JPS61290886A - Image information converting method - Google Patents

Abstract

PURPOSE:To utilize easily optional image information of a raster type by converting it to image information conforming to an NAPLPS system, by representing each picture element of an image of a raster type which is inputted with an intermediate data consisting of color information and position information, and converting it to image information consisting of a prescribed command train. CONSTITUTION:A position segmented by trimming, namely, a coordinate is read, and subsequently, whether a trimming size is non-magnification or not is decided, and in case it is not non-magnification, the number of operands of an NAPLPS code is changed, based on the trimming size. A color of one picture element is read as color information of R, G and B data, but in this case, position information of its picture element is also read. As for this position information, it will suffice that it is, for instance, an absolute coordinate of a picture element on a display. In this way, its picture elements are represented by an intermediate data consisting of color information and position information, respectively. Subsequently, this intermediate data is converted to a prescribed command train confirming to an NAPLPS system.

Description

DETAILED DESCRIPTION OF THE INVENTION C. Technical Field of the Invention The present invention relates to an image information conversion method, and particularly to an image information conversion method for converting arbitrary raster type image information into image information compatible with the NAPLPS system.

(Prior Art and its Problems) In recent years, Videotex systems have rapidly become popular. In Japan, the CAPTAIN system has been developed mainly by NTT, and in North America and other countries, the NAPLPS system has been developed. This Videotex system is characterized by the ability to exchange not only text information but also image information, but since image information cannot be transmitted by simple encoding like text information, each method is different from this system. It has its own unique method for handling image information and imposes its own restrictions. Therefore, at present, for example, images of the CAPTAIN method and NAPLP
There is no compatibility with S format images. So CA
Even if there is raster type image information of the PTAIN method, it cannot be used as is in the NAPLPS method Videotex system. In addition, computer graphics images created using personal computers, etc., which are currently rapidly becoming popular, can be directly converted into NAPLPS.
It cannot be used in the system. Therefore, in the past, when trying to use such raster image information in a NAPLPS system, it was necessary to input the same image from a camera or tablet, color it, and convert it into a command string that complies with the NAPLPS protocol. , which required a lot of effort.

(Objective of the Invention) Therefore, the present invention makes it possible to easily convert any raster type image information into N
It is an object of the present invention to provide an image information conversion method that can be used by converting image information into image information compatible with the APLPS system.

[Summary of the invention]

A feature of the present invention is that, in an image information conversion method, raster type image information is input, pixels of all or a predetermined part of the input image are extracted, and each pixel is converted into an intermediate layer consisting of color information and position information. By converting this intermediate data into image information consisting of a predetermined command string, it is possible to easily convert any raster-type image information into image information compatible with the NAPLPS method and use it. It is in.

[Embodiments of the invention]

The present invention will be described below based on illustrated embodiments. 1st
The figure is a flowchart illustrating an embodiment of the method according to the invention.

This embodiment shows a conversion method when a raster type image is used in a NAPLPS videotex system. First, raster type image information is input, and it is determined whether or not to use the entire screen (step S1). If the entire screen is to be used, the pixels making up the entire screen are scattered as appropriate to make the size an integral multiple of 200×256 pixels (step 82). Then NAP based on this size
Change the number of operands of the LPS code (step 83
). Note that this operation will be described later. On the other hand, if you use only a part of the screen, that part is 200x25
The image is trimmed to a size that is an integral multiple of 6 pixels (step S4), and the position cut out by this trimming, that is, the coordinates, is read (step 85). Next, it is determined whether the trimming size is 1 times or not (step S6), and if it is not 1 times, NAPLP is performed based on the trimming size.
The number of operands of the S code is changed (step 33).

Now you are ready to convert.

Subsequently, each pixel is converted into a command string representation compatible with the NAPLPS method. There are two main methods for expressing a command string of an image in the NAPLPS method: a method in which each pixel is treated as a point, and a method in which a set of each pixel is treated as a polygon. The former will be expressed by a point command, and the latter by a polygon command. Which representation method is appropriate depends on the nature of the converted image. The present invention relates to a method of treating each pixel as a point.

First, the colors of one pixel are R and G.

It is read as B data (step S7). This can be done by reading data on the VRAM that corresponds to the pixels displayed on the display. Currently, the relationship between the color of pixels on the display and the data on VRAM is RGB.
The relationship can be made by one of two methods: the method and the bitmap method. FIG. 2 shows the correspondence between RGB systems.

Now, if we consider the case where the display consists of 200x256 pixels as shown in the figure, the VRAM also has 200x25 pixels.
It consists of 3 branes, R, G, and B, each having 6 cells. For example, the color of one pixel P on the display is VRAM
Upper cell PR, Po.

It is expressed by a combination of R8 values. Therefore, in this case P
, P, and P can be read as they are. On the other hand, the correspondence relationship in the bitmap method is as shown in FIG. The display is 200X as shown.
Considering the case of 256 pixels, the VRAM similarly consists of 4 branes A, B, C, and D having 200×256 cells. For example, one pixel Q on the display
The colors of cells QA, Q8. It is expressed as a combination of values of Qo and Q. These values are the actual R, G, B
It does not represent the color, but the palette number. For example, if each cell has a capacity of 1 bit, a total of 4 bits, or 16 palette numbers, can be expressed. In this bitmap method using 16 palette numbers, each of the 16 colors corresponding to each palette number is defined as R5G and B in a separate table. So, first, Q.
.

It is sufficient to read the values of oB, QC, and Q, and then subtract from the table the R, G, and B colors corresponding to the palette number determined from these values and read them.

As described above, in step S7, the color of one pixel is read as color information such as R, G, and B data, and at this time, the position information of that pixel is also read at the same time. This position information may be, for example, the absolute coordinates of the pixel on the display.

In this way, each pixel is represented by intermediate data consisting of color information and position information.

Subsequently, this intermediate data is converted into a predetermined command string compatible with the NAPLPS method. First, the NAPLPS method “
"Set Cofor" command (step 88). Specifically, this creates data as shown in Figures 4(a) and (b). 1-1 is a color specification instruction code, as shown in (b) in the same figure.
Bytes 2 to 4 shown in the figure are color information data codes corresponding to the operands of this instruction. In this example, the color information data code is a 6-bit code for each of the R, G, and B values read in step S7, and is arranged in the order of GRB from the most significant bit. For example, byte 2 stores the upper two pits of each GRB. Next, set the “Pa1nt” command of the NAPLPS method (step 39
). Specifically, this means creating data as shown in FIG. 4(c)(cj). Byte 5, not shown in FIG. 4(C), is a coordinate designation instruction code, and bytes 6 to 8 shown in FIG. 4(d) are position information data codes corresponding to the operands of this instruction. In the information data code, each of the absolute coordinate XY values read in step S7 is encoded using 9 bits (X, .about.X9.Y1-Y9), and 3 bits from the most significant bits are arranged in the order of xY. The location information data code is 6 bytes in total in this example.
~ byte 8, but as the number of pixels in one screen increases, 3 bytes will not be enough, and the number of bytes that make up the operand will become longer. The operation performed in step S3 described above is an operation for determining the number of operands according to the number of pixels.

After expressing one pixel with a predetermined command string in this way, while incrementing the VRAM address,
Perform the same procedure for all pixels to be converted (
Step S10.511).

Once all pixels have been processed, select a medium for output (step 512). If floppy is selected, NAPLP
Write the command string obtained according to the format of S to the floppy disk (step 513), and if the line is selected, write the command string to R8-23.
Transfer is performed using a 2C boat, etc. (step 514)
. In this way, image information compatible with the NAPLPS method is obtained. Also, the above example is NAPLP
This is an example based on S protocol, and INCREMENT
POINT etc. may also be used.

(Effects of the Invention) As described above, according to the present invention, in the image information conversion method, each pixel of an input raster image is represented by intermediate data consisting of color information and position information, and this is converted from a predetermined command string. Since the image information is converted into image information consisting of the following, it becomes possible to easily convert any raster type image information into image information compatible with the NAPLPS method and use it.

[Brief explanation of the drawing]

Fig. 1 is a flowchart showing an embodiment of the conversion method according to the present invention, and Fig. 2 shows a display and VRAM in the RGB system.
FIG. 3 is an explanatory diagram showing the correspondence between the display and VRAM in the bitmap method, and FIG. 4 is an explanatory diagram showing an example of a command string converted by the method according to the present invention. 81-814... Each step of the flowchart, 1-8...
Each byte of the command string.

Claims (1)

[Claims] 1. Raster type image information is input, all or a predetermined portion of the pixels of the input image are extracted, each pixel is represented by intermediate data consisting of color information and position information, and this An image information conversion method characterized by converting intermediate data into image information consisting of a predetermined command sequence. 2. The image information conversion method according to claim 1, wherein the color information is expressed by the frequency of three colors, red, green, and blue. 3. Claim 1 or 2, characterized in that the position information is expressed by absolute coordinates of pixels within the screen.
Image information conversion method described in section. 4. The image information conversion method according to any one of claims 1 to 3, wherein the predetermined format is a NAPLPS videotex system format. 5. Image information for one pixel subjected to format conversion is represented by a code string consisting of a color designation command code, a color information data code, a coordinate designation command code, and a position information data code. The image information conversion method described in Section 4.