KR100197462B1 - Reading method for image improvement of oa system - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a reading method for improving image quality in a multifunction apparatus that supports improved image quality of read data when reading a document through efficient control and buffer management of the document transfer motor.

A feature of the present invention for achieving the above objects is a motor drive interrupt (M) for driving a motor for transferring an original for reading data, and reading means for starting a reading means for reading the data from the original. A read method for performing data read from the original using a drive interrupt (S), wherein the motor is started in advance without performing data read until the motor operates in a normal state and transfers the original at a normal speed. The motor driving interrupt corresponding to the read means driving interrupt is generated before a predetermined number of predetermined interrupts occur.

As described above, the present invention overcomes the problem of repeatedly reading the same line of the original by starting the motor in advance without reading data until the motor for feeding the original is operated in a normal state when reading the original data. As a result, there is an effect of improving the deterioration of image quality generated during reading.

Description

Reading method for improving image quality in multifunction device

The present invention relates to a reading method for improving image quality in a multifunction device, and more particularly, to a reading method for improving image quality in a multifunction device for improving image degradation caused by fast data reading through efficient motor control and buffer management. It is about.

In general, an inkjet multifunction printer is a device that includes a reading unit, a printer, a modem, a computer, and the like, and prints data read from the reading unit or data transmitted through the modem to a printer or stores the data on a hard disk in the computer. .

1 is a schematic block diagram of a general inkjet composite device.

Referring to FIG. 1, a central processing unit (CPU) 1 for controlling and processing a system according to a predetermined program, and converting into electrical energy having a business card by scanning and dividing pictures or characters of documents or documents to be transmitted at regular intervals. A reading unit 2 for transmitting digital image data to the central processing unit 1, program data, protocol data, text data and recorded audio data, and accessing data under control of the central processing unit 1; Or a modem for demodulating and outputting the received input signal by modulating and outputting the data output from the central processing unit 1 under the control of the memory unit 3 and the central processing unit 1 in analog form. 4) and a code / decoding unit 5 for encoding or decoding data under the control of the central processing unit 1 for efficient processing of data input / output to the modem 4. And a network controller 6 for forming a call loop of a telephone line under the control of the central processing unit 1 and interfacing the signal of the modem 4 with the signal of the telephone line, and a plurality of keys and a display device. And a general computer 8 having an operation panel 7 for inputting various control commands and displaying the state and various information of the system under the control of the central processing unit 1, and a main memory device or an auxiliary memory device. And a conventional printer 9 capable of printing and expressing original information through an arbitrary transmission line or printing contents stored in the computer 8, and data received or transmitted through the modem 4, or memory. Data stored in the unit 3 or data stored in the main memory device or auxiliary storage device of the general computer 8 can be transferred under the control of the central processing unit 1, or stored in the storage device of the general computer 8; Output data to printer (9) Or it consists of the data read through the reading portions (2) to the buffer controller 10 which outputs to the printer (9).

In the general multifunction apparatus configured as described above, a single buffer is used to temporarily store the read data. When reading the data by the reading unit 2 and outputting the reading data through the printing unit 9, the sink is sinked. The printing unit 9, which acts as a device for receiving data from the transmitting device, monopolizes the buffer until it consumes all the read data in the buffer. At this time, the data reading device 2, which is a source generating device, attempts to store the read data at a predetermined time in a buffer under the control of the central processing unit 1, and the printing unit 9 to occupy the buffer. Wait until) runs out of data.

The source occupying the buffer (for example, a reading means) reads the contents from the conveyed document in accordance with the movement of the motor maintaining the constant velocity, but the motor further progresses when the buffer access is passed to the printing unit 9. Can not stop.

After a while, when the reading device 2 occupies the block again, the motor immediately starts to move the document. At this moment, even if an electric pulse is applied according to the response characteristic of the motor, the motor is not immediately driven. Therefore, if data reading is performed within a time when it cannot be driven, the wrong part of the original is read continuously, resulting in deterioration and deformation of the overall image quality.

Therefore, in the general MFP, the image quality is changed in the specific data reading section according to the motor starting characteristic.

Accordingly, an object of the present invention is to solve the above-described problems, and an object of the present invention is to improve image quality in a multifunction apparatus that supports improved image quality of read data when reading an original through efficient control and buffer management of an original feed motor. To provide a reading method for.

1 is a schematic block diagram of a general inkjet multifunction printer,

2 is a block diagram showing a buffer structure for improving image quality according to the present invention;

3 is a conceptual diagram illustrating a motor and a read driving interrupt.

4A to 4C are conceptual views illustrating motor and read drive interrupts according to respective cases.

5A is a conceptual diagram illustrating a motor and a read drive interrupt when no motor drive interrupt is moved.

Fig. 5B is a conceptual diagram showing the motto and the readout drive interrupt when the motor drive interrupt is moved by a predetermined amount.

6A-6C illustrate a data control flow diagram in accordance with the present invention.

* Description of the symbols used in the main parts of the drawings *

1: central processing unit 2: reading unit

3: memory section 4: modem

5: Code / Decoder 6: Network Controller

7: operating panel 8: computer

9: printer 10: buffer controller

M: Motor step setting interrupt U: Not used

S: Read interrupt T: Interrupt cycle

A feature of the present invention for achieving the above objects is a motor drive interrupt (M) for driving a motor for transferring an original for reading data, and for starting reading means for reading the data from the original. A read method for reading data from the document by using a reading means driving interrupt (S), wherein the motor is operated without a data reading until the motor is operated in a normal state and the document is transferred at a normal speed. The motor driving interrupt corresponding to the read means driving interrupt is generated before a predetermined number of predetermined interrupts are generated to start in advance.

Hereinafter, a preferred embodiment of a high speed printing method of an inkjet composite device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a diagram illustrating a buffer structure used to improve image quality, wherein an original is transferred to a data reading portion as a scan motor progresses, and accordingly 1, 2,... , N, N + 1, N + 2,... , 2N in order of poisoning. That is, the data to be filled in the buffer is line 1, line 2,... , Line N, line N + 1, line N + 2,... It is made on line 2N, and the process is repeated as long as there is a manuscript. By this process, there should be two containers that can sequentially store data in real time. This is Block 1 Block 2.

In this case, one block includes N line buffers, one line buffer is composed of W bytes, and the W value is a value determined in proportion to the resolution and the effective read width of the data read device. In addition, N is a value determined according to the size of the memory available in the buffer configuration and the section that can run at constant speed when controlling the motor.

The larger the block size is, of course, the better, but it is possible to obtain an appropriate value experimentally according to the frequency response characteristics of the motor used.

FIG. 3 is a conceptual diagram showing a motor and a reading unit driving interrupt, in which a motor step setting interrupt M for conveying a document sheet, and a motor for rotating the motor to convey the document sheet to a position to be read by the set motor step. It shows a basic interrupt service routine consisting of three types of interrupts, U which represents time and a read interrupt S which sets basic items for reading. The cycle of this service routine is T ms, and repeat ①, ②, ③, ④ during this time. Each of the interrupts described above corresponds to ①, ②, ③, and ④. Occurs every ms. In other words, configuring the interrupt subroutine in this way gives the system a T ms read time. If T = 5, a line read is performed every 5 ms, and the read data is usually stored in a buffer in a block through direct memory access (DMA).

In this case, the data is transmitted using DMA to improve the input / output speed of the data, and thus, the image quality can be improved by reducing the block occupancy time during the read operation.

4A to 4C show four cases constituting an interrupt and three cases according to the start of the DMA and the data read time. In all three cases, the interrupt driving method is different, which affects the quality of the read data and the data read time.

Meanwhile, three cases to be described below operate under the following assumptions.

First, suppose that DMA logic, which transfers the read data to the line buffer in the block, is always driven at the first interrupt (1) of the interrupt period.

In addition, assume that the number of pixels at the time of reading is 1728 pixels, and that the time for reading one pixel can be changed by dividing the clock of the central processing unit.

According to the above-described assumption, the first interrupt driving method is a case where the motor step setting interrupt M is placed on the last phase ④ as shown in FIG. 4A to proceed in the period of U, U, S, M. At this time, DMA logic starts running at ① always and basic setting for start is at read interrupt (S). When the time required to read one pixel is set to 2 ms, the time required to read one line composed of 1728 pixels is 3.456 ms. In conclusion, in the first case, when the start of the DMA driven in the next period cannot be set, the data transmission time is increased as shown in FIG.

As shown in FIG. 4B, the second interrupt driving method is the same as the first case, but only when the order of the read interrupt S and the motor step setting interrupt M is changed, the second interrupt driving method is performed in the cycles of M, U, U, and S. FIG. . At this time, ⓐ, ⓑ, ⓒ,... You can see that the data transfer is done in order.

The third interrupt driving method is a case in which only one pixel read time is shorter in the first case described above. In this case, as shown in FIG. 4C, it can be seen that the overall flow is properly performed. However, when the read method uses CIS (Contact Image Censor), the device must be sufficiently charged within 1 되어 to obtain a satisfactory input level. That is, when the reading time is made too short as in the third case, the image level may decrease.

If the motor and read drive interrupts are used as described above in Figs. 4A to 4C, as shown in Fig. 5A, the motor drive interrupts and the read drive interrupts corresponding to each block are simultaneously executed (of course, by the insertion of U). May exist). That is, the motor and read interrupts are generated the same number of times, so that blocks 1, 2, 1,... The read data is stored in. At this time, in the preferred embodiment of the present invention, the number of interrupts required for storing read data in one block is set to five.

The problem that occurs when the control is performed as shown in Figure 5a is that the block is generally occupied by a sink, such as a printer at the boundary of every block, so that the motor is stopped, the motor is started again after the block is empty. In this case, the value for the motor start is set by the motor drive interrupt, and the necessary values for reading data from the read drive interrupt are set. During the first few motor drive interrupts, the motor is slow in response and the first few interrupts You will not be able to drive immediately.

At this time, the readout driving interrupt will continue to read the data, and since the motor cannot transfer the original, the reading will be repeated as the same line is repeatedly read. do.

In the present invention, as shown in FIG. 5B, the motor is started in advance without reading data until the response of the motor proceeds to a normal state. In a preferred embodiment of the present invention, the motor counter is set to 2 so that the motor driving interrupt corresponding to the read driving interrupt always advances by the time corresponding to the occurrence of two interrupts.

6A to 6C show a flow chart of the overall data according to the present invention. In FIG. 6, since the control for all determination and processing is performed by the central processing unit 1, the word referring to the central processing unit 1 will be omitted.

First, it is checked whether the previous data of one line amount read through the reading unit 2 is completed (S1). If it is determined in step S1 that transmission of one line is not completed, all the processing ends.

If transmission of one line is completed, it is checked whether the block currently designated by the reading unit 2 is the first block (S2). That is, step 2 (S2) represents a condition under which data can be read and transmitted. In the present invention, since the data storage capacity uses two double buffers composed of N lines, the block designated by the current reading unit 2 is the first. You must verify that it is 1 block.

If it is determined in step 2 (S2) that the block currently designated by the reading unit 2 is the first block, the first block is in a blank state (the state in which no data is stored, the data is transmitted to the printer 9, etc.). (S3). Here, if it is determined that the first block is not empty, all the processes are terminated, and wait until the first block is empty.

On the other hand, in step 2 (S2) described above, it is checked whether the block designated by the current reading unit 2 is the second block if it is not the first block (S4). If it is determined in this step 4 (S4) that the block specified by the current reading unit 2 is not the second block, this indicates that the current reading unit 2 does not designate both the first and second blocks, End the process.

If it is determined in step 4 (S4) that the block currently designated by the reading unit 2 is the second block, it is checked whether the second block is empty (S5). Here, if it is determined that the second block is not empty, this indicates that both of the first and second blocks are not empty, so all the processing ends.

If it is determined in step 3 (S3) that the first block is empty or in step 5 (S5) above, the second block is empty, is the read mode activated so that the system can proceed with reading? Check (S6). If it is determined in this step 6 (S6) that the read mode is not activated, this indicates a state in which the read unit 2 is not operated, and thus all the processing is finished.

If it is determined in step 6 (S6) that the read mode is activated, the data is read in one line, the read operation is finished, and the data is transferred to another destination (the buffer of the printer 9, the internal memory unit 3, After setting basic values necessary for the transfer to the hard disk of the computer 8) (S7), it is designated to which of the N buffers the data read by the read operation is stored (S8). .

Thereafter, in order to prevent the error of data due to the shift of the pointer of the buffer, it is checked whether the designated buffer is empty (S9). If it is determined in this step 9 (S9) that the designated buffer is not empty, this means that the existing data remains in the buffer, where the existing data may be destroyed as new data is written to the buffer. Terminate all proceedings in order to protect your data.

Then, it is determined whether the position of the block to be read and stored is the last line of the block (S10). If the position of the block to be read and stored is not the last line of the block, the process branches to step 14 (S14), which will be described later.

If the position of the block to be read and stored is the last line of the block, the current counter of the lines constituting the block and the motor counter value that stores the number of occurrences of the motor drive interrupt to change the motor related variable for the next block. When the motor counter value is equal to or larger than the block counter value, the motor counter is set to 0 by comparing a block counter value indicating a location where one line of the data is stored (S11 and S12). This is to reinitialize when the motor counter value exceeds the maximum value of the block counter to perform motor control for the next block.

If the motor counter is smaller than the block counter, the motor counter is compared with a shift counter having a value that determines how much the motor interrupt proceeds before the read driving interrupt. The motor branches to the next step 27 (S27) to generate a motor drive interrupt and increment the motor counter. On the other hand, when the motor counter value is larger than the moving counter value, start addresses indicating where the designated buffer starts from the memory map for the readout driving interrupt are designated (S13 and S14). That is, step 14 (S14) is a step required when data is transmitted in a direct memory access (DMA) method in order to reduce the burden on the processor that the CPU 1 must perform.

After that, if a start address is designated, after activating logic (DMA, etc.) for data transmission (S15), the data is transmitted to the corresponding memory space (S16). Here, since the data transmission in the present invention should occur in a predetermined time unit and proceed sequentially, it is advantageous to configure the interrupt method rather than the task in terms of an operating system. That is, if it is configured as an interrupt, the control flow chart of the present invention is restarted after the set time elapses, so that data transmission can proceed within that time. When data transmission is completed and reading of one line is completed, the block counter value is reduced (S17). This is to use as a measure to determine whether data is filled in all buffers in one block as the block counter value decreases.

If the block counter value is decreased, it is checked whether the modified block counter value is '0' (S18), and if it is determined that the block counter value is not '0', this is because the current block is not in a full state. The process branches to step 24 (S24).

If it is checked that the modified block counter value is '0' (S18), and if the block counter value is '0', this means that the current block is full, and thus, a read part for setting another block It is determined through (2) whether the currently designated block position is the first block (S19). If it is determined in step 19 (S19) that the designated block position is the first block, it indicates that all the buffers constituting the first block are filled with the read data. Therefore, the first block is set to 'full'. After that (S20), the block position is changed to the second block (S21).

If it is determined in the above-described step 19 (S19) that the block position currently designated by the reading unit 2 is not the first block, it indicates that all the buffers constituting the second block are filled with read data. After setting 2 blocks as 'full' (S22), the block position is changed to the first block and designated (S23).

After setting the block, it is determined whether the line (i.e., the value of the block counter) and the moving counter value of the block currently pointed to are the same, and if the block counter value and the moving counter value are the same, it is checked whether both blocks are empty (S24). , S25).

If both blocks are empty, the motor counter value is set to -1 to set a value for starting the motor at the motor driving interrupt (S26).

Step 27 (S27) is a step dispensed in step 13 (S13), which is a step of checking whether it is smaller than the motor counter. Busy.

After the steps 26 (S26) and 28 (S28) are processed, it is determined whether the motor counter is -1, and if the motor counter is -1, the motor counter is increased (S29, S31), and if the motor counter is not -1, the motor It is determined whether the counter value is smaller than the block counter value (S29, S30).

If the motor counter value is smaller than the block counter value, the motor counter is incremented and control passes to the next step, otherwise the motor is increased and execution ends (S30, S34).

After performing step 31 (S31), it is checked whether there is an original to be read in order to read the data of the next line (S32), and when it is determined that there is an original to be read, all the processing is finished. If it is determined that there are no originals to be read in step 32 (S32), the state of both blocks is set to 'full' so that no further reading is done (S33).

As described above, the present invention overcomes the problem of repeatedly reading the same line of the original by starting the motor in advance without reading data until the motor for feeding the original is operated in a normal state when reading the original data. As a result, there is an effect of improving the deterioration of image quality generated during reading.

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will appreciate that the present invention may be modified without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Therefore, changes in the future embodiments of the present invention will not be able to escape the technology of the present invention.

Claims (10)

And a memory unit having reading means for reading data loaded on an original, a buffer for storing data read by the reading means, and a central processing unit for controlling the storage of data in the memory unit. Read data is read from the original by using a motor drive interrupt (M) for driving a motor to transfer the original when reading, and a read means drive interrupt (S) for starting a read means for reading data from the original. In the poisoning method performed, A predetermined number of predetermined interrupts for the motor drive interrupt corresponding to the read means drive interrupt to start the motor in advance without performing data read until the motor operates in a normal state and transfers the document at a normal speed. Read method for improving the image quality in the multifunction device, characterized in that the generation before the occurrence. The method of claim 1, A reading step of reading a predetermined amount of data from the original; A first step of comparing a number of occurrences of the motor driving interrupt with a block counter value indicating a capacity for storing the predetermined amount of read data in the buffer when the buffer is full by a predetermined amount; And And transmitting the read data to the buffer when the block counter value is greater than the number of occurrences of the motor driving interrupt and the number of occurrences of the motor driving interrupt is greater than the number of occurrences of the predetermined interrupt. Read method for improving picture quality. The method of claim 2, If the block counter value is not greater than the number of occurrences of the motor drive interrupt, the motor drive interrupt generation number is initialized, and if the number of generation of the motor drive interrupt is not greater than the number of occurrence of the predetermined interrupt, the motor drive interrupt is generated. Read method for improving image quality in a multifunction device. The method of claim 2, The read method for improving the image quality in the multifunction device, characterized in that for storing the data read from the reading unit in the line unit. A reading unit for reading data contained in the document, processing means for receiving data from the reading unit and performing a predetermined process, a plurality of storing data read by the reading unit, and transmitting the stored data to the processing means. A memory having a number of buffers, and a central processing unit for controlling the storage and transmission state of data in a plurality of buffers configured in the memory, and a motor for driving a motor to transfer the original when reading the data. A read method for performing data read from the original by using a drive interrupt (M) and a read means drive interrupt (S) for starting a read means for reading the data from the original. A detection process of detecting at least one buffer in which data is not stored among the plurality of buffers configured in the memory unit; A predetermined number of predetermined interrupts for the motor drive interrupt corresponding to the read means drive interrupt to start the motor in advance without performing data read until the motor operates in a normal state and transfers the document at a normal speed. Read method for improving the image quality in a multifunction device, characterized in that it comprises a reading process generated before the generation. The method of claim 5, The read method for improving the image quality in the multifunction device, characterized in that for storing the data read from the reading unit in the line unit. The method of claim 6, wherein the detecting process, A completion confirmation step of confirming whether the one-line amount of previous data read by the reading unit has been transmitted; And And a buffer designating step of designating one buffer for storing data read by the reading unit among the plurality of buffers after all of the one-line amount of previous data is transmitted. Read method for improving picture quality. The method according to claim 5 or 7, A reading step of reading data corresponding to one line from the original; A comparison step of comparing a number of occurrences of the motor driving interrupt with a block counter value indicating a capacity for storing the predetermined amount of read data in the buffer when the buffer is full by a predetermined amount; And And a data transfer step of transmitting the read data to the buffer when the block counter value is greater than the number of occurrences of the motor driving interrupt and the number of occurrences of the motor driving interrupt is greater than the number of occurrences of the predetermined interrupt. Read method for improving picture quality. The method of claim 8, If the block counter value is not greater than the number of occurrences of the motor drive interrupt, the motor drive interrupt generation number is initialized; Read method for improving image quality in a multifunction device. The method of claim 8, If the data read by the reading unit is all stored in the buffer, the buffer is set so that the buffer cannot store any more data, and then the other one of the plurality of buffers is searched for another buffer in which no data is stored. And setting the state of the other buffer so that the other buffer can store the data read by the reader.