JPH04137972A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To attain transmission with excellent picture quality at memory transmission by storing resolution information of an opposite receiver in relating to an opposite telephone number registered corresponding to a prescribed automatic dial key so as to select proper resolution automatically and executing the original reading. CONSTITUTION:A one easy step key or an abbreviated dial or the like is used to make dialing and resolution information of an opposite receiver is stored in a RAM 3. When a prescribed key is entered in the memory transmission, a resolution storage area of the RAM 3 corresponding to the destination telephone number is referenced and compared with the resolution commanded by a resolution selection key on an operation console 4 and the original is read by the coincident resolution and the data is encoded sequentially and stored in a memory 8. Then an NCU 10 makes dialing by using a relevant telephone number and an encoded data is read from the memory 8 and modulated by a MODEM 9 and the resulting data is sent to a line. Since the read of an original is executed by referencing the reception capability of the opposite receiver obtained at preceding communication, the transmission with a proper resolution is always implemented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a facsimile device.

[Prior Art] In conventional memory storage and transmission, the resolution at which a document is read is determined solely by an operator's instructions from an operator console or the like.

The resolution of the facsimile machine in the sub-scanning direction is the required resolution 3,851 determined by CCITT.
/mm and optional resolution 7.717mm
More recently, a non-standard resolution of 15.4 sentences/mm, which is specific to the manufacturer of the facsimile machine, has been put into practical use.

[Problems to be Solved by the Invention] By the way, in normal transmission (original transmission) in which a document is read and transmitted at the same time, in a pre-communication procedure, the document is read at a resolution that matches the receiving capability of the other receiver. I can do it.

However, in memory transmission, the reading of the original has already been completed before the pre-step is executed, so it is not always possible to send the original at the same resolution as it was read.If the resolutions do not match, the transmitter will In this case, processing such as thinning out the main scanning lines that have been created will have to be performed.

However, this main scanning line thinning process has a drawback in that it causes deterioration in image quality due to two-dimensional variations in binary data.

For example, when converting from 15.4 sentences/mm to 7.71/mm, the scattered main scanning lines that were originally read in a narrow range in one sub-scanning direction will be enlarged twice when printing. The image quality is worse than that originally read at 7.7 sentences/mm.

In particular, in the case of a halftone image, halftones are expressed in a pseudo manner by the average density of binary pixels, so if the main scanning lines are thinned out, the image will be extremely poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile device that can read a document with appropriate resolution during special memory transmission.

[Means for Solving the Problems] The present invention provides a first storage unit that stores the telephone number of the other party in correspondence with a predetermined automatic dialing key, and a second storage unit that stores information on the receivable resolution of the other party's receiver. When transmitting to the other party, the receivable resolution information notified by the receiver of the other party is stored in the second storage unit, and thereafter, the memory storage and transmission to the other party is instructed. , the resolution information stored in the second storage unit is compared with the resolution specified by the sender, an appropriate one is selected from the resolutions stored in the second storage unit, and the document is read. It is characterized by carrying out.

[Function] In the present invention, information on the receivable resolution of the destination receiver obtained by executing transmission to the destination is stored, attached to the destination phone number registered in response to speed dialing, one-touch dialing, etc. By doing so, even if the other party sets a resolution that cannot be received and instructs memory transmission,
The document can be scanned by automatically selecting the appropriate resolution from among the receivable resolutions of the other party's receiver, eliminating the need for resolution conversion during memory transmission and ensuring good image quality for transmission. be able to.

[Example] FIG. 1 is a block diagram showing one embodiment of the present invention.

This facsimile machine includes a system control unit 1 that controls the operation of the entire device, a ROM 2 that stores programs executed by the system control unit 1, and a ROM 2 that stores destination phone numbers and resolution information that are compatible with one-touch dialing and speed dialing. It has a RAM3.

This facsimile machine also includes an operation console 4 equipped with input buttons such as a numeric keypad one-touch key and a resolution selection key, and a display, and outputs the read data, which is obtained by reading the original using COD or the like and converting it into binary data, to the system bus. a line buffer memory 6 that temporarily stores pixel data; and a line buffer memory 6 that reads pixel data from the line buffer memory 6 and performs encoding processing, or inputs encoded data and decodes it and stores it in the line buffer memory. 6, a large-capacity storage memory 8 that stores encoded image data, a modem unit 9 that modulates/demodulates signals input and output on one line, and a line connection. and a network control unit (NCU) 10 for controlling the network.

FIG. 2 is a schematic diagram showing the configuration of a storage unit that stores registration data corresponding to N one-touch dials in this facsimile machine.

This storage section is provided in the RAM 3, and has an area for storing the telephone number of the other party and the receivable resolution information of the receiver of the other party, corresponding to each one-touch dial. Although not shown, a storage section having a similar structure is also provided for speed dialing.

FIG. 3 is a flowchart showing the operation of transmitting a document. That is, in this embodiment, it is possible to select between original transmission and memory transmission by mode selection.

First, the telephone number of the other party is specified using the one-touch keys provided on the operation console 4 (Sl), and a key to instruct the start of document transmission is input (S2).
The NCUIO performs a call operation using the corresponding telephone number (S3).

Then, when a call is established with the other party's facsimile machine, C
A pre-procedure for facsimile communication according to CITT Recommendation T.30 is performed (S4). At this time, the present facsimile apparatus can learn the receivable resolution of the other party's facsimile apparatus from the DIS signal issued by the other party's facsimile apparatus.

Therefore, if the method used to make the call is one that uses one-touch keys or speed dialing on a single facsimile machine, the resolution information of the other party's receiver should be stored in the predetermined resolution data storage area shown in Figure 2. Store (S5).

Next, when transmitting the image, compare the resolution specified by the resolution selection key on the console 4 with the resolution information obtained from the DIS signal (S6), and send the image to the other party at the resolution specified by the facsimile machine. If the receiver is able to receive the data, it performs the reading operation at the same resolution. Conversely, if the receiver cannot receive the data at the designated resolution, it performs the reading operation at the resolution matched to the other receiver (S7).

The read data is transferred from the reading unit 5 to the line buffer memory 6, and the encoding/decoding processing unit 7 sequentially reads one image data from the line buffer memory 6 and performs the encoding process in order to perform encoding processing at this time. . The encoded data is modulated by the modem 9 and sent to the line through the NCUIO (Sa).

When all manuscripts have been transmitted as described above, the post-procedure is executed (S9) and the communication is completed.

FIG. 4 is a flowchart showing the memory transmission operation.

First, the telephone number of the other party is specified using a key such as a one-touch key provided on the operation console 4 (S11).
, When a key instructing the start of memory transmission is input (S12), the resolution storage area of the RAM 3 corresponding to the designated destination telephone number is referred to, and the resolution selected by the resolution selection key on the console 4 is selected. Compare with the resolution (S
l 3) If there is a resolution that matches both resolutions, the document will be scanned at that resolution, and if there is no matching resolution, the document will be scanned as specified by the resolution selection key within the receivable range of the other machine. The document is read at the resolution closest to the resolution set, sequentially encoded, and stored in the memory 8 (S14).

Thereafter, the NCUIO makes a call using the corresponding telephone number (S15), and when the call is established with the other party's facsimile machine, CCITT Recommendation T is applied.

Perform the pre-procedure for facsimile communication according to 30 (S
16) At this time, the destination facsimile device's D
The receivable resolution of the other party's facsimile machine is known from the IS signal, and if this is different from the resolution stored in the resolution storage area of the RAM 3, the resolution data registered in the RAM 3 is updated.

Note that if the destination telephone number is one that has never been transmitted, 7.7 squares/mm is set as the resolution information of the destination in the memory 3.

This is because the resolution of 7.7 squares/mm is CCITT
Although the recommendation states that it is optional, in practice,
Since this is the standard resolution provided by most facsimile machines, this is set as the default value.

Next, the encoded data is read from the memory 8, and the modem 9
It is modulated by and sent to the line through NCUIO (
S17).

When all manuscripts have been transmitted in the manner described above, the post-procedure is executed (518), and the communication is completed.

Note that the resolution in one broadcast transmission can be handled by selecting the lowest resolution among the designated broadcast destinations.

Even when dialing with a numeric keypad and the other party's phone number is not registered in the facsimile machine, by memorizing the phone number and resolution of the other party for past communications, you can dial the number that matches the stored data when dialing with the numeric keypad. If there is, reading is performed using this resolution, and processing similar to one-touch dialing becomes possible. If there is no match here, use it as the default value.

The above-mentioned 7.7 u/mm is the selectable upper limit.

[Effects of the Invention] As explained above, according to the present invention, since reading of a document is performed by referring to the reception capability of the other party's receiver obtained in advance during past communication, transmission at an appropriate resolution is always possible. This has the effect of preventing deterioration of image quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of a storage unit that stores registration data in the same embodiment. FIG. 3 is a flowchart showing the operation of transmitting a document in the same embodiment. FIG. 4 is a flowchart showing the memory transmission operation in the same embodiment. DESCRIPTION OF SYMBOLS 1... System control part, 2... ROM, 3... RAM, 4... Operation console, 5... Reading part, 6... Line buffer memory 7... Encoding/decoding processing part , 8...Storage memory. 9...Modem, 10...NCU. Patent applicant: Canon Co., Ltd. Agent: Arata Yokubo Figure 1 Figure 3 Figure 4

Claims (1)

[Scope of Claims] A first storage unit that stores a telephone number of the other party in correspondence with a predetermined automatic dialing key, and a second storage unit that stores information on the receivable resolution of the other party's receiver, At the time of transmission to the other party, the receivable resolution information notified by the receiver of the other party is stored in the second storage unit, and thereafter, when instructed to store and transmit to the other party, The resolution information stored in the second storage unit is compared with the resolution specified by the sender, and an appropriate one of the resolutions stored in the second storage unit is selected to read the document. A facsimile machine with special features.