JP2002190914A - Printer capable of mounting scanner head, bidirectionally readable line scanner and bidirectional register adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer capable of mounting a scanner head, a bidirectionally readable line scanner and a bidirectional register adjustment method which shifts a resistor by minimum units for the bidirectional resister adjustment and scans a read position of an adjusting sample the number of times corresponding to the register adjustment divisions to automatically determine a register adjustment value, without checking the deviation of pixels on a display. SOLUTION: In a bidirectional reading by a scanner in the forward and backward directions, a plurality of lines drawn over a fixed scanner adjustment read region on a paper are read as a bidirectional register adjustment pattern for eliminating a read deviation, a forward and backward reading buffer arrangement is provided for a scanner register adjustment RAM area, and a value which minimizes the sum of the absolute values of brightness differences is taken as a register adjustment value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a printer on which a scanner head can be mounted, a line scanner capable of bidirectional reading, and a bidirectional registration adjustment method.

[0002]

2. Description of the Related Art Conventionally, when adjusting the registration of bidirectional reading with a line scanner capable of bidirectional reading, the reading operation is actually performed by shifting the registration by the minimum unit for shifting the registration, and the read image is read in the forward direction. The displacement of the pixel in the direction opposite to the above is viewed on the display, and the registration adjustment value when the displacement of the pixel is the smallest is determined as the bidirectional registration adjustment value.

[0003]

Conventionally, the operation of shifting the register by the minimum unit and confirming it on the display has to be repeated for the range of the register adjustment. Must be determined by the eyes of the user, which can be cumbersome, inaccurate, and cause errors.

Further, when the minimum unit of the cash register has a high resolution, there is a problem that the error is further increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when performing bidirectional registration adjustment of a printer capable of mounting a scanner head and a line scanner capable of bidirectional reading, the registration is shifted by a minimum unit. , Without scanning the pixel on the display, simply scan the adjustment sample reading position for the registration adjustment
An object of the present invention is to provide a printer capable of mounting a scanner head capable of automatically determining a registration adjustment value, a readable line scanner, and a bidirectional registration adjustment method.

[0006]

The present invention can solve the above-mentioned problems by providing the following constitution.

(1) As a bidirectional registration adjustment pattern for eliminating a reading deviation when performing bidirectional reading in the forward and reverse directions of the scanner, the pattern is drawn in a fixed scanner adjustment reading area of paper. And a line scanner capable of bidirectionally reading a plurality of lines.

(2) A bi-directional registration adjustment method for a line scanner capable of bi-directional reading, wherein the bi-directional registration for eliminating a reading deviation when performing bi-directional reading in the forward and reverse directions of the scanner. A bidirectional registration adjustment method, comprising: reading a plurality of lines drawn in a fixed scanner adjustment reading area on paper as an adjustment pattern.

(3) As a RAM area for scanner registration adjustment, a buffer array for forward reading and a buffer array for backward reading are provided. The number of arrays is determined by the resolution, and a high resolution requiring a large number of arrays is required. In the mode, registration is performed with the read area width fixed, and in the forward direction, the average value of the pixels read in the column direction is stored in the read buffer for the forward direction in ascending raster order from the smallest array in the read raster order. In the reverse direction, the average value of the pixels read in the column direction is stored in the reverse reading buffer in the order of the raster read from the larger array to the smaller array in the read raster buffer. Line scanner that can read in the direction.

(4) A bidirectional registration adjustment method for a line scanner capable of bidirectional reading, comprising a forward reading buffer array and a reverse reading buffer array as a RAM area for scanner registration adjustment. In the step of deciding the number by the resolution and in the high resolution mode requiring a large number of arrays, the registration area was fixed and the registration area width was fixed, and in the forward direction, the average value of the read pixels in the column direction was read. Storing in the read buffer for the forward direction in ascending order of the array in the raster order; and in the reverse direction, the average value of the pixels read in the column direction is read in ascending raster order in the order of the raster read. Storing in a reverse reading buffer.

(5) The scanner reading timing is shifted in an arbitrary range by a unit higher in resolution than the reading resolution in the register calculation value storage buffer, and an arbitrary register storage buffer at that time is provided and assigned to this storage buffer. value is,
This is the sum of the absolute values of the luminance differences assigned to the forward read buffer and the reverse read buffer of the same array No. The scanner bidirectional is determined by the value of the registration adjustment value when the sum of the absolute values is minimum. A printer on which a scanner head can be mounted and a line scanner capable of bidirectional reading, which are determined as a registration adjustment value for reading.

(6) A bidirectional registration adjustment method for a line scanner capable of bidirectional reading, wherein the scanner reading timing is shifted in an arbitrary range by a unit higher in resolution than the reading resolution in a registration calculation value storage buffer. The value assigned to this storage buffer is the sum of the absolute values of the difference in luminance assigned to the forward read buffer and the reverse read buffer of the same array No. A bidirectional registration adjustment method comprising: determining a registration adjustment value for scanner bidirectional reading based on a registration adjustment value when the sum of the values is minimum.

[0013]

Embodiments of the present invention will be described below.

FIG. 1 is an explanatory view showing a reading pattern for bidirectional registration adjustment in this embodiment, FIG. 2 is an explanatory view showing a configuration of a printer to which a scanner can be mounted in this embodiment, and FIG. FIG. 7A is an explanatory diagram showing an example of a forward read buffer and a reverse read buffer array when a bidirectional register is matched and not matched in FIG.
4B shows a case where the cash register is matched (when there is no displacement of the bidirectional cash register), FIG. 4B shows a case where the cash register is not matched (when there is a displacement of the bidirectional cash register), and FIG. 6 is a flowchart showing a flow of processing up to determination of a bidirectional registration adjustment value in FIG.

The present invention is applied to a line scanner which performs a reading operation by mounting a scanner on a carriage and operating the scanner left and right.

In this embodiment, an ink jet printer in which a print head can be replaced with a scanner head will be described.

FIG. 1 is a diagram showing a pattern for bidirectional registration adjustment for eliminating a deviation between forward and reverse reading when bidirectional reading by a scanner is performed. The adjustment pattern is a plurality of lines drawn in a fixed scanner adjustment reading area (arrow in the drawing) of the paper. Since the difference when the pattern of a plurality of lines deviates from that of one line is larger, it is possible to more accurately match the patterns.

FIG. 2 is a diagram showing the configuration of a printer which can be mounted on a scanner and can be read in both directions by the scanner. Reference numeral 1 denotes a RAM of a printer to which a scanner can be attached. The RAM
1 includes a RAM area 10 for adjusting the scanner registration. Reference numeral 2 denotes a ROM of a printer to which a scanner can be attached, which stores a control program, a table related to color processing, and the like. Reference numeral 3 denotes a CPU for operating a printer to which a scanner can be attached.

Reference numeral 4 denotes an engine control unit of a printer to which a scanner can be attached, which is configured by a motor for operating a carriage (not shown), a motor for feeding paper, a motor for performing recovery processing, and the like. Further, a print head for performing printing and a scanner for performing a reading operation can be mounted on a carriage unit (not shown).

Next, a RAM area 1 for adjusting the scanner registration
0 will be described.

Reference numeral 11 denotes a read buffer array for the forward direction. The number of arrays is determined by the resolution. Since the reading area width is fixed, the number of arrays is required to be larger as the registration in the high resolution mode is performed. For example, if the number of arrays is required to be 100 in the resolution of 600 dpi to read the reading area, in the resolution of 300 dpi,
In the 50-half mode and the resolution of 150 dpi, only half the number is 25.

Reference numeral 12 denotes a reverse read buffer array. In the case of the 600 dpi mode, in the forward direction, from 0 to 99 in the array are stored in the forward read buffer in the order from 0 to 99, and in the reverse direction, from 99 in the array to 0 in the reverse order in the reverse direction.

Reference numerals 13 to 17 denote storage buffers for register calculation values, which are used to adjust the bidirectional registration by shifting the scanner reading timing in the range of -2 to +2 in units of 1200 dpi. The value assigned to the storage buffer is the sum of the absolute values of the differences between the luminances (white 255, black 60) assigned to the arrays 11 and 12 of the same array No.

Reference numeral 18 denotes the value of the registration adjustment value when the sum of the absolute values is the minimum (in the present embodiment, a value in the range of -2 to +2).
Is stored as the register adjustment value for the scanner bidirectional reading.

FIG. 3 is an explanatory diagram in the case where the values of the forward read buffer array and the reverse read buffer array near the read line in the read area are extracted.

FIG. 7A is a diagram showing values of an array for the forward direction and values of an array for the reverse direction when there is no displacement of the bidirectional registration.
(B) is a diagram showing values of an array in the forward direction and an array in the reverse direction when the registration is shifted by exactly one pixel in the forward and reverse directions.

In both (a) and (b), the values of the array read the line (the edge portion from white to black), so white, light gray, intermediate gray, dark gray, black, black, dark gray, intermediate gray The brightness is gray, light gray, and white in that order. When there is no bidirectional shift, as shown in FIG.
The values of the respective elements having the same o match. Therefore, the absolute value of the difference between the same Nos. In the forward direction array and the backward direction array is obtained, and the value at the minimum of the sum is the registration adjustment value.

The registration adjustment in the present invention has a higher resolution than the reading resolution and can be adjusted by changing the reading timing. For example, if the reading resolution mode is 600
In dpi, the read timing can be changed in 1200 dpi units.

FIG. 4 is a flowchart showing the flow of the processing of the present invention. First, in step S1, a reading area of a pattern for bidirectional registration adjustment is designated. Actually, the paper is fed to the reading area of the adjustment pattern so that the adjustment pattern can be read when the carriage operation is performed, and the register setting is performed so that the scanner reading trigger is generated within the reading range. Next, in step S2, it is checked whether registration adjustment values for all resolutions for the operation mode of the scanner have been determined. If all resolutions have been determined, the process ends. If not, the process is repeated until the following processing is determined.

However, when the registration adjustment value at the highest resolution in the operation mode is used for all resolutions, the process may be terminated when the registration adjustment value at the highest resolution is determined.

In step S3, all the registration adjustment processes are performed (in the embodiment, -2 to +2), and it is checked whether or not the processes after the next step are performed.

If all registration adjustment processes have been performed, the same process is performed for another resolution, and if not completed, the processes after the next step are continued.

In step S4, a scanner reading pattern is read in the forward direction. The average value for the pixels read by the scanner in the column direction is determined, and in step S5, the average value is substituted for the pixels read in the raster direction of the scanner in ascending order of the array. In step S6, the scanner reading pattern is read in the reverse direction at the same position as that read in the forward direction without paper feeding. Also in the reverse direction, an average value for the pixels read by the scanner in the column direction is obtained, and in step S7, the average value is substituted for the pixels read in the reverse direction in reverse order from the larger array. Step S
In step 8, the sum of the absolute values of the differences between the same array No. is obtained for all arrays in the array stored in the forward direction and the array stored in the reverse direction. In step S9, the sum is substituted for the read register tone storage buffer. Finally, in step S10, the registration tone at the minimum of the storage buffer is determined as a registration adjustment value for bidirectional use (a value of -2 to +2 in the embodiment). The value is used as the bidirectional registration adjustment value of the scanner in the EEPROM.
To memorize.

[0034]

As described above, according to the present invention,
When adjusting the bidirectional registration of a printer that can be equipped with a scanner head and a line scanner that can read bidirectionally, the registration is shifted by the minimum unit, and the adjustment sample is read without confirming the pixel shift on the display. The registration adjustment value can be automatically determined only by scanning the position the number of times corresponding to the registration adjustment.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a reading pattern for bidirectional registration adjustment in the present embodiment.

FIG. 2 is an explanatory diagram showing a configuration of a printer to which a scanner can be attached in the embodiment.

FIG. 3 is an explanatory view showing an example of a forward read buffer and a reverse read buffer array when a bidirectional register is matched and not matched in the embodiment;
Indicates that the cash register is matched (when there is no displacement of the bidirectional cash register), and (b) indicates that the cash register is not matched (when there is a displacement of the bidirectional cash register)

FIG. 4 is a flowchart showing the flow of processing up to the determination of a bidirectional registration adjustment value in this embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 RAM 2 ROM 3 CPU 4 Engine control part 10 Scanner register adjustment RAM area 11 Forward read buffer array 12 Reverse read buffer array 13-17 Storage buffer for register calculation value 18 Storage buffer for register adjustment value determination

Continued on front page F term (reference) 2C480 CA40 CB31 5B047 AA01 BC14 CA14 CB17 DC06 EA01 EB02 EB03 5C062 AA05 AB05 AB17 AB33 AB41 AB42 AC02 AC22 AC55 AC66 AE15 BA00 5C072 AA01 BA02 MB08 RA18 WA01

Claims (6)

[Claims] 1. A pattern for a bidirectional registration adjustment for eliminating a deviation in reading when a scanner performs bidirectional reading in a forward direction and a reverse direction is drawn in a fixed scanner adjustment reading area of paper. A printer capable of mounting a scanner head, which reads a plurality of lines, and a line scanner capable of bidirectional reading. 2. A bi-directional registration adjustment method for a line scanner capable of bi-directional reading, wherein the bi-directional registration adjustment for eliminating a reading deviation when performing bi-directional reading in the forward and reverse directions of the scanner. A step of reading a plurality of lines drawn on a fixed scanner adjustment reading area of paper as a pattern for use. 3. A high resolution which requires a forward read buffer array and a reverse read buffer array as a RAM area for scanner registration adjustment, and the number of arrays is determined by the resolution, and requires a large number of arrays. In the mode, registration is performed with the read area width fixed, and in the forward direction, the average value of the pixels read in the column direction is stored in the read buffer for the forward direction in ascending raster order from the smallest array in the read raster order. In the reverse direction, a printer capable of mounting a scanner head, wherein the average value of the pixels read in the column direction is stored in the reverse reading buffer in ascending raster order in the read raster order, Line scanner that can read in the direction. 4. A bidirectional registration adjusting method for a line scanner capable of bidirectional reading, comprising:
A step of determining the number of arrays by the resolution having a buffer array for forward reading and a buffer array for backward reading as the AM area, and fixing the width of the reading area in a high resolution mode requiring a large number of arrays Check the cash register,
In the forward direction, the average value of the pixels read in the column direction is stored in the read buffer for the forward direction in ascending raster order in the read raster order, and in the reverse direction, the read pixels in the column direction are stored. And storing the average value in the reverse reading buffer in ascending raster order in which the arrays are read from the larger array to the smaller array. 5. A value to be substituted into the storage buffer for register calculation value, wherein the scanner reading timing is shifted in an arbitrary range in units of a higher resolution than the reading resolution, and an arbitrary storage buffer for register is used at that time. Is the sum of the absolute values of the luminance differences assigned to the forward read buffer and the reverse read buffer of the same array No. The scanner uses the value of the registration adjustment value when the sum of the absolute values is minimum. A printer capable of mounting a scanner head and a line scanner capable of bidirectional reading, wherein the printer adjusts a registration adjustment value for bidirectional reading. 6. A bidirectional registration adjustment method for a line scanner capable of bidirectional reading, wherein a scanner reading timing is shifted in an arbitrary range by a unit higher in resolution than a reading resolution in a registration calculation value storage buffer. It has an optional cash register storage buffer, and the value substituted into this storage buffer is the sum of the absolute values of the luminance differences substituted in the forward read buffer and reverse read buffer of the same array No. A step of determining a registration adjustment value for scanner bidirectional reading based on the registration adjustment value when the sum of the two is minimum.