JP2000333114A - Recorder for recording disk medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder that records an image signal photographed and generated by a monitor camera to a single recording disk medium as an intermittent image signal for a long time and also a continuous moving picture image signal of the image signal to a recording disk medium for a prescribed period at the same time or in time division. SOLUTION: An area 13 to record continuous image data for a prescribed time and an area 14 to record intermittent image data by one frame per second are included in a recording disk medium 11, and the recorder writes and records the image data to the recording medium at the same time or in time division through recording heads.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to long-time image recording (time lapse) used for monitoring, and more particularly to a disk capable of recording for a long time by using a disk-shaped recording medium instead of a magnetic tape. The present invention relates to a recording device for a recording medium.

[0002]

2. Description of the Related Art Conventionally, in various surveillance camera systems, images and sounds captured by a camera are recorded on a magnetic tape by a time-lapse VTR capable of recording for a long time. In this time-lapse VTR, signals in a still image or a quasi-moving state are recorded intermittently on a magnetic tape at a constant interval from a temporally continuous image captured and generated by a camera. The intermittent image signal recorded on the magnetic tape depends on the length of the magnetic tape, but the longer the recording time, the longer the interval between intermittent recordings. The image is a skipped image, and the reproduced image lacks smooth motion.

A time-lapse VTR used in a surveillance camera system has a function of switching to recording of a continuous moving image in response to an alarm signal, although the intermittent image is recorded during normal image recording.
When the moving image recorded and switched to the moving image recording based on the alarm signal is reproduced, the image immediately before the alarm signal is generated may not be recorded because the recorded image before the alarm signal is generated is an intermittent image. .

For this reason, there is a problem that a recorded image cannot be obtained because it is necessary for image analysis before and after the alarm signal is generated.

A surveillance camera system having a recording device using a disk-type recording medium instead of the magnetic tape has also been developed and put into practical use. However, the recording device using this disk-type recording medium has a large recording capacity. Due to the small number, after exceeding a certain recording capacity, the moving image is recorded endlessly by overwriting on the same recording medium. For this reason, in order to record images in different time zones for a long time, a plurality of disk-type recording media are required, which causes an increase in the size and size of a housing for housing the recording media and an increase in cost.

[0006]

Conventionally, in a recording apparatus of a surveillance camera system for intermittently recording an image signal generated by a surveillance camera using a magnetic tape for a long time,
When the intermittent image signal is recorded on a magnetic tape for a long time and the intermittent image signal recorded on the magnetic tape is reproduced, a frame skipping image having a long intermittent interval is obtained, and the reproduced image lacks smoothness.

[0007] Further, an abnormal state is detected by some detecting means during photographing by the surveillance camera, and an alarm signal is generated. When recorded on the magnetic tape, the recorded image immediately before the occurrence of the alarm signal is an intermittent image.Therefore, the image immediately before the occurrence of the alarm signal may be missing. There was a problem that the state could not be verified.

Further, when a disc-shaped recording medium is used as the image recording medium of the surveillance camera system, a new image is overwritten on the same recording medium every fixed recording time because the recording capacity is small. That means
There was a problem that images in different time zones could not be recorded for a long time.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention records an image signal captured and generated by the surveillance camera for a long time as an intermittent image signal on a single disk-shaped recording medium, and continuously outputs the image signal. It is an object of the present invention to provide a recording apparatus for recording the information on the disk-shaped recording medium simultaneously or in a time-division manner for a certain period.

[0010]

A recording apparatus for a disk-type recording medium according to the present invention is capable of recording various data and is divided into a continuous recording area for recording continuous recording data and an intermittent recording area for recording intermittent recording data. A disk-type recording medium having a recording area, and in a continuous recording area of the disk-type recording medium, while generating and recording continuous recording information data consisting of temporally continuous image information and audio information or other information, After recording the continuous recording information data in the continuous recording area for a certain period, continuous information data generating and recording means for overwriting new continuous recording information data, and a temporally continuous recording in the intermittent recording area of the disk-type recording medium. Intermittently composed of still image information extracted at regular intervals from the image information to be processed and audio information or other information compressed on the time axis. Intermittent information data generating and recording means for generating and recording recording information data, wherein the continuous information data generating and recording means and the intermittent recording information data generating and recording means are simultaneously driven to produce the continuous information data generating and recording means. And recording the intermittent recording information data generated by the intermittent recording information data generating and recording means in the intermittent recording area of the disc type recording medium. It is characterized by the following.

In the recording apparatus for a disk-type recording medium according to the present invention, the continuous recording information data generating and recording means and the intermittent recording information data generating and recording means are driven in a time-division manner. Recording the intermittent recording information data generated by the intermittent recording information data generating and recording means in the intermittent recording area of the disc type recording medium while recording the continuous recording information data in the continuous recording area of the disc type recording medium. And

Further, the recording apparatus for a disk-type recording medium according to the present invention can record various data, and has a recording area divided into a continuous recording area for recording continuous recording data and an intermittent recording area for recording intermittent recording data. A disk-type recording medium having, and in a continuous recording area of the disk-type recording medium, while generating and recording continuous recording information data consisting of temporally continuous image information, audio information or other information, and in the continuous recording area After recording the continuous recording information data for a certain period, the continuous information data generating and recording means for overwriting the new continuous recording information data, and at a constant interval among the continuous recording information data generated by the continuous information data generating and recording means. Storage means for generating and storing intermittent recording information data including extracted still image information and time-axis-compressed audio information Intermittently recorded information data stored in the storage means while driving the continuous information data generation and recording means in a time-division manner and recording the continuous recording information data in a continuous recording area on the disk-type recording medium. Is recorded in the intermittent recording area of the disk-type recording medium.

Still further, at least still image information of the intermittent recording information data generated by the intermittent information data generating and recording means of the disk type recording medium recording apparatus of the present invention is one frame per second of the temporally continuous image information. It is characterized in that it is a unit of still image information.

According to the recording apparatus for a disk-type recording medium of the present invention, a time-sequential moving image signal captured and generated by a surveillance camera is stored in a continuous recording area of a single disk-type recording medium. The overwrite recording is performed every time, and the intermittent image signal of the still image for each certain time unit extracted from the moving image signal captured and generated by the monitoring camera is simultaneously or time-divided in the intermittent recording area of the disk-type recording medium. By recording for a long time, an image captured and generated by the surveillance camera can be recorded on a single disk-type recording medium for a long time. In addition, it is possible to recognize and reproduce an image captured by the surveillance camera based on a continuous moving image signal recorded in the continuous recording area from a surveillance camera image generation image signal before and after the occurrence of an alarm signal at the time of abnormality.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a recording apparatus for a disk-type recording medium according to the present invention,
FIG. 1A is a plan view showing a configuration of a disk-type recording medium used in the present invention, and FIG. 1B is a block diagram showing a configuration of a recording apparatus.

FIG. 1A shows a disk-shaped recording medium called a hard disk, DVD, or MO as a recording medium instead of a magnetic tape. Various information data can be rewritten by light or magneto-optics. Such a recording medium is, for example, a disk-type recording medium 11 called a DVD-RAM having a recording capacity of 4.7 GB on one side.

An FAT constituting various information data to be recorded on the recording medium 11 is provided on the inner peripheral side of the surface of the recording medium 11.
A data address recording area 12 for recording data such as an address, a continuous recording area 13 for recording continuous image data of a temporally continuous moving image to be described later on the outer peripheral side of the data address recording area 12; 1
3 is divided into an intermittent recording area 14 for storing still image data extracted at regular intervals from continuous image data of a temporally continuous moving image described later.

Each of the recording areas 12 to 1 of the recording medium 11
4 is generated and recorded by the recording device shown in FIG. 1B. In this recording device, an image signal captured and generated by a monitoring camera (not shown) is supplied to an image compression circuit 21 and encoded and compressed by, for example, a JPEG method of image signal compression. On the other hand, an audio signal generated by a microphone (not shown)
The audio signal processing circuit 22 performs an encoding process. The image data encoded and compressed by the image compression circuit 21 and the audio data encoded by the audio signal processing circuit 22 are added by a continuous addition circuit 23 to synthesize a temporally continuous moving image and audio. Generate data. The continuous combined data generated by the continuous addition circuit 23 is supplied to a continuous recording head 27 via a continuous recording circuit 26,
In the continuous recording area 13.

The continuous recording circuit 26 converts the temporally continuous synthesized data supplied from the continuous addition circuit 23 into
For example, after supplying the synthetic data for two minutes to the continuous recording head 27 and recording it in the continuous recording area 13 of the recording medium 11, the recording operation of the continuous recording head 27 is controlled to produce the synthetic data for the next two minutes. Is started from the writing start position of the continuous recording area 13 of the recording medium 11.

That is, in the continuous recording area 13 of the recording medium 11, continuous composite data composed of continuous moving images and audio signals that are temporally continuous for two minutes from the start of recording is recorded, and the next two minutes are recorded. It is designed to overwrite successively synthesized data which is continuously continuous. This allows
In the continuous recording area 13, continuous moving image data for the latest two minutes is recorded.

On the other hand, the audio data converted into encoded data by the audio signal processing circuit
, And is supplied to the intermittent addition circuit 25.
The intermittent addition circuit 25 includes, for example, one of the image signals generated by the image compression
The image data for the frame is taken in and added to the compressed audio data from the time axis compression circuit 24 to generate synthesized intermittent data. The intermittent composite data generated by the intermittent addition circuit 25 is supplied to an intermittent recording circuit 28, and under the control of the intermittent recording circuit 28, the intermittent recording area 14 of the recording medium 11 via an intermittent recording head 29. The intermittent composite data is recorded in the second row.

The intermittent recording circuit 28 sequentially stores the other data signals supplied to the intermittent adding circuit 25, for example, the date and time data and the intermittent recording area 14 of the recording medium 11 as the time of the intermittent composite data recording elapses. Of the position to be recorded in the camera. The recording position data of the intermittent composite data is recorded in the data address recording area 12 of the recording medium 11.

In the recording device, the image resolution is set to 72
0 × vertical 480, compression ratio 1/10 (compression method JPE
G) The capacity required for recording continuous composite data every two minutes in the continuous recording area 13 of the recording medium 11 under the condition of Y: U: V = 4: 2: 0 is as follows: The value is shown in Expression 1.

[0024]

## EQU1 ## 720 (horizontal resolution) × 480 (vertical resolution)
× 8bit × 1.5 (YUV) × 30 (frame) × 60 (sec)
× 2 (minutes) × 1/10 (compression) × 1/8 (bytes) = 1
87 MB Further, the capacity required to record the intermittent image data of one frame per second in the intermittent recording area 14 of the recording medium 11 under the same conditions of the image resolution, the compression ratio, and the signal processing is the value shown in Expression 2.

[0025]

## EQU2 ## 720 (horizontal resolution) .times.480 (vertical resolution)
X 8bit x 1.5 (YUV) x 1/10 (compression) x 1/8 (byte) x 3600 (frame / time) x 24 (time) =
4.48 GB The total capacity of Equation 1 and Equation 2 is Equation 1 + Equation 2 = 1
87 MB + 4.48 GB = about 4.67 GB, and the disk type recording medium 11 has a capacity of 4.7 GB
Using the VD-RAM, intermittent image data of one frame per second can be recorded for 24 hours, and continuous moving image data overwritten every two minutes can be recorded.

Thus, when the reproduction process is performed based on the intermittent composite data recorded in the intermittent recording area 14 of the recording medium 11, a still image of one frame per second is reproduced.
This makes it possible to reproduce a smooth quasi-moving image with a short frame skipping interval.

When an abnormal state is detected by an abnormal state detecting means (not shown) of the picked-up image, when the abnormal state is detected, compressed image data of one frame per second extracted from the image compression circuit 21 in the intermittent addition circuit 25 is output. The extraction and capture is stopped, and the image data compressed by the image compression circuit 21 is changed to capture of image data that is temporally continuous, and the continuous synthesized data combined with the audio data compressed by the time axis compression circuit 24 on the time axis. Is generated, and the continuous combined data is recorded in the intermittent recording area 14 of the recording medium 11.

Alternatively, by using drive control means for the continuous recording head 27 (not shown),
Is moved to the intermittent recording area 14 of the recording medium 11 so that the continuous combined data is recorded in the intermittent recording area 14.

Thus, when an abnormal condition occurs, continuous synthetic data for about 2 minutes immediately before the abnormal condition occurs is recorded in the continuous recording area 13, and the continuous synthetic data after the abnormal condition occurs is recorded in the intermittent recording area 14. The image can be reproduced from two minutes before the occurrence of the abnormal condition based on the continuous combined data recorded in the two recording areas 13 and 14.

In the above-described embodiment of the present invention, the recording operation of the continuous recording circuit 26 and the continuous recording head 27 and the recording operation of the intermittent recording circuit 8 and the intermittent recording head 29 are performed simultaneously. However, the continuous recording head 2
After recording all frame image data for one second at 7, the continuous recording head 27 and the intermittent recording head 29 are time-divisionally driven and controlled so that the intermittent recording head 29 records one frame of intermittent image data. Thus, predetermined data can be recorded in a predetermined recording area.

Next, another embodiment of the present invention will be described with reference to FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

A video signal picked up and generated by a camera (not shown) is supplied to an adder 31 with image data encoded and compressed by an image compressor 21. The audio signal generated by the microphone (not shown) is generated by adding the audio data encoded by the audio signal processing circuit 22 to the addition circuit 31.
And the audio data obtained by time-axis compressing the audio data by the time axis compression circuit 24 is added to the addition circuit 31.
To supply.

The addition circuit 31 is provided with the image compression circuit 2
1 is added to the audio data from the audio signal processing circuit 22 by a continuous addition circuit 31a to generate continuous synthesized data.
The intermittent addition circuit 31b adds the image data for one frame per second of the image data from 1 and the audio data compressed in the time axis by the time axis compression circuit 24 to generate intermittent combined data. Further, the data added by the intermittent addition circuit 31b of the addition circuit 31 is temporarily stored in a memory (not shown).

The continuous combined data and the intermittent combined data generated by the adding circuit 31 are supplied to a recording head 33 via a recording circuit 32 and recorded on the recording medium 11.

The recording circuit 32 and the recording head 33 select the composite data to be read from the adding circuit 31 based on the read / head control signal, and record a recording area when the read composite data is recorded on the recording medium 11. Make a selection. When the recording circuit 32 selects reading of the temporally continuous synthesized data added and generated by the continuous addition circuit 31a of the addition circuit 31, the recording head 33
Controls the drive so that the continuous composite data supplied from the recording circuit 32 is written and recorded in the continuous recording area 13 of the recording medium 11, and the recording circuit 32
When the reading of the intermittent combined data of the first intermittent addition circuit 31b is selected, the recording head 33 reads the intermittent combined data supplied from the recording circuit 32 into the recording medium 11.
Drive control to write and record in the intermittent recording area 14.

In the continuous recording area 13 of the recording medium 11, for example, a capacity for writing and recording two minutes of continuous combined data is set, and the latest two minutes of continuous combined data is always overwritten and recorded. So that

That is, the recording circuit 32 and the recording head 33 are made common, and the writing and recording operations of the continuous combined data and the intermittent combined data are time-divisionally controlled to drive the data selected and read by the recording circuit 32. The recording is performed in a predetermined continuous recording area 13 or an intermittent recording area 14 of the recording medium 11.

As a result, the recording circuit 32 and the recording head 33 for writing and recording data on the recording medium 11 can be implemented by a single circuit, and the recording apparatus can be downsized.

The recording circuit 32 and the recording head 33
The read / head control signal can be generated based on the synchronizing signal of the video signal as described above.

Also, changing the data recorded in the intermittent recording area when the image picked up by the camera described in the above-described embodiment of the present invention has an abnormality to the continuous composite data can be similarly performed. The present invention can be implemented in other embodiments.

Further, the recording heads 27, 29, 33
Is an optical head using a laser when the recording medium 11 is a DVD-RAM, a magnetic head when using an HDD, and a magneto-optical head when using MO.

As described above, the present invention provides an area for recording continuous image data for a predetermined time on a disk-type recording medium and an area for recording intermittent image data for one frame per second. The image data to be generated is generated, and the image data is written or recorded on the recording medium simultaneously or in a time-division manner via a recording head.

[0043]

The recording apparatus for a disk-type recording medium according to the present invention provides a continuous recording area and an intermittent recording area on a single disk-type recording medium and outputs a temporally continuous moving image signal captured and generated by a monitoring camera. The intermittent image signal overwritten in the continuous recording area at a certain time interval and the still image intermittent image signal for each certain time unit extracted from the moving image signal captured and generated by the surveillance camera is stored in the intermittent recording area. Simultaneous or time-divisional recording at the time of recording in the recording area enables long-term recording of images captured and generated by the surveillance camera on a single disk-type recording medium, and generation of alarm signals when abnormal. With the effect that it is easy to recognize the captured image content of the surveillance camera based on the continuous moving image signal recorded in the continuous recording area by the surveillance camera image generated image signal before and after the time. That.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a recording apparatus for a disk-type recording medium according to the present invention, FIG. 1 (a) is a plan view showing the configuration of a disk-type recording medium, and FIG. FIG.

FIG. 2 is a block diagram showing the configuration of another embodiment of the recording device for a disk-type recording medium according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Disc-shaped recording medium 12 ... Data address recording area 13 ... Continuous recording area 14 ... Intermittent recording area 21 ... Image compression circuit 22 ... Audio signal processing circuit 23 ... Continuous addition circuit 24 ... Time axis compression circuit 25 ... Intermittent addition circuit 26 ... Continuous recording circuit 27 ... Continuous recording head 28 ... Intermittent recording circuit 29 ... Intermittent recording head

Claims (2)

[Claims] 1. A recording apparatus for a disk-type recording medium for recording image data on a disk-type recording medium, wherein the disk-type recording medium is provided with at least a continuous recording area and an intermittent recording area. Recording means for recording still image data in the intermittent recording area, continuous recording means for overwriting moving image data in the continuous recording area at regular intervals, and still image data extracted from a moving image in the intermittent recording area. Intermittent recording means for recording; and means for driving the continuous recording means and the intermittent recording means in a time-division manner, wherein time-division recording is performed in the continuous recording area and the intermittent recording area. apparatus. 2. The disk type according to claim 1, further comprising: means for independently driving said continuous recording means and said intermittent recording means, wherein recording is performed independently on said continuous recording area and said intermittent recording area. A recording device for a recording medium.