KR19980034180A - How to scan a fax - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to a method of scanning a facsimile.

I. The technical problem to be solved by the invention

In order to perform a low resolution scanning, a scanner which scans in various resolution scan modes has to be equipped with an expensive paper feed motor, or to solve the problem of adjusting the scanning rate of an easily adjustable CCD sensor.

All. Summary of Solution of the Invention

The paper feed motor scans at the highest resolution that operates the slowest and transfers only the scan data necessary for performing the scanning according to the resolution set by the user from the scan data generated by the scan to the memory using the bit block transfer unit. It is characterized by storing in the memory.

la. Important uses of the invention

The present invention is used in facsimile.

Description

How to scan a fax

The present invention relates to a facsimile, and more particularly to a method for scanning at various resolutions in the facsimile.

Typically the facsimile can scan at multiple resolutions. The scanner may be divided into a super fine scan mode, a fine scan mode, a standard scan mode, and the like according to the resolution of the scan. The resolution in the super fine scan mode is usually 300 to 400 DPI. The resolution in fine scan mode is usually 200 DPI, and the resolution in standard scan mode is usually 100 DPI.

Here, the lower the resolution, the smaller the scan data amount, and the higher the resolution, the larger the scan data amount. Therefore, a user can send an original within a short time when scanning is performed by setting a scan mode of low resolution, and a document can be sent during a slower time compared to the scan mode of low resolution when scanning is performed by setting a scan mode of high resolution. Can be.

Meanwhile, the scanning according to the plurality of scan modes will be described in detail as follows. The moving speed of the original varies depending on the scan mode. Table 1 shows the relationship between the scan mode and the document transfer time.

Scan mode Super Fine FINE standard Resolution (DPI) 300 200 100 CCD sensor drive (times / sec) 100 100 100 Paper Feed Speed (Inch / sec) 0.33 0.5 One

As shown in Table 1, when the scan mode is super fine, the resolution is 300 DPI. In order to perform the scan at the resolution, the CCD sensor which performs the scan is driven 100 times, and the conveying speed of the document is conveyed at 0.33 (Inch / Sec) speed. That is, the conveying motor for conveying the sheet is driven at the speed of 0.33 (Inch / Sec). When the scan mode of the original is fine, the resolution is 200 DPI. In order to perform the scan at the resolution, the CCD sensor performing the scan is driven 100 times, and the document is transferred at a speed of 0.5 (Inch / Sec). That is, the conveying motor for conveying the paper is driven at the 0.5 (Inch / Sec) speed. In addition, when the scan mode is standard, the resolution is 100 DPI. In order to perform the scan at the resolution, the CCD sensor which performs the scan is driven 100 times, and the document is transferred at 1 (Inch / Sec) speed. That is, the conveying motor for conveying the sheet is driven at a speed of 1 (Inch / Sec).

The speed of the feed motor in the standard mode is much faster than the speed of the feed motor in other scan modes. In order to drive at a very high speed as described above, the torque of the transfer motor should be large. However, since the torque of the transfer motor is limited, driving the motor at a high speed as described above may cause the motor to lose out. Alternatively, when the high speed paper feed motor is different from the above, the above problem does not occur. However, since the high speed paper feed motor is very expensive, it causes another problem that increases the cost of the device.

On the other hand, unlike the above, a low-speed motor may be used, and instead, a method of adjusting the scanning rate of the CCD sensor may be used. However, the scanning rate of the CCD sensor depends on the inherent characteristics of the CCD sensor. It was very difficult to adjust.

As described above, there is a problem in that a scanner which scans in a scan mode having various resolutions in the related art should have an expensive paper feed motor in order to perform low resolution scanning. On the other hand, it is very difficult to adjust the scanning rate of the CCD sensor in order to perform a low resolution scanning.

Accordingly, an object of the present invention is to provide a method for scanning a facsimile, which can perform normal scanning even in a low resolution scan mode.

1 is a block diagram of a facsimile in accordance with a preferred embodiment of the present invention.

2 is a flowchart of a method for scanning a fax according to a preferred embodiment of the present invention.

The present invention for achieving the above object is to perform the scan at the highest resolution that the paper feed motor is the slowest operation, and only scan data necessary to perform scanning according to the resolution set by the user among the scan data generated by the scan Characterized in that the transfer to the memory using the bit block transfer unit and stores.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the annexed drawings, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram of a facsimile in accordance with a preferred embodiment of the present invention. The control unit 10 of the facsimile controls the overall operation of the transmission mode, the reception mode and the copy mode of the facsimile. The operation panel 24 is composed of key input means and display means. The key input means of the operation panel 24 generates data of a key pressed by the user for designating each scan mode and performing an operation of the designated scan mode, and outputs the data to the controller 10. The display means of the operation panel 24 performs a function of inputting and displaying display data indicating an operation state of the system when the controller 10 performs each mode. The sensor unit 26 detects the presence or absence of an input document and print paper and outputs the detected state signal to the control unit 10. The scanner 12 scans an image of the original and converts it into digital data while moving the input original. Scan data output from the scanner 12 is input to the band memory 14. The band memory 14 may store scan data corresponding to two bands of scan data input from the scanner 12. The stored scan data is input to the bit block transmission unit 16 (hereinafter referred to as 'BITBLT'). The BITBLT unit 16 receives a set command from the controller 10 and transmits only scan data of a specific portion of the scan data to the memory 18. That is, if the set command is a command to set the scan data to 100 DPI, the BITBLT unit 16 selects only scan data that can be output at a resolution of 100 DPI among the scan data stored in the band memory 14, and then stores the memory 18. To send. If the set command is a command to set the scan data to 200 DPI, the BITBLT unit 16 selects only scan data that can be output at a resolution of 200 DPI among the scan data stored in the band memory 14 and stores the memory 18. To send). If the set command is a command to set scan data to 300 DPI, the BITBLT unit 16 transfers the scan data stored in the band memory 18 to the memory 18 as it is. The BITBLT unit 16 is a device that is typically used to transmit only data of a specific position in a bitmap image. The memory 18 receives the selected scan data and transmits the scan data to the controller 10. The image processing unit 22 receives scan data from the control unit 10 and converts the scanned data into digital data. The print unit 20 prints the image data input from the image processing unit 22 on the print paper under the control of the control unit 10 during the reception mode and the copy mode. Under the control of the control unit 10, the modem 28 modulates and transmits the image data output from the image processing unit 22 to a transmission type, i.e., a facsimile standard. The coded image signal input through the signal is demodulated in its original form so that the image processor 22 can process the encoded image signal. The network control unit (NCU) 28 forms a transmission / reception path between the telephone line (Tip, Ring) and the modem 28 under the control of the control unit 10.

2 is a flowchart illustrating a method of scanning a facsimile according to a preferred embodiment of the present invention. 2 shows the flow of the scanning process of the original. In step 32 of FIG. 2, the controller 10 sets the resolution of the scanner 12. The resolution of the scanner 12 is set to 300 DPI. The resolution is the highest resolution among the various scan modes, that is, the resolution in the super fine scan mode in which the paper feed motor operates the slowest. When setting of the resolution of the scanner 18 is finished, the controller 10 performs step 34. In step 34, the controller 10 searches for a resolution of a target resolution which is a resolution of a scan mode set by a user. In other words, if the user sets the super fine scan mode by using the scan mode selection key on the operation panel 24, the target resolution is 300 DPI, 200 dpi in the fine scan mode, and 100 DPI in the standard scan mode. Accordingly, the controller 10 may search for a target resolution by searching for a key input of the user. The controller 10 performs step 36 when the target resolution is 300 DPI, performs step 40 when the target resolution is 200 DPI, and performs step 38 when the target resolution is 100 DPI. In step (36), the control unit 10 sets the BITBLT unit 16 to transmit the scan data of 300 DPI stored in the band memory 14 to the memory 18 as it is. In step (38), the controller 10 selects and transfers only scan data that can constitute an image of 100 DPI among scan data of 300 DPI stored in the band memory 14. That is, the BITBLT unit 16 selects and transfers only one line per three lines of 300 DPI scan data to the memory 18. Accordingly, the BITBLT unit 16 may generate 100 DPI scan data and store the scan data in the memory 18. In the step (40), the control unit 10 is configured to select and transfer only scan data capable of constituting a 200DPI image among 300DPI scan data stored in the band memory 14. That is, the BITBLT unit 16 selects only two lines per three lines of 300 DPI scan data and transfers them to the memory 18. Accordingly, the BITBLT unit 16 may generate 200DPI scan data and store the scan data in the memory 18.

When the execution of steps (36) to (40) is completed, the controller 10 performs step (42). In step 42, the controller 10 starts driving of the scanner 12. At this time, the paper feed motor of the scanner 12 is 0.33 (Inch / Sec) speed, the CCD motor is driven 100 times per second to perform scanning. The scanning is performed as described above because the scanner 12 is set to scan at a resolution of 300 DPI, which is a super fine scan mode in step (32). When the scanning is started, the scan data is sequentially stored in the band memory 14.

Meanwhile, when driving of the scanner 12 starts, the controller 10 performs step 44. In step 44, the controller 10 searches the band memory 14 to find out whether data corresponding to one band is stored. If data corresponding to one band is stored in the band memory 14, the controller 10 performs step 46. In step 46, the controller 10 drives the BITBLT unit 16. At this time, the BITBLT unit 16 is set in advance in steps 36 to 40, and selects and transfers the data recorded in the band memory 14 to the memory 18 according to the setting. When the transfer is completed, the controller 10 clears the memory area corresponding to the corresponding band. When the clear is completed, the controller 10 performs step 48. In step 48, the controller 10 searches whether the corresponding band of the transmitted scan data is the last band of the original. At this time, if the band of the scan data is the last band, the controller 10 ends. If the band is not the last band, the controller 10 searches to see if the storage of the scan data corresponding to the next band is completed by performing step (44) (46). The scan data corresponding to the next band is transmitted to the memory 18 by performing step (a).

The band memory 14 may include a memory area capable of storing scan data corresponding to at least two bands in order for the BITBLT unit 16 to select and transfer data generated during scanning, and to record the data in an empty memory area. Must be provided.

As described above, the present invention uses a low speed paper feed motor by processing scan data according to each resolution after scanning at the highest resolution, and performs scanning at various resolutions without changing the scanning rate of the CCD sensor. Can be.

As described above, the present invention uses a low-speed paper feed motor by processing scan data according to each resolution after scanning at the highest resolution, and performs scanning at various resolutions without changing the scanning rate of the CCD sensor. There is an advantage to this.

Claims (2)

In the method of scanning a fax, The paper feed motor scans at the highest resolution that operates the slowest, and transfers only the scan data necessary for performing the scanning according to the resolution set by the user from the scan data generated by the scan to the memory using the bit block transfer unit. How to scan a fax. In the method of scanning a fax, A scanner setup step that sets up the scanner to scan at the highest resolution with the slowest feed motor, A resolution search step of searching for a target resolution of a set scan mode by searching a user's scan mode setting; A bit block transmission unit setting step of setting a bit block transmission unit to select and transfer only scan data for forming an image according to the target resolution among data stored and scanned at the highest resolution; When the setting of the bit block transmission unit is finished, scanning is started, scan data generated at the time of scanning is stored in a band memory, and the bit block transmission unit selects and transfers the scan data stored in the band memory to a memory to target resolution. And a scan data storing step of storing the scan data according to the memory.