KR20060006652A - Image scanning apparatus with document size detecting function and the facsimile using the same - Google Patents

Abstract

The present invention relates to an image reading apparatus having an original size sensing function and a simulated transmission apparatus using the same, the present invention comprising: a document guide for aligning with left and right sides of an original to be read; Conveying means for conveying an original; Reading means for reading the conveyed document; A position indicator, which is connected to the document guide and whose one end is located on the reading means; An image reading means including a control unit for controlling the operation of the device, wherein the control unit reads the position indicator, determines the movement amount of the document guide, and then, based on the determined movement amount, the controller reads the position amount as much as the movement amount. The present invention provides an image reading apparatus having an original size sensing function, which performs post-processing on a margin area corresponding to a distance to perform reading according to an original size.

According to the present invention, since the device can detect the size of the original to be read by the device by the original read sensor without using a separate original size detection sensor or a mechanism, the manufacturing cost can be maintained at low cost.

Image Reading, Scanning, Original Size, ccd

Description

Image reading apparatus with document size detecting function and the facsimile using the same}

1 is a perspective view showing a conventional document transfer type simulation transfer device.

FIG. 2 is an exploded perspective view showing a state where a cover of the simulated transmission device shown in FIG. 1 is removed.

FIG. 3 is a state diagram schematically illustrating a state in which documents of various sizes are mounted in the simulation transmitting apparatus shown in FIG. 1.

Fig. 4 is an equivalent view of Fig. 2 showing a document transfer type simulation transmission device having an embodiment of an image reading apparatus according to the present invention.

FIG. 5 is a diagram corresponding to FIG. 3 for the document transfer simulation transfer device shown in FIG. 4.

FIG. 6 is a flowchart for explaining the operation of the document transfer simulation transfer device shown in FIG.

<Explanation of symbols for main parts of the drawings>

10... Facsimile, 11... cover,

12... Manuscript guide, 17. Loading table,

22. Pickup roller 23. Feed roller,                 

25…. Floodlight, 27. Image sensor,

P1... LTR size original, P2.. A4 sized manuscript,

30. Fixing means, 32... tag.

The present invention relates to an image reading apparatus having an original size detection function and a simulation transmission apparatus using the same, and more particularly, to detect abnormally the size of an original to be read, thereby preventing abnormal transmission due to a difference in paper size, and The present invention relates to an image reading apparatus which can be adjusted in size and to a simulation transmission apparatus using the same.

In a device having a function of reading an original, digitally imaging and storing or transmitting the original, such as a copying transmission device, a digital copying machine, a digital multifunction device, and the like, the image reading device serves to read the original. In the case of a general image reading device, light emitted from a light source is received through a sensing sensor and digitally imaged. A line sensor system that reads an article line by line is common for efficiency of price and information processing. The line sensors are typical of Charge Coupled Device (CCD), Contact Image Sensor (CIS), etc., and are classified into A3 / A4 largely according to the original width that can be read at a time.

Among them, the A3 image line sensor is more expensive than the A4 image line sensor, and the size of the mounted device is also larger, so it is used for high-performance / high-performance office equipment. Is widely used. In the case of the A4 image line sensor, most of the LTR (8.5 ″, 216mm) paper is also supported for the purpose of cost reduction and user convenience.

On the other hand, the image reading apparatus can be classified into manual type, flat plate type, and document transfer type according to the document transmission method. The passive type is a reading operation while the user moves the image reading device directly along the surface of the original, and the flat type is a reading operation while placing the original on the upper part of the transparent plate and transferring the image line sensor from the lower part of the plate, In the case of the document feed type, the image line sensor performs a reading operation while feeding the document by the document feeder from the top in a fixed state.

Referring to Fig. 1, there is shown a document transfer type simulation transmission apparatus, that is, a facsimile 10 employing a conventional general A4 image line sensor. The facsimile 10 is equipped with a cover 11 provided with various operation buttons on the top thereof, and a document guide 12 for aligning documents to be read to the rear of the cover 11. The document is loaded on the mounting table 17 between the document guides 12 and is conveyed one by one by the pickup roller 22 to pass through between the feed roller 23 and the floodlight 25. The image sensor 27 (see Fig. 3) located at the bottom reads the document.

At this time, the image sensor supports up to LTR size, which is because the width of the LTR size original P1 and the A4 size original P2 are similar, so that one image line sensor is used to simultaneously support the same. The problem arises in that the two do not coincide completely. That is, as shown in Fig. 3, the image sensor operates in the LTR width even when the A4 size original is mounted, so that the difference between the A4 and the LTR width causes the transmission of the original or near the both ends of the obtained digital image. Unnecessary edge noise is generated at the portion indicated by, and this is not only unnecessary information is stored by being transmitted or output, but also increases the amount of data to be transmitted during facsimile transmission, thereby lowering a transmission speed.

That is, when the work is performed on an A4 sized document, reading is also performed on a portion outside the width of the original, and thus an edge-type vertical black line is generated at the end of the A4 original. This vertical black line should be removed because it is not only a problem in the quality of the output, but also a major cause of significantly reducing the compression rate of the image read data in the case of facsimile transmission.

In order to solve this problem, the size of the original to be read can be detected using a separate sensor or apparatus, and processed according to the detected result. However, the A4 image sensor is mainly installed in a low-cost device. In the case of using a separate sensor or mechanism for detecting the size of the paper to be mounted there is a problem that leads to a rise in the unit price of the product.

The present invention has been made to overcome the disadvantages of the prior art as described above, without the need to install a separate original size detection sensor, such as to detect the size of the original to be mounted on the device itself of the edge noise due to the difference in the original size It is a technical problem to provide the image reading apparatus which can suppress generation | occurrence | production.                         

Another object of the present invention is to provide a document transfer type simulation transfer apparatus having the image reading apparatus as described above.

In order to achieve the above technical problem, the present invention, the document guide for aligning in contact with the left and right sides of the original to be read; Conveying means for conveying an original; Reading means for reading the conveyed document; A position indicator, which is connected to the document guide and whose one end is located on the reading means; An image reading means including a control unit for controlling the operation of the device, wherein the control unit reads the position indicator, determines the movement amount of the document guide, and then, based on the determined movement amount, the controller reads the position amount as much as the movement amount. The present invention provides an image reading apparatus having an original size sensing function, which performs post-processing on a margin area corresponding to a distance to perform reading according to an original size.

The present invention is to detect the size of the document by operating the existing image reading means without mounting a separate sensor for detecting the size of the original, after mounting a separate position indicator on the document guide, the position indication One end of the sphere is positioned above the image reading means so that the image reading means reads one end of the position indicator. When the obtained data is analyzed through the control unit, the position of the position indicator can be grasped, and the amount of movement of the document guide can be known using the relation between the preset movement amount of the document guide and the movement amount of the position indicator. It will be possible.                     

Through this, by using the detected size of the original, it is possible to remove the edge noise. That is, the part of the read data that is out of the original size may be removed by separate processing. For example, when the white shading correction is performed by the controller, the white shading correction value for the margin area is adjusted to adjust the white space. An area may be designated as a white area.

The white shading correction is applied to the read shading waveform even when the reference sheet on which the white pattern is printed is read due to the unevenness of the lamp included in the reading device within the read width section, and the unevenness of sensitivity for each pixel in the sensor. Since distortion occurs, this means correcting the original reference value accurately. This white shading correction divides the screen into several small areas and determines the density conversion function for each divided area to correct the density so that the entire screen has the same brightness, and shades during pseudo scanning. There is a method of acquiring data and performing shading correction through the same. In the present invention, the latter method is utilized.

That is, white shading correction is performed so that the data corresponding to the part outside the width of the original detected during white shading correction on the read data is uniformly white, thereby preventing edge noise from occurring. .

In addition, a method of deleting data corresponding to portions outside the width of the original of the read data for the original may be considered.

On the other hand, the position indicator may be made of a fixing means for moving the same distance by the movement amount of the document guide, and a tag attached to the end of the fixing means. Of course, the position indicator does not necessarily have to move the same distance as the movement amount of the document guide, and may be proportional to the movement amount of the document guide so that the control unit processes the same.

The present invention also provides a simulation transmission device comprising the image reading device as described above.

In addition, the present invention comprises the steps of reading out the document guide position indicator; Calculating the document guide movement amount by calculating the obtained data; Reading out the manuscript; Performing white shading correction on the read data for the original; And storing or transmitting the corrected data, and processing the read data at the time of the white shading correction to set data corresponding to the document guide movement amount at both ends of the reading means to a data value corresponding to white color. An image reading method is provided.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the image reading apparatus and the simulation transmission apparatus employing the same according to the present invention.

Referring to Fig. 4, there is shown an embodiment of a document transfer type copy transmission apparatus having an embodiment of an image reading apparatus according to the present invention. Since the basic appearance of the embodiment may utilize the apparatus of FIG. 1 described above, the same reference numerals are assigned to the same parts, and redundant description thereof will be omitted.                     

One of the pair of document guides 12 of the above embodiment is attached with fixing means 30 constituting the position indicator. The fixing means 30 is configured to be freely moved along the document guide 12 inside the main body even when the cover 11 is mounted, and as shown, the fixing means 30 is equal to the moving distance of the document guide 12. It is set to be moved by a distance. To this end, the fixing means 30 is preferably made of a material having a sufficient stiffness (stiffness).

In the embodiment of Figure 4 is exposed to the outside of the main body of the fixing means 30, an embodiment mounted inside the main body can also be considered. In this case, since the interference with the cover 11 can be reduced, more accurate movement is possible.

Referring to FIG. 5, an end of the fixing means 30 is mounted with a tag 32 to be placed on an upper portion of the floodlight 25. Therefore, when the document guide 12 is placed in accordance with the LTR size original P1, the tag 32 is located on the side of the original P1, which is the same even in the case of A4 size original P2. Is located.

Hereinafter, the operation of the embodiment will be described with reference to FIG. 6.

First, the originals are placed on the mounting table 17 and the original guides 12 are moved left and right to align the originals. For convenience of explanation, it is assumed that A4 size original P2 is read. When the setting of the document guide 12 is completed, the fixing means 30 and the tag 32 are in the right position in FIG.

In this state, preliminary scanning is performed through the reading apparatus to read the tag 32. The read data obtained in this way is transmitted to the controller, and the controller can analyze the data to determine the position of the image corresponding to the tag 32, and apply this to the relationship between the original guide movement amount and the movement amount of the tag 32. The position (L) of the guide 12 can be grasped, and the size of the original can be detected using this.

In this case, since the position of the tag 32 may be slightly different even if the same A4 original is loaded, the controller may divide the section corresponding to the width difference between the LTR and A4 into a plurality of sections to determine the position of the tag. It may be. That is, if there is an image for the tag in the leftmost section among the plurality of sections, the size of the document is determined as LTR, and the image for the tag is located in the rightmost section. If present, the size of the original is determined by A4.

At this time, the width and number of the sections can be appropriately adjusted by those skilled in the art according to the type of originals that can be read, so that the width and number of the sections are not limited to this specification.

In this state, white shading correction is performed on the data obtained by reading the entire document P2. In shading correction, the data that is inside the original width is applied to the correction value determined in the existing white shading correction operation, and the correction value that is determined as white value is forcibly applied to the data that is out of the width. Therefore, it is possible to suppress the generation of edge noise generated in the width portion of the original.

According to the present invention having the configuration described above, since the device can detect the size of the original to be read by the device by the original read sensor without using a separate original size detection sensor or mechanism, manufacturing cost can be maintained at low cost. .

In addition, since the edge portion of the original is forcibly set to white when the white shading is corrected, black lines generated at the edge portion of the original can be removed. Improved transmission speeds can be achieved.

Claims (5)

An original guide for aligning the left and right sides of the original to be read; Conveying means for conveying an original; Reading means for reading the conveyed document; A position indicator, which is connected to the document guide and whose one end is located on the reading means; An image reading means comprising a control unit for controlling the operation of the device, The control unit reads the position indicator, determines the movement amount of the document guide, and then performs post-processing on the margin area corresponding to the distance of the movement amount at both ends of the mounted reading means based on the determined movement amount, thereby making the original size. An image reading apparatus having an original size detection function, characterized in that to read in accordance with a document. The method of claim 1, And the controller controls the white shading correction value for the margin area to designate the margin area as the white area during the white shading correction. The method of claim 1, And the position indicator comprises a fixing means for moving the same distance by the movement amount of the document guide, and a tag attached to an end of the fixing means. A simulated transmission device comprising the image reading device according to any one of claims 1 to 3. Reading out the document guide position indicator; Calculating the document guide movement amount by calculating the obtained data; Reading out the manuscript; Performing white shading correction on the read data for the original; Storing or transmitting the corrected data; And processing the read data at the time of the white shading correction to set data corresponding to the document guide movement amount at both ends of the read means to a data value corresponding to white.

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