JPS58181359A - Picture data processor - Google Patents

Abstract

PURPOSE:To attain the extending and contracting process of picture data without the deterioration of the picture quality, by performing the dot conversion by taking the state of adjacent dot into consideration, and performing the dot processing for extension and contraction by a conversion table. CONSTITUTION:A picture data readout circuit 2 reads out a dot to be converted from an original picture memory 1, a dot having a prescribed size comprising adjacent dots and a matrix sequentially, plural dots in the matrix are arranged in the prescribed order and they are used as digital data. A table memory readout circuit 4 gives the digital data to a conversion table memory 3 to read out the bit pattern for corresponding conversion. Further, a conversion pattern write circuit 5 edits the conversion bit pattern into a prescribed dot matrix, and writes it in a conversion picture memory 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for processing image data.

As part of document processing by a computer, written articles are read by facsimile or the like, the obtained image data is stored, and displayed or printed as necessary.

Image data is a dot pattern that breaks down the image of a written article into minute dots, but when storing, displaying, or printing such image data, it depends on the conditions of the storage device, display device, or printer. Appropriate data processing is also required.

One such process is image enlargement/reduction processing. Image data obtained from facsimile machines etc. consists of an extremely large amount of dots, so in order to store as many documents as possible on a storage device with a limited capacity of 9, it is necessary to reduce the image data. In order to display the entire document on a display device that has a limited number of screen dots, it is necessary to reduce the image data. In order to restore and print the image data on a facsimile or printer, it is necessary to enlarge the image data. In this case, enlargement or reduction must be done without losing the quality of the image as much as possible. Simply increasing or reducing the number of data dots will inevitably lead to loss of smoothness in diagonal lines and curved areas, or loss of image detail. Furthermore, the processing of image data I must be fast enough to process a large number of dots in a short time.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image data processing apparatus that can perform image data enlargement/reduction processing at high speed without degrading image quality.

The present invention provides an original image memory that stores an image of a document that has been decomposed into dots, a converted image memory that stores an image obtained by converting the image stored in the original image memory, and a converted dot that is stored in the original image memory. An image data reading circuit that sequentially reads out a dot matrix of a predetermined size consisting of dots and neighboring dots, arranges a plurality of dots in the matrix in a predetermined order, and converts this into digital data. The conversion bit corresponding to the bit pattern of this digital data is placed at the address indicated.

a conversion table memory for storing respective bit patterns for conversion; a table memory readout circuit for applying digital data provided from the image data readout circuit to the conversion table memory and reading out corresponding conversion bit patterns; and this table. - The above purpose is achieved by an image data processing device equipped with a conversion pattern writing circuit that organizes the conversion bit pattern read by the memory readout circuit into a predetermined dot matrix and writes this dot matrix into the conversion image memory. This has been achieved.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a conceptual block diagram of an embodiment of the present invention.

In FIG. 1, 1 is an original image memory, 2 is an image data reading circuit, 3 is a conversion pattern table memory, 4 is a table memory readout cap L, s is a conversion pattern writing circuit, and 4 is a conversion image memory. It is.

In the original image storage 1, the image of the original document to be enlarged or reduced is stored as a bit pattern. The image data readout circuit 2 tries out a predetermined number of dot groups stored in the ζO memory 49, arranges them in a predetermined order, and supplies them to the table/memory readout circuit 4. The table memory reading circuit 4 reads a converted dot pattern corresponding to the given dot pattern from the conversion pattern table memory device and supplies it to the converted pattern writing circuit 5. In the conversion pattern table memory 5, conversion dot patterns for reduction or enlargement for various dot patterns are stored in advance as a table.

In the conversion table memory 5, the correspondence relationship between the dot pattern to be converted and the dot pattern for expansion or reduction is as follows.

First, to explain the case of enlargement, if one dot d per 1 as shown in Fig. 2 (,) is enlarged twice as shown in Fig. 2 (b), this enlarged dot D is 2X
It consists of 204 dots.

Corresponding dot) dO black and white to its 11 dots) D black and white If based on 9 alone, the resulting image will be coarse, so depending on the surrounding situation of dot d, the black and white of the four dots that make up dot D It is necessary to determine the combination of

For this purpose, the black and white combination of the eight dots surrounding dot d is also read to determine the black and white pattern of the four dots that make up dot D. Dot d and 8 dots around it, ie 9 dots of 3×5.

The correspondence between the various patterns formed by the dots and the pattern of the dots D is determined experimentally so that appropriate image quality can be maintained. The correspondence relationship thus determined is stored in the conversion table memory 5. Reading of this conversion table 5 is carried out as follows.

When removing the conversion table/memory SO@, first,
From the original image memory 1, output the image through path 2 ps
Nine dots of xs are read out. These dots are arranged in a predetermined order by the image data successive circuit 2KsI-- to form 9-pit digital data as shown in FIG. Since the black and white dots in this data are represented by two 1's and 0's, the read address of the conversion table method 5 can be specified using this 9-bit digital data. Conversion table menu! As shown in FIG. 4, at the address represented by each dot pattern, 4-bit dot data representing a pattern corresponding to that dot pattern is stored.

Table memory readout wA114 is given from image data translation stage II2! The bit data is given to the conversion table memory 5, the 4-bit conversion data is read out, and the conversion pattern is written.

Such dot conversion is performed one by one for all dots in the original image memory 1, and data of nine dots enlarged twice is stored in the converted image memory 6.

Next, we will explain the case where KIi* is reduced. In that case, as shown in Fig. 5, 2×2 4
5×5 that meets the dots adjacent to these dots.
The black and white of 1×1 do and g is determined according to the pattern of do and g. The correspondence relationship in this case is also determined experimentally so that appropriate image quality can be maintained.

This kind of correspondence is stored in the conversion table memory 5.
The image is stored in the image and used in the same way as in the case of image enlargement described above.

In this way, by performing dot conversion while taking into consideration the situation of neighboring dots, it is possible to perform enlargement/reduction with high image quality, and dot processing for enlargement/reduction can be performed using a conversion table. Since there are 9 ways to do this, it can be done very quickly with simple bit calculations.

The present invention has been described above with reference to preferred embodiments, but the present invention may include various embodiments within the scope of the claims.
I'll get it.

[Brief explanation of drawings]

FIG. 1 is a conceptual configuration diagram of an embodiment of the present invention, and FIGS. 2 to 5 are explanatory diagrams of the manufacturing operation shown in FIG. 1. 1...Original image memory, 2...Image data reading cap L
5... Conversion table memory, 4... Table 9 memory reading circuit, 5... Conversion pattern writing circuit, 6
...Conversion image memory.

Claims (1)

[Claims] An original image memory that stores an image of nine documents decomposed into dots, a converted image memory that stores an image obtained by converting the image stored in this original image memory, and a converted dot and its neighboring dots from the original image memory. An image data reading circuit that sequentially reads out a dot matrix of a predetermined amount, arranges a plurality of dots in the matrix in a predetermined order, and converts it into digital data. data view
) Digital data given from the image data readout circuit is stored in the conversion table memory to store conversion O viad patterns corresponding to z A table/memory readout circuit for reading out the bead pattern, and this table/memory readout circuit organize the readout bead pattern for conversion into a predetermined dot matrix and write this dot matrix to the conversion image memory. An image data processing device equipped with a conversion pattern writing circuit.