixel size determining means. a conversion means; and a pixel size designation bit addition means for adding a bit for designating the pixel size of the image data to the image data after encoding the image data converted to a predetermined pixel size by the pixel size conversion means. a transmitting side facsimile apparatus having a transmitting side facsimile apparatus, a pixel size determining means for detecting the pixel size from received and demodulated image data to determine the pixel size, and deleting a bit specifying the pixel size; and a receiving facsimile apparatus having a recording control means for recording and outputting the image data subjected to the decoding process after the processing is completed in the pixel size determined by the pixel size determining means. There is.

(Function) In the sending facsimile device, the original reading control means causes the reading scanning unit to read the transmitted original at the smallest pixel size, and passes the read image data to the pixel size determining means and the pixel size converting means.

The pixel size determining means determines the transmission pixel size from the change point of the image data read by the document reading control means, and notifies the pixel size converting means of the result. The pixel size converting means converts the pixel size of the read image data into the pixel size determined by the pixel size determining means. The pixel size designation bit addition means adds a bit that designates the pixel size of the image data converted to a predetermined pixel size by the pixel size conversion means when encoding the image data. Therefore, the encoded image data to which the pixel size designation bit has been added is modulated and transmitted. On the other hand, in the receiving facsimile device, the pixel size determining means detects the pixel size from the received and demodulated image data to determine the pixel size, deletes the bit specifying the pixel size, and records the determination result. Inform control means.

The recording control means prints the decoded received image data on paper at the pixel size determined by the pixel size determination means.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus of the present invention. Reference numeral 1 is a reading/scanning unit that reads the original, 2 is an encoding unit that encodes the read binary image data, 3 is a control unit that performs various controls related to communication operations, and 4 is a transmitting/receiving unit that transmits and receives line data. , modem unit (MOU) 4
1 and a network control unit (NCLJ) 42. 5 is a telephone line; 6 is a telephone connected to the facsimile device; 7 is a decoding unit that decodes the received encoded data;
8 is a recording section that prints decoded data on recording paper;
Reference numeral 9 denotes a news storage section, which stores the scanner printer buffer 91 for temporarily storing the binary image data from the original scanning section 1 or the binary image data to the recording control section, and the encoded data from the encoding section 2. It consists of a code buffer 92 for storage and a modem buffer 93 for outputting encoded data to the modem 41.

Next, the operation of this embodiment will be explained. At the time of transmission, the control section 3 scans the document set in the reading scanning section 1 at a main scanning density of 16.
dat/mm and sub-scanning line density of 15.41/mm, the read image data is referred to the line corresponding to the line in the scanner/printer buffer 91 of the information storage unit 9, and its change is detected. Select the appropriate pixel size from the number of points. However, the pixel size is (main scanning density 8
dot/mm, sub-scanning line density 3.8 J/mm > (main scanning density 8 dots/mm, sub-scanning line density 7.71/mm
) and (main scanning density 16 dots/mm, sub scanning line density 1
5.4. L/mm ). Further, it is assumed that a table showing pixel sizes corresponding to the above-described number of change points is registered in the control unit 3. When the pixel size selected as described above and the read pixel size do not match, the main control section 3 performs pixel size conversion and outputs the converted pixel size to the encoding section 2. The encoding unit 2 encodes the input binary image data and stores it in the coat buffer 92. Next, the control unit 3 adds bits corresponding to the pixel size selected by the above method to the encoded data read out from the code buffer 92 and inputs the data to the modem buffer 93. Further, the data input to the modem buffer 93 is sent to the transmitter/receiver section 4, modulated by the modem 41, and then sequentially sent out onto the telephone line 5 via the NCU 42.

On the other hand, the control unit 3 sequentially stores received data demodulated by the modem 41 from the telephone line 5 via the NCU 42 in the modem buffer 93 of the information storage unit 9 at the time of reception.

Next, the control unit 3 reads data from this modem buffer 93, first detects the EOL (end of line code), and then suppresses the tag bit (only during MR encoding) and the pixel size bit.

Here, FIG. 2 shows an example in which a bit indicating the pixel size is added after the EOL, and shows the MH and HR encoding systems. As shown in Figure 2 (A), a, b after EOL
, c are added. However, a indicates the main scanning density, and b and c indicate the sub-scanning line density, which have values as shown in the following table.

Further, FIG. 2(B) shows an example of a conventional EOL for comparison. However, in both of the above drawings, the MR is equipped with a tag pit. Next, after suppressing the tag pit and pixel size, the control section 3 sends the received data to the decoding section 7 while performing EOL detection bit by bit. The decoding 7 uses the encoding method indicated by the tag pit determined by the control unit 3 (only at the time of MR,
When the image is MH, it is always decoded using MH) to generate binary image data.

The control unit 3 sequentially stores the generated binary image data in the scanner/printer buffer 91. Figure 3 shows that when the HR encoding method is adopted using the pixel size bits shown in Figure 2 above, the main scanning and sub-scanning line densities are (8 dots/mm, 3
．． 8! M/u) −+ (8dot/u, 7°71
/mm) -+ ('16dot/mm, 15.4
1/mm 2 ) pixel size conversion is performed. However, the K parameter is 2 and 4.8, respectively.
It becomes.

Thereafter, the control section 3 reads one line of binary image data stored in the scanner/printer buffer 91, and transfers the read data to the recording control section 8 together with the pixel size information determined by the method described above. The recording control unit 8 performs printing and recording line by line at a specified pixel size according to the pixel size information.

FIG. 4 is a flowchart of the operation of the control section 3 during transmission. First, in step 401, the number of coding lines is initialized to O, and in step 402, it is determined whether the number of coding lines is O.
If not, go to step 405. In step 403, the pixel size is determined from the number of change points of the line corresponding to the r-th line in the scanner/printer buffer 91. Next, in step 404, the parameter 1 is set to the number of encoded lines. The data read out from the scanner/printer buffer 91 in step 405 is transferred to step 40.
After converting to the pixel size determined in step 3, the data is sent to the encoding unit 2. In step 407, a pixel size bit is added after the encoded data. In step 408, the number of encoded lines is decremented by 1, and in step 409, it is determined whether or not there is a document to be transmitted. If there is not, the process returns to step 402, and if there is, the process proceeds to step 410. At step 410, the RTC is sent to the receiving side as a transmission signal, and the process ends.

FIG. 5 is a flowchart of the operation of the control section 3 at the time of reception. First, in step 501, one bit of received data is extracted from the modem buffer 93, and in step 502, EOL detection is performed, and the processing of the above steps is repeated until this EOL is detected.

When EOL is detected, that is, when synchronization is established, the process proceeds to step 503, where the tag bit and pixel size bit are extracted from the received image data, and then 1 bit is extracted from the received data at step 504, and EOL is detected at step 505. I do. If EOL is detected in step 505, go to step 507, otherwise go to step 5.
Go to 06. In step 506, the received data is transferred bit by bit to the decoding section 7 and decoded to generate recording data, and then the process returns to step 504. Step 507 performs RTC detection, and if no RTC is detected, step 503
Return to step 1, and if detected, end the process.

According to this embodiment, transmission data of an appropriate pixel size is created from the number of change points for each line of transmission data, and
Since this is sent to the destination, even if a single document to be sent contains small text and pictures and large text and pictures, each can be sent with an appropriate pixel size. This prevents the pixel size from being too coarse and making it impossible to distinguish fine text in the received document, and also prevents the document transmission time from becoming unnecessarily long because the pixel size is made finer only for necessary parts. can do.

[Effects of the Invention] As described above, according to the facsimile apparatus of the present invention,
This has the effect of automatically setting the pixel size transmitted for each scanning line to the optimum size and sending the document.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the facsimile apparatus of the present invention, and FIG. 2 is a rough format E during MH and MR.
A diagram showing examples of OL and pixel size bits, Figure 3 is MR
A diagram showing an example of transmitted data when pixel size conversion is performed using the R encoding method. Figure 4 is an operational flowchart of the control unit shown in Figure 1 during transmission, and Figure 5 is the same as shown in Figure 1. 3 is an operation flowchart of the control unit when receiving the data. 1...Reading scanning section 2...Encoding section 3...
Control unit 4...Transmission/reception unit 7...Decoding unit 8...Recording control unit 9...Information storage unit Agent Patent attorney Nori Chika Norihito Sanno - Haichino ＼、ノFigure 4 Figure 5

Claims (1)

[Claims] A document reading control means for causing a reading scanning unit to read a transmission document at the finest pixel size; and a pixel size determining means for determining a transmission pixel size from a change point of a pixel value of image data read by the document reading control means. , pixel size converting means for converting the pixel size of the image data read by the document reading control means into the pixel size determined by the pixel size determining means, and converting the pixel size into a predetermined pixel size by the pixel size converting means. a transmitting side facsimile apparatus having pixel size designation bit adding means for adding a bit designating the pixel size of the image data to the image data after encoding the image data; A pixel size determining means detects the pixel size to determine the pixel size and deletes a bit specifying the pixel size, and after the processing by the pixel size determining means is completed, the image data subjected to the decoding process is What is claimed is: 1. A facsimile system comprising: a receiving facsimile apparatus having a recording control means for recording and outputting at the pixel size determined by the pixel size determining means.