JPH06295335A - Picture data storage device - Google Patents

Abstract

PURPOSE:To obtain a picture vertically inverted or rotated by 90 deg. without changing image plotting software by connecting an address converting means to an address bus for a picture memory in a picture data storage device for storing a picture image in the picture memory. CONSTITUTION:A picture vertically inverted or rotated by 90 deg. can be obtained by dividing addresses for picture data in the picture memory 11 into addresses corresponding to the rows and columns of picture elements in a picture image by the address converting means 12 and combining respective operation for the row addresses and column addresses and exchange between row and column addresses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data storage device.

[0002]

2. Description of the Related Art In recent years, image data storage devices have been used for displaying and processing image images.

An example of the above-mentioned conventional image storage device will be described below with reference to the drawings. FIG. 3 is a configuration diagram when a display device for image data is configured using a conventional image data storage device. In FIG. 3, reference numeral 31 is an image memory that holds image data. 32 is an image memory 31
An image display device for displaying the image data stored in.

FIG. 4 shows what kind of address is assigned to a pixel displayed on the image display device 32 when an image image is recorded in the image memory 31, and 1 byte of data is 1 of image data. Corresponds to the pixel. In the conventional image storage device, the direction in which the address increases is fixed in the column direction, and the upper left corner of the image is 0, and the address of a given pixel is 1 in the address of the pixel next to the left.
The address of the leftmost pixel is the address obtained by adding 1 to the address of the rightmost pixel on one row.

The function of the image data storage device configured as described above will be described. Image memory 31
When 1 byte of data is written to a certain address,
The data was written in the position of the image image indicated by (X coordinate) = (address of memory) mod (number of pixels in X direction) (Y coordinate) = (address of memory) / (number of pixels in X direction) Preserved as color points corresponding to the data. Further, a pixel in the image can be accessed by an address represented by (address) = (X coordinate) + (Y coordinate) × (number of pixels in X direction).

[0006]

However, in the above configuration, when an image in which the image data is vertically inverted or rotated by 90 degrees is drawn, the address conversion must be performed for each pixel, There is a problem in that when the image is handled by the computer, the load on the software becomes large.

In view of the above problems, it is an object of the present invention to provide a mechanism capable of changing the orientation of an image on the image memory by converting an address to the image memory.

[0008]

In order to solve the above problems, an image data storage device of the present invention has a function of dividing an address signal for image data into a row address and a column address of the image data, and the column address. It is provided with an address converting means having a function of exchanging row addresses and a function of performing an operation on the row addresses and the column addresses.

[0009]

According to the present invention, the address to the image memory is divided into the column address and the row address by the above-mentioned structure, and the row address is operated to invert the address vertically, and the column address is operated to invert the left and right. By exchanging the address, the row address and the column address, it is possible to obtain the address which is turned upside down on the diagonal line from the point at the upper left corner. By combining these, it is possible to obtain an image in any orientation.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An image data storage device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an image data display device using an image data storage device according to an embodiment of the present invention. In FIG. 1, 11 is 5
The image memory holds image data of 12 dots × 512 dots. Reference numeral 12 is an address conversion means for converting an address into image data. Reference numeral 13 is an image data display device for displaying an image in the image memory 12. FIG. 2 is a block diagram of the address conversion means 12. Reference numeral 2a is an inverter for performing an operation of (number of dots in row direction)-(row address) on the row address. Reference numeral 2b is an inverter for performing an operation of (number of dots in the column direction)-(column address) on the column address. Reference numerals 2c and 2d denote selectors for selecting whether the row address and the column address are calculated or not.
Reference numerals 2e and 2f are selectors for selecting whether to exchange the row address and the column address. 2g, 2h, 2i are control inputs for determining the output of each selector. The image data storage device configured as described above will be described with reference to the drawings.

First, FIG. 4 shows an address assigned to each pixel of an image image when no conversion is performed by the address conversion means, which is the same as the conventional image data storage device. In this state, if the image data is written in the image memory, the same image image as the conventional one can be obtained. When the selector 2c for selecting whether or not to perform the operation on the row address is switched by the control input 2g to perform the operation on the row address, the upside down address is allocated, and in this state, the image is stored in the image memory. When you write the data, you can get an image that is upside down.

Similarly, the selector 2d for selecting whether or not to perform the operation on the column address is set to the control input 2
If switched by h, the left and right upside down images can be obtained.

When the column address and the row address are exchanged by switching the selectors 2e and 2f for selecting whether to exchange the row address and the column address by the control input 2i, the diagonal line from the point at the upper left corner is turned upside down. Addresses are assigned, and when image data is written to the image memory in this state, an image image is obtained by turning over the diagonal line from the point at the upper left corner.

When these are combined to perform an operation on, for example, a column address to exchange a row address and a column address, an address rotated 90 degrees to the right as shown in FIG. 5 is assigned. When the image data is written in the image memory at, an image image rotated 90 degrees to the right is obtained.

[0015]

As described above, according to the present invention, even when an image image with a different orientation is drawn, it is not necessary to change the drawing program itself by merely operating the address conversion means, and it is practical. The effect is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram when a display device for displaying image data is combined with an image data storage device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram for explaining the operation of the address conversion means of the image data storage device in the embodiment of the present invention.

FIG. 3 is a configuration diagram when a display device for displaying image data is combined with a conventional image data storage device.

FIG. 4 is a diagram showing how an address is assigned to each pixel when an image image is recorded in an image memory.

FIG. 5 is a diagram showing how an address is assigned to each pixel when an image is recorded in the image memory 11 after the address conversion shown in the embodiment is performed.

[Explanation of symbols]

 11 image memory 12 address conversion means 13 image display device 31 image memory 32 image display device

Claims (1)

[Claims] 1. A memory for holding image data, a function for dividing an address signal to the image data into a row address and a column address of the image data, a function for exchanging the column address and the row address, and the row address. An image data storage device comprising an address conversion unit having a function of performing an operation on a column address.