JPS63228883A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To shorten transmission time by constituting the titled equipment with the coding part of an image signal, an arithmetic part that calculates a necessary minimum transmission bit number from a predicted recording time supplied by a recording time prediction part and the line speed, and and addition part that adds fill equivalent to said bit number to a code supplied by the coding part. CONSTITUTION:The coding part 1 encodes image signals 5 equivalent to one line, then transmits them to a fill adding part 4, and simultaneously informs the part 4 of the quantity of codes. The recording time prediction part 2 predicts a necessary recording time of a receiver from the image signal 5, and informs the result to the minimum transmission bit number calculation part 3. The calculation part 3 calculates a minimum transmission bit number from the predicted recording time and a bit of line speed information 9, and informs a resulting value to the fill adding part 4. The adding part 4 compares a code from the coding part 1 with the minimum transmission bit number from the part 3 with each other, and adds lacking quantity of fill codes to the image codes only when the quantity of codes generated by one line length is less than the minimum transmission bit number of this one line, and outputs the codes as codes 11 to a line. In such a way, the addition of fill codes is suppressed to the minimum.

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 recording method in which the time required for recording changes depending on the quality of the image.

[Conventional technology]

Generally, in facsimile machines, the redundancy of image signals is suppressed by encoding to efficiently transmit them. In such encoding, the efficiency of encoding changes depending on the redundancy of the image signal, and the amount of codes generated per unit time changes depending on the image signal. On the other hand, a receiving device usually requires a certain amount of time to record image signals for -scanning. Therefore, when codes are transmitted at a constant speed, if the codes are transmitted at a speed that exceeds the recording time of one line, it becomes impossible to record on the receiving side.

Therefore, in facsimile machines, a line synchronization signal for each Reichen (hereinafter referred to as EoL) is inserted as shown in Figure 2, which shows an example of the configuration of a transmission code. A number of fill codes are added between the stroke code and the EOL. This ensures the minimum time required for the receiving device to record one line of images.

The minimum time required for one line is called the minimum transmission time, and in normal facsimile machines, when determining the communication procedure between the sending device and the receiving device at the beginning of communication,
Decide on a certain value.

In the receiving device, if the time required to record one line depends on the number of dots in the received image, as in the case of thermal recording, for example, it is necessary to make sure that no matter what kind of image is received, it will not become impossible to record. Then, the longest possible recording time is determined as the minimum transmission time for that device, and this value is notified to the transmitting device at the start of communication.

[Problem that the invention seeks to solve]

In the conventional facsimile machine described above, even when a line of a picture can be recorded in a recording time shorter than the minimum transmission time, the transmitter adds fill codes until the minimum transmission time is reached, and the transmission time is reduced. Since the length of the communication is long, there are problems such as an increase in communication costs.

[Means for solving problems]

The facsimile device of the present invention includes an encoding unit that encodes an image signal, a recording time prediction unit that predicts the time required for recording the image in a receiving device based on the image quality, and a recording time prediction unit that predicts the time required for recording the image in the receiving device based on the predicted recording time and line speed. It is composed of a minimum number of transmission bits calculation section that calculates the minimum number of transmission bits required, and a fill adding section that adds a fill corresponding to the minimum number of transmission bits to the code of the image from the encoding section.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of a facsimile apparatus according to the present invention, in which 1 is an encoding section, 2 is a recording time prediction section, 3 is a minimum transmission bit number calculation section, and 4 is a fill addition section.

In FIG. 1, the image signal 5 is sent to the encoder 1 line by line.
is input to the recording time prediction section 2. The encoding unit 1 encodes the image signal 5 for one line and generates a code 6 for the image for one line.
At the same time, the code amount of the line is sent to the fill adding section 4 as a code amount notification signal 7.

On the other hand, the recording time prediction unit 2 predicts the time required for recording the image in the receiving device from the input image signal 5 for one line, and sends the predicted recording time signal 8 to the minimum transmission bit number calculation unit 3. Notice. The minimum number of transmission bits calculating section 3 calculates the minimum number of transmission bits necessary for that line from the input predicted recording time signal 8 and line speed information 9, and sends the calculated value to the fill adding section 4 using the minimum number of transmission bits notification signal 10. to notify.

The fill adding unit 4 compares the code amount notification signal 7 notified from the encoder 1 with the minimum number of sending bits notification signal 10 notified from the minimum number of sending bits calculation unit 3, and determines the amount of generated code for one line. Only when the number of bits to be transmitted does not reach the minimum number of bits to be transmitted for that line, a fill code for the shortage is added between the code of the stroke and the EOL, and is output as code 11 to the line side.

Note that in this actual implementation, the amount of fill code is added in units of one line, but the present invention is not limited to this, and the present invention can also be applied to cases in which fill is added with several lines or more as one unit. Of course.

〔Effect of the invention〕

As described above, the present invention suppresses the addition of unnecessary fill codes to the necessary minimum by controlling the amount of fill codes according to the image quality, and has the effect of reducing transmission time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus of the present invention, and FIG. 2 is a diagram showing an example of the structure of a transmission code. 1... Encoding section, 2... Recording time prediction section, 3...
Sending bit number calculation unit, 4... fill addition unit, 5...
Image signal, 6...-1 line of image code, 7... Code amount notification signal, 8... Predicted recording time signal, 9... Line speed information, 1o... Minimum transmission bit number notification signal, 11
...Sign. ,! /'J:. Agent Patent Attorney Susumu Uchihara νj7ゞ゛1-1

Claims (1)

[Claims] An encoding section that encodes the image signal, a recording time prediction section that predicts the time required for the receiving device to record the image based on the image quality, and a minimum number of bits required to send out from the predicted recording time and line speed. A facsimile apparatus comprising: a minimum number of transmission bits calculating section; and a fill addition section adding a fill corresponding to the minimum number of transmission bits to the image code from the encoding section.