JPS6331287A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a reproduced picture having no deterioration in resolution by vector adding respective dynamic vectors for plural fields in the respective parts of a picture according to a reproducing mode, feeding to a muse decoder and correcting a movement. CONSTITUTION:At the time of a special reproduction such as a double speed, a triple speed, a reverse, a control signal reproduced from a fixed head 115 is demodulated according to the mode in a reproduced control signal processing circuit. A signal reproduced from rotating heads 116, 117 is demodulated in a reproduced video signal processing circuit 121. The position relation of a track and a video signal is cleared in a track detection circuit 123 and outputted to a terminal 150. The dynamic vector in the control signal is inputted to a dynamic vector addition circuit 122 and the addition of the vector is performed by the use of a reproduced dynamic vector. The control signal of the dynamic vector is inputted to the dynamic vector setting circuit 140 of the muse decoder 103. The dynamic vector setting circuit 140 changes the dynamic vector outputted from terminals 136, 137 even in one field video signal.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to a video signal recording and reproducing apparatus such as a video tape recorder (hereinafter referred to as VTR) that records and reproduces high-definition television signals. Regarding.

(Prior art) In television broadcasting, the vertical blanking period of the image signal is used to multiplex digitized control signals, and by controlling the image information, the image signal is thinned out and the bandwidth of the transmission signal is increased. A method has been proposed to compress .

One example is the MUSE system promoted by the Japan Broadcasting Corporation, which has a MUSE signal with a multiple signal configuration as shown in FIG. That is, the color signal section 1. These include a luminance signal section (Y) 2, a control signal section 3, a clamp level section 4, a block control signal section 5, a frame pulse line 6, a horizontal synchronization signal section 7, and the like.

This control signal section 3 is composed of a 32-bit signal, the contents of which are shown in FIG. Of this control signal, horizontal motion vector 10 and vertical motion vector 11 using bits NQ 1 to 8
This is used to perform motion compensation in the MUSE system, and prevents the entire screen from becoming a moving area in the case of panning. The motion correction function is shown in FIGS. 5(a) to 5(d). η- shown in FIG. 5(a) is the screen of the previous frame, ga shown in FIG. 5(b) is the screen of the current frame, and the screen υ- and the fence indicate the screen when panning diagonally downward. U shown in FIG. 5(C) is a portion that becomes a moving area when no motion correction is performed, and becomes a full-screen moving area. However, as shown in Figure 5(d), if the previous frame is shifted by the amount that the screen has moved and then read from the memory,
Even when panning, the contents of the past sampling point and the current sampling point overlap, so the edge 25 of the V
All other images can be processed as still images.

FIG. 6 shows the relationship between the tracks on the tape and the reproduced image when a muse signal is recorded using a rotary head in a conventional VTR and is reproduced at high speed or reversely at high speed. That is, the control signals @40-47 of the muse signal are recorded in a part of the video tracks 30-37. Guns 60 to 67 represent the signals of tracks 30 to 37 as blocks, and 7i73 shows signals of double-speed reproduction images (one field each). 70a indicates a signal in the upper half of the screen, and 70b indicates a signal in the lower half of the screen. Here, we will discuss the case of double-speed playback on a VTR with one field per track, but the same applies to a VTR that records one field on multiple tracks. Here, 70a and 71a of the double-speed playback image should be subjected to motion correction using vectors obtained by adding the moving vectors 40 and 41, and motion correction should be performed for 70b and 71b by adding the moving vectors 41 and 42. In addition, motion correction will be performed using only the motion vector 40. Therefore, the reproduced image is subjected to video processing and becomes a blurred reproduced image with lower resolution. Further, since the Miko's signal can only send one control signal to one field, it is not possible to perform motion correction by dividing the one field screen.

(Problems to be Solved by the Invention) The present invention was made in view of the fact that the conventional technology cannot perform motion correction independently in each part of the screen. An object of the present invention is to provide a video signal recording and reproducing device that can obtain a high-resolution reproduced image even during panning by performing motion correction using the present invention.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention uses a band compression signal obtained by subsampling a video signal with inter-field and inter-frame offsets, and a motion detection signal obtained by detecting the motion of the video signal. In a device for recording and reproducing a video signal multiplexed with a control signal including vector and sub-sample phase information, there is provided a device for reproducing the control signal without missing out when performing special reproduction such as high-speed reproduction and reverse high-speed reproduction, and 1 to 1 rack. A device that detects when a field has been exceeded, a device that independently constructs a motion vector in each part of the image corresponding to each track, and a device that constructs motion vectors independently from each other in each part of the image corresponding to each track, A device configured by vector addition of vectors, a decoder that reproduces a video device from a band compression signal and a control signal, and a device that transmits a control signal including the reconstructed motion vector to the decoder. This is used to perform motion correction in each part of the screen.

(Function) The present invention uses the above-mentioned means to reproduce the control signal of each field without any omission, and when performing high-speed and high-speed reverse reproduction,
Depending on the playback mode, motion vectors are added in multiple fields in each part of the screen and sent to the muse decoder, and motion correction is performed in each part of the screen, even during special playback of a VTR.
Motion correction can be performed correctly on the entire screen, and a reproduced image without deterioration in resolution can be obtained even during banning.

(Example) An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. That is, a high-quality video signal input from the terminal 104 passes through the Muse encoder 101 and is extracted to the terminal 124 as a Muse signal. This muse signal is VTR
A video signal/control signal switching circuit 110 of 102 outputs a roll signal (control signal section 3 in FIG. 3) and a video signal (color signal section 1, brightness signal section 2, clamp level section 4, shown in FIG. 3) to the controller 1. .Block control signal section 5.Frame pulse line 6,horizontal synchronization signal section 7). The roll signal to the separated controller 1 is sent to the recording controller 1~
It is subjected to time axis processing and predetermined processing (FM modulation, bias addition, etc.) in the roll signal processing circuit 11, and then passed through a switch 113 connected to the recording side R to the fixed head 11.
Recorded in Qi 1118 at 5. The separated video signal is subjected to FM modulation in a recording video signal processing circuit 112, passes through a switch 114 connected to the recording side R, and is recorded on a tape 118 by rotary heads 116 and 117.

Switches 113 and 114 are switched by a logic circuit 119 in accordance with a mode signal inputted from a terminal 128 (a signal indicating a VTR mode such as recording, playback, or high-speed playback).

During special reproduction such as double speed, triple speed, and reverse play, the control signal reproduced by the fixed head 115 is applied to the reproduction control signal processing circuit 120 through the switch 113 connected to the reproduction side P. In this reproduction control signal switching circuit 120, the control signal is demodulated according to the mode, the time axis is also corrected, and all the control signals are reproduced without missing. On the other hand, the rotating head 116,1
The signal reproduced from 17 passes through a switch 114 connected to the reproduction side P and is demodulated by a reproduced video signal processing circuit 121.

FIG. 2 shows a track pattern when this embodiment is used. On the tape 191, muse control signals 1 to racks 190 in which control signals 181 to 189 of muse signals are recorded by the fixed head 115 and video signal tracks 171 to 180 are formed. Further, the track detection circuit 123 determines the positional relationship between the track and the video signal (correspondence between 73a, 36a, 173b, 37b, etc. in FIG. 6) and outputs it to the terminal 150. The control signal office vector reproduced without omission is inputted to the motion vector addition circuit 122 from the terminal 129.
Here, vector addition is performed using reproduction motion vectors corresponding to the track and video corresponding signals inputted from the terminal 150. This motion vector is output from the terminal 126, and the control signal is output from the terminal 125,
Motion vector setting circuit 140 of Muse decoder 103
Enter. Further, a reproduced Miko's signal is output from the terminal 127 and applied to the terminal 131 of the switch 132 via the Muse signal preprocessing circuit 151. The motion vector setting circuit 140 can change the motion vectors output from the terminals 136 and 137 even within one field video signal, and can temporally change a plurality of motion vectors. In response to this, field memories 134 and 135
and switch 132 to perform interframe subsample interpolation.

Interframe subsample interpolation is to control the delay amount of one frame before so that the sample point of the current frame and the sample point of one frame before satisfy the offset condition with the still image. By changing the readout address of the field memory 135 according to the amount of motion vector input from the field memory 137, motion correction can be performed independently in each part on the screen.

The sub-sample phase can also be set independently for each part on the screen using this method to match the phases.

141 is a muse signal decoding processing circuit connected to the field memories 134 and 135 and the terminal 133 of the switch 132, and the output of this muse signal decoding processing circuit 141 is extracted to the terminal 142.

[Effects of the Invention] As described above, the present invention allows high-speed,
Even when performing special reproduction such as reverse high-speed reproduction, motion correction can be made to match image information and can be performed correctly, and a reproduction signal suitable for a high-quality television signal without deterioration of resolution can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of the structure of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of a track pattern according to the invention, and FIG. 3 is an explanatory diagram showing an example of the configuration of a muse signal of the muse method. , FIG. 4 is an explanatory diagram showing an example of a control signal using the Muse method, FIG. 5 is an explanatory diagram showing an example of motion correction using the Muse method, and FIG. 6 is an explanatory diagram showing a track pattern in a conventional VTR. 101...Muse encoder, 102-VT
R. U03... Muse decoder, 111... Recording control signal processing circuit, 112... Recording video signal circuit, 115... Fixed head, 116, 117... Rotating head, 118... Tape, 119 ... logic circuit, 120 ... playback control signal processing circuit,
121... Reproduction video signal processing circuit, 122... Motion vector addition circuit, 123... Track detection circuit, 1
34, 135... Field memory, 140... Motion vector setting circuit, 141... Muse signal decoding processing circuit, 151... Muse signal pre-processing circuit.

Claims (2)

[Claims] (1) In a device that records and plays back a video signal that is multiplexed with a band compressed signal obtained by subsampling the video signal with inter-field and inter-frame offsets, and a control signal containing motion vectors and subsample phase information that detect motion of the video signal. , a device for reproducing control signals without any loss when performing special reproduction such as high-speed reproduction and reverse high-speed reproduction;
A device for detecting when a track has been crossed; a device for independently configuring motion vectors for each part of the image corresponding to each track; A device configured by vector addition of motion vectors of
It is equipped with a decoder that reproduces a video device from a band compression signal and a control signal, and a device that transmits a control signal including the reconstructed motion vector to the decoder, and uses the motion vector to perform motion correction in each part of the screen. A video signal recording and reproducing device characterized by: (2) The video signal recording and reproducing apparatus according to claim 1, wherein the sub-sampling phase is set independently for each divided portion on the screen.