JPS63146587A - Still picture reproducing system - Google Patents

Abstract

PURPOSE:To attain a still picture reproduction with excellent picture quality by reproducing an interpolation video signal or other one field alternately and repetitively at every field by the interpolation based on the non-interlace system from a video signal by 1 field supplied sequentially at every other field period. CONSTITUTION:The interpolated video signal is generated by the interpolation based on the non-interlace system from the video signal. That is, the video signal S1 of a prescribed field is reproduced as it is in a 1st field and the interpolated video signal S2 in a blank period by one field succeeding to the 1st field, that is, a 2nd field. Then the video signal S1 is reproduced in an odd number field and the interpolation video signal S2 is reproduced in an even number field. Thus, the image based on the video signal or the interpolated video signal by one filed nearly the same at all times is reproduced on the CRT and the still picture is reproduced.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a still image reproduction method, and in particular extracts only the advantages of field still reproduction and frame still reproduction to achieve good still image reproduction. Related to still image playback method.

(Prior Art) For example, in a still image playback method in a conventional helical scanning video tape recorder (VTR), two consecutive
Frame still playback that plays fields alternately,
There is field still playback in which only one field is repeatedly played back. Here, FIG. 3 shows a plan view of the rotary head drum.

In the figure, a rotary head drum 1 is rotating together with a rotary shaft 2 in six directions of arrows. 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. 4 or FIG. 5, the rotating video heads 3a and 3b alternately record images on video tracks 5a and 5b, etc. on the magnetic tape 4 scanning in the direction of arrow B. For example, a video signal consisting of a frequency modulated (FM) luminance signal and a low frequency converted carrier chrominance 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, for example, a fast-moving image using the frame still reproduction described above, there is a large difference in information contained in the two fields of video signals to be reproduced, resulting in a difference in the reproduced image. 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 reproduction method that can realize good still image reproduction without deteriorating image quality.

In order to achieve this object, the present invention generates interpolated video signals for one field from video signals for one field sequentially supplied every other field period by interpolation based on a non-increment method. The present invention provides a still image reproduction method characterized in that frame still reproduction is performed by alternately and repeatedly reproducing these video signals and interpolated video signals field by field.

(Operation) In the still image reproduction method as described above, one still image is composed of a video signal for one frame, that is, a video signal for each field and an interpolated video signal.

Therefore, according to the present invention, problems such as deterioration of vertical resolution do not occur.

Further, the interpolated video signal is generated from the video signal by interpolation based on a non-interlace method.

Therefore, these interpolated video signals and video signals have a strong correlation, and even when a moving subject is photographed, no blurring occurs in a still image.

(Example) Hereinafter, a preferred example according to the present invention will be described in detail using FIGS. 1 and 2.

FIG. 1 is a block diagram showing a still image reproducing device for realizing the still image reproducing method according to the present invention.
This process performs component encoding processing to reproduce still images.

That is, the video signal S1 supplied through the input terminal 10 is separated by the decoder 11 into a luminance signal Sy and color difference signals SR-y and 5s-y, and each is supplied to a demultiplexer 12. There is.

As shown in FIG. 2, the video signal S1 consists of a signal portion corresponding to one field and a blank portion corresponding to one field.
For example, this can be obtained by repeating the exposure of photographing light every other field in a television camera and discarding the video signal of the second field.

The luminance signal Sv and the color difference signal SR-y,
Ss-y is sequentially supplied to an A/D (analog-to-digital) converter 13 via the demultiplexer 12, where it is digitized, and then via the multiplexer 14 to a memory 15. 16.
17, respectively.

Each of these memories 15, 16, 17 also has a memory control device for controlling writing or reading of data in these memories 15, 16, 17 in accordance with a mode switching signal supplied via the input terminal 18. A write pulse or a read pulse and an address signal are respectively supplied from the circuit 19, and each memory 15, 16, 17
The luminance signal and color difference signal respectively supplied to the memory 15, 16, 17 are stored and read out based on the respective signals.

The luminance signals and color difference signals read out from each of these memories 15, 16, and 17 are supplied to D/A (digital-to-analog) converters 20, 21, and 22, and are again converted into analog signals. There is.

These luminance signals and color difference signals are sent to an adder 23.2.
4.25 to a video output circuit 26, and is further supplied to an ordinary CRT (cathode ray tube) 27 to be displayed as a video.

On the other hand, the luminance signal and color difference signal read from the memories 15, 16, and 17 are supplied to interpolation circuits 30, 31, and 32, respectively.

These interpolation circuits 30, 31, and 32 perform inter-line interpolation processing or inter-field interpolation processing based on the non-interlace method from the luminance signal and color difference signal, and perform second
An interpolated video signal S2 as shown in the figure is generated.

Note that this interpolated video signal S2 is composed of the interpolated luminance signal and interpolated color difference signal that have been subjected to interline interpolation processing.

Moreover, this interpolation process between lines is generally known, for example, as described in Journal of Television Society v01°40, Nα5
(1986) and others.

The interpolated luminance signal and interpolated color difference signal as described above are
Each interpolation memory 3 is controlled by the memory control circuit 19.
3.34.35 is written to and read from.

Roughly, each interpolated luminance signal and interpolated color difference signal read out from these interpolation memories 33, 34, 35 are converted into analog signals by D/A converters 36, 37, 38, respectively, and then sent to each of the adders 23, 34, and 38, respectively. It is designed to be supplied at 24°25°.

In addition, the horizontal and vertical deflection coils 40.4 of the CRT 27
1 are each supplied with a deflection current from a deflection circuit 42, and the deflection period of these deflection currents is determined by a normal horizontal synchronization signal (H, 5ync) supplied via input terminals 43 and 44, respectively. Or vertical synchronization signal (V, 5yn
It is set to a value synchronized with c).

When a still image is reproduced in a still image reproduction VR device configured as described above, only read pulses and address signals are sent from the memory control circuit 19 to each of the memories 15 and 16.
．． 17 and interpolation memories 33, 34, and 35, and the signals once stored in each of these memories 15, 16, 17, and interpolation memories 33, 34, and 35 are alternately field by field by these readout pulses and address signals. is read out and played repeatedly.

That is, in the first field, the video signal S1 of a predetermined field portion is reproduced as is, and in the blank portion of one field following the first field, that is, the second field, the interpolated video signal S2 is reproduced. Hereinafter, the video signal S1 is reproduced in odd fields, and the interpolated video signal S2 is reproduced in even fields.

As a result, the CRT 27 always has approximately the same predetermined number.
A video based on a field worth of video signals or an interpolated video signal is played back, and a still image is played back.

In a still image reproducing device configured as described above, one still image is composed of a video signal for one frame, that is, a video signal for each field and an interpolated video signal, so it is essentially a frame still image. Since reproduction is performed, problems such as deterioration of vertical resolution do not occur.

Further, since the video signal and the interpolated video signal have a strong correlation, even when a moving subject is photographed, no blurring occurs in the still image.

In addition, when performing normal playback, each of the above memories 15
．． By sequentially rewriting the contents of 16.17 and interpolation memory 33, 34 and 35 into a new video signal Sl and interpolated video signal S2 and reading these alternately field by field, video signal S1 is sequentially reproduced in odd fields. is,
In the even field, the interpolated video signal S2 is sequentially reproduced so as to fill the blank portion of the video signal S1.

As a result, an image is displayed on the CRT 27 through normal reproduction.

Further, the above-described normal playback and still image playback are selectively performed by setting the memory control circuit 19 to one of the modes using the mode switching signal.

<Effects of the Invention> As is clear from the above description, the present invention can convert one field of video signals sequentially supplied every other field period to another one by interpolation based on a non-interlace method.
Frame still reproduction is performed by alternately and repeatedly reproducing interpolated video signals for each field, so that still image reproduction with good image quality can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment according to the present invention, FIG. 2 is a diagram schematically showing the relationship between a video signal and an interpolated video signal,
FIG. 3 is a plan view of a general rotary head drum, and FIGS. 4 and 5 are tape format diagrams showing the operation of the rotary video head during frame still playback and field still playback, respectively. 30.31.32...Interpolation circuit. Kyu 2 drawing x 3 drawing”-7 Houki drawing

Claims (1)

[Scope of Claims] Interpolated video signals for one field are generated from video signals for one field sequentially supplied every other field period by interpolation based on a non-interlace method, and these video signals A still image reproduction method characterized in that frame still reproduction is performed by alternately and repeatedly reproducing interpolated video signals field by field.