JPH02107056A - Frame memory controller - Google Patents

Abstract

PURPOSE:To control the direction of picture data writing/reading by changing the added quantity of an address by means of an address generating means according to the instruction of the read/write directions. CONSTITUTION:A row address counter 24 and a line address counter 26 are connected to an address generator 22, a switch 28 is changed-over by a selective signal (H/V select signal) in the read/write direction sent from a control part 40, and a clock from a clock generator 30 is outputted to the row address counter 24 or the line address counter 26. A reset signal is inputted from the control part 40 to the address counters 24 and 26 as well, and the counting is reset by the signal. Thus, the writing and reading of the frame memory used for a serial memory can be controlled in the longitudinal and lateral directions of the picture, and the two-dimensional processing of picture data is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION The technical field of the invention relates to a control device for a frame memory, and the invention relates to a control device for a frame memory used as a serial memory for recording input image data and reading out compressed image data in the order in which they are input. Regarding equipment.

Serial memory is used as a memory for storing image data. Serial memory is a so-called FIF that reads input and stored data in the order in which it was input.
Because it performs O (First-In First-Out) operation and can read and write at high speed, it is widely used to store image data, and is often used as a frame memory that stores one screen worth of image data. ing.

By the way, when reading input and stored data from a frame memory used as such a serial memory, the data can only be read in the order in which it was input as described above. Therefore, there is no problem when reading the image data in the order of the scanning lines in the horizontal direction of the screen because it is in the order in which the data is input, but there is a problem that, for example, it is not possible to satisfy the request to read the image data in the vertical direction of the screen and perform processing. was there.

OBJECTS It is an object of the present invention to solve the problems of the prior art and to provide a frame memory control device that can control the writing and reading directions of image data.

DISCLOSURE OF THE INVENTION According to the present invention, a frame memory control device stores input image data in a frame memory and controls the stored image data to be read out in the order of the storage area of the frame memory. An input means for inputting an instruction for either the vertical or horizontal direction of one screen as a reading or writing direction, and a memory for generating addresses for reading or writing image data according to instructions manually entered by the input means. The address generating means changes the increment amount of the address in accordance with the instruction of the direction of reading and fortune-telling.

DESCRIPTION OF EMBODIMENTS Next, embodiments of a frame memory control device according to the present invention will be described in detail with reference to accompanying drawings.

FIG. 11 shows an embodiment of a frame memory control device according to the present invention.

Input from input terminal 12 is connected to manual buffer 14 . The input buffer 14 is a buffer that temporarily stores image data input from the input terminal 12 and reads it out at a predetermined speed. A control signal for controlling data input is sent to the manual buffer 14 from the control section 40 . The output from input buffer 14 is input to memory cell 1B.

The memory cell 16 is a frame memory that stores image data for one screen. As shown in FIG. 2, scanning lines 101, 102, 103 . ... are each composed of L pixel data, all the pixel data constituting these scanning lines are 1, usually 0, 1,
2. ..., L, L+1. L÷2. . . , pixel data is input for each scanning line in the horizontal direction of the screen and stored.

An address generator 22 is connected to the memory cell 18 . The address generator 22 is a memory cell 1
Addresses for writing image data into memory cell 6 and reading image data from memory cell 16 are generated and output to memory cell 16.

The address generator 22 has a row address counter 2.
4 and line at 1/counter 26 are connected. The row address counter 24 generates addresses in the column direction in FIG. That is, for example, pixel 0 in FIG. L
, 2L . . . , I, L+1, 2L+1 . Line address counter 26 generates addresses in the row direction in FIG. That is, pixels 0, 1,
2. ..., L, L+1. This is a counter that increments the address by 1 for reading in the row direction (horizontal direction) in the order of L◆2....

The row address counter 24 is connected to the address generator 2.
The line at 1/counter 26 generates the lower address of the address generator 22. The row address counter 24 and the line address counter 26 are connected to each other, and when the line address counter 26 counts one row, the row address counter 24 is incremented.

A clock signal is input to the row address counter 24 and the line address counter 26 from the output terminal of the switch 28. A clock from a clock generator 30 is input to an input terminal of the switch 28 .

The switch 28 is switched by a read/write direction selection signal (H/V select signal) sent from the control unit 40, and outputs the clock from the clock generator 30 to the row address counter 24 or line address counter 2B.

A reset signal is also input to the row address counter 24 and the line address counter 26 from the control section 40, thereby resetting the counts.

The output from memory cell 16 is input to an output buffer, 18. The output buffer 18 is a buffer that temporarily stores image data input from the memory cell 18 and reads it out at a predetermined speed. A control signal for controlling data output is sent from the control section 40 to the output buffer 1B. The output from output buffer 18 is output to output terminal 20.

The control section 40 is a control section that controls each section of the present device, and is advantageously configured by a microprocessor. Control unit 40
An operation input section 42 such as a keyboard is connected to which an operator inputs instructions.

Next, an example of the operation of this device will be explained.

The operator first inputs an address reset instruction from the operation input section 42. As a result, a reset signal is sent from the control section 40 to the row address counter 24 and line address counter 26, and these counters are reset. Further, in order to write data in the memory cell 1B in the horizontal direction, the operator inputs the manual power for instructing horizontal writing from the operating manual power i'1142.

Image data for one screen is sent from the input terminal 12 to pixels 0, 1, 2, 3, . . . in FIG. ...L-1, L, L+I, L◆
2. . . are input in this order, and after being temporarily stored in the manual buffer 14, they are sent to the memory cell 16. At this time, a selection signal (H select signal) for selecting the horizontal direction (horizontal) is output from the control section 40 to the switch 28, and the switch 28 is connected to the line address counter 26 opposite to that shown in the figure. Accordingly, the clock signal generated by clock generator 30 is passed through switch 28 to line address counter 26. Line address counter 2
8 is incremented by this, and outputs a signal that increments the address by 1 to the address generator 22.

The address generator 22 corresponds to pixels 0, 1, 2°3, . . . L-1, L, L+1, . . . in FIG. L+2. . . , and outputs them to the memory cell 18. According to this address, the memory cell 16 transfers the image data sent from the input buffer 14 to addresses 0, 1, 2, 3, . ...
L-1, L, L+1. L+2. ... are stored in the normal order.

When data for one screen has been stored, the operator then inputs an instruction to read image data in the vertical direction of the screen, for example, from the operation input section 42. As a result, a selection signal (V select signal) for selecting the longitudinal direction (vertical) is sent from the control unit 40.
is output to the switch 28, and the switch 28 takes the connection shown in the figure and is connected to the row address counter 24. Therefore, a clock signal generated from clock generator 30 is sent to row address counter 24 through switch 28. The row address counter 24 is incremented by this, and outputs a signal that increases the address by L to the address generator 22.

Address generator 22 operates at pixel 0.0 in FIG. L.

Addresses are generated in the vertical direction in the order of 2L..., l, 1, +1, 2L+1... and output to the memory cell 16. According to this address, the memory cell 16 transfers the stored image data to the above pixel 0. L, 2L..., 1. L+1
．． Read out in the vertical direction in the order of 2L+1...

The read image data is temporarily stored in the output buffer 18 and then output to the output terminal 20.

According to the apparatus of this embodiment, as described above, image data input in the horizontal direction of the screen can be stored for each scanning line, and can be read out in the vertical direction of the screen. Frame memories used as conventional serial memories can only read out image data in the order in which they are input. Therefore, when data is written in the horizontal direction of the screen as in the case of L, the data must be read in the horizontal direction of the screen, and cannot be read in the vertical direction. On the other hand, according to this embodiment, even if the image is written in the horizontal direction of the screen, it can be read out in the vertical direction of the screen. Therefore, 2
Image data arranged in dimensions can be easily converted into vertical and horizontal display.

In the above embodiment, image data is written in the memory cells 16 in the horizontal direction of the screen and read out from the memory cells 16 in the vertical direction, but it is also possible to write in the vertical direction and read out in the horizontal direction. good.

Furthermore, by setting the increment of the address generated from the row address counter 24 to, for example, every n pixel data instead of L, interleaved (thinned) image data can be read out.

Effects According to the present invention, reading and writing of a frame memory used as a serial memory can be controlled in the vertical and horizontal directions of one screen, thereby facilitating two-dimensional processing of image data.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a frame memory control device according to the present invention, and FIG. i2 is a diagram showing a pixel arrangement of image data processed by the device of FIG. 1. 1B. 22゜24゜26゜28゜30゜Explanation of symbols of main parts Memory cell address generator Row address counter Line address counter Switch Clock generator

Claims (1)

[Scope of Claims] 1. In a frame memory control device that stores input image data in a frame memory and controls the stored image data to be read out in the order of storage areas of the frame memory, the device an input means for inputting an instruction for either the vertical or horizontal direction of the screen as the reading or writing direction of the image data; and address generation means for generating an address for the frame memory and outputting it to the memory, the address generation means changing an increment amount of the address according to an instruction of the read and write direction. Control device. 2. The apparatus according to claim 1, wherein the address generating means is a first address generating means that advances when the read direction is the horizontal direction.
a second counter that increases the count according to the number of pixel data constituting one scanning line when the reading direction is vertical; and one of the first counter and the second counter. 1. A control device for a frame memory, comprising a selection means for making a selection.