JPH01142890A - Preprocessing unit - Google Patents

Abstract

PURPOSE:To improve the accuracy of character reading by segmenting a character after executing the image transformation of image data by a graphic display controller (GDC). CONSTITUTION:The title unit is provided with an image processing buffer 8 for inputting and storing image data processed by the GDC 3 for reading out image data to be recognized out of image data stored in an input image buffer 2 and executing image processing so as to form a prescribed character pattern and a character segmenting circuit 10 for inputting image data stored in the buffer 8 and segmenting a character. Since character segmentation is executed after image processing based upon the GDC 3, character segmentation can be attained even for image data such as an oblique character.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention improves the cutting out of each handwritten or printed character on a sheet of paper in which diagonal characters, etc. are written. Regarding K.

[Conventional technology]

Conventionally, as this type of pretreatment unit, for example, the patent application
There is one disclosed in the publication No. 6-27512.

This transfers input image data of handwritten characters and printed characters as they are to a character cutting circuit, performs character cutting, and uses the resulting image data as preprocessed image data.

[Problem that the invention seeks to solve]

However, in conventional pre-processing knitting, the input image data is transferred as is to the character cutting circuit, so it is especially difficult to remove diagonal characters written diagonally or when a form or sheet of paper is slanted at the time of image input. In the case of a distorted input image, it becomes difficult for the character extraction circuit to extract each character.
There were cases where characters could not be recognized. For this reason, there was a problem in that special geography had to be created using a firm wafer or the like to forcibly cut out characters.

[Means for solving problems]

The present invention is provided with an image conversion section that inputs image data from an image memory and performs image conversion to form a predetermined character pattern, and a character cutting section that cuts out each character from the converted image data. It is something.

[Effect]

In the present invention, character extraction is performed after a predetermined conversion in the image conversion section, so that it is possible to perform character extraction even for diagonal characters.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1 is an input device that inputs characters written on a form or paper sheet as image data, 2 is an input image buffer that inputs and stores image data via a data line S1, and 3
is among the image data stored in input image buffer 2,
The image data to be recognized is transferred to the system address bus (
4. System data bus (hereinafter referred to as SAB) 4. System data bus (hereinafter referred to as SAB)
a graphic display controller 2 (hereinafter referred to as GDC) which performs image processing to produce a predetermined character pattern; 8 is a direct memory access address bus (hereinafter referred to as DAB); ) 6, an image processing buffer that inputs and stores image data processed in the GDC 3 via a direct memory access data bus (hereinafter referred to as DDB) T; 9, an input image buffer 2 and an image buffer 8; The image memory 10 inputs the image data stored in the image processing buffer 8 via the data line S2, compresses it using a normal compression pattern method, determines the vertical and horizontal contours of each character, and cuts out each character. Character cutting circuit (
11 is a CPU that controls the GDC 3, the image memory 9, and the SG circuit 10 via the 8AB4.5DB5.

Next, image data conversion processing will be explained with reference to FIGS. 2, 3, and 4.

FIG. 2(a) shows an example of image data input from the input device 1, and FIG. 2(b) shows an example of image data input from the input device 1. Characters are extracted from the image data shown in FIG. This is an example of contour data when

In this case, as shown in the figure, since no image processing is performed, two or more characters are integrated depending on the font etc. of the characters and output as outline data. Figures 3 and 4 show GDC3 of this embodiment.
This is a diagram explaining the image processing of aDci, and the image conversion of aDci in this case is, for example, by putting the diagonal letters such as rAynJ at the right end of Figure 2 (false) into one outline as shown in Figure 3,
This is done by distorting the characters by rotating them at an arbitrary angle and correcting them so that they become vertical characters as shown in FIG.

If you perform image processing in GDC3 in advance in this way,
It is now possible to perform character extraction even for image data such as diagonal characters, for which it was difficult to perform character extraction for each character.

〔Effect of the invention〕

As described above, according to the present invention, character extraction is performed after image data is converted by GDC, so it is possible to obtain contour information of diagonal characters, etc., which was previously impossible to recognize, and improve character reading accuracy. This has the effect of improving.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2-
)4 input image, example, (b) $a, contour data before image geography, FIG. 3 shows an example of diagonal characters, and FIG. 4 shows an example of image conversion of diagonal characters. 1Φ...Input device, 2.Fist...Input image buffer, 3
・・Q・Graphic display controller (
GDC), 4. System address bus (SAB)
, 5... System data bus (8DB), 6...
・Direct memory access address bus (DAB)
,? - Direct memory access data bus (DDB), 8 Image processing buffer, 9...
Image memory, 10...Fist/character segmentation (SG) circuit, 11
...CPU0

Claims (1)

[Claims] An image memory that inputs and stores characters written on a form, paper sheet, etc. as image data, and an image conversion that inputs image data from the image memory and converts the image so that it becomes a predetermined character pattern. What is claimed is: 1. A preprocessing unit comprising: a preprocessing unit;