JPH0817487B2 - Image memory control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image memory used in a high-definition still image system or the like, and more particularly to a high-definition studio standard with all data of 1035 scanning lines per frame without increasing the memory capacity. The present invention relates to a method of controlling an image memory that enables writing and reading.

[0002]

[Prior art example] Conventionally, this high-definition still image system
For example, as shown in FIG. 6, a memory array (not shown) that stores data such as a still image, and an image memory 1 that transfers and outputs the data in the memory array to a serial register.
And a parallel / serial conversion unit 2 for converting the data (parallel) from the image memory 1 into serial data,
The converted serial data is converted into analog signals (R, G,
B signal or Y, Pb, Pr signal), and a D / A converter 3 for converting the signal into a signal that can be input to the monitor device.

When a high-definition studio standard high-definition signal is digitized, its sampling frequency 7
With 4.25 MHz and 1035 effective scanning lines per frame, the number of data is 1920 × 1035. The quantization number is omitted.

For this reason, the image memory has a current memory of 512 × 512 units.
2 × 512 units of memory are arranged in 4 rows horizontally and 3 columns vertically,
It requires a memory array of 8 × 1536 capacity.

By the way, since a large amount of unused area is generated in the 2048 × 1536 capacity, in consideration of the high cost, as shown in FIG. 6, the 2048 × 1024 capacity and the memory capacity are reduced, that is, 512 × 512 units. The memory has four rows and two columns, and the data for 11 lines is reduced among the 1035 effective scanning lines, and 1024 lines of data are written and read.

[0006]

However, in the above-described image memory control method, one of the 1035 effective scanning lines per frame is controlled by the memory control signal.
Data of 024 lines is written in the area of 1920 × 1024 capacity, but 128 × 1024 shown by the diagonal lines in FIG.
The capacity area is not used, and moreover, as described above, only 1024 lines of data out of 1035 scanning lines are written, that is, all data of 1035 effective scanning lines per frame of the HDTV studio standard are stored. However, there is a problem that the display cannot be performed by the number of scanning lines conforming to the Hi-Byung Studio standard.

The present invention has been made in view of the above problems, and an object thereof is to utilize the unused area of the memory without increasing the memory capacity and to use the remaining 11 effective scanning lines per frame. An object of the present invention is to provide a control method of an image memory capable of storing data and displaying by the number of scanning lines conforming to the high definition studio standard.

[0008]

In order to achieve the above object, the image memory control method of the present invention is 512 × 51.
A memory array having a capacity of 2048 × 1024 is configured by two units of memory, and regions having a capacity of 64 × 1024 are provided at both ends of the memory array. When writing data with 1035 effective scanning lines per frame, 103 effective scan lines per frame
Of the five lines, the data of the first line to the 1024th line is written in the region of 1920 × 1024 capacity excluding the regions of the both ends thereof, and the remaining data of the 1025th line to the 1035th line is written in the region of the both ends. , Sequentially writing to each 64 × 165 capacity area, and reading the data, the above 1920 × 1024
The gist is that the data in the capacity area is transferred to the serial register, and then the data in the area of 64 × 1024 capacity at both ends is transferred to the serial data and output.

Further, according to the image memory control method of the present invention, when the data of the 1025 to 1035 lines is written in the 64 × 1024 capacity area at the both ends, the data of each line is divided into halves. When storing the data in the area and reading the data of the area of 64 × 1024 capacity at both ends thereof, the data of the area of 64 × 1024 capacity at the both ends thereof is transferred to the serial register alternately by half the data of each line. It is the one.

[0010]

With the above method, when writing data of 1035 effective scanning lines per frame of the HDTV studio standard into the image memory, the first to 1024th lines are written.
The line data (1920 × 1024) is sequentially written in the region of 1920 × 1024 capacity other than the above-mentioned both end regions, and 64 data for each line of the 1025th to 1035th lines are two 64 × 165. It is written alternately in the region of the capacity, and is repeatedly written 15 times.

When reading the data from the image memory in which the data is written, the above-mentioned 1920 × 10
The data of the area of 24 capacities, that is, the data of the first to 1024th effective scanning lines per frame is transferred to the serial register of the image memory, and then the 10th line.
Data of lines 25 to 1035 are transferred to the serial register.

Regarding the data of the 1025th to 1035th lines, 64 pieces of data are alternately transferred from the above two areas of 64 × 165 capacity to the serial register, but the data of one area (64 pieces) is transferred. ), The data (64 pieces) already transferred to the serial register is output, that is, the data is read.

As described above, by utilizing the unused area of the memory array having the capacity of 2048 × 1024, it is possible to write all the data of the effective scanning lines of 1035 lines into the image memory and read the all data. It is possible to display the number of scanning lines conforming to the high definition studio standard.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same parts as those in FIG. 6 and the corresponding parts are designated by the same reference numerals, and a duplicate description will be omitted.

In FIGS. 1 and 2, the image memory 1
Is equipped with a memory array of 2048 × 1024 capacity as in the conventional case, and regions of 64 × 1024 capacity are provided at both ends of the memory array. The area of 1 × c of other 1920 × 1024 capacity is divided into those 64 × 1024 capacity. Areas 1a and 1b each having a capacity of 64 × 165 are provided in the area. The shaded area in the figure is an unused area.

In the area 1c of 1920 × 1024 capacity,
First of 1035 effective scanning lines per frame
Line to 1024th line data (1920 × 10
24) are written. Lines 1025 to 1035 are provided in the regions 1a and 1b having the capacity of 64 × 165 at both ends thereof.
The line data (1920 × 11) is written.

In this case, lines 1025 to 103
Half the data of each of the 5 lines (1920 x 5.5
(Number of pieces) is written in the area 1a having a capacity of 64 × 165, and the other half (1920 × 5.5 pieces) is written in the area 1b having a capacity of 64 × 165. In addition, data for each line (19
(20 pieces) are written alternately in 64 * 15 capacities of the area 1a and the area 1b of 4 * 165 capacity, 64 pieces each.

Data reading from the image memory 1 is performed according to a memory control signal.
As shown in FIGS. 3 to 5, the memory control signal is the data transfer corresponding to the 1st to 1024th lines of the number of effective scanning lines per frame.
The transfer is different for the data corresponding to the line to the 1035th line.

That is, as shown in FIG. 3, at the time of reading the data of the effective scanning lines 1st to 1024th lines per frame, a control signal for switching the switching unit 7 to the half transfer unit 4 side by an internal select signal. Is obtained. In addition, as shown in FIG. 4 and FIG.
When reading the data of the scanning lines 1025 to 1035, a control signal for switching the switching unit 7 to the upper half transfer unit 5 or the lower half transfer unit 6 side is obtained by an internal select signal.

The full half transfer section 4 outputs a control signal for data transfer in the area 1c of 1920 × 1024 capacity, and the upper half transfer section 5 outputs a control signal for data transfer in the area 1a of 64 × 1024 capacity. The lower half transfer unit 5 outputs the area 1 of 64 × 1024 capacity.
It outputs a control signal for data transfer of b.

For the data of the effective scanning line 1st line to 1024th line per frame, the control signal from all the half transfer units 4 is used.
The control signals from the upper half transfer unit 5 and the lower half transfer unit 6 are alternately used for the data from the line to the 1035th line.

More specifically, when the data is read from the image memory 1, the switching unit 7 operates the half-transfer unit 4.
Of the effective scanning lines 1035 lines per frame, the data from the first line to the 1024th line, that is, the data of the region 1c of 1920 × 1024 capacity is sequentially transferred to the serial register 8 (arrow in FIG. 3). Shown in).

Subsequently, lines 1025 to 1035
Regarding line data transfer, the switching unit 7 is switched to the upper half transfer unit 5 side or the lower half transfer unit 6 side, and the control signal is switched every 64 data transfers. That is, 64 × 15 pieces of data written in the area 1a having a capacity of 64 × 1024, 64
64 × 1 written in area 1b of × 1024 capacity
Five pieces of data are sequentially transferred every 64 pieces to the same place on the output side of the serial register 8 (shown by arrows in FIGS. 4 and 5).

In this case, lines 1025 to 103
The operations shown in FIGS. 4 and 5 are repeated 15 times for each of the 5 lines, and while the data in one area 1b is being read, the data in the other area 1a is transferred to the serial register 8.

In this way, the serial register 8 stores all data (19
(20 × 1035) are sequentially transferred to the real register 8, so that all the data of the effective scanning number is read out,
One frame can be displayed on a monitor device or the like. If the data written in the image memory 1 is high-jon image data, since the interlace method is used, the above operation is actually repeated for each field.

Data (1920) of one effective scanning line per frame may be sequentially written in the two areas 1a and 1b of 64 × 165 capacity. That is, for the 1025th to 1035th lines, the data of the 1025th to 1029th lines and the half data of the 1030th line are 64
Data is written in the area 1a having a capacity of × 165, and the remaining half of the 1030th data and the 1031rd to 1035th lines are written.
The line data is written in the area 1b of 64 × 165 capacity.

In this case, the effective scanning line No. 10 per frame
When reading data from the 25th line to the half of the 1030th line, the switching unit 7 is switched to the upper half transfer unit 5 side, and when reading data thereafter, the switching unit 7 is switched to the lower half transfer unit 6 side. You can do this.

[0028]

As described above, according to the image memory control method of the present invention, a memory array of 2048 × 1024 capacity is constructed by 512 × 512 units of memory, and both ends of the memory array are respectively formed. 6
An area having a capacity of 4 × 1024 is provided, and the data of the first to 1024th lines of the effective scanning line 1035 lines per frame is excluded from the area at both ends thereof (192
0x1024 capacity area)
The data of 25th to 1035th lines are respectively written in the area of 64 × 165 capacity within the area of 64 × 1024 capacity at both ends thereof, and when reading the data, the control signal of the image memory is switched to the 1920 × 1024 capacity. The data of the area of 1 is sequentially transferred to the serial register of the image memory, and subsequently the data of the area of 64 × 165 capacity at both ends thereof is alternately transferred to the serial register. , All the data of 1035 effective scanning lines per frame can be stored without increasing the number of memory devices (DRAM), and all the data can be read out, for example, the display by the number of scanning lines conforming to the HDTV studio standard is inexpensive. Can be realized.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a capacity region for explaining an image memory control method according to an embodiment of the present invention.

FIG. 2 is a schematic partial block diagram of a system used in the image memory control method of the present invention.

FIG. 3 is an operation diagram of a system for explaining an image memory control method according to the present invention.

FIG. 4 is an operation diagram of a system for explaining an image memory control method according to the present invention.

FIG. 5 is an operation diagram of a system for explaining a control method of an image memory according to the present invention.

FIG. 6 is a partial schematic block diagram of a system used in a conventional image memory control method.

[Explanation of symbols]

 1 image memory 1a, 1b 64 × 165 capacity area 1c 1920 × 1024 capacity area 4 full half transfer section 5 upper half transfer section 6 lower half transfer section 7 switching section 8 serial register (of image memory 1)

Claims (2)

[Claims] 1. 20 by 512 × 512 unit memory
A memory array having a capacity of 48 × 1024 is constructed, and 64 × 102 is provided at each end of the memory array.
The area of 4 capacitors is provided and the number of effective scanning lines per frame is 103
When writing data by 5 lines, of the 1035 effective scanning lines per frame, the data of the 1st to 1024th lines are written in the region of 1920 × 1024 capacity excluding the regions at both ends thereof, and the remaining The 1025th to 1035th lines of data are sequentially written to the respective 64 × 165 capacity areas of the both end areas, and when reading the data, the data of the 1920 × 1024 capacity area is written to the serial register. Transfer and then 64 x at both ends
A method for controlling an image memory, characterized in that data in an area of 1024 capacity is transferred to the serial data and output. 2. When writing the data of the 1025 to 1035 lines into the 64 × 1024 capacity area at the both ends, the data of each line is divided into half and stored in the areas, and the 64 × 1024 at both ends thereof. When reading the data in the capacity area, 64 x 1024 at both ends
2. The method of controlling an image memory according to claim 1, wherein half the data of each line is alternately transferred to the serial register.