KR100242847B1 - Magnification error compensation method by a special sheet in a shuttle scanner - Google Patents

Abstract

The present invention relates to a method for compensating a magnification error by a specific sheet in a shuttle type scanner. The present invention relates to a method of compensating for a magnification error by a specific sheet. If the magnification correction mode is selected in the step of determining whether is selected, scanning of a specific sheet area and scanning a specific sheet area in the scanning step of the specific sheet area are performed using the result. A step of calculating an error and a step of generating and updating a magnification factor according to the magnification error when the magnification error is calculated in the step of calculating the magnification error. The magnification error of the shuttle-type scanner, in which the magnification error is variable within a certain range, is determined by the specific external pattern and image processing. By using a correction, the magnification error of the shuttle-type scanner can be stably managed, and software can be corrected at any time.

Description

How to compensate for magnification error due to specific sheet in shuttle type scanner

The present invention relates to a method for compensating magnification error by a specific sheet in a shuttle type scanner, and in particular, an image quality deviation between blocks due to magnification error of a shuttle type scanner using a specific sheet in a device employing a shuttle type scanner. It is about how to compensate.

Looking at the configuration of a general multifunction device using the accompanying drawings as follows.

1 illustrates a conventional composite device function, and receives or processes data or control signals from a host such as a PC 20 through an interface 11 or transmits processed data. At this time, if print data generated in the PC 20 is transmitted through the interface 11, the transferred print data is received by the central processing unit 12.

The central processing unit 12 receiving the print data reads the necessary control program and data through the memory unit 13 and outputs a control signal for printing the print data. The output control signal is applied by the print driver 14. The print driver 14 receiving the control signal controls the printing mechanism 15 according to the applied control signal to form a print on the paper to perform a print job.

In addition, the scan job detects a scan function selected by a user through an operation unit (not shown) in the central processing unit 12 to control the scanner 17. When the information recorded on the original is scanned through the scanner 17, the scanned image data is compensated for by the image processing unit 16 and stored in the image memory 18. The image data stored in the image memory 18 is transferred to the PC 20 through the interface 11 and stored in a file format under the control of the central processing unit 12, or the FAX function is provided. If present, it is used as transmission data.

At this time, in order to scan the information recorded on the document in the scanner 17, the document is scanned in units of a horizontal line. As a result, when manufacturing a composite device, even if the scanner's magnification was not accurately tuned, scan quality was not significantly affected.

For example, if you are tuned to scan the 200mm width of the original in the horizontal direction, you will be scanning 202mm due to 1% scaling error, which is an enlarged scan of 202/200 in the horizontal direction of one original. . Scanning enlarged by 202/200 in the horizontal direction of one original does not affect scan image quality because the edge of the original is scanned enlarged.

However, when applied to the mechanism of the shuttle-type scanner, the magnification error caused by the 1% error causes more than one dot (hereinafter referred to as dot) at the time of assembling as before. This is because the shuttle mechanism divides one original into several bands and scans one page, so scan data is composed of one page, and the ratio of magnification error increases, which has a critical effect on scan quality.

This magnification error is caused by the optical system of the shuttle type scanner that is in charge of scanning, and each of the optical systems has a slight difference. As a result, when the attachment condition of the shuttle type scanner module is changed to an external impact light, there is a problem that maintenance and repair are inefficient because the operation of dismantling the external structure and the operation of correcting it again are required.

Therefore, in order to solve the above problems, the present invention corrects the magnification error of a shuttle type scanner in which a shuttle type scanner has a variable magnification error within a certain range by using a specific external pattern and an image processing algorithm. It aims to stably manage the magnification error of the shuttle type scanner and to provide stability of the shuttle type scanner that can be corrected by software at any time.

According to the present invention for achieving the above object, the magnification correction mode is selected in a step of determining whether the magnification correction mode is selected when the composite device equipped with the shuttle type scanner is driven, and determining whether the magnification correction mode is selected. Scanning a specific sheet area; and scanning a specific sheet area in the step of scanning the specific sheet area, calculating a magnification error using the result, and calculating the magnification error. When the magnification error is calculated in the step, the magnification factor is generated and updated according to the magnification error.

1 is a block diagram showing the internal circuit configuration of a conventional composite device;

2 is a flowchart illustrating a method of compensating for magnification error by a specific sheet according to the present invention;

3 is a view showing the configuration of a specific sheet according to the present invention;

4 is a block diagram showing the internal circuit configuration of a composite device to which the present invention is applied;

FIG. 5 is a block diagram showing details of an image processor shown in FIG. 4;

6 is a schematic view showing an assembly configuration of the shuttle type scanner shown in FIG. 4;

7 is a perspective view showing the configuration of a drive mechanism of the composite device shown in FIG.

8 is a state diagram showing a shuttle block of an A4 size original;

FIG. 9 is a diagram showing a slice in one block of an A4 size original shown in FIG.

＊ Description of Signs of Main Parts

110: system memory 120: CPU

130: ECP and print driver 140: print mechanism

140a: printhead 140b: carrier

140c: guide shaft 140d: time belt

140e: CR motor 140f: LF motor

140g: LF roller 150: image processing unit

160: shuttle type scanner

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

2 is a flowchart illustrating a method for compensating magnification error by a specific sheet according to the present invention, and FIG. 3 is a view illustrating a configuration of a specific sheet according to the present invention. As shown, starting step (S110) for driving the multi-device equipped with a shuttle type scanner, and if the multi-device equipped with a shuttle type scanner is driven in the start step (S110) to determine whether the magnification correction mode is selected Step S120 and step S130 of scanning a specific sheet 1a region when the magnification correction mode is selected in step S120 of determining whether the magnification correction mode is selected, and specifying the magnification correction mode. In step S130 of scanning the area of the sheet 1a, when the specific area of the sheet 1a is scanned, step S140 of calculating a magnification error using the result and step of calculating the magnification error S140 If the magnification error is calculated in step S150 of generating and updating a magnification factor according to the magnification error, and in step S120 of determining whether the magnification correction mode is selected, the magnification correction mode is not selected. Scan In operation S160 of deleting the last data of the slice with reference to the magnification factor, and in step S160 of deleting the last data of the slice with reference to the magnification factor, the slice is referenced with the magnification factor. In step S170, the scanned data is enlarged and corrected by a ratio with reference to the magnification factor during image processing by deleting the last data, and in step S170, by magnification and correction by a ratio with reference to the magnification factor in the image processing. In step S180 of transmitting the corrected scan data to the PC or PSTN network, and in step S180 of transmitting the corrected scan data to the PC or PSTN network, the corrected scan data is transmitted to the PC or PSTN network. When the scan operation is completed, the step S190 determines whether the scan job is finished or the step S190 determines whether the scan job ends. If it is determined to be N, return step (S200) for re-executing step (S160) for deleting the last data of the slice (S160) with reference to the magnification factor, and step (S190) for determining whether the scanning operation is finished. In step S210, if it is determined that the scan operation is the end of the scan operation, the scanning operation or the magnification correction operation is terminated.

At this time, the characteristic sheet 1a scanned to perform the magnification correction operation in step S130 of scanning the specific sheet 1a area is specified at intervals equal to the resolution of the shuttle type scanner. The blocks (BLOCK 1, BLOCK 2, ..., BLOCK n) are composed of colors and patterns at the same level. In this case, the configuration in each block (BLOCK 1, BLOCK 2, ..., BLOCK n) is a shuttle type scanner having a 300 DPI resolution, dividing one slice into 160 dots, and each dot has a color and a scan level ( Levels are configured to have different patterns.

That is, as in the example in which the first block BLOCK 1 is enlarged as shown in FIG. 3, the maximum level value is divided by the maximum magnification error value X when the shuttle type scanner is color or black and white. The specific sheets 1a are formed by repeatedly arranging X pieces of patterns at the level intervals.

This configuration will be described in more detail with reference to FIG. 4 to FIG. 9 as follows.

Looking at the general operation of the multi-function device 100 equipped with the shuttle type scanner 160 in the start step (S110) briefly, if the user turns on the power or executes the reset through the operating means (not shown) CPU 120 reads a system control program or initial setting condition data stored in the system memory 110 and performs an initialization operation.

In the state where the composite apparatus 100 is initialized, the user selects a program using the PC 200 and the CPU through the ECP 130b of the composite apparatus 100 to print data generated by executing the selected program. Is sent to 120. The print data transmitted to the CPU 120 is processed through the CPU 120 and applies a control signal accordingly to the print driver 130a. At this time, the ECP 130b is a bidirectional parallel interface module based on IEEE 1284, and is used to transmit and receive data generated by the PC 200 and the multifunction device 100.

The print driver 130a receiving a control signal output from the CPU 120 receiving the print data transmitted through the ECP 130b controls the printhead 140a according to the applied control signal to execute a print job. To generate a control signal. That is, the print driver 130a may include a printhead 140a fire and an enable control signal, a phase and position control signal of the CR motor 140e, and a printhead required for a print job. Various control signals for controlling data handling and the LF motor 140g are generated and output.

The control signal generated by the print driver 130a is transmitted to the print mechanism 140 to prepare for the print job. That is, the printing paper stored in the document 1 or the paper feeding unit 100a storing the printing paper is transferred to the printing position of the print head 140a.

In order to print the print paper at the printhead 140a bottom printing position, the LF motor 140f is rotated in accordance with a control signal applied from the print driver 130a to print the print paper by the frictional force of the LF roller 140g. Transfer to.

When the print paper is transferred to the print position on the bottom surface of the print head 140a, the CR motor 140e, which receives the control signal output from the print driver 130a, rotates according to the applied control signal and rotates through the time belt 140d. The carrier 140b on which the print head 140a is mounted is reciprocated left and right along the guide shaft 140c.

The printhead 140a mounted on the carrier 140b which performs the reciprocating motion along the guide shaft 140c by the CR motor 140a is ink according to the data generated by the CPU 120 on the transferred printing paper. Spraying to form a factor. Through this continuous operation, the multifunction apparatus 100 continuously prints the print data generated by the PC 200 to complete a print job.

In addition, the rasterizer 180 is used to transform the scanned data for transferring the scanned data scanned through the shuttle type scanner 160 to the print mechanism 140 or the PC 200, The matrix-converted converted data is modulated by the modem and the LIU unit 190 to process the fax signal to be transmitted to the outside via the PSTN network.

When the composite apparatus 100 is driven to perform a scan operation in the start step S110, it is first determined whether the magnification correction mode using the specific sheet 1a to be conveyed in the same manner as the printing operation is selected ( S120). At this time, since the specific sheet 1a is the same as the pass through which the printing paper is fed in the printing operation, the description thereof will be omitted.

As a result, when the magnification correction mode using the specific sheet 1a is selected, the area of the specific sheet 1a transferred to the scan position of the shuttle type scanner 160 is scanned (S130). When the area of the specific sheet 1a is scanned, a magnification error is calculated using the scanned data (S140). When the calculation of the magnification error is completed, it is stored in the system memory 110 to generate and update the magnification factor (S150).

Referring to this process in more detail, as shown in FIG. 6, in the magnification adjustment of the shuttle type scanner 160, the magnification is adjusted by adjusting ″ a, b ″. That is, when the magnification is adjusted by adjusting ″ a, b ″, the magnification is b / a, and the correction data for preventing the deterioration of scan image quality caused by an error in the adjusted magnification is calculated.

To improve this passive method, a specific sheet 1a is constructed, which can be attached on the horizontal movement path of the shuttle type scanner 160 or provided to the user as a chart for correction. .

The specific sheet 1a is related to the resolution of the shuttle type scanner 160 and the number of dots each slice is configured to scan, and thus may be applied in a modified form. Here, the shuttle type scanner 160 for 300 DPI will be described as an example.

The shuttle type scanner 160 having a resolution of 300 DPI scans one slice in one block divided into 160 dots. At this time, the error generated when the shuttle type scanner 160 is assembled is 5% of 160 Dots of one slice by the maximum magnification error generated by external vibration and impact while the user is actually using it. In addition, a magnification error of 8 dots may occur.

When the magnification error to be corrected is at most 8 Dot, the minimum length of the specific sheet 1a is 168 Dot * 300 inch * 25.4 mm = 13.88 mm. That is, it is the length when a specific sheet is composed of 164 patterns arranged at 1/300 inch intervals. However, in consideration of the movement error of the shuttle type scanner 160, it is necessary to configure a specific sheet 1a having a longer shape.

At this time, if the magnification error is 0 and the first data of the slice is black scan data when the specific sheet 1a is scanned, the scan data of the last 160th dot is white. At this time, the pattern in one slice in the specific sheet 1a is gradually composed of the last white with the first dot pattern being black.

Therefore, if the magnification error is increased by +1 dot, the first dot data of the slice becomes black and the last is scanned up to the 161th dot. Comparing the scan level values of the last scan dot data can confirm the magnification error, which can be corrected.

At this time, when the CCD 163 used in the shuttle type scanner 160 is color or black and white, the X patterns of the level intervals obtained by dividing the maximum level value by the number of maximum magnification error values (X) are repeatedly. Arrange with

More specifically, scan by referring to the magnification factor. That is, the data due to the magnification error in which the magnification factor is enlarged is deleted from the end of the slice, and the lost data ratio is reflected in the image processing. In other words, by deleting the overlapping data area in one block to prevent the effect of reducing the total data.

For example, if 5% is reduced and magnification error occurs, the correction is performed by expanding in the vertical direction by 5%. The result of the correction is stored in the system memory 110 as a factor value and updated to be referred for each scan.

When the magnification factor is generated through this process and the magnification factor in the system memory 110 is updated, the scan operation is performed using the updated magnification factor.

In the scan operation using the updated magnification factor, first, when the magnification correction mode is not selected in step S120, the last data of the slice is deleted by referring to the magnification factor in the normal scan operation (S160). The scanned data is corrected by the image processor 150 by deleting the last data of the slice with reference to the magnification factor (S170).

When the scan operation is corrected through the image processor 150 and completed, the scanned data is transmitted to the PC 200 or the PSTN network (S180). Through this process, it is determined whether one scan job is completed (S190). As a result of the determination, if the scan job is not completed, the return step S200 is executed and the step S180 is executed again in step S160 to perform the scan job. As a result, when it is determined that the scan job is finished, the scan job is ended through step S210.

Looking at this process in more detail as follows.

The scan job is scanned by dividing the CCD 163 of the shuttle type scanner 160 used as shown in FIG. 8 into 27 blocks in the case of A4 size when the scan resolution is 300 DPI. In addition, each block of the scanned document 1 is divided into 2551 slices and scanned as shown in FIG. 8.

In the scanning operation, the CPU 120 controls to scan the information recorded in the document 1 when the document 1 is transferred to the scan position of the bottom of the shuttle type scanner 160. The data scanned by the shuttle type scanner 160 is read and corrected by the image processor 150 by reading an updated correction factor value stored in the system memory 110 through a data bus.

At this time, the image processing unit 150 is assigned a DMA channel in accordance with the DMA control signal DAM_CONT of the CPU 120. The image processing unit 150 assigned with the DMA channel receives the format data F_DATA output from the system memory 110 and the control data CONT_DATA output from the CPU 120 through a data bus. Received to the scanner controller 151.

The scanner controller 151 of the image processing unit 150 that receives the control signals and data output from the system memory 110 and the CPU 120 through the data bus is connected to the IP control signal IP_CONT according to the applied control signals and data. ) And the A / D sample clock S_CLK and the driving clock D_CLK are generated and output.

At this time, the driving clock D_CLK source for driving the CCD 161 is configured by a clock generation such as a master clock, a shift register clock, a transfer gate clock, and the like. In addition, when the CCD 161 is configured as a dummy photo cell before and after the effective photo cell, an actual data scan is executed through the effective photo cell.

The driving clock D_CLK output from the scanner controller 151 is applied by the CCD 161 of the shuttle type scanner module 160 to scan the information recorded in the document 1 transferred to the scan position. The CCD 163 of the shuttle-type scanner module 160 receives a light signal that is reflected at a predetermined angle after being incident on the document 1 by the lamp 163 in accordance with an applied driving clock D_CLK. It is incident through the lens 162 to generate analog image data A_DATA.

The analog image data A_DATA generated by the CCD 161 is transferred to the A / D converter 152 of the image processor 150. The image processor 150 receiving the analog image data A_DATA receives the A / D sample clock signal S_CLK output from the scanner controller 151 and transmits the analog image data A_DATA transmitted from the CCD 161. ) Is sampled according to the A / D sample clock signal S_CLK and converted into digital data D_DATA.

Digital data D_DATA, which is changed from the A / D converter 152, is applied and processed by the scanner controller 151 to generate pixel data P_DATA and an IP control signal IP_CONT for processing the same. Will print. The pixel data P_DATA and the IP control signal IP_CONT output from the scanner controller 151 are received and processed by the image processor 153 to process the processed data PROC_DATA and the timing data T_DATA. ) To the scanner controller 152.

According to the processed data PROC_DATA and timing data T_DATA applied to the scanner controller 152, the scanner controller 152 generates the generated data and temporarily stores them in the image memory 170. FIG. Through this continuous operation, the document 1 is scanned.

When the scan operation is completed, the scanned video data is converted into matrix data by vertically scanned by the rasterizer 180 under the control of the CPU 120 and then transferred to the PC 200 for storage. Or, it is transmitted to the outside through PSTN network and used as fax data.

As described above, the present invention provides a shuttle type scanner in which an apparatus equipped with a shuttle type scanner corrects a magnification error of a shuttle type scanner having a variable magnification error within a certain range using a specific external pattern and an image processing algorithm. Stable management of the magnification error of the type scanner has the effect that can be corrected at any time in software.

Claims (4)

Determining whether magnification correction mode is selected when the multifunction device equipped with the shuttle type scanner is driven; Scanning a specific sheet area when the magnification correction mode is selected in the step of determining whether the magnification correction mode is selected; Calculating a magnification error using the result when the specific sheet area is scanned in the step of scanning the specific sheet area; And generating and updating a magnification factor according to the magnification error when the magnification error is calculated in the step of calculating the magnification error. The method of claim 1, The step of determining whether the magnification correction mode is selected, If the magnification correction mode is not selected, the step of deleting the last data of the slice by referring to the magnification factor during scanning, In the step of deleting the last data of the slice by referring to the magnification factor, deleting the last data of the slice by referring to the magnification factor to enlarge and correct the scanned data by a ratio with reference to the magnification factor during image processing; , Magnification error due to a specific sheet in the shuttle type scanner, characterized in that the step of transmitting the corrected scan data to the PC or PSTN network in the step of expanding and correcting by the ratio by the reference to the magnification factor in the image processing Compensation method. The method of claim 2, The step of transmitting the corrected scan data to the PC or PSTN network, Determining whether the scanning operation is finished when the corrected scan data is transferred to the PC or PSTN network; If it is determined that the scan job is not the end of the scan job, a return step for re-executing the step of deleting the last data of the slice with reference to the magnification factor is further added. Compensation method for magnification error due to a specific sheet in a shuttle type scanner characterized in that the configuration. The method of claim 1, In the step of scanning the specific sheet area, the characteristic sheet scanned to perform the magnification correction operation is configured at intervals equal to the resolution of the shuttle type scanner. Error compensation method.

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