JPH04319888A - Control method for image memory - Google Patents

Abstract

PURPOSE:To write and read out all data of 1035 lines of the number of scanning lines per frame of a high vision studio standard without increasing the capacity of an image memory. CONSTITUTION:By a memory of 512X512 units, a memory array of 2048X1024 capacity is constituted, and also, on both end parts of its memory array, areas 1a, 1b of 64X1024 capacity are provided, respectively, and in an area 1c of 1920X1024 capacity except both its end parts, data of a first line to a 1024th line of effective scanning lines per frame is stored successively, and in two areas 1a, 1b of 64X1024 capacity, data of a 1025th line to a 1035th line of effective scanning lines per frame is stored alternately and successively by 64 pieces each, and also, at the time of reading out those data, the data in the area 1c of its 1920X1024 capacity are transferred successively to a serial register 8 of an image memory 1, and the data of the area 1a, 1b of two 64X1024 capacity are transferred successively to its serial register 8.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an image memory used in a high-definition still image system, etc., and more specifically, the present invention relates to an image memory used in a high-definition still image system, etc. The present invention relates to a method of controlling an image memory to enable writing and reading.

0002

[Conventional example] Conventionally, this high-definition still image system
For example, as shown in FIG. 6, there is a memory array (not shown) that stores data such as still images, and an image memory 1 that transfers the data in the memory array to a serial register and outputs it.
and a parallel/serial converter 2 that converts the data (parallel) from the image memory 1 into serial data.
This converted serial data is converted into an analog signal (R, G,
B signal or Y, Pb, Pr signal) and converts the signal into a signal that can be input to a monitor device.

[0003] When a high-definition studio standard high-definition signal is digitized, its sampling frequency is 7.
With 4.25 MHz and 1035 effective scanning lines per frame, the number of data is 1920 horizontally x 1035 vertically. Note that the quantization number is omitted.

[0004] For this reason, as for the structure of the above-mentioned image memory, the current memory has a unit of 512 x 512, so if you try to store all the data, the 512
The memory of 2×512 units is 4 columns horizontally and 3 columns vertically, and 204
A memory array with a capacity of 8×1536 is required.

By the way, the 2048 x 1536 capacity leaves a lot of unused space, so in consideration of the high cost, the memory capacity is reduced to 2048 x 1024 capacity, as shown in Fig. 6, that is, in 512 x 512 units. The memory is arranged in four columns horizontally and two columns vertically, and of the 1035 effective scanning lines, 11 lines of data are reduced, and 1024 lines of data are written and read.

[0006]

However, in the above-mentioned image memory control method, one of the 1035 effective scanning lines per frame is controlled by the memory control signal.
024 lines of data are written in an area with a capacity of 1920 x 1024, but the 128 x 1024 line indicated by diagonal lines in Figure 6
The capacity area is not used, and as mentioned above, only 1024 lines of data out of 1035 scanning lines are written.In other words, all the data of 1035 effective scanning lines per frame according to the high-definition studio standard is stored. Therefore, there was a problem in that it was not possible to display with the number of scanning lines that complied with the Hibyung Studio standard.

The present invention has been made in view of the above-mentioned problems, and its purpose is to utilize the unused area of the memory to scan the remaining 11 lines of the effective number of scanning lines per frame without increasing the memory capacity. An object of the present invention is to provide a method for controlling an image memory that can store data and display a number of scanning lines in accordance with the high-definition studio standard.

[0008]

[Means for Solving the Problem] In order to achieve the above object, an image memory control method of the present invention provides a
A memory array with a capacity of 2048 x 1024 is configured by two units of memory, and an area with a capacity of 64 x 1024 is provided at each end of the memory array, and when writing data using 1035 effective scanning lines per frame, the above-mentioned method is used. Number of effective scanning lines per frame: 103
Of the 5 lines, the data of the 1st line to the 1024th line is written to an area of 1920 x 1024 capacity excluding the areas at both ends, and the data of the remaining 1025th line to 1035th line is written to the area at both ends. , respectively in each 64 x 165 capacity area, and when reading the data, the 1920 x 1024 capacity area is
The gist is that the data in the capacitance area is transferred to the serial register, and then the data in the 64×1024 capacitance area at both ends is transferred to the serial data and output.

Further, according to the image memory control method of the present invention, when writing the data of the 1025th line to 1035th line to the 64×1024 capacity area at both ends, the data of each line is divided into halves and divided into two halves. When data is stored in a 64 x 1024 capacity area at both ends of the area and read out, half of the data of each line is alternately transferred to the serial register from the 64 x 1024 capacity area at both ends. This is what I did.

0010

[Operation] Since the above method is used, when writing data of 1035 effective scanning lines per frame according to the high-definition studio standard to the image memory, the first line to the 1024th line
Line data (1920 x 1024 pieces) are sequentially written into an area of 1920 x 1024 capacity other than the areas at both ends, and 64 pieces of data are written into two 64 x 165 lines for each line from the 1025th line to the 1035th line. The data is written alternately to the capacitance area, and each data is written repeatedly 15 times.

[0011] When reading data from the image memory into which these data have been written, the above 1920 x 10
Data in an area of 24 capacities, that is, data in the first to 1024th effective scanning line per frame, is transferred to the serial register of the image memory, and then
Data from the 25th line to the 1035th line is transferred to the serial register.

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

In this way, by using the unused area of the memory array with a capacity of 2048 x 1024, it is possible to write all the data of the 1035 effective scanning lines per frame to the image memory and read out all the data. It is possible to display the number of scanning lines compliant with the high-definition studio standard.

[0014]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5. In the figure, the same parts and corresponding parts as in FIG. 6 are denoted by the same reference numerals, and redundant explanation will be omitted.

In FIGS. 1 and 2, the image memory 1 includes a memory array with a capacity of 2048×1024 as in the conventional case, and an area with a capacity of 64×1024 is provided at both ends of the memory array. Separately from the 1024 capacity area 1c, these 64 x 1024 capacity areas are provided with 64 x 165 capacity areas 1a and 1b, respectively. Note that the shaded area in the figure is an unused area.

[0016] In the area 1c of 1920×1024 capacity,
The first of 1035 effective scanning lines per frame
Line to 1024th line data (1920×10
24) are written. The 64×165 capacity areas 1a and 1b at both ends have the 1025th line to the 1035th line.
Line data (1920×11 pieces) is written.

[0017] In this case, the 1025th line to the 103rd line
Half of the data for each line of 5 lines (1920 x 5.5
1920 x 5.5 pieces) are written into the area 1a with a capacity of 64 x 165, and the remaining half (1920 x 5.5 pieces) are written into the area 1b with a capacity of 64 x 165. In addition, data for each line (19
20 pieces) are alternately written in each of the 4 x 165 capacity area 1a and the 64 x 15 capacity area 1b.

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

That is, as shown in FIG. 3, when reading data from the first to 1024th lines of effective scanning lines per frame, a control signal is used to switch the switching unit 7 to the full half transfer unit 4 side using an internal select signal. is obtained. In addition, as shown in FIGS. 4 and 5,
When reading data from the 1025th to 1035th scanning lines, a control signal for switching the switching unit 7 to the upper half transfer unit 5 or lower half transfer unit 6 side is obtained by an internal select signal.

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

For the data of the first to 1024th effective scanning lines per frame, the control signal from the full half transfer section 4 is used, and the 1025th line
For data from the line to the 1035th line, control signals from the upper half transfer section 5 and the lower half transfer section 6 are used alternately.

To explain in more detail, when reading data from the image memory 1, the switching section 7 switches between all half transfer sections 4 and 4.
out of the 1035 effective scanning lines per frame, the data from the 1st line to the 1024th line, that is, the data in the area 1c with a capacity of 1920 x 1024, is sequentially transferred to the serial register 8 (as indicated by the arrow in FIG. 3). ).

[0023] Next, the 1025th line to the 1035th line
Regarding line data transfer, the switching section 7 is switched to the upper half transfer section 5 or the lower half transfer section 6 side, and the control signal thereof is switched every 64 data transfers. In other words, 64 x 15 pieces of data written in area 1a with a capacity of 64 x 1024, 64
64×1 written in area 1b with ×1024 capacity
Five pieces of data are alternately and sequentially transferred to the same location on the output side of the serial register 8 every 64 pieces (as shown by arrows in FIGS. 4 and 5).

[0024] In this case, the 1025th line to the 103rd line
The operations shown in FIGS. 4 and 5 are repeated 15 times for each of the five 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 the data (19
20×1035 pieces) are sequentially transferred to the real register 8, so all the data for the effective number of scans is read out.
One frame display becomes possible on a monitor device or the like. Note that when the data written in the image memory 1 is high resolution image data, the above operation is actually repeated for each field because the interlaced method is used.

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

In this case, the 10th effective scanning line per frame
When reading data from the 25th line to 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. Just do it.

[0028]

As explained above, according to the image memory control method of the present invention, a memory array with a capacity of 2048 x 1024 is constructed using memories in units of 512 x 512, and each end portion of the memory array is 6
An area with a capacity of 4 x 1024 is provided, and of the 1035 effective scanning lines per frame, the data of the 1st line to the 1024th line is stored in an area (192
0x1024 capacity area) and the 10th
The data of the 25th line to the 1035th line is written in a 64 x 165 capacity area within the 64 x 1024 capacity area at both ends thereof, and when reading those data, the control signal of the image memory is switched, and the 1920 x 1024 capacity is changed. The data in the area is sequentially transferred to the serial register of the image memory 1, and then the data in the 64 x 165 capacity area at both ends of the area is alternately transferred to the serial register, so the capacity of image memory 1 is , it is possible to store all data with an effective scanning line count of 1035 lines per frame and read out all data without increasing the memory element (DRAM).For example, it is possible to display a display with a scanning line count that conforms to the high-definition studio standard at a low cost. can be realized.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a capacity area showing an embodiment of the present invention and explaining a method of controlling an image memory.

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 operational diagram of a system explaining the image memory control method of the present invention.

FIG. 4 is an operational diagram of a system illustrating the image memory control method of the present invention.

FIG. 5 is an operational diagram of a system illustrating the image memory control method of 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 192
0x1024 capacity area 4 All half transfer section 5 Upper half transfer section 6 Lower half transfer section 7 Switching section

Claims (2)

[Claims] [Claim 1] 2 units of memory with 512 x 512 units
A memory array with a capacity of 048 x 1024 is configured, and 64 x 102 memory cells are installed at both ends of the memory array.
4 capacity area and 103 effective scanning lines per frame.
When writing data using 5 lines, of the 1035 effective scanning lines per frame, the data of the 1st line to 1024th line is written to an area with a capacity of 1920 x 1024 excluding the areas at both ends, and the remaining The data of the 1025th line to the 1035th line of the 1025th line to the 1035th line are sequentially written to each 64 x 165 capacity area among the areas at both ends, and when reading the data, the data of the 1920 x 1024 capacity area is written to the serial register. Transfer and then 64× of both ends
1. A method for controlling an image memory, characterized in that data in an area having a capacity of 1024 is transferred to serial data and output. 2. When writing the data of the 1025th line to 1035th line to the 64×1024 capacity area at both ends, the data of each line is divided into halves and stored in these areas, and the 64×1024 capacity area at both ends is When reading data in a capacity area, 64 x 102 at both ends
Claim 1: Data in a four-capacity area is alternately transferred to the serial register, with half data of each line being alternately transferred.
The described method for controlling image memory.