KR0165205B1 - Image density controlling method for facsimile - Google Patents

Abstract

1. The technical field to which the claimed invention belongs

The facsimile is a technology that requires the receiving side to change the density of the original while the image data is being received, and automatically adjusts the image quality density at the sending side.

2. Technical problem to be solved by the invention

If the receiving party's image quality is difficult because the receiving side is difficult to identify, the sender's user inputs the image quality changing key and changes the image quality density on the sending side without calling the sender to change the original density and requesting retransmission. Do it.

3. Summary of Solution to Invention

If the image quality cannot be recognized due to poor image quality of the original, the receiving side fax sends the image quality adjustment request signal to the sending side facsimile, and the sending side automatically adjusts the image quality density requested by the receiving side to send the image data. The image data is received at the density adjusted by the receiving side fax.

4. Important uses of the invention

Applies to devices that adjust the density when receiving image data from the fax.

Description

Receiving side quality control of fax

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

2 is a flowchart for controlling image quality adjustment request of a receiving side fax according to the present invention.

3 is a flowchart of an image quality adjustment control of a transmitting side fax according to the present invention.

4 is a flow chart of a facsimile transmission and reception protocol.

5 is a schematic diagram of an ITH and ITL signal structure performing a protocol.

* 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 a facsimile original image quality, and more particularly, to a receiving side image quality density adjustment method in which a transmitting side adjusts and transmits the image quality density automatically when a receiving side requests to change the original density during image data reception.

In general, a faxer sets and transmits an image quality state such as density of an original to be sent. In reality, however, a document may be transmitted regardless of the density condition of the receiving end. Therefore, the receiver may call the sender and change the density of the original to request retransmission when it is difficult to identify the received original due to poor image quality. At this time, if the sender automatically transmits in the absence, the user should just receive the blurred manuscript, so there is a problem of wasting unnecessary recording paper and telephone bill.

In addition, when sending an important document, the sender does not know in what state the receiver will receive it. Therefore, if you send an original in fine mode that does not need to be sent in fine mode, unnecessary paper is wasted. There was only a weighted issue.

Accordingly, it is an object of the present invention to provide a method for adjusting the reception quality of a picture to solve the above problems.

Another object of the present invention is to detect the state of the original received by the user of the receiving side, when the image quality density change key is input, requesting the transmitting side to change the image quality of the receiving side to the transmitting side to automatically change the image quality density and transmit it. The present invention provides a method for adjusting the reception quality.

In order to achieve the above object, the present invention selects a key signal for changing the image quality density on the receiving side during document reception, and transmits the image quality concentration adjustment request signal to the transmitting side, and receives the image quality concentration adjustment request signal to make the requested image quality density. To transmit the image data.

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

FIG. 1 is a block diagram of a facsimile system according to the present invention, which includes a central processing unit 10 for controlling and controlling a system according to a predetermined program and controlling the image quality density, and a program including protocol data and text data. And a variety of key data such as a memory unit 20 for accessing or storing data under the control of the central processing unit 10, a system's dial key, density setting key, resolution setting key, and function setting key. OPE (OPERRATION PANNAL) 30, which has a plurality of keys that can be generated and includes a display device for displaying data, and converts the image of the document into digital image data, and then converts the image into digital image data. Under the control of the scanner 40 and the central processing unit 10, and modulating and outputting the output data of the central processing unit 10 into analog data, Modem 50 for demodulating and outputting the new data into digital data, and under the control of the central processing unit 10, constitutes a call loop of a telephone line (Tel-Line), and the signal of the modem 50 NETWORK CONTROL UNIT (NCU) 60 for interfacing the signals of the TEL and LINE.

The printer 70 is configured to print received data according to the control signal of the central processing unit 10.

2 is a flowchart illustrating an image quality adjustment request control of a receiving side fax according to the present invention.

3 is a flowchart of an image quality adjustment control of a transmitting side fax according to the present invention.

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

Figure 4a is a flow chart of the transmission and reception protocol of a typical facsimile,

Figure 4b is a flow chart of the transmission and reception protocol of the facsimile according to the present invention.

FIG. 5 is a structure diagram of an Inform Too High (ITH) and Inform Too Low (ITL) signal structure that performs a protocol.

One preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5 described above.

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 sender calls the state facsimile, the sender sends a calling tone (CNG) signal to the receiver. After receiving the CNG signal, the receiver transmits a Called Station Identification (CED) signal, and then transmits Non-Standard Facilities (NSF), Called Subscriber Identification (CSI), and Digital Identification Signal (DIS) signals. 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 receiving side transmits the MCF (Message Confirmation) signal in response to the EOP to the sending side, image data transmission and reception for one page is ended, and the receiving side again transmits non-standard facilities (NSF) and CSI ( Called Subscriber Identification) and DIS (Digital Identification Signal) signals are transmitted to the transmitting side to repeat the above-described operation. The above protocol is used to transmit and receive image data of a conventional document. To implement the present invention, when the MPS (Multi-Page Signal) signal is being transmitted from the transmitting side to the receiving side, the receiving side is MCF. (Message Confirmation), ITH, ITL should be able to send one of three signals. It is therefore possible by changing the protocol rules of the CCITT Recommendations. The signal structure of the ITH and ITL has a high level data link control (HDLC) structure, and the high level data link control (HDLC) has a shape as shown in FIG. Referring to the flowcharts of Figs. 2 and 3, the operation of adjusting the image quality density of the receiving document by loading the ITH or ITL signal on the ITH or ITL signal to the transmitting side according to the new protocol is described as follows.

First, in step 21, the central processing unit 10 of the receiving side facsimile checks whether it is in the current reception state, and if it is in the reception state, proceeds to step 22 and checks whether an image density adjustment selection key is input from the OPE 30 to request the image density adjustment. . Here, the image quality density adjustment selection key includes DARK, NORMAL, and LIGHT keys for adjusting the density, and when the user checks the received document and the image quality is not good, the image density adjustment adjustment key is pressed. If the image quality density adjustment selection key is not input in step 22, the central processing unit 10 receives general document image data in step 26. That is, the image data of the original is received at the image quality concentration set at the transmitting side. However, if the image quality concentration adjustment key is input in step 22, the process proceeds to step 23 and transmits the code corresponding to the input image quality concentration adjustment key on the ITH and ITL signals transmitted during the protocol.

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 CPU 10 of the sending side facsimile checks whether an ITH ITL signal is received from the receiving side facsimile and proceeds to step 33 if an ITH ITL signal is received. In step 33, the central processing unit 10 of the sending side facsimile analyzes the ITH ITL signal and checks whether there is a picture quality adjustment request signal of the original, and proceeds to step 34 if there is a picture density adjustment request signal. In step 34, the central processing unit 10 adjusts the image quality concentration corresponding to the image quality concentration adjustment request value and transmits image data of the original. However, if there is no image quality density adjustment request signal in step 33, the central processing unit 10 transmits general original image data in step 36. 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.

In addition, if the image data of the original is transmitted with the image quality density adjusted in step 34, the central processing unit 10 of the receiving side fax proceeds to step 24 to receive the image data at the original image quality density requested by the receiving side. Proceed 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 receiving document, the receiving side fax transmits the image quality adjustment request signal to the transmitting side facsimile, and transmits the image data at the image quality density automatically requested by the transmitting side. In addition, the receiving side facsimile machine can receive image data by changing the density, and also prevent the unnecessary waste of paper or telephone charges because the image data is not received to such an extent that the quality of the receiving document is low. There is an advantage.

Claims (3)

A method for adjusting the receiving image quality density of a facsimile, the process of inputting an image quality selection key for changing the image quality by checking the original image quality on the receiving side by the user during receiving the original, and when the image quality selection key is inputted. And transmitting the image data by transmitting the image quality concentration adjustment request signal to the transmitting side, receiving the image quality concentration adjustment request signal at the transmitting side, and adjusting the image quality concentration request signal to the transmitting side. The method of claim 1, wherein the image quality concentration adjustment request signal is transmitted on an ITH or ITL signal transmitted in a protocol. In the method for adjusting the original document density of the receiving side of the facsimile, the image quality density adjustment key input step of inputting a key signal for adjusting the image quality of the received document by the user during document reception, and the image quality density input in the image quality density adjustment key input step Image quality adjustment data transmission process that transmits data value corresponding to adjustment key to ITH and ITL signal to sender, and analyzes ITH and ITL signal transmitted in image quality concentration adjustment data transmission process, The image quality concentration adjustment process for adjusting the image quality, an image data transmission process for transmitting image data of the original in the original image quality mode adjusted in the image quality density adjustment process, and image data for receiving image data of the original transmitted in the image data transmission process. Receiving side original density adjustment method characterized in that consisting of a receiving process.