JPH05227479A - Multi-screen forming device - Google Patents

Abstract

PURPOSE:To take out picture signals without deteriorating the resolution of each picture signal by storing plural picture signals to be displayed on one picture, wherein storing the signals in a memory synchronously with a first clock, and reading out these signals synchronously with a second clock faster than the first clock. CONSTITUTION:A luminance signal including a horizontal synchronizing signal is stored in a Y memory 51 synchronously with the first clock based on a system control circuit 10, and besides, color difference signals R-Y,B-Y are A/D- converted 48 and stored in the memory 52. Then, these luminance signal and color difference signals R-Y,B-Y are read out by the second reference clock faster than the first clock generated from a synchronizing signal generation circuit 53. Then, the color difference signals R-Y, B-Y are read alternately out of the memory 52, but the color difference signals of the same horizontal scanning line are memory-controlled 46, and are outputted simultaneously from a coincidence circuit 57, and are D/A-converted 55,56. Then, the luminance signal and the color difference signals R-Y, B-Y are blanking-sync-mixed 61 to 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen forming apparatus for simultaneously displaying a plurality of different kinds of images on one screen.

[0002]

2. Description of the Related Art Conventionally, as a multi-screen forming apparatus, one described in, for example, Japanese Patent Application Laid-Open No. 2-82767 is known. This device reads out a plurality of image signals stored in a memory as a plurality of multi-screen display signals arranged in a predetermined order, and supplies these multi-screen display signals to the display device in units of one screen. It is configured.

[0003]

However, since such a conventional multi-screen forming apparatus displays a plurality of image signals originally displayed on one screen on one screen, the pixels of each image are thinned out. Therefore, it is impossible to display all the information amount of one image signal on one screen. Therefore, the conventional multi-screen forming apparatus has a problem that the resolution of each image is lowered and a clear image cannot be obtained. An object of the present invention is to provide a multi-screen forming apparatus capable of displaying a plurality of images on one screen without reducing the resolution of each image.

[0004]

A multi-screen forming apparatus according to the present invention comprises an image signal storage means for storing a plurality of sets of image signals in a memory in synchronization with a first clock, and the plurality of sets of image signals. To the second clock faster than the first clock
In addition to reading from the memory in synchronism with the clock, a high-definition display device is provided with an image signal reading means for outputting the image to be displayed on one screen.

[0005]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram of a reproduction system of a still video device to which an embodiment of the present invention is applied.

The system control circuit 10 is a microcomputer and controls the entire still video apparatus. The disk device has a magnetic head 11 and a spindle motor 12 for rotationally driving the magnetic disk D. The magnetic head 11 is tracking-controlled by the system control circuit 10 and is displaced along the radial direction of the magnetic disk D. The spindle motor 12 is drive-controlled by the system control circuit 10 and rotates the magnetic disk D at a rotation speed of 3600 rpm, for example. While the magnetic disk D is rotating, the magnetic head 1
1 is located on a predetermined track of the magnetic disk D and reproduces an image signal and an ID code on this track. In addition,
The magnetic disk D has 52 tracks, and signals such as image signals are recorded on 50 tracks counting from the outermost track to the inner track.

An operating section 14 connected to the system control circuit 10 is provided for operating the present still video apparatus. The operation unit 14 has, for example, a multi-image display button that is operated when performing so-called multi-image display in which a plurality of images of different types are simultaneously displayed on one screen.

The reproduction amplifier 41 reads the image signal and the ID code recorded on the magnetic disk D, and the Y reproduction processing circuit 42, the C reproduction processing circuit 43, and the ID reproduction processing circuit 4 are read.
Output to 4. The Y reproduction processing circuit 42 FM demodulates and outputs the luminance signal (Y + S) including the horizontal synchronizing signal. The C reproduction processing circuit 43 outputs the color difference signals (R-Y, B-Y) to the FM.
Demodulate and output. The ID reproduction processing circuit 44 demodulates the ID code into DPSK and outputs it.

The horizontal synchronizing signal S included in the luminance signal (Y + S) is supplied to the luminance signal (Y + S) by the synchronizing signal separation circuit 45.
S) and is sent to the memory control circuit 46 and the system control circuit 10. The memory control circuit 46, based on the horizontal synchronizing signal S, AD
It controls the converters 47, 48, Y memory 51 and C memory 52. Further, the memory control circuit 46, based on a sync signal from a sync signal generation circuit 53 described later,
It controls the A converters 54, 55, 56, the Y memory 51 and the C memory 52.

Luminance signal (Y + S) including horizontal sync signal
Is AD-converted by the AD converter 47, and the luminance signal Y recorded between the two horizontal synchronizing signals is stored in the Y memory 51 under the control of the memory control circuit 46.
The luminance signal Y stored in the Y memory 51 is DA-converted by the DA converter 54 based on the synchronization signal (reading reference clock signal) output from the synchronization signal generation circuit 53. Similarly, the color difference signals (RY, BY) are AD-converted by the AD converter 48 and stored in the C memory 52. The color difference signals (RY, BY) are alternately output from the C memory 52 based on the reference clock signal, but the color difference signals (RY, BY) of the same horizontal scanning line are controlled by the memory control. Due to the action of the circuit 46, the signals are simultaneously output from the synchronization circuit 57 and input to the DA converters 55 and 56, respectively, and DA converted.

The read reference clock signal is the memory 5
It has, for example, four times the frequency of the reference clock signal used for recording the image signal at 1, 52. Therefore, the image signal is read out from each of the memories 51 and 52 at a relatively high speed, whereby the time axis compression is performed.

Blanking sync mix circuits 61, 6
Reference numerals 2 and 63 are provided for defining a predetermined portion in front of each of the luminance signals (Y + S) and the two color difference signals (RY, BY) as a signal of 0 level and for superimposing the synchronization signal. This blanking sync mix circuit 61, 6
2, 63, a clean sync signal conforming to each system such as HDTV is added before these signals. The signals (Y + S), (RY), and (BY) from the blanking sync mix circuits 61, 62, and 63 are, for example, television signals according to the HDTV system (for example, high-definition television system), It is output to a high-definition display device. Note that, for convenience, the signal generated in this embodiment has a bandwidth four times that of a television signal generated by a typical still video playback apparatus, and the display apparatus also has a resolution four times the normal resolution. It is explained as a thing.

On the other hand, I stored in the magnetic disk D
The D code is subjected to processing such as DPSK demodulation in the ID reproduction processing circuit 44 and decoded by the system control circuit 10.

FIG. 2 shows a Y memory 26 and an RY memory 27.
And an example of the recording mode of the image signal in the BY memory 28 is schematically shown in association with an actual reproduction screen. In the figure, the number of scanning lines and the position where the scanning lines start on the screen are not accurate. Now, FIG. 2 shows the magnetic disk D.
Image signals for four screens recorded in the frame recording mode on the Y memory 26, the RY memory 27 and the BY memory.
The case where each is stored in the memory 28 is shown. Ie 1
The screen is composed of a first field and a second field. In the figure, the scanning line indicated by the solid line indicates the first field, and the broken scanning line indicates the second field. 1
One screen A is divided into four by a center line E extending in the vertical direction and a center line F extending in the horizontal direction, and one screen includes four images, that is, first to fourth images.

The memories 26, 27 and 28 have first to eighth areas, and each field stores one field of one image. That is, the image signal corresponding to the first field of the first image is stored in the first area of the memory. The image signal corresponding to the second field of the first image is stored in the second area of the memory. Similarly, the image signal corresponding to the first field of the second image is stored in the third area of the memory, and the image signal corresponding to the second field is stored in the fourth area of the memory. The image signal corresponding to the first field of the third image is stored in the fifth area of the memory, and the image signal corresponding to the second field is stored in the sixth area of the memory. The image signal corresponding to the first field of the fourth image is stored in the seventh area of the memory, and the image signal corresponding to the second field is stored in the eighth area of the memory. The image signals stored in the first to eighth areas are recorded on the first to eighth tracks of the magnetic disk D, respectively.

FIG. 3 shows the relationship between the image signals stored in the magnetic disk D and the image signals stored in the memories 26, 27 and 28. The relationship between these image signals will be described with reference to this figure and FIG.

The image signal K1 of the first field of the first image is recorded on the first track of the magnetic disk, and the image signal K2 of the first field of the third image is recorded on the fifth track. Each of these image signals is stored in the memory. The image signal G1 corresponding to the image signal K1 and the image signal G2 corresponding to the image signal K2 are continuously stored at addresses on the memory, and by sequentially reading the data from the left side to the right side in FIG. These image signals G1 and G2 form one scanning line. (The same applies to the second field.)
Further, the image signals G1 and G2 on the memory are time-axis compressed four times as much as the image signals K1 and K2 on the magnetic disk. That is, when the band of the image signal on the magnetic disk is f _H / 4, the band of the image signal on the memory is f _H / 4.
_H.

The image signals on the memories 26, 27 and 28 are
It is read for each horizontal scanning line. That is, the image signal is read for each horizontal scanning line in the order of the first area, the fifth area, the third area, and the seventh area, the first field is first reproduced, and then the second area, the sixth area, The fourth area and the eighth area are read in this order, and the second field is reproduced.

FIG. 4 shows the blanking sync mix circuit 6
It shows the effects of 1, 62, and 63. Memory 26,
The image signals L read out from 27 and 28 are added with the pulse signal (horizontal synchronizing signal S) output from the synchronizing signal generating circuit 53 by the adder 71 of the blanking sync mix circuits 61, 62 and 63. As a result, an image signal conforming to the high-definition television system is obtained and output to a high-definition display device.

FIG. 5 shows a flow chart of a program for reproducing a frame-recorded image and displaying it on a multi-screen. This program is started by pressing the multi-image display button of the operation unit 14.

The image signals are AD converted to the memories 26 and 2.
In order to store in the image signals 7 and 28, the input image signal must be sampled at a frequency that is at least twice the band of the image signal. Therefore, in step 101, the memory clock is set to a frequency f _SL that is at least twice the band of the image signal recorded on the magnetic disk. This memory clock is generated based on the reference clock signal output from the synchronization signal generation circuit 45. In step 102, the counter N
Is initially set to "1".

Next, at step 103, the ID data is decrypted. As a result, it is recognized whether the image signal of the track of the magnetic disk currently being reproduced is recorded in the frame recording mode or the field recording mode. In the case of frame recording, a pair of tracks is recognized. ..

In step 104, the recording mode is determined based on the ID data. When the recording mode of the currently reproduced track is the field recording, it is determined in step 105 whether this track is the 50th track, that is, the innermost track. In the case of the 50th track, step 121 described later is executed, but otherwise, the magnetic head is moved to the inner circumference side by one track in step 106, and steps 103 and 104 are executed again. When it is determined in step 104 that the recording mode of the currently reproduced track is frame recording, steps 111 to 117 are executed and the image signals are stored in the memories 26, 27 and 28.

In step 111, it is judged whether or not the currently reproduced track is the outermost track among the pair of tracks. As is well known, in frame recording, one image is recorded on two tracks adjacent to each other, the first field is stored on the outer track, and the second field is stored on the inner track. Then, on the inner track, the numbers of the outer tracks forming a pair are recorded. When it is determined in step 111 that the currently reproduced track is the outer track, step 113 is executed to write the first field in the memory. On the other hand, if it is determined in step 111 that the currently reproduced track is the inner track, the magnetic head is moved one track to the outer track in step 112, and then step 113 is executed.

In step 113, the image signal is written in the Nth area of the memory (the first area when this step is executed for the first time). That is, for example, the first of the first image
The field is written to the first area of memory. Then, in step 114, the magnetic head is moved to the inner circumference by one track, and in step 115, the image signal is
It is written in the (N + 1) th area of the memory. In this example, the second field of the first image is written to the second area of memory. As described above, the image signals of the two tracks forming a pair are stored in the memory.

After the counter N is incremented by "2" in step 116, it is determined in step 117 whether the counter N has exceeded "7". When the counter N exceeds "7", the image signals have been stored in the first to eighth areas of the memory, and thus step 1
21 and subsequent steps are executed and the image is reproduced as described later. However, when the counter N is "7" or lower, steps 104 and subsequent steps are executed again. Such actions are repeated, and the image signals of the first to fourth images are transferred to the first to eighth images of the memory.
It is stored in the area.

In step 121, the memory clock is
It is set to a frequency f _SH that is four times the frequency f _SL set in step 101. In step 122, the image signal stored in each area of the memory is reproduced by this high-speed clock. That is, one horizontal scanning line in the first area is reproduced, then one horizontal scanning line in the fifth area is reproduced, and this is repeated to reproduce the image signals in the first and fifth areas. To be done. Similarly, the image signals of the third and seventh areas are reproduced. As a result, the first fields of the four images are reproduced. Similarly, the second,
The image signals of areas 6, 4, and 8 are reproduced, and the second fields of the four images are reproduced.

In this way, one screen is reproduced, and four different images are displayed on this screen. The four images are
Pixels are not thinned out because they are stored in the memory at f _SL . And this image shows steps 121 and 122.
By the action of, 1/4 of the image scanning time in normal reproduction
Since it is reproduced by time-axis compression and displayed on a high-definition display device, the resolution of this image is the same as the original image. Therefore, according to this embodiment, an image as clear as the original image can be obtained.

FIG. 6 shows a flow chart of a program for reproducing a field-recorded image and displaying it on a multi-screen. That is, the first, third, fifth and seventh of the memory
Four image signals are stored in each area, and this program is also started by pressing the multi-image display button of the operation unit 14 similarly to the program of FIG.

In step 201, as in step 101, the memory clock is set to a frequency f _SL that is more than twice the band of the image signal recorded on the magnetic disk. In step 202, the counter N is initialized to "1". To be done. In step 203, the image signal is the (2N-1) th memory
Area (first area when this step is executed for the first time)
Written in. That is, for example, the first image is written in the first area of the memory. Then in step 204,
The counter N is incremented by "1". Step two
In 05, it is judged whether or not the currently reproduced track is the 50th track, that is, the innermost track. Fifth
In the case of 0 track, step 211 described later is executed, but if not, it is determined in step 206 whether or not the counter N has exceeded "4". Counter N
When the value exceeds "4", the storage of the image signal in the first, third, fifth and seventh areas of the memory has been completed, and therefore step 211 and the following steps are executed to reproduce the image as described later. If the counter N is less than or equal to "4",
Steps 203 et seq. Are executed again. Such actions are repeated, and the image signals of the first to fourth images are stored in the first, third, fifth and seventh areas of the memory.

In step 211, the memory clock is
The frequency f _SH is set to four times the frequency f _SL set in step 201. In step 212, the image signal stored in each area of the memory is reproduced in the field mode by this high-speed clock.

According to the example shown in FIG. 6, 4 fields recorded
Two different images are displayed as one screen. In this case as well, as in the example of FIG. 5, an image as sharp as the original image can be obtained.

[0033]

As described above, according to the present invention, it is possible to display a plurality of images on one screen without reducing the resolution of each image.

[Brief description of drawings]

FIG. 1 is a block diagram of a reproduction system of a still video device to which an embodiment of the present invention is applied.

FIG. 2 is a diagram schematically showing an example of a recording mode of an image signal stored in a memory.

FIG. 3 is a diagram showing an example of a relationship between an image signal recorded on a magnetic disk and an image signal stored in a memory.

FIG. 4 is a diagram showing an operation of a blanking sync mix circuit.

FIG. 5 is a flowchart showing a program for reproducing an image signal frame-recorded on a magnetic disk.

FIG. 6 is a flowchart showing a program for reproducing an image signal field-recorded on a magnetic disk.

[Explanation of symbols]

 26, 51 Y memory 27 RY memory 28 BY memory D Magnetic disk (recording medium)

Claims (1)

[Claims] 1. An image signal storage means for storing a plurality of sets of image signals in a memory in synchronization with a first clock, and a second set of the plurality of sets of image signals faster than the first clock. A multi-screen forming apparatus, comprising: an image signal reading means for reading out from the memory in synchronization with a clock and outputting to a high-definition display device so as to be displayed on one screen.