JPH09247365A - Document reader - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To select a data path for rotation processing when it is necessary to rotate and output image data, and to read data from a document reading when rotation processing of image data is not necessary. (EN) Provided is a document reading device which includes means for selecting a path for compression, reduces the amount of data accumulated in a memory, and enables high-speed output. SOLUTION: A ring buffer 3 for temporarily storing parallel data converted by an S / P converter 2 for converting serial data from a document reading means 1 into parallel data.
In a document reading device having a data compression unit 5 for coding and compressing data from the ring buffer, 5 and a data storage unit 6, a page memory 7 for storing data of one page of the document read by the document reading unit. P / S converter 9 for converting parallel data into serial data again
An image selection means 10 for selecting serial data from the P / S converter 9 and serial data from the document reading means 1, and an image transfer control means 4 for controlling transfer of each data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading device, and more particularly to a document reading device in a digital multi-function peripheral having both a facsimile function and a copy function.

[0002]

2. Description of the Related Art A document reading operation takes the longest time in processing of a facsimile, a copying machine, etc., and the operation of a mechanical portion until a document placed on a document table is conveyed and converted into an electric signal. Most of the time it takes to get there. Therefore, in facsimiles and the like, in order to reduce the operation of the mechanical portion, a method of reading by aligning the conveyance direction of the document and the short side of the paper is used. However, if the sending side sends the original in parallel with the short side of the paper and the receiving side also discharges the received image in the horizontal direction, and the type of paper used in the sending / receiving device is different. However, there was a problem that the output state was not appropriate. Therefore, in Japanese Patent Laid-Open No. 6-112149, image data is temporarily stored in a memory so that a transmission image is output in the vertical direction on the receiving side even when a document is read in the horizontal direction on the transmitting side. There is disclosed a facsimile apparatus provided with a rotation reading means for reading in a direction perpendicular to the reading direction corresponding to the size of a document.

[0003]

However, in the above-mentioned conventional technique, it is not necessary to temporarily store the image data in the memory and rotate the image information regardless of whether the output image information is rotated or not. Even then, I had to read the data into memory. Therefore, there is a problem that it takes time until the transmission because the next data compression cannot be performed unless the image data is stored in the memory. Therefore, the present invention selects a data path for performing rotation processing when it is necessary to rotate and output image data, and selects a path for performing data compression from document reading when there is no need for rotation processing of image data. It is an object of the present invention to provide an original reading device that includes a selection unit, reduces the amount of data stored in the memory, and enables high-speed output.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 of the document reading apparatus according to the present invention is a document reading means for reading a document by scanning it in the main scanning direction and the sub-scanning direction. A serial / parallel converter for converting serial data from the document reading means into parallel data; a ring buffer for temporarily storing the parallel data converted by the serial / parallel converter; and a ring buffer from the ring buffer. In a document reading device having a data compression unit for coding and compressing data and a data storage unit for storing and storing the coded data, a page memory for storing data of one page of the document read by the document reading unit, A parallel / serial converter for converting parallel data on the page memory into serial data again; Characterized by comprising an image selection means for selecting the serial data from the serial data and the original reading means from the serial converter, and an image transfer control means for controlling the transfer of the respective data.

According to a second aspect of the invention of the document reading apparatus of the present invention, in the document reading apparatus according to the first aspect, when data is transferred from the document reading means to the data compression means, one line in the main scanning direction. It is provided with a synchronizing signal selecting means for selecting a synchronizing signal, a one-line synchronizing signal in the dummy main scanning direction when transferring the rotated image data to the data compressing means, and a dummy line synchronizing signal generating means. Characterize.

According to a third aspect of the invention of the image reading device of the present invention, in the document reading device according to the second aspect, the image transfer means is sub-scanned from the page memory 2 by a data transfer request from the data compression means. It is characterized by comprising data selection means for performing line data transfer and selecting data from the ring buffer and data from the page memory.

According to a fourth aspect of the document reading apparatus of the present invention, in the document reading apparatus according to the third aspect, the transfer data of the preceding line is stored in order to reduce the control load of the image transfer means. The reference data storage buffer is provided on the data compression means side.

According to a fifth aspect of the document reading apparatus of the present invention, a document reading unit that scans and reads a document in the main scanning direction and the sub-scanning direction, and serial data from the document reading unit is converted into parallel data. A serial / parallel converter for conversion, a ring buffer for temporarily storing parallel data converted by the serial / parallel converter, a data compression means for encoding and compressing data from the ring buffer, In a document reading apparatus having data storing means for storing and storing the data, a page memory for storing data of one page of the document read by the document reading means, and parallel data on the page memory are converted into serial data again. A parallel / serial converter, serial data from the parallel / serial converter, and the original data Image selection means for selecting serial data from the reading means, image transfer control means for controlling the transfer of each data, and one line synchronization in the main scanning direction when data is transferred from the document reading means to the data compression means. A document reading apparatus including a signal, a sync signal selecting unit for selecting a dummy main scanning direction one-line synchronizing signal for transferring the rotated image data to the data compressing unit, and a dummy line synchronizing signal generating unit. And an image input / output device having an image recording unit for printing an image, and the transfer destination of the serial data from the parallel / serial converter is transferred to the data compression path in the image transfer path, or And a transfer destination selecting means for selecting whether to transfer to the image recording means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a block diagram showing a first embodiment of a document reading apparatus according to the present invention. 1 is a document reading unit, 2 is a serial / parallel converter, 3 is a ring buffer, 4 is an image transfer unit, 5
Is a data compression means, 6 is a data storage means, 7 is a page memory, 8 is a rotation processing means, 9 is a parallel-serial converter, and 10 is an image selection means. When the image is not rotated in the document reading apparatus configured as described above, the serial data read by the document reading unit 1 is selected by the image selecting unit 10, and the serial / parallel converter 2 is selected.
Is converted into parallel data by. Then, after being synchronized by the ring buffer 3 and encoded by the data compression means 5,
The data is stored in the data storage means 6. Since each of these operations is processed in parallel in synchronization with the main scanning direction one-line synchronization signal S1 output from the image reading means 1, the processing can be completed at high speed.

In parallel with the data transfer paths B1 and B2 from the ring buffer 3, the output of the serial / parallel converter 2 is supplied to the page memory 7 via the data transfer path B3, and the rotation processing means 8 rotates the image. Is done
It is stored again in the page memory 7. Then parallel /
The image data rotated by the serial converter 9 is converted into serial data and supplied to the image selecting means 10. The image transfer means 4 receives the 1-line synchronization signal S1 in the main scanning direction supplied from the document reading means 1, and the ring buffer 3
To the data transfer paths B1 and B2, the data transfer path B3 from the serial / parallel converter 2 to the page memory, and the data transfer path B4 supplied from the page memory 7 to the parallel / serial converter. .
Therefore, when it is more effective to receive the rotated image at the transfer destination, that is, by receiving the original rotated by 90 °, the transferred image information can be obtained as a desired output in a state where the machine operating time is short. In this case, it becomes possible to select a rotated image prepared in advance by the image selecting means 10, compress the data at high speed, and transmit the compressed data.

FIG. 2 is a block diagram showing a second embodiment of the document reading apparatus according to the present invention. The difference from the first embodiment described above is that the synchronization signal selecting means 11 and the dummy line are used. The synchronization signal generating means 12 is provided, and the 1-line synchronization signal S in the main scanning direction output from the document reading means 1
1 and the dummy main-scanning direction 1-line synchronization signal S2 supplied from the dummy line-synchronization signal generation means 12 is applied to the synchronization signal selection means 11, and the main-scanning direction 1-line synchronization signal S1 is applied.
Alternatively, one of the dummy main scanning direction one-line synchronization signals S2 is selected and supplied to the image transfer means 4. With this configuration, the 1-line synchronization signal S1 in the main scanning direction from the document reading unit 1 is used as a synchronization signal for reading the document and compressing the data, and the rotated image data is transferred to the data compression unit 5. At the time of transfer, the dummy main scanning direction one-line synchronization signal S2 generated by the dummy line synchronization signal generation means 12 can be used. That is, in a digital multi-function peripheral or the like having both a facsimile function and a copy function, the main scanning direction 1-line synchronization signal S1 is used when reading an original by the facsimile function, and the dummy main scanning direction 1 is used for rotation processing after image reading.
By using the line synchronization signal S2, the main scanning direction one line synchronization signal S1 can be used by the copy function after the image is read by the facsimile function, and the image rotation processing and the copy function in the facsimile function can be performed in parallel. It becomes possible to do.

FIG. 3 is a block diagram showing a third embodiment of the document reading apparatus according to the present invention. Compared with the second embodiment, the parallel / serial converter 9 is shown.
Further, in place of the image selecting means 10, a data selecting means 15 is provided between the ring buffer 3 and the data compressing means 5, and data transfer paths B5 and B6 are provided from the page memory 7 to the data selecting means 15. different. Further, the image transfer means 4 uses the data transfer paths B1, B2, B3,
The signals of B5 and B6 are controlled. In the image reading apparatus thus configured, based on the data transfer request from the data compressing means 5, the image transfer means 4 controls the page memory 7 to transfer the data for two sub-scanning lines, and the data selecting means 15 transfers the ring buffer. The image transfer means 4 can collectively control the data transfer up to the data compression by the configuration in which the data which has not been subjected to the rotation process from 3 and the data which has been subjected to the rotation process supplied from the page memory 7 are selected. It will be possible.

That is, when the image rotation process is not performed, the serial data of the image read by the document reading means 1 is converted into a parallel signal by the serial / parallel converter 2 and input to the ring buffer 3. At this time, the synchronization signal selection means 11 selects the main scanning 1-line synchronization signal S1 output from the document reading means 1 and supplies it to the image transfer means 4 as a synchronization signal S3. Image transfer means 4
Is synchronized with the ring buffer 3 based on the input synchronizing signal S3 and is output to the data selecting means 1 via the data transfer paths B1 and B2. Further, the data compressing means 5 and the data accumulating means 6 compress and transmit the data. Done.

On the other hand, when image rotation processing is performed, data is accumulated in the page memory 7 from the serial / parallel converter 2 via the data transfer path B3, and rotation processing means 8 further performs rotation processing. . At this time, the synchronizing signal selecting means 11 selects the dummy main scanning direction one-line synchronizing signal S2 output from the dummy line synchronizing signal generating means 12 and supplies it to the image transferring means 4 as the synchronizing signal S3. Reference numeral 4 performs rotation processing based on the dummy main scanning direction one-line synchronization signal S3 (S2). Therefore, the main scanning direction 1-line synchronization signal S1 can be used even during the rotation process by the document reading device, and in the digital multi-function peripheral having the facsimile function and the copy function, It is possible to execute the copy function by using the 1-line synchronization signal S1 in the scanning direction.

Further, in the case of transferring the rotated image, the rotated image data accumulated in the page memory 7 is outputted to the data selecting means 15, and the input of the data selecting means 15 is a data transfer path. By controlling the image transfer means 4 so as to be B5 and B6,
The rotated image can be output to the data compression unit 5 and transmitted. Therefore, all the data transfer from the image reading to the data compression can be controlled by the image transfer means 4, and the same operation as the second embodiment can be performed.

FIG. 4 is a block diagram showing a fourth embodiment of the document reading apparatus according to the present invention. Compared with the third embodiment, the data compression means 5 stores reference data. The buffer 16 is provided to simplify the image transfer path, and the basic operation of each block is the same as that of the second and third embodiments described above. That is, the reference data storage buffer 16 stores the transfer data of the previous line. Therefore, in the above-mentioned second and third embodiments, the ring buffer 3 and the page memories 7 to B are stored.
Although data of two lines each of 1, B2 or B5, B6 was output, by holding the output of the data compression means in the reference data storage buffer 16, only the data of one line is stored in the data selection means 15. It suffices to supply the data to the data compression means 5 via the data compression means 5, and it is possible to reduce the control load of the image transfer means 4.

FIG. 5 is a diagram showing an embodiment of the image input / output device according to the present invention. As an example, the image recording means 13 and the transfer destination selecting means 14 are provided in the second embodiment. It is configured. As a result, the transfer destination of the output of the parallel / serial converter 9 is switched to the image recording means 13 by the transfer destination selecting means 14, so that the rotary printing can be performed with a simple configuration.

[0018]

As described above, in the document reading apparatus according to the first aspect of the invention, the image data is not stored in the memory in synchronization with the main scanning one-line synchronizing signal without rotating the image data, and the image data is rapidly stored in the data compressing means. The image transmission path for transferring the image and the path for storing the image in the page memory and rotating the image data when the image data is rotated are separated from each other. Data can be transferred at high speed to the data compression means.

In the document reading apparatus according to the present invention, the 1-line synchronizing signal S1 in the main scanning direction from the document reading apparatus is used as a synchronizing signal for data compression from the document reading apparatus, and the image data is rotated. When the data is transferred to the data compressing means, the dummy main scanning direction one line synchronizing signal S2 generated by the line synchronizing signal generating means is used. Therefore, in the digital multi-function peripheral having both the facsimile function and the copying function. By using the synchronous signal S1 for the original reading by the facsimile function and the synchronous signal S2 for the rotation processing, the copy function can be used even when the rotation processing is performed. You can

According to the document reading apparatus of the third aspect, the image transfer means can collectively control the transfer of the parallel data, which is advantageous in that the control becomes easy. The document reading apparatus according to claim 4 is provided with the reference data storage buffer for storing the transfer data of the previous line in the output of the data compression means, so that the image transfer path can be simplified. It is possible to reduce the load of. In the image input / output device according to claim 5, the output of the parallel / serial converter can be switched to the image recording means with respect to the image transfer path for performing the image rotation processing. Therefore, the image subjected to the rotation processing is printed. Has the advantage that

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a document reading device according to the present invention.

FIG. 2 is a block diagram showing a second embodiment of a document reading apparatus according to the present invention.

FIG. 3 is a block diagram showing a third exemplary embodiment of a document reading apparatus according to the present invention.

FIG. 4 is a block diagram showing a fourth exemplary embodiment of a document reading apparatus according to the present invention.

FIG. 5 is a diagram showing an embodiment of an image input / output device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Original reading means, 2 ... Serial / parallel converter, 3 ... Ring buffer, 4 ... Image transfer means, 5 ... Data compression means, 6 ... Data storage means, 7 ... Page memory, 8 ... Rotation processing means, 9
... parallel / serial converter, 10 ... image selecting means, 11 ... synchronizing signal selecting means, 12 ... dummy line synchronizing signal generating means, 13 ... image recording means, 1
4 ... Transfer destination selecting means, 15 ... Data selecting means,
16 ... Reference data storage buffer.

Claims (5)

[Claims] 1. An original reading unit for scanning and reading an original in the main scanning direction and the sub-scanning direction, and a serial / serial converter for converting serial data from the original reading unit into parallel data.
A parallel converter, a ring buffer for temporarily storing parallel data converted by the serial / parallel converter, a data compression means for encoding and compressing the data from the ring buffer, and storing the encoded data. In a document reading apparatus having a data storage unit for storing data, a page memory for storing data of one page of a document read by the document reading unit, and parallel / serial conversion for converting parallel data on the page memory into serial data again And an image selection means for selecting serial data from the parallel / serial converter and serial data from the document reading means, and an image transfer control means for controlling transfer of each data. Document reading device. 2. The document reading device according to claim 1, wherein when the data is transferred from the document reading means to the data compression means, the main scanning direction one-line synchronizing signal and the image data subjected to the rotation processing are sent to the data compression means. An original reading apparatus comprising: a sync signal selecting means for selecting a dummy main scanning direction 1-line sync signal for data transfer; and a dummy line sync signal generating means. 3. The document reading apparatus according to claim 2, wherein said image transfer means performs subscanning two-line data transfer from the page memory in response to a data transfer request from the data compression means, and data from the ring buffer and the page memory. An original reading device comprising a data selection means for selecting the data of the document. 4. The document reading apparatus according to claim 3, wherein a reference data storage buffer for storing the transfer data of the preceding line is provided on the data compression means side in order to reduce the control load of the image transfer means. Document reading device. 5. An original reading unit for scanning and reading an original in the main scanning direction and the sub-scanning direction, and a serial / serial converter for converting serial data from the original reading unit into parallel data.
A parallel converter, a ring buffer for temporarily storing parallel data converted by the serial / parallel converter, a data compression means for encoding and compressing the data from the ring buffer, and storing the encoded data. In a document reading apparatus having a data storage unit for storing data, a page memory for storing data of one page of a document read by the document reading unit, and parallel / serial conversion for converting parallel data on the page memory into serial data again Device, image selection means for selecting serial data from the parallel / serial converter and serial data from the document reading means, image transfer control means for controlling transfer of each data, and the document reading means. When transferring data to the data compression means, a 1-line synchronization signal in the main scanning direction An original reading device provided with a sync signal selection means for selecting a dummy main scanning direction one-line sync signal at the time of transferring the converted image data to the data compression means, and a dummy line sync signal generation means, and an image. And an image input / output device having image recording means for printing the image data, and transfers the transfer destination of the serial data from the parallel / serial converter to the path for data compression in the image transfer path, or the image recording means. An image input / output device, comprising: a transfer destination selecting unit for selecting whether to transfer the image to the destination.