JPH01160180A - Reader - Google Patents

Abstract

PURPOSE:To prevent disturbance in a picture due to noise and to attain picture reproduction with fidelity by outputting an image data subject to inversion processing by a picture element inversion means. CONSTITUTION:Three lines of image data read from a medium 1 by a read means 4 and binarized after analog-digital conversion are stored in a storage means 10. Then the picture element inversion means 12 applies inversion processing to a color in 1 bit in the center when one bit in the center of a 9-bit matrix being 3-bit each of image data is opposite in color with respect to surrounding 8-bit. Thus, the disturbance in the picture due to noise is prevented and the picture is reproduced with fidelity.

Description

[Detailed Description of the Invention] [Summary] 9 of 3 lines of image data read and binarized
The present invention relates to a reading device that can invert the center pixel of each pixel to the same color as the surrounding eight pixels, and the object of the present invention is to provide a reading device that can reproduce a faithful image by preventing image disturbances caused by noise, etc. a reading means for scanning an image written on a medium in a main scanning direction and a sub-scanning direction with an image sensor, converting the read image data from analog to digital, converting it into binary data, and outputting the binarized data for each line in the main scanning direction; storage means for storing 3 lines of image data, and a 9-bit matrix of 3 bits each of the stored 3 lines of image data; The image forming apparatus is configured to include pixel inverting means for inverting the central 1-bit color, and to output inverted image data.

[Industrial application field]

The present invention relates to a reading device used in a facsimile (hereinafter referred to as FAX) device, etc., and in particular inverts the center bit of every 9 bits of 3 lines of read and binarized image data to the same color as the surrounding 8 bits. The present invention relates to a reading device capable of reading data.

Recently, fax machines and optical character readers (Opti-c
alCharacter Reader:hereinafter referred to as OCR
The configuration of the reading system used in image reading devices such as
The image sensor is composed of an image sensor such as a COD (hereinafter referred to as COD), and if noise or the like enters the read data, the image will be distorted, so a method to prevent this is desired.

[Conventional technology]

FIG. 5 shows a block diagram of the FAX machine. Since the FAX machine has a sending/receiving function, the functions of the sending side and the receiving side will be explained using the same figure.

In the figure, the reading unit 4a includes a contact type image sensor 40. Analog/digital (hereinafter referred to as A/D) converter 411 Image processing circuits 42 and 2
A value converting circuit 43 is provided.

From the panel, enter the phone number, etc. of the third party you wish to send the message to.

Then, when the receiving station is called and ready for reception, the main control section 2 controls the document 1a to be sent out by a feeding mechanism (not shown), and the document 1a is read by the image sensor 40 of the reading section 4a, and A/D conversion is performed. After, image processing circuit 4
2 to emphasize the level difference, further binarized by the binarization circuit 43, compressed by the compression unit 5 and stored in the image data memory 6, and outputted from the transmitting/receiving unit 7 to the line for the receiving station. Sent out.

On the receiving side, the received (δ) image data is expanded by an expansion section 8 and recorded on recording paper by a recording section 9.

In the image processing of the image data read from the document 1a by the image sensor 40, for example, as shown in FIG. As shown in Part 6), for example, in the image processing circuit 42, a level 7 pixel surrounded by level 3 or level 4 is converted to level 10, and the difference is further widened and emphasized. For example, by slicing at level 8 and binarizing the pixel as shown in FIG. 6(C), the pixel of interest becomes 1. In this way, processing is performed to prevent thin line removal and the like from occurring.

[Problem that the invention seeks to solve]

According to the conventional method described above, the level difference between the pixel of interest and surrounding pixels in the image processing circuit is emphasized to prevent thin lines from being removed, but when there is a slight level difference due to noise etc. However, since this is emphasized, there is a problem in that the image becomes distorted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reading device that can reproduce faithful images while preventing image disturbances caused by noise and the like.

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, l is a medium, 4 is an image written on the medium 1, which is scanned by an image sensor in the main scanning direction and the sub-scanning direction, and the image data is converted from analog to digital and then binarized, and the image data is converted into a binary image in the main scanning direction. reading means for outputting each line; lO is a storage means for storing three lines of image data output from the reading means 4; 12 is a storage means for storing three lines of image data stored in the storage means 10; When the 1 bit at the center of a 9-bit matrix is the opposite color to the surrounding 8 bits, the 1 bit at the center
This is pixel inversion means that inverts the color of bits.

Therefore, it is configured to output image data that has been inverted by the pixel inverting means 12.

[Effect]

When three lines of image data read from the medium 1 by the reading means 4 and binarized after analog-to-digital conversion are stored in the storage means 10, the pixel inversion means 12 converts the image data into 9 bits of 3 bits each. When the central 1 bit of the matrix is the opposite color to the surrounding 8 bits, the color of the central 1 bit is inverted and output to prevent image disturbances due to noise and reproduce faithful images. be able to.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 2 to 4. The same reference numerals indicate the same objects throughout the figures.

Further, in FIG. 2, parts corresponding to those in FIG. 1 are surrounded by a dashed line.

FIG. 2 shows a block diagram of a portion of the FAX machine related to the present invention. In the figure, the line memory 10a stores three lines of image data output from the binarization circuit 43 of the reading section 4a.

Shift registers lla to llc are line memory 10a.
Then, as shown in FIG. 4(a), three bits of each line of three lines are sent. Thereafter, each bit is latched. Each of the shift registers 11a to 11c outputs three bits at a time and sends them to the detection circuit 12.

The detection circuit 12a detects whether the peripheral 8 bits excluding the central 1 focus of each of the 3 bits sent from the shift registers lla to llc are all "1" or "0", that is, whether they are of the same color. When all the bits are the same color, the central 1 bit is made the same color as the 8 bits and outputs ``1'' or ``0'' regardless of whether it is ``1'' or ``0''. All 8 bits are “
If it is not ``1'' or ``O'', the ``1'' or ``0'' of the central l via is output as is. In other words, the peripheral 8 bins!
・If all of the 8 bits are the same color but the 1 bit in the center is a different color, it is inverted and outputs the same color as the 8 bits, and if all 8 bits are not the same color, the color of the 1 bit in the center is output as is.

Since it has such a configuration and function, the operation will be explained with reference to the flowchart in FIG. 3.

(2) First, the image data read by the image sensor 40 is A/D converted, the level difference is emphasized by the image processing circuit 42, and the data is further binarized and sequentially sent to the line memory 10a to be stored in three lines. From then on, the data is sent one line at a time.

■Three bits of each three lines of image data from the line memory 10a are transferred to shift registers 11a to 11a for each line.
The data is sent to the lc and thereafter latched one bit at a time.

(2) Each of the shift registers lla to lie outputs 3 bits at a time and is sent to the detection circuit 12a.

(2) The detection circuit 12a detects whether all of the 8 bits sent are "1" or 60", and if the colors are the same, the central 1 bit is set to "1" or 0 and output. That is, as shown in FIG. 4(b), the central 1 bit is inverted to the same color as the surrounding 8 bits.

■If the detection result is "no", the central 1 bit is output in the same color.

■Thus, when the flow from ■ to ■ is manipulated and output up to 3 lines of Q Hiiragi, one line is completed, and the image data binarized by the flow of ■ is sent to the line memory 10a and stored. The process advances one line at a time and the flow from ■ is repeated.

(2) The image data output from the detection circuit 12a is compressed and stored in the image data memory 6, and then transmitted.

In this way, if the detection circuit 12a detects that the 8 bits around the 1 bit of interest are all white or black, the 8 bits will be the same color even if the color of the 1 focused bit in the center is the opposite color. Since the image is converted, image distortion caused by noise or the like can be prevented, and faithful image reproduction can be performed.

In the above example, the case of a FAX machine has been described, but the present invention can be similarly applied to any image reading device such as an OCR or a barcode reading scanner.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to prevent image distortion and reproduce a faithful image without outputting black dots on a white background or white dots on a black background with emphasis due to noise etc. There is an effect.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the present invention, Fig. 2 is a block diagram of main parts showing an embodiment of the present invention, Fig. 3 is a flowchart of the embodiment, Fig. 4 is an explanatory diagram of the embodiment, and Fig. 5 is FIG. 6 is a block diagram of a FAX machine showing a conventional example (This is an explanatory diagram of a conventional example. In the figure, 1 is a medium, 1a is a document, 4 is a reading means, 4a is a reading section, 10 is a storage means, 10a is a line memory, 112 to 112 are shift registers, 12 is a pixel inverting means, and 12a is a detection circuit. After Ia Ibini I, Q Iku゛[/J
aL E'ff '2J No. 6

Claims (1)

[Claims] The image written on the medium (1) is scanned and read by an image sensor in the main scanning direction and the sub-scanning direction, and the image data is converted from analog to digital and then binarized to form lines in the main scanning direction. a reading means (4) that outputs each line of image data; a storage means (10) in which three lines of image data outputted from the reading means (4) are stored;
10) Pixel inversion that inverts the color of the central 1 bit when the central 1 bit of a 9-bit matrix of 3 bits each of the 3 lines of image data stored in 10) is the opposite color to the surrounding 8 bits. A reading device comprising: means (12), and outputting image data inverted by the pixel inverting means (12).