KR100248224B1 - Resolution switching apparatus capturing and transmission partial image in facsimile - Google Patents

Abstract

The present invention provides a resolution switching device for scanning a document part image of a facsimile, which enables precise scanning of a desired document portion at the time of reading a facsimile document, thereby transmitting / copying at a high resolution and scanning / transferring / copying an image of an unwanted document portion at a low resolution. It is about.

In the present invention, a facsimile apparatus for reading and transmitting a document image includes: a basic clock generator for generating clocks of different frequencies when high resolution and low resolution scanning is performed, and a clock of the generated frequency during prescan; A prescan controller for generating a clock of a desired frequency, a scanner module for precisely scanning only a desired document portion by the frequency clock, a memory region selector for selecting an area of memory, and an image of a desired document portion of the scanned document. A high resolution memory for storing data, a low resolution memory for storing image data of an unwanted document portion, and a link register for reading a document by switching the resolution between the document portions.

According to the present invention, when reading a document, a desired document portion is scanned at high resolution and an undesired document portion is scanned at low resolution, thereby saving time required for scanning and improving the scanning speed of the document.

Description

Resolution Switching Device for Scanning Facsimile Document Parts

The present invention relates to a resolution switching device for scanning a document part image of a facsimile, and more particularly, to precisely scan only a desired document part when reading a facsimile document, to transmit / copy at a high resolution, and to scan an image of an undesired document part at a low resolution. The present invention relates to a resolution switching device for scanning a document part image which can be transmitted / copied.

A general facsimile image reading device is a device added to office equipment such as a copy machine, a facsimile machine, and a multifunction machine, and the entire document is sent to the ADF (Auto Document Feeder) without having to insert or remove the document at each store when the original is read for transmission or copying of the original. When inserted, it is a device that enables reading by automatically feeding the originals in the order of the originals.

That is, the conventional facsimile image reading apparatus has a function of scanning the entire document at the maximum resolution (Maximum Resolution) for real-time transmission or for transmitting repeatedly to the memory.

The fax also transmits or receives the captured document image by a transmission / reception protocol specified for the communication line.

In general, since the reading apparatus for digitizing the image is very fast compared to the transmission speed of the communication line, the reading and the transmission speed of the image are determined by the transmission speed which becomes the bottle neck.

The high speed scan feature employed by many facsimile machines now improves document read speed by storing the read image in the frame buffer memory, rather than sending the data flow directly to a low-threaded communication line constrained by the protocol. Let's do it.

In addition, during high-speed scanning, the image of the document is pre-scanned at a low resolution to increase the scanning speed, and a preview of the pre-scanned image is provided on the user interface so that the user can select only the desired portion and perform a precise scan. A method is also proposed.

However, such a conventional facsimile image reading device has a merit that it saves transmission time and memory compared to when the user scans the entire document and transmits only the portion to which the user wants to transmit the information. When scanning and reading and transmitting a partial image, only the partial image is taken, so that all the information about the original document itself is lost.

In addition, the receiving side has disadvantages such as failing to meet this requirement when information on which part of the document was part of the original is needed.

The present invention has been made to solve the above-mentioned disadvantages, the purpose of which is to precisely scan only the desired document portion when reading the document of the fax transmission / copy at high resolution and to scan the image of the unwanted document portion at low resolution By transmitting / copying, it is possible to reduce the amount of data, save time for scanning, and improve the scanning speed of documents.

1 is a configuration diagram of a facsimile apparatus for reading and transmitting a document image of the present invention.

2 is a block diagram according to the present invention

3 is a diagram for subsampling a document image.

4 is an illustration of one embodiment for a user interface in FIG.

5 illustrates an embodiment of a link register in FIG.

6 is a view showing a low resolution region and a high resolution partial image of a transmitted document image as a result of an embodiment of the present invention;

<Description of the code used for the main part of the drawing>

201: basic clock generator 202: prescan controller

203: user interface 204: scanner module

205: low resolution memory 206: link register

207: High resolution memory

In order to achieve the above object, the present invention provides a facsimile apparatus for reading and transmitting a document image, comprising: a basic clock generator for generating clocks of different frequencies when high resolution and low resolution scanning is performed, and generated during prescan; A prescan controller for controlling a clock of a frequency and generating a clock of a desired frequency, a scanner module for precisely scanning only a desired document portion by the frequency clock, a memory region selector for selecting an area of a memory, and among the scanned documents A high resolution memory for storing image data of a desired document portion, a low resolution memory for storing image data of an unwanted document portion, and a link register for reading a document by switching the resolution between the document portions.

Hereinafter, the configuration according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a scanner module 103 for reading a document image of a facsimile, an image processing unit 102 for processing a read image, an image memory 105 for storing processed image data, and a center for controlling each system. A processing device 101, a modem 110 for converting a data format to be suitable for a transmission line, an ECP 109 responsible for controlling a peripheral protocol used when sending image data to a personal computer (PC), LCD and OPE (Operating Panel) 112 in which a number of numeric keys and menu functions are set for a user interface, a printer 108 for printing a document, and a drive controller 107 for controlling the driving of the printer. ), A line interface unit (LIU) 111 for transmitting image data to a public line network (PSTN), a system memory 106 and a raster display device 104.

Figure 2 is a block diagram according to the present invention, as shown in the basic clock generator 201 for generating a clock of different frequencies when performing a high resolution and low resolution scanning, and the frequency of the generated frequency during prescan A prescan controller 202 for controlling a clock and generating a clock of a desired frequency, a scanner module 204 for precisely scanning a desired document portion by the frequency clock, and a memory region selector 208 for selecting an area of a memory; And a resolution between the high resolution memory 207 for storing image data of a desired document portion among the documents scanned by the scanner module, the low resolution memory 205 for storing image data of an unwanted document portion, and the resolution between the document portions. It consists of a link register 206 for reading the document.

FIG. 3 is a diagram for subsampling a document image, wherein the document 301, the pixel 302 selected when subsampling is performed on the pixel having the highest resolution in the document 301, and the discarded pixel ( 303).

FIG. 4 is an embodiment of the user interface shown in FIG. 2 and includes an LCD panel 405, a document layout 402, a region of interest 401, and a function menu 404.

FIG. 5 shows an example of the link register shown in FIG. 2 and includes a high resolution memory 602, a low resolution memory 604, a link register 1 605, and a link register 2 606.

6 shows a low resolution region 602 and a high resolution partial image 603 of the transmitted document image 601 as a result of one embodiment of the present invention.

Referring to the effects of the present invention configured as described above are as follows.

As shown in FIG. 2, a shift clock for driving an image input device is required to drive the scanr module 204. The shift clock has different frequencies when performing high resolution scanning and low resolution scanning. Will use the clock.

That is, to determine the frequency of the clock, the value determined by the user interface 203 is input from the prescan controller 202 to determine the clock of the frequency, and the basic clock generator 201 controls the clock of the desired frequency to the scanner module (204).

The scanner module 204 manages an input frequency and an output memory address in the prescan controller 202. Therefore, the image scanned by the scanner module 204 outputs the value to the resolution memory. In general, the method used is a method of constantly scanning the resolution so that the value is output to one memory. Performs scanning of different areas in the middle of the operation, and outputs the divided areas of the high resolution memory 207 and the low resolution memory 205. When outputting to the memory, the value is stored in a contiguous address area, and the area is converted from the low resolution memory 205 to the high resolution memory 207 and the high resolution memory 207 to the low resolution memory 205 to ensure the continuity of the image. In this case, a discontinuous memory jump is performed using the link register 206. The link register 206 has the start address of the jumped memory, thereby preventing the image from being distorted when the output device outputs the image.

The above operation process will be described in more detail with reference to FIGS. 2 to 6.

First, a ROI (Region Of Interest) scan function is initiated via a function key and the LCD user interface 203. Therefore, the process is performed when the document is loaded and the combination of keystrokes and interfaces corresponds to a ROI scan.

In this state, when the ROI scan process is started, the scan scan controller 202 sets a subsampling ratio value as a parameter. The subsampling parameter is a parameter for determining the pixel 302 and the pixel 303 to be discarded when subsampling is performed on the pixel having the highest resolution in the document 301 as in the configuration of FIG. 3. Indicates a case of 2. By changing the parameter and the basic clock rate, the speed of the prescan can be controlled variably.

The document is then transferred and prescan is performed in synchronization with the scan rate clock determined by the subsampling parameter. The prescan is continued until the end of the document is detected. At this time, the image data being scanned is stored in the low resolution memory 205, and the prescan controller 202 has a register for incrementing and pointing to an address each time a pixel occurs.

On the other hand, the prescan controller 202 detects the end of the document and, when the prescan is finished, compares the pixel count value at that time with a table value in the database to determine the size of the document.

The pixel value prescanned as a frame is then mapped to the document layout 402 in the LCD panel 405 of FIG. Since the resolution of the document layout 402 and the resolution of the prescan document are different, a mapping function is required. In the present invention, the grayscale image of the prescan pixel is subsampled according to the resolution of the layout and binarized by an error diffusion method. Map the results to the layout and display them.

In this case, the user determines the ROI using the function key 404 and the graphic interface of FIG. 4 to determine the ROI. The coordinates of the window selected in the document layout 402 are converted into pixel count values and used as a reference for determining the start point and the end point of the fine scan. In this case, the determined pixel count value, that is, the upper left end of the window is stored in the link register 1 605 of FIG. 5, and the lower right end is stored in the link register 2 606, and the high resolution memory 207 stores image data read during the fine scan. ) And the address of the partial image.

On the other hand, if the start coordinate is set to the pixel counter, the document is remounted and a fine scan is performed. The fine scan determines the position of the partial image by comparing the pixel counter value of which the coordinates of the window are converted with the count value of the scan clock. The image data generated at this time is stored in the high resolution memory 207, and the prescan controller 202 controls the address of the high resolution memory 207. Precise scanning improves the reading speed by transferring documents without generating scan signals to the document area that is not specified by the user.

When the prescan and the fine scan are completed, the page memory in which the original is scanned has a form of a list in which the low resolution memory 205 and the high resolution memory 207 are linked.

The present invention operated as described above has the advantage of reducing the amount of data and the time required for scanning by scanning only the portion desired by the user to transmit / copy.

In addition, by transferring the desired document parts in high resolution and copying unwanted document parts in low resolution, the memory usage efficiency and document scanning speed can be improved, and the area of the memory can be divided and the resolution can be resolved through an address link without a separate device. This has the advantage of realizing a switching function.

Claims (3)

In the facsimile apparatus for reading and sending a document image, A basic clock generator for generating clocks of different frequencies when performing high resolution and low resolution scanning; A prescan controller which controls a clock of the generated frequency and generates a clock of a desired frequency during prescan; A scanner module for precisely scanning only a desired document portion by the frequency clock; A memory area selector for selecting an area of the memory; A high resolution memory for storing image data of a desired document portion of the scanned document; A low resolution memory for storing image data of an unwanted document portion; And And a link register for reading a document by switching the resolution between the document parts. The method of claim 1, And dividing a memory area storing the high resolution and low resolution image data and dividing the storage area according to a prescan mode and a fine scan mode. The method of claim 1, And the high resolution and low resolution image data can be connected and transmitted as a single document.

Images