JPH02267592A - Reduced character display device - Google Patents

Abstract

PURPOSE:To easily make binary character image data readable even if it is reduced and to eliminate the need of specially binary holding image data by providing a filter circuit for converting the character image data to multilevel image data in accordance with a reduction rate. CONSTITUTION:When a character code is inputted, binary character image data of a regular size is generated by a character generating circuit 1. A filter circuit 2 converts a local area of the binary character image data corresponding to a reduction rate to multilevel data to which a display means 3 can correspond. The multilevel data generated with regard to all the local areas becomes multilevel-reduced character image data, and by displaying it on a display means 3, an easily readable-reduced character can be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a reduced character display device that displays reduced characters such as Chinese characters with a large number of strokes in an easy-to-read manner.

2. Description of the Related Art Conventional reduced character display devices obtain binary reduced character image data from 211M character image data by a known interrogation method.

Problems to be Solved by the Invention For this reason, when binary character image data is reduced in a conventional reduced character display device, it becomes difficult to distinguish the character shape of the binary character image data after scaling.

It was especially difficult to distinguish the shape of characters with many strokes, such as kanji. Further, in order to avoid the jump processing, the reduced characters are held as image data, and when the reduced characters are generated by the character generation circuit, an extra memory for the reduced character image data is required.

In view of the above, an object of the present invention is to provide a reduced character display device that is easy to read even when binary character image data is reduced, and does not require special storage of image data for reduced characters.

Means for Solving the Problems In order to achieve the above object, the reduced character display means of the present invention includes a character generation means that generates binary character image data when a character code is input, and a character generating means that generates binary character image data when a character code is input. The image forming apparatus includes a filter circuit that converts the image into multi-value character image data according to a reduction ratio, and a display means that displays the multi-value character image data that has passed through the filter circuit.

Operation In the reduced character display device of the present invention configured as described above, when a character code is input, 26-value character image data of normal size is generated. The filter circuit converts a local region of the binary character image data according to the reduction ratio into multi-value data that can be handled by the display means. The multivalued data generated for all local areas becomes multivalued reduced character image data, and by displaying it on the display means, it becomes possible to display reduced characters that are easy to read.

Embodiment FIG. 1 is a block diagram showing the operation of a reduced character display device in an embodiment of the present invention. In the figure, l is a character generation circuit that generates binary character image data when a character code is input. , 2 is a filter circuit for converting binary character image data into multi-value image data according to the reduction ratio, and 3 is a display means for displaying the multi-value character image data passed through this filter circuit.

The operation of the character processing device of this embodiment configured as described above will be described below.

FIGS. 2a and 2b show examples of character image data in this embodiment. Figure a shows the 16 characters generated by the character generation circuit.
Dot character image data is shown, and 4 is a local area to be divided when reducing 16 dot character image data to 8 dot character image data. FIG. 2 shows 8-dot multivalued character image data generated by the filter circuit 2, and FIG.
8-dot reduced character image data in a conventional example shown for comparison is shown, and the number in each image data indicates the depth of one pixel.

Fig. 3 shows an example of the number of filters in the filter circuit in this embodiment, and Fig. 3a shows a local area of a 16-dot character image, and Fig. 3 shows a local area when obtaining a half-split lowercase letter. This shows a function to obtain one pixel value of reduced character image data generated for a given character image.

The pixel value at point (N, M) of the reduced character image data is P
(N, M), p (2 trees N, 2 zero M), p (2
between zero N + 1.2 lines), p (2 lines N, 2 zero M + 1),
p (2 zero N + 1.2 zero M + 1) indicates the pixel value of local area 4 The pixel position in the 0 character image data is 0 character image data normalized by 1 pixel of reduced character image data 4 with the upper left corner as the origin is binary, so p < x, y)
=1.0.

In this half-split lowercase character display example, when 44 points in 29 character codes are input to the character generation circuit l, the character generation circuit l generates character image data (Figure 2 a) consisting of binary 16 x 16 pixels. If the 0 local area 4 to be generated is 2 square areas, then if the local area 4 is considered as 1 pixel, 8
The filter circuit 2 applies a filter function to the 0 local area 4 from which reduced character image data consisting of x8 pixels is obtained,
A pixel value corresponding to the local area 4 is obtained, and the filter circuit 2 performs calculations on the entire local area 4 to obtain half-open lowercase image data (FIG. 2b). The display means 3 displays the reduced character image data. The reduced character image data (Fig. 2 C) in the conventional example is 2x
It was obtained by a known simple m-subtraction method in which the pixel value of the corresponding reduced character image data is set to 1 when there is a pixel with the value l in a 2-square area.

As described above, according to this embodiment, reduced multivalued character image data can be obtained from 2W character data with a simple configuration, and reduced characters that are easy to read can be displayed at high speed.

Note that in this example, the sum of pixel values in the local area was taken as the filter interval number, but if the depth of one pixel of the reduced character image data is normalized by the number of binary pixels in the local area, the character image data ( The data amounts of FIG. 2a) and the reduced character image data (FIG. 2b) are equal. Furthermore, a known error diffusion filter or the like may be used as the number of filters. In addition, when displaying a mixture of normal characters and reduced characters, normalize the pixel value 0 of the normal characters as the minimum pixel value of the reduced characters, and the pixel value l of the normal characters as the maximum pixel value of the reduced characters. Mixed display possible.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, multi-value reduced character image data can be obtained from binary character image data with a simple configuration,
This makes it possible to reduce the distortion of character shapes on display compared to the conventional binary reduced character image data that is simply simplified. In addition, multi-value reduced character images retain more outline information than 2fli reduced character images, and humans recognize characters based on character outline information, so even if the characters are the same size on display, Multivalue reduced characters are easier to recognize than value reduced characters, and even smaller characters can be read.

Furthermore, the components of the present invention do not require large-scale components and can be implemented with a small device. Therefore, a very effective reduced character display device can be realized, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of a reduced character display device according to an embodiment of the present invention, and FIG. 2 is a diagram showing character image data in the same embodiment and character image data in a conventional example. , FIG. 3 is an explanatory diagram of the operation of the filter circuit in the same embodiment. 1... Character generation circuit, 2... Filter circuit, 3...
-Display means, 4...local area.

Claims (1)

[Claims] a character generating means that generates binary character image data when a character code is input; a filter circuit that converts the binary character image data into multi-value image data according to a reduction ratio; A reduced character display device comprising a display means for displaying character image data, and generating multi-value reduced character image data from binary character image data.