JPH0227488A - Error correcting system - Google Patents

Abstract

PURPOSE:To prevent an error recognition ratio from deteriorating at the time of error generation in picture information by interpolating the section between terminations to cross an error area whose contour or a center line is obtained when at least one of the extracted contour or center line is received. CONSTITUTION:A FAX receiving means 1 receives the picture information sent from a facsimile, the encoded picture information is converted into read picture information (black and white are expressed as '0', '1', etc.), and added to a contour extracting means 2. When the error is generated in the FAX receiving means 1, the contour extracting means 2 obtains the contour, for example the center line of the line in the case of a character information, from the received picture information excluding the error area. To an error line interpolating means 3, the data to express the error area detected at the time of reception by the FAX receiving means 1 are added, and when a line segment obtained by the contour extracting means 2 makes contact with the error area, or it curves, the error line interpolating means 3 interpolates the line segment. Thus, the deterioration of the recognition ratio can be reduced even when the error is generated.

Description

[Detailed Description of the Invention] [1 Required] Regarding an error correction method for interpolating error areas of image information, an error correction method that prevents a decrease in recognition rate and provides a high recognition rate even if an error occurs in image information is provided. FAX that receives image information sent by facsimile for the purpose of providing
a receiving means; a contour extracting means for extracting at least one of a contour or a center line of the image information received by the FAX receiving means; and at least one of the contour or the center line extracted by the contour extracting means is received by the FAX receiving means. In this case, the error line interpolation means is configured to interpolate between the end points of the contour or center line that intersect with the determined error area.

[Industrial application field]

The present invention relates to an image processing apparatus, and more particularly to an error correction method for interpolating error areas of image information.

[Conventional technology]

With the development of processors, devices that process image information such as characters and graphics have been put into practical use in various fields.

In particular, in a character recognition device, image information read from an image league (image reading device) is recognized by various methods and converted into, for example, a character code.

When recognizing image information directly read from such an image league, the read information from the image league is directly added to the recognition device, so that erroneous recognition of characters, etc. due to an error in reading the image league does not occur.

However, when a read image is transmitted and recognized by facsimile or the like, there is a problem in that a transmission error occurs during the transmission stage, resulting in a disturbance in the image, and as a result, the degree of recognition LID decreases.

Particularly in facsimile transmission, since images are compressed and transmitted, a 1-bit error affects lines 1 to 4, resulting in an extremely low recognition rate even though it is just a 1-bit error. I had a problem.

Conventionally, it is possible to detect such transmission errors, so when a transmission error is detected, the image can be corrected by making the line where the error occurred the same as the previous correctly transmitted line. A method was used to minimize disturbance.

[Problem to be solved by the invention]

However, in such cases, that is, when recognizing characters, figures, etc., the recognition target is deformed, so it has not been possible to prevent erroneous recognition caused by errors.

In view of the above conventional drawbacks, it is an object of the present invention to provide an error correction method that prevents a reduction in recognition rate and provides a high recognition rate even if an error occurs in image information.

[Means to solve the problem]

FIG. 1(a) is a block diagram of the first principle of the present invention, and FIG. 1(b) is a block diagram of the second principle of the present invention.

The FAX receiving means 1 receives image information transmitted from, for example, a facsimile machine and added through a line.

The contour extracting means 2.4 extracts at least one of the contour or the center line of the image information.

The error line interpolator Y&3.6 is connected to the contour extracting means 2.
Interpolation is performed between two points where at least one of the contour or the center line obtained in step 4 straddles or touches the error area.

The error area storage means 5 stores an error area in image information.

The character recognition means 7 recognizes the characters and figures of the image information interpolated by the error line interpolation means 6.

[For production]

The FAX receiver 'vJt1 receives the image information sent from the facsimile, converts the encoded image information into read image information (black and white is expressed as 0.1, etc.), and adds it to the outline extraction means 2. If an error has occurred in the FAX receiving means 1, the outline extracting means 2 removes the error area and extracts the outline from the received image information (image information converted based on encoded information), for example, if it is a character. Find the center line of the lines.

The error line interpolation means 3 includes data representing the area of error detected when the FAX receiving means optically transmits the data, and the error line interpolation means 3 detects whether the line segment obtained by the outline extraction means 2 touches the error area or Interpolates line segments when they span. Through this interpolation, the image information at the time of transmission can be reproduced.

Further, when the contour extraction means 4 obtains a contour or center line from the image information, and the obtained line segment is included in the error region stored in the error region storage means 5, the error line interpolation means 6 extracts the above-mentioned line segment. Interpolate within the error region from a point. This interpolation checker is added to the character recognition means 7,
The character recognition means 7 recognizes characters from the information.

Even if an error occurs, various line segments are interpolated within the area of the error, so that a decrease in the recognition rate in the character recognition means 7 can be reduced.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a system configuration of the embodiment, and FIG. 3 is an operation flowchart of the embodiment.

Fax image information from a facsimile device (not shown)
When added to the FAX receiving section 10, the FAX receiving section 10
The Xiill information is received and the encoded image is converted into, for example, a dot-compatible image (Sl). Then, the image corresponding to the dot is stored in the image memory 12.

When receiving FAX@image information, the FAX receiving unit 10 also checks for transmission errors, and if an error is detected, it stores the error, that is, the error area, in the error line position information memory 11 (S2). When the receiving section 10 receives one image and finishes receiving all of the one image (the image information for one image is stored in the image memory 12), the contour extracting section 1
The contour extraction unit 13 reads the image information stored in the image memory 12 and also reads the error line position information memory 11.
A contour excluding the area of error line position information stored in is extracted (33).

FIG. 4 is an image data diagram. When no error occurs, it is "A" as shown in Figure 4 (a), and the 4th error is displayed during FAX transmission.
Line X1. When an error occurs in X2, the image information on line XI and X2 is lost. Information indicating this area, that is, the area where the error has occurred, is stored in the error position information memory 11. And Figure 4 (
As shown in Q), the contour extraction unit 13 extracts the error line position information from the area X1. The contour of the image information excluding X2 is determined (33), and this contour information is stored in the contour intersection position information memory 16. Furthermore, at this time,
If the end points of the contour are included in the area indicated by the error line position information (the contour line may be cut by the error area), the contour extraction unit 13
), points Y1 to Y16 are stored in the contour intersection position information memory 16 (S4).

When the contour extraction section 13 extracts all contours for one image except for the error line area, the contour extraction section 13 applies a start signal to the error line partial interpolation section 14 to start interpolation processing.

When a start signal is applied to the error line partial interpolation unit 14, the error line partial interpolation unit 14 outputs the contour intersection position information memory 1.
Process S5 is performed to interpolate the error line portion with respect to the end points of the contour stored in No. 6. This interpolation is performed, for example, at the endpoints of the contour spanning the error area, for example Yl-Y2. Y4
- Interpolate by connecting Y3 with a straight line. Further, for example, each contour line extending from each point stored in the contour intersection position information memory 16 to a specific area is approximated by a high-order function, and the error line area is interpolated with the high-order curve. do.

The images extracted by the contour extraction section 13 by the error line partial interpolation section 14 are sequentially read out, interpolated by the error line partial interpolation section 14, and stored again in the image memory 14. For example, in interpolation obtained using a high-order function, the end points of the contour are connected by a curve Zl-Z8 as shown in Figure 4 (dl).Then, the contour is interpolated and the final contour is obtained. The information is added to the character recognition unit 15, and character recognition processing S
6 is done. Note that the character recognition section 15 starts when the error line partial interpolation section 14 applies an end signal to the character recognition section 15.

In this character recognition, the outline is the original image data (fourth
Since it matches very well with Figure (a)), there are few errors in recognition.

In the system configuration diagram of the embodiment shown in FIG. 2, characters are recognized in the character recognition unit 15, but the invention is not limited to this, and interpolation is performed in the error line partial interpolation unit 14. If it has been interpolated, by filling in the spaces between them, it is possible to output clean, corrected characters and figures to a printer or the like.

Furthermore, in the embodiments of the present invention, a case has been described in which an error occurs in a facsimile; however, the present invention is not limited to this. In the same way, the image information of the figure or character can be interpolated.

In the above embodiment, the outline of the black part of the image information such as characters is interpolated, but this is not limited to this. It is also possible to find the center line of the character or figure and interpolate that center line. It is possible as well.

〔Effect of the invention〕

As described above, according to the present invention, when an error area is determined, it is possible to interpolate the error area and obtain an image that substantially matches the image before the error. Furthermore, in the case of recognition, it is possible to prevent the recognition rate from decreasing.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram of the first principle of the present invention, FIG. 1(b) is a block diagram of the second principle of the present invention, FIG. 2 is a system configuration diagram of an embodiment, and FIG. 3 is an implementation diagram. Example operation flowchart, Figure 4 (a) ~
(d) is an image data diagram. ■...FAX receiving means, 2.4... Outline extraction means, 3.6... Error line interpolation means, 5... Error area storage means, 7... Character recognition means. Patent Applicant: Fujitsu Limited The first principle of the present invention, 70 diagrams, Figure 1 (Q) /$j I5 Keyword 2 1-Logic block diagram, Figure 1 (b) Flowchart Figure 3 (b) Picture 4 - Figure 9

Claims (1)

[Claims] 1) F for receiving image information sent from a facsimile
AX receiving means (1); and contour extracting means (1) for extracting at least one of the contour or center line of image information received by the FAX receiving means (1).
2), and an end point at which the contour or center line intersects the determined error region when at least one of the contour or center line extracted by the contour extracting means (2) is received by the FAX receiving means (1); Error line interpolation means (3
). 2) a contour extracting means (4) for extracting at least one of a contour or a center line of image information; an error region storage means (5) for storing an error region in the image information; an error line interpolation means (6) for interpolating between points of at least one of the contour or center line obtained by the extraction means (4); and character recognition from the image information obtained by the error line interpolation means (6). An error correction method characterized by comprising a character recognition means (7).