JPH09200740A - Video encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which can encode video signals in such a manner that the connection points of video signals are processed so that input signals can be processed as if they continue when compression-encoding video signals dividedly recorded in several rolls. SOLUTION: A video signal 101 is defined as an input and encoding is performed to this input by an intra-frame encoder 104, front direction frame predictive encoder 105 and bidirectional frame predictive encoder 106. Then, when a stop frame detector 111 detects an x-th frame in the input video signal, the input video signal 101 is cut off for a prescribed time, encoding parameters 118, 119 and 120 at the time of cut-off are held in an encoding parameter holder 116 and encoding is restarted by these encoding means based on the encoding parameter 117 held at the time of cut-off. Thus, a compression-encoded sequence 108 can be provided so that the input signals can be seemed continuous.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video coding device used for compressing and coding video signals for recording and transmission.

[0002]

2. Description of the Related Art In recent years, as a video signal coding means, an image is divided into blocks composed of a plurality of adjacent pixels, and a discrete cosine transform (DCT) is performed for each block.
It is common to use a transform coding method that performs orthogonal transform such as e Transform). In this transform coding method, transform coefficients are quantized with a predetermined quantization width, and a video signal is compression-coded using a variable length code such as Huffman code.

Further, in moving picture coding such as a television signal, in addition to intra-frame coding in which a video signal of each frame is coded using only video signal information in each frame, inter-frame coding is performed. Inter-frame coding is performed using the correlation of. Inter-frame coding uses forward frame predictive coding that predicts the target frame using the past frame as a reference frame from the frame to be coded and codes the error signal, and past frame and future frame prediction. There is bidirectional frame predictive coding in which a target frame is predicted by using a frame as a reference frame and a prediction error signal thereof is coded. By using these, it is possible to efficiently perform compression coding.

In this case, intraframe coding or forward frame predictive coding is performed for each predetermined frame, and bidirectional frame predictive coding processing is performed on frames between these.
The reference frame for forward frame predictive coding is the frame closest to the intraframe-coded frame located in the past or the forward frame predictive-coded frame. Further, the reference frame of the frame to be bidirectionally frame predictive coded is a close frame among the frames which have been coded in the frame located in the past and the future or the frames which have been forwardly frame predictively coded.

Inter-frame prediction is performed for each block consisting of a plurality of pixels, and the motion amount of each block is detected to perform motion compensation. Therefore, the motion amount of each block is transmitted or recorded together with the prediction error signal.

FIG. 18 shows the configuration of a conventional video encoding device. In FIG. 18, 101 is an input video signal, and 110
Is a frame number detector for detecting the number of frames of the input video signal 101, 113 is an end frame detector for detecting an end frame from the output of the frame number detector 110, 102,
107 is a switch for switching the input video signal 101,
Reference numeral 104 denotes an intra-frame encoder that performs encoding using only video signal information in each frame, and reference numeral 105 denotes a past frame as a reference frame to predict a frame to be encoded and encode an error signal thereof. A forward frame predictive encoder, 106. A bidirectional frame predictive encoder that predicts a target frame using the past frame and the future frame as reference frames and encodes the prediction error signal thereof.
Numeral 103 outputs a prediction mode signal 109 which is determined by the coding cycle thereof, and an encoder controller which gives the prediction mode signal 109 to the three encoders, and 115 an end frame detector 113 to the encoder controller. An end instruction signal given to the switch 103 and the switch 107,
Is a compression coded sequence (bit stream) output from the switch 107.

[0007]

By the way, conventionally, when compressing and coding a moving image such as a television signal, a VT is used.
A part of a certain material such as R is compression-encoded, other parts are truncated, and one stream (compression-encoded sequence)
The method of outputting as is commonly used.

However, as described above, in the coding that performs the intra-frame coding, the forward frame predictive coding, and the bidirectional frame predictive coding, these coding processes are performed in advance in each coding. If an attempt is made to carry out at a designated cycle, when video signals of an arbitrary number of frames are input, it may not be possible to perform encoding processing on the same number of frames as the input frames. This is because, in a frame in which bidirectional frame predictive coding is performed, the intraframe-coded frame located in the future is used as a reference frame, and thus the coding process cannot be completed.

Further, when a movie material or the like for a long time is dividedly recorded over several rolls, it is recorded by connecting it to one tape by compression encoding, so that the first roll and the second roll are separated. When this is compression-encoded and connected, a missing frame may occur at the connection point, or a blackout frame that does not originally exist may be recorded for several frames.

This is because even when a plurality of encoded streams are edited to obtain one stream, there is usually no audio signal in the blacked-out frame, which causes a relationship such as AV synchronization. On top of that, it causes many problems.

That is, for example, there are two digital VTR tapes, the recording time of the first tape is 60 minutes, the recording time of the second tape is 60 minutes, and the first half of the first volume is 0.
If a compression coded sequence of minutes to 10 minutes, volume 10 to 40 minutes, and volume 1 40 to 60 minutes is desired, the conventional procedure is as follows.

First, the tape of the first volume is input from 0 minutes to 60 minutes to a video encoding device using interframe encoding to obtain stream 1 (FIG. 19 (a)).

Next, the tape of the second volume is input from 0 minutes to 60 minutes to a video encoding device using interframe encoding to obtain stream 2 (FIG. 19 (b)).

Next, using a method called stream editing, two streams are desired to be stream 3 (see FIG. 19 (c)).
) To edit. Here, the process of stream editing will be described below.

The stream 1-1 corresponding to 0 to 10 minutes of the stream 1 is cut out. However, if the cutout point (the end frame of the stream) is not the intra-frame coded image or the forward predictive coded image, an extra scene may be included and it cannot be cut exactly. This is because, as described above, since the inter-frame prediction is used for encoding, if the end point of the stream is not the intra-frame encoded image or the forward prediction encoded image, an attempt is made to reproduce the compressed image. This is because a dirty (invisible as a picture) image appears when there is no reference image.

Next, a portion corresponding to 40 minutes to 60 minutes of stream 1 is cut out to form stream 1-2. Even at this time, it will not be possible to cut exactly. Similarly, 10 minutes to 40 minutes of stream 2 is cut out.
This is stream 2-1. There are various techniques for cutting out, but the MPEG2 standard (ISO / IEC
13818), etc., in that video coding section, ITU
-T Draft Rec. H. 262 or ISO
/ IEC13818-2 Draft. 11 describes a coded bitstream.

That is, in addition to clipping, according to this recommendation, how to create stream 1-1, stream 2-1 and stream 1-2 and how to create stream 3 that can be reproduced again by connecting them. Stated.

For example, a stream conforming to the MPEG2 standard usually has one cycle of an intra-frame coded image called GOP (Group of Picture), or a plurality of groups of images including at least one intra-frame image.
G that is the closest to the first point that I really want to cut out
The beginning of the OP is the beginning of the stream, and the end of the GOP near the final cut-out point to be cut out is the end of the stream. In order to enable random access and due to restrictions on the MPEG2 standard, a code indicating the start of the MPEG2 stream is once written at the beginning of the stream, and a code indicating the end of the stream is written at the end. GO
An identification code representing the beginning of the GOP is attached to the beginning of P.

As described above, the stream 1-1, the stream 1-2, and the stream 2-1 are created. Since they always have a plurality of GOPs, the stream is identified from the identification code representing the first GOP of the stream 1-1. DD1 up to the code indicating the end of stream 1-1, DD2 from the identification code indicating the first GOP of stream 1-2 to before the code indicating the end of stream 1-2, and the beginning of stream 2-1 DD3 is from the identification code representing the GOP to the code preceding the end of the stream 2-1. For example, MP
Write the code that represents the beginning of the EG2 video stream, and
Write D1, DD2, DD3, and finally write a code indicating the end of the stream.

In this way, a stream cut out at a position quite close to the desired edit point can be formed. However, in this case, a stream shift of several frames occurs and the inter-frame predicted image is generated. Because it is included, you cannot force a connection.

In view of such a point, the present invention smoothly connects connection points of video signals to be continued, such as originally continuous video signals divided into several turns, and encodes one video signal. It is an object of the present invention to provide a video encoding device that enables compression encoding, recording, and transmission as in the case.

[0022]

In order to achieve the above object, the invention according to claim 1 is a video coding apparatus for compressing and coding and recording and transmitting a video signal, in which an input video signal is passed, Or switch means for breaking off,
Encoding means for performing compression encoding on the video signal that has passed through the switch means and outputting a compression encoded sequence,
A stop frame detecting means for turning off the switch means and outputting a control signal for stopping the encoding operation of the encoding means when a stop frame for stopping the encoding of the input video signal is detected; Coding parameter holding means for holding a coding parameter generated at the time of encoding by the encoding means, the encoding means,
When the input of the video signal is interrupted, the encoding of the input video signal is stopped, and when the input of the video signal is restarted, the encoding held in the encoding parameter holding means is stopped. The encoding of the video signal is restarted based on the same encoding parameters as at the time.

According to a second aspect of the present invention, in the video encoding device, the stop frame detection means detects the stop frame at which input of the video signal should be stopped, and then the control signal is kept for a predetermined period. Is to be output.

According to a third aspect of the present invention, in the video encoding device, the stop frame detecting means outputs the control signal in response to an external signal synchronized with the video signal. is there.

According to a fourth aspect of the present invention, in the video encoding device, the stop frame detecting means is responsive to a time code which is synchronized with the video signal and is recorded together with the video signal. Is to be output.

According to a fifth aspect of the present invention, in the video encoding device, the stop frame detecting means is responsive to a signal generated by manual input, at a timing synchronized with the video signal, and the control signal is generated. Is to be output.

According to a sixth aspect of the present invention, in the video encoding device according to the third aspect, the external signal synchronized with the video signal is an audio signal recorded together with the video signal. When it is determined that the signal level is equal to or higher than a predetermined level by the means for determining whether or not the stop frame detection means is,
The control signal is output.

According to a seventh aspect of the present invention, in the video encoding device, the stop frame detecting means has a predetermined video pattern by the means for determining whether or not the input video signal has a predetermined video pattern. When it is determined that the control signal is output, the control signal is output.

The invention according to claim 8 is, in the above-mentioned video encoding device, means for detecting the screen size of the input image signal, means for holding the screen size of the input video signal when the encoding is stopped, and code A reference image for encoding at the time of resuming encoding, and means for changing to a screen size of the screen size of the input video signal at the time of resuming encoding, and a reference image for encoding at the time of resuming encoding. Is changed to the one having the same screen size as the screen size of the input video signal at the time of restarting the encoding, and the encoding is performed.

According to a ninth aspect of the present invention, in the above video encoding device, means for detecting the screen size of the input image signal, means for holding the screen size of the input video signal when the encoding is stopped, and code Means for changing the input video signal when encoding is resumed to the screen size of the reference image when encoding is stopped, and when the encoding is resumed, the input video signal is changed to the screen size of the input image signal when encoding is stopped. It is assumed that encoding is performed by changing to the one described above.

According to a tenth aspect of the present invention, in the above video encoding device, the time code generating means for self-generating a time code at the time of encoding by the encoding means and the encoding means are created. A means for embedding the self-generated time code in a compression coded sequence, wherein the time code generating means, when the encoding is stopped, also stops the time code generated during the encoding, At the time of restarting the encoding, a time code continuous with the time code at the time of stopping the encoding is generated.

According to an eleventh aspect of the present invention, in a video encoding device for compressing and encoding video signals for recording and transmission, a plurality of input video signals are switched and input according to an input switching signal. For switching the video signal that has passed through the switching means, and coding means for compressing and coding the video signal to output a compression-coded sequence, and the video signal input through the switching means. A switching frame detection means for outputting the input switching signal indicating that the input video signal should be switched, and a coding parameter holding means for holding a coding parameter generated at the time of coding by the coding means, The coding means switches the input video signal held in the coding parameter holding means after the switching by the switching means. Using the same coding parameters as before, it is obtained by those of coding an input video signal.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. Hereinafter, regarding Embodiment 1 of the present invention,
This will be described with reference to the drawings. FIG. 1 shows the configuration of a video encoding device according to the first embodiment of the present invention. In FIG. 1, 101 is an input video signal, 102 and 107 are switchers, 103 is an encoder controller, 104 is an intraframe encoder, 105 is a forward frame predictive encoder, and 106 is a bidirectional frame predictive encoder. , 108 is a compression coded sequence, 109 is a prediction mode signal, 110 is a frame number detector, 112 is a switch, 113 is an end frame detector, and 114 is a switch 112 which is an input video signal 101.
The input switching signal, which is a control signal for controlling so as to shut off, and 115, an end instruction signal, which are the same as those in the conventional example of FIG. A stop frame detector 111 receives the output of the frame number detector 110 as an input, and when a frame for which encoding should be stopped, for example, an X frame, is detected, the input switching signal 114 is set to the switch 1
12 and the encoder controller 103. Reference numeral 112 is a switch for blocking or passing the input video signal 101 in accordance with the input switching signal 114. Reference numeral 116 denotes a coding parameter holder that holds a coding parameter when the coding is stopped, 118, 1
Reference numerals 19 and 120 denote the intra-frame encoder 104, the forward frame predictive encoder 105, the bidirectional frame predictive encoder 106 to the encoding parameter holder 116, respectively.
Is a coding parameter output from the coding parameter holder 116 to each of the above coding devices.

Next, the operation of the video coding apparatus according to the first embodiment will be described. In the video encoding device of FIG. 1, the input video signal 101 is a frame number detector 110,
And to the switch 112. Frame number detector 1
10 detects the number of frames of the input video signal 101, and the detection result is input to the stop frame detector 111 and the end frame detector 113. Here, the stop frame detector 111 has a value of a stop frame X (X is a natural number equal to or less than N) for which the encoding should be stopped in advance, and a predetermined time (the constant time T in FIG. 8) for which the encoding should be stopped. In FIG. 9, the time of P + Q frames, which is determined by the number of frames, is set. Therefore, the stop frame detector 111 detects this as a stop frame when counting X frames, and outputs the input switching signal 114 for switching the switch 112 to the cut-off state. When the P + Q frames are counted, the input switching signal 114 for switching the switch 112 to the passing state is output. On the other hand, the end frame detector 113 outputs the value N of the end frame of encoding.
(N is a natural number) is preset, and when the input video signal reaches the number of frames N, the end frame detector 113 outputs the end instruction signal 115 to the encoder controller 103 and the switch 107. .

The switch 112 passes the input video signal 101 in accordance with the input switching signal 114 which is the output of the stop frame detector 111 and switches the switch 10.
2 or cut off the switch 102
Switch to not input to.

Now, as described above, the frame number detector 1
The total frame number N of the main compression encoding of the video signal is set in 10, and the stop frame detector 111 sets the Xth frame, which is the frame in which the input of the video signal should be stopped, and the stop frame period. It is assumed that the predetermined period T is set and input and the input switching signal 114 is a 1-bit signal. Then, when the number of frames of the input video signal detected by the frame number detector 110 becomes X,
The stop frame detector 111 detects the Xth frame of the input video signal as a stop frame, and switches the input switching signal 114 from 0 to 1 for a predetermined time T thereafter, and during this period, the input switching signal 114 The switch 112 is turned off, and the input video signal 101 is not input to the switch 102. After the lapse of the predetermined time T, the stop frame detector 111 switches the input switching signal 114 from 1 to 0, whereby the switch 112 is turned on, and the input video signal 101 is passed to be input to the switching device 102.

Here, the predetermined time T is, for example, the time interval between the input of the Xth frame and the input of the (X + 1) th frame for which encoding is to be restarted, which is the time between normal frames. This refers to the time when the interval is exceeded. For example, when the input video signal has a length of 400 frames, the first frame to the 200th frame is the first tape of the tape, and the 201st frame to the 400th frame. When the tape is recorded in the second roll of the tape up to the second frame, the above-mentioned predetermined time is the time taken to replace the tape after the encoding is completed at the 200th frame and the 201st after the time. It is equal to the total time until the frame is input, and.
The time required to replace the tape is the time required to replace the tape manually or by an autochanger. In this time, the time during which the first tape is running slightly after the encoding is completed, and the tape After the replacement, it takes time for the second tape to start running and reach a predetermined speed.

Next, the video signal input to the first switch 102 by the switch 112 is encoded by the encoder controller 103, the switches 102, 107, the intra-frame encoder 104, and the forward frame predictive encoder 105. ，
And the bidirectional frame predictive encoder 106, and the encoding means, under the control of the encoder controller 103, according to the periodically determined prediction mode signal 109, Encoder 10
4, input to any of the forward frame predictive encoder 105 and the bidirectional frame predictive encoder 106, and the intraframe coding, the forward frame predictive encoder, and the bidirectional frame predictive encoding are performed in each. The coding result is performed and the prediction mode signal 10
9 is switched and sequentially output to obtain the compression coded sequence 108.

In this way, by the above encoding means,
Encoding is performed on the video signal 101. Here,
For this encoding, encoding such as DCT encoding method or subband encoding for compressing and encoding the video signal is used.
Further, the encoding process is usually performed in frame units, but it may be performed in field units in an interlaced image. In this case, if “frame” in the following description is replaced with “field”, the same result can be obtained. This encoding process ends at N (N is a natural number) frame. At the end of the frame, if it is desired to end the frame with the intra-frame encoded image or the forward frame predictive encoded image, The number may be additionally increased or decreased, or the intraframe coded image may be made continuous only at the terminal end, or the interval between the intraframe coded image and the forward frame predicted image may be changed. Good. Further, in the above-mentioned encoding, the interval for intra-frame encoding or forward frame predictive encoding may be constant or may be changed according to the image, that is, the cycle of the prediction mode may be constant. Well, it can be variable.

In this way, the compression coded sequence 108 is obtained as a result of the coding by the coding means, and the encoder controller 103 has the prediction mode signal 10
9 outputs the signal indicating the coding stop and the signal indicating the coding restart, and when the prediction mode signal 109 is the signal indicating the coding stop, the intra-frame encoder 104, the forward frame The predictive encoder 105 and the bidirectional frame predictive encoder 106 send the coding parameters 118, 119, and 120 to the coding parameter holder 116, respectively, and store these parameters therein.

Coding parameters 118, 119, 120
Means, for example, whether the encoding mode at the time of stopping the encoding is intra-frame encoding, forward frame predictive encoding, bidirectional frame predictive encoding, and which block is processed. Or, the discrete cosine transform coefficient, Q parameter (quantization step), activity, quantization parameter, temporary reference in GOP, reference frame interval, motion vector,
It refers to the parameters necessary for continuous normal encoding, such as the generated code amount of the stopped frame, the generated code amount from the start of encoding to the present, the simulation value of the video buffer verifier in the MPEG2 standard,
For maintaining the continuity of encoding such as the number of encoded images up to the present, and the number of the reference image in the reference image memory when the encoding restart frame is an image that requires inter-frame prediction,
It is an encoding parameter. If the input video signal is an image obtained by performing telecine conversion on the film source and the inverse 32 conversion is performed at the time of encoding before cutoff, the pattern of the inverse 32 conversion is held as an encoding parameter, and the input signal is as if the input signal is continuous. As if it were a signal to

Further, when the prediction mode signal 109 is a signal indicating the restart of coding, the coding parameter holder 116 is provided.
Is an intra-frame encoder 104, a forward frame predictive encoder 105, and a bidirectional frame predictive encoder 106.
On the other hand, the coding parameter held at the time of stop is output as the coding parameter 117.

During the above operation, the frame number detector 1
The detection result of 10 is also sent to the end frame detector 113, and as described above, the end frame detector 113 holds the number of frames N, and when the number of frames reaches this N, the end instruction signal is sent. 115 is switched from “0” to “1”, and the switch 107 is turned off.
The end instruction signal 115 is also sent to the encoder controller 103 to end the encoding.

FIG. 8 shows a timing chart of connection points for compression encoding by the encoding processing according to the first embodiment. In the first embodiment, up to the X frame of the first roll of tape and the first frame and subsequent frames of the second roll are to be continuously encoded. As shown in FIG. 8, when the video signals up to the Xth frame of the first roll are encoded, the Xth frame is detected by the stop frame detector 111 as a stop frame, and the encoding is stopped. The coding parameter at that time is held in the coding parameter holder 116. Here, even in the conventional configuration shown in FIG. 18, the encoding is performed using the encoding parameter, but the encoding parameter is held in a register or the like that can hold data for a short time, and the next signal is input. However, the coding parameters cannot be held for a long time as in the first embodiment. While the encoding is stopped for the predetermined time T in the X frame, the tape of the first roll is switched to the tape of the second roll, and the input of the video signal of the X + 1 frame is completed. As a result, the encoding parameter 11 at the time of encoding the X frame of the first roll is
On the basis of 7, the video signals of the X + 1th frame and subsequent frames of the second tape are encoded. As a result, the video signals divided and recorded in the first and second windings can be recorded without inserting an extra frame between the originally continuous frames.
It is possible to perform compression encoding as if they were continuous and output the stream, that is, the compression encoding sequence 108.

After that, encoding is performed until the total number of frames of the video signal detected by the frame number detector 110 reaches N frames.

The input switching signal 114 and the end instruction signal 115 do not necessarily have to be signals "0" and "1", and any signal having one bit or more may be used.

When the (X + 1) th frame is input while the encoding is stopped for the predetermined time, the input video signal is one of a plurality of different media, such as a home VTR, a D1 standard compliant digital signal. VTR, D3 standard compliant digital VTR, D5 standard compliant digital VTR, L
It may be input from D, HDTV, or the like, or may be signals of originally non-continuous frames of the same medium.

The stop frame detector 111 may stop and restart the video signal at a plurality of points.

Further, the intra-frame encoder 104, the forward frame predictive encoder 105, and the bidirectional frame predictive encoder 106 may start encoding by the frame synchronization signal in the video signal, or as described above. As described above, the coding may be started according to the prediction mode signal 109.

Further, as the above-mentioned stop frame, the frame which can be stopped may be either intra-frame coding, intra-frame coding or forward predictive coding. Then, when the encoding is restarted, the encoding may be performed in the prediction mode that should be encoded next when the encoding is stopped, or the encoding is restarted from the intra-frame encoded image. Alternatively, multiple frames may be used as the intra-frame coded image, the first frame after the coding is resumed is the intra-frame coded image, and then the multiple frames are coded at the normal reference frame interval as the forward prediction image. You may make it into.

The timing of stopping and resuming the encoding may be in frame or field units, or in pixel units.

The above-mentioned predetermined time may be measured by a timer. For example, as shown in the timing chart of FIG. 9, the number of frames (P + Q) input to the frame number detector 110 may be measured. May be.

That is, for example, in a video that requires up to the Xth frame of the first tape, the Xth frame after the Xth frame is required.
Blackout frames are recorded in P frames up to + P (P is a natural number), and Q (Q is 0 or a natural number) blackout frames are recorded at the beginning of the second tape. It has been done.

At this time, the stop frame detector 111 stops the input of the video signal at the Xth frame by switching the switch 112, and X + I (I = P +) of the input video signal.
The timing of the connection point when the switch 112 is switched and the encoding is restarted in the (Q) th frame is as shown in FIG. 9, and the blacked-out frame is inserted into the compression encoding sequence 208. Encoding can be done without.

According to the first embodiment as described above, when a plurality of reproduction signals from several kinds of media are edited by compression encoding, when the stop frame is detected, the encoding parameter at the time of the encoding stop is held. However, since the encoding is restarted by using the encoding parameter when the encoding is restarted, even if the input video signal is discontinuous, the connection point is set as if the input video signal is continuous. It can be compression-encoded in a regular manner.

Second Embodiment FIG. 2 shows the configuration of a video encoding device according to the second embodiment of the present invention. In FIG. 2, 201 is an input video signal, 202 and 207 are switches, 203 is an encoder controller, 204 is an intra-frame encoder, 205 is a forward frame predictive encoder,
Reference numeral 206 is a bidirectional frame predictive encoder, 208 is a compression encoded sequence, 209 is a prediction mode signal, 210 is a frame number detector, 211 is a stop frame detector, 212 is a switch, 213 is an end frame detector, and 214 is an input. A switching signal, 215 is an end instruction signal, 216 is a coding parameter holder, 217, 218, 219 and 220 are coding parameters, and 221 is an external signal.

The video encoding apparatus according to the second embodiment shown in FIG.
The second embodiment is the same as the video encoding apparatus according to the first embodiment of FIG. 1 except that the external signal 221 is added.
Then, the external signal 221 is input to the stopped frame detector 211, and the stopped frame detector 211 receives the external signal 221.
Also, the input switching signal (control signal) 214 for stopping the encoding operation is output.

Next, the operation of the video coding apparatus according to the second embodiment will be described. For example, the external signal 221,
And the input switching signal 214 as a 1-bit signal,
As in the first embodiment, assuming that the number of frames set and input in the frame number detector 210 is N, which is the total number of frames in the encoded sequence by the main encoding, the stopped frame detector 211 receives the input frames. Among them, for example, the X-th frame is detected as a stop frame, and the input switching signal 214 is changed from 0 to 1 in the X frame, whereby the switch 212 is turned off and the video signal is not input to the switch 202. After the predetermined time T designated by the external signal 221, the external signal 221 changes from 0 to 1, so that the stop frame detector 211 changes the input switching signal 214 from 1 to 0.
12 is turned on again, and the video signal is input to the switch 202. Other operations are similar to the above, and thereafter, encoding is performed until the total number of frames detected by the frame number detector 210 reaches N frames.

The external signal 221 is not always 0 or 1 like the input switching signal 214 and the end instruction signal 215.
The signal need not be a signal of 1 bit, and any signal of 1 bit or more may be used.

The stop frame detector 211 may determine the timing for restarting the encoding by the encoding means or the timing for interrupting the input video signal in accordance with the external signal 221. Well again
The input video signal may be cut off and the encoding may be restarted at a plurality of locations in the video signal.

The external signal 221 is the input video signal 2
01 may be synchronized with the input video signal 201, for example, a time code that is applied to the recording medium together with the input video signal 201, and thus is synchronized with the input video signal 201, and the presence or absence of character information related to vertical blanking of the video signal. The signal generated by using can be used as the external signal 221.

FIG. 10 shows the timing of the compression coding connection point when the external signal 221 is generated from the time code as described above.

For example, in the video that requires up to the Xth frame of the first tape, X + P after the Xth frame
A blackout frame is recorded in the (P is a natural number) frame, and Q is recorded at the beginning of the second tape.
It is assumed that (Q is 0 or a natural number) blackout frames are recorded.

At this time, the stop frame detector 211 changes the input switching signal 214 from "0" to "1" at the Xth frame, so that the input of the video signal is switched to the switch 2.
12 is switched to the OFF state to stop the encoding, and for example, the time code of the frame for which the second encoding is to be started is “HH time MM minute SS second FF frame” (for example,
HH is an integer from 0 to 24, and MM and SS are from 0 to 5
The integer is 9 or less, and FF is an integer from 0 to 29. )
, The time code “HH” recorded on the tape together with the video signal by an external circuit (not shown).
Time MM minute SS second FF frame "is detected, the external signal 221 changes from" 0 "to" 1 ", and the stop frame detector 211 detects X + I (I = P + Q) of the input video signal.
By changing the input switching signal 214 from “1” to “0” in the second frame, the compression coding sequence 208 when the switch 212 is switched to the ON state and the coding is restarted
The connection points inside are as shown in the X frame and the X + 1 frame portion in the compression coded sequence 308 of FIG. 10, and the blacked out frame is encoded without being inserted into the compression coded sequence 208. It can be carried out. After that, the frame number detector 210 performs coding until a total of N frames are detected.

The end frame may be detected by detecting the time code.

According to the second embodiment as described above, when a plurality of reproduction signals from several kinds of media are edited by compression encoding, desired video signals are connected to each other at a timing synchronized with the video signals. Thus, it is possible to obtain a compression coded sequence as if the input video signal were continuous.

Third Embodiment Further, FIG. 3 shows the third embodiment of the present invention.
2 shows a configuration of a video encoding device according to the embodiment. FIG.
In the figure, 301 is an input video signal, 302 and 307 are switchers, 303 is an encoder controller, 304 is an intraframe encoder, 305 is a forward frame predictive encoder, 306 is a bidirectional frame predictive encoder, 308 Is a compression coded sequence, 309 is a prediction mode signal, 310 is a frame number detector, 311 is a stop frame detector, 312 is a switch, 313 is an end frame detector, 314 is an input switching signal, 315 is an end instruction signal, 316 Is an encoding parameter holder, 317, 318, 319 and 320 are encoding parameters, 321 is an external signal, and 322 is an external signal generator.

The video coding apparatus according to the third embodiment shown in FIG.
Except that an external signal generator 322 for generating an external signal 321 is provided, the configuration is the same as that of the video encoding device according to the first embodiment in FIG. 1, and in the third embodiment, the external signal generator 3 is used.
The external signal 321 generated by 22 is input to the stop frame detector 311, and the stop frame detector 311 is also stopped by the external signal 321.

FIG. 11 shows a timing chart of connection points for compression encoding by the encoding processing according to the third embodiment.

Here, in the third embodiment, the video signal up to the Xth (X is a natural number) frame of the first tape is required, but the video signals after that are not required. Next, consider a case where the first frame of the second volume is desired to be encoded. That is, it is intended to encode two originally discontinuous images as if they were continuous images.

As shown in FIG. 11, the external signal generator 32
2 is a manual input to switch the external signal 321 not synchronized with the video signal from, for example, “0” to “1” in the Xth frame, and input by the switch 312 by the stop frame detector 311 which detects this. Video signal 3
01 is cut off, the encoding controller 203 is controlled to stop the encoding, and when the input of the second volume starts, the external signal 321 which is the output of the external signal generating means 322 is manually input again. "1" to "0"
, The switch 312 is turned on to input the input video signal 301 to the encoders 304, 305,
The data is input again to 306, and the encoding is restarted using the encoding parameter used when the encoding was stopped. Here, the external signal generator 322 does not synchronize with the video signal,
Although the external signal 321 is generated, the timing of shutting off the switch 312 and the switches 302 and 307 may be performed for each frame or for each pixel.
By doing so, the video up to the X frame of the first roll and the video from the first frame of the second roll are encoded as if they were continuous video.

As described above, according to the third embodiment, when a plurality of reproduction signals from several types of media are edited by compression coding, the editing is performed while removing unnecessary portions by manual input. be able to.

Embodiment 4 FIG. FIG. 4 shows the configuration of a video encoding device according to the fourth embodiment of the present invention. In FIG. 4, 401 is an input video signal, 402 and 407 are switchers, 403 is an encoder controller, 404 is an intraframe encoder, 405 is a forward frame predictive encoder,
406 is a bidirectional frame predictive encoder, 408 is a compression encoded sequence, 409 is a prediction mode signal, 410 is a frame number detector, 411 is a stop frame detector, 412 is a switch, 413 is an end frame detector, 414 is an input. A switching signal, 415 is an end instruction signal, 416 is a coding parameter holder, 417, 418, 419, and 4201 coding parameters, 421 is an external signal, 422 is an external signal determination unit, and 423 is a determination result.

The coding apparatus according to the fourth embodiment shown in FIG. 4 has an external signal 421, an external signal judging device 422, and a judgment result 42.
3 is the same as the video encoding apparatus according to the first embodiment of FIG. 1 except that the external signal 421 is provided.
Is input to the external signal determiner 422, and the external signal determiner 4
22 determines whether the external signal 421 has a predetermined value, and the determination result 423 is the stop frame detector 411.
And the stop frame detector 411 outputs the determination result 42
The stop point is detected according to 3.

In the fourth embodiment, for example, the video up to the Xth frame of the first tape is required, and the audio signal is almost silent in the Xth and subsequent frames, for example, black. An out frame is recorded. At the beginning of the second tape, Q (Q is 0 or a natural number) blackout frames in which the audio signal is close to silence are recorded, and the second tape is recorded. It is assumed that the frames from the Q + 1th frame are required images. The fourth embodiment is intended to encode these two discontinuous video images as if they were continuous video images.

FIG. 12 is a timing chart of connection points for compression coding by the coding processing according to the fourth embodiment. In the fourth embodiment shown in FIG. 4, the external signal 421 is
Is an audio signal recorded on the tape together with the video signal and synchronized with the input video signal 101, and the external signal determiner 422 determines that the signal level of the external signal 421 is the threshold value K.
(Decibel) (K is an arbitrary integer or decimal number) is determined, and a determination result 423 is output. For example, assuming that the determination result 423 is a 1-bit integer, the stop frame detector 411 encodes when the determination result 423 is 0, but cuts off when the determination result 423 is 1 and does not encode.

As shown in FIG. 12, the external signal judging device 42
Since 2 is not silent until the X-th frame of the first roll, the determination result 423 is set to 0 and encoding is continued, but X
Since the +1 frame to the X + P frame is a silent section (blacked out frame), the determination result 42
3 is set to "1", which controls the switch 412 to cut off the encoding.

Then, the reproduction of the first volume is stopped and the second volume is reproduced, but the external signal judging unit 42 is used up to the first Q frame.
2 is still in the silent section (blacked out frame), the determination result 423 is set to “1”, and coding is not performed, but since the signal level of the external signal 421 exceeds the threshold value K in the Q + 1th frame. , The judgment result 423 is “0”
As a result, the encoding is restarted.

In this way, the first frame of the X frame and the second frame of the Q + 1 frame and thereafter can be encoded as one continuous video image.

The determination result 423 is not necessarily a signal of "0" and "1", and may be any signal of 1 bit or more.

The stop frame detector 411 may stop the encoding and restart the encoding at a plurality of points of the video signal.

Further, the external signal 422 is not limited to the audio signal but is a signal synchronized with the input video signal 401,
Any signal may be used as long as it is a signal that changes for each frame, field, or pixel.

If it is not enough to start the encoding of the first pixel by judging whether the external signal 422 is at a predetermined level or not, the input video signal 401 is judged as an external signal judging device. It may be delayed until the determination of the signal level of the external signal 422 is completed by 422.

According to the fourth embodiment as described above, when a plurality of reproduction signals from several kinds of media are edited by compression coding, the editing can be performed while removing a portion having no audio signal. it can.

Fifth Embodiment FIG. 5 shows the configuration of a video encoding device according to the fifth embodiment of the present invention. In FIG. 5, 501 is an input video signal, 502, 507 are switchers, 503 is an encoder controller, 504 is an intraframe encoder, 505 is a forward frame predictive encoder,
506 is a bidirectional frame predictive encoder, 508 is a compression encoding sequence, 509 is a prediction mode signal, 510 is a frame number detector, 511 is a stop frame detector, 512 is a switch, 513 is an end frame detector, and 514 is an input. A switching signal, 515 is an end instruction signal, 516 is a coding parameter holder, 517, 518, 519 and 520 are coding parameters, 521 is a judgment result, 522 is a predetermined pattern judging device, and 523 is a delay device.

The coding apparatus according to the fifth embodiment of FIG. 5 is completely the same as the apparatus according to the first embodiment of FIG. 1 except that a predetermined pattern judging device 522, a judgment result 521 thereof, and a delay device 523 are provided. It is the same. That is, in the fifth embodiment, the input video signal 501 is input to the predetermined pattern determination unit 522, the predetermined pattern determination unit 522 determines whether the input video signal 501 has a predetermined video pattern, and the determination result 521
Is input to the stop frame detector 511, the stop frame detector 511 detects a stop position according to the determination result 521, and at the same time, the predetermined pattern determiner 522 delays the input video signal 501 for a time period for determining whether the predetermined pattern is detected. The delay is made at 523.

FIG. 7 shows, as an example, a block diagram of the predetermined pattern determination unit 522 when the predetermined pattern is a blackout, and its operation will be described below. Figure 7
In, the input video signal 701 is a predetermined level comparator 70.
3, the predetermined level comparator 703 compares the input video signal 701 with the predetermined level 702, and the input video signal 70
If 1 is equal to or lower than the predetermined level 702, the determination result 704 is set to “1”, and otherwise, the determination result 704 is set to “0” and the determination result accumulator 705 is sent.

The judgment result accumulator 705 sets the cumulative value 706 to "0" for each image, that is, according to the extraction result 708 of the vertical synchronizing signal extractor 707, and the predetermined level comparator 7
The determination result 704 according to 03 is cumulatively added for each pixel. As a result, the cumulative value 706 becomes 0 → A [M] (M is the number of pixels, A <M). Vertical sync signal extractor 707
Then, the vertical synchronizing signal is extracted from the input video signal 701, and the extraction result 708 is output to the judgment result accumulator 705 and the black level threshold comparator 709, and the black level threshold comparator 71 is output.
At 0, the cumulative value 706 is compared with the black level threshold value 709 for each vertical synchronization signal according to the extraction result 708, and it is determined whether the image is a blackout image or not.
Output as 11. Here, in correspondence with FIG. 5, the input video signal 701 corresponds to the input video signal 501, and the blackout determination result 711 corresponds to the determination result 521.

The predetermined patterns include blackout, blueback, greenout, color bar,
Any image having regularity such as a still image or a test pattern may be used.

As a method of detecting the predetermined pattern, pattern matching may be used, or the regularity of an image such as a color bar in which the signal level changes stepwise may be determined.

FIG. 13 shows a timing chart of connection points for compression encoding by the encoding processing of the fifth embodiment. In the fifth embodiment, for example, a video that requires up to the Xth frame of the first tape, and X + after the Xth frame is required.
A blackout frame is recorded in the Pth (P is a natural number) frame, and Q (Q is 0 or a natural number) blackout frames are recorded in the beginning of the second tape. To do.

For example, assuming that the determination result 521 is a 1-bit integer, the stop frame detector 511 determines that the determination result 52 is
When 1 is "0", encoding is performed, but when it is "1", the input signal is cut off and encoding is not performed.

As shown in FIG. 13, the predetermined pattern discriminator 522 does not black out the input video signal 501 until the X-th frame of the first roll.
Encoding is continued with 21 set to "0". But X
In the + 1st frame, the predetermined pattern determination unit 522 determines that the frame is blacked out, and the determination result 52
1 is changed from "0" to "1" and coding is cut off.

Then, the reproduction of the first volume is stopped and the second volume is reproduced, but until the first Q frame, the predetermined pattern determination means 522 determines that the frame is still a blackout frame. Although the determination result 521 is set to "1" and encoding is not performed, it is determined that the frame is not the blackout frame at the Q + 1th frame, the determination result 521 is set to "0", and encoding is restarted.

By doing so, the first frame of the X frame and the second frame of the Q + 1 frame and subsequent frames can be encoded as one continuous video image.

As described above, according to the fifth embodiment, when a plurality of reproduction signals from several kinds of media are edited by compression encoding, the editing can be performed while removing a predetermined video pattern.

Sixth Embodiment FIG. 15 shows the configuration of a video encoding device according to the sixth embodiment of the present invention. The sixth embodiment of the present invention is the same as the first to fifth embodiments, except that N
The TSC signal and the high-definition signal can be dealt with even when the screen size of the input video signal changes. In FIG. 15, reference numeral 151 denotes the input image signal 10
Screen size detector for detecting screen size from 1 155
Is a screen size memory that holds the output screen size 156, 152 is a reference frame that is referred to during encoding, and 154 is the reference image 1 from the reference frame 152.
A screen size changer for changing the screen size of 53,
The output is input to the forward frame predictive encoder 105 and the bidirectional frame predictive encoder 106. Other configurations are the same as those in FIG.

Next, the operation will be described. The above first
In the fifth embodiment, the video encoding device is, for example, N
Although the video encoding device is compatible with the TSC signal, the sixth embodiment is also applicable to the case where two or more types of video signals having different screen sizes, such as NTSC signal and high vision, are used as input signals as the source image. This is adapted so that the screen size of the reference image is changed in accordance with the change of the screen size of the input image.

Now, in FIG. 15, the encoding means is NT
It is assumed that both the SC signal and the high-definition signal can be encoded, and the NTSC signal is input as the input video signal 101, for which the reference frame 152 is NTS.
It is a reference frame of the C signal, and it is assumed that the first video signal input is correctly coded. Next, it is assumed that a high-definition signal is input after a predetermined period of time has passed after a stop frame was detected and encoding was stopped, or when encoding was restarted under other conditions. At this time, if the screen size of the input video signal 101 is the screen size detector 15
1 is detected. Here, in the case of NTSC signal, 7
It is determined to be 20 × 480 pixels, and in the case of a high-definition signal, it is determined to be 1152 × 1920 pixels. Here, the screen size of the input video signal 101 when the encoding is stopped is detected by the screen size detector 151, and the screen size memory 1 is detected via the encoder controller 103.
When the encoding is restarted, the image size determination result stored in the screen size memory 155 is input to the encoding controller 103. If the image size has not been changed, the encoder controller 103 reads the encoding parameter from the encoding parameter holder 116 and restarts the encoding of the input video signal based on the read encoding parameter. However, in this case, since the screen size has been changed, reference frame 1
The screen size of the reference image 153 from 52 is changed by the screen size changer 154 from the size of 720 × 480 pixels of the NTSC signal to 1152 × 1920 of the high definition signal.
Encoding is performed by changing to the pixel size, using the reference pixel of this screen size, and using the other encoding parameters when the encoding is stopped.

At this time, when the screen size of the input video signal is larger than before the encoding is stopped, the reference frame 152 at the time of the encoding stop is up-converted to newly create a reference frame having a large screen size. When it is smaller than before the encoding is stopped, the reference frame 152 is down-converted to create a new reference frame having a small screen size, and the new reference frame is referred to for encoding. In this way, compression encoding can be performed by including compression encoding sequences for input video signals having different screen sizes in one compression encoding sequence. As described above, the compression encoding of the present invention as if the input video signal is a continuous signal can be performed even for video signals from a plurality of media having different source image screen sizes. is there.

After the coding is restarted, the coding controller may specify the intra-frame coding as the prediction mode in a plurality of frames, or depending on the prediction mode in the coding parameter, You may match with the pattern of an encoding mode.

When the screen sizes are different, the coding controller may perform intraframe coding for a plurality of predetermined frames and discard the reference image after the coding is restarted.

Further, when a plurality of intra-frame coded images at the time of restarting the coding are continued, the plurality of frames are limited to a value equal to or larger than the number of reference image memories so that reference images having different image sizes do not remain in the reference frames. May be.

Further, when the size of the screen to be edited differs between when the coding is stopped and when the coding is restarted, and when the size of the image data is recorded in the compression coded stream like MPEG2, the coding size should be changed. , Is recorded in the compression coded sequence at the time of restarting the coding. For example, in terms of MPEG2, it is necessary to embed a code representing spatial scalability in a compression coded sequence by using a spatial scalability profile or the like.

Whether the video coding apparatus maintains continuity at the time of coding stop and at the time of coding restart and which parameter is newly updated is determined by the normal decoding of the compression coded sequence. Also, any setting may be used as long as it can be reproduced. For example, when the input video signal switches from a film source to a video source, when encoding is stopped,
The flag necessary for reverse 23 pulldown is held as a coding parameter, but the coding controller detects that the coding of the video image has started by the reverse 23 pulldown circuit and determines that it is a video material. The inverse 23 conversion of the video signal may be stopped and the encoding may be restarted. In this way, the condition necessary for the source to be edited to continue at the time of restarting the encoding may be the encoding parameter.

According to the sixth embodiment, the NTS
Even when the C signal and high-definition, etc., which have different screen sizes are used as input signals, the size of the reference image for encoding is changed according to the screen size of the input video signal. The input signal can be accurately encoded, and a required compression encoded sequence can be obtained. Therefore, the obtained compression coded sequence includes ones having a plurality of screen sizes. However, regardless of the screen size of the input video signal, the input signal can be input to a plurality of reproduction signals from several media. It is possible to perform stream editing by compression encoding as if they were continuous.

Seventh Embodiment FIG. 16 shows the configuration of a video encoding device according to the seventh embodiment of the present invention. Similar to the sixth embodiment, the seventh embodiment is adapted to cope with the case where two or more kinds of video signals having different screen sizes are input signals as the source image. In the seventh embodiment, contrary to the sixth embodiment, the screen size of the input video signal is adapted to the screen size at the time of restarting the encoding and at the time of stopping the encoding.

In FIG. 16, 160 is the input video signal 1
Screen size detector for detecting screen size from 01, 16
2 is a screen size memory that stores the detected screen size,
Reference numeral 163 is a screen size changer for changing the screen size according to an instruction from the screen size detector 161, and 164 is an input video signal 101 to the terminal a and a screen size changer 163 to the terminal b.
Is a switch for switching between the input video signal whose screen size has been changed by and outputting to the switch 102. Other configurations are the same as those in FIG.

Next, the operation will be described. First, it is assumed that the encoding means of the seventh embodiment can encode both NTSC signals and high-definition signals. For example, when an NTSC signal is input as the input video signal 101, the screen size detector 160 determines that the input video signal 101
Screen size, 720x480 pixel size is detected,
When the stop frame detector 111 detects a stop frame and the switch 164 is turned off by the input switching signal 114 and the encoding is stopped, the screen size of the NTSC signal is stored in the screen size memory 162. Then, when the encoding detected by the stop frame detector 111 is restarted, the screen size of the input video signal 101 is also detected by the screen size detector 160.
For example, as in the case where the input video signal 101 is a high-definition signal, the screen size is set to the screen size memory 162.
If the screen size is larger than the screen size at the time of the stop of the encoding stored in, the input video signal 101 is down-converted by receiving the output 160a of the screen size detector 160 and averaging by the screen size changer 163. If the screen size is the same as that of the NTSC signal and the screen size of the input video signal is smaller than the screen size stored in the screen size memory 162 when the encoding is stopped, the screen size changer 163 performs interpolation or the like. Is used to up-convert the input video signal 101 to a large screen size, and the video signal whose screen size has been changed in this way is input to the terminal b of the switch 164. With switch 164,
Similarly, the output 160a of the screen size detector 160 is received, the video signal input to the terminal b is selected, and this is input to the switcher 102. This allows
Even when the screen size of the input video signal 101 is different between when the coding is stopped and when it is restarted, the coding means after the switcher 102 has the same screen size when the coding is stopped and restarted. A signal, in this case an NTSC signal having a screen size, is input. Therefore, as in the case where a video signal having the same screen size is input to the video encoding device itself, the input video signal is a continuous signal. The compression encoding of the present invention as if it were possible. Therefore,
Similar to the sixth embodiment, the compression encoding of the present invention can be performed on video signals from a plurality of media having different source image screen sizes.

In the above description, the encoding means is capable of encoding both NTSC signals and high-definition signals. However, the encoding means encodes only NTSC signals or high-definition signals. Even if it is possible, it suffices to detect the screen size of the input video signal, change it to a signal of a size that can be coded by the device, and then carry out coding, so that the device can be configured in almost the same manner. .

According to the seventh embodiment as described above, the NTS
When inputting signals with different screen sizes such as C signal and high-definition signal, change the input video signal at the time of restarting the encoding to the screen size of the video signal at the time of stopping the encoding. Therefore, it is possible to standardize the input signal screen size for encoding, and whether the input signal is continuous for multiple playback signals from several media regardless of the screen size. It is possible to perform stream editing by compression encoding such as.

Eighth Embodiment FIG. 17 shows the configuration of a video encoding device according to the eighth embodiment of the present invention. The eighth embodiment of the present invention is the video encoding device according to the above-mentioned first embodiment, in which the encoder has a function of self-generating a time code. The continuous time code is embedded in.

In FIG. 17, the same reference numerals as those in FIG. 1 denote the same or corresponding portions, and 132 denotes the encoder controller 1
When the prediction mode signal 109 from 03 is input and the encoding means including the encoders 104, 105 and 106 is performing encoding, the time code generating means for self-generating the time code, and 134 is the output thereof. A generated time code, which is an intraframe encoder 104,
It is input to the forward frame predictive encoder 105 and the bidirectional frame predictive encoder 106. It should be noted that this may be input only to the intraframe encoder 104, and the timecode may be embedded only in the frame in which the intraframe encoding has been performed, so that the timecode is embedded in the compression encoded sequence. 133 is a time code stack for accumulating the time code self-generated by the time code generating means 132. This is a time code stack when the input switching signal 114 from the stop frame detector 111 is input to the time code generating means 132. accumulate. Also, 135
Is a compression coded sequence in which a time code is embedded.

Next, the operation of the eighth embodiment will be described. In the eighth embodiment, the input video signal 101
In contrast, the intraframe encoder 104, the forward frame predictive encoder 105, and the bidirectional frame predictive encoder 106
At the same time as the encoding is performed by the encoding means such as, the time code generating means 132 self-generates a time code, and the time code is generated by the intra-frame encoder 104, the forward frame predictive encoder 105, and the bidirectional frame predictor. The self-generated time code is input to the encoder 106 or only the intraframe encoder 104, and the self-generated time code is compressed and encoded.
35 is embedded. This allows
As in Embodiments 1 to 5, when the coding is temporarily stopped and then restarted at a timing after a predetermined time or at a timing determined by other conditions, the coding parameters are the same as those at the time of the stop. By performing encoding as a parameter, it is possible to perform compression encoding as if the input video signal is continuous, and also obtain continuous time codes in the compression encoded sequence. It is a thing.

According to the eighth embodiment as described above, since the time code is self-generated and the time code is embedded in the compression coded sequence, a plurality of reproductions from several media are performed. When a signal is edited by compression coding, an edit stream having a continuous time code can be obtained, and a convenient one can be obtained when editing this.

Ninth Embodiment FIG. 6 shows the configuration of a video encoding device according to the ninth embodiment of the present invention. In FIG. 6, 601, 621 are input video signals, 602, 60.
7, 612 is a switch, and 603 is an encoder controller.
La, 604 is an intraframe encoder, 605 is a forward frame predictive encoder, 606 is a bidirectional frame predictive encoder, 608 is a compression coded sequence, 609 is a predictive mode signal,
610 is a frame number detector, 611 is a switching frame detector, 613 is an end frame detector, 614 is an input switching signal, 615 is an end instruction signal, 616 is an encoding parameter holder, and 617, 618, 619 and 620 are codes. The conversion parameter 622 is an external input switching signal.

Next, the operation of the video coding apparatus according to the ninth embodiment will be described. In the video encoding device of FIG. 6, the input video signals 601 and 621 are input to the switch 6
12 is input. The frame number detector 610 outputs the input video signals 601 and 621 which are output from the switch 612.
The number of frames of any one of the video signals is detected, and the detection result is input to the switching frame detector 611 and the end frame detector 613. The switch 612 switches between the input video signal 601 side and the input video signal 621 side on the input side of the switch 612 according to the input switching signal 614 output from the switching frame detector 611.

For example, assuming that the input switching signal 614 is a 1-bit signal, a total of N frames (N is a natural number) are input to the frame number detector 610, and the switching frame detector 611 has X ( X is a natural number less than or equal to N) th frame is set as a switching frame, the Xth frame of the input frames is detected as a switching frame, and the input switching signal 61
4 is switched from “0” to “1”, and the input side of the switch 612 is changed from the input video signal 601 side to the input video signal 621.
Switch to the side. The switching frame detector 611 switches the input switching signal 614 from “1” to “0” by switching after a predetermined time set in the switching frame detector 611 or when the external input switching signal 622 changes. The input side of the device 612 is switched from the input video signal 621 side to the input video signal 601 side. For example, the external input switching signal 622 is “0” at the start of encoding, and the input of the switch 612 is on the input video signal 601 side.
When 22 changes from “0” to “1”, the switch 612
Is input to the input video signal 621 side.

Here, the switching of the switch 612 is as follows.
For example, when the external input switching signal 622 is inverted, it may be switched to a side different from the side currently input by the switch 612.

The above-mentioned predetermined time is, for example, X + 1 at which encoding is desired to be resumed after the Xth frame is input.
When the time interval until the input of the second frame exceeds the time interval between normal frames, it means that time. For example, the input video signal has a length of 400 frames. From the 1st to the 200th frame, the first roll of tape is
When the tape is recorded in the second roll of the tape up to the 00th frame, the predetermined time is the time required for replacing the tape after the encoding is completed at the 200th frame and the time 201 after the time. It is equal to the time until the second frame is input, and.

Next, the video signal input to the switch 602 by the switch 612 includes the encoder controller 603, the switches 602 and 607, the intra-frame encoder 604, the forward frame predictive encoder 605, and The bidirectional frame predictive encoder 606 is input to the encoding means, and the encoding means responds to the predictive mode signal 609 determined by the encoder controller 603 periodically or aperiodically. , The intraframe encoder 604, the forward frame predictive encoder 605, and the bidirectional frame predictive encoder 60 via the switcher 602.
6 is input to each of them, and intraframe coding, forward frame predictive coding, and bidirectional frame predictive coding are performed in each, and the coding result is the second
Is switched according to the prediction mode signal 609 and sequentially output to obtain a compression coded sequence 608.

Also, the encoder controller 603.
Outputs, as the prediction mode signal 609, a signal indicating the stop of coding and a signal indicating the restart of coding. When the prediction mode signal 609 is a signal indicating the stop of coding, intra-frame coding is performed. The device 604 receives the coding parameters 618, the forward frame predictive encoder 605 receives the coding parameters 619, and the bidirectional frame predictive encoder 6
06 sends the coding parameters 620 to the coding parameter holder 616, where they are stored.

Coding parameters 618, 619, 620
As described above, for example, whether the mode that was being encoded when the encoding was stopped is intraframe encoding, forward frame predictive encoding, bidirectional frame predictive encoding, or even further. , Which block was being processed, the discrete cosine transform coefficient, the Q parameter (quantization step), the activity, the quantization parameter, the temporary reference in the GOP, the reference frame interval, the motion vector, and the stopped frame. Generated code amount, generated code amount from the start of encoding to the present, MPEG
Refers to the parameters required for continuous normal encoding such as the simulation value of the video buffer verifier in 2 standards, screen size, etc. In the case of a necessary image, the number of the reference image in the reference image memory, etc. for maintaining the encoding continuity is also an encoding parameter. When the input video signal is a video obtained by performing telecine conversion on the film source and the inverse 32 conversion is performed at the time of encoding before the cutoff, the pattern of the inverse 32 conversion is also held and it is as if the input signal is a continuous signal. It should be done as if.

When the prediction mode signal 609 is a signal indicating the resumption of coding, the coding parameter holder 616 is provided.
To the intraframe encoder 604, the forward frame predictive encoder 605, and the bidirectional frame predictive encoder 606,
The coding parameter held at each stop is output as the coding parameter 617.

During the above operation, the frame number detector 6
The detection result of No. 10 is also sent to the end frame detector 613, and as described above, the end frame detector 613 holds the number of frames N. When the number of frames reaches this number N, the end instruction signal is sent. 615 is switched from, for example, “0” to “1” and the switches 612 and 607 are turned off.
F, and the end instruction signal 615 is also sent to the encoder controller 603 to end the encoding.

FIG. 14 shows a timing chart of input signal switching by the encoding processing of the ninth embodiment. In the ninth embodiment, the first input terminal, that is, the input video signal 6
The video output of the first tape is connected to 01, and the video output of the second tape is connected to the second input terminal, that is, the input video signal 621, and the necessary video signal is
Up to the X1 (X1 is a natural number) frame of the first tape, from the first frame of the second tape to X2 (X2
Is a natural number) to the 3rd frame, X3 of the 1st tape
From the (X3 is a natural number) th frame to the X4 (X4 is a natural number) th frame, and X5 of the second tape
It is assumed that the video signal is after the (X5 is a natural number) frame and the total number of frames to be encoded is N frames.

At the beginning of encoding, the input side of the switch 612 is switched to the input video signal 601 side. At this time, the external input switching signal 614 is "0".
And After that, the tape of the first roll is reproduced, and the frames input from the input video signal 601 side are encoded by the frame number detector 610 until a total of X1 frames is reached.

That is, the switching frame detector 611 is
The number of input frames of the frame number detector 610 is detected to be X1, and the input switching signal 614 is changed from “0” to “1” at the X1 + 1th frame, so that the input side of the switch 612 is input. The signal 601 side is switched to the input video signal 621 side. After that, the switching frame detector 61 is reproduced from the beginning of the second tape.
1 indicates that the number of input frames of the frame number detector 610 is X1 +
By detecting that X2 has been reached and changing the input switching signal 614 from "0" to "1" in the X1 + X2 + 1th frame, the input side of the switch 612 is changed from the input video signal 621 side to the input video signal 601 side. Switch.

Thereafter, the tape of the first roll is reproduced from the X3 frame, and the reproduction signal of the first roll, that is, the input video signal 60 is reproduced.
While 1 is being input, for example, the time code of the X4th frame is "HH time MM minutes SS seconds FF frame" (for example, HH is an integer of 0 or more and 24 or less, MM and SS are 0 or more and 59 or less). , And FF is an integer of 0 or more and 29 or less.), The time code “HH time MM minute SS second FF” recorded with the video signal on the tape by an external circuit (not shown). "Frame" is detected, and the external input switching signal 622 is changed from "0" to "1".
Then, the switching frame detector 611 detects the frame synchronization signal of the X4 + 1th frame from the output signal of the frame number detector 610, and switches the input switching signal 614 from “0” to “1” The input side of the device 612 is switched from the input video signal 601 side to the input video signal 621 side. After that, reproduction is started from the X5th frame of the second tape, and the frames input from the input video signal 621 side are encoded by the end frame detector 613 until the total number of N frames is reached.

As a result, the X1 frame of the first roll, the first frame to the X2 frame of the second roll, the X3 frame to the X4 frame of the first roll, and the second roll The video signal connected to the video signals of the X5th frame and thereafter is coded, and is obtained as a compression coded sequence 608 for N frames in total. Therefore, even if a blackout frame or the like is written after the X + 1th frame of the first volume, such a frame is not included in the connection points of the first volume and the second volume.

The switching frame detector 611 is
The frame may be switched at a plurality of points in the input video signal.

Further, the intra-frame encoder 605, the forward frame predictive encoder 606, and the bidirectional frame predictive encoder 607 may start encoding with a frame synchronization signal.

The input video signal may be any number of two or more.

It is also assumed that one or more input video signals are input to the frame number detector 610 at the start of encoding.

Further, the timing at which the switching frame detector 611 detects the change in the external input switching signal 622 and then switches the switching unit 612 does not necessarily have to be after the Xth frame has been input for all lines. It may be any time until the frame synchronization signal of the (X + 1) th frame of the compression coded sequence 608 is input. For example, it may be switched in synchronization with the horizontal synchronization signal S (S is a natural number) ahead, may be switched in synchronization with the vertical synchronization signal, may be switched at the time of detection, and may be switched in pixel units. Good. Thus, the Xth frame can be a frame composed of two or more frames.

The external input switching signal 622, the input switching signal 614, and the end instruction signal 615 are not necessarily signals of "0" and "1", and may be any signal of 1 bit or more. Further, the external input switching signal 622 does not have to be discriminated by the time code, but may be a manual input or a discrimination result of a special signal representing a connection point recorded in the vertical blanking of the video signal. However, the determination result may be a transition or a break of the audio signal, and a predetermined image such as a color bar, a blue background, or a blackout image may be discriminated and switched, and a signal capable of discriminating a connection point may be used. Anything is fine.

Further, the switching frame detector 611 may be switched every time the state of the external input switching signal 622 is switched. For example, the external input switching signal 622 is switched from "0" to "1". The switching may be performed only with a specific pattern.

It is also possible to replace the reproduction media connected to another terminal while encoding a certain input signal.

According to the ninth embodiment, a plurality of input video signals are switched and input, and the video signals are coded using the same coding parameters before and after the switching of the input video signals. Since it is done, it is possible to obtain a compression encoded output as if the video signals are continuous for the switching selection input of different video signals, and for multiple playback signals from several types of media. Thus, it is possible to carry out editing by compression encoding in which the reproduction signal is switched at any time.

[0140]

As described above, the first to eighth aspects of the present invention are as follows.
According to the video encoding device according to the embodiment of the above, the encoding stop state is created in a certain frame of the video signal, and after a predetermined time,
Alternatively, in response to external input or the like, by restarting the encoding by using the same encoding parameter as when the above encoding is stopped, it is possible to reproduce a continuous image for a plurality of reproduced image signals from several kinds of media. The compression encoding can be performed as if the signal is being input, and the stream editing can be performed as if for a continuous video signal.

Further, according to the ninth embodiment of the present invention, by providing some input terminals for a video signal, switching the video signal at a certain frame and restarting the encoding of another video signal. , It is possible to compress and encode multiple playback video signals from several media as if continuous video signals were input, and stream editing as if for continuous video signals. It can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a video encoding device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a video encoding device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a video encoding device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a video encoding device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a video encoding device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing the configuration of a video encoding device according to a ninth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a predetermined pattern determination unit 522 of a video encoding device according to a fifth embodiment of the present invention.

FIG. 8 is a timing diagram of compression encoding in the video encoding device according to the first embodiment of the present invention.

FIG. 9 is a timing diagram of compression encoding in the video encoding device according to the first embodiment of the present invention.

FIG. 10 is a timing diagram of compression encoding in the video encoding device according to the second embodiment of the present invention.

FIG. 11 is a timing diagram of compression encoding in the video encoding device according to the third embodiment of the present invention.

FIG. 12 is a timing chart of compression encoding in the video encoding device according to the fourth embodiment of the present invention.

FIG. 13 is a timing diagram of compression encoding in the video encoding device according to the fifth embodiment of the present invention.

FIG. 14 is a timing diagram of input signal switching in the video encoding device according to the ninth embodiment of the present invention.

FIG. 15 is a configuration diagram of a video encoding device according to a seventh embodiment of the present invention.

FIG. 16 is a configuration diagram of a video encoding device according to an eighth embodiment of the present invention.

FIG. 17 is a configuration diagram of a video encoding device according to a sixth embodiment of the present invention.

FIG. 18 is a configuration diagram showing a video encoding device according to a conventional example.

FIG. 19 is a diagram illustrating a method of stream editing by a conventional video encoding device.

[Explanation of symbols]

101,201,301,401,501,601,6
21,701 Input video signal 102,107,202,207,302,307,4
02,407,502,507,603,608,61
4 Switcher 103, 203, 303, 403, 503, 603 Encoder controller 104, 204, 304, 404, 504, 604 In-frame encoder 105, 205, 305, 405, 505, 605 Forward frame Predictive encoder 106, 206, 306, 406, 506, 606 Bidirectional frame predictive encoder 108, 208, 308, 408, 508, 608 Compressed coded sequence 109, 209, 309, 409, 509, 609 Predictive mode Signal 110, 210, 310, 410, 510, 610 frame number detector 111, 211, 311, 411, 511 stop frame detector 112, 212, 312, 412, 512 switch 113, 213, 314, 413, 513, 613 End frame detector 313, 413, 51 3 External signal 114, 214, 315, 415, 514, 614 Input switching signal 521, 704 Judgment result 522 Predetermined pattern judging device 523 Delay device 612 Switching frame detector 622 External input switching signal 115, 215, 316, 415, 515 615 End instruction signal 702 Predetermined level 703 Predetermined level comparator 705 Judgment result accumulator 706 Cumulative value 707 Vertical sync signal extractor 708 Extraction result 709 Black level threshold 710 Black level threshold comparator 711 Blackout discriminator 132 Time code generation means 134 Generated time code 133 Time code stack 135 Compression coded sequence in which time code is embedded 151 Screen size detector 152 Reference frame 153 Reference pixel 154 Screen size changer 155 Screen size Memory 160 screen size detector 160a screen size detector output 162 screen size memory 163 Screen Size 164 switch

Claims (11)

[Claims] 1. A video coding apparatus for compressing and coding a video signal for recording and transmission, wherein switch means for passing or blocking an input video signal, and for the video signal passed through the switch means, Encoding means for performing compression encoding and outputting a compression encoded sequence, and when detecting a stop frame in which encoding of the input video signal should be stopped, the switch means is shut off and the encoding means Stop frame detection means for outputting a control signal for stopping the encoding operation, and an encoding parameter holding means for holding the encoding parameter generated at the time of encoding by the encoding means, the encoding means, The coding of the input video signal is stopped when the input of the video signal is interrupted, and the coding parameter is stopped when the input of the video signal is restarted. Video encoding apparatus, characterized in that based on the same coding parameters as when the user stops the coding held in over data holding means is to resume the encoding of video signals. 2. The video encoding device according to claim 1, wherein the stop frame detection means outputs the control signal for a predetermined period after detecting a stop frame at which input of a video signal should be stopped. A video encoding device characterized by being a thing. 3. The video encoding device according to claim 1, wherein the stop frame detecting means outputs the control signal in response to an external signal synchronized with the video signal. Video coding device. 4. The video encoding device according to claim 1, wherein the stop frame detecting means outputs the control signal in accordance with a time code which is synchronized with the video signal and which is recorded together with the video signal. A video encoding device characterized by being a thing. 5. The video encoding device according to claim 1, wherein the stop frame detection means outputs the control signal at a timing synchronized with the video signal in response to a signal generated by manual input. A video encoding device characterized by being a thing. 6. The video encoding device according to claim 3, wherein the external signal synchronized with the video signal is an audio signal recorded together with the video signal, and the signal level of the audio signal is equal to or higher than a predetermined level. The image coding apparatus, wherein the stop frame detection means outputs the control signal when the determination means determines whether or not there is. 7. The video encoding device according to claim 1, wherein the stop frame detection means determines that the input video signal has a predetermined video pattern by a means that determines whether the input video signal has a predetermined video pattern. A video encoding apparatus, which outputs the control signal when the video signal is output. 8. The video coding apparatus according to claim 1, wherein the means for detecting the screen size of the input image signal, the means for holding the screen size of the input video signal when the coding is stopped, and the means for restarting the coding And a means for changing the reference image for encoding of the input image signal to the same screen size as that of the input video signal at the time of restarting the encoding. A video coding device, characterized in that coding is performed by changing the screen size of the input video signal when the coding is restarted. 9. The video encoding device according to claim 1, wherein the means for detecting the screen size of the input image signal, the means for holding the screen size of the input video signal when the encoding is stopped, and the means for restarting the encoding Means for changing the input video signal of to the screen size of the reference image at the time of encoding stop, and when the encoding is restarted, the input video signal is changed to the screen size of the input video signal at the time of encoding stop. A video encoding device, characterized in that it is changed to perform encoding. 10. The video coding apparatus according to claim 1, wherein a time code generating unit that self-generates a time code at the time of coding by the coding unit, and a compression coding created by the coding unit. Means for embedding the self-generated time code in a sequence, wherein the time code generating means, when the encoding is stopped,
A video coding apparatus, wherein a time code generated at the time of encoding is also stopped and a time code continuous with the time code at the time of encoding stop is generated when encoding is restarted. 11. A video encoding device for compressing and encoding video signals for recording and transmission, and switching means for switching and inputting a plurality of input video signals according to an input switching signal, and the switching. The input video signal should be switched from the video signal that has been input through the switching means and the compression means that performs compression encoding on the video signal that has passed through the means and outputs a compression encoded sequence. A switching frame detecting means for outputting the input switching signal, and an encoding parameter holding means for holding an encoding parameter generated at the time of encoding by the encoding means. After switching by the means, the same encoding parameter as before switching the input video signal held in the above-mentioned encoding parameter holding means Used, the video encoding apparatus, characterized in that performs a coding of an input image signal.