The method of recording images to a digital video tape recorder

 

(57) Abstract:

The invention relates to the accumulation of information. The inventive method for recording images to a digital video tape recorder units of groups of pictures (DOR), consisting of an arbitrary combination of the I picture encoded using only information of the corresponding image, In the image encoded by using the compensating movement prediction from past and/or future reference picture, and P picture encoded using a compensating movement prediction from the past reference image. The peculiarity of the method is that the low-frequency data of each synchronization unit I-image recording at a certain distance on each track I-picture, B-picture and P-picture, high-frequency data for each synchronization unit I-images are sequentially recorded in the unrecorded area of the tracks for the I-picture data of the P-image is sequentially written in the area that remains after the recording of low-frequency data of I-picture on the tracks for the P-image and the data In the images sequentially recorded in the area, which is s constant speed output for recording on the recording medium and reduce the loss of information in special modes improves the quality of a reproduced image with retaining the advantages of high compaction method internetowego coding. 2 S. and 6 C.p. f-crystals, 5 Il.

The invention relates to a digital video tape recorder (CWCR) and, more to the method of recording images to a digital video tape recorder, capable of maintaining a constant speed of data output a certain amount of data, performing special playback image and improve the quality of the reproduced image in these modes, using high compressibility (seal), which is an advantage when interframe encoding method.

Due to the progressive development of digital video technology in the eighties of this century, the technology of digital compressor - seal - has been used in various electronic applications in the fields of communication, such as videoconferencing, digital Moderne broadcasting and video phones. In particular compression method frequency band signal for CWCR, which was developed last few years, mainly uses the method of intraframe coding, which is not taken into account the redundancy of information in adjacent frames. However, since the seal data using intraframe coding method eliminates redundancy in PCAs attempts to use the method of interframe coding as a method of sealing the moving video for the destruction of time redundancy, in summarization of data for CVCR. Since the method of interframe coding can destroy interframe redundancy, its level of compaction of the signal is higher than with the method of intraframe coding.

For example, if the signal from the NTSC standard are sampling the signal in the ratio 4: 2: 2, receive information frequency of about 158 megabits per second. To record such data on the tape information should shrink to about 25 megabits per second. Accordingly, the data of the experiments when comparing similar quantities of compressed data the results of the compression interframe coding give much better results than the method of intraframe coding. Thus, it is possible to conclude that for data compression for CVCR method should be used interframe encoding.

However, although the method of interframe coding has the advantage that it has not been used in CVCR due to the specific characteristics of the tape, i.e., the recording media. In other words, if the data recorded on such recording media as magnetic tape, even though we should have a constant or fixed speed data transmission, this constant speed is difficult to obtain.

The encoder g is about encoding, which was proposed to solve the constant speed of the data.

Fig. 1 is a block diagram of one example of encoder MPEG for video signals (see ISO/IEC/JTC1/SC29/WG11, presents 26 March 1992 conference of the international organization for standardization expert group movie MPEG: "Coding of moving pictures and Associated Audio" - "Coding of moving pictures and associated audio").

A brief explanation of the work videocoding device moving pictures MPEG is as follows.

In the encoding device shown in Fig. 1, the recorder frame 10 receives the input video signal and converts color coordinates, subfibers signal and the division into blocks.

The motion estimator 12 estimates the similar parts of the previous and subsequent images to represent thus the result of the move on position as vector data, and the data output vector data and the data of mode I, and R. the data of mode I, and P represent classes of images. I-picture is vnutrikarernym image, which is obtained by removing only the spatial redundancy. P-picture or p is TEI. Thus, P-picture, we can say that resolves a similar part between the I-picture and P-picture. On the other hand, the P-picture as the extension data is a motion vector obtained at the time of prediction. B-the image is located between the I-picture and P-picture. Through bidirectional prediction from the I-images and P-images receive a B-picture by encoding prediction errors.

The amount of data of I-picture is less data than P-pictures, in which data is smaller than in the B-image. As the amount of data in each image (I, P and b are unequal, a buffer 32, to maintain a constant data rate in the transmission path, to so adjust the amount of data. As described above, the motion estimator 12 generates data of mode I, B and P, and accordingly the data mode provides both the data signal and the data of the motion vector.

The first adder 14 adds the output signal from the personnel of the guardian/the predictor 28 with the output video signal from the motion estimator 12.

Discrete cosine Converter (DT) 16 produces energy uplotneniyai in General, the distributed video signal and produces a dense distribution of such processed video signal in a certain area.

Quantization 18 Q quantserve energy-multiplexed video signal from the output of the circuit DCT 16 at a predetermined quantization levels (levels Q or steps) and performs encoding on the fly-length quantisierung video.

The variable length coding (VLC) is performed in the circuit 20, which seals quantitively and encoded by the run-length signal generated by quantization 18. That is, among the signals having 256 levels represented by eight bits, the high-frequency data presents a smaller number of bits, and the data is less frequently represented by a large number of bits. Accordingly decreases the total number of bits representing the signal. On the other hand, dequantization Q-122 takes quantityrange the video signals from the output of quantitate 18 and restores the received signal to the signal before quantization.

The scheme of the inverse DCT (DCT-1) 24 receives the output of dequantizer 22 and restores the received signal to the signal before him was processed discrete cosine transform.

The second adder 26 adds the output of the circuit DCT-124 with the release of personnel of the guardian/the predictor 28.

Personnel hranitel the but was thrown from the second adder 26 respectively to the data of the motion vector and the output mode from the motion estimator 12.

The multiplexer 30 is selectively produces an output video signal, condensed and generated by the VLC scheme 20, the data of the motion vector and mode data I, B and P generated by the motion estimator 12.

The buffer 32 temporarily stores data, because the length of the data multiplexer 30 is uneven, to then issue the stored data at a constant speed. Here, the buffer 32 determines the level of quantization, respectively, completeness of data, and controls quantization 18 through the controller 34 based on the level of quantization. If the completeness of the data in the buffer 32 is high, the level of quantization is increased to reduce the amount of data. Meanwhile, if the completeness of the data is low, the level of quantization is reduced to increase the amount of data.

As described above, the video signal, the number of output data which is continuously adjusted, in the end, is recorded on the recording medium (tape). To record on the tape one frame of video data is divided and recorded on four tracks, according to specific characteristics CWCR. However, since the video signal is divided and recorded on multiple tracks by the above conventional method, when the operations of the special modes such as search with high speed, Ostorozhno search in this digital WRC, was offered a separate method of recording one frame of the video signal on the expected path of the recording head when in special modes. However, since the method must accurately estimate the position of this track and just keep track of it during this work, met various technical difficulties and there are problems when using. Also, because the constancy of the speed data is not fully achieved, the number of interframe data varies.

On the other hand, since the compacted and encoded data is different from the analog signal, the amount of data in a predetermined area of the image does not match a given value of the original image. Therefore, when a special mode, the playback quality of the original image may not be higher than the analog signal. As may remain unrestored area when restoring compacted digital data in special modes, you need to add the correct signal in this area in order to prevent deterioration of image quality.

Therefore, the purpose of this invention is to provide a method for recording images in a digital video tape recorder to be able to improve the quality of vosproizvedeny and reduce the loss of information in special modes, using at the same time, the advantages of high data density when interframe encoding method.

Another aim of the invention is to provide a method for recording images in a digital video tape recorder by adding specific image data on the tape to avoid empty seats on the image through effective filling of the image, sealed digital data when in special modes.

To achieve the above objective, a method of recording images to a digital video tape recorder units of groups of pictures (GOP) consisting of an arbitrary combination of the I picture encoded using only information of the corresponding image, B image encoded using compensatory movement prediction from past and/or future reference pictures and P-pictures encoded using compensatory movement prediction from the past reference image, wherein the low-frequency data of each synchronization unit I-image recording at a certain distance on each track for I-pictures, B-pictures and P-depicts the ing a blank area of the paths for the I-picture, data P-images are sequentially recorded in the area that remains after the recording of low-frequency data of I-picture on the tracks for the P-image and the data of the B-image is sequentially written in the area that remains after the recording of low-frequency data of I-picture on the tracks for the B-image.

Further, to achieve the other objectives of the invention a method of recording images to a digital video tape recorder in which the multiplexed digital video signal of each Polysorbate frame is divided into a predetermined number of podsobranny, divided into low-frequency data and high frequency data, so that the low-frequency data recorded on the tracks at a certain distance the length of the tape, and high-frequency data is sequentially recorded on the rest of the area tracks, characterized in that a predetermined number of podsobranny divided into many groups, respectively, a predetermined method, and then the low-frequency data of all podsobranny that belong to the same group, write together in the area for recording the low-frequency data of each Polysorbate belonging to the same group.

The above objectives and other the NTA embodiment with reference to the accompanying drawings, where:

Fig. 1 is a block diagram of a conventional encoding device for moving images;

Fig. 2 is an example of a recording format on the tape in which data is recorded by the recording method of the image in CVCR according to this invention;

Fig. 3 is another recording format on the tape according to this invention;

Fig. 4A-C is an image composed of multiple podsobranny; and

Fig. 5 - the type of the synchronization unit to perform operations of the special modes, according to this invention.

The present invention will be described below with reference to accompanying drawings Fig. 1 to 3. In Fig. 2, one frame of digital video data is recorded on four tracks on the recording medium 100. As for images, obtained by the method of seals moving images, one set consists of I-pictures are coded using only information of the corresponding image, B image is encoded using a compensating movement prediction in both directions, i.e. from the past and/or future reference picture, and P picture encoded using a compensating movement prediction from the past reference image, i.e. the I-picture. The other is on the first option.

When copied images consist of I-pictures, B-pictures and P-pictures, although there may be many sets in the order of the images to be written on the tracks of the recording medium 100, will be explained the set, recorded in the order of [I,,, P,,, R..., I]. Of course, the digital data is 1 - picture, B-picture and P-picture, respectively, recorded on the four tracks of the recording medium 100.

Method for recording a video signal according to the invention will be described below first with reference to Fig. 2. In Fig. 2 low-frequency data of I-picture, which represents the edge of the image recorded on the areas of recording low-frequency data 120, periodically formed on the four tracks that make up the I-picture. Low-frequency data of I-picture is also periodically recorded in low-frequency areas 120, periodically formed on the tracks of B-pictures and P-pictures. High-frequency data of I-picture recording on the areas of writing high-frequency data 110, periodically formed on the four tracks that make up the I-picture. Data P-images and P-images recorded in the part where there are no recorded low frequency data of the I-image areas.

Then W N images into a single group. Here N is any integer greater than one. The group is called group of pictures (GOP). The length of the track defined by the buffer size, or the length of the maximum size occupied by the data stored in the buffer) represents the remaining area of the write data 130, for each GOP. Thus, the data remaining in the buffer, write it to the rest of the data recording area 130 of the recording medium 100, every time when the operation of encoding the GOP. This allows you to fix the amount of data. Actually the amount of data loss is reduced because, when a special mode, a large enough area on the recording medium is used as a space for recording other data.

As described above, the low-frequency data of I-picture regularly recorded again on other tracks. Thus, in any mode, the enhanced speed of data loss is reduced. Of course, due to the use of only low-frequency data, the image quality decreases. However, if the image quality is reduced only slightly, the human eye cannot perceive in this mode, any higher speed. Accordingly, when the actual use of problems of the moving image, data at a rate of approximately 5 megabits per second can be used with success in special modes. That is, if the full amount of data less than 20 megabits per second, it is quite acceptable data rate to environment entries, such as magnetic tape.

As described above, in Fig. 2 low-frequency intra-frame data is written as a regular and recurring parts in the GOP. Therefore, the amount of data lost is quite small, although the recording medium is moving in the mode arbitrarily increased speed, so that you can obtain the restored image.

Next will be described below is another variant of embodiment of this invention.

In Fig. 3 shows the format of the tape according to another variant embodiment of the invention. As the tape format shown in Fig. 3, the same as that shown in Fig. 2, except for the following differences, these explanations will be omitted.

The difference between the variant embodiment according to Fig. 3 of a variant embodiment according to Fig. 2 is that the remaining area of the recording data in the buffer is not provided in the last part of the GOP. In the General case, for encoding and decoding the encoding process is independently performed in units of GOP. Therefore, the remaining area for sepiidae information buffer.

Next below with reference to Fig. 4A-C and Fig. 5 will be described a method for recording a video signal to achieve the other objectives of the invention.

As described above, this invention is directed to maintaining the functions of the special playback modes when sealing the moving image and recording it on tape, with more than just restoring the image in the search mode during fast-forward and rewind.

Generally speaking, it is difficult exactly to reproduce the image due to the characteristics of compacted digital information, even if the synchronization unit is bound to a certain area of the image. Considering this problem, this invention proposes a new method of recording, where the amount of data read by the magnetic head is increased, to obtain superior image reproduction. Based on the above described recording method, which share the same synchronization unit for low-frequency data and high frequency data, and writes the divided frequency data, this invention adopts the use of the method, which records not only the low-frequency data of a certain part of the image, but also low-frequency data from different parts of the image is tivaevae magnetic head increases, and information is evenly distributed throughout the image, the quality of the reproduced image in the special modes can be improved.

For this purpose, the image is firstly divided into several podsobranny, which are then rearranged at preassigned way. That is, one image is made up of several groups, and each group consists of several podsobranny.

There are two methods of grouping podsobranny. One group according to a certain rule, and the other group randomly randomly.

First, we describe the first method. One image can be divided into many podsobranny (or macroblocks), as shown in Fig. 4A in the case of the cinema program with the speed of rotation thirty frames per second. There are L podsobranny in the image, as can be determined from equation (1), which means that the image is H pixels in the horizontal direction and V pixels in the vertical and podsobirajte is h pixels in the horizontal direction and v pixels in the vertical direction.

L=[H/h] [V/v] (1)

Here the symbol [] represents the maximum integer not exceeding . Polysorbate are grouped as follows with Solsona Fig. 4A, B and C, when Polysorbate are numbered sequentially from left to right and top to bottom, and consistent Polysorbate divided by the divisor of a predetermined size, and the number has the same remainder, i.e. podsobirajte corresponding to the same residual set is classified in the same group.

Accordingly, the above-described method, one image is divided into a number of groups, thus it is recorded as the low-frequency data other podsobranny the same group and low-frequency data corresponding to Polysorbate in the area of recording low-frequency data 120 each Polysorbate belonging to the same group. Podsobirajte has a synchronization unit that represents podsobirajte. Accordingly, data groups, which are identical to each other, are recorded on the area for recording the low-frequency data 120 synchronization unit of each Polysorbate belonging to the same residual set, whereas the original data of each Polysorbate, i.e. the groups of data that are different from each other, are recorded on the area of recording high-frequency data 110. In other words, not only low NY set including podsobirajte are recorded in the recording area of the low-frequency data 120 each Polysorbate belonging to a certain residual set. At the same time in the recording area of high-frequency data 110 each Polysorbate, write only high-frequency data of the respective Polysorbate.

More information on this will be given below with reference to Fig. 4B and 5. It is assumed that there is an image consisting of sixteen podsobranny in General, as shown in Fig. 4B. In Fig. 4B is assumed that the dividend is L, i.e. the number of podsobranny, is 16. Low-frequency data Polysorbate recorded in the area of recording low-frequency data 120 each block synchronization in the case of MOD (L, 16). If MOD (L, 8) data area recording the low-frequency data 120 synchronization unit 1 coincide with those for synchronization unit 9. If MOD (L, 4), square recording low-frequency data 120 for sync blocks 1, 5, 9, and 13 have the same data.

If the above example to present in General and if MOD(L, n)= , the same information is recorded in the recording area of the low-frequency information blocks synchronization podsobranny whose sequentially assigned to the a of Fig. 5, where the synchronization unit comprises a synchronization scope, the identification area, the recording area of the low-frequency information 120, the recording area of high-frequency data 110 and compliance. Here, the synchronization code recorded in the synchronization scope, identification number of a specific Polysorbate recorded in the area of identification, error correction code recorded in the area of compliance. In addition, while high-frequency data specific Polysorbate for him is recorded in the recording area of high-frequency data 110, not only the low-frequency data of a certain Polysorbate for himself, but also low-frequency data other podsobranny classified as belonging to the same group of podsobranny are recorded together in the recording area of the low-frequency data 120. In the above description of the low-frequency data can contain either one DC component or DC component together with the low-frequency component of the AC.

On the other hand, can use the table-map as a method of random arbitrary grouping podsobranny as shown in Fig. 4C, using the method ISPI may be a little more competitive and flexible in the sense of improving the quality of the reproduced image at the point so podsobirajte can be mixed regularly or uniformly. That is, if the low-frequency data recorded together, to make the signal Polysorbate, distributed evenly across the image, the quality of the reproduced image when the special playback mode will be improved accordingly. The effect of this method of entry will vary depending on the density of recording on the tape. If the recording density is high enough due to further technical development, it will be possible to write much more low-frequency data podsobranny in the field of low-frequency recording 120 one Polysorbate that will significantly improve the image quality when the special playback modes.

As described above, the method of interframe coding can be effectively used in CVCR according to the invention, this method can fix the rate of issuance of data bits for recording on the tape. Also, this invention allows to reproduce images in a special mode, even if the recording medium is pulled with arbitrary faster if restimulated one block synchronization data other podsobranny, labretonie can raise the quality of the images when special playback modes by writing sites with low-frequency data of each Polysorbate, which belongs to the same group.

1. The method of recording images to a digital video tape recorder units of groups of pictures (GOP) consisting of an arbitrary combination of the I picture encoded using only information of the corresponding image, In the image encoded by using the compensating movement prediction from past and/or future reference picture, and P picture encoded using a compensating movement prediction from the past reference image, wherein the low-frequency data of each synchronization unit I-image recording at a certain distance on each track I-picture, B-picture and P-picture, high frequency data for each synchronization unit I-images are sequentially recorded in the unrecorded area of the tracks for the I-picture data of the P-image is sequentially written in the area that remains after the recording of low-frequency data of I-picture on the tracks for the P-image and the data image is sequentially written in the area that remains after the recording of low-frequency data of I-picture on the paths In the image.

the part highlighted at the end of the recording area of the image of each of the above-mentioned block GOP on track for a fixed number of data in each of the above-mentioned block GOP.

3. The method according to p. 2, wherein the predefined size of the write data on the tape corresponds to the storage capacity of the data output buffer to control the speed of the issuance of bits of compressed and encoded data.

4. The method of recording images to a digital video tape recorder in which the multiplexed digital video signal of each Polysorbate frame is divided into a predetermined number of podsobranny, divided into low-frequency data and high frequency data, so that the low-frequency data recorded on the tracks at a certain distance the length of the tape, and high-frequency data is sequentially recorded on the rest of the area tracks, characterized in that a predetermined number of podsobranny divided into many groups, respectively, a predetermined method, and then the low-frequency data of all podsobranny that belong to the same group, write together in the area for recording the low-frequency data of each Polysorbate, belonging to the same group.

5. The method according to p. 4, characterized in that the separation of the mentioned predetermined number of podsobranny mentioned on many groups, Polysorbate, equally. the manual on p. 4, characterized in that the separation of the mentioned predetermined number of podsobranny mentioned on many groups and their serial numbering from left to right and from top to bottom each serial podsobirajte is divided by the divisor of a pre-defined value, and podsobirajte assigned a serial number which has the same residue, are classified in the same group.

7. The method according to p. 4, characterized in that the low-frequency data contains only the DC component.

8. The method according to p. 4, characterized in that the low-frequency data contains a DC component and low-frequency parts component AC.

 

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