CN101072317A - Method and system for mpeg chroma de-interlacing - Google Patents
Method and system for mpeg chroma de-interlacing Download PDFInfo
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- CN101072317A CN101072317A CN 200710126415 CN200710126415A CN101072317A CN 101072317 A CN101072317 A CN 101072317A CN 200710126415 CN200710126415 CN 200710126415 CN 200710126415 A CN200710126415 A CN 200710126415A CN 101072317 A CN101072317 A CN 101072317A
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Abstract
A method (300) of converting interlaced Moving Picture Experts Group (MPEG) video signals to progressive video signals can include receiving an interlaced video signal representing a luma component specifying luma lines and a chroma component specifying chroma lines (310) wherein the chroma component can specify approximately one-half the number of lines of the luma component. The interlaced video signal can be decoded and the number of the chroma lines can be increased to approximately the same as the number of the luma lines (320). The number of chroma lines of the interlaced video signal then can be decreased (340), to substantially reverse the previous increase. The interlaced video signal then can be deinterlaced to produce a progressive video signal (350), which can be processed further (360) as needed.
Description
Technical field
The present invention relates to Video signal processing, in particular to the interlaced scanning video format conversion is become progressive video format, this is called interlacing scan and eliminates (deinterlacing).
Background technology
At present, many TV signal of emission and broadcasting all are progressive-scan signals.Many these signals are all launched with Motion Picture Experts Group's regulation (MPEG) form.For example, Advanced Television Systems Committee (ATSC) has developed digital television standard, and the signal that wherein is called the ATSC signal is launched with the MPEG form.Some ATSC signals are interleaved, for example 480i and 1080i vision signal.The form of these mpeg signals is so-called 4:2:0 forms.Therefore, these mpeg signals comprise the carrier chrominance signal of half spatial resolution on horizontal direction and the vertical direction, just the difference signal part of vision signal.In order to show this colourity and associated brightness (1uma), that is, redness, green and the blue portion arranged by matrix-style in the vision signal, colourity must be converted back to the form of 4:4:4.
Most MPEG decoders all are to export in form and interleaved luminance signal just to export chroma signal component after being complementary.Generally speaking, such MPEG decoder converts interleaved 4:2:0 carrier chrominance signal to the carrier chrominance signal of interleaved 4:2:2.If the carrier chrominance signal and the luminance signal that obtain are carried out interlacing scan elimination processing, and might convert different line numbers to, the vertical resolution of carrier chrominance signal just might descend, and eliminates processing if interlacing scan is carried out in the carrier chrominance signal that decoder is common output.
People are developing many new displays, and such as the display of plasma, LCD, LCOS and other " matrix " type, they are lined by line scan in essence, are not interleaved in other words.Therefore, except decoding, convert vision signal to the 4:2:2 form, then vision signal is carried out interlacing scan and eliminate processing, on many displays of lining by line scan in essence correctly beyond the display video signal, vision signal must experience further vertical format conversion.Will damage the vertical resolution of carrier chrominance signal so further.For example, for show this situation of 1080i signal on the 720p display, most MPEG decoders can convert each 270 carrier chrominance signal of going 4:2:0 to each 540 row by the interpolation of vertical direction.Generally speaking, the carrier chrominance signal of signal and luminance signal component all can experience interlacing scan and eliminate processing, produce the 1080p signal.So just damaged vertical resolution.In addition, luminance signal is from the 1080 downward conversions to 720 row, and the upwards conversion of carrier chrominance signal from 540 row to 720 row, also can damage vertical resolution further.The objective of the invention is to reduce this infringement.
Summary of the invention
Invention disclosed herein provides a kind of method and system, is used for that interleaved Motion Picture Experts Group (MPEG) vision signal is carried out interlacing scan and eliminates processing and vertical format conversion.According to scheme disclosed herein, before the chromatic component with interleaved vision signal carries out extends perpendicular, interleaved vision signal is carried out interlacing scan eliminate processing, keep chromatic component high-resolution in vertical direction.
On the one hand, the present invention can comprise a kind of method, is used for converting interleaved vision signal to progressive-scan video signal.This method comprises interleaved vision signal of reception, and this signal indication is determined the luminance component of brightness line number and the chromatic component of definite colourity line number.Chromatic component can be determined half of luminance component line number approx.Can decipher interleaved vision signal, the quantity of colourity row is increased to the line number that is approximately equal to the brightness row.The line number of interlaced video signal colourity row can subtract get back to the brightness line number approximate half, thereby upset increases the step of colourity row basically.Can carry out interlacing scan to interleaved vision signal then and eliminate processing.Therefore, the progressive-scan video signal of the chromatic component of the luminance component that can obtain representing determining the brightness row and definite colourity row eliminate is handled in interlacing scan.If desired, can also further handle progressive-scan video signal.
Another embodiment of the invention comprises a kind of method, is used for receiving interleaved 4:2:0 format video signal, converts interleaved MPEG vision signal to progressive-scan video signal.Can and convert interleaved 4:2:2 format video signal to interleaved 4:2:0 format video signal decoding.Interleaved 4:2:2 format video signal can be converted to interleaved 4:2:0 format video signal again, can carry out interlacing scan to it then and eliminate processing, obtains the progressive-scan video signal of 4:2:0 form.As long as need, can also further handle to the progressive-scan video signal of this 4:2:0 form.
On the other hand, the present invention includes a kind of method, be used for converting interleaved vision signal to progressive-scan video signal, comprise receiving the interlaced video signal that the chromatic component of the luminance component of brightness row and definite non-interlace colourity row is determined in expression.Can decipher interleaved vision signal.Can carry out interlacing scan to the colourity row of non-interlace and handle, the definite interlacing scan that generation was handled and the chromatic component of non-interlace colourity row.Can on the basis of brightness row and non-interlace colourity row, the interlaced video signal that obtains after deciphering be carried out interlacing scan eliminate processing.Interlacing scan is eliminated to handle and is obtained progressive-scan video signal, and the luminance component of brightness row and the chromatic component of definite colourity row are determined in expression.Can further handle this vision signal when needing as mentioned above.
On the one hand, the present invention includes a kind of MPEG decoder again, it has a colourity vertical interpolators, is used for receiving the interlaced video signal that expression is determined the luminance component of brightness row and determined the chromatic component of non-interpolation colourity row.This MPEG decoder can be deciphered interlaced video signal, and non-interpolation colourity row is carried out interpolation, the definite interpolation that generation was handled and the chromatic component of non-interpolation colourity row.Notice that the chromatic component of handling can be determined alternately interpolation colourity and non-interpolation colourity, thereby makes the chromatic component of handling can comprise all non-interpolation colourity row.
On the other hand, the present invention includes a kind of system, be used for converting interleaved MPEG vision signal to progressive-scan video signal.There is a decoder in this system, is used for receiving the interlaced video signal that the chromatic component of the luminance component of brightness row and definite colourity row is determined in expression.This chromatic component can determine the luminance component line number roughly half.This decoder can be deciphered interlaced video signal, and the quantity of colourity row is increased to the quantity that is substantially equal to the brightness row.This system also has an interlacing scan arrester, the colourity line number amount with interlaced video signal of being used at first reduce to the brightness line number roughly half, the step that will increase line number basically is conversely.The interlacing scan arrester carries out interlacing scan to interlaced video signal subsequently and eliminates processing.A processor can be arranged, coordinate the work of decoder and interlacing scan arrester.
Another embodiment of the invention comprises a kind of system, and it has a decoder, is used for receiving the luminance component of determining the luminance signal row and the interlaced video signal of determining the chromatic component of non-interpolation colourity row.Notice that this decoder can be deciphered interlaced video signal, and non-interpolation colourity row is carried out interpolation, produce the chromatic component of the processing of determining interpolation and non-interpolation colourity row.In this case, can comprise an interlacing scan arrester, on the basis of brightness row and non-interpolation colourity row the interlaced video signal after the decoding carried out interlacing scan elimination processing.In addition, a processor can also be arranged.This processor is used to coordinate the work of decoder and interlacing scan arrester.
Description of drawings
The preferred embodiment of having drawn among the figure, but obviously, the present invention is not limited to specific embodiments given here.
Fig. 1 is a block diagram, illustrates that the present invention disclosed herein becomes the interlaced scanning video format conversion example system of progressive scanned video form.
Fig. 2 is that explanation is with respect to the luminance signal row after deciphering, the spatial vertical figure of the 4:2:0 colourity row that produces in the decoder.
Fig. 3 is a flow chart, and it illustrates that an illustrative methods of handling is eliminated in the interlacing scan of MPEG colourity in the scheme disclosed herein.
Fig. 4 illustrates the system that another is exemplary, and this system is used for according to scheme disclosed herein the interlaced scanning video format conversion being become the progressive scanned video form.
Fig. 5 is a flow chart, illustrates that another illustrative methods of handling is eliminated in the interlacing scan of MPEG colourity among the present invention.
Embodiment
Disclosed hereinly the invention provides a kind of method and system, be used to carry out interlacing scan and eliminate and handle, and interlacing scan Motion Picture Experts Group (MPEG) vision signal is carried out the vertical format conversion.According to the solution of the present invention disclosed herein, before the chromatic component of extends perpendicular interlaced video signal, interlaced video signal is carried out interlacing scan eliminate processing.Therefore, the present invention carry out that interlacing scan eliminate to be handled and the conversion of colourity vertical format in, can keep the vertical resolution (just 50% of maximum luminance signal vertical resolutions) of chromatic component.
Fig. 1 is a theory diagram of example system 100, and this system is used for the interlaced scanning video format conversion is become the progressive scanned video form.As shown in Figure 1, system 100 comprises that a MPEG 2 110, one of video decoder modules (decoder) are interlaced to 120 and processors 105 of progressive scanned video treatment system (interlacing scan arrester).Decoder 110 can be deciphered the interlacing scan 4:2:0 form MPEG vision signal of receiving, and converts interleaved 4:2:2 format video signal to.Obviously, interlacing scan arrester 120 can convert the vision signal of 4:2:2 form to the vision signal of 4:2:0 form before vision signal being carried out interlacing scan elimination processing.Finish after the conversion, interlacing scan arrester 120 can convert the vision signal of having changed form to progressive-scan video signal.Processor 105 can be coordinated the work of decoder 110 and interlacing scan arrester 120.Above-mentioned each component can connect by suitable data, and for example data communication bus or other connecting circuit communicate connection.At last, this system also has an imaging system or display 130, such as high definition TV (HDTV) receiver with liquid crystal over silicon (LCOS) display or other suitable imager of lining by line scan.
System 100 can receive interlacing scan MPEG vision signal, and it is converted to has the very progressive-scan video signal of high chroma vertical resolution.In work, decoder 110 can receive the vision signal of interlacing scan MPEG 4:2:0 form.Decoder 110 can be deciphered this interlacing scan mpeg signal, and this conversion of signals is become the signal of interlacing scan 4:2:2 form.According to the present invention, the interlacing scan arrester is changed back interleaved 4:2:0 format signal with the 4:2:2 interleaved signal, thereby the 4:2:0 that the decoder 110 that will reverse carries out is to the switch process of 4:2:2.Then, interlacing scan arrester 120 is according to the interleaved 4:2:0 format video signal of the sequential processes of the best.Particularly, 120 couples of interlacing scan 4:2:0 of interlacing scan arrester format video signal carries out interlacing scan and eliminates processing, converts the 4:2:0 format video signal of lining by line scan that obtains to the 4:2:2 format video signal of lining by line scan.That is to say that the line number of chromatic component can be expanded into the line number of the luminance signal component of the progressive-scan video signal that equals to obtain.According to the vertical resolution of the display of wanting receiving video signals, further handle this vision signal when needing.
The expansion of colourity line number is just eliminated the 4:2:0 vision signal of handling with interlacing scan and is converted the 4:2:2 format video signal to, can be with showing on the 720p display that the 1080p signal of 4:2:0 form is illustrated.Suppose that according to above-described mode vision signal having been carried out interlacing scan eliminates processing, upwards changes to 540 with the colourity line number from 270.Can handle this vision signal with multiple technologies.In one embodiment, the luminance signal line number can change to 720 downwards from 1080, and the colourity line number can upwards change to 720 from 540.In addition, not that the colourity line number is upwards changed to 720 from 540, but the colourity line number is upwards changed to 1080 from 540.According to this embodiment, luminance signal can be changed to 720 row downwards from 1080 row then, the colourity line number also can change to 720 downwards from 1080.Though adopted the 720p display in order to describe, having in the multiple display of complete different resolution any one can use.Therefore, should be understood that luminance signal and carrier chrominance signal can upwards become, also can become downwards, so long as allow luminance signal line number and colourity line number equate just substantially.Used exploration on display resolution ratio is depended in this processing to a great extent.
With reference to system illustrated in figures 1 and 2, as shown in Figure 2, when traditional MPEG decoder is handled the mpeg signal of receiving and is carried out interlacing scan output, the output of luminance signal former state, but carrier chrominance signal will be to up-converting into the same identical line number that has with luminance signal, and with it on same upright position.In other words, with the MPEG 4:2:0 interleaved signal decoding of receiving, and upwards be transformed into the 4:2:2 interleaved signal.Decoded device be used for for the 3rd row of luminance signal and an example process of the 5th row generation carrier chrominance signal can be to utilize A capable and capable Cr3 of obtaining of C and Cr5.For example, the MPEG decoder can be provided with:
Cr3＝(5/8)A+(3/8)C Cr5＝(1/8)A+(7/8)C
The MPEG decoder will be in the same way for top field obtains all the other 4:2:2 colourity row, and it is from suitable 4:2:0 colourity row.
Equally, for bottom field, the MPEG decoder obtains Cr4 and Cr6 by following setting from B and D:
Cr4＝(7/8)B+(1/8)D Cr6＝(3/8)B+(5/8)D
The present invention changes back 4:2:0 interlacing scan row again with 4:2:2 interlacing scan row.For example, can reconstitute A and C from Cr3 and Cr5 in such a way:
A＝(1/4)(7*Cr3-3*Cr5) C＝(1/4)(5*Cr5-Cr3)
For bottom field, can be in such a way from Cr4 and Cr6 reconstruct B and D:
B＝(1/4)(5*Cr4-Cr6) D＝(1/4)(7*Cr6-3*Cr4)
Certainly be noted that and calculate equally with A from Cr3 and Cr5 that C also can calculate (not drawing the figure) from Cr7 and Cr9.This just means and can once calculate, and is used for all colourity row of one.There are many methods to realize these equatioies, if decoder adopts different equatioies in its 4:2:2 conversion, will be conversely for 4:2:2 with these equatioies to the conversion of 4:2:0.
Fig. 3 is a flow chart 300, and its explanation MPEG carrier chrominance signal interlacing scan that the present invention carried out shown in Figure 1 is eliminated and handled illustrative methods.This method begins from step 310, receives interlacing scan MPEG vision signal.Vision signal can be the vision signal of 4:2:0 form.Particularly, the colourity line number of vision signal chromatic component can be approximated to be half of video luminance signal signal component luminance signal line number.In step 320, can decipher interleaved 4:2:0 vision signal, and convert it to interleaved 4:2:2 format video signal.That is to say that generally speaking, decoder is not only to the decoding of the vision signal received, also will increase or, make its identical with luminance signal component basically to the colourity every trade number of up conversion chromatic component.
In step 330, the vision signal of the interlacing scan 4:2:2 form that obtains can be offered the interlacing scan arrester.In step 340, interlaced video signal can be changed back interlacing scan 4:2:0 format video signal.Notice that as shown in Figure 2, the interlacing scan arrester can be changed carrier chrominance signal downwards, the colourity processing procedure of the decoder that perhaps overturns effectively.Therefore, the quantity of colourity row can be reduced to the luminance signal row approximate half.In step 350, can carry out interlacing scan to interleaved 4:2:0 format video signal subsequently and eliminate processing.In step 360, to have avoided after the vertical resolution decline, the words that need can further be handled the recursive video signal that obtains.For example, the progressive-scan video signal that obtains can be converted into the vision signal of 4:2:2 form or the vision signal of 4:4:4.The vertical format of signal can be changed according to the vertical resolution of display according to previously described mode.In step 370, passed through after all essential processing at last, vision signal has been offered display for watching.After step 370 is finished, can repeat the step of this method, handle more vision signal.
Fig. 4 is the theory diagram of another example system 400 of explanation, and this system is used for the interlaced scanning video format conversion is become the progressive scanned video form.System 400 basically with system similarity shown in Figure 1, it has a decoder 410, interlacing scan arrester 420, a processor 405 and a display 430.But obviously, decoder 410 can have an improved MPEG decoder carrier chrominance signal vertical interpolators 415.According to this scheme of the present invention, decoder can be exported a vision signal, and some of them colourity output row does not have interpolation, all original 4:2:0 colourity provisional capitals can appear at as in the selected output constantly in the output signal of non-interpolation line.In this case, interlacing scan arrester 420 does not need to be configured to be used for reducing the quantity of colourity row, allows it be substantially equal to the quantity (conversion of signals of 4:2:2 form being returned the vision signal of 4:2:0 form) of luminance signal row.In one embodiment of the invention, not again the converting video signal, but can be an original 4:2:0 colourity row in every line in the decoder output carrier chrominance signal that the row between them can be an interpolation line.Therefore, interlacing scan arrester 420 can be ignored interpolation colourity row, keeps original colourity row.In this way, can eliminate the maximum chrominance signal vertical resolution that keeps rest image (non-motion) in the processing output signal in interlacing scan.
Fig. 5 is a flow chart 500, and it illustrates the MPEG colourity interlacing scan elimination processing illustrative methods in embodiment of the present invention shown in Figure 4.This method can be from step 510, and interlacing scan MPEG vision signal wherein is received.Vision signal can be the vision signal of a 4:2:0 form, and wherein the colourity every trade number of chromatic component is approximately half of video luminance signal signal component luminance signal line number.In step 520, interlaced video signal is deciphered.The quantity of colourity row can increase by interpolation.The colourity line number and the luminance signal that are called the vision signal that this process to the up conversion carrier chrominance signal obtains, the vision signal of interlacing scan 4:2:2 form for example, the line number amount the same substantially.Notice that the vision signal that obtains can comprise original or non-interpolation colourity row.In one embodiment of the invention, all original 4:2:0 colourity provisional capital can engrave as the output signal of non-interpolation line selected the time.For example, decoder output carrier chrominance signal in every line can be former the beginning of non-interpolation colourity row, and the row between them can be an interpolation line.
In step 530, can carry out interlacing scan to vision signal and eliminate processing.But be noted that the colourity row that in this process, can abandon or ignore interpolation.Therefore, except the luminance signal row, have only non-interpolation colourity row to handle.In step 540, avoided after the infringement vertical resolution, can eliminate the vision signal of handling to interlacing scan and be further processed, as above-mentioned.For example, progressive-scan video signal can be converted into the vision signal of 4:2:2 or 4:4:4 form.In addition, can also come the vertical format of switching signal according to the particular display of display video signal.At last, in step 550, the vision signal that obtains can be offered imaging system or display.Also have, can also repeat this method when needing, further handle vision signal.
The present invention disclosed herein can be embedded into other concrete form and can not depart from essence of the present invention.Therefore, should be as the criterion with following claim, rather than the explanation of front.
Claims (12)
1. one kind is converted to the method for progressive-scan video signal with interleaved Motion Picture Experts Group (MPEG) vision signal, and described method comprises:
Receive the formative vision signal of (310) interleaved 4:2:0;
The formative vision signal of described interleaved 4:2:0 is deciphered (320), and described vision signal is converted to the formative vision signal of interleaved 4:2:2;
The formative vision signal of described interleaved 4:2:2 is changed (340) again be the formative vision signal of interleaved 4:2:0; With
The formative vision signal of described interleaved 4:2:0 is carried out interlacing scan eliminate (350), thereby obtain the formative progressive-scan video signal of 4:2:0.
2. the described method of claim 1, the wherein said step of conversion again comprises the colourity row of removing in the formative vision signal of described interleaved 4:2:2.
3. the described method of claim 1, wherein this method comprises that further vertical format changes the formative vision signal of lining by line scan of described 4:2:0, so that show on the display with the vertical resolution that is different from the formative progressive-scan video signal of described 4:2:0.
4. the described method of claim 3, wherein this method further comprises provides progressive-scan video signal of (550) described vertical format conversion to give imaging system (130).
5. the described method of claim 4, wherein said imaging system (130) comprises the liquid crystal over silicon imager.
6. the described method of claim 4, wherein said imaging system (130) further comprises high-definition TV receiver.
7. one kind is converted to the equipment of progressive-scan video signal with interleaved Motion Picture Experts Group (MPEG) vision signal, and described method comprises:
Be used for receiving the device of the formative vision signal of (110) interleaved 4:2:0;
Be used for the formative vision signal of described interleaved 4:2:0 is deciphered (110) and described vision signal is converted to the device of the formative vision signal of interleaved 4:2:2;
Be used for that the formative vision signal of described interleaved 4:2:2 is changed (120) again and be the device of the formative vision signal of interleaved 4:2:0; With
Be used for thereby the formative vision signal of described interleaved 4:2:0 is carried out that (120) are eliminated in interlacing scan the device that obtains the formative progressive-scan video signal of 4:2:0.
8. the described equipment of claim 7, the wherein said device that is used for changing again comprise the device of the colourity row that is used to remove the formative vision signal of described interleaved 4:2:2.
9. the described equipment of claim 7, wherein this equipment further comprise be used for that vertical format is changed the formative vision signal of lining by line scan of described 4:2:0 in case on display with the vertical resolution that is different from the formative progressive-scan video signal of described 4:2:0 device shown.
10. the described equipment of claim 7, wherein this equipment further comprises and is used to provide progressive-scan video signal of (550) described vertical format conversion to give the device of imaging system (130).
11. the described equipment of claim 10, wherein said imaging system (130) comprises the liquid crystal over silicon imager.
12. the described equipment of claim 10, wherein said imaging system (130) further comprises high-definition TV receiver.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US25772300P | 2000-12-22 | 2000-12-22 | |
| US60/257723 | 2000-12-22 | ||
| US60/259531 | 2001-01-03 | ||
| US10/003565 | 2001-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB018211836A Division CN1330181C (en) | 2000-12-22 | 2001-12-10 | Method and system for MPEG chroma de-interlacing |
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| CN101072317A true CN101072317A (en) | 2007-11-14 |
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