JP3166306B2 - Image reproducing apparatus and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of playback modes.
The present invention relates to an image reproducing apparatus having the same and a method thereof .

[0002]

2. Description of the Related Art In the special reproduction of a video signal recorded on a video tape, a conventional video reproducing apparatus outputs a reproduced video signal by superimposing a pseudo vertical and horizontal synchronizing signal. FIG. 2 shows a schematic block diagram of a conventional helical scan type video reproducing apparatus. FIG. 2 will be described in detail. In the conventional video reproducing apparatus 10, reference numeral 12 denotes a magnetic tape on which a video signal is recorded by a helical scan method, which is wound around a rotary drum 14 over a predetermined angle. The rotating drum 14 is rotated by a drum motor 16, and the circumferential surface of the rotating drum 14 has two azimuth angles different from each other.
One reproducing head 18a, 18b is attached.
The magnetic tape 12 is transported by the capstan motor 20 in the positive and negative directions.

A system control circuit 22 controls the number of rotations of a drum motor 16 and a capstan motor 20 according to a reproduction mode signal from an input terminal 24,
The switch 26 is switched in synchronization with the rotation of the rotating drum 14 to select the output of the reproducing heads 18a and 18b. The reproduction head output selected by the switch 26 is reproduced by a reproduction processing circuit 28. That is, the reproduction processing circuit 28 outputs a reproduced video signal.

At the time of special reproduction, the synchronization signal superimposed on the reproduced video signal output from the reproduction processing circuit 28 is missing or unstable. A signal and a pseudo vertical synchronizing signal are generated and added to the output of the reproduction processing circuit 28 by the adder 32. The output of the adder 32 becomes the output of the reproducing apparatus 10 and is applied to the monitor 34.

FIG. 3 shows the head trajectory at the time of reproduction at 7 × speed in the forward direction.
Shown in In FIG. 3, + is a plus azimuth track, −
Is a minus azimuth track, for example, the head 18a moves from A to B. At a forward speed of seven times, the system control circuit 22 rotates the capstan motor 20 at seven times the normal speed and rotates the drum motor 16 at a predetermined relative speed.

Since the head 18a is a plus azimuth head, a minus azimuth track cannot be reproduced, and a reproduced signal cannot be obtained in the areas a, b and c of FIG. As a result, noise bars 36a, 36b, 36c appear on the monitor screen as shown in FIG. Noise bar 36
a, 36b, and 36c are due to the inability to reproduce in areas a, b, and c, respectively.

[0007]

The aspect ratio of a conventional television signal is 3: 4, but 9:16 is adopted for a high-definition television signal. A monitor that converts a Hi-Vision signal into the NTSC format and displays an image on a horizontally long screen with an aspect ratio of 9:16 while complying with the NTSC format, a so-called wide monitor, is also commercially available.

It is convenient to superimpose an identification signal indicating whether the aspect ratio is 3: 4 or 9:16 on the video signal so that the aspect ratio can be automatically determined inside the monitor. Therefore, for example, a method has been proposed in which digital information relating to an aspect ratio (hereinafter, referred to as an aspect ID) is superimposed on the 20th line and the 283rd line in the vertical blanking period. FIG. 4 shows a waveform diagram of the aspect ID. In this way, for example, video tape
This aspect ID is saved even when recorded and reproduced by a recorder (VTR), which is convenient.

However, in the conventional video reproducing apparatus, when the video data is reproduced at a speed different from the recording speed (for example, high-speed search reproduction, slow reproduction, still image reproduction, etc.), this aspect I
A field where D cannot be reproduced may occur. For example, if the recording portion of the aspect ID is traced by a head having an azimuth different from the recording track, the aspect ID cannot be reproduced. Then, the playback video signal output
As a result, the aspect ID is missing, and the monitor understands the image signal as a normal image signal having an aspect ratio of 3: 4 and displays an image on a screen having an aspect ratio of 3: 4. That is, the image is compressed in the horizontal direction.

[0010] The present invention provides an image which solves such a disadvantage.
An object of the present invention is to provide an image reproducing apparatus and a method thereof.

[0011]

An image reproducing apparatus according to the present invention has a plurality of types of reproduction modes, and is recorded on a recording medium.
Reproducing means for reproducing the reproduced image signal;
Detection of the aspect ratio of the image signal reproduced by
Output means and an aspect detected by the detection means
Storage means for storing aspect ratio data indicating a ratio;
Aspect ratio data stored in the storage means and the detection
The aspect ratio data detected by the
Output means for selectively outputting according to the reproduction mode of the raw means
And characterized in that:

[0012] The image reproducing method according to the present invention comprises a plurality of types of reproduction.
It has a raw mode and plays back image signals recorded on a recording medium
Playing step, and the image to be played back in the playing step.
A detecting step of detecting an aspect ratio of an image signal;
Aspect indicating the aspect ratio detected in the detection step
Storing the ratio data in a storage medium;
The aspect ratio data stored in the storage medium and the detection
The aspect ratio data detected in the step
Output step for selectively outputting according to the mode.
It is characterized by the following.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of an embodiment of the present invention. In FIG. 1, reference numeral 40 denotes a video reproducing apparatus according to one embodiment of the present invention, and 42 denotes a magnetic tape on which a video signal is recorded by a helical scanning method. Of course,
When the aspect ratio is not 3: 4, the aspect ID is superimposed on the video signal recorded on the magnetic tape 42 at the above-mentioned predetermined timing.

44 is a rotating drum, 46 is a rotating drum 44
And a capstan motor 48 for transporting the magnetic tape 42. The rotating drum 44 has two reproducing heads 50a and 50b having different azimuths.
Is attached. The reproducing head 50a has plus azimuth and the reproducing head 50b has minus azimuth. A switch 52 selects the output of the reproducing heads 50a and 50b in synchronization with the rotation of the rotary drum 44.

Numeral 54 denotes a reproduction processing circuit for reproducing the output of the reproduction heads 50a and 50b inputted through the switch 52 and outputting a reproduced video signal, and 56 a pseudo synchronization signal for generating a pseudo horizontal synchronization signal and a pseudo vertical synchronization signal. Signal generation circuit,
58 is an adder that superimposes the output (pseudo-synchronous signal) of the pseudo-synchronous signal generation circuit 56 on the output (reproduced video signal) of the reproduction processing circuit 54, and 60 is the recording timing portion of the aspect ID Is an ID removing circuit for removing the signal of Reference numeral 62 denotes a switch for selecting the output (contact a) of the reproduction processing circuit 54 or the output (contact b) of the ID removing circuit 60.

Reference numeral 64 denotes an ID detection circuit for detecting an aspect ID from the output video signal of the switch 62; 66, a system control circuit for controlling the whole; 68, an ID memory for temporarily storing the detected aspect ID of the reproduced video signal; 70
Is an ID generation circuit that generates an aspect ID signal at a predetermined timing according to an instruction from the system control circuit 66;
Reference numeral 72 denotes an ID generation circuit 7
This is an adder for superimposing the output (aspect ID) of No. 2.
The output of the adder 72 is the output of the video playback device 40.
Reference numeral 74 denotes a mode signal input terminal for specifying an operation mode of the system control circuit 66.

Reference numeral 76 denotes a monitor provided with a screen having an aspect ratio of 9:16.

In this embodiment, it is assumed that a video signal having an aspect ratio of 9:16 is recorded on the magnetic tape 42.
An image having an aspect ratio of 9:16 is converted into a video signal in a state where it is optically or electronically compressed (reduced) to 3/4 in the horizontal direction, and is a so-called squeeze signal.

FIG. 5 is a flow chart schematically showing the operation of the present embodiment during normal reproduction and search reproduction.

When a mode signal instructing the normal reproduction mode is input from the input terminal 74 to the system control circuit 66,
The system control circuit 66 enters the normal reproduction mode (S
1), drum motor 46 and capstan motor 4
8 is rotated at a predetermined speed (S2), and the switch 52 is alternately turned on in synchronization with the rotation phase of the rotary drum 44.
a or 50b (S3). Of course, the switch 52 is controlled so as to select the reproducing head 50a or 50b that matches the azimuth of the reproducing track on the magnetic tape 42.

The output of the switch 52 is input to a reproduction processing circuit 54. The reproduction processing circuit 54 executes a known reproduction process such as demodulation and outputs a reproduced video signal. In the normal reproduction mode, the system control circuit 66 connects the switch 62 to the contact a, and the output of the reproduction processing circuit 54
Is applied to the ID detection circuit 64 and the adder 72. The ID detection circuit 64 detects an aspect ID superimposed on the reproduced video signal.

In the normal reproduction mode, the aspect ID portion of the recorded video signal is also correctly reproduced by the magnetic heads 50a and 50b, and can be detected by the ID detection circuit 64.
The ID detection circuit 64 outputs the detected aspect ID to the system control circuit 66. Of course, aspect ratio 3: 4
In the case of the video, the aspect ID is not particularly superimposed. Therefore, when the aspect ID cannot be detected, the ID detection circuit 64 outputs an ID indicating the aspect ratio of 3: 4 to the system control circuit 66. The system control circuit 66
The ID from the D detection circuit 64 is stored in the ID memory 68. The ID memory 68 stores only the latest ID from the system control circuit 66.

The reproduced video signal in the normal reproduction mode has an appropriate format for both the vertical synchronizing signal and the horizontal synchronizing signal, and the aspect ID has an appropriate timing when superimposed. Therefore, the ID generation circuit 7
It is not necessary to generate an aspect ID signal from 0. That is, the reproduced video signal output from the switch 62 passes through the adder 72 and is applied to the monitor 76.

The monitor 76 checks the aspect ID of the reproduced video signal from the video reproducing apparatus 40. If the aspect ID does not exist, the monitor 76 displays an image on a screen having an aspect ratio of 3: 4. At 9:16), an image is displayed.

Next, the operation in the forward direction 7 × speed search mode will be described. From the input terminal 74 to the system control circuit 66
The system control circuit 66 supplies the mode signal of the forward direction 7 × speed search mode to the
Control is performed in the double speed search mode (S10). That is, at 7 times the normal speed, the system control circuit 66
The motor 48 is rotated at 7 times the normal speed, and the drum motor 4 is rotated.
6 is rotated at a predetermined relative speed.

FIG. 6 shows the trajectory of the head in the normal direction at 7 × speed reproduction in this embodiment. FIG. 3 showing a conventional head trajectory
Similarly, + indicates a plus azimuth track, and − indicates a minus azimuth track.
a moves from A to B. Since the head 18a is a plus azimuth head, a minus azimuth track cannot be reproduced, and a reproduced signal cannot be obtained in the areas a, b, and c in FIG. 5, as in FIG. As a result, FIG. 1 is displayed on the monitor screen.
The noise bars 78a, 78b, 78c appear as shown in FIG. The noise bars 78a, 78b and 78c are due to the inability to reproduce in the areas a, b and c, respectively.

In FIG. 5, reference numerals 80 and 82 denote a minus azimuth track and a plus azimuth track, respectively.
This indicates the recording position of the track's aspect ID. The reproducing head 50a can reproduce the aspect ID 80, but cannot reproduce the aspect ID 82 because the azimuth is different. Considering tracking blur, the reproduced aspect ID also becomes unstable.

Therefore, in the present embodiment, the switch 62 is set to b
Connected to the contact side (S13), the ID memory 6
ID generation circuit 7 using the aspect ID stored in
A corresponding aspect ID signal is generated from 0, and is superimposed on the reproduced video signal by the adder 72 (S14). The details will be described below.

The reproduction processing circuit 54 reproduces the output of the reproducing head 50a or 50b and outputs a reproduced video signal. As described above, the aspect ID to be superimposed on the reproduced video signal is missing or unstable. The pseudo synchronizing signal generation circuit 56 generates a pseudo horizontal synchronizing signal and a pseudo vertical synchronizing signal, and an adder 58 adds these to the output (reproduction video signal) of the reproduction processing circuit 54. ID
The elimination circuit 60 clamps the 20th and 283rd lines in the vertical blanking period of the output video signal of the adder 58 to the pedestal level to eliminate the unstable aspect ID.

The video signal from which the aspect ID has been removed by the ID removing circuit 60 is supplied to the adder 72 via the switch 62.
Is applied to The system control circuit 66 reads out the aspect ID stored in the ID memory 68 at the time of normal reproduction, and transfers it to the ID generation circuit 70. ID generation circuit 70
Generates a corresponding aspect ID signal at a predetermined timing. The adder 72 adds the I signal to the video signal from the switch 62.
The aspect ID signal from the D generation circuit 70 is superimposed.

Thus, the video reproducing apparatus 40 outputs a video signal on which a stable aspect ID is superimposed.
Therefore, the monitor 76 can correctly detect the aspect ID superimposed on the video signal from the video playback device 40, and displays the special playback video on a horizontally long screen.

The above description has been made with respect to the example of normal speed 7 × speed reproduction, but the same applies to other special reproductions in which a recording head is traversed by a reproduction head. For example, reverse playback, reverse search, frame-by-frame playback, still image playback, slow playback, and the like. FIG. 7 shows a head trajectory in the case of reproducing a still image.

Although the embodiment in which the magnetic tape is used as the recording medium has been described, the present invention is applied to a recording medium which is difficult to randomly access, such as an optical disk, a magnetic disk, a magneto-optical disk, and a certain solid-state memory device. The present invention can be applied to general devices for reproducing video signals.

The signal for designating the aspect ratio is not limited to the above-mentioned aspect ID, and it goes without saying that other signal formats and / or timings may be used.

As can be easily understood from the above description, according to the present invention , the original astigmatism can be obtained in various playback modes.
Since it is possible to obtain data on the spect ratio,
Images can be reproduced with the original aspect ratio even during playback
it can.

[Brief description of the drawings]

FIG. 1 is a system configuration block diagram of a first embodiment of the present invention.

FIG. 2 is a configuration block diagram of a conventional example.

FIG. 3 is a head locus at the time of normal-direction 7 × speed reproduction in a conventional example.

FIG. 4 is a signal waveform diagram of an aspect ID.

FIG. 5 is an operation flowchart of the embodiment.

FIG. 6 is a head locus at the time of normal-speed 7 × speed reproduction in the present embodiment.

FIG. 7 is a head locus at the time of reproducing a still image according to the present embodiment.

[Explanation of symbols]

10: Video playback device 12: Magnetic tape 14: Rotating drum 16: Drum motor 18a, 18b: Reproduction head 20: Capstan motor 22: System control circuit 24: Input terminal 26: Switch 28: Reproduction processing circuit 30: Simulated Synchronous signal generation circuit 32: Adder 34: Monitor 36a, 36b, 36c: Noise bar 40: Video playback device 42: Magnetic tape 44: Rotating drum 46: Drum motor 48: Capstan motor
50a, 50b: reproduction head 52: switch 54:
Reproduction processing circuit 56: pseudo synchronizing signal generation circuit 58: adder 60: ID removal circuit 62: switch 64: I
D detection circuit 66: system control circuit 68: ID memory 70: ID generation circuit 72: adder 74: mode signal input terminal 76: monitor 80, 8
2: Aspect ID

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Takimoto 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Taizo Hori 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Hiroyuki Fukuoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Yoshihiro Nakatani 3-30-2, Shimomaruko 3-chome, Ota-ku, Tokyo Canon Inc. ( 56) References JP-A-5-284452 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/91-5/956 H04N 5/782-5/783

Claims (6)

(57) [Claims] (1)It has multiple playback modes,
Reproducing means for reproducing the recorded image signal; Aspect of the image signal reproduced by the reproducing means
Detecting means for detecting the An indicator indicating the aspect ratio detected by the detection means.
Storage means for storing spectrum ratio data; The aspect ratio data stored in the storage means and the detection
And the aspect ratio data detected by the output means.
Output means for selectively outputting according to the playback mode of the playback means
With steps An image reproducing apparatus characterized by the above-mentioned. 2. The apparatus according to claim 1, further comprising :
Display means for displaying an image signal, wherein the display means
To the aspect ratio data output by the output means
2. The image reproducing apparatus according to claim 1, further comprising control means for controlling display processing according to the information . 3. The apparatus according to claim 1, further comprising:
Aspect output by the output means to the image signal
3. The method according to claim 1, further comprising an adding unit for adding ratio data.
The image reproducing apparatus according to any one of the preceding claims. 4. An image signal reproduced by said reproducing means.
The aspect ratio data is added to the signal
The image reproducing device according to any one of claims 1 to 3. 5. The storage device according to claim 1, wherein the reproduction mode is a normal mode.
Detected by the detection means when in the playback mode.
The output means stores the reproduced aspect ratio data.
When the raw mode is the special playback mode,
Outputting the stored aspect ratio data.
5. The image reproducing device according to any one of 4. 6. A recording medium having a plurality of types of reproduction modes.
A playback step of playing back the recorded image signal; Aspect ratio of the image signal reproduced in the reproducing step
A detecting step of detecting Aspects indicating the aspect ratio detected in the detection step
Stores the spect ratio data A storage step for storing on a medium; The aspect ratio data stored in the storage medium and the detection
The aspect ratio data detected in the output step
Output step for selectively outputting according to the raw mode.
An image reproducing method, comprising: