JPS63146581A - Still picture photographing and reproducing system - Google Patents

Abstract

PURPOSE:To obtain a still picture with high picture definition by photographing a still picture obtaining a video signal by 2 field by the exposure executed once per one frame period and reproducing the video signal by 2 fields alternately and repetitively at every field. CONSTITUTION:The still picture photographing obtaining video signals S1, S2 by 2 fields is applied by the exposure executed once during one frame period and the video signals S1, S2 by 2 fields are reproduced alternately repetitively at every field to apply picture reproduction. Since the video signals S1, S2 for 2 fields are obtained by one exposure, even when the video signals S1, S2 by 2 fields obtained by photographing a moving object are reproduced based on the interlace system, no fogging is caused in the still picture. Moreover, since one still picture is constituted by the video signals S1, S2 by one frame, the deterioration in the vertical resolution is not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a still image photographing and reproducing method, and in particular to extracting only the advantages of field still reproducing and frame still reproducing to perform good still image reproducing. This invention relates to a still image shooting and playback method.

(Prior Art) For example, in the still image reproduction method of a conventional helical scanning type video tape recorder (VTR), two consecutive
Frame still playback that plays fields alternately,
There is field still playback in which only one film is played repeatedly. Here, FIG. 4 shows a plan view of the rotary head drum.

In the figure, the rotary head drum 1 is rotating together with the rotating shaft 2 in the direction of the arrow. In addition, rotating video heads 3a and 3b having different azimuth angles are attached to the rotating head drum 1, facing each other by 180 degrees, and a special rotating video head 3a and 3b having the same azimuth angle as the rotating video head 3a used during still playback is also installed. A rotating video head 3C for reproduction is mounted at a position substantially opposite to the rotating video head 3a.

In the above configuration, during recording, as shown in FIG. 5 or 6, the rotating video heads 3a and 3b alternately record images on the magnetic tape 4, such as video tracks 5a and 5b, which are being scanned in the direction of the arrow B. For example, a video signal consisting of a frequency modulated (FM) Ii degree signal and a low-frequency conversion carrier color signal was recorded.

When the frame still reproduction is performed on the magnetic tape 4 on which the video signal has been recorded, the running of the magnetic tape 4 is stopped, but the rotary head drum 1 rotates, as shown in FIG.
Rotating video heads 3a and 3b each having a different azimuth angle
alternately scan the broken line portion 6 in the direction of arrow C. In this case, rotating video heads 3a and 3b reproduce half of video track 5a and half of video track 5b, respectively.

In this way, two consecutive fields, ie, one frame, are repeatedly reproduced.

On the other hand, in the case of field still playback, as shown in FIG.
C alternately scans the broken line portion 7 in the direction of arrow C. In this case, since both rotating video heads 3a and 3C reproduce only the video track 5a, one field is repeatedly reproduced.

(Problem to be Solved by the Invention) However, when an attempt is made to reproduce a fast-moving image using the frame still reproduction described above, for example, there is a large difference in information contained in the two fields of video signals to be reproduced, so that the reproduced image becomes This will cause blurring.

Furthermore, although field still reproduction does not cause blurring in the reproduced image as described above, it generally has problems such as its vertical resolution being degraded compared to the frame still reproduction.

(Means for Solving the Problems of the Invention) The present invention has been made in view of the above-mentioned circumstances,
An object of the present invention is to provide a still image photographing and reproducing method that can realize good still image photographing and reproducing without deteriorating image quality.

In order to achieve this object, the present invention performs still image shooting to obtain a video signal S1°82 for two fields by exposure performed once in one frame period as shown in FIG. Video signal of 81.82
This invention provides a still image photographing and reproducing method characterized in that still images are reproduced by alternately and repeatedly reproducing each field.

(Function) In the still image shooting and playback method as described above, as shown in Fig. 1, in order to obtain video signals S1 and S2 for two fields in one exposure, these signals obtained by photographing a moving subject are used. Even when the video signals S1 and 82 for two fields are reproduced based on the interlace method, no blurring occurs in the still image.

Furthermore, one still image corresponds to one frame of video signal S1,
82, problems such as deterioration of vertical resolution do not occur.

Therefore, according to the still image photographing and reproducing method according to the present invention, a still image with good image quality can be obtained.

(Embodiments) Hereinafter, preferred embodiments according to the present invention will be described in detail using FIGS. 1 to 3.

FIG. 2 is a block diagram showing a still image photographing and reproducing device for realizing the still image reproducing method according to the present invention.
and normal display equipment 20.

The television camera 10 includes a general image pickup tube 11, a camera circuit 12, and a deflection circuit 13. Synchronized horizontal deflection current SH and normal vertical synchronization signal (e.g. 60 [H2]
) is supplied to the horizontal and vertical deflection coils 14 and 15, respectively, to change the electron beam and take out a photographing signal from the image pickup tube 11, and further in the camera circuit 12, for example, the NTSC system. The output terminal 16 outputs video signals S1 and 82 such as composite signals based on the above.

Further, this television camera 10 has the above-mentioned image pickup tube 11.
It is provided with a shutter 17 for exposing the camera with imaging light, and this shutter 17 is driven and controlled by a shutter 1 operation circuit 18.

This shutter drive circuit 18 is connected to the deflection circuit 1 described above.
In synchronization with a vertical synchronizing signal (V, 5ynC) supplied from 3, the shutter 17 is opened only once in one frame period to perform exposure, as shown in FIG.

In the television camera 10 as described above, the image signals S1 and S2 are obtained by accumulating charges in the Nesa film of the image pickup tube 11 through one exposure and extracting them by horizontal and vertical scanning for two fields.

Therefore, according to this television camera 10, for example, 525 horizontal scanning lines worth of video signals, ie, 2 fields worth of video signals 51.82, are extracted by one exposure per frame period, as shown in FIG.

Then, the two fields of video signals 81 and 82 extracted in this way are transmitted by the display device 20 into two fields having a time difference of 1/60 seconds each in an interlaced format similar to a normal television signal. is played.

Here, a still image is reproduced by alternately and repeatedly reproducing two fields of video signals 81 and 82 obtained by one exposure for each field.

On the other hand, normal playback can be performed by sequentially continuing the exposures performed once per frame period and sequentially playing back the video signals obtained by each exposure.

Note that in order to alternately and repeatedly reproduce two fields worth of video signals 81 and 82, two field memories are provided in the display device 20, as is generally known, and the video signals S+, S+, and S+ are stored in these field memories. S2
may be stored respectively, and the stored video signals 81 and 82 may be read out and reproduced alternately and repeatedly field by field.

Further, the display device 20 is provided with a frame memory, and the video signals 81.82 are recorded in the frame memory, and the horizontal deflection period is halved and the video signals 81.82 are simultaneously reproduced using a non-interlace method. Good too.

Next, another embodiment of a still image photographing and reproducing apparatus for realizing the still image photographing and reproducing method according to the present invention will be described. In addition,
For convenience of explanation, the same parts as in the previous embodiment are given the same reference numerals and the explanation will be omitted.

As shown in FIG. 3, the television camera 30 in this embodiment includes a distributor 32 that distributes the imaging signal output from the image carrier tube 31 into odd-numbered scanning lines and even-numbered scanning lines, and It is provided with two field memories 33 and 34, each of which stores an imaging signal for an even-numbered scanning line and an imaging signal for an even-numbered scanning line.

Further, in this television camera 30, the normal horizontal synchronizing signal (H, 5
An electron beam is generated by a horizontal deflection N current 521-1 synchronized with the same synchronization signal of twice the frequency (31.5 [KHz]) of VnC) and a vertical deflection current Sv synchronized with the normal vertical synchronization signal (V, 5ync). is scanned.

Therefore, according to this television camera 30, Ifi image signals for, for example, 525 horizontal scanning lines can be obtained by one scan of one field period.

Therefore, each of the field memories 33 and 34 stores video signals for one field, that is, video signals S+ and S2 for 262.5 horizontal scanning lines.

Also in this television camera 30, exposure is performed once per frame period by the shutter drive circuit 18 similar to the previous embodiment.

Therefore, in this embodiment as well, two fields worth of video signals 81 .
82 can be obtained.

The distributor 32 distributes the image signal to each field memory 3 in synchronization with a clock C1 having twice the frequency of the normal horizontal synchronizing signal supplied from the clock generator 36.
3. Distribute to 34.

Further, each of the field memories 33 and 34 is read and read out by a memory controller 37 whose timing is controlled by a clock C1 having twice the frequency of a normal horizontal synchronizing signal and a clock C2 synchronized with a normal vertical synchronizing signal. It's about to be controlled.

Also in this embodiment, the video signal Sl for two fields as shown in FIG. 1 obtained through the output terminal 16 is
, 82 on a display device, it is possible to perform still image reproduction and normal reproduction.

Here, especially when performing still image playback, two fields worth of video signal 81.82 obtained by one exposure are used.
Since one still image is reproduced at , it is possible to obtain a still image without image blur or deterioration in vertical resolution.

(Effects of the Invention) As is clear from the above description, the present invention performs still image transfer to obtain two fields' worth of video signals by exposure performed once in one frame period, and transfers these two fields' worth of video signals. Since still images are reproduced by alternately and repeatedly reproducing each field, it is possible to reproduce still images with good image quality.

[Brief explanation of the drawing]

FIG. 1 is a time chart showing the relationship between exposure and video signals in the present invention, FIG. 2 is a block diagram showing an embodiment for realizing the present invention, and FIG. 3 is a block diagram showing another embodiment. , FIG. 4 is a plan view of a general rotary head drum, and FIGS. 5 and 6 are tape format diagrams showing the operation of the rotary video head during frame still playback and field still playback, respectively. 10.30...Television camera, 11.31...
- Image pickup tube, 17... shutter, 18... shutter drive circuit, 20... display device. Figure 7 α @ZM

Claims (1)

[Scope of Claims] Still image shooting is performed to obtain two fields of video signals through exposure performed once in one frame period, and these two fields of video signals are alternately and repeatedly reproduced field by field. A still image shooting and playback method characterized in that still images are played back using the following methods.