JPH09284705A - Video signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain still image recording during recording of a moving image. SOLUTION: A dynamic image video signal outputted from a CCD video image sensor 3 is converted into a digital dynamic image video signal by an A/D converter 5, the signal is coded by an MPEG CODEC 11 or a JPEG CODEC under the control of a micro controller 9 and recorded by a recording circuit 10. Through the shutter operation of the user, when a shutter trigger is received from an input terminal 15, the micro controller 9 generates still image instruction information and the information is added to an image (frame) coded by the MPEG CODEC 11 or a JPEG CODEC as user data. In the case of reproducing a still image from the recording circuit 10, the user data are retrieved to extract the coded image to which the still image instruction information is added and the image is decoded by the MPEG CODEC 11 or a JPEG CODEC to reproduce the still image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal reproducing apparatus for compressing and recording a moving picture video signal or a still picture video signal and reproducing the same.

[0002]

2. Description of the Related Art Conventionally, an example of a camera device capable of recording a moving image and a still image is described in, for example, Japanese Patent Laid-Open No. 6-253251. This device uses a line memory for encoding a moving image and a frame memory for encoding a still image, so that each image can be data-compressed by the same compression circuit. Thus, at the time of recording a moving image, it is possible to secure the shooting speed without lowering the compression rate, and it is possible to eliminate the need for a huge data recording area.

The still image and moving image encoding methods are as follows:
International standards have already been established, so-called JPEG is ISO / IEC standard 10918-2 for still images, and so-called MPEG1 is ISO / IEC standard 11172-2, so-called M for moving images.
PEG2 is ISO / IEC standard 13818-2.

[0004]

By the way, the above-mentioned prior art is capable of recording a still image and a moving image with one camera device. However, the still image encoding and the moving image encoding are stored in a memory. Since it is used by switching, the still picture coding and the moving picture coding cannot be performed at the same time. Therefore, even if there is a scene that you want to record as a still image while recording a moving image, you must switch the mode from the moving image recording mode to the still image recording mode, and miss the photo opportunity that you want to leave as a still image. become.

Of course, even if there is a scene that is desired to be recorded as a still picture while operating in the moving picture recording mode, the moving picture recording is continued as it is, and then the moving picture is reproduced to retrieve the scene required as the still picture. Although it is possible to reproduce a still image, it takes a lot of time and labor and the convenience is significantly deteriorated.

An object of the present invention is to solve such a problem and not only to record a still picture and a moving picture, but also to record an arbitrary scene during the recording of a moving picture in the same manner as a normal still picture recording. Then, it is another object of the present invention to provide a video signal recording / reproducing device capable of reproducing it as a still image.

[0007]

In order to achieve the above object, the present invention provides a moving picture compression start instruction means, a still picture compression start instruction means, a moving picture compression circuit, a still picture compression circuit, and a recording circuit. To provide. Further, in order to realize a still image recording instruction during moving image recording, the presence or absence of the still image recording instruction signal in the control signal associated with the moving image code is indicated according to the instruction signal from the still image compression start instruction means. A circuit for creating a frame designation signal is provided. A circuit for detecting a frame designation signal included in the control information recorded along with the compressed moving image is provided during reproduction.

Further, according to the present invention, in order to realize a still image recording instruction during moving image recording, the time when the still image recording start instruction signal is generated is measured with time information used for moving image compression, and a compressed moving image is obtained. A separate recording circuit is provided. At the time of reproduction, a circuit for expanding and reproducing a corresponding frame from the compressed moving image signal according to the time information is provided.

Further, in order to expand the effect of the present invention,
An external video signal live input circuit, a microphone, and an external audio input circuit are provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a video signal recording / reproducing apparatus according to the present invention, in which 1 is a video signal recording / reproducing apparatus, 2 is a lens, 3 is a CCD image sensor, and 4 is an analog signal processing circuit. 5, A / D converter, 6 digital signal processing circuit, 7 D / A converter, 8 memory circuit, 9 microcontroller, 10 recording circuit, 1
1 is an MPEG encoding / decoding circuit (MPEG codec), 12 is
JPEG coding / decoding circuit (JPEG codec), 13 is an analog video signal output terminal, 14 is a digital signal input / output terminal, 15 is a shutter trigger input terminal, and 16 is a video coding start / stop instruction signal input terminal. Is.

In the figure, in this embodiment, in addition to a still image recording mode by JPEG coding (hereinafter referred to as JPEG recording mode) and a moving image recording mode by MPEG coding (hereinafter referred to as MPEG recording mode), It is possible to select a moving image recording mode (hereinafter, referred to as m-JPEG (motion JPEG) recording mode) that utilizes the encoding, and the selection of these recording modes is performed by an operation of a user by means not shown.

When the JPEG recording mode is selected and the user further operates a shutter (not shown), a shutter trigger is input from the input terminal 15. By this shutter trigger, the microcontroller 9 causes the CCD image sensor 3 to perform a still image capturing operation, and captures the optical image formed via the lens 2. In this JPEG recording mode, the CCD image sensor 3 picks up one non-interlaced image each time a shutter trigger is input. At this time, the microcontroller 9 operates the JPEG codec 12.

When the MPEG recording mode is selected and the user further instructs recording start by operating a means (not shown), a moving image recording start instruction signal is input from the input terminal 16. As a result, the microcontroller 9 causes the CCD image sensor 3 to perform a moving image capturing operation. In this moving image capturing operation, the CCD image sensor 3 continuously outputs the moving image signal of the standard system by the interlaced scanning such as the NTSC system, similarly to the conventional video camera. At this time, the microcontroller 9 operates the MPEG codec 11. When the user performs a stop operation, a moving picture coding stop signal is input from the input terminal 16, whereby the Mylok controller 9 stops the operations of the CCD video sensor 3 and the MPEG codec 11.

The CCD image sensor 3 is used in the m-JPEG recording mode.
Is operated in the same way as the JPEG recording mode to generate a moving picture video signal in which still images are continuous, and the JPEG codec 1
2 is operated to encode successive still images. Therefore, this recording mode is selected and the input terminal 16
When the moving image recording start instruction signal is input from the microcontroller 9, the microcontroller 9 operates the CCD image sensor 3 in non-interlaced scanning and also operates the JPEG codec 12 until the next moving image recording stop instruction signal is input.

The video signal output from the CCD video sensor 3 as described above is subjected to known processing such as gamma correction in the analog signal processing circuit 4, and then the A / D converter 5
Is converted into a digital video signal. This digital video signal is processed by the digital signal processing circuit 6,
A part of it is converted into an analog video signal by the D / A converter 7 and supplied from the output terminal 13 to a monitor (not shown).

Further, the microcontroller 9 takes in the digital video signal processed by the digital signal processing circuit 6 and stores it in the temporary memory circuit 8, and in the MPEG recording mode, it uses the MPEG codec 11 or JPEG.
In recording mode and m-JPEG recording, JPEG codec 12
The data is compressed by encoding using. The microcontroller 9 records the compression-coded video signal in a recording circuit 10 as a recording medium or supplies it from an input / output terminal 14 to an external device such as a personal computer.

When moving images are recorded in the MPEG recording mode or the m-JPEG recording mode, when the user operates the shutter to input a shutter trigger from the input terminal 15, the microcontroller 9 Still image instruction information is added to a predetermined compression-coded image of the moving image signal in accordance with the input timing of the shutter trigger.

Next, the encoding performed by the MPEG codec 11 and the addition of this still picture instruction information will be described.

FIG. 2 is a diagram showing the hierarchy of the MPEG code.
1A shows the sequence layer which is the highest layer, and FIG. 1B shows the GOP (Group of picture) layer one layer below.

The sequence layer is composed of an array of GOPs, a sequence header SH is added to the beginning of each GOP, and a sequence end code SEC indicating the end thereof is added to the end of the sequence layer.

The GOP layer is composed of I picture, P picture and B picture.
Three types of compression-encoded images of a picture are, for example,
Fifteen pieces are arranged in a predetermined order, and a GOP header GH is added to the head of each picture. The I picture is coded by utilizing intra-frame correlation and is independent by itself, and therefore, the I picture itself can decompress data by decoding. The P picture uses the correlation with the previous I or P picture,
This is based on so-called interframe forward predictive coding. The B picture is based on so-called bidirectional predictive coding, which utilizes the correlation with the I or P picture before and after the B picture. The picture of the GOP layer is composed of a picture layer one level lower than the picture layer, which is a slice layer in which the picture is subdivided, and the picture layer has a luminance signal of 1
The macro block has 6 × 16 pixels and the color difference signal is 8 × 8 pixels. Encoding processing is performed in units of this macroblock.

3A and 3B are diagrams showing MPEG encoding. FIG. 3A shows a sequence of original images (frames), and FIG. 3B shows a sequence of encoded images. The arrow indicates the correspondence between the original image and the encoded image. Each original image is indicated by the code of the corresponding encoded image.

When an original image is input as shown in FIG. 3 (a), 15 images are set as 1 GOP, and as shown in FIG. 3 (b), one original image is always I It is encoded into a picture. Here, the original image I1 is used.
Further, in GOP, every other two original images are encoded into P pictures. Here, it is assumed that the original images P1, P2, P3 and P4 are encoded into P pictures. Remaining original image B
0 to B9 are encoded into B pictures.

The original image I1 is I
It is encoded into a picture. Original images P1, P2, P3, P
4 is encoded into a P picture by obtaining the difference from the original image which is the immediately preceding I or P picture and encoding the difference information (that is, inter-frame forward predictive encoding). . For example, the original image P1 is the original image I before it.
1, the original image P2 is subtracted from the previous original image P1, and the respective differences are encoded, whereby encoded images P1 and P2 of P pictures are obtained.

The original images B0, B1, B3, ... Are encoded into B pictures using the immediately preceding I or P picture and the immediately following I or P picture. For example, the original image B2 is the original image I1 immediately before that and the original image P1 immediately after that.
And the average image is taken, and the difference information is coded (that is, bidirectional predictive coding) to form a coded image B2 of the B picture.

The coded image has the array shown in FIG. That is, for example, even if the original image I1 is encoded into the encoded image I1 of the I picture, the original images B2 and B in the following order are obtained.
3 is not coded. After that, when the original image P1 is encoded into the encoded image P1 of the P picture, the original images B1 and P3 are decoded in order from the encoded images I1 and P1, and the original images B2 and B3 are B in that order. The pictures are coded into coded pictures B2 and B3. Therefore, as shown in FIG. 3B, the coded images B2 and B3 follow the coded image P1.

Next, the original image P2 is encoded into the encoded image P2 of the P picture, and the original images B4 and B5 are encoded images of the B picture using this encoded image P2 and the preceding encoded image P1. It is encoded into B4 and B5 and arranged after the encoded image P2. In the same manner, the original image is coded. The original images B0 and B1 shown at the beginning of FIG.
Is coded using a preceding P-picture decoded image (not shown) and a subsequent decoded image I1 decoded image, and is arranged after the coded image I1.

FIG. 4 is a diagram showing the details of each layer of MPEG. FIG. 4A shows the sequence layer and FIG. 4B shows the GOP.
The layers and the picture layer are shown in FIG.

In FIG. 4A, the sequence header code 50, horizontal size data 51, etc. form the sequence header SH shown in FIG. 2A, and each GO
It is provided for each P54. Return arrows indicate repetition.
User data 53 can be provided in the sequence header SH as required by the user. When the user data 53 is provided, a user data start code is always added immediately before the user data 53.

In FIG. 4B, the group start code 56, the time code 57 indicating the time, and the closed GO
The P58, the broken link 59, and the like form the GOP header GH shown in FIG. 2B, and are provided for each picture layer (coded image) 64. A group extension code 61 or a user code 63 can be added to the GOP header GH according to the user's need. When the group extension code 61 is added, the extension start code 60 immediately before the group extension code 61 and the user code 63 are added. When adding the code 63,
Immediately before that, the user data start code 62 is added.

In FIG. 4C, the slice layer 69 is a subdivision of the picture layer 64 (FIG. 4B).
The picture layer 64 in FIG. 4B is an aggregate of slice layers 69. A picture layer header including a picture start code 65 and a temporal reference 66 is added immediately before each slice layer. User data 68 can also be added to this picture layer header as required by the user. In that case, the user data start code 67 is always added immediately before that.

The macroblock layer, which is the minimum unit of encoding, has no particular relation to the present invention, and therefore its explanation is omitted.

The other user data start codes 52, 62 and 67 are not used 32 elsewhere.
The hexadecimal number "000001B2" is used in bits.

In encoding an image when recording an m-JPEG moving image, intra-frame correlation is used as in the I picture in MPEG.

As described above, MPEG recording and m-JPEG recording are performed by encoding with MPEG and JPEG. In such MPEG recording, the shutter operation from the input terminal 15 in FIG. When a trigger is input, the microcontroller 9 generates still image instruction information at the shutter trigger input timing during the encoding process, and the user data 63 shown in FIG.
As an addition to the GOP layer. Alternatively, FIG.
The user data 68 shown in (c) may be added as user data 68 to a predetermined slice layer in the GOP layer. In m-JPEG recording, still image instruction information is added to the marker added to each m-JPEG image.

Next, the timing of adding the still image instruction information to the encoded image will be described.

In FIG. 1, the MPEG recording mode and m-JPEG
When the shutter trigger is input from the input terminal 15 during the operation in the recording mode, the microcontroller 9 creates still image instruction information, which is not the original image currently being encoded, but the next original image. Is added as user data to the encoded image of.

This will be described with reference to FIG. 3. Now, the original image B of the input sequential original images (FIG. 3 (a)).
Assuming that the shutter trigger is input at the timing s of 3, the encoded image P1 of the original image P1 arranged next to the shutter trigger is input.
User data 63 or 68 (FIG. 3B) (FIG. 3B)
Is added. “UD” in FIG. 3 indicates that the still image instruction information is added to the encoded image P1 as user data.

In this case, when the original image is encoded, the encoded image P1 is arranged before the encoded image B3 at the timing when the shutter trigger is input, but the original image P1 is encoded. At this time, the shutter trigger has already been input, so it is possible to add still image instruction information to the encoded image P1.

Similarly, when the shutter trigger is input during the encoding process of the original image B2, still image instruction information is added to the encoded image B3, and the shutter trigger is generated during the encoding process of the original images I1 and P1. Is input, the next original image B
2, still picture instruction information is added to B4.

As described above, in the MPEG recording mode, the user wants to reproduce a necessary scene as a still image.
When the shutter is operated in that scene and a shutter trigger is input from the input terminal 15 of FIG. 1, the image immediately after this shutter operation is added as still image instruction information as an image for which still image reproduction is desired. To be done.

The above is the same when operating in the m-JPEG recording mode.

FIG. 5 is a flow chart showing the recording operation of the first embodiment.

In the figure, when the power is turned on, the recording mode becomes operable (step S1), and when the JPEG recording mode is selected ("JPEG" is selected in step S2), J
The procedure moves to the PEG coding process (step S17). In this process,
First, the encoding process waits until the shutter operation is performed (step S18). When the shutter operation is input by the user and the shutter trigger is input from the input terminal 15 (FIG. 1) (step S18), the CCD image sensor 3 captures one image, and a still image from it is JPEG.
JPEG coded by codec 12 (Fig. 1) (step
S19) is recorded in the recording circuit 10 (step S20). If the JPEG recording mode is not released (step S2
1) Return to step S18 to enter the standby state for shutter operation, and turn off the power to end the operation (step S2
2).

When the MPEG recording mode is selected ("MPEG" is selected in step S2), the process waits until a moving image recording start instruction signal is input from the input terminal 16 (FIG. 1) (step S3). When the moving image recording start instruction signal is input (step S3), first, a system stream of the sequence header SH (FIG. 2) from the sequence code 50 of the sequence layer to the user data 53 shown in FIG. Next, the GOP header GH from the GOP layer group start code 56 to the user data 63 shown in FIG.
The system stream of (b)) is created. And MP
The EG codec 11 creates data of the picture layer 64 (that is, an encoded image as an I, P, or B picture) (step S6). Here, if the shutter trigger has not occurred (step S7), the created data is recorded as a file in the recording circuit 10 (step S8), and when the MPEG recording mode is continued (step S7).
9) Then, returning to step S4, the same operation is repeated to sequentially perform image coding processing. In this case, in step S4 before the image coding process (step S6), the GOP header shown in FIG. 4B is created.

In the process of step S4 in such an operation, the user data 63, 68 created is data other than the still image instruction information, and if it is unnecessary, these user data 63, 68 are Not provided.

If a shutter trigger is generated during this operation (step S7), user data is created in 8-bit units based on this shutter trigger as described above (step S5), and described with reference to FIG. When encoding a predetermined image, it is added as user data 63 or 68 to the GOP header of the GOP layer or the header of the picture layer. In this way,
A predetermined image of the moving images is instructed to be reproduced as a still image.

When the user data 63 of the GOP layer is used, for example, in the case of an NTSC type video signal, the shutter trigger is set at 1/30 second intervals. The user data 68 of the picture layer 64 is used to obtain the correlation.

Even when the m-JPEG recording mode is selected ("m-JPEG" is selected in step S2), the moving image recording operation of steps S10 to S16 similar to the MPEG recording mode is performed (in this case, the code JPEG codec 12 (Fig. 1)
Is used as described above), and when the shutter operation is performed (step S13), user data as still image instruction information is created (step S16),
This is added to the marker of the image (m-JPEG image) to be encoded next (step S11).

Marker data processing (step S11)
Is to create marker data as control data indicating that the image is an m-JPEG image.
Although added for each image, when a shutter trigger is input, user data as still image instruction information is further added to this marker.

Next, the reproducing operation of the signal recorded in the recording circuit 10 in FIG. 1 will be described with reference to FIG.

When the power is turned on (step S51), JPEG
When playing a still image (JPEG still image)
(Steps S52 and S60), the micro controller 9 reads the JPEG still image from the recording circuit 10 and the JPEG codec 1
Decrypt in 2 (step S66). In this way, the digital still image video signal expanded to the original data amount is supplied to the external device from the output terminal 14 or processed by the digital signal processing circuit 6, and then the D / A converter 7 Is converted into an analog still image video signal with the output terminal 1
3 to the monitor. This operation continues until there are no more JPEG still images (step S67), and still images are sequentially displayed.

Of course, it is also possible to reproduce one JPEG still image for each user operation.
In addition, a specified JPEG still image is designated and recorded in the recording circuit 1.
It is also possible to perform the still image reproduction by searching and reproducing with 0.

Next, the MPEG recorded in the recording circuit 10
The reproduction operation of the moving image (MPEG moving image) or the m-JPEG moving image (m-JPEG moving image) will be described with reference to FIG.

In this case, for any image,
It is necessary to select whether to reproduce as a moving image or as a still image according to the still image instruction information.

When the power is turned on (step S51) and the moving image reproduction mode of the MPEG moving image is selected by designating a predetermined file (steps S52, S53), the recording circuit 10 outputs MP.
The EG images are continuously read, and decoding processing such as data expansion is sequentially performed by the MPEG codec 11 to obtain a moving image video signal of the original image with the original data amount (step S54), and the video signal is supplied from the output terminal 14 to the external device. Alternatively, the output terminal 13 supplies the monitor to the monitor by the above processing (step S55). Then, until there is an instruction to end playback or until the selected file ends (step S5
6), the operations of steps S54 to S56 are repeated, and moving images are continuously displayed on the monitor.

The above operation is the same when the moving image of the m-JPEG moving image signal is reproduced, and the description thereof is omitted, but the operations of steps S53 to S59 are performed.

Next, a predetermined file is designated and its MPEG
If the image is selected to be reproduced as a still image instructed by the still image instruction information from the moving image (steps S52, S6
0), the MPEG moving image is read at high speed from the specified file of the recording circuit 10 to detect the sequence header SH (step S61), and the user data 63 in the GOP layer (see FIG. 4).
(B)) and user data 68 in the picture layer (see FIG. 4).
The still image instruction information is searched while looking at (c)) (step S62). When the still image instruction information is found, the encoded image to which the information is added is extracted, and the MPEG codec 11 performs decoding processing such as data decompression (step S63),
Supply to a monitor or external device for display (step S6
Four). Then, this operation is repeated until the reading of the file is completed (step S65).

In this case, when the still picture instruction information is added to the I picture, it is decoded by itself and displayed as a still picture, but in the case of the P picture, the I or P picture before it is decoded. , And in the case of a B picture, it is decoded using the I and P pictures arranged before it.

For example, in FIG. 3, assuming that still picture instruction information is added to the coded image P2, this coded image P2 is extracted and decoded. For this decoding, The original image P1 obtained by decoding the decoded image P1 which is the P picture immediately preceding the encoded image P2 is used. In order to decode this encoded image P1, the encoded image I1 which is an I picture is also used. The decoded original image I1 is required.

If still image instruction information is added to the coded image B4, the decoded original images P1 and P2 of the coded images P1 and P2 are used to decode the decoded image B4. However, these encoded images P1
The decoded original image I1 of the encoded image I1 is used to decode the encoded image I1, and the decoded original image P1, I1 of the encoded image P1, I1 is used to decode the encoded image P2.
1 is used.

In order to perform the above decoding, the recording circuit 10
The coded images read out from are sequentially written in the memory circuit 8. However, when the coded images to which the still image instruction information is added are searched, only the coded images necessary for the decoding as described above are retrieved. Is decoded, and the decoded image is used to decode the encoded image to which the still image instruction information is added.

In this way, the unnecessary coded image is not decoded, and the still image instruction information is searched first, so that the still image can be reproduced at high speed.

In MPEG, the image size used is 3
The number of pixels is 60 × 240, which is smaller than the number of commonly used JPEG pixels. Therefore, the playback screen on the personal computer becomes smaller. However, on a personal computer, it is possible to simply enlarge the screen or to enlarge it by interpolation, so this is not a practical problem.

Next, if the image is selected from the m-JPEG moving image of the specified file by the still image instruction information and the image is selected to be reproduced as a still image (steps S52, S53), this designated The m-JPEG moving image is sequentially read out from the file at high speed, and the marker added for each encoded image is searched (step S68). When the marker to which the still image instruction information is added is searched (step S69), the m-JPEG image having the marker is decoded by the JPEG codec 12 (FIG. 1) (step S70) and a predetermined process is performed. Then, it is output from the output terminal 13 or 14 and displayed (step S71). Then, if there are more m-JPEG images in the designated file (step S71), the process returns to step S68, and the same operation for reproducing the next still image is repeated.

In this way, only the m-JPEG image to which the still image instruction information has been added has to be decoded, and therefore still images can be searched at high speed.

As described above, in the first embodiment, even in the moving image recording mode, if there is a desired scene, the still image can be rapidly recorded only by operating the shutter. Therefore, it is not necessary to change the recording mode and miss the imaging of a specific scene. Also, when reproducing a still image, only the coded image necessary for this reproduction is decoded, so that a quick still image can be reproduced.

In the first embodiment, the MPEG moving image or the m-JPEG moving image is continuously read from the designated file, and the encoded image is read every time the still image instruction information is retrieved. May be decoded so that the still images designated by the still image instruction information are automatically displayed in sequence, but if one still image is displayed, the user's instruction operation The reproduction of the next still image may be waited until a certain time. In this embodiment, 1 GO
Although the number of frames in P is 15 and the interval between I or P pictures is 3, it is not limited to this.

In FIG. 1, the digital signal processing circuit 6 also has the processing function of the analog signal processing circuit 4,
The circuit configuration of the signal processing system, such as omitting the analog signal processing circuit 4, is not limited to the circuit configuration shown in FIG.

Further, although the MPEG codec 11 and the JPEG codec 12 are separate from the microcontroller 9, they are not limited to this. By using a high-speed and high-performance microcomputer as the microcontroller 9, for example, JPEG encoding / decoding can be realized by the microcontroller 9.

Further, although the memory circuit 8 is directly connected to the microcomputer 9, a memory may be provided in each of the MPEG codec 11 and the JPEG codec 12 for higher speed signal processing.

FIG. 7 is a flow chart showing the operation of the second embodiment of the video signal recording / reproducing apparatus according to the present invention.
The same processing steps as those in FIG. 6 are designated by the same reference numerals and the description thereof will be omitted.

The difference of the second embodiment from the first embodiment is that time information is used as the still image instruction information.

In FIG. 7, for example, when a shutter trigger is input during the MPEG recording mode (step S7), time information (time code 57 in FIG. 4) is separately stored in a designated area of the memory circuit 8. (Step S81). Then, when a series of recording operations of the moving image is completed, it is recorded in a predetermined area of the recording circuit 10 as still image instruction information in the moving image (step S83).

FIG. 8 shows the recording circuit 1 according to the second embodiment.
8 is a conceptual diagram showing a data recording area of 0, where 80 is the entire recording area of the recording circuit 10, 81 is a moving image recording area for recording moving images with priority, and 82 and 84 are freely usable areas, 8
Reference numeral 3 is a still image recording area for recording still images with priority, 84 is an area for recording still image information in a moving image file, and 85
Is a recording area of still image instruction information which is time information.

The area 85 for recording the still image information may actually be a very small area, and the area ratio in FIG. 8 does not necessarily indicate the actual area ratio of the recording area.

When reproducing a still picture from the image information recorded in the recording circuit 10, the time information corresponding to the desired still picture is searched from the recording area 85, and the searched time information is added. The moving image recording area 8
Try to find it from 1.

In the second embodiment, a predetermined file in the moving image recording area of the recording circuit 10 is read out at high speed,
A coded image to be displayed as a still image is searched by comparing the time code added thereto with the searched time information. Therefore, high-speed still image reproduction is possible.

In the recording area 84 of the recording circuit 10, a coded image to be reproduced as a still image and a coded image required for decoding the same are recorded as a set, and when the still image of the desired image is reproduced, It is also possible to read out the corresponding one of the sets of coded images recorded in the recording area from the time information searched in the recording area and reproduce the still image with this. As a result, it is not necessary to search the video file itself, and the search can be performed at high speed.

Further, in the second embodiment, the time information as the still image instruction information generated during the recording of the moving image is collectively recorded in the recording circuit 10 after the recording of the compressed moving image is completed. It is also possible to create a predetermined file in the recording circuit 10 during recording and record it there as needed.

FIG. 9 is a block diagram showing a third embodiment of a video signal recording / reproducing apparatus according to the present invention, in which 101 is a video signal recording / reproducing apparatus, 102 is a switch, 103 is an external video signal input terminal, and 104 is an external video signal input terminal. Is a microcontroller, 105 is an input terminal for an external audio signal, 106 is a microphone, 107 is a microphone preamplifier, 10
8 is a switch, 109 is an A / D converter, 110 is MPEG
An audio codec, 111 is a recording circuit, and 112 is a removable recording medium.

In this figure, this third embodiment is shown in FIG.
The difference from the embodiment shown in FIG.
The audio signal is collected by the A / D converter 109 and converted into a digital audio signal by the MPEG audio codec.
It is encoded as an audio signal and is recorded together with the above video signal, and an external input terminal 103 for the video signal.
That is, the external input terminal 105 for the audio signal is provided, and the removable recording medium 112 can be used in the recording circuit 111.

Here, the switches 102 and 108 are interlocked, and the image information from the lens 2 and the microphone 10 are connected.
In the internal recording mode in which the voice information collected in 6 is coded and recorded, both are connected to the terminals on the side illustrated. The removable recording medium 112 is, for example, a PC card type memory card, a hard disk, or a magneto-optical disk card.

According to the third embodiment, in addition to the embodiment shown in FIG. 1, an audio signal can be encoded and recorded together with a video signal, and the external input terminal 10
By providing 3, 105, it is possible to specify a specific frame as a still image while recording a moving image for a video signal from another video device.

FIG. 10 is a block diagram showing a specific example of a switch circuit for generating a shutter trigger and a moving image recording start signal in each of the above embodiments, in which 120 is a spring, 121, 1
22 is an electrode, 123 is a power supply, 124 is a spring, 125, 1
26 is an electrode, 127 is a power supply, 128 is a switch contact piece, 1
Reference numeral 29 is a knob, and 130 is a housing of the video signal imaging device, and the same reference numerals are given to the portions corresponding to the above drawings.

In the figure, this specific example is one in which a shutter trigger and a moving image recording start signal can be generated by one switch circuit, which can be touched by the user for operation. Is only a knob 129 that can be moved in the horizontal and vertical directions, and other members shown in the drawing are provided in the housing 130.

When the user pushes the knob 129 in the horizontal direction, the switch contact 128 causes conduction between the electrodes 125 and 126, and a logic signal "H" is generated at the input terminal 16. When the user releases the knob 129, the knob 129 and the switch contact piece 128 return to their original state due to the restoring force of the spring 124, the electrodes 125 and 126 are insulated, and the input terminal 16 becomes the logic signal “L”. . The logic signal "H" is the previous moving picture recording start signal, and the logic signal "L" is the moving picture recording stop signal. Therefore, knob 12
By operating 9 in the horizontal direction, it is possible to record and stop the moving image.

When the user pushes the knob 129 in the vertical direction, the switch contact piece 128 makes the electrodes 121 and 122 electrically conductive, and the logic signal "H" is generated to connect the input terminal 15 to the power supply 123. When the user releases the knob 129, the restoring force of the spring 120 causes the knob 129 and the switch contact piece 128 to return to their original states, and the electrodes 121, 12
The two are insulated, and the input terminal 15 has a logic signal "L".
Becomes This logic signal "H" is the previous shutter trigger.

In this specific example, the switch contact piece 12
Start moving picture recording by moving 8 in the horizontal direction.
Although the shutter trigger is generated by generating the stop signal and moving it in the vertical direction, the moving direction of the switch contact piece 128 may be exchanged with this, or the combination of the moving directions may be changed. It can be decided arbitrarily.

As described above, in this specific example, since the moving picture recording start / stop signal and the shutter trigger can be generated by one switch circuit, the entire apparatus can be downsized.

[0092]

As described above, according to the present invention,
Not only can you record still images and movies, but
Even during moving image recording, it is possible to record an arbitrary scene in the same manner as normal still image recording and reproduce it as a still image.
Therefore, it is possible to save a specific scene that occurred during moving image recording as a still image without missing a photo opportunity.

Further, according to the present invention, still image recording and reproduction can be similarly performed on a moving image signal generated and input by an external device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a video signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a conceptual diagram showing a hierarchical relationship of MPEG coded video signals.

FIG. 3 is an explanatory diagram of MPEG encoding processing.

FIG. 4 is a diagram showing a data structure of each layer of an MPEG encoded video signal.

FIG. 5 is a flowchart of the recording operation of the first embodiment shown in FIG.

FIG. 6 is a flowchart of a reproduction operation of the first embodiment shown in FIG.

FIG. 7 is a flowchart showing the recording operation of the second embodiment of the video signal recording / reproducing apparatus according to the present invention.

FIG. 8 is a schematic diagram showing a region configuration of a recording circuit in the second embodiment shown in FIG.

FIG. 9 is a block diagram showing a third embodiment of a video signal recording / reproducing apparatus according to the present invention.

10 is a configuration diagram showing a specific example of a shutter trigger and a moving image recording start / stop signal generating means in FIGS. 1 and 9. FIG.

[Explanation of symbols]

 1 CCD image sensor 9 Micro controller 10 Recording circuit 11 MPEG encoding / decoding circuit 12 JPEG encoding / decoding circuit 15 Shutter trigger input terminal 16 Video recording start / stop instruction signal input terminal 57 Time code 62 User data start code 63 User data 68 User data 102 Switch 103 External video signal input terminal 104 Micro controller 105 External audio signal input terminal 106 Microphone 108 Switch 110 MPEG audio codec 111 Recording circuit 112 Removable recording medium

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Yamamoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Multimedia system development headquarters (72) Inventor Hiroaki Kami Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa 292, Machi Incorporated company Hitachi Image Information System

Claims (14)

[Claims] 1. A video signal recording / reproducing apparatus for compressing and recording a moving image and a still image, means for instructing compression and recording start of the moving image, means for generating a shutter trigger for still image recording, and recording of the moving image. Information about the shutter trigger that occurred in
A video signal recording / reproducing apparatus comprising: a means for writing the compressed moving picture control data. 2. The video signal recording / reproducing apparatus according to claim 1, further comprising: an image pickup unit including a lens and an image pickup element. 3. The video signal recording / reproducing apparatus according to claim 2, further comprising a microphone, an external video signal input circuit, and an external audio signal input circuit. 4. The video signal recording / reproducing apparatus according to claim 1, 2 or 3, wherein the shutter trigger information uses a control data area for each moving image frame. apparatus. 5. The video signal recording / reproducing apparatus according to claim 1, 2, or 3, wherein the shutter trigger information uses a control data area for each video signal block obtained by dividing the moving image frame. Video signal recording / reproducing device. 6. A video signal recording / reproducing apparatus for compressing and recording a moving image and a still image, means for instructing compression and recording start of the moving image, means for generating a shutter trigger for still image recording, and Means for recording the time of the shutter trigger that occurred during recording of a moving image by using the time information used in the moving image data. 7. The video signal recording / reproducing apparatus according to claim 6, further comprising: an image pickup means including a lens and an image pickup element. 8. The video signal recording / reproducing apparatus according to claim 7, further comprising a microphone, an external video signal input circuit, and an external audio signal input circuit. 9. A video signal recording / reproducing apparatus for compressing and recording / reproducing a video signal, a moving picture / video signal reproducing circuit for expanding and reproducing a compressed moving picture / video signal, and control associated with the compressed video signal. Play the signal,
A control circuit for controlling the moving image / video signal reproducing circuit; a detection circuit for detecting a first frame designation signal included in the control signal for designating a specific frame of the reproduced moving image / video signal; And a reproducing circuit for reproducing a designated frame of the moving image signal on the basis of the output of the video signal recording / reproducing device. 10. The video signal recording / reproducing apparatus according to claim 9, wherein only the frame designated by the frame designating signal is output as a still image video signal. 11. The video signal recording / reproducing apparatus according to claim 9, wherein only a frame designated by the frame designation signal is output as a still image video signal at predetermined time intervals. Playback device. 12. A video signal recording / reproducing apparatus for compressing and recording / reproducing a video signal, and a moving picture / video signal reproducing circuit for reproducing and expanding the compressed moving picture / video signal, and an accompanying circuit to the compressed video signal. Play the control signal,
A control circuit that controls the moving image video signal reproduction circuit, and reproduces a second frame designation signal that is recorded separately from the compressed moving image video signal and that designates a specific frame of the compressed moving image video signal. A video signal recording / reproducing apparatus comprising: a frame designation signal reproduction circuit; and a circuit for reproducing a predetermined frame of the moving picture video signal based on an output of the frame designation signal reproduction circuit. 13. The video signal recording / reproducing device according to claim 12, wherein the circuit for reproducing the frame reproduces video frames at predetermined intervals. 14. The video signal recording / reproducing apparatus according to claim 1 or 6, wherein a switch contact piece of one switch circuit is moved in different directions, and a signal for instructing compression and recording start of the moving image and the stationary state are set. A video signal recording / reproducing apparatus characterized by generating an image shutter trigger.