JPH01171068A - Image data access method - Google Patents

Abstract

PURPOSE:To execute a transferring for the unit of a line without executing the transferring for the unit of planes, attain a high speed processing and to facilitate edition for the unit of lines by providing an address converting circuit and converting the address of data so that an access can be executed in each same line number of a bit map memory. CONSTITUTION:The address of the bit map memory, which is composed of plural plane memories to store multi-value data, can be accessed in each same line number by providing an address converting circuit 1. Namely, the real bit map memory (image memory), for which the respective plane memories are composed of line data to be stored in the order of lines, is converted to a memory, in which the data of the same line number in the respective planes are arranged in the order of plane numbers for the unit of lines and a data group in the order of planes is arranged in the order of the line number, through the address converting circuit 1. Thus, the data for one line can be processed with one time command and a processing time can be wholly speeded up.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to an image data access method that converts the addresses of a plurality of plane memories storing multivalued data so that the data can be accessed line by line. Configure memory in units of 1
The purpose is to provide a method that makes it possible to process one line of data with a single command, and the unit data that makes up the multi-level data is stored in memory units at the same location in each of multiple plane memories. [Industrial Field of Application] The present invention is characterized in that an address conversion circuit is provided in a bitmap memory to convert the address of the data so that each line number of the bitmap memory can be accessed. The present invention relates to an image data access method that converts the addresses of a plurality of plane memories storing data so that it can be accessed line by line.

In recent years, display devices that have the function of displaying and editing multivalued data such as color data are configured with image memory consisting of multiple plane memories, and store image data in a bitmap format in which the image is developed on the memory using pixels as memory units. are doing.

When processing this image data using line correlation, or when transferring the data to an output device such as a printer, it is difficult to process it at high speed, and an appropriate access method is desired.

[Conventional technology]

In an image data memory composed of multiple planes, the data is usually composed of bits at the same position of the planes.

Therefore, when processing is performed line by line, data is read out line by line by accessing the corresponding line for each plane.

That is, it is necessary to access each plane in order to access one line data, and each time, the designation of the plane is changed and an instruction command is activated.

[Problem that the invention seeks to solve]

In this conventional method, in order to read one line of data, it is necessary to change the plane and start a command, so it is not possible to speed up the overall processing time.

The present invention has been created in view of the above points, and instead of having an image memory in a plain configuration, it is configured to have a memory unit of 1947 minutes of data.
The purpose is to provide a method that allows processing of one line of data with one command.

[Means for solving problems]

In order to achieve the above object, an address conversion circuit is provided to convert the address of a bitmap memory consisting of a plurality of plane memories storing multivalued data, so that the address can be accessed for each line number.

[For production]

The actual bitmap memory (image memory), in which each plane memory is made up of line data stored in line order, uses an address conversion circuit to process the data of the same line number of each plane line by line in the order of the plane number. The data group arranged in plane order is converted into a memory in which the data group is arranged in line number order.

〔Example〕

FIG. 1 is a diagram illustrating an embodiment of the image data access method of the present invention, and FIG. 2 is a block diagram showing the configuration of an address conversion circuit.

In FIG. 1(a), Ml indicates a data storage format of a normal memory.

M2 is the data storage format of the memory configured as a line, and when the memory with the storage format M1 is passed through the address conversion circuit l,
It has a storage format replaced by a memory with storage format M2.

i is the plane number, j is the line number, and i
−j (i, j=1 to n) indicates data of the j line of the i plane.

That is, in a memory of storage format M2, the data of the first line of the first plane of Ml is stored in the first line, the data of the first line of the second plane of Ml is stored in the second line, and the data of the first line of the second plane of Ml is stored in the first line. The data of the first line of the nth plane of Ml is stored.

Further, it is shown that the data of the second line of the first plane of Ml is sequentially stored in the n+lth line of M2.

For example, as shown in FIG. 1(b), the address A given as the address of the line-configured memory from the data processing bag 2 is converted into an actual image memory address by the address conversion circuit 1. The data stored at that address will be accessed.

That is, as shown in FIG.
A first divider 11 whose divisor is the product of the number of memory units q constituting the line, that is, the number of memory units of one plane memory.
The quotient indicates the selected plane number of the memory, and the remainder is connected to the second divider 12.

The second divider 12 divides the input remainder of the first divider 11 by the number q of memory units constituting one line.

The quotient 2 of the second divider 12 indicates the memory coordinate displacement Δy in the Y direction within the plane, and the remainder m indicates the displacement ΔX in the X direction within the plane.

That is, address A of M2 is A=k-p-q+l-q+m It is expressed as

On the other hand, the number p of planes of the image data memory M and the bit length q of one line are generally configured as a power of two.

Therefore, the divider can use means for shifting the digits of a code made up of binary numbers, which is commonly used in digital operations, as a division method, and can be easily constructed with registers capable of shifting digits.

〔Effect of the invention〕

As described above, according to the present invention, line-by-line transfer (for example, outputting color data to a printer) can be executed without transferring in brane-by-brane units, making high-speed processing possible. Editing (for example, compression processing of color data) can be easily performed, which is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating an embodiment of the image data access method of the present invention. FIG. 1 is a block diagram showing the configuration of an address translation circuit. In the figure, 1 is an address conversion circuit, 2 is a data processing device, 11.12 is a divider, Ml is a normal data storage format of memory, M2 is a data storage type blade (Q) after address conversion of memory, and mid The history of the empty 413 months and the solid relationship between the dates and the moon

Claims (2)

[Claims] (1) An address conversion circuit (1) is provided in a bitmap memory in which unit data constituting multivalued data is stored in memory units at the same location in each of a plurality of plane memories, and the same line number of the bitmap memory is provided. An image data access method characterized by converting the address of the data so that it can be accessed separately. (2) The address conversion circuit is a first divider (11) whose divisor is the number of memory units constituting one plane memory.
and a second divider (12) whose divisor is the number of memory units of the lines constituting the plane memory, the quotient of the first divider (11) is the number of the plane memory, and the first
The remainder of the divider (11) is output to the second divider (12), the quotient of the second divider (12) is set as the line number of the plain memory, and the remainder is set as the line number. 2. The image data access method according to claim 1, wherein the image data access method is an address conversion circuit that converts the unit memory number into the address conversion circuit.