JPH025682A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To discriminate whether picture information is received and recorded through a secret picture information restoring part or not by detecting a line terminate code of picture information in the input and the output of the secret picture information restoring part. CONSTITUTION:Facsimile picture information received from a line 1 is decoded to binary picture information. This information is branched to signals 4 and 5 in parallel for the purpose of discriminating whether picture information is kept secret or not, and the signal 4 is monitored by a shift register SR 1. When a transmission control part TC judges that picture is not secret, a changeover switch SW 1 is set to the side of the signal 4. The signal 5 is monitored by a shift register SR 2; and when the transmission control part TC judges that picture information is secret, the switch SW 1 is set to the side of the signal 5. Thus, it is automatically discriminated whether picture is secret or not and a recorded picture is reproduced on the reception side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile device, and particularly to a facsimile device having a secure communication function.

[Conventional technology]

Conventional facsimile machines employ a method of determining whether or not image information is anonymized, for example by adding a header code to the image information in advance and determining whether or not the image information is anonymized based on the presence or absence of this code. Alternatively, a method has been adopted in which the transmitting and receiving operators agree in advance whether or not to conceal the information, and the communication is performed by setting whether or not to conceal the information.

[Problem to be solved by the invention]

The above-mentioned conventional facsimile apparatus has the following drawbacks because it attaches a header code that precedes the image information to be transmitted. First, since the amount of information increases by the header code, the completion time becomes longer. Second, the header code is determined uniquely to each secret system, and is not universally applicable.

[Means to solve the problem]

The facsimile apparatus of the present invention includes a concealed image information restoring section that restores concealed image information from the decoding section, and a line termination code of the image information at the input and output of the concealed image information restoring section. and means for determining whether or not the image information is to be received and recorded via the anonymized image information restoring section.

〔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.

In FIG. 1, TC is a transmission control unit, NCU is a network control unit, DEM is a demodulation unit, DEC is a decoding unit, ENC is an encrypted image information restoration unit, SRI and SR2 are 12-stage shift registers, EOLI, EOL2 Line terminates (EOL)
) Code detection unit, PRT is a recording unit, SWI is a changeover switch, 1 is a line input signal, 2 is a demodulation unit input signal, 3 is a decoding unit input signal, 4 is a decoding unit output signal, 5 is concealed image information Restored signal, 6 is recording unit input signal, 7 is received data clock,
8 is the SRI output signal, 9 is the EOLI EOL code detection signal, 10 is the SR2 output signal, 11 is the EOL2 EOL code detection signal, 12 is the SWl switching control signal, 13 is the T
C to control signals between units; 14 indicates a block added according to the present invention;

FIG. 2 is a communication sequence diagram of control procedure signals for explaining the operation of this embodiment. In FIG. 2, S indicates a transmitter, R indicates a receiver, and the diagonal lines in the signal indicate CCITT, V29 or V27. 3 shows high-speed modem signals according to the TER recommendation. Furthermore, CED is a called station identification signal, NSF/C3I/DIS is a digital identification signal, and NS
S・TSI-DO3 is a digital command signal, TCP is a training check signal, CFR is a reception preparation confirmation signal,
P■X indicates image information, EOP indicates a procedure end signal, MCF indicates a message confirmation signal, and DCN indicates a line disconnection signal.

Note that CD0N indicates the timing at which chiaria is detected simultaneously with the end of the high-speed modem training signal that precedes the image information. 11 is whether the image information is kept secret or not.
The timing of determination by detecting the OL code is shown. Here, τ indicates the time required from CD0N to tl, which can normally be determined immediately after CD0N by the EOL code added to the beginning of the image information, so there is no loss of image information. Furthermore, even if the EOL code at the beginning of the image information is corrupted due to an error in the transmission path and it is impossible to detect the EOL code, the EOL code will always be
Since it is added line by line, even if one or two lines may be lost, it will be 0.25 to 0.25 in the sub-scanning direction in terms of the received original
Approximately 0.5mm, equivalent to missing the top of the reproduced image,
Normally, this part is a blank space in a manuscript, and there is no practical problem at all.

Next, the operation will be explained with reference to FIG. Facsimile image information received from line 1 is input to the DEC via the NCU and DEM, decoded, and returned to binary image information.

Here, in order to judge whether or not the image information is concealed, signals are branched into signals 4 and 5 in parallel, and signal 4 is monitored by shift register SR1, and the contents of the 12 stages of shift register SRI are This is an EOL code. ”ooo
ooooooo.

Only when the codes 001, , , , are detected, the output signal 9 of the EOLI turns ON, and at this point, the TC determines that the image information is not concealed, and sets SWl to the signal 4 side.

On the other hand, signal 5 is also monitored by SR2 at the same time, and similarly, when the EOL code is detected in signal 10, output signal 11 is turned ON, and at this point, TC determines that the image information is concealed. Judging,
Set SWI to 5 signal side.

In this way, on the receiving side, it is possible to automatically discriminate whether or not the image information is concealed, and to reproduce the recorded surface.

〔Effect of the invention〕

As explained above, by adding the simple hardware shown in 14 in FIG. 1, the present invention not only makes it possible to automatically discriminate whether or not image information is concealed, but also is shown. Since the EOL code is used, no extra information is added, so there is an effect that communication can be performed without increasing the transmission time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a communication sequence diagram of control procedure signals for explaining the operation of this embodiment. TC...Transmission control unit, NCU...Network control unit, DEM
... Demodulation section, DEC ... Decoding section, ENC ... Encrypted image information restoration section, SRI, 2 ... Shift register,
EOLI, 2... Line termination (EOL) code detection section, PRT... Recording section, SWI... Changeover switch.

Claims (1)

[Claims] a concealed image information restoring section for restoring the concealed image information from the decoding section; a means for detecting a line termination code of the image information at the input/output of the concealed image information restoring section; A facsimile apparatus comprising means for determining whether or not information is to be received and recorded via the anonymized image information restoring section.