JPH02247693A - Text image overlay device - Google Patents

Abstract

PURPOSE:To reduce a memory capacity by converting overlay text data to character fonts in one-character unit and converting the same in text line unit to image data, then overlaying the same successively on the image data to be overlaid. CONSTITUTION:The overlay text data is converted to the character fonts in one character unit by a text/image converting means 30 to successively obtain the image data of the line unit of the text. This data is ANDed with the image data to be overlaid successively by an overlaying means 31 at every line unit of the image data obtd. by the means 30 and the image data converted in the assigned position of the data is overlaid. The memory capacity to be used is drastically reduced in such a manner and the effective utilization of the memory is possible. Since the overlay position can be assigned in the line units, the processing of various kinds of the overlay information is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for overlaying text on an image using a function of converting text data into image data in a multimedia communication processing apparatus.

Diversification of communication media in recent years 9 Broadening of communication range 1 With the increase in the number of communication systems used, there is a demand for improved performance of the communication system and a larger memory capacity in the communication processing unit 4 . For this reason, communication processing devices equipped with high-performance SI and large-capacity memory are being developed, but it is also necessary to use memory efficiently.

As one of the multimedia communication processing devices mentioned above, text data (character data, in which a certain character is expressed as character code data) is converted into image data (dot pattern data, data for displaying a certain character as a dot). There is a device that overlays text on an image using a function that converts the image into a text image, but even in such a device, it is necessary to use memory efficiently.

[Conventional technology]

FIG. 4 shows a schematic block diagram of a conventional example.

In the text, encoding refers to uncompressed image data, NH/M
Compressing using a coding rule such as R means decoding, which means returning the compressed image to an uncompressed image. In the same figure, one page of overlay text data (text data (characters) to be overlaid)
, a certain character is expressed as character code data) is converted into image data (dot pattern data, which is data for displaying the certain character mentioned above as dots) that has been converted into a chast image in interface memory 1, and The uncompressed image data for one page is stored in the data buffer 2a of the expanded image memory 2. On the other hand, the overlaid image data for one page (image data to be overlaid) is stored in the interface memory 3.
The data is decoded into uncompressed overlay image data for one page and stored in the data buffer 2b of the expanded image memory 2.

Overlay is performed by taking the logical sum of the image data to be overlaid stored in the data buffer 2a and the image data to be overlaid stored in the data buffer 2b, and the overlaid image data is output from the developed image memory 2. be done. This overlaid image data is encoded by an image decoding/encoding converter 4 and output.

In this manner, the conventional overlay apparatus is configured to convert all text data for one page into uncompressed image data, and then perform a logical OR with the image data to be overlaid.

[Problem to be solved by the invention]

Generally, image data requires a large amount of memory space, and in order to store data for one A4 size page,
For high resolution images, up to 480 bytes are required. Therefore, as in the conventional device, all one page of text data is converted into uncompressed image data (one page worth of data), converted into expanded image data (one page worth of data), and stored in the expanded image memory 2. This configuration requires a large memory area, and approximately 1 Mbyte of memory is required when overlaid image data is included. In other words, the conventional device requires a memory area for two pages as the expanded image memory capacity, and there was a problem in that the use of memory for other purposes was controlled in order to secure the memory area required for the image. .

Furthermore, since the conventional device is configured to convert one page of overlay text data into uncompressed image data regardless of whether there is a margin on one page, the data buffer 2a for one page of image data is There was a problem in that a large amount of processing time was required to read and write data to and from the data, and communication processing was not carried out efficiently.

SUMMARY OF THE INVENTION An object of the present invention is to provide a text/image overlay device that can reduce the amount of memory used and efficiently perform communication processing.

[Means to solve the problem]

FIG. 1 shows an original block diagram of the present invention. In the same figure, 30
is a text/image conversion means which converts overlay text data into a character font in units of one character type to sequentially obtain image data for each line of text. Reference numeral 31 denotes an overlay means, which sequentially performs a logical OR with the image data to be overlaid for each line of the image data obtained by the text/image conversion means 30, and transfers the converted image data to a designated position of the image data to be overlaid. overlay.

[Effect]

In the present invention, each row of overlay chast data is sequentially converted into image data, and the converted image data is sequentially overlaid at a specified position of the image data to be overlaid.

Therefore, the memory for storing overlay image data can be a memo S with a small capacity in line units, and compared to the conventional example which requires the capacity of one page, this small capacity can be used for other purposes. This allows effective use of memory.

Also, since the overlay text data is converted into a character font for each character type to obtain image data for each line of text, if the number of lines of text to be overlaid is small, the margins must be converted and written to memory. First, this improves processing efficiency.

〔Example〕

FIG. 2 shows a block diagram of one embodiment of the invention.

In the figure, 10 is a host computer, which connects a text/image conversion adapter 12 for communication processing via an internal bus 11.
control. A host interface section 13 connects the host combination 1-10 and the adapter 12 to perform input/output operations. Reference numeral 14 denotes an interface memory, which is an interface for inputting and outputting overlaid image data, overlay text data, and overlaid image data. Reference numeral 15 denotes a character font extraction unit which successively converts one character of the overlay text data into a character font and extracts it. The interface memory 141 and character font extraction section 15 constitute a text/image conversion means 19. 16 is image-only memory (overlay means)
For example, a 7-onto buffer 16a that stores row by row,
It is composed of a data buffer 16b that stores one page, and develops an image. 17 is an image decoding/encoding conversion unit, which outputs overlaid image data (decoded signal);
is converted into a coded signal. A control section 18 controls the entire adapter 12 according to the flowchart shown in FIG.

In addition, in Fig. 2, the broken lines indicate the overlaid image data,
The solid line indicates the flow of overlay text data, and the dashed line indicates the flow of overlay image data. The two-dot chain line indicates the flow of the 1ljtll signal.

Next, the operation of the present invention will be explained in conjunction with the flowchart shown in FIG.

One page of overlay image data from the host computer 10 is uncompressed converted by the image decoding/encoding conversion section 17 of the adapter 12 by Ill 60 of the control section 18, and one page of overlay image data is converted into one page of overlay image data. The data is converted into overlay image data (step 50 in FIG. 5), and one page is stored in the data buffer 16b of the image-only memory 16 (step 51).

On the other hand, overlay text data for one page from the host computer 10 is supplied to the character font extraction unit 15 via the interface memory 14, where text/image conversion is performed, that is, one character of the overlay text is converted into a character. It is converted into a font and made into uncompressed image data of, for example, one line ψ position (determined by the LSI specifications) (step 52), and is stored in the image-dedicated memory 16, 7.
The data is stored in the ontobat 716a (step 53).

In this case, since one character of overlay text is converted into a character font in the character font extraction unit 15,
Overlay Step 4: If the number of lines in the text is small, convert the margin to an image and buffer it? 16a is not performed, thereby improving processing efficiency. or,
Since overlay text data is converted into image data line by line, it is only necessary to secure memory capacity for one line of overlay image data, and a data buffer for one page of overlay image data is required. (1 page of overlay image data and 4 pages of overlay image data)
- A total of 1 page + 1 line of one line of valley image data) can be used effectively.

In this way, 7 ontobatufu? 1 stored in 16a
Overlay image data for rows and data buffer 16
A logical OR is performed with one page of uncompressed overlay image data stored in ``b'' (step 54), and text is overlaid at the specified position of the overlay image. In this case, one page's worth of uncompressed overlay image data and one line's worth of overlay image data are successively ORed for each line of overlay text (No at step 55). When the overlay for one page of overlay text is completed in this way (step 55
(YES) The overlaid image data is output from the image-only memory 16, encoded by the image decoding/encoding conversion section 17 (step 56), and sent to the host computer 10 via the interface memory 14 and host interface section 13. It will be done. .

(Effects of the Invention) As explained above, according to the present invention, overlay text data is converted into a character font in units of characters, converted into image data in units of text lines, and sequentially overlaid on the overlay target image data. Therefore, the amount of memory used can be significantly reduced, memory can be used effectively, and when the number of lines of text is small, processing efficiency can be improved because image conversion of the blank space and 1 loading to memory are not performed. Furthermore, since the overlay position can be specified on a line-by-line basis, it is possible to process a variety of overlay information.

[Brief explanation of drawings]

FIG. 1 is a principle block diagram of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an operation flowchart of the present invention, and FIG. 4 is a conventional schematic block diagram. In the figure, 10 is a host computer, 12 is a text/image conversion adapter for communication processing, 14 is an interface memory, 15 is a character font extractor, 16 is an image-only memory (overlay means), and 16a
Is it 7 ontobatufu? , 16b is a data buffer, 17 is an image decoding/encoding conversion section, 18 is an &l control section, 19.30 is a text/image conversion means, and 31 is an overlay means. No. 2 Akari phi D..., diagram, Fig. 1, Fig. 2, of the present invention! Masterpiece Fu D-Nayat Figure 3

Claims (1)

[Claims] In a text/image overlay device that overlays text on an image using a function of converting text data into image data, the overlay text data is converted into a character font in units of characters, and the overlay text data is converted into a character font in units of lines of text. A text/image converting means (30) that sequentially obtains the image data of the text/image converting means (30) and the image data to be overlaid sequentially for each line of the image data obtained by the text/image converting means (30) are logically summed. A text/image overlay device comprising overlay means (31) for overlaying the converted image data at a specified position of the overlay image data.