JPH0832991A - System and device for recording and reproducing still image - Google Patents

Abstract

PURPOSE:To provide a system and the device for still image recording and reproducing which convert analog video signals different by systems or analog RGB signals of various systems to prescribed digital RGB signals to record and reproduce them on the same recording medium CONSTITUTION:An NTSC decoder 1, a PAL decoder 2, and a SECAM decoder 3 convert video signals different by forms to analog RGB signals. Analog RGB signals selected by an analog input switching circuit 4 are converted to digital RGB signals by an AD converter 5. Digital RGB signals stored in a video memory 8 through an input switching circuit 6 are recorded in a magneto-optical disk device through a magneto-optical disk interface circuit 9. Signals are reproduced by the operation opposite to that of recording, and analog video signals of respective systems are outputted by an NTSC encoder 11, a PAL encoder 12, and a SECAM encoder 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image recording / reproducing method and a still image recording / reproducing apparatus, and more particularly, to the same still image signals of different formats from a plurality of sources such as a computer screen output and a video signal output apparatus. The present invention relates to a method and apparatus for recording / reproducing with an image recording / reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, a system for recording moving image data of a video device, a television receiver or the like from a composite video signal of various single systems as still image digital data on a disk device, and an RGB signal for a video signal in real time. A system that is converted to and displayed on the TV screen,
On the contrary, there is known a system for converting a video signal into an RGB signal and displaying it on a CRT display for a computer.

[0003]

However, in the above-mentioned conventional still image recording / reproducing apparatus, the still image that can be recorded / reproduced is limited to one specific system. For example, an NTSC television signal. In order to record and reproduce each system analog signal on the computer screen as a still image, a recording and reproducing device is required for each system, and one recording and reproducing device cannot cope with diversifying demands. There was a point.

In the conventional still image recording / reproducing apparatus, an image input by analog RGB signals is also converted into an analog video signal and then recorded on a recording medium. Therefore, the reproduced signal is an analog signal. There is a problem that an image with a low definition is obtained, which is greatly reduced from the original resolution of the RGB signal.

In view of the above problems, it is an object of the present invention to provide a still image recording / reproducing system and still image in which analog video signals of different systems or analog RGB signals of various systems can be recorded and reproduced on the same recording medium. A recording / reproducing apparatus is provided.

Another object of the present invention is to provide analog video signals of different systems or analog R of various systems.
It is an object of the present invention to provide a still image recording / reproducing system and a still image recording / reproducing apparatus in which a GB signal is converted into a predetermined digital RGB signal and recorded / reproduced to prevent deterioration of image resolution and definition.

[0007]

In order to solve the above problems, the present invention has the following constitution. That is, according to the first aspect of the present invention, a plurality of input image signals of different formats are converted into digital RGB signals of a predetermined format, and the digital RGB signals are respectively divided into R area G area B area and still image storage area of the recording medium. It is a still image recording method characterized by being stored in each.

In the first aspect of the invention, the R area and the G area of the still image storage area are selected according to the format of the input image signal in which the converted digital RGB signal has the maximum data amount.
The capacity of the area and the area B can be secured.

The second invention is the R region, G region, and B region, respectively.
Still image reproduction characterized by reproducing a digital RGB signal from a still image storage area of a recording medium divided into areas, converting the digital RGB signal into an image signal of a format compatible with a still image output device, and outputting the image signal. It is a method.

According to a third aspect of the invention, there is provided a first signal converting means for converting a plurality of input image signals of different formats into digital RGB signals of a predetermined format, and at least one screen for storing the digital RGB signals as a still image. Video memory, recording means for storing still images stored in the video memory in still image storage areas of a recording medium divided into R areas, G areas and B areas, respectively, and still images recorded from the recording medium. Reproducing means for reproducing an image and storing it in a video memory as the digital RGB signal;
A still image recording / reproducing device, comprising: a second signal converting means for reading the digital RGB signal from the video memory, converting the image signal into an image signal of a format compatible with a still image output device, and outputting the image signal.

Further, in the third invention, at least the video memory for two screens is provided, and while the still image stored in the first video memory is being reproduced, the still image to be reproduced next is recorded on the recording medium. To a second video memory.

In the third invention, a magneto-optical disk can be used as the recording medium.

[0013]

According to the present invention having the above structure, various types of analog video signals and analog RGB signals are converted into predetermined digital RGB signals, and the digital RGB signals are temporarily stored in a still image memory (video memory). Then, the digital RGB signals read from the still image memory are recorded in the R area, the G area, and the B area, which are preformatted for each still image, of the recording medium.

At the time of reproducing a still image, one still image is selected from a plurality of still images stored in the recording medium, and digital RGB signals read from the R area, G area and B area in which the still image is stored are selected. Once stored in the still image memory. Then, the digital RGB signal is read out from the still image memory, converted into an analog video signal, an analog RGB signal, etc. which are suitable for the image display system of the still image reproducing apparatus and outputted.

As a result, one still image storage device can be used for a plurality of types of television signals or various types of video equipment.
Still images can be captured and stored from the output of a computer and the like, and the read still images can be output to image output devices of different systems.

[0016]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic block diagram showing the configuration of an embodiment of a still image recording / reproducing apparatus according to the present invention. In the figure, the still image recording / reproducing apparatus of the present embodiment is an NT that decodes an NTSC composite color signal into an analog RGB signal.
SC decoder 1, PAL decoder 2 for decoding PAL composite color signals into analog RGB signals, and SEC
SECAM decoder 3 for decoding an AM composite color signal into an analog RGB signal, and three systems of analog RGB signal and analog RG converted from the composite color signal
An analog input switching circuit 4 for selecting an analog RGB signal input from the B input, an AD converter 5, an input switching circuit 6, an input / output switching circuit 7, and a VRAM / R8-
1, a video memory 8 including VRAM / G8-2 and VRAM / B8-3, a magneto-optical disk interface circuit 9, a magneto-optical disk device 10, and an NTS that encodes an NTSC composite color signal from analog RGB signals.
C encoder 11 and PAL encoder 12 that encodes a PAL composite color signal from analog RGB signals
And a SECAM encoder 13 for encoding a SECAM composite color signal from an analog RGB signal, an analog output switching circuit 14, a DA converter 15, an output switching circuit 16, a system control circuit 17, and an operation console 18. Further, in FIG. 1, the data path is shown by a solid line and the control path is shown by a broken line.

The operation of the embodiment having the above structure is as follows. First, as a still image input signal to be recorded, the NTS
C composite color signal, PAL composite color signal, SECAM
Composite color signal, analog RGB signal and digital R
A GB signal can be input.

The NTSC composite color signal, the PAL composite color signal and the SECAM composite color signal are respectively NT
It is decoded into an analog RGB signal by the SC decoder 1, the PAL decoder 2 and the SECAM decoder 3. The configurations and functions of the respective decoders 1, 2 and 3 are
The circuit corresponds to a circuit for generating an analog RGB signal from a signal after video detection, which is used in each television receiver, and is well known to those skilled in the art, and therefore detailed description thereof will be omitted. The analog RGB signals decoded by the decoders 1, 2 and 3 are input to the analog input switching circuit 4, respectively.

Next, the signals output from various image signal output devices such as personal computers, which are analog RGB signal input sources, are adjusted to appropriate signal levels by an input signal level adjusting circuit (not shown), and the analog input switching circuit 4 is provided. Entered in. The four analog RGB signals thus inputted to the analog input switching circuit 4 are
One system of analog R by the instruction of system control circuit 17
Only the GB signal is selected and input to the AD converter 5.

The AD converter 5 converts the analog RGB signals output from the analog input switching circuit 4 into digital R signals.
It is converted into a GB signal and output to the input switching circuit 6. At this time, although the horizontal frequency, the number of scanning lines, etc. differ depending on the various devices selected by the analog input switching circuit 4, a dot clock locked to the horizontal synchronizing signal of the input signal is generated and AD conversion is performed using this as a sampling clock. To do.

Further, with respect to the digital RGB signal input, an input signal level adjusting circuit (not shown) adjusts the input signal level which is different for each connected model to a constant level and is input to the input switching circuit 6. Input switching circuit 6
Selects the output of the AD converter 5 and the digital RGB input signal according to an instruction from the system control circuit 17.

The input / output switching circuit 7 is the system control circuit 1
Switch to the input mode by the input / output switching signal from 7.
R data, G data, and B data from the input switching circuit 6 are selected to be VRAM.R8-1, VRAM.
It outputs in parallel to one port of G8-2 and VRAM B8-3. VRAM / R8-1, VRAM / G8-2
The video memory 8 including VRAM and BRAM-B8-3 is composed of a dual port memory, and one of the ports is a serial port and is the input / output switching circuit 7
It is connected to the.

The parallel port, which is the other port of the video memory 8, is connected to the magneto-optical disk interface circuit 9
Are connected, and the video memory 8 is read at a reading speed according to the recording speed of the magneto-optical disk device 10. The read signal of the video memory 8 is recorded on a magneto-optical disk (not shown) built in the magneto-optical disk device 10. At this time, assuming that the storage area of the magneto-optical disk is divided into the R area, the G area, and the B area in this order for each still image storage area, as shown in FIG. 2, the video memory 5 is correspondingly divided. The order of reading from is also R, G, and B.

By the way, since the amount of still image data after digital conversion differs depending on the connected image input / output device, a still image with a capacity equal to the largest amount of still image of all connected devices is used. It is assumed that the data area of the magneto-optical disk is pre-formatted in order to secure a storage area for each.

Next, the reproducing operation will be described. The digital image data reproduced from the magneto-optical disk device 10 in the order of R data, G data, and B data is transferred through the magneto-optical disk interface circuit 9 to the VRAM / R8-1,
The data is written in the video memory 8 in the order of VRAM / G8-2 and VRAM / B8-3. Next, the digital RGB signals forming one still image are VRAM R8-1,
The data is read in parallel from the VRAM / G8-2 and the VRAM / B8-3 and sent to the input / output switching circuit 7.

The input / output switching circuit 7 is the system control circuit 1
The digital RGB read from the video memory 8 is switched to the output mode by the input / output switching signal from
The signal is sent to the output switching circuit 16. Output switching circuit 1
6 outputs a digital RGB signal to the DA converter 15 or a digital RG via a buffer amplifier (not shown) according to an instruction from the system control circuit 17.
Switches whether to output to the B output terminal.

Further, when the signal required by the device for outputting the still image is a signal other than the digital RGB signal,
That is, NTSC composite color signal, PAL composite color signal, SECAM composite color signal and analog RGB
In the case of a signal, the DA converter 15 outputs the analog RGB signal DA-converted, and the analog output switching circuit 14 selects the encoder 11, 12, 13 or analog RGB output to be output.

The NTSC encoder 11 is an analog RGB
Encode NTSC composite color signal from signal, PA
The L encoder 12 encodes the PAL composite color signal from the analog RGB signal, and the SECAM encoder 13
Encodes a SECAM composite color signal from an analog RGB signal. Each encoder 11, 12, 1
The configuration and function of 3 correspond to a circuit used to output an image from a personal computer or the like to each television receiver, and are well known to those skilled in the art, and thus detailed description thereof will be omitted. Thus, NTSC composite color signal, PAL composite color signal, or SECAM
The composite color signal is output to reproduce a still image.

The operation console 18 is in charge of operation inputs at the time of recording and reproduction, and operates operations such as designation of image input / output equipment to be connected, instruction of recording mode and reproduction mode, and retrieval instruction of recorded still image. Operation console 1
It can be done from 8. In addition, the system control circuit 17
In accordance with an instruction from the operation console 18, the control unit controls the switching circuit of each unit, the magneto-optical disk interface circuit 9, the read / write clock timing of the video memory 8, and the like.

FIG. 3 is a partial block diagram showing the configuration of the video memory of the second embodiment. In the present embodiment, instead of the video memory 8 of FIG. 1, a video memory 80 having a so-called double buffer structure is used by using video memories 8a and 8b each having a capacity of one frame. That is, in FIG. 3, one port of the video memory 8a and the video memory 8b each having a capacity of one frame is connected to the input / output switching circuit 7 via the switching circuit 84, and the video memory 8a and the video memory 8b are connected. The other port is connected to the magneto-optical disk interface circuit 9 via the switching circuit 85. Other configurations are similar to those of the first embodiment shown in FIG.

In the present embodiment, the system control circuit 1 includes the video memories 8a and 8b for one frame, respectively.
7 independently addressed. For example, when reading for still image reproduction is being performed from the video memory 8a via the switching circuit 84, the still image to be reproduced next is read from the magneto-optical disk device 10 in parallel with this reading and switched. Data can be written to the video memory 8b via the circuit 85 and the magneto-optical disk interface circuit 9.

At any time after the completion of reading the still image to be displayed next, the video memory output from the switching circuit 84 is switched from the video memory 8a to the video memory 8b in accordance with an instruction from the operation console 18, thereby instantaneously Then, the next still image can be output to the reproducing device.

[0033]

As described above, according to the present invention, 1
To provide a still image recording / reproducing system and a still image recording / reproducing device capable of recording / reproducing analog video signals of different systems or analog RGB signals of various systems on the same recording medium in a system configuration including one still image recording / reproducing device. There is an effect that can be.

According to the present invention, different types of analog video signals or various types of analog RGB signals are used.
There is an effect that it is possible to provide a still image recording / reproducing system and a still image recording / reproducing apparatus in which a signal is converted into a predetermined digital RGB signal and recorded / reproduced to prevent deterioration of image resolution and definition. Further, according to the present invention, when a still image to be reproduced next is known in advance, the still image can be read from the still image recording / reproducing medium in advance. Can be displayed on the screen, and the waiting time for reading from the recording medium can be eliminated.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a first embodiment of a still image recording / reproducing apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a recording format of a magneto-optical disk in the example.

FIG. 3 is a block diagram showing a video memory having a double buffer structure used in a second embodiment of the still image recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 1 NTSC decoder 2 PAL decoder 3 SECAM decoder 4 Analog input switching circuit 5 AD converter 6 Input switching circuit 7 Input / output switching circuit 8 Video memory 8-1 VRAM / R 8-2 VRAM / G 8-3 VRAM / B 9 Magneto-optical Disk interface circuit 10 Magneto-optical disk device 11 NTSC encoder 12 PAL encoder 13 SECAM encoder 14 Analog output switching circuit 15 DA converter 16 Output switching circuit 17 System control circuit 18 Operation console

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04N 5/91 H04N 5/91 J

Claims (6)

[Claims] 1. A plurality of input image signals of different formats are converted into digital RGB signals of a predetermined format, and the digital RGB signals are stored in a recording medium having a plurality of still image storage areas each consisting of an R area, a G area and a B area. Still image recording method characterized by: 2. The capacities of the R area, G area and B area of the still image storage area according to claim 1, according to the format of the input image signal in which the converted digital RGB signal has the maximum data amount. Still image recording method characterized by being secured. 3. A digital RGB signal is reproduced from a still image storage area of a recording medium divided into R area, G area and B area, and the digital RGB signal is converted into an image signal of a format compatible with a still image output device. A still image playback method characterized by outputting as 4. A first signal converting means for converting a plurality of input image signals of different formats into digital RGB signals of a predetermined format, and a video memory for at least one screen for storing the digital RGB signals as a still image. Recording means for respectively storing still images stored in the video memory in still image storage areas of a recording medium divided into R areas, G areas and B areas, and reproducing the recorded still images from the recording medium. A reproducing means for storing the digital RGB signal as a digital RGB signal in a video memory, and a digital RGB signal read from the video memory for conversion into an image signal of a format compatible with a still image output device and outputting the second image signal.
And a signal converting means of the above. 5. The recording medium according to claim 4, wherein at least the video memory for two screens is provided, and the still image to be reproduced next is reproduced while the still image stored in the first video memory is reproduced. To a second video memory, the still image recording / reproducing apparatus. 6. A still image recording / reproducing apparatus according to claim 4, wherein a magneto-optical disk is used as the recording medium.