CN100369458C

CN100369458C - Efficient checking method for adjacent macroblock of digital multimedia broadcasting video decoder

Info

Publication number: CN100369458C
Application number: CNB200510033045XA
Authority: CN
Inventors: 金相哲
Original assignee: LG Electronics Huizhou Co Ltd
Current assignee: LG Electronics Huizhou Co Ltd
Priority date: 2005-01-26
Filing date: 2005-01-26
Publication date: 2008-02-13
Anticipated expiration: 2025-01-26
Also published as: CN1812485A

Abstract

The present invention relates to an efficient detecting method for adjacent macro blocks of a digital multimedia broadcasting video decoder, which comprises a step of comparing the subtracted number value of the address of the decoding macro block 1 with the address of the initial macro block in a slice of the decoding macro block, and a step of judging the decoding macro block and the adjacent left macro blocks in the same slice when the compared result of the step is that the subtracted number value 1 is larger than or equal to the address of the original macro block. Each macro block of the present invention does not need to have the slice number. The condition that adjacent macro blocks are contained in the same slice or not is conformed by the number of the macro block in the horizontal direction and addresses of the initial macro blocks of the corresponding slices. The unnecessary storage space is reduced, and no external memory is needed. The present invention can improve a phenomenon of slow speed and reduce the power loss because of using an external memory.

Description

The validity checking method of the adjacent macroblocks of digital multimedia broadcasting video decoder

(1) technical field

The invention relates to the technology of DMB (DMB) Video Decoder, especially about the invention of the validity checking method of efficiently examining the adjacent macroblocks whether macro block of decoding now and adjacent macroblocks are present in a kind of digital multimedia broadcasting video decoder in the same section.

(2) background technology

H.264 the specification of DMB (Digital Multimedia Broadcasting: DMB, hereinafter to be referred as DMB) Video Decoder (Video Decoder) is.

According to above-mentioned H.264 decoding algorithm, whether the validity of examining adjacent (top and the left side of the macro block of decoding now) macro block is need examine adjacent macroblocks to be included in the section (slice) with duplicate numbers.Like this, the reason of examining the validity of adjacent macroblocks is that the information of the macro block of decoding is included in the high efficiency information in the adjacent macroblocks now.

In above-mentioned H.264 specification (spec), there is not to propose to examine the method for section number (slice number), the method for Fig. 1 below in reference software (reference software), having proposed.

Fig. 1 is the schematic diagram of validity checking method of the adjacent macroblocks of prior art.

As shown in Figure 1, the basic comprising unit of a picture (picture) is a macro block 1, and above-mentioned a plurality of macro blocks 1 are assembled, and forms section 4, and a plurality of sections 4 constitute picture.

According to above-mentioned reference software (reference software), above-mentioned each macro block 1 has section 4 numbers, section 4 numbers and section 4 numbers of adjacent macroblocks 3 of the macro block 2 of decoding are now directly compared,, judge effective (TRUE) if the section number of two macro blocks is identical; If different, judge invalid (FALSE), check the validity of macro block.

That is, as shown in the figure, the macro block that is included in the same slice has identical section number, and the macro block that is included in the different sections has different section numbers.

Because this method requires the section number of all macro blocks of storage in memory, has the problem (not only should have above-mentioned section number, also should store the address of each macro block) that takies a large amount of memory spaces.

If use the above-mentioned section number of external memory stores, exist to cause DMB decoder speed to reduce, and, because external memory access (Access) causes the problem of a large amount of losses of electric power.

And if use internal storage, not only size is very big, but also has when the big internal memory accesses of size the problem of power consumption increase.

(3) summary of the invention

The objective of the invention is in order to address the above problem, provide a kind of and efficiently examine in the validation process of the needed adjacent macroblocks of DMB video decoding process, whether macro block of decoding now and adjacent macroblocks are present in the validity checking method of the adjacent macroblocks of the interior a kind of digital multimedia broadcasting video decoder of same slice.

To achieve these goals, the validity checking method of the adjacent left-hand macro block of DMB of the present invention (DMB) Video Decoder comprises following step, and as feature:, deduct the step that 1 numerical value and the inner address of macro block at first of the section under the above-mentioned macro block of now decoding compare on the address with above-mentioned macro block of now decoding in order just to check now validity at the adjacent left-hand macro block of decoded macroblock; When the comparative result of above-mentioned steps is when deducting 1 numerical value greater than the address of above-mentioned initial macro block, to judge above-mentioned macro block and the step of adjacent left-hand macro block in same section of now decoding.

In addition, the validity checking method of the adjacent upside macro block of DMB of the present invention (DMB) Video Decoder comprises following step: for the validity of the adjacent upside macro block of checking the macro block of decoding now, deduct the step that numerical value and the inner address of macro block at first of the section under the above-mentioned macro block of now decoding of the number of horizontal direction macro block compare from the address of the macro block of above-mentioned present decoding; When the numerical value of the number that deducts above-mentioned horizontal direction macro block is identical greater than the address value of above-mentioned initial macro block or the two, judge above-mentioned macro block and the step of adjacent upside macro block in same section of now decoding.

Effect of the present invention:

The validity checking method of the adjacent macroblocks of digital multimedia broadcasting video decoder of the present invention reaches following effect.

First, in order to confirm whether neighboring macro-blocks is included in the identical section, do not need each macro block all to have the section number, address (IniMBAddr) information that only need have the number (HMBNumber) of reveal competence direction number of macroblocks and the initial macro block of relevant section is just passable, reaches the effect of the unnecessary memory space that cuts the waste.

The second, use the validity checking method of the adjacent macroblocks of DMB Video Decoder of the present invention, do not need external memory storage, reach the slow phenomenon of improvement speed and reduce owing to use the effect of the power consumption that external memory storage causes.

For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.

(4) description of drawings

Fig. 1 is the schematic diagram of validity checking method of adjacent macroblocks of the DMB Video Decoder of prior art.

Fig. 2 is the schematic diagram of validity checking method of the adjacent macroblocks of DMB Video Decoder of the present invention.

The symbol description of major part in the accompanying drawing:

11: the initial macro block 12 of present section: macro block

13: the macro block 14 of present decoding: neighboring macro-blocks

20: section n

(5) embodiment

Embodiment to the validity checking method of the adjacent macroblocks of digital multimedia broadcasting video decoder of the present invention is elaborated below with reference to accompanying drawings.

As shown in Figure 2, a section 20 is made of a plurality of macro blocks 12, and above-mentioned section 20 is assembled, and constitutes a picture (picture).Above-mentioned macro block 12 has the address separately, and the feature of above-mentioned address is: from the left side to the right, increase gradually from top to bottom (numeral of accompanying drawing be for convenience of explanation and the number of regulation is irrelevant with the DMB specification).According to the present invention, for confirm above-mentioned each macro block 12 whether with adjacent macroblocks in identical section 20, there is no need each macro block and all have section 20 numbers.But the number (hereinafter to be referred as HMBNumber) of reveal competence (Horizontal) direction number of macroblocks should have the section number with the address (hereinafter to be referred as ' IniMBAddr ') of initial (Initial) macro block of relevant section.

Below with reference to Fig. 2 this content is elaborated.

In Fig. 2, representing the HMBNumber of horizontal direction macro block number is 14, the address of first macro block 11 of section n20, that is and, IniMBAddr is 22.

Whether and now the address of the macro block 13 of decoding is 24, and the address of adjacent macroblocks 14 is 23, if the section number is 10,, should operate according to the methods below in identical section in order to confirm adjacent upside macro block 14 and left side macro block 14.

Embodiment 1.

1) situation of adjacent left side macro block,

Address-1=24-1=23＞the IniMBAddr=22 of the macro block 13 of present decoding → be included in the same section.

Promptly, if from the address of the macro block 13 of present decoding, deduct 1, this is the address of adjacent left side macro block 14, because the macro block 13 that this value, can be judged above-mentioned present decoding greater than the address value of the initial macro block 11 of section n (20) is included in the same slice with adjacent left side macro block 14.

2) situation of adjacent upside macro block,

Address-HMBNumber=24-14=10＜the IniMBAddr=22 of the macro block 13 of present decoding → be present in the different mutually sections.

Because from the address of the macro block 13 of present decoding, deduct the address value of the numerical value of the HMBNumber that represents horizontal direction macro block number, so the macro block 13 of judging decoding now is present in the different sections with adjacent upside macro block 14 less than initial macro block 11.If above-mentioned two macro blocks (13,14) are in same section, the above-mentioned numerical value that deducts should be identical greater than the address value of initial macro block 11 or the two.

In order to confirm this situation, be 48 to be that example describes with the address of the macro block 13 of present decoding.

Embodiment 2.

1) situation of adjacent left side macro block,

Address-1=47＞the IniMBAddr=22 of the macro block 13 of present decoding → be included in the same section.

2) situation of adjacent upside macro block,

Address-HMBNumber=48-14=34＞the IniMBAddr=22 of the macro block 13 of present decoding → be included in the same section.

According to the situation of top embodiment 1 and embodiment 2 demonstrations, it is as follows to confirm earlier whether adjacent left side or upside macro block are included in the interior formula arrangement of same section.

1) situation of adjacent left side macro block,

If: the address-1＞=IniMBAddr of the macro block of present decoding, conclusion is effective (return TRUE); Otherwise be invalid (else return FALSE);

In order to confirm whether adjacent left side macro block is included in the same section, in the formula on top, the address of macro block of decoding is now deducted 1, if this numerical value is identical with the IniMBAddr value or greater than this value, representative is included in the same section, it is effective macro block, judges effectively (TRUE); If less than this value, representative is not included in the same section, and it is invalid macro block, judges invalid (FALSE).

2) situation of adjacent upside macro block,

If: the address-HMBNumber＞=IniBAddr of the macro block of present decoding, conclusion is effective (returnTRUE); Otherwise be invalid (else return FALSE);

In order to confirm whether adjacent upside macro block is included in the same section, in the formula on top, deduct the number of whole macro blocks of horizontal direction in the address of macro block with decoding now, when the above-mentioned numerical value that deducts identical with the address of the initial macro block of section or greater than the time, show that effective (TRUE) that represent the same slice meaning judges, if less than the time, show that invalid (FALSE) judges.

Judge whether adjacent macroblocks is included in the identical section, does not need each macro block all to have the section number, and the unnecessary memory space of avoiding waste can be decoded efficiently if use said method.

On the other hand, when above-mentioned HMBNumber and IniMBAddr two information are decoded to a section by constant value, can use the processor internal register,, also take memory space hardly even use under the situation of internal data random asccess memory (RAM).

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.

Claims

1. the validity checking method of the adjacent left-hand macro block of a digital multimedia broadcasting video decoder, be the inspection method of the validity of adjacent left-hand macro block that the picture that is made of a plurality of sections of assembling a plurality of macro blocks is decoded, it is characterized in that comprising following step:

For the validity of the adjacent left-hand macro block of checking the macro block of decoding now, deduct the step that 1 numerical value and the inner address of macro block at first of the section under the described macro block of now decoding compare on the address with described macro block of now decoding;

When the comparative result of above-mentioned steps is to deduct 1 numerical value when identical, to judge above-mentioned macro block and the step of adjacent left-hand macro block in same section of now decoding greater than the address of above-mentioned initial macro block or the two.

2. the validity checking method of the adjacent upside macro block of digital multimedia broadcasting video decoder, be the method for the validity of the adjacent upside macro block of inspection that the picture that is made of a plurality of sections of assembling a plurality of macro blocks is decoded, it is characterized in that comprising following step:

From the address of the macro block of present decoding, deduct the step that the address of the numerical value of number of horizontal direction macro block and the inner initial macro block of section under the described macro block of now decoding compares;

When the numerical value of the number that deducts described horizontal direction macro block greater than the address value of described initial macro block or when identical, judge described macro block and the step of adjacent upside macro block in same section of now decoding.