CN1068493C

CN1068493C - Pictorial data rocording method for high definition video cassette tape recorder

Info

Publication number: CN1068493C
Application number: CN95107649A
Authority: CN
Inventors: 崔炳胡
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 1994-06-24
Filing date: 1995-06-23
Publication date: 2001-07-11
Anticipated expiration: 2015-06-23
Also published as: JP2769302B2; CN1120774A; JPH0884316A; KR960002298A; KR0162307B1

Abstract

In a video data recording method for a digital video cassette tape recorder, wherein bit streams of video data are initially stored in video segments having remaining spaces, portions of the bit streams which are not initially stored in the video segments being sequentially stored in a memory as remaining bit streams, the video data recording method includes the steps of first comparing a size of the last remaining space of the video segments with a size of one remaining bit stream, second comparing the size of the last remaining space with a size of a next remaining bit stream based on the first comparison result, repeating the second comparing step until a remaining bit stream having a size which is not larger than the size of the last remaining space of the video segments is found, and storing the remaining bit stream found in the repeating step in the last remaining space of the video segments.

Description

The record image data method of high definition video tape recorder

The present invention relates to a kind of image data recording method that is used for high definition video cassette recorder (being designated hereinafter simply as " HDVCR "), particularly a kind of image data recording method that the high definition video cassette recorder has been improved, it can very dense ground by improving formatting method writes down the view data that has been compressed on video tape.

Referring to Fig. 1, the image data recording method of conventional high definition video cassette recorder comprises a discrete cosine conversion circuit 1, it is to be provided with for view data IVD that discrete cosine transform is input to this place, a sample circuit 2, it is to establish from the dateout that discrete cosine conversion circuit/output comes for quantizing, a variable length code circuit 3, it is to establish from the dateout with the form of bit stream that sample circuit 2 output comes for variable length code, a formating circuit 4, it is to be provided with for the dateout that 3 outputs of variable length code circuit are come is formatted as a kind of data pattern that is recorded on the tape T, an error correction code circuit 5, it is provided with in order to give the additional self-correcting code of dateout of coming from formating circuit 4 outputs, a record amplifying circuit 6, it be for amplify the dateout of coming from error correction code circuit 5 output and for the data that will amplify by magnetic head H ₁Be recorded in that tape T goes up and be provided with, a reproducing amplifier circuit 7, it is to be to amplify through magnetic head H ₂Tape T on record data establish, an error correction decoding circuit 8, it is decoded and proofreaies and correct decoded view data the additive error correcting code on reproduction amplifying circuit 7 dateouts and is provided with, one is removed formating circuit 9, it is to turn to original data mode from the dateout of error correction decoding circuit 8 outputs and the data format that will receive and be provided with for receiving, a length-changeable decoding circuit 10, it is to establish from the dateout of going formating circuit 9 outputs for length-changeable decoding, an inverse quantization circuit 11, it is established from the dateout of length-changeable decoding circuit 10 for inverse quantization, and an inverse discrete cosine transformation circuit 12, it is provided with from the dateout of inverse quantization circuit 11 and in order to export original view data OVD for inverse discrete cosine transformation.

The work of conventional high definition video cassette recorder will be explained in reference Fig. 2 to Fig. 4.

At first, when placing manner of playback, when the view data IVD of a frame picture is input to discrete cosine conversion circuit 1, as shown in Figure 2, discrete cosine conversion circuit 1 is transformed to 2 chromatic component DCT piece Crs and a C who comprises 4 luminance component DCT piece Y (seeing Fig. 2 A) with view data IVD through the process that moves gradually _DMacro block.Here, a section piece comprises 5 macro blocks.Just, a section piece comprises 30 DCT pieces.

In addition, comprise that the view data by a cell block of discrete cosine conversion circuit 1 is quantized circuit 2 compressions and is input to variable length code circuit 3.

After this, variable length code circuit 3 scan each DCT piece in a kind of zigzag mode and after variable length code with the form output image data of bit stream, and have formating circuit 4 to finish the formatting step, so that the bit stream that will export one by one is recorded on the tape T.

Here, as shown in Figure 4, above-mentioned formatting step will be done more detailed explanation, and it comprises three steps.

At first, first process is to export from variable length code circuit 3 at bit stream, and as shown in Figure 3A, bit stream is stored in the macro block of " j=0 " with being compressed.

That is exactly, and the bit stream of " A1+A " is stored in the DCT piece of memory cell (0,0) i.e. " j=0, i=0 " with being compressed.The bit stream of " B1 " is stored in the DCT piece of a memory cell (0,1) with being compressed." C1 " bit stream is stored in the memory cell (0,2) with being compressed." D1+D " bit stream is stored in the memory cell (0,3) with being compressed." E1 " bit stream is stored in the memory cell (0,4) with being compressed." F1 " bit stream is stored in the memory cell (0,5) with being compressed.

Be stored in six DCT pieces each bit stream among each with being compressed, in Fig. 3 B, be expressed as among the macro block of " j=0 ", be stored in the DCT piece of 6 compressional zones among the video unit that is formed at " j=0 "-step 2.

Just, be stored in memory cell (0 with being compressed, 0) the bit stream A1 in the DCT piece in is stored among the DCT piece of the compressional zone in the memory cell of " j '=0; i '=0 "-step 2, and the bit stream B1 that is stored in the memory cell (0,1) is stored in memory cell (0 with being compressed with being compressed, 1) in the DCT piece in-step 2, and the bit stream C1 that is stored in the DCT piece of (0,2) is stored in the DCT piece of the compressional zone in the memory cell (0,2) with being compressed with being compressed.

In addition, be stored in (0 with being compressed, 3) the bit stream D1 in the DCT piece is stored in (0 with being compressed, in the DCT piece of compressional zone 3), the bit stream E1 that is stored in the DCT piece of (0,4) is stored in (0 with being compressed with being compressed, in the DCT piece of compressional zone 4), and the bit stream F1 that is stored in the DCT piece of (0,5) is stored in the DCT piece of (0,5) compressional zone with being compressed with being compressed.

In addition, as shown in Figure 3, comprise that the DCT piece of 6 compressional zones can comprise full district and dead zone.

Here, shown in Fig. 3 B, in memory cell (0,0), the video-frequency band in (0,3) is after this place is filled up, and remaining bit stream A ' and D are stored among the memory MR (0) one by one, shown in Fig. 3 G-and step 3.

In addition, be stored in bit stream in 6 DCT pieces in the macro block of " j=1 " is stored in the DCT piece of 6 compressional zones in the video unit of " j '=1 "-step 2 with being compressed respectively, and after the DCT piece was filled, remaining bit stream was stored among the holder MR (1)-step 3.

In addition, be stored in bit stream in the DCT piece in remaining macro block is compressed in the DCT piece that is stored in 6 compressional zones in the corresponding video unit-step 2 with being compressed, and after the DCT of 6 compressional zones piece was filled, remaining bits stream was stored in memory MR (2) respectively to MR (4).

Here, shown in Fig. 3 B, each end of the bit stream in being stored in each DCT piece provides the mark of an EOB, the i.e. end of piece (End of Block).

In addition, as shown in Figure 2, the formation in video unit district comprises 4 luminance component districts, and each has 14 bytes; With 2 chromatic component districts, each has 10 bytes.

Secondly, second process is being stored in to the remaining bits stream among each of MR (4) in the space of sky of video unit of " j '=0 "-step 4 being stored in memory MR (0) shown in Fig. 3 D with being compressed with being compressed, more than said be that remaining bits stream in step 3 is stored in the situation of memory MR (0) to each of MR (4).

In addition, be stored in remaining memory MR (1) is stored in to the bit stream among the MR (4) in the space of sky in each video unit district with being compressed.

Just, as mentioned above, be stored in bit stream among the memory MR (0) is stored in the space by the sky in the video unit district of " j '=0 " of the order from " i '=0 " to " i '=5 "-step 4 with being compressed, and be stored in bit stream among the memory MR (1) and be stored in the video unit district by " j '=1 " of order-step 4 with being compressed from " i '=0 " to " i '=5 ", and be stored in remaining memory MR (2) be stored in each video unit district in the aforesaid same mode to the bit stream of MR (4) with being compressed in-step 4.

In addition, shown in Fig. 3 D, after the bit stream in being stored in memory MR (0) is stored in the space of sky of video unit of " j '=0 ", remaining bits stream A " is stored among the memory VR shown in Fig. 3 E-step 5.

Also have, be stored in after the bit stream of memory MR (1) to MR (4) be stored in each empty space in video program section zone, remaining bits stream quilt is stored among the memory VR-step 5 one by one.

The 3rd is, the 3rd process is shown in Fig. 3 F, in step 5, be stored in bit stream among the memory VR and be stored in one by one in the video unit district according to " j '=0 " of order, and be stored in one by one respectively in the video unit district according to " j '=1 " of order-step 6 from " i '=0 " to " i '=5 " from " i '=0 " to " i '=5 ".

After this, in bit stream is stored in by each the video unit district in the above-mentioned order after, the size in the space of the sky of remaining last DCT piece and the size that will be stored in the bit stream in the DCT piece are compared mutually-step 7.

Result relatively, if the size in the space of the sky of DCT piece greater than that size of comparing with it, then bit stream is stored in the above-mentioned video-frequency band zone-step 8.Its result, if the size in the space of the sky of DCT piece is less than that size of comparing with it, so, the bit stream that is stored in the bit stream in the video-frequency band and be stored among the memory VR all is eliminated, and the remaining area of video-frequency band keeps dummy status-step 9.

As mentioned above, be formatted as the data mode that can be recorded on the tape T from the formatted circuit 4 of view data of variable length code circuit 3 outputs, and this formative view data is output to error correction code circuit 5, and is additional here with self-correcting code.

In addition, the view data of additive error correcting code is recorded that amplifying circuit 6 is amplified and by magnetic head H ₁Be recorded on the tape T.

Simultaneously, when according to ' reproduction ' working method, being recorded in data on the tape T is reproduced amplifying circuit 7 and is reappeared, error correction decoding circuit 8 solves self-correcting code that is attached to playing data for broadcasting and the error of proofreading and correct regenerate image data, then, be original state by the formating circuit 9 that goes that receives the data of having proofreaied and correct error with the record format state transformation.

At this moment, receive from the length-changeable decoding circuit 10 of the dateout of going formating circuit 9 outputs and recover view data according to variable-length code (VLC), and finish inverse quantization by 11 pairs of data recovered of inverse quantization circuit, compressed thus view data is decompressed.

After this, receiving the data that are input to the there from 12 pairs in the inverse discrete cosine transformation circuit of the dateout of inverse quantization circuit 11 outputs finishes inverse discrete cosine transformation and exports original view data.

But, because the conventional clear high VCR image data recording method of degree is to deposit in the space of sky of each section being stored in view data in the memory, and, since be stored in the memory view data view data be stored in the there after, the size in the space of the last sky of remaining video section will be eliminated when being recorded in view data in the video-frequency band big or small, the space of the sky of video-frequency band keeps blank thus, and the space of the record of tape can not be effectively utilized, and picture quality is very poor when reappearing.

Therefore, purpose of the present invention just provides the image data recording method of a kind of high definition video tape recorder (HD-VCR), and it has overcome the problem that is run in the HD of routine VCR image data recording method.

Other method of the present invention provides the image data recording method of a kind of HD VCR that has improved, and it is recorded on the recording section of video tape by improving formatting method with making compressed view data very dense.

In order to achieve the above object, the image data recording method of a high definition video tape recorder is provided here, the high definition VCR image data recording method that it is characterized in that digital VCR, wherein, bit stream corresponding to the view data of a DCT piece is stored, remaining bit stream is stored in the remaining space of remaining DCT piece, and remaining bit stream is sequentially to be stored in the remaining space of DCT piece, image data recording method comprises that selection can be stored in the step of the remaining bits stream in the DCT piece remaining space.

In order to achieve the above object, the present invention also further comprises some following steps: first step sequentially will be stored in view data in the DCT piece with being compressed and exist in the corresponding video-frequency band zone and store remaining bit stream in first memory or the 5th memory; Second step deposits the view data of being stored in first to the 5th each memory in the empty video-frequency band and with remaining view data in and to be stored in the 6th memory; Third step, order deposits the bit stream that is stored in second step in the 6th memory in empty video-frequency band, still has remaining space up to a DCT piece; The 4th step compares the size of the size in the space of the sky of DCT piece last in the third step and the remaining view data next time in the space; And the 5th step, when the result of the 4th step is, absolutely empty of video-frequency band during greater than the view data that will be stored in the space, the store images data are in absolutely empty.And when the capacity in the space of video-frequency band less than will be stored in view data in the space big or small the time, remove after the bit stream of a piece that comprises a view data, repeatedly carry out the 4th step.

Fig. 1 illustrates the calcspar of structure of the HDVCR of a routine.

Fig. 2 A illustrates the diagram of the view data of a frame picture that comprises 30 DCT, and these DCT are transfused to each unit to Fig. 1.

Fig. 2 B illustrates the diagram in 30 video-frequency band zones, and each is corresponding to 30 DCT pieces of Fig. 2 A.

Fig. 3 A illustrates the formatting process in the video-frequency band zone of Fig. 2 B to 3F, and the bit stream in Fig. 2 B in DCT piece that is stored in Fig. 2 A is compressed with being compressed.

Fig. 4 is the flow chart of a routine.

Structure chart of Fig. 5, it shows according to the present invention, data are stored in the structure in the memory.

Fig. 6 is a flow chart according to high definition VCR image data recording method of the present invention.

Referring to Fig. 6, a high definition video tape recorder image data recording method according to the present invention comprises: first process, and it will be stored in bit stream in the DCT piece one by one with being compressed and deposit the remaining bits stream that (step 2) also will obtain in corresponding section the zone in deposit memory MR (0) in to MR (4) after step 2; Second process, it will be stored in the bit stream of memory MR (0) to MR (4) and deposit among absolutely empty of video-frequency band that (step 4) also deposits the remaining bits stream of obtaining after the step 4 in the memory VR in; The 3rd process, it will be stored in that bit stream among the memory VR deposits in absolutely empty of video-frequency band one by one and absolutely empty capacity of the remaining video section that obtains after the step 6 will be compared with the size that will be stored in the coded word in absolutely empty; The 4th process, it is characterized in that: the result of the 3rd process, when absolutely empty of video-frequency band during greater than coded word big or small, be included in bit stream in the code word and deposited in (step 11) in absolutely empty of video-frequency band, and when absolutely empty of video-frequency band during less than coded word big or small, the bit stream that with EOB is tail comprises that corresponding coded word is eliminated (step 8), and next coded word is scanned (step 9), and the two mutual comparison of absolutely empty capacity of the size of the coded word that is scanned and video-frequency band; The 5th process is in the result of step 4, when the size of the coded word that is scanned during greater than absolutely empty of video-frequency band capacity, repeatedly completing

steps

8,9,10 and when the size of the coded word that is scanned during less than absolutely empty of video-frequency band capacity, store involved bit stream in the space of video-frequency band.

Will be in below with reference to Fig. 1 according to the work of high definition VCR image data recording method of the present invention, 2 and 5, make an explanation.

At first, when placing the writing task mode, as shown in Figure 2, when the view data IVD of a two field picture is input to discrete cosine conversion circuit 1, discrete cosine circuit 1 will be input to there view data IVD and be transformed to data with a kind of form of the macro block that comprises 4 luminance component DCT piece Y and 2 chromatic component DCT piece Cr and Cb, and therefore a cell block is formed by five macro blocks.

In addition, the view data that is formed with the form of a cell block by discrete cosine conversion circuit 1 is quantized circuit 2 and compresses and be input to variable length code circuit 3.

After this, variable length code circuit 3 with a kind of zigzag mode scan each be input to DCT piece there and after variable length code with a kind of form dateout of bit stream, and formating circuit 4 is with bitstream formatization, so that be recorded on the tape T.

Here, as shown in Figure 6, because first process is identical with the process of previously described routine with second process, so omit.

As the front is described in the description of the technology of routine, be stored in (step 5) absolutely empty of each video-frequency band from the bit stream of first and second processes output, with after step 5, the remaining bits stream of obtaining is stored among the memory VR, and is stored in bit stream among the memory VR and is stored in absolutely empty of video-frequency band-step 6.

At this moment, absolutely empty capacity 5 of the last video-frequency band of step 6 will be stored in the bit stream in absolutely empty coded word size the two compared mutually-step 7.The result of above-mentioned comparison, when absolutely empty capacity during greater than the coded word of the bit stream that will be stored in the space big or small, the bit stream that is included in the coded word is deposited in video-frequency band-step 11.

The capacity of the data that here, coded word means that a kind of form with bit stream exists has been compressed.

Simultaneously, as shown in Figure 5, the bit stream in " A " point range in being stored in memory VR is stored in last absolutely empty when interior of video-frequency band, so whole space of video-frequency band all is filled, owing to the capacity of the bit stream to " A " point range less than a coded word, just less than the bit stream of a view data, this does not just need data are deposited in the video-frequency band.

The result of step 7, when absolutely empty capacity of video-frequency band during less than the capacity of the coded word that will be stored in the bit stream in absolutely empty, bit stream to the EOB scope, this EOB represents to be stored in the end of a piece in the memory VR, be eliminated-step 8, and the coded word of next piece is scanned-step 9.

After this, absolutely empty capacity of video-frequency band and through the capacity of the coded word of step 9 scanning the two is compared mutually-step 10.Step 10 result relatively, when the capacity of coded word during greater than absolutely empty of video-frequency band capacity, step 8 is repeatedly carried out to step 10.When the capacity of coded word during less than absolutely empty of video-frequency band capacity, the bit stream that comprises the respective coding word is deposited in absolutely empty of video-frequency band-step 11.

Be transformed to a kind of form that is stored on the tape T from the formatted circuit 4 of view data variable length code circuit 3 output, that exist with a kind of form of bit stream, this formatted view data has been added a self-correcting code by error correction code circuit 5 then.

In addition, the view data of having been added self-correcting code is recorded that amplifying circuit 6 is amplified and by magnetic head H ₁Be recorded on the tape T.

Simultaneously, when placing ' reproduction ' working method, when data that are recorded were reproduced amplifying circuit 7 and are reappeared, error correction decoding circuit 8 solved the additional error of giving the self-correcting code of playing data for broadcasting and proofreading and correct the view data of reproduction.Receiving, the formating circuit 9 that goes of the data of correction error is original state with the record format state transformation.

At this moment, receive from the length-changeable decoding circuit 10 of the dateout of going formating circuit 9 outputs and recover view data according to variable-length code (VLC), and the data that are resumed of inverse quantization circuit 11 inverse quantizations, therefore, compressed view data is disengaged compression.

After this, inverse discrete cosine transformation circuit 12 (receiving from the dateout of inverse quantization circuit 11 outputs) is finished anti-cosine transform and is exported original view data.

As mentioned above, a kind of high definition VCR image data recording method according to the present invention than routine techniques more images data, deposits in video program's section, thereby has directly improved picture quality by utilizing absolutely empty of video-frequency band.

Claims

1. imagery data recording method, being used for storing the cassette tape digital VTR should is characterized in that in the method for the pictorial data bit stream of DCT piece, comprises step:

The bit stream that will be stored in the view data among the DCT piece one by one is stored in the corresponding video-frequency band zone with being compressed;

Deposit remaining bits stream in memory;

The bit stream of video data stored in the memory is deposited in the empty video-frequency band, and remaining view data is deposited in the memory (VR);

One by one the bit stream of storing in the described memory (VR) is deposited in the empty video-frequency band and remaining space is arranged up to a DCT piece; And

The suitable bit stream that the remaining bits of storing in the memory (VR) is flowed deposits in the space of last DCT piece sky.

2. method according to claim 1, it is characterized in that, after the size of the bit stream of the size of the remaining space of more last DCT piece and next view data, store described suitable bit stream, when comparative result is the space hour of DCT piece, after removing comprises the bit stream of a piece of next pictorial data, described step forwards the step that repeats next pictorial data bit stream size of comparison to, when comparative result is the size of DCT piece when being big, then carry out the step of stored bits stream.

3. method according to claim 1 is characterized in that: the number that is used to store the memory of residual graph image data bit stream is five, and remaining bits stream exists among the 1st to the 5th memory.