JP3154182B2 - Video signal recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording and reproducing apparatus, and records and reproduces a still image as a digital video signal in a so-called PCM audio area of a magnetic tape used in a so-called 8 mm video tape recorder or the like. The present invention relates to a video signal recording / reproducing device.

[0002]

2. Description of the Related Art As a device for recording a video signal obtained by photographing a subject on a recording medium, for example, a magnetic recording medium,
For example, a so-called electronic still camera that records a video signal of a still image on a so-called still video floppy, or a so-called camera-integrated 8 mm video tape recorder (hereinafter, referred to as a camera-integrated 8 mm VTR) that records a video signal of a moving image on a magnetic tape, for example
Etc. are known.

Specifically, for example, a camera-integrated 8 mm VT
In R, a magnetic tape is wound around a so-called rotary head drum at an angle of 211 degrees, and a pair of heads at 180-degree intervals (hereinafter referred to as rotary heads) scan the magnetic tape helically, as shown in FIG. Then, an oblique track 81 is formed on the magnetic tape 80. In a video area 82 corresponding to 180 degrees of the rotating head drum of each track 81, a luminance signal is FM-modulated, a carrier chrominance signal is converted to a low frequency, an audio signal is FM-modulated, and a tracking servo signal is used. A tracking signal, for example, a pilot signal for so-called ATF (Automatic Track Finding) control is frequency-multiplexed and recorded. The PCM audio area 8 corresponding to about 30 degrees of the remaining rotating head drum of each track 81
Reference numeral 3 denotes a digital audio signal of 8 bits / sample (hereinafter referred to as a PCM audio signal) which has been subjected to a so-called cross interleave code processing for error correction, and then a synchronization signal, parity, ID, etc. Is added and recorded. A cue track 84 and an audio track 85 are formed on both sides of the magnetic tape 80 by scanning with a fixed head. The cue track 84 records a cue signal used for, for example, the address of a recorded content or the beginning of a recorded content, and the audio track 85 includes, for example, a post-record (afte).
r recording) audio signal is recorded.

Further, as disclosed in, for example, Japanese Patent Application Laid-Open No. 58-164383, a title, a cast, a description, and the like are superimposed on a moving image recorded in the video area 82 to be displayed (superimposed). In addition, there is known a technique in which a still image such as character information is photographed and recorded (after-recording) in the PCM audio area 83.

[0005]

The above-mentioned electronic still camera is generally known as a device for recording a video signal of a still image.
It is conceivable to use the TR as a video signal recording / reproducing apparatus for recording or reproducing a still image as a digital video signal in a PCM audio area.

In this case, the recording system of the camera-integrated 8 mm VTR uses an image pickup device such as a CCD image sensor (hereinafter, referred to as a CCD) or the like, and a so-called AGC (Automatic Transfer Control).
The camera unit includes an AGC circuit for applying matic gain control, a so-called camera process circuit for performing various kinds of signal processing on the video signal, and a head unit for recording the video signal from the camera unit on a magnetic tape. Further, the camera process circuit includes so-called contour compensation (aperture distortion compensation), pedestal clamp, white clip, knee,
Various signal processing circuits such as gamma correction and black clip are provided. These signal processing circuits, for example, a contour compensation circuit are for compensating for the insufficiency of a high frequency component of a spatial frequency of an optical system or an image pickup device. For example, a pedestal clamp is a so-called pedestal level which is a reference of a black level. Does not change. On the other hand, the reproducing system includes a head unit for reproducing a video signal from a magnetic tape, and a so-called video process circuit for performing various kinds of signal processing on the reproduced video signal. Further, the video processing circuit is also provided with various signal processing circuits such as contour compensation and pedestal clamp. These signal processing circuits, for example, the contour compensation circuit are for compensating for the deterioration of the high frequency component of the video signal in the reproduction system. For example, the pedestal clamp is for preventing the pedestal level from changing.

The characteristics of the signal processing circuits of the recording system and the reproduction system are such that, for example, high-frequency components of a luminance signal are not sufficiently reproduced so as to be optimal for recording or reproducing a video signal of a moving image. Is set so that a so-called inversion phenomenon caused by the above does not occur. Therefore, if these signal processing circuits are also used when recording or reproducing a video signal of a still image, signal processing such as contour compensation suitable for recording or reproducing the video signal of a still image cannot be performed. become. Although it is conceivable to use dedicated signal processing circuits for recording and reproducing the video signal of the moving image and recording and reproducing the video signal of the still image, however, there is a cost problem.

The present invention has been made in view of such circumstances, and performs signal processing at the time of reproducing a video signal, such as contour compensation and pedestal clamp, using camera information, such as lens aperture, shutter speed, and the like. It is an object of the present invention to provide a video signal recording / reproducing apparatus which can automatically perform optimal reproduction of each video signal of a moving image and a still image based on the gain of AGC and the like.

[0009]

According to the present invention, a video signal obtained by photographing a subject by a camera unit is recorded / reproduced as a moving picture video signal or a still picture video signal by a recording / reproducing means via a recording medium. A video signal recording / reproducing apparatus, comprising: a moving image shooting mode for recording a moving image video signal; a moving image playback mode for reproducing a moving image video signal; a still image shooting mode for recording a still image video signal; In addition to setting the playback mode of the still image that plays the video signal,
A control unit for outputting camera information indicating an imaging condition set in the camera unit; and in a moving image shooting mode, a video signal from the camera unit is subjected to signal processing and supplied to the recording / reproducing means as a moving image video signal. Also, in the moving image playback mode, a moving image signal processing unit that performs signal processing on the moving image signal reproduced from the recording medium by the recording / reproducing means and outputs the processed signal, and in the still image shooting mode, the camera unit 1
0 to perform signal processing on the video signal from 0 to obtain a still video signal, supply the still video signal together with the camera information supplied from the control unit to the recording / reproducing means,
In the still image reproduction mode, the recording / reproducing means performs signal processing on the still image video signal reproduced together with the camera information from the recording medium, supplies the processed signal to the moving image video signal processing unit, and reproduces the still image video signal from the recording medium. A still image video signal processing unit that supplies camera information to the control unit,
The control unit controls signal processing performed by the moving image video signal processing unit on a still image video signal supplied from the still image video signal processing unit based on the camera information in a still image playback mode. And

[0010]

With the video signal recording / reproducing apparatus according to the present invention, when recording a video signal, camera information indicating set imaging conditions is also recorded. Then, at the time of reproducing the video signal, the signal processing of the video signal is controlled based on the camera information so as to be optimal for the reproduction of each video signal of a moving image and a still image.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a video signal recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a so-called camera-integrated 8 mm VTR (hereinafter simply referred to as VTR), and FIG.
FIG. 2 is a block circuit diagram illustrating a circuit configuration of R.

As shown in FIG. 1, the VTR converts a captured image signal into a digital video signal and performs signal processing such as so-called contour compensation (aperture distortion compensation) and gamma correction. A video signal processing unit 20 that converts the video signal from the unit 10 into an analog signal and outputs the video signal and performs signal processing such as contour compensation on each video signal of a reproduced moving image or still image; After subjecting one frame or one field of the video signal to signal processing such as data compression processing and the like, an identification code (hereinafter referred to as ID) based on camera information such as shutter speed is added and output, and a still image A still image signal processor 30 for reproducing signals and IDs, an analog image signal from the moving image signal processor 20, and a still image signal processor 3 Digital video signal time-division multiplexed and the magnetic tape 1 so-called video area and a so-called PCM from
A head unit 40 for recording each video signal of a moving image or a still image while recording in the audio area, and the moving image video signal processing unit 20 and the still image video signal based on the ID from the still image video signal processing unit 30 In addition to controlling the processing unit 30 and the like, the lens aperture, shutter speed, AGC
And a controller 50 for supplying camera information such as the gain of the camera.

The camera section 10 performs various kinds of signal processing on a video signal obtained by photographing a subject, for example, contour compensation for compensating for insufficiency of a high frequency component of a spatial frequency of an optical system or an image pickup device, black contouring, or the like. A signal processing such as a so-called pedestal clamp is performed so that a so-called pedestal level serving as a level reference does not change. To be supplied. This camera unit 10
Is a CCD image sensor (hereinafter referred to as CCD) 11
And after applying the so-called AGC (Automatic Gain Control) after sampling the imaging signal from the CCD 11
/ H & AGC circuit 12, an analog / digital (hereinafter A / D) converter 13 for converting a sampled video signal from the S / H & AGC circuit 12 into a digital signal, and a digital signal from the A / D converter 13. For example, the S / H & AGC circuit 1 is applied to the converted video signal.
Camera processing circuit 1 that performs various signal processing such as contour compensation, pedestal clamp, white clip, knee, gamma correction, and black clip based on the gain of 2, etc.
And 4.

The moving image signal processing section 20 converts the digital image signal from the camera section 10 into an analog image signal and supplies the analog image signal to the head section 40, and the head section 40 under the control of the control section 50. The video signal from the still picture video signal processing section 40 or the still picture video signal processing section 30 is subjected to various kinds of signal processing, for example, contour compensation for compensating for deterioration of high frequency components in a reproduction system, and pedestal clamp for preventing pedestal level from changing. After that, for example, an analog video signal conforming to the so-called NTSC system is output. The moving image signal processing unit 20 includes a changeover switch 21 for switching and selecting the image signal from the camera process circuit 14 or the still image signal processing unit 30, and an image signal (digital signal) from the changeover switch 21. Digital / analog (hereinafter D
/ A) and a luminance signal of the video signal from the D / A converter 22 is FM-modulated by a predetermined carrier, the carrier chrominance signal is converted to a low frequency, and then the frequency is multiplexed to perform the above-mentioned head unit. 40, and performs various signal processing such as contour compensation on the video signal from the still image video signal processing unit 30 or the head unit 40 under the control of the control unit 50. Video processing circuit 23 that outputs a compliant video signal through terminal 24
It is composed of

The still image signal processing unit 30 performs signal processing such as data compression on one field or one frame of the image signal from the camera unit 10 as necessary, and also executes the data compression of the image signal. The control unit 5
An ID based on camera information such as the aperture of the lens from 0 is added and supplied to the head unit 40. Conversely, the head unit 4
The video signal reproduced at 0 is subjected to signal processing such as data decompression processing and supplied to the moving image video signal processing unit 20, and an ID is reproduced and supplied to the control unit 50. The still image signal processing unit 30 includes, for example, a video RAM 32 that stores the image signal from the camera process circuit 14 or the head unit 40 for one field or one frame, and a video signal read from the video RAM 32, for example. Data compression processing such as so-called adaptive dynamic range coding (ADRC) and so-called sub-sampling (Sub Sampling) is performed under the control of the control unit 50 (hereinafter, the compressed video signal is compressed data). Conversely, a still image video processing circuit 31 for performing a data decompression process on the compressed data to reproduce a video signal, a RAM 34 for temporarily storing the compressed data, and a synchronization signal for the compressed data read from the RAM 34 , Error correction code, the control unit 50
Identification codes (hereinafter referred to as ID ₁ , ID ₂ , I ₂₎ indicating values of the lens aperture, shutter speed, AGC gain, etc.
D ₃ ,...) (Hereinafter, the compressed data to which the ID and the like are added is referred to as still image data). On the other hand, the still image data is subjected to error correction processing and supplied to the RAM 34. ID ₁ from the data, ID _2, ID
₃ reproduces the ... composed of supplying PCM processing circuit 33 to the control unit 50.

The head section 40 records / reproduces a video signal obtained by photographing a subject by the camera section 10 as a moving picture video signal or a still picture video signal via the magnetic tape 1, ie, a recording medium. The analog video signal from the moving image video signal processing unit 20 and the digital video signal (still image data) from the still image video signal processing unit 30 are time-division multiplexed and The recording is performed in the video area and the PCM audio area, and the analog video signal and the still image data of the moving image are reproduced and supplied to the moving image signal processing unit 20 and the still image signal processing unit 30, respectively. The head unit 40 includes an analog video signal from the moving image video signal processing unit 20 and a still image video signal processing unit 3.
0 and time-division multiplexing of the still image data.
An MUX 41 for reproducing a moving image analog video signal and still image data from the F signal; an amplifier 43 for amplifying a time-division multiplexed recording signal from the MUX 41; an amplifier 44 for amplifying a reproduced RF signal; A changeover switch 42 for switching the amplifier 44 between recording and reproduction, and the magnetic tape 1 based on the exciting current from the amplifier 43.
And a rotary head 45 for reproducing the reproduced RF signal and supplying the reproduced RF signal to the amplifier 44.

The control section 50 controls the signal processing such as contour compensation of the moving picture video signal processing section 20 in a moving picture reproduction mode for reproducing a moving picture video signal so as to be optimal for the reproduction of a moving picture video signal. At the same time, in the still image reproduction mode for reproducing a video signal of a still image, the moving image video signal is generated based on the ID from the still image video signal processing unit 30, that is, the aperture of the lens at the time of shooting, the shutter speed, the gain of AGC, and the like. Various kinds of signal processing such as contour compensation of the processing unit 20 are controlled so as to be optimal for reproduction of a video signal of a still image. The control unit 50 operates the VTR, for example, a moving image shooting mode for recording a moving image signal, a moving image reproducing mode for reproducing a moving image signal, and a still image shooting mode for recording a still image signal. A function control circuit 51 for setting a reproduction mode of a still image for reproducing a video signal of a still image, and ID1 indicating a value of a lens aperture, a shutter speed, an AGC gain, and the like of the lens of the camera unit 10.
, ID2, ID3,...
3 and a system controller 52 for controlling various signal processing such as contour compensation of the moving picture video signal processing unit 20 based on ID1, ID2, ID3,... Reproduced from the PCM process circuit 33. The video RAM 32 is controlled by the system controller 52.
And the like, and a memory controller 55 for controlling addresses.

The magnetic tape 1 has the same tape format as the magnetic tape 80 shown in FIG. 4, for example. That is, a track formed obliquely on the magnetic tape 1 by the helical scanning of the rotary head 45 is divided into a video area and a PCM audio area, a moving image is recorded in the video area as an analog video signal, and a static image is recorded in the PCM audio area. Images are recorded as digital video signals.

Next, a VTR having the above-described configuration will be described.
Will be described. This VTR prevents a pedestal level serving as a reference for a black level and a contour compensation for compensating for insufficiency of a high frequency component of a spatial frequency of, for example, an optical system or an image sensor in a captured video signal. Performs various signal processing such as pedestal clamps, records video signals of moving images as analog signals in the video area of the magnetic tape 1, and converts video signals of still images into digital signals as PC signals.
In addition to recording in the M audio area, a video signal of a moving image or a video signal of a still image is reproduced from the magnetic tape 1, and the reproduced video signal is subjected to contour compensation for compensating for deterioration of high frequency components in a reproduction system. Various signal processing such as a pedestal clamp for preventing a pedestal level from changing is performed and output. Various kinds of signal processing such as contour compensation of the recording system, that is, characteristics of the camera process circuit 14 are preset so as to be optimal for recording a video signal of a moving image. Also, various signal processing such as contour compensation of the reproduction system, that is, the video processing circuit 2
The characteristic of 3 is controlled so as to be optimal for reproduction of a video signal of a moving image in a reproduction mode of a moving image, and in a reproduction mode of a still image, a lens aperture and a shutter recorded together with the video signal in a shooting mode of a still image. Control is performed so as to be optimal for reproducing a video signal of a still image based on an ID indicating a value such as a speed and an AGC gain.

Here, a description will be given of a moving image capturing mode in which a video signal of a moving image captured by the camera section 10 is recorded in a video area of the magnetic tape 1. In movie shooting mode,
After performing various kinds of signal processing such as contour compensation suitable for recording a video signal of a moving image on the video signal captured by the camera unit 10, the video signal is processed via the video signal processing unit 20 and the head unit 40. The data is recorded in the video area of the magnetic tape 1.

More specifically, the system controller 52
For example, when the function control circuit 51 sets the moving image shooting mode, the control signal corresponding to the setting is detected and each unit is controlled to operate in the moving image shooting mode. When a shutter (not shown) is operated, a shutter signal supplied through a terminal 54 is detected, and a video signal of a moving image is recorded on a video signal captured by the camera unit 10 while the shutter is operated. After performing various signal processing such as contour compensation suitable for the image processing, the moving image video signal processing unit 20 FM-modulates the luminance signal by a predetermined carrier, converts the carrier chrominance signal to a low frequency, and frequency-multiplexes the signal. Through the media area of the magnetic tape 1.

That is, the imaging signal from the CCD 11 is
In the S / H & AGC circuit 12 and the A / D converter 13, the signal is subjected to AGC, converted into a digital signal, and supplied to the camera process circuit 14. At this time, the S / H & AGC circuit 12 supplies the gain of the AGC and the like to the camera process circuit 14.

The camera process circuit 14 includes, for example, contour compensation, pedestal clamp, white clip, knee, and the like whose characteristics are preset in the video signal from the A / D converter 13 so as to be suitable for recording a video signal of a moving image. Signal processing such as gamma correction and black clipping is performed so as to match the properties of the subject. Specifically, for example, as shown in FIG. 2, for example, as shown in FIG. 2, when the AGC gain is low, the contour compensation gain is increased (contour compensation amount) based on the AGC gain determined by the brightness of the subject. And the sharpness is increased by reducing the so-called coring slice level. Conversely, when the AGC gain is high, the contour compensation gain is reduced (the contour compensation amount is reduced) and the coring slice is reduced. Increase the level to make the noise less noticeable. Also, for example, as shown in FIG. 3, the pedestal clamp, based on the gain of the AGC, suppresses noise near the black level by lowering the clamp level when the gain of the AGC is high and when the gain of the AGC is low. Increase the clamp level. That is, the characteristics of the camera process circuit 14 are preset so as to be optimal for recording a video signal of a moving image, and control the contour compensation and the pedestal clamp based on, for example, an AGC gain. .

The video signal subjected to signal processing such as contour compensation in the camera process circuit 14 as described above is
It is supplied to a D / A converter 22 via a changeover switch 21. The D / A converter 22 converts the digital video signal into an analog video signal and supplies the analog video signal to the video process circuit 23.

The video process circuit 23 FM-modulates the luminance signal of the video signal with a predetermined carrier, converts the carrier chrominance signal to a low frequency, multiplexes the frequency, and supplies the multiplexed signal to the rotary head 45 via the MUX 41 to the amplifier 43. I do. As a result, the video signal of the moving image is recorded in the video area of the magnetic tape 1. Further, the video process circuit 23 converts the video signal from the D / A converter 22 into a video signal conforming to, for example, the NTSC system, and sends it out to a monitor receiver via the terminal 24, for example. As a result, the image being photographed can be monitored.

Next, one frame or one field of the video signal photographed by the camera unit 10 is
A shooting mode of a still image to be recorded in the PCM audio area will be described. In the still image shooting mode, the CCD 1
After subjecting the video signal from 1 to signal processing such as contour compensation in the camera process circuit 14, the still image signal processing unit 30 performs signal processing such as data compression on one frame or one field of the video signal, The video signal subjected to the signal processing is recorded in the PCM audio area of the magnetic tape 1 via the head section 40, and the camera information from the camera section 10 is recorded as an ID in a predetermined area of the PCM audio area. Has become. In other words, in this VTR, the camera process circuit 14 that performs various signal processing such as contour compensation performed at the time of recording is shared between a moving image shooting mode and a still image shooting mode, and its characteristics are optimal for recording a moving image video signal. It is set to be.

More specifically, the system controller 52
For example, when the function control circuit 51 sets the still image shooting mode in the function control circuit 51, a control signal corresponding to the setting is detected, and each unit is controlled to operate in the still image shooting mode. When the shutter is operated, a shutter signal sent from the shutter via the terminal 54 is detected, and recording of a video signal of a still image is started.

That is, the imaging signal from the CCD 11 is
Similarly to the above-described moving image shooting mode, the S / H & AGC circuit 12 and the A / D converter 13 perform AGC and convert the digital signals into digital signals, which are supplied to the camera process circuit 14.

As in the above-described still image shooting mode, the camera process circuit 14 adds, to the video signal from the A / D converter 13, for example, contour compensation, which is set in advance so as to be suitable for recording a video signal of a moving image. Signal processing such as pedestal clamp, white clip, knee, gamma correction, and black clip is performed so as to be suitable for the properties of the subject.

The video signal subjected to signal processing such as contour compensation from the camera process circuit 14 is supplied to the video RAM 32 via the still image video process circuit 31. The video RAM 32 stores one frame or one field of the video signal based on the write address from the memory controller 53. The video signal for one field or one frame recorded in the video RAM 32 is sequentially read out from the memory controller 53 by a read address synchronized with, for example, data compression processing and the like, and is supplied to the still picture video processing circuit 31.

Under control of the system controller 52, the still picture video processing circuit 31 performs data compression processing by ADRC or sub-sampling on the sequentially read video signals as necessary, and the data compression is performed. The compressed video data, that is, the compressed data, is supplied to the RAM 34 via the PCM process circuit 33. And RAM3
4 temporarily stores the compressed data.

The PCM process circuit 33 includes a synchronizing signal, an error correction code, and camera information supplied from the system controller 52, that is, a lens aperture, a shutter speed, an AGC gain, etc. I that indicate the value of
D ₁ , ID ₂ , ID ₃ ,... Are added to generate still image data, and this still image data is supplied to the rotary head 45 via the MUX 41 to the amplifier 43. As a result, in the tens to hundreds of tracks in the PCM audio area of the magnetic tape 1,
A still image as a digital video signal, an ID indicating a lens aperture, a shutter speed, an AGC gain, and the like.
_1, ID _2, ID _3, is recorded with .... In addition, 1
The number of tracks required to record one still image depends on the data compression ratio.

On the other hand, the video process circuit 23 converts a video signal supplied from the camera process circuit 14 via the changeover switch 21 and the D / A converter 22 into a video signal compliant with, for example, the NTSC system, and connects the terminal 24 to the terminal 24. For example, to a monitor receiver. As a result, the image being photographed can be monitored.

Although the ID is recorded in the PCM audio area in the above description, it may be recorded in a so-called guard band between the video area and the PCM audio area, a so-called cue track, or the like. In addition, by simultaneously operating the moving image video signal processing unit 20 and the still image video signal processing unit 30 as necessary, in the above-described moving image shooting mode, the image shot while the moving image signal is being recorded is recorded. One frame or one field of the signal is recorded as a digital video signal of a still image in the PCM audio area of a track on which a video signal of a moving image is recorded, or a video signal of a still image is recorded in a still image shooting mode. The video signal captured during the recording may be recorded as an analog video signal of a moving image in a video area of a track on which a digital video signal of a still image is recorded.

Next, a description will be given of a moving image reproduction mode for reproducing a moving image signal from a magnetic tape in which the moving image signal is recorded in the video area. For example, when the function control circuit 51 sets the moving image playback mode, the system controller 52 detects a control signal corresponding to the setting and controls each unit to operate in the moving image playback mode.

Specifically, the system controller 52
Is used to reproduce various kinds of signal processing such as contour compensation for compensating for deterioration of high frequency components in a reproduction system provided in the video process circuit 23 and pedestal clamp for preventing a pedestal level from changing. Control as appropriate. That is, for example, the control of the gain of the contour compensation based on the gain of the AGC, the slice level of the coring, the clamp level of the pedestal clamp, etc. as shown in FIGS. I do.

An analog video signal of a moving image reproduced from the video area of the magnetic tape 1 by the head unit 40 is supplied to the video process circuit 23 controlled as described above. The video process circuit 23 performs various kinds of signal processing on the video signal, for example, signal processing such as contour compensation for compensating for deterioration of a high-frequency component in a reproduction system, and converts the processed video signal into an NTSC signal. After being converted into a video signal, it is transmitted to a monitor receiver via a terminal 24. As a result, a moving image is displayed on the screen of the monitor receiver. In this case, the video signal recorded by performing various kinds of signal processing such as contour compensation suitable for recording the video signal of the moving image in the moving image shooting mode is converted into the video signal of the moving image in the moving image playback mode. Various signal processing such as contour compensation suitable for reproduction is performed and reproduced. That is, for example, a video signal of a moving image in which sharpness and S / N are balanced is reproduced.

Next, a description will be given of a still picture reproduction mode for reproducing a still picture video signal from a magnetic tape in which a still picture video signal is recorded together with an ID based on camera information in the above-described still picture shooting mode. . For example, when the function control circuit 51 sets the still image reproduction mode in the function control circuit 51, the system controller 52 detects a control signal corresponding to the setting and controls each unit to operate in the still image reproduction mode.

Specifically, the PCM process circuit 33
From the PCM audio area of the magnetic tape 1 to the head unit 40
Error correction processing is performed on the still image data reproduced by the above, and the synchronization signals, ID ₁ , ID ₂ , ID ₃ , etc. are separated and detected. The detected ID ₁ , ID ₂ , ID
_3, ... are supplied to the system controller 52, the compressed data error-corrected is temporarily stored in the RAM 34. Then, the compressed data read from the RAM 34 is supplied to the still image video processing circuit 31.

The still picture video processing circuit 31 performs ADRC decoding processing and interpolation processing on the compressed data to reproduce a video signal. The reproduced video signal is stored in the video RAM 32
Supplied to

The video RAM 32 stores a video signal based on a write address from the memory controller 53. Then, when the video signal is stored for one field or one frame, the video RAM 32 repeatedly reads the one field or one frame of the video signal recorded based on the read address from the memory controller 53. The data is supplied to a video processing circuit 23 via a D / A converter 22.

On the other hand, the system controller 52
ID ₁ , ID ₂ , I supplied from the M process circuit 33
Based on D ₃ ,..., Signal processing such as contour compensation of the video process circuit 23 is controlled so as to be suitable for reproduction of a still image video signal. That is, for example, the contour compensation gain based on the AGC gain as shown in FIGS.
The control of the coring slice level, the pedestal clamp level, and the like is controlled so as to be suitable for reproducing a still image video signal.

The video processing circuit 23 in which the characteristics of the various signal processings are controlled as described above is applied to the video signal from the D / A converter 22 to perform signal processing such as contour compensation suitable for reproducing a still image video signal. And converts the signal-processed video signal into a video signal compliant with, for example, the NTSC system, and then sends it out to, for example, a monitor receiver via the terminal 24. As a result, a still image is displayed on the screen of the monitor receiver. In this case, the characteristics of various kinds of signal processing such as contour compensation of the video process circuit 23 are controlled so as to be suitable for reproducing a video signal of a still image. The video signal of the picture is reproduced.

For example, if the VTR has a so-called shutter priority, aperture (iris) priority, or full auto function, and the AGC gain is automatically adjusted, and the gain value cannot be specified, the following equation is used. Used to calculate the gain. (Total exposure) = (Iris exposure) + (Shutter speed exposure) + (AGC gain) = Constant

As is clear from the above description, in the present embodiment, in the still image shooting mode, the video signal of the still image is converted into the camera information such as the lens aperture, the shutter speed, and the like.
It is recorded together with an ID indicating a value such as an AGC gain. At the time of reproducing the video signal of the moving image, the characteristics of various signal processing such as contour compensation of the video process circuit 23 are controlled so as to be suitable for reproducing the video signal of the moving image. At this time, by controlling characteristics of various signal processing such as contour compensation of the video process circuit 23 based on the ID so as to be suitable for reproduction of a video signal of a still image, reproduction of a video signal of a moving image and reproduction of a still image are performed. It is possible to reproduce a video signal that has been subjected to various signal processing such as contour compensation suitable for reproducing the video signal. In other words, the video process circuit 23 can be used in both the moving image playback mode and the still image playback mode, so that the number of components can be reduced and the cost can be reduced.

The present invention is not limited to the above embodiment. For example, a so-called deep recording method in which a recording area is divided in the thickness direction of a magnetic tape is adopted, and an analog video signal and a digital signal are It goes without saying that the present invention can be applied to a video tape recorder or the like which can record analog video signals and digital signals recorded in the respective areas and reproduce the recorded analog video signals and digital signals.

[0047]

As is apparent from the above description, according to the present invention, when a video signal obtained by photographing a subject is recorded on a recording medium as a video signal of a still image, for example, a lens aperture, a shutter speed, Camera information such as AGC gain is recorded. When a video signal of a moving image is reproduced, various signal processing characteristics such as contour compensation are controlled so as to be suitable for reproduction of the video signal of a moving image. When a video signal of a still image is reproduced, various characteristics such as contour compensation are controlled. Control of the signal processing characteristics of the video signal of the still image based on the camera information so that it is suitable for the reproduction of the video signal of the moving image and the video signal of the still image. Can be reproduced. That is, a circuit for performing various signal processing such as contour compensation can be shared for the reproduction of a video signal of a moving image and the reproduction of a video signal of a still image, so that the number of parts can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a circuit configuration of a camera-integrated 8 mm video tape recorder to which the present invention is applied.

FIG. 2 is a diagram illustrating characteristics of a gain of contour compensation and a slice level of coring with respect to a gain of AGC for explaining a principle of contour compensation.

FIG. 3A is a diagram illustrating the principle of a pedestal clamp.
FIG. 7 is a diagram illustrating characteristics of a clamp level with respect to a gain of GC.

FIG. 4 is a diagram showing a tape format of a magnetic tape used in an 8 mm video tape recorder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnetic tape 10 ... Camera part 20 ... Video image signal processing part 23 ... Video process circuit 30 ... Still image video signal processing part 33 ... PCM process circuit 40 ... Head Part 52: System controller

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI H04N 5/765 H04N 5/782 K (58) Investigated field (Int.Cl. ⁷ , DB name) H04N 5/222-5 / 257 H04N 5/76 H04N 5/78-5/907 H04N 5/91-5/956 H04N 9/79-9/898

Claims (1)

(57) [Claims] 1. A video signal obtained by photographing a subject by a camera unit as a moving image video signal or a still image video signal.
A video signal recording / reproducing apparatus for recording / reproducing via a recording medium by a recording / reproducing means, comprising: a video shooting mode for recording a video signal of a video; a video playback mode for reproducing a video signal of a video; A control unit for setting a still image shooting mode for recording a video signal, a still image playback mode for reproducing a still image video signal, and outputting camera information indicating an imaging condition set in the camera unit; In the shooting mode, the video signal from the camera unit is subjected to signal processing and supplied to the recording / reproducing means as a moving image video signal.
A moving image signal processing unit for performing signal processing on a moving image signal reproduced from a recording medium by a reproducing unit and outputting the processed signal; and in a still image shooting mode, performing a signal processing on the image signal from the camera unit to generate a still image image. The still image video signal is supplied to the recording / reproducing unit together with the camera information supplied from the control unit as a signal. In the still image reproduction mode, the recording / reproducing unit reproduces the camera information from the recording medium together with the camera information. A still image video signal processing unit that performs signal processing on the still image video signal to be supplied to the moving image video signal processing unit, and supplies camera information reproduced from the recording medium to the control unit. The control unit, in a still image reproduction mode, performs a signal processing performed by the moving image signal processing unit on the still image signal supplied from the still image signal processing unit. The video signal recording and reproducing apparatus and controls based on the camera information.