JP2001128168A - Video signal encoding / decoding device - Google Patents

Abstract

(57) [Summary] [Problem] To easily compare the image quality of a video with a signal before encoding and a video with a signal after decoding. SOLUTION: A video receiving means for receiving an input digital video signal, a video converting means for converting an input analog video signal into a digital video signal, and a video output means for outputting one of the two digital video signals. 1 signal switching means, compression encoding means for performing compression encoding on the digital video signal output from the first signal switching means, and expansion decoding for expanding and decoding the compression encoded signal. Means for switching and outputting the decompressed signal and the digital video signal from the first signal switching means.
And an output means for outputting the output from the second signal switching means from one signal output unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus having a video encoder and a decoder.

[0002]

2. Description of the Related Art FIG. 11 shows a conventional encoding and decoding apparatus for encoding / decoding a video signal. Consider a case in which image quality evaluation based on encoding conditions is performed in apparatus 100 having video encoding and decoding. The image quality evaluation has been performed on a video in which an output signal from the video source 30 is input to the input video monitor 31 and digital data of one system of input video. Here, the digital data of the input video of one system is, for example, data obtained by adjusting the signal level by the amplifier circuit 2 and converting the digital data by the A / D conversion circuit 3 when the analog video is input to the device 100. Is encoded by the encoding circuit 4 (hereinafter, encoding)
Further, the decoding circuit 5 performs decompression decoding (hereinafter, decoding) of the encoded data, and the video output from the output circuit 6 (hereinafter, real-time decoded video) is input to the output video monitor 32. Refers to images. Then, the quality of the image displayed on each monitor is compared. In addition, the coding conditions have been reviewed based on the evaluation results, and the image quality has been optimized.

[0003]

However, the input video 30a and the real-time decoded video are input to the input video monitor 31 and the output video monitor 32, respectively.
When the image quality is evaluated using two monitor televisions, it is not possible to accurately compare the deterioration of the image quality or the like due to individual differences between monitors. Also, when evaluating the image quality, even if the comparison is performed using two monitors, or two images are displayed by switching the input on one monitor, and the comparison is performed, the comparison image is displayed on the same screen. Is not displayed, so that accurate comparison cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to convert a video signal input to an apparatus and a coded and decoded video signal into a signal switching circuit. , And by controlling this signal switching circuit, both video signals are output from an output circuit having one output section, and the video signal before being encoded is encoded and decoded. It is an object of the present invention to make it easier to compare the two video signals when evaluating the image quality of the video signal after the video signal has been processed.

[0005]

According to a first aspect of the present invention, there is provided a video signal encoding / decoding apparatus which receives an input digital video signal, converts an input analog video signal into a digital video signal. A video converting means for converting, a first signal switching means for selecting and outputting one of the digital video signals output from the video receiving means or the video converting means, and a first signal switching means. Compression encoding means for performing compression encoding on the output digital video signal; expansion decoding means for extending and decoding the digital video signal which has been compression-encoded by the compression encoding means; Second signal switching means for switching and outputting the digital video signal decompressed and decoded by the means and the digital video signal output from the first signal switching means; It is obtained and output means for outputting the output from the second signal switching means from one signal output unit.

In the video signal encoding / decoding device according to a second aspect of the present invention, the second signal switching means switches the signal output at a predetermined timing, so that the compression code output from the first signal switching means is switched. The digital video signal before being decoded and the decoded digital video signal output from the decompression decoding means are sequentially output.

In the video signal encoding / decoding device according to the third invention, the second signal switching means switches the signal output at a predetermined timing obtained based on the synchronization signal, thereby providing a signal output. Before was switched,
One of a digital video signal before compression encoding output from the first signal switching unit and a decoded digital video signal output from the expansion decoding unit is output, and the signal output is switched. After that, the other signal different from the signal output before the signal output switching is output.

In the video signal encoding / decoding device according to a fourth aspect of the present invention, the second signal switching means starts counting based on the horizontal synchronizing signal and starts counting when the count value reaches a predetermined value. And a timing signal generating means for outputting a timing signal for switching the signal output.

In the video signal encoding / decoding device according to a fifth aspect of the present invention, the second signal switching means starts counting based on the vertical synchronizing signal and starts counting when the count value reaches a predetermined value. And a timing signal generating means for outputting a timing signal for switching the signal output.

A video signal encoding / decoding device according to a sixth aspect of the present invention includes recording means for recording the compression-coded video data output from the compression coding means.

In a video signal encoding / decoding apparatus according to a seventh aspect, the video conversion means includes adjustment means for adjusting the image quality of the video signal.

[0012] In the video signal encoding / decoding device according to the eighth invention, the compression encoding means and the decompression decoding means use the redundancy in the time direction such as frame difference or frame prediction, field difference or field prediction. Characterized in that a compression encoding method and a decompression decoding method are used.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of an encoding / decoding device according to Embodiment 1 of the present invention. In the figure, 1 is an encoding / decoding device,
1a is an analog video input connector, 1b is a digital video input connector, 1c is an output connector, 2 is an amplifier circuit, 3 is an A / D conversion circuit, 4 is an encoding circuit, 5 is a decoding circuit, 6 is an output circuit, 7a is a first output switching circuit, 7b
Denotes a second output switching circuit, 8 denotes a signal before encoding, 9 denotes a decoded signal output from the decoding circuit 5, 10 denotes a receiver circuit to which a digital video signal is input from a digital video input connector, and 40 denotes an analog signal. An analog video signal input from the video input connector 1a is a digital signal converted and output by the A / D conversion circuit 3, and 41 is a receiver circuit 1.
This is a digital signal output from 0.

Next, the operation will be described. The analog video signal input from the analog video input connector 1a is
The input signal level is adjusted by the amplifier circuit 2. The analog video signal whose input signal level has been adjusted is converted into a digital signal 40 by the A / D conversion circuit 3. If the input signal is a digital video signal, it is input to the digital video input connector 1b. Digital video input connector 1
b is input to the receiver circuit 1
After receiving the signal at 0 and extracting the synchronization signal, a digital signal 41 is output from the receiver circuit 10. The encoding / decoding device 1 may receive either an analog video signal or a digital video signal, or may simultaneously receive both an analog video signal and a digital video signal from a video source such as a VTR. .

The two digital signals 40 and 41 from the input connectors 1a and 1b are supplied to a first output switching circuit 7a.
, One of the signals is selected, and one system of digital data is output. Encoding / decoding device 1
When two analog video signals and digital video signals are input, either the analog video signal or the digital video signal may be selected, and the user may select a desired signal. The data output from the first output switching circuit 7a is input to the encoding circuit 4, and the signal from the first output switching circuit 7a is converted into a signal 8 before encoding by a second output switching circuit 7a. 2 is input. The digital data input to the encoding circuit 4 is input to the decoding circuit 5 after being encoded and decoded, and then input as the decoded signal 9 to the second output switching circuit 7b.

The signal 8 before decoding and the decoded signal 9 input to the second output switching circuit 7b are output from the second output switching circuit 7b.
Thus, either one of the signals is selected and output from the output connector 1c via the output circuit 6. The digital video signal output from the second output switching circuit 7b is output from the output circuit 6
And outputs a digital video signal from an output circuit 6 constituting a driver circuit. When an analog video signal is output from the output connector 1c, the output circuit 6 constitutes a D / A conversion circuit, D / A converts a digital video signal input to the output circuit 6, and outputs an analog video signal. Note that the output circuit 6 may have both functions of a driver circuit and a D / A conversion circuit.

As described above, since the encoding / decoding device 1 is provided with the second output switching circuit 7b, the signal 8 before encoding is output.
By switching and outputting two signals of the decoded signal 9, it is possible to output a signal to a signal output unit having one signal output unit.

Embodiment 2 FIG. Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 2 shows an output signal from the output switching circuit 7b of the encoding / decoding device 1 shown in FIG.
3 shows a configuration for supplying to a system output means. Here, one system of output means refers to output means having one output unit for outputting a signal. In the figure, reference numeral 30 denotes a video source such as a VTR (Video Tape Recorder);
0a is an input video output from the video source 30 and input to the monitor, 30b is an analog input video input to the analog video input connector 1a, 30c is a digital input video input to the digital video input connector 1b, and 31 is an input video A monitor 32, an output video monitor for displaying an output video from the output connector 1c; 33, a control for controlling the first output switching circuit 7a and the second output switching circuit 7b of the encoding / decoding device 1; A control unit that outputs a switching signal, and 33a is a first unit from the control unit 33
Is a control signal for controlling the output switching circuit 7a, and 33b is a control signal for controlling the second output switching circuit 7b from the control unit 33. The other internal configuration is the same as that of the encoding / decoding device 1 shown in FIG.

For example, when judging image quality degradation due to encoding conditions, the signal 8 before decoding and the decoded signal 9 are output from one system output connector 1c for outputting a signal from the encoding / decoding device 1 to the outside. A control signal 33b is transmitted from the control unit 33 to the second output switching circuit 7b so that the signals are sequentially switched and output. In this manner, two types of signals, that is, the signal 8 before being encoded and the decoded signal 9 can be output from the output connector 1c via the output circuit 6. If the output signal is displayed on the output monitor 32 by appropriately switching the second output switching circuit 7b, an image composed of two types of signals, that is, the signal 8 before being encoded and the decoded signal 8, is sequentially displayed. be able to. Therefore, by comparing the image based on the coded signal sequentially displayed on the monitor 32 with the image based on the decoded signal, it is possible to easily determine the deterioration of the image quality due to the coding condition. In addition, since the two types of video signals are displayed on the same monitor, they are not affected by individual differences between monitors, so that image quality can be more accurately evaluated.

Embodiment 3 Embodiment 3 of the present invention will be described with reference to the drawings. FIG. 3 shows a configuration in which an adjustment circuit 11 is added to the encoding / decoding device 1 shown in FIG. In the figure, reference numeral 11 denotes an adjustment circuit for adjusting the image quality of a video signal, and is a circuit for adding a filter function to an input video and adjusting contrast, hue, brightness and the like.

Hereinafter, the operation will be described. The input video signal 30 b input from the video source 30 is adjusted in signal level by the amplifier circuit 2, adjusted by the adjustment circuit 11, converted to a digital video signal by the A / D conversion circuit 3, and converted to a first video signal. The signal is input to the output switching circuit 7a. Subsequent signal processing is the same as in the second embodiment.

When the encoding / decoding device 1 including the adjustment circuit 11 adjusts the image quality or the like of the input video signal 30b by the adjustment circuit 11, the analog video input connector 1
The control unit 33 sets the output switching signal 33a so that the signal input from the control unit 33 is output from the first output switching circuit 7a. Further, the second output switching circuit 7
From b, an output switching signal 33b is set from the control unit 33 so as to output the signal 8 before encoding.
As a result, the effect of the adjustment performed by the adjustment circuit 11 can be displayed on the output video monitor 32, and by comparing the effect of the adjustment with the video of the input video monitor 31, the degree of adjustment for the input video signal 30b can be immediately compared. Can be optimized immediately.

Embodiment 4 Embodiment 4 of the present invention will be described with reference to the drawings. In the present embodiment, a method using temporal redundancy in encoding and decoding of the encoding circuit 2 and the decoding circuit 5 of FIG. 1, for example, MPEG-2 (Moving
Picture Experts Group phase 2) The encoding / decoding device 1 adopting the standard will be described. FIG. 4 shows a frame configuration of video data when encoding and decoding are performed using MPEG-2.

In MPEG-2, an I picture (Intra Picture)
/ Picture (Predicive Pi)
cture / sequential direction prediction video), B picture (Biderection
Three video types (allPicture / bidirectional prediction coded video) are defined, and encoding is performed using bidirectional prediction, so that a time delay occurs. For example, the frame configuration when encoding is performed with an I picture interval of 15 (N = 15) and an I picture and P picture interval of 3 (M = 3) is as shown in FIG. In this case, B of frame number 4
In order to realize the picture, the picture is generated only after the P picture of the frame number 6 generated from the I picture of the frame number 3 is generated. For this reason, when generating encoded data, there is a delay of at least three frames with respect to a real-time video. Since the decoding has the same structure, the decoding delay also has three frames. In other words, the delay in encoding and decoding is NTSC
(National Television System Committee), at least 6 frames (200 ms) will occur.

As described above, when MPEG-2 is adopted for encoding and decoding, the signal 8 before decoding and the decoded signal 9 are delayed by at least 200 ms, so that the second output switching circuit 7b If the output is switched and output, the monitor 32
Then, after watching the video based on the signal 8 before encoding, it is possible to view the video based on the decoded signal that is output after being delayed (this is the video having the same content as the video based on the signal before encoding), It is possible to compare image quality degradation due to encoding conditions. The description has been given of the case where the MPEG-2 standard is adopted for encoding and decoding.However, the present invention is not limited to this, and any encoding and decoding method using redundancy in the time direction may be used. The effect is obtained.

Embodiment 5 Embodiment 5 of the present invention will be described with reference to the drawings. FIG. 5 is a diagram showing a detailed configuration of the second output switching circuit of the encoding / decoding device according to Embodiment 5 of the present invention. In FIG. 5, the signal 8 before decoding and the decoded signal 9 are divided in a frame, a field, or a line, and the divided signal 8 before decoding and the decoded signal 9 are mixed to form one frame. A circuit for reconstructing a signal of one field or one line is shown.

In the figure, reference numeral 20 denotes a comparison reference value, 21 denotes a counter circuit, 22 denotes a comparator, 23 denotes a changeover switch, and 24 denotes a switch.
Is a synchronization signal, 25 is a counter value output from the counter 21, 26 is a switching signal determined from the counter value 25 and the comparison reference value 20, and 27 is an external clock. Switching signal 2
Reference numeral 6 denotes a timing signal for switching a signal output from the second output switching circuit 7b.

The operation will be described below. First, the first output switching circuit 7b is connected to the second output switching circuit 7b.
a and the decoded signal 9 output from the decoding circuit 5, and extracts a synchronizing signal 24 synchronized from either one or both signals. I do. After resetting the counter value with the synchronization signal 24, the counter 21 starts counting up with the external clock 27. The comparator 22 compares the input counter value 25 with a preset reference value 20. Then, when the counter value 25 reaches the comparison reference value 20, a switching signal 26 is generated and input to the switch 23. The changeover switch 23 divides the signal 8 before decoding and the decoded signal 9 in a frame, a field, or a line, respectively, and mixes the divided signal 8 before decoding and the decoded signal 9 into one frame or Data is generated so as to reconstruct a video signal of one field or one line, and is output from the second output switching circuit 7b. Note that the comparison reference value is the control unit 33.
The same effect can be obtained even if the setting is made by the control signal 33b.

FIG. 6 shows a signal 8 before encoding and a decoded signal 9
Is an example of a switching signal for dividing and mixing in a line to reconstruct one line. In the figure, reference numeral 24a denotes a horizontal synchronization signal. Hereinafter, the configuration of the output switching circuit 27b will be described with reference to FIGS. The counter 21 resets the counter value with the horizontal synchronizing signal 24a and compares the counter value 25 counted up with the external clock 27 with the comparator 2.
Enter 2 In the comparator 22, the switching signal 26 is set to High (26a) during a period when the counter value 25 is smaller than the preset comparison reference value 20, and during the period when the counter value 25 is higher than the comparison reference value, the switching signal 26 is set to Low ( 26b). The changeover switch 23 receives the input changeover signal 2
6, the line of the signal 8 before decoding and the line of the decoded signal 9 displayed in the section divided by 26a and 26b are selected, and one line is reconstructed by each signal. As described above, the switching of the signal output from the second output switching circuit 7b is performed within one horizontal synchronization signal period, so that the video by the signal before encoding and the signal after decoding is displayed in one line. can do. Note that the output switching by the second output switching circuit may be performed a plurality of times (preferably an odd number) within one horizontal scanning period.

FIG. 7 shows the structure of an image displayed on the output image monitor 32a when one line is reconstructed by the switching signal 26 shown in FIG. For example, the switching signal 26a is
The video output section before encoding, 26b is the decoded video output section, and の of the maximum value of the counter value 25 is the comparison reference value 2
When set to 0, the switching position 28 is located at the center of the display screen 32a of the video monitor. From the switching position 28, the left screen displays the video before encoding, and the right screen displays the decoded video.
(On the screen, half of the video before encoding and half of the decoded video are displayed.)

FIG. 8 shows an example of a switching signal when the signal 8 before decoding and the decoded signal 9 are divided and mixed in a frame or a field, respectively, to reconstruct one frame or one field. Show. FIG. 9 shows a configuration of a video displayed on the output video monitor 32b when a video is reconstructed in a frame or a field using the signal set in FIG. In this case, a vertical synchronization signal 24b is input as the synchronization signal 24. The counter 21
When the counting is performed based on the vertical synchronization signal 24b and the half of the maximum value of the counter value 25 is set as the comparison reference value 20, the switching position 28 is located at the center of the display screen 32b of the video monitor. The upper screen is the video before encoding,
The lower screen displays the decoded video. Therefore, when the counter value reaches the comparison reference value 20, the switching signal 26, which is a timing signal for switching the output of the second output switching circuit 7b, changes from High to Low, and the output signal from the second output switching circuit 7b Signal to be switched. As a result, as shown in FIG. 9, two images are displayed on the screen, namely, an image based on the signal before encoding and an image based on the signal after encoding.

Although the case where the comparison reference value 20 is set to 1/2 of the maximum of the counter value 25 has been described, each switching position can be set by setting the comparison reference value 20 to a desired value. The position can be set freely.

As described above, the signal 8 before decoding and the decoded signal 9 are divided in a frame, a field, or a line, respectively, and the divided signals are mixed to form one frame, one field, or one frame. By reconstructing the video signal of the line, within the same screen,
Each signal can be displayed, and evaluation of image quality degradation due to encoding conditions can be easily performed.

When the encoding / decoding device 1 is provided with image adjustment means such as contrast, hue, brightness, etc., the signal 8 before encoding adjusted by the adjustment circuit 11 and the signal 8 before adjustment are included in the same screen. Since the decoded signal 9 is displayed, the image quality can be evaluated without being affected by the individual difference of the monitor.

Also, since the encoding and decoding uses a method utilizing the redundancy in the time direction, the signal 8 before encoding and the signal 9 after decoding with a delay are displayed in the same screen. Therefore, it is possible to easily evaluate the deterioration of the image quality due to the encoding conditions.

Embodiment 6 FIG. Embodiment 6 of the present invention will be described with reference to the drawings. FIG. 10 shows a configuration of an apparatus having a system for recording an encoded signal in a storage device in addition to a system for decoding the encoded signal. In the figure, 35 is a bus A of the control unit 33, 36 is a bus B,
Reference numeral 34 denotes a storage device connected through the bus B, for example, a hard disk drive (hereinafter, referred to as an HDD).
The configuration up to the encoding circuit 4 is the same as in FIG.

The data of the digital video signal encoded by the encoding circuit 4 is controlled by the control unit 33 via a bus A35, and transmitted to the HDD via a bus B36.
17 is recorded. The encoded data is transferred to the decoding circuit 5 via the bus A to generate a decoded signal 9. Further, control signals 33a and 33b for controlling the first output switching circuit 7a and the second output switching circuit 7b output from the control unit 33 are transmitted via the bus A35, and the first output switching circuit 7a The output of each of the second output switching circuits 7b is switched. According to the above configuration, the encoded data is recorded in the HDD 34 (storage device), and the signal 8 before decoding and the decoded signal 9 can be appropriately switched and output from the output connector 1c.

[0038]

According to the first invention, a video receiving means for receiving an input digital video signal, a video converting means for converting an input analog video signal into a digital video signal, the video receiving means, Alternatively, a first signal switching means for selecting and outputting one of the digital video signals output from the video conversion means, and a compression code for the digital video signal output from the first signal switching means. Compression encoding means for performing the encoding, expansion decoding means for expanding and decoding the digital video signal compressed and encoded by the compression encoding means, and the digital video signal expanded and decoded by the expansion decoding means A second signal switching means for switching and outputting a digital video signal output from the first signal switching means, and one output from the second signal switching means Because and output means for outputting the signal output section, it is possible to output from one output switches the signals after decoding the encoded signal before,
The video based on the signal before encoding and the video based on the signal after decoding can be sequentially displayed on a display device, for example. Can be easily compared.

According to the second aspect, the second signal switching means switches the signal output at a predetermined timing, so that the digital video signal before compression encoding output from the first signal switching means is output. And the decoded digital video signal output from the decompression decoding means are sequentially output, so that both the video by the signal before compression encoding and the video by the signal after decompression decoding are displayed on the same screen. , It is possible to easily compare the deterioration of the image quality due to the encoding conditions with the signal before encoding.

According to the third invention, the second signal switching means switches the signal output at a predetermined timing obtained based on the synchronization signal, so that the first signal switching is performed before the signal output is switched. Output either the digital video signal before compression encoding output from the signal switching unit or the decoded digital video signal output from the expansion decoding unit, and after the signal output is switched Outputs the other signal different from the signal output before the signal output switching, so that the same image of the signal before being encoded and the image of the signal after being decoded are displayed on the same screen of the display device. Can be displayed, and comparison of deterioration of image quality due to encoding conditions and the like can be easily performed.

According to the fourth aspect, the second signal switching means starts counting based on the horizontal synchronization signal, and the count value reaches a predetermined value set within one horizontal synchronization signal period. At this point, since a timing signal generating means for outputting a timing signal for switching a signal output is provided, the right and left sides of the same screen of the display device are provided with a video by an encoded signal and a video by a decoded signal. An image can be displayed, and comparison of image quality deterioration due to deterioration conditions can be easily performed.

According to the fifth aspect, the second signal switching means starts counting based on the vertical synchronizing signal, and the count value becomes a predetermined value set within one vertical horizontal synchronizing signal period. At the time of reaching, since it has a timing signal generating means for outputting a timing signal for switching the signal output, the upper and lower sides of the same screen of the display device, the video by the encoded signal and the decoded An image based on a signal can be displayed, and comparison of image quality deterioration due to deterioration conditions can be easily performed.

According to the sixth aspect, since the recording means for recording the compression-encoded video data output from the compression-encoding means is provided, the decoded signal can be recorded and the encoded signal can be recorded. The image quality of the video based on the decoded signal and the video based on the decoded signal can be easily evaluated.

According to the seventh aspect, the video converting means includes the adjusting means for adjusting the image quality of the video signal.
The image quality of the input analog video signal can be easily adjusted, and the signal after adjustment and the signal before adjustment can be easily compared.

According to the eighth aspect, the compression encoding means and the decompression decoding means use the compression encoding method utilizing the redundancy in the time direction, such as frame difference and frame prediction, field difference and field prediction, and the like. Since the video based on the signal before encoding and the video based on the signal after decoding are displayed in the same video with a time delay, the image quality can be easily evaluated. it can.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an encoding / decoding device including an output switching circuit.

FIG. 2 is a diagram illustrating a configuration in which a signal switched by an output switching circuit is supplied to one system of output means.

FIG. 3 is a diagram illustrating a configuration of an encoding / decoding device including an output switching circuit and an adjustment circuit.

FIG. 4 is a diagram showing a group configuration in a screen by MPEG-2 encoding.

FIG. 5 is a diagram illustrating a configuration of a second output switching circuit.

FIG. 6 illustrates an example of a switching signal input to a second output switching circuit.

FIG. 7 illustrates an example of an output screen based on a signal output from a second output switching circuit.

FIG. 8 shows another example of the switching signal input to the second output switching circuit.

FIG. 9 illustrates another example of an output screen based on a signal output from a second output switching circuit.

FIG. 10 illustrates a configuration of an encoding / decoding device including a system for recording an encoded signal in a storage device.

FIG. 11 is a diagram showing a configuration of a conventional encoding / decoding device.

[Explanation of symbols]

1 encoding / decoding device, 1a analog video input connector, 1b digital video input connector, 1c output connector, 2 amplifier circuit, 3 A / D conversion circuit,
Reference Signs List 4 encoding circuit, 5 decoding circuit, 6 output circuit, 7a first output switching circuit, 7b second output switching circuit, 8 signal before encoding, 9 decoded signal, 10
Receiver circuit.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Noritaka Kishida 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5C059 KK47 LA00 LA01 MA00 MA01 PP05 PP06 SS11 UA02 UA05 5J064 AA01 BA13 BC02 BC06 BC25 BC30 BD03

Claims (8)

[Claims] 1. An image receiving means for receiving an input digital image signal, an image converting means for converting an input analog image signal into a digital image signal, and an image output from the image receiving means or the image converting means. First signal switching means for selecting and outputting one of the digital video signals; compression encoding means for performing compression encoding on the digital video signal output from the first signal switching means; A decompression decoding unit for decompressing and decoding the digital video signal compressed and encoded by the compression encoding unit; a digital video signal decompressed and decoded by the decompression decoding unit; and the first signal switching unit Signal switching means for switching and outputting a digital video signal output from the second device, and an output from the second signal switching means from one signal output unit. And a video signal encoding / decoding device. The second signal switching means switches the signal output at a predetermined timing, so that the digital video signal before compression encoding output from the first signal switching means and the decompression decoding means output from the expansion decoding means. 2. The method according to claim 1, wherein the output decoded digital video signals are sequentially output.
The video signal encoding / decoding device according to claim 1. 3. The second signal switching means switches the signal output at a predetermined timing obtained based on the synchronization signal, so that before the signal output is switched, the first signal switching means outputs the signal from the first signal switching means. Digital video signal before compression encoding
Alternatively, one of the decoded digital video signals output from the decompression decoding means is output, and after the signal output is switched, the other signal different from the signal output before the signal output switching is performed. 3. The video signal encoding / coding device according to claim 2, wherein
Decryption device. 4. The second signal switching means starts counting based on the horizontal synchronizing signal, and outputs a timing signal for switching a signal output when the count value reaches a predetermined value. 4. The video signal encoding / decoding device according to claim 3, further comprising a signal generation unit. 5. The second signal switching means starts counting based on a vertical synchronization signal, and outputs a timing signal for switching a signal output when the count value reaches a predetermined value. 4. The video signal encoding / decoding device according to claim 3, further comprising a signal generation unit. 6. The video signal encoding / decoding apparatus according to claim 1, further comprising recording means for recording the compression-encoded video data output from the compression encoding means. 7. The video signal encoding / decoding apparatus according to claim 1, wherein said video conversion means comprises an adjustment means for adjusting the image quality of the video signal. 8. The compression encoding means and the decompression decoding means use a compression encoding method and a decompression decoding method using time-direction redundancy such as frame difference and frame prediction, field difference and field prediction, and the like. The video signal encoding / decoding device according to claim 1, wherein: