JPH06165103A - Image data transmitting equipment - Google Patents

Abstract

PURPOSE:To improve the operation convenience of an image data transmitting equipment by efficiently transmitting an image signal even when the image signal as a still image is matched with any of a frame still image and a field still image. CONSTITUTION:When the movement of an image signal S1 is detected, still image information SC expressing which is optimum as a still image, a frame still image or a field still image, is multiplexed with coded image data D20 and the multiplexed data are transmitted, the decoding side can generate an optimum image signal S22 from decoded image data D25 as a still image based upon still image information C10.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIGS. 4 to 6) Problem to be Solved by the Invention (FIGS. 4 to 6) Means for Solving the Problem (FIG. 1) Action (FIG. 1) Example (FIG. 1) ~ Fig. 4) Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data transmission device, and can be applied to, for example, an image data recording / reproducing device which digitizes an image signal and records it on a predetermined recording medium for reproduction.

[0003]

2. Description of the Related Art Conventionally, as an image data recording / reproducing apparatus,
There is a recording medium such as an optical disk which records and reproduces digitally encoded image data and audio data. That is, the image data recording / reproducing apparatus 1 shown in FIG. 5 includes an image data recording apparatus 3 for digitally encoding an image signal and an audio signal and recording the optical signal on the optical disk 2, and an image for reproducing the image data recorded on the optical disk 2. The data reproducing device 4 is included.

In the case of this image data recording device 2, the image signal S1 inputted as an analog signal is digitized by the analog-digital conversion circuit (A / D) 5, and the image data D1 obtained as a result is encoded circuit (ENCODE). ) 6 and then coded data D2 as a multiplexing circuit (M
PX) 7 is input.

The multiplexing circuit 7 multiplexes the coded data D2 and additional information accompanying the coding, and the resulting transmission data D3 is followed by an error correction code adding circuit (ECC) 8
And the error correction code is added. The transmission data D4 obtained as a result is modulated by a modulation circuit (MOD) 9 by a predetermined modulation method, and recorded as a recording signal S1 on the optical disk 2 through the optical pickup 10.

On the other hand, in the image data reproducing apparatus 4, the reproduction signal S2 reproduced from the optical disk 2 through the pickup 10 is inputted to the waveform equalizing circuit (EQ) 11 and the signal is reproduced.
Demodulation circuit (DEMOD) that is digitized and waveform equalized
After being input to 12, and demodulated according to a predetermined modulation method, an error correction circuit (ECC) 1 as reproduced data D10.
Input to 3.

The error correction circuit 13 reproduces the reproduced data D10.
Is error-corrected based on the error correction code added at the time of recording, and the reproduction data D11 obtained as a result is separated by the demultiplexing circuit (DEMPX) 14 into reproduction coded data D12 and reproduction additional information. Encoded data D
12 is decoded by the decoding circuit (DECODE) 15,
The image data D13 is stored in the frame memory 16.

The frame memory 16 is controlled by the control circuit 17, and the image data D1 according to the reproduction mode.
4 is read out and the digital-analog conversion circuit (D /
A) Reproduced image signal S sent to 18 and made of analog signal
It is converted into 13 and input to the monitor device 19 for display.

When the reproduction mode is normal reproduction, the image data D13 is sent from the frame memory 16 to the digital-analog conversion circuit 19 in the order encoded by the encoding circuit 6. Further, when the reproduction mode is a still image, the image data D14 of the same image frame or field is repeatedly sent to the digital-analog conversion circuit 18. If the playback mode is frame advance, frame or field image data D1 is read from the frame memory 16 every few frames.
4 is sent to the digital-analog conversion circuit 18.

[0010]

By the way, when the image signal which is the source of encoding and decoding is the interlace system, there are two methods of displaying a still image, one of which is as shown in FIG. 4 (A). Even field even in frame still image
0, Even1, ... And odd field ODD0, O
This is a method of displaying both DD1 ...

On the other hand, the other is a field still image, which is a method of displaying only one of an odd field and an even field. For example, as shown in FIG. 4B, if even fields Even0, Even1, ... Are selected, odd fields ODD0, ODD are selected.
The parts 1, ... Are replaced by the adjacent even fields Even0, Even1, .. Alternatively, the odd field ODD0, ODD1, ... Part evenly adjacent to the even field Even0, Even
It may be replaced with the average value of 1, ...

In a frame in which the image does not actually move, the frame still image has a better image quality, but in a frame in which there is a motion, the frame still image has a time difference between both fields. In general, field still images are generally easier to see. Assuming image data as shown in FIG. 6 (FIG. 6 (A)) as an image that actually moves, a frame still image (FIG.
It can be seen that the field still image (FIG. 6C) is easier to see than the field (B)).

However, in the image data recording / reproducing apparatus 1 described above, the still image of the moving image is fixed to either the frame still image or the field still image, and each one is not necessarily one.
There is a problem that a still image suitable for one frame cannot be obtained, and the still image of a moving image is still insufficient in terms of image quality.

In order to solve such a problem, a still image is judged at the time of recording as a frame still image or a field still image and recorded in any one of the still image modes, and reproduced at the time of reproduction on the basis of a discrimination flag. (Japanese Patent Application No. 2-230880), or when transmitting a still image, a frame still image or a field still image is judged, and in the case of a field still image, only one field is transmitted (special feature). Japanese Patent Application No. 3-179889) has been proposed.

In either case, however, the image to be recorded or transmitted is defined according to the judgment result on the recording side or the transmission side. Therefore, an image data recording / reproducing apparatus using a recording medium such as an optical disk. In No. 1, it was not possible to arbitrarily reproduce a still image or a moving image regardless of recording, and it was still insufficient in terms of usability.

The present invention has been made in consideration of the above points. Image data that can be efficiently transmitted and improved in usability regardless of whether the image signal is suitable as a frame still image or a field still image as a still image. It is intended to propose a transmission device.

[0017]

In order to solve such a problem, in the present invention, the encoding means 5 and 22 for digitally encoding the input image signal S1 and transmitting the encoded image data D20, and the image signal S1. On the basis of the still image, a still image determining means 24 for sending out still image information SC indicating which of a frame still image and a field still image is optimum as a still image.
And a multiplexing means 25 for multiplexing the encoded image data D20 and the still image information SC and transmitting the multiplexed data as transmission data D21.
I decided to set and.

Further, in the present invention, the demultiplexing means 26 for separating the coded image data D25 and the still image information SC10 from the transmission data D24 which is transmitted after the coded image data D20 and the still image information SC are multiplexed and transmitted. Decoding means 15 for decoding the coded image data D25 obtained by the demultiplexing means 26, and decoding by the decoding means 15 based on the still image information SC10 obtained by the demultiplexing means 26. Image signal generating means 16, 17, 18 for generating an image signal from the decoded image data D25 is provided.

Further, in the present invention, the multiplexing means 25
The transmission data D21 sent from the recording data S20
Is recorded on a predetermined recording medium 2. Further, in the present invention, the still image determination means 24 detects the motion MV of the image signal S1, and the still image information S indicating whether the frame still image or the field still image is optimum as the still image.
C is sent out. Furthermore, in the present invention, the predetermined recording medium 2 on which the transmission data D21 is recorded is reproduced, and the reproduction data obtained as a result of the reproduction is supplied to the demultiplexing means 26 as the transmission data D24.

[0020]

The motion of the image signal S1 is detected, and still image information SC indicating which of a frame still image and a field still image is optimum as a still image is multiplexed with the encoded image data D20 and transmitted. As a result, the decoding side can generate an optimum image signal as a still image from the decoded image data D25 based on the still image information SC10.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1 in which parts corresponding to those in FIG. 5 are designated by the same reference numerals, 20 indicates the image data recording / reproducing apparatus of the present invention as a whole, and similarly to FIG. In addition, it is composed of an image data recording device 21 for recording on the optical disc 2 and an image data reproducing device 22 for reproducing the image data recorded on the optical disc 2.

In the case of this image data recording device 21, the image signal S1 input as an analog signal is digitized by the analog-digital conversion circuit (A / D) 5, and the image data D1 obtained as a result is encoded circuit (ENCODE). ) 23
Is encoded with. In the case of this embodiment, the encoding circuit 23 divides one frame of the image data D1 into a plurality of blocks and obtains the motion vector of each block by the so-called block matching method.

Actually, as shown in FIG. 2, assuming that the immediately preceding image is the reference image (FIG. 2A) and the current image is the attention image (FIG. 2B), the motion vector is obtained by the block matching. Then, a motion vector as shown in FIG. 2C can be obtained for each block of the image of interest. Note that the reference image is 1 with respect to the image of interest.
Frame This is the past adjacent frame.

In the case of the encoding circuit 23, the maximum value MV of the motion vector thus obtained is input to the still image mode determination circuit 24 for each frame. In the case of this embodiment, the still image mode determination circuit 24 is constructed as shown in FIG.

That is, the maximum value MV of the motion vector input from the encoding circuit 23 is compared with a preset value in the motion determination circuit 30, and the maximum value MV of the motion vector is obtained.
If is smaller than the set value, it is determined that the movement is small,
A control signal C1 for selecting the first input end a of the second switch 32 through the first input end a of the first switch 31.
Is sent.

At the first and second input ends a and b of the second switch 32, codes for designating frame still images generated by the frame still image code generating circuit 33 and the field still image code generating circuit 34, respectively. A code FI designating FR and a field still image is input.
Therefore, when the first input terminal a of the second switch 32 is selected, the code FR designating the frame still image is sent to the multiplexing circuit 25 as the still image information SC.

The motion judging circuit 30 judges that the motion is large when the maximum value MV of the motion vector is equal to or more than the set value,
The control signal C1 for selecting the second input terminal b of the second switch 32 is transmitted. As a result, the second input terminal b of the second switch 32 is selected, and the code FI designating the field still image is sent to the multiplexing circuit 25 as still image information SC.

In the case of this embodiment, the still picture mode can be manually selected. At this time, the first switch 31 is connected to the second input terminal b and controlled by the external manual control signal MN. It By doing so, it is possible not only to automatically select the field still image and the frame still image from the motion vector, but also to arbitrarily specify each frame.

The still image information SC representing the frame still image or the field still image thus obtained is input to the multiplexing circuit 25, and the encoded data D20 input from the encoding circuit 22 and the addition accompanying the encoding. It is multiplexed with the information. The transmission data D21 obtained as a result is added with an error correction code by the subsequent error correction code addition circuit 8, modulated by a predetermined modulation method in the modulation circuit 9, and recorded as the recording signal S2.
0 is supplied to the optical pickup 10 and the optical disk 10
Recorded above.

On the other hand, in the image data reproducing device 22,
A reproduction signal S21 reproduced from the optical disk 2 through the optical pickup 10 is input to the waveform equalizing circuit 11, binarized and waveform equalized, and input to the demodulating circuit 12.
After being demodulated according to a predetermined modulation method, reproduced data D2
3 is input to the error correction circuit 13.

In the error correction circuit 13, the reproduced data D23
Error correction is performed based on the error correction code added at the time of recording, and the resulting reproduction data D24 is separated by the demultiplexing circuit 26 into reproduction coded data D25 and reproduction additional information including reproduction still image information SC10. The reproduced coded data D25 is decoded by the decoding circuit 15 and stored in the frame memory 16 as image data D26.

The reproduced still image information SC10 is stored in the control circuit 2
Input to 7. This control circuit 27 is a frame memory 1
6 to control the image data D27 read from the frame memory 16 according to the reproduction mode.
Is sent to the digital-analog conversion circuit 18 and converted into a reproduced image signal S22 which is an analog signal, and the monitor device 1
9 is input and displayed.

When the reproduction mode is normal reproduction, the image data reproducing device 22 reads the image data D27 from the frame memory 16 in the order of encoding by the image data recording device 21. When the reproduction mode is still image, the control circuit 27 controls the reading of the frame memory 16 according to the reproduced still image information SC10 input from the demultiplexing circuit 26.

That is, when the reproduction mode is a still image and the reproduced still image information SC10 is a frame still image, the control circuit 27 repeatedly reads the frame of the same image from the frame memory 16 and uses this as the image data D27 as a digital-analog conversion circuit. Send to 18. Further, when the reproduced still image information SC10 is a field still image, for example, as shown in FIG. 5, the same image in which the odd field Odd0, Odd1 ,. It is repeatedly read from the frame memory 16 and is sent to the digital-analog conversion circuit 18 as image data D27.

Further, in the control circuit 27, when the reproduction mode is frame-by-frame reproduction and the reproduced still image information SC10 is a frame still image, the image data D27 is read from the frame memory 16 every few frames, and this is read out by the digital-analog conversion circuit. Even when the reproduced still image information SC10 is a field still image, the image data D27 is read out every few frames and is sent to the digital-analog conversion circuit 18. Play.

According to the above construction, when the image signal S1 is digitally encoded and recorded on the optical disc 2, a still image, which is either a frame still image or a field still image, is selected for each frame according to the movement of the image. When the still image information indicating the mode is recorded together with the encoded image data, and the optical disc 2 is reproduced and decoded, the reproduction mode of the normal reproduction or the frame advance always displays the image with good image quality and the frame advance reproduction display. Images can be obtained.

Further, according to the above configuration, even when a still image is designated as the reproduction mode, the image quality is automatically changed to the still image mode selected at the time of recording according to the still image information. It is possible to obtain an image data recording / reproducing device 20 which can obtain a good still image display image and which can remarkably improve the usability.

In the above embodiment, the still picture mode is determined for each frame based on the maximum value of the motion vector for one frame.
Even if the still image mode is determined based on the average value of the motion vectors for the frames, the same effect as the above-described embodiment can be obtained. Furthermore, the determination of the still image mode is
The determination may be made not only by the motion vector but also by the difference for one frame or one field.

In the above embodiment, the image data transmission device according to the present invention is applied to the image data recording device and the image data reproducing device for recording and reproducing the image data on the optical disk, but the recording medium is not limited to this. The present invention can also be applied to those using other recording media such as magnetic tapes, magnetic disks, and magneto-optical disks.

Further, in the above embodiment, the case where the image data is recorded on the recording medium and reproduced is described.
The invention is not limited to the recording medium, and is widely applicable and suitable for the case of transmitting image data using a wired or wireless transmission path.

[0042]

As described above, according to the present invention, the motion of an image is detected, and still image information indicating which of a frame still image and a field still image is optimum as a still image is multiplexed with encoded image data. As a result, the decoding side can generate the optimum image signal as a still image from the decoded image data based on the still image information on the decoding side, and thus the image signal can be a frame still image or a field still image as a still image. It is possible to realize an image data transmission device that can be efficiently transmitted to any of the images and can be significantly improved in usability.

[Brief description of drawings]

FIG. 1 is a block diagram showing an image data recording / reproducing apparatus as an image data transmitting apparatus according to the present invention.

FIG. 2 is a schematic diagram for explaining a method of detecting a motion vector in the image data recording / reproducing apparatus of FIG.

FIG. 3 is a block diagram showing a still image mode determination circuit in the image data recording / reproducing apparatus of FIG.

FIG. 4 is a schematic diagram for explaining a method of displaying a still image by an interlace method.

FIG. 5 is a block diagram showing a conventional image data recording / reproducing apparatus.

FIG. 6 is a schematic diagram showing a frame still image and a field still image in comparison.

[Explanation of symbols]

1, 20 ... Image data recording / reproducing device, 2 ... Optical disk, 3, 21 ... Image data recording device, 4, 22 ... Image data reproducing device, 5 ... Analog-digital conversion circuit,
6, 22 ... Encoding circuit, 7, 25 ... Multiplexing circuit, 8
... error correction code addition circuit, 9 ... modulation circuit, 10 ...
Optical pickup, 11 ... Waveform equalization circuit, 12 ... Demodulation circuit, 13 ... Error correction circuit, 14, 26 ... Demultiplexing circuit, 15 ... Decoding circuit, 16 ... Frame memory,
17, 27 ... Control circuit, 18 ... Digital-analog conversion circuit, 19 ... Monitor device.

Claims (5)

[Claims] 1. An encoding unit for digitally encoding an input image signal and transmitting encoded image data, and which of a frame still image and a field still image is optimum as a still image is selected based on the image signal. An image data transmission apparatus comprising: a still image determination means for transmitting the represented still image information; and a multiplexing means for multiplexing the encoded image data and the still image information and transmitting the multiplexed data as transmission data. 2. Demultiplexing means for separating the coded image data and the still image information from transmission data in which the coded image data and the still image information are multiplexed and transmitted, and the demultiplexing means. Decoding means for decoding the encoded image data, and an image signal from the decoded image data decoded by the decoding means on the basis of the still image information obtained by the demultiplexing means. An image data transmission device comprising: an image signal generating means for generating the image data. 3. The image data transmission device according to claim 1, wherein the transmission data sent from the multiplexing means is recorded as recording data on a predetermined recording medium. 4. The still image determination means detects the motion of the image signal and sends out the still image information indicating which of the frame still image and the field still image is optimal as the still image. The image data transmission device according to claim 1, wherein 5. A predetermined recording medium having the transmission data recorded thereon is reproduced, and reproduction data obtained as a result of the reproduction is supplied to the demultiplexing means as the transmission data. Item 2. The image data transmission device according to item 2.