KR100206316B1 - Picture quality alterring method for facsimile - Google Patents

Abstract

The present invention relates to a method for changing the original image quality of a facsimile, and more particularly, to a method for changing the original image quality at the receiving side by requesting the receiving side to change the density or resolution of the original during receiving the original.

In order to prevent image data from being received to the extent that it is difficult to identify when receiving image data from the fax, it is necessary to input a key signal for changing the image quality of the received document during document reception, and corresponding to the input image quality change key. The data value is loaded into a nonstandard (NSF) code and transmitted to the sender. After analyzing the transmitted non-standard (NSF) code, the image quality mode is changed to the changed image quality data value, and the image data of the original is transmitted in the changed original image quality mode to receive the image data of the transmitted original.

Description

How to change the receiving document quality of the fax

1 is a block diagram of a facsimile system according to the present invention.

2 is a flowchart of a video quality change request control of a receiving side fax according to the present invention.

3 is a flowchart for controlling image quality change of a transmitting side fax according to the present invention.

4 is a flow chart of a transmit / receive protocol between faxes.

* Explanation of symbols for main parts of the drawings

10: central processing unit 20: memory unit

30: OPE 40: scanner

50: modem 60: NCU

The present invention relates to a method for changing the original image quality of a facsimile, and more particularly, to a method for changing the original image quality of a receiving side by requesting the receiving side to change the density or resolution of the original while the original is being received. .

In general, a facsimile machine sets an original state such as a resolution or density of an original to be transmitted by a sender. In reality, however, an original may be transmitted regardless of the original image quality of the receiving side. Therefore, the receiver may call the sender and change the density and resolution of the original to request retransmission if the recipient is difficult to identify due to poor image quality. At this time, when the sender automatically transmits in the absence, the user should just receive the blurred manuscript, which wastes unnecessary recording papers and telephone charges.

Also, since the sender is not aware of the importance of the original and how the recipient will receive the original when the original is sent, unnecessary paper is wasted when the original is sent in fine mode. At the same time, there was a problem that only the telephone charge was increased.

Accordingly, an object of the present invention is to provide a receiving side image quality changing method for solving the above problems.

It is another object of the present invention to detect the status of a receiving document and, when the receiving document is of poor quality, press the image changing key to request the image to be sent to the sender so that the sender automatically changes the image quality and transmits the image. The present invention provides a method of changing the reception quality.

In order to achieve the above object, the present invention provides an image quality changing key input process for inputting a key signal for changing the image quality of a received document during document reception, and data values corresponding to the image quality changing key input in the image quality changing key input process. The image quality conversion data transmission process carried on the non-standard code and transmitted to the transmitting side, the image quality change process of changing the image quality mode to the changed image quality data by analyzing the non-standard code transmitted in the image quality conversion data transmission process, and the image quality change process. An image data transmission process of transmitting image data of an original in one original image quality mode, and an image data reception process of receiving image data of an original transmitted in the image data transmission process.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a facsimile system according to the present invention, which stores a central processing unit 10 for controlling a system according to a predetermined program, a program including protocol data and text data, and the central processing unit. A memory unit 20 for accessing or storing data under control of (10), and a plurality of keys capable of generating various key data such as a dial key, a density setting key, a resolution setting key, a function setting key of the system, An OPE (OPERRATION PANNAL) 30 including a display device for displaying data, a scanner 40 which scans an image of an original and converts the image into digital image data and provides the same to the central processing unit 10; Under the control of the central processing unit 10, the output data of the central processing unit 10 is modulated and output into analog data, and the analog reception data is demodulated and output into digital data. Under the control of the modem 50 and the central processing unit 10 to form a call loop of a telephone line, and the signal of the modem 50 and the telephone line of the telephone line. Network control unit (NCU) 60 for interfacing the signal, and a printer 70 for printing the reception data by the control signal of the central processing unit 10.

FIG. 2 is a flowchart of the image quality change request control of the receiving side facsimile according to the present invention, and FIG.

4 is a flowchart of a transmission / reception protocol between faxes.

One preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

In order to transmit and receive image data of the original by calling the receiving side, the transmitting side transmits and receives a protocol as shown in FIG. First, when the calling party calls the relative fax, the calling party sends a calling tone (CNG) signal to the receiving party. After receiving the CNG signal at the receiver side, it transmits a Called Station Identification (CED) signal, and then transmits a Non-Standard Facilities (NSF), Called Subscriber Identification (CSI), and a Digital Identifcation Signal (DIS) signal. At this time, the transmitting side analyzes the NSF signal to determine whether there is a request for changing the image quality. If the image quality change request is performed, the image quality mode is changed, and non-standard set up (NSS), transmitting subscriber identification (TSI), and digital command signal (DCS) signals are transmitted to the receiver. The receiving side then sends a CFR (Confirmation To Receive) signal to the transmitting side. The transmitting side transmits original image data to the receiving side in response to the CFR signal. At this time, when one page of image data is transmitted, an EOP (End of Page) signal is transmitted from a transmitter to a receiver. Then, when the receiver sends the MCF (Message Confirmation) signal in response to the EOP to the sender, the transmission and reception of one page of image data is terminated, and the NSF (Non-Standard Facilities) and CSI are again sent by the receiver to transmit and receive the next page. Called Subscriber Identification and DIS (Digital Identification Signal) signals are transmitted to the transmitting side to repeat the above-described operation. Through the above protocol, the image data of the original is transmitted / received, and the image quality change request signal is loaded on the NSF signal from the receiving side to the transmitting side during execution of the protocol to change the image quality of the receiving side. A description with reference to the flowchart of FIG.

First, in step 21, the central processing unit 10 of the receiving side facsimile checks whether it is in the current reception state. Here, the image quality mode selection key includes all keys related to image quality control such as DARK, NORMAl, LIGHT key signal for adjusting the density, STANDARD, FINE, SUPERFINE key signal for adjusting the resolution, and PHOTO key signal for selection when sending photo documents. do. In step 22, no image quality mode selection key is input and general image data is received. That is, image data of the original is received in the image quality mode set by the transmitting side. However, if the image quality mode selection key is input in step 22, the process proceeds to step 24 and transmits the code corresponding to the input image quality mode selection key on the NSF signal transmitted during the protocol. It is assumed that a code corresponding to the image quality mode selection key is set as follows. DARK → 000, NORMAL → 001, LIGHT → 010, STANDARD → 011, FINE → 100, SUPERFINE → 101, PHOTO → 110

For example, if the FINE key, which is the image quality mode selection key, is input from the OPE 30 during the reception of the original image data from the receiving side fax, the central processing unit 10 of the receiving side fax loads 100 codes on the NSF signal and transmits it to the transmitting side. . Then, the central processing unit 10 of the sending side facsimile checks in step 31 whether it is in a transmission state and proceeds to step 32 in the transmission state. In step 32, the central processing unit 10 of the sending side facsimile checks whether an NSF signal is received from the receiving side facsimile and proceeds to step 33 if the NSF signal is received. In step 33, the central processing unit 10 of the sending side facsimile analyzes the NSF signal and checks whether a code corresponding to the image quality mode selection key, which is the image quality change request signal of the original, is present and has a code corresponding to the image quality mode selection key. Otherwise, normal document image data is transmitted. However, if there is a code corresponding to the image quality mode selection key in step 33, the process proceeds to step 35 and changes the resolution and density to the image quality mode requested for image quality change and proceeds to step 36. In step 36, the central processing unit 10 of the sending side facsimile transmits the image data to the receiving side in a mode in which the resolution and density are changed. That is, if the code for which the image quality change is requested is 100 in the NSF signal transmitted from the receiving side, it is recognized as the FINE mode and the transmitting side central processing unit 10 changes the resolution to the FINE mode and then transmits original image data in the FINE mode. In step 37, it is checked whether or not the original transmission is completed. If the original transmission has not been completed, the process returns to step 32 and repeats the above-described operation. If the original transmission is completed, the program ends.

When the image state of the original is transmitted in the FINE mode with the resolution converted in step 36, the receiving side facsimile proceeds to step 25 to receive image data in the original image quality requested by the receiving side, and proceeds to step 25. In step 25, the central processing unit 10 of the receiving side facsimile checks whether or not the original reception is completed. If the original reception is not finished, the process returns to step 22 and repeats the above-described operation. If the original reception is completed, the program ends. .

As described above, when the image quality cannot be recognized due to poor image quality of the original, the receiving side fax transmits the original image quality change request signal to the sending side fax and transmits the image data in the original image quality requested by the sending side automatically. Also, the receiving side facsimile machine can receive image data by changing the resolution and density, and also prevents unnecessary waste of paper or telephone charges because image data is not received to such an extent that it is difficult to identify the received document due to poor image quality. There is an advantage to that.

Claims (1)

A method for changing the image quality of a receiving side of a facsimile, the image quality changing key input process of inputting a key signal for changing the image quality of a received document during document reception, and data corresponding to the image quality changing key input in the image quality changing key input process. Image quality change data transmission process of sending value to non-standard (NSF) code and sending it to sender, and image quality change process of changing image quality mode to changed quality data value by analyzing non-standard (NSF) code transmitted in image quality change data transmission process. And an image data transmission step of transmitting image data of the original in the original image quality mode changed in the image quality change process, and an image data reception process of receiving image data of the original transmitted in the image data transmission process. Receive side original image quality changing method.