CN1747553A - Moving picture coding apparatus, moving picture coding method, and moving picture imaging apparatus - Google Patents
Moving picture coding apparatus, moving picture coding method, and moving picture imaging apparatus Download PDFInfo
- Publication number
- CN1747553A CN1747553A CN 200510102459 CN200510102459A CN1747553A CN 1747553 A CN1747553 A CN 1747553A CN 200510102459 CN200510102459 CN 200510102459 CN 200510102459 A CN200510102459 A CN 200510102459A CN 1747553 A CN1747553 A CN 1747553A
- Authority
- CN
- China
- Prior art keywords
- frame
- quantization step
- coding
- encoding
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 107
- 238000003384 imaging method Methods 0.000 title claims description 38
- 238000013139 quantization Methods 0.000 claims abstract description 245
- 238000012937 correction Methods 0.000 claims description 48
- 238000011002 quantification Methods 0.000 claims description 20
- 238000004513 sizing Methods 0.000 claims description 17
- 238000009825 accumulation Methods 0.000 claims description 11
- 230000001186 cumulative effect Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 8
- 230000001915 proofreading effect Effects 0.000 claims description 8
- 101100332288 Dictyostelium discoideum dst3 gene Proteins 0.000 description 43
- 101100366891 Dictyostelium discoideum dstC gene Proteins 0.000 description 43
- 230000007812 deficiency Effects 0.000 description 17
- 230000000694 effects Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 13
- 238000005259 measurement Methods 0.000 description 13
- 238000003860 storage Methods 0.000 description 10
- 238000013459 approach Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 6
- 230000005764 inhibitory process Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007850 degeneration Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000005039 memory span Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000003292 diminished effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Abstract
When a frame (n+1) is to be inter-coded after inter-coding a frame n (S142: INTER), a moving picture coding apparatus determines a quantizer scale Q[n+1] to be used in quantization of the frame (n+1), using a first method, based on an amount of generated codes Cn of the frame n (S143). When the frame (n+1) is to be inter-coded after intra-coding the frame n (S142: INTRA), the moving picture coding apparatus determines the quantizer scale Q[n+1] to be used in quantization of the frame (n+1), using a second method, based on the amount of generated codes Cn of the frame n (S143). The quantizer scale determined by using the second method takes a smaller value than that determined by using the first method.
Description
Technical field
The imaging device that the present invention relates to dynamic image encoding device, dynamic image encoding method and be used for the moving image of encoding moving pictures.The invention particularly relates to the technology of in quantizing motion image data, using that is used for determining quantization step.
Background technology
Usually, the moving image imaging device is equipped with the dynamic image encoding device that is used for the motion image data that the compression movement image forming device has.This dynamic image encoding device is by quantizing to come packed data.Quantification is a kind ofly to come method of compressing data by discrete typical value surrogate data method value.Interval between the typical value is limited by the parameter that is called quantization step.Along with the increase of quantization step, compression ratio also uprises (that is, the coding size diminishes) thereupon.
According to the embodiment of the conventional model of dynamic image encoding device, adopt fixed value as the different quantization steps (for example referring to ISO/IEC-14496-2) of quantization step with the frame (so-called P image or B image) that is identified for each interframe encode for the frame (so-called I image) of intraframe coding.Quantization step for each frame of being identified for interframe encode uses following formula 1.
Qp[n+1]=(Cn/dstC) * Qp[n] formula 1
In this formula, Qp[n] for being used for the quantization step that the n frame quantizes, Cn is the encoding amount that produces at the n frame, and dstC is the aim parameter for the predetermined coding that will produce of a frame.
According to formula 1, be used for the quantization step Qn[n+1 of n+1 frame] along with encoding amount Cn that produces at the n frame and target code amount dstC ratio become big and becomes big.Formula 1 is worked in the mode of the encoding amount that is suppressed at the n+1 frame and produces.By determining quantization step for each frame in the above described manner, described dynamic image encoding device makes the encoding amount of inter-frame encoding frame generation more approach the target code amount that produces.
Because the encoding amount that intracoded frame produces influences picture quality to a great extent, be defined as making the encoding amount that results from these frames greater than the target code amount usually for the quantization step of the frame that will carry out intraframe coding.In this case, above-mentioned dynamic image encoding device manages to be suppressed at the encoding amount that produces immediately following in inter-frame encoding frame (frame 1) frame 2 afterwards.Therefore, the encoding amount of frame 2 generations is less than the target code amount.Then, dynamic image encoding device makes the encoding amount that results from frame 3 greater than the target code amount.As mentioned above, by the dynamic image encoding device of routine, there is fluctuation (hunting) in the encoding amount that produces in several frames of following after intracoded frame.
Figure 1A and Figure 1B are depicted as encoding amount and the picture quality variation diagram that results from each frame in traditional dynamic image encoding device.
In this embodiment, frame 1,11 and 21 is an intracoded frame, and other frames are inter-frame encoding frame.Among the figure, closelying follow the fluctuation (Figure 1A) that to observe the encoding amount of aforesaid generation in four frames after intracoded frame.
Usually, along with the increase of the encoding amount that produces, picture quality improves gradually.Therefore, the fluctuation of the encoding amount of generation makes picture quality instability (Figure 1B).Therefore, this image becomes and is difficult to watch.
This problem is not limited to determine for each frame the model of quantization step, determines that at each piece line (being arranged in the line of the macro block of image array) also there is such problem in the model of quantization step.
Summary of the invention
Purpose of the present invention is for providing the imaging device that can be suppressed at immediately following with dynamic image encoding device, dynamic image encoding method and the moving image of the fluctuation of the encoding amount that produces in the several frames after intracoded frame.
Dynamic image encoding device according to the present invention comprises the coding unit that is used for each frame data of a plurality of frames of moving image are optionally carried out interframe encode or intraframe coding, and this intraframe coding and interframe encode all relate to quantification; Be used for being identified for quantization step that second frame data quantize order unit really according to the encoding amount that first frame produces, wherein when coding unit carries out interframe encode to the data of second frame, if the data of first frame have been carried out interframe encode, make decision by adopting (i) first method, if perhaps the data of first frame have been carried out intraframe coding and adopted (ii) second method to make decision, the value that obtains by the quantization step that adopts second method to determine is less than by adopting the value of the quantization step that first method determines.
According to said structure, when first frame is intraframe coding, adopt second method to determine the quantization step of second frame.Therefore, the quantization step of second frame is less than the situation of first method of employing.
In conventional art, the quantization step of second frame is adopted use the same method definite (that is, first method), and does not consider the type of the predictive coding carried out in first frame.
On the other hand, the quantization step of second frame becomes littler than the quantization step of conventional art in the present invention, and therefore can reduce the unexpected reduction of the encoding amount that produces in second frame.Therefore, can be suppressed at the fluctuation of the encoding amount that produces in several frames of following after intracoded frame.
Above-mentioned dynamic image encoding device also can be so that the second party method be provided with in the mode that falls into the scope of the definite quantization step 1/5 to 1/3 of first method of employing by the quantization step that adopts second method to determine.
Usually, if use same quantization step, the encoding amount that produces in the intracoded frame is three to five times of the encoding amounts that produce in the inter-frame encoding frame.According to said structure, the quantization step of second frame is much the same, no matter first frame is intraframe coding or interframe encode.Particularly, even when first frame is intraframe coding, when determining quantization step, to be that interframe encode is handled also as first frame.Usually, the part at the frame of interframe encode can often not fluctuate.Therefore, by using said structure, can suppress the fluctuation of the encoding amount of second frame multiframe generation afterwards.
Above-mentioned dynamic image encoding device may further include be used for (i) result from first frame and prior to the accumulation encoding amount of each frame of first frame and (ii) first frame and prior to each frame of first frame in obtain difference between the cumulative target amount of predictive encoding difference obtain the unit, wherein first method and second method become big with the quantization step determined along with the difference of the encoding amount that produces and mode that increase is provided with.
According to said structure, the encoding amount and the difference between the cumulative target encoding amount that produce along with accumulation become big, and it is big that the quantization step of second frame also becomes.Particularly, it is worked to suppress to result from the encoding amount of second frame.Therefore, the encoding amount of accumulation generation changes suitable with the cumulative target encoding amount of making peace greatly.Therefore, can make the encoding amount of generation approach target code amount for whole moving image.
Above-mentioned dynamic image encoding device also can be for the encoding amount that produces in accumulation during less than the cumulative target encoding amount, and is big and become big mode first and second methods are set along with the change that produces encoding amount with quantization step, and do not consider difference.
In moving image, when the correlation between the frame was very high, the encoding amount that produces in each frame reduced with respect to the target code amount.Yet according to said structure, even in this case, the encoding amount of generation can not improve yet, and can have unnecessary free space in memory span.At this moment, even also can avoid overflowing of memory span when the correlation between each frame descends suddenly.
Dynamic image encoding device may further include the buffer of the coded data that is used for storing moving image, wherein when this buffer has pre-sizing or bigger free space (free space), this first and second method is provided with along with the change that produces encoding amount becomes big mode greatly with quantization step, and does not consider the difference amount.
According to said structure, when free space is a preliminary dimension or when bigger, this device work is to suppress to result from the encoding amount of second frame.Therefore, can avoid overflowing of buffer.
This above-mentioned dynamic image encoding device also can be for when coding unit will carry out intraframe coding to the data of second frame, and it is quantization step that determining unit is set fixed value.
According to above-mentioned structure, when carrying out intraframe coding, frame needn't all determine quantization step at every turn.Therefore, can dwindle the circuit size of dynamic image encoding device.
Above-mentioned dynamic image encoding device also can be for when coding unit will carry out intraframe coding to second frame data after the data of coding first frame, determining unit is determined quantization step by adopting third party's method, and the value that the quantization step of determining by employing third party method obtains is greater than the value of determining by first method.
According to said structure, the quantization step of second frame adopts third party's method to determine.By adopting this method and using the quantization step of situation comparison second frame of first method to become big.Therefore, the encoding amount ratio that results from second frame diminishes when first method of employing, and can avoid becoming excessive at the encoding amount that second frame produces.
Above-mentioned dynamic image encoding device may further include the buffer of the coded data that is used for storing moving image, wherein when coding unit carries out intraframe coding to the data of second frame after coding first frame data, determining unit (i) is if buffer has pre-sizing or bigger free space, the setting quantization step is a fixed value, if and the free space of (ii) buffer existence is less than pre-sizing, by adopting third party's method to determine quantization step, the value that the quantization step of determining by employing third party method obtains is greater than the value of determining by first method.
According to said structure, can adjust the encoding amount that intracoded frame produces according to the size of buffer free space.Therefore, can avoid overflowing of buffer.
Above-mentioned dynamic image encoding device can be for when coding unit carries out intraframe coding to second frame data behind coding first frame data, determining unit is determined the quantization step of second frame based on being used for the quantization step that first frame quantizes, and does not consider the encoding amount that produces.
According to said structure, do not consider that the encoding amount that produces determines quantization step in first frame.Therefore and according to the encoding amount that produces determine that the situation of quantization step compares, and can reduce the treating capacity (processing load) of dynamic image encoding device.
Above-mentioned dynamic image encoding device also can be for when coding unit carries out intraframe coding to second frame data after coding first frame data, and determining unit is by being multiply by the quantization step that the quantization step that is used for first frame is identified for second frame by predetermined value.
According to said structure, be identified for the quantization step of second frame based on the quantization step of first frame.
Above-mentioned dynamic image encoding device also can for: predetermined value is in 5/4 to 4/3 scope.
According to said structure, along with predetermined value becomes big, the inhibition effect of the encoding amount that produces for intracoded frame improves, but the picture quality variation.Simulation result shows by predetermined value being set in 5/4 to 4/3 the scope inhibition effect that can not only can obtain the encoding amount that intracoded frame produces but also can obtaining fabulous picture quality.
Above-mentioned dynamic image encoding device may further include record cell, be used for record sheet and be shown in the quantization step of first frame and the table of the corresponding relation between the second frame quantization step, wherein determining unit is identified for the quantization step of second frame based on the quantization step that is used for first frame with reference to this table.
According to said structure, can be identified for the quantization step of second frame based on the quantization step that is used for first frame.
Above-mentioned dynamic image encoding device also can for: determining unit is identified for the quantization step of second frame based on each quantization step of the preceding frame that is used in predetermined quantity except that the quantization step that is used for first frame in addition.
By the quantization step of determining based on a more than frame,, can improve the effect that suppresses fluctuation though improved the treating capacity of dynamic image encoding device.
In addition, dynamic image encoding device according to the present invention comprises: be used for each data of a plurality of lines of moving image are optionally carried out the coding unit of interframe encode or intraframe coding, interframe encode and intraframe coding all relate to quantification; Correcting unit, being used for (i) adopts the encoding amount that produces in one or more inter-coded block lines of first method to the encoding block line of predetermined quantity to proofread and correct, and (ii) adopting second method that the encoding amount that the one or more Intra-coded blocks lines in the encoding block line of scheduled volume produce is proofreaied and correct, the value that the encoding amount that produces by the one or more inter-coded block lines after adopting second method to proofread and correct obtains is less than the value after proofreading and correct by first method; And determining unit, when coding unit is wanted the data of next piece line of interframe encode, be used for the definite quantization step that will be used for next piece line data-measuring of coding total amount based on Intra-coded blocks line of having proofreaied and correct and the generation of inter-coded block line.
According to said structure with do not consider that the situation of the encoding amount that coding method proofread and correct to produce compares, the quantization step of next the piece line that is used for encoding can be littler.Therefore the encoding amount that produces in the piece line when encoding is not easy to reduce.Therefore, can be suppressed at the fluctuation of closelying follow the encoding amount that produces in the several lines after Intra-coded blocks.
Above-mentioned dynamic image encoding device also can for: set second method in the mode that falls into by the encoding amount that adopts second method in one or more inter-coded block lines, to produce in 1/5 to 1/3 the scope that adopts encoding amount that first method proofreaies and correct.
Usually, if use same quantization step, the encoding amount that the Intra-coded blocks line produces is greater than three to five times of the encoding amount that produces in the inter-coded block line.According to said structure,, when determining second line quantization step, to be that interframe encode is handled also as first frame even when first line is intraframe coding.Usually, the part at the inter-coded block line can often not fluctuate.Therefore, by using said structure, can be suppressed at the fluctuation of the encoding amount of second line polylith line generation afterwards.
Moving image imaging device according to the present invention comprises and is used to gather target image to produce the image device of moving image; Be used for coding unit that each data of the multiframe of moving image are optionally carried out interframe encode or intraframe coding, interframe encode and intraframe coding all relate to quantification; Be used for being identified for quantization step that second frame data quantize order unit really according to the encoding amount that results from first frame, wherein when coding unit carries out interframe encode to the data of second frame, (i) if the interframe encode of the data by first frame, adopt first method to make decision, if perhaps (ii) the intraframe coding of the data of first frame adopts second method to make decision, the value that obtains by the quantization step that adopts second method to determine is less than the quantization step by adopting first method to determine.
In addition, the moving image imaging device comprises according to the present invention: image device is used to gather target image to produce moving image; Coding unit is used for each data of a plurality of lines of moving image are optionally carried out interframe encode or intraframe coding, and wherein interframe encode and intraframe coding all relate to quantification; Correcting unit, be used for (i) and adopt the encoding amount of first method correction in one or more inter-coded block lines generations of the encoding block line of predetermined quantity, and (ii) adopting second method to proofread and correct the encoding amount that the one or more Intra-coded blocks lines in the encoding block line of predetermined quantity produce, the value that obtains by the encoding amount that results from one or more inter-coded block lines that adopts second method to proofread and correct is less than the encoding amount of proofreading and correct by first method; And determining unit is long, when coding unit is wanted the data of next piece line of interframe encode, is used for being identified for based on the coding total amount of Intra-coded blocks line of having proofreaied and correct and the generation of inter-coded block line the quantization step of next piece line data-measuring.
According to said structure, can obtain the effect the same with above-mentioned dynamic image encoding device.
Dynamic image encoding method according to the present invention comprises: coding step, optionally each data in the multiframe of moving image are carried out interframe encode or intraframe coding, and wherein interframe encode and intraframe coding all relate to quantification; Determining step, determine the quantization step that second frame data quantize according to the encoding amount that results from first frame, wherein when the data of second frame are carried out interframe encode, by (i) if the data of first frame interframe encode, adopt first method to make decision, if perhaps (ii) the intraframe coding of the data of first frame adopts second method to make decision, wherein, the value that obtains by the quantization step that adopts second method to determine is less than the quantization step by adopting first method to determine.
In addition, dynamic image encoding method according to the present invention comprises: coding step, optionally each data of polylith line in the moving image are carried out interframe encode or intraframe coding, and wherein interframe encode and intraframe coding all relate to quantification; Aligning step, (i) adopt first method to proofread and correct the encoding amount that the one or more inter-coded block lines in the encoding block line of predetermined quantity produce, and (ii) adopt second method to proofread and correct the encoding amount of the one or more Intra-coded blocks lines in the encoding block line of predetermined quantity, wherein, the value that obtains of the encoding amount that produces by the one or more inter-coded block lines that adopt second method to proofread and correct is less than the encoding amount of proofreading and correct by first method; And determining step, when the data of next piece line of interframe encode, be used for the definite quantization step that will be used for next piece line data-measuring of coding total amount based on Intra-coded blocks line of having proofreaied and correct and the generation of inter-coded block line.
According to said structure, can obtain the effect the same with above-mentioned dynamic image encoding device.
Description of drawings
By the following description and in conjunction with the accompanying drawing of the specific embodiment of the present invention, will make these and other objects of the present invention, advantage and feature become more obvious.
In the accompanying drawing:
Figure 1A and Figure 1B are depicted as the schematic diagram of the variation of the encoding amount that results from each frame in the conventional motion picture coding device and picture quality;
Figure 2 shows that structure according to the moving image imaging device of first execution mode;
Figure 3 shows that the embodiment of coding correcting unit 12 detailed structure;
Figure 4 shows that schematic diagram according to the operation of the first execution mode dynamic image encoding device 31;
Figure 5 shows that the detailed maps of determining the operation of quantization step according to first execution mode;
Fig. 6 A is depicted as the schematic diagram that the coding total amount of the quantization step according to first execution mode, the encoding amount that results from each frame, picture quality and generation changes in chronological order to Fig. 6 D;
Figure 7 shows that the detailed maps of determining the quantization step operation according to second execution mode;
Fig. 8 A is depicted as the schematic diagram that the coding total amount according to the second execution mode quantization step, the encoding amount that results from each frame, picture quality and generation changes in chronological order to Fig. 8 D;
Figure 9 shows that structure according to the moving image imaging device of the 3rd execution mode;
Figure 10 shows that the embodiment of the detailed structure of difference computational unit 14 and target code correcting unit 15;
Figure 11 shows that operation according to the dynamic image encoding device 33 of the 3rd execution mode;
Figure 12 shows that detail operations according to the correction target encoding amount of the 3rd execution mode;
Figure 13 A is depicted as the schematic diagram that the coding total amount according to the 3rd execution mode quantization step, the encoding amount that results from each frame, picture quality and generation changes in chronological order to Figure 13 D;
Figure 14 shows that structure according to the moving image imaging device of the 4th execution mode;
Figure 15 shows that the detailed maps of determining the quantization step operation according to the 4th execution mode;
Figure 16 shows that structure according to the moving image imaging device of the 5th execution mode;
Figure 17 shows that operation according to the dynamic image encoding device 35 of the 5th execution mode;
Figure 18 shows that the detailed maps of determining the quantization step operation according to the 6th execution mode;
Figure 19 A is depicted as the schematic diagram that changes in chronological order according to the 6th execution mode quantization step, the encoding amount that results from each frame and picture quality to Figure 19 C;
Figure 20 shows that structure according to the moving image imaging device of the 7th execution mode;
Shown in Figure 21 for being stored in the embodiment of the table of showing memory cell 19;
Shown in Figure 22 for determine the detailed maps of quantization step operation according to the 7th execution mode;
Shown in Figure 23 is structure according to the moving image imaging device of the 8th execution mode;
Shown in Figure 24 is the embodiment of the detailed structure of coding correcting unit 12;
Shown in Figure 25 is operation according to the dynamic image encoding device 38 of the 8th execution mode;
Shown in Figure 26 for determine the detailed maps of quantization step operation according to the 8th execution mode;
Schematic diagram for changing in chronological order shown in Figure 27 according to the 8th execution mode encoding amount; And
Shown in Figure 28 is structure according to the moving image imaging device of the 9th execution mode.
Embodiment
Below with reference to description of drawings preferred implementation of the present invention.
First execution mode
Figure 2 shows that structure according to the moving image imaging device of first execution mode.
The moving image imaging device is provided with imaging lens 1, imaging sensor 2, dynamic image encoding device 31, microcomputer 4, program storage 5 and video flowing memory 6.Imaging lens 1 produces target image on imaging sensor 2.This imaging sensor 2 is gathered target image to produce motion image data.Dynamic image encoding device 31 is by the digital coding generation video flowing of compression by the moving image of imaging sensor 2 generations.Microcomputer 4 is according to the program controlled motion image device generally that is stored in the program storage 5.The video flowing that 6 storages of video flowing memory produce by dynamic image encoding device 31.
Dynamic image encoding device 31 comprises coding unit 11, coding correcting unit 12 and quantization step determining unit 13.
The quantization step that is used for the frame quantification is provided by quantization step determining unit 13.
When frame n is intraframe coding:
Cn '=Cn*P1 formula 2
When frame n is interframe encode:
Cn '=Cn*P2 formula 3
In above-mentioned formula, Cn is the encoding amount that produces to frame n coding back, and P1 and P2 are the correction coefficient of P1＜P2 for closing.In the first embodiment, adopt P1=P, wherein the situation of (0＜P＜1) and P2=1 is as embodiment.This correction coefficient P satisfies following formula 4.
P=Cinter/Cintra formula 4
In this formula, the encoding amount that Cinter produces when adopting the quantization step of appointment to carry out interframe encode for the frame in appointment, and the encoding amount of Cintra for when the same same quantization step of frame employing carries out intraframe coding, producing.This correction coefficient P is used for the encoding amount that intraframe coding produces is converted to the encoding amount that interframe encode produces.
Generally speaking, the encoding amount that produces by intraframe coding of a certain frame approximately is that same frame is produced three to five times of encoding amount by interframe encode.Therefore, the correction coefficient P in first execution mode is set to fall into the fixed value in 1/5 to 1/3 scope.Notice that this coding correcting unit 12 is intraframe coding or interframe encode according to specifying this frame from the instruction of microcomputer 4.
Quantization step determining unit 13 is identified for the frame (quantization step of (n+1) according to following formula 5 and formula 6.
When frame (n+1) will carry out intraframe coding:
Qp[n+1]=Qpintra formula 5
When frame (n+1) will carry out interframe encode:
Qp[n+1]=(Cn '/dstC) * Qp[n] formula 6
In above-mentioned formula 5 and 6, Qpintra is a predetermined value, and dstC is the target code amount of setting in advance.
In the first embodiment, Qpintra is used as quantization step when frame (n+1) carries out intraframe coding.When frame (n+1) carries out interframe encode, based on Cn ' and quantization step Qp[n] determine quantization step, wherein Cn ' is the encoding amount after proofreading and correct by coding correcting unit 12.
The encoding amount that coding correcting unit 12 produces according to formula 2 frame n when frame n carries out intraframe coding, and the encoding amount that when frame n carries out interframe encode, produces according to formula 3 correct frames n.Below explanation is used to realize the embodiment of the structure of above-mentioned situation.
Figure 3 shows that the embodiment of the detailed structure of coding correcting unit 12.
The encoding amount that frame n produces by coding unit 11 codings is measured in encoding measurement unit 121.Register R1 keeps correction coefficient P, and register R2 keeps correction coefficient 1.According to the instruction from microcomputer 4, selector S1 imposes on multiplier M1 with correction coefficient P when frame n carries out intraframe coding, and when frame n carries out interframe encode just correction coefficient 1 impose on multiplier M1.
This multiplier M1 multiplies each other the encoding amount Cn of generation and the correction coefficient of selection.122 storages of this frame coded stack are by the result of multiplier M1 product, and give quantization step determining unit 13 with this result.
By above-mentioned structure, encoding amount Cn '=Cn*P that this coding correcting unit 12 can output calibration when frame n carries out intraframe coding, and as frame n coding correcting unit 12 output calibration encoding amount Cn '=Cn during for interframe encode.
Figure 4 shows that operation chart according to the first execution mode dynamic image encoding device 31.
Dynamic image encoding device 31 starts coding in response to the instruction from microcomputer 4.At first, 31 pairs of frame 1 intraframe codings of dynamic image encoding device (step S11).Because frame 1 does not have preceding frame, so frame 1 intraframe coding always.As the initial value of quantization step, use the Qpintra that will use when encoding in the conducting frame.So, dynamic image encoding device 31 encoding amount (step S12) that storage frame 1 produces in frame coded stack 122.Because frame 1 is intraframe coding, C1*P is stored in the frame coded stack 122.
Next, dynamic image encoding device 31 is identified for the quantization step (step S14) of frame 2 based on encoding amount that produces and the quantization step that is used for frame 1.Then, this dynamic image encoding device 31 adopts the quantization step inter-frame encoding frame of determining 2 (step S15).
Dynamic image encoding device 31 is stored the encoding amount (step S16) that results from frame 2 in frame coded stack 122.Because frame 2 is an interframe encode, C2 is stored in the frame coded stack 122.After this, dynamic image encoding device 31 repeats operation from step S13 to step S17 up to microcomputer 4 indication stopping imaging.
Figure 5 shows that the operation detailed maps of determining quantization step according to first execution mode.
When microcomputer 4 indication inter-frame encoding frame (n+1) (step S141: interframe) and frame n carried out interframe encode (step S142: in the time of interframe), dynamic image encoding device 31 is identified for the quantization step Qp[n+1 of quantized frame (n+1)] for (Cn '/dstC) * Qp[n] (step S143).When frame n intraframe coding (step S142: in the frame), dynamic image encoding device 31 is identified for the quantization step Qp[n+1 of quantized frame (n+1)] be (Cn*P/dstC) * Qp[n] (step S144).
On the other hand, when microcomputer 4 indication intracoded frames (n+1) (step S141: in the frame), dynamic image encoding device 31 is identified for the quantization step Qp[n+1 of quantized frame (n+1)] be Qpintra (step S145).
[effect]
Fig. 6 A is depicted as the schematic diagram that the coding total amount according to the first execution mode quantization step, the encoding amount that results from each frame, picture quality and generation changes in chronological order to Fig. 6 D.
Fig. 6 A represents quantization step.In the first embodiment, the quantization step that is used for intracoded frame is set at fixed value Qpintra (referring to the step S145 of Fig. 5).Therefore, as shown in Figure 6A, the quantization step that is used for frame 1,11 and 21 adopts same value.Usually, set this fixed value and make the encoding amount that produces in the intracoded frame target code amount greater than a frame.This is because the encoding amount that produces in the intracoded frame influences the picture quality of whole moving image to a great extent, and the encoding amount that produces in the intracoded frame can cause whole degeneration of picture quality of moving image.
Fig. 6 B presentation code amount.The encoding amount C1 that produces is much larger than the target code amount.With produce the overlapping correction coding amount C1*P that illustrates of encoding amount and represent the encoding amount proofreaied and correct by coding correcting unit 12.This correction coding amount C1*P is converted to the encoding amount that is produced by interframe encode, and and has much the same size such as the encoding amount that the inter-frame encoding frame of frame 2 produces.Therefore, compare with the situation that the encoding amount that produces at frame 1 does not have to proofread and correct, the quantization step of frame 2 diminishes.Therefore and the situation of the quantization step of determining based on the encoding amount that not have of producing of frame 1 proofreaied and correct that is used for frame relatively, the encoding amount of frame 2 generations becomes bigger, and the encoding amount that the results from frame 2 frame target code amount of making peace greatly is the same.Because it is flux matched to result from make peace the greatly target code of a frame of the encoding amount of frame 2, the encoding amount that results from frame 3 to 10 also changes around the target code amount.Can be suppressed at the fluctuation of the encoding amount that produces immediately following the several inter-frame encoding frame after intracoded frame in the above described manner.
Fig. 6 C presentation video quality.Because can be suppressed at fluctuation in above-mentioned mode, so picture quality becomes stable immediately following the encoding amount of the generations of the several inter-frame encoding frame in intracoded frame after.
Fig. 6 D represents total encoding amount.In the first embodiment, the quantization step that is used for intracoded frame is fixed value Qpintra.Set encoding amount that this fixed value Qpintra makes that intracoded frame produces greater than the target code amount.Therefore, total encoding amount is greater than the cumulative target encoding amount.
Second execution mode
In the first embodiment, the fixed value Qpintra quantization step that acts on intracoded frame.Yet, in second execution mode, equally suitably determine the quantization step of intracoded frame.
[structure]
The same basically according to the dynamic image encoding device of second execution mode with dynamic image encoding device structure according to first execution mode.Therefore, also provide explanation with reference to figure 2.
When frame (n+1) will carry out interframe encode, and frame n is when having carried out intraframe coding:
Cn '=Cn*P1 formula 7
When frame (n+1) will carry out interframe encode, and frame n is when having carried out interframe encode:
Cn '=Cn*P2 formula 8
When frame (n+1) will carry out intraframe coding:
Cn '=Cn*P3 formula 9
P1, P2 and P3 are the correction coefficient of P1＜P2＜P3 for closing.In second execution mode, with P1=P, wherein (0＜P＜1), P2=1 and P3=1/P situation describe for embodiment.This correction coefficient P satisfies the coefficient of formula 4.
Quantization step determining unit 13 is identified for the quantization step of frame (n+1) according to following formula 10.
Qp[n+1]=(Cn '/dstC) * Qp[n] formula 10
[operation]
Figure 7 shows that the detailed maps of determining the quantization step operation according to second execution mode.
When microcomputer 4 indication inter-frame encoding frame (n+1) (step S241: interframe) and frame n carried out interframe encode (step S242: in the time of interframe), dynamic image encoding device 31 is identified for the quantization step Qp[n+1 of quantized frame (n+1)] be (Cn/dstC) * Qp[n] (step S243).On the other hand, when frame n has carried out intraframe coding (step S242: in the frame), dynamic image encoding device 31 is identified for the quantization step QP[n+1 of quantized frame (n+1)] be (Cn*P/dstC) * Qp[n] (step S244).
And, when microcomputer 4 indications are adopted intraframe coding for the predictive coding of frame (n+1) (step S241: in the frame), dynamic image encoding device 31 is identified for the quantization step Qp[n+1 of quantized frame (n+1)] be (Cn/ (dstC*P)) * Qp[n] (step S145).
[effect]
Fig. 8 A is depicted as the schematic diagram that changes in chronological order according to the second execution mode quantization step, the encoding amount that results from each frame, picture quality and generation coding total amount to Fig. 8 D.
Fig. 8 A represents quantization step.In second execution mode, suitably be identified for the quantization step (referring to the step S245 among Fig. 7) of intracoded frame.Therefore, shown in Fig. 8 A, the quantization step that is used for frame 1,11 and 21 does not adopt same value.For example, the encoding amount that produces based on preceding frame 10 is identified for the quantization step of frame 11.Because frame 1 does not have preceding frame, therefore specify the initial value of fixed value as frame 1 quantization step.
Fig. 8 B presentation code amount.Frame 1 is the same with first execution mode to the encoding amount that frame 10 produces.The encoding amount of each frame was the same substantially with the target code amount after the intraframe coding that frame 11 produces reached.
Fig. 8 C presentation video quality.Because suppressed the fluctuation of the encoding amount of generation, so picture quality becomes stable.But, because the encoding amount that intracoded frame (frame 11 and 21) produces is all very little, so the whole degeneration of picture quality.
Fig. 8 D represents total encoding amount.In second execution mode, the quantization step that suitably is identified for intracoded frame makes that the encoding amount and the target code amount of intracoded frame generation are suitable substantially.Therefore, total encoding amount approaches the cumulative target encoding amount.
The 3rd execution mode
In the first embodiment, the encoding amount that produces in the intracoded frame is set at greater than the target code amount.Therefore, the coding total amount is greater than the cumulative target total amount of encoding.
In the 3rd execution mode, below the basic suitable while with the cumulative target encoding amount of a kind of total amount of encoding of explanation can be suppressed the technology of picture quality variation as far as possible.
[structure]
Figure 9 shows that structure according to the moving image imaging device of the 3rd execution mode.
Structure according to the dynamic image encoding device 33 of the 3rd execution mode is the same with target code correcting unit 15 dynamic image encoding devices 31 basic and according to first execution mode except additional difference computational unit 14.Except difference computational unit 14 and target code correcting unit 15, element the same in the dynamic image encoding device 31 includes in the dynamic image encoding device of the 3rd execution mode.Therefore, do not explain for same element here.
When coded frame (n+1), difference computational unit 14 is calculated the accumulated deficiency IntC that the target code amount that deducts each frame generation before frame n and the frame n the total encoding amount that produces by each frame from frame n and frame n before draws.
IntC=∑ (Cn-dstC) formula 11
When accumulated deficiency greater than 0 the time, when accumulated deficiency is big more, target code correcting unit 15 is proofreaied and correct the target code amount littler.When accumulation difference is 0 or more hour, this target code correcting unit 15 is the correction target encoding amount not.Particularly, carry out correct operation according to following formula 12 and 13.
At IntC greater than 0 o'clock:
DstC '=dstC-IntC/d formula 12
Be less than or equal at 0 o'clock at IntC:
DstC '=dstC formula 13
In this formula, d is the adjustment parameter that is predefined for greater than 1.
Quantization step determining unit 13 is identified for the quantization step that frame (n+1) quantizes according to following formula 14 and 15.
When frame (n+1) will carry out intraframe coding:
Qp[n+1]=Qpintra formula 14
When frame (n+1) will carry out interframe encode:
Qp[n+1]=(Cn '/dstC ') * Qp[n] formula 15
Note coding correcting unit 12 with the one sample loading mode work of first execution mode, and will proofread and correct encoding amount Cn ' and pass to quantization step determining unit 13.
Below explanation is used to realize the embodiment of above-mentioned difference computational unit 14 and target code correcting unit 15 difference computation structures.
Figure 10 shows that the embodiment of the detailed structure of difference computational unit 14 and target code correcting unit 15.
This difference computational unit 14 comprises encoding measurement unit 141, register R1 and R2 and adder A1 and A2.
The encoding amount of the generation after frame n encodes by coding unit 11 is measured in encoding measurement unit 141.Register R1 keeps target code amount dstC, and register R2 keeps frame n and the frame n accumulated deficiency of each frame in the past.
At adder A1, from the encoding amount Cn that produces, deduct target code amount dstC.At adder A2, (Cn-dstC) that export from adder A1 adds the accumulated deficiency that remains on the register R2.This accumulated deficiency IntC from adder A2 output is saved in the register R2 then, and exports to target code correcting unit 15.
Target code correcting unit 15 comprises determining unit 151, register R3, R4 and R5, selector S1 and adder A3.
Whether determining unit 151 determines accumulated deficiency 151 greater than 0, exports the result to the control end of selector S1 then.
According to the judged result of determining unit 151, greater than 0 o'clock, selector S1 transmitted this accumulated deficiency IntC to multiplier M1 at IntC, and was less than or equal at 0 o'clock and will remains on 0 of register R4 at IntC and pass to multiplier M1.
This multiplier M1 multiplies each other accumulated deficiency IntC and the parameter 1/d that is used to regulate.Deduct result of product among the target code amount dstC of this adder A3 from remain on register R5, this subduction of dyad step-length determining unit 13 outputs result.
By said structure, greater than 0 o'clock, target code correcting unit 15 can realize along with accumulated deficiency increases the operation of proofreading and correct the target code amount littler at accumulated deficiency, and when accumulated deficiency is equal to or less than 0 correction target encoding amount not.
[operation]
Figure 11 shows that operation according to the dynamic image encoding device 33 of the 3rd execution mode.
Dynamic image encoding device 33 starts coding in response to the instruction from microcomputer 4.At first, 33 pairs of frames of dynamic image encoding device 1 carry out intraframe coding (step S31).Because frame 1 does not have preceding frame, so frame 1 always carries out intraframe coding.In the 3rd execution mode, to use the initial value of Qpintra when encoding in the conducting frame as quantization step.So, this dynamic image encoding device 33 encoding amount (step S32) that storage frame 1 produces in frame coded stack 122.Because frame 1 is intraframe coding, C1*P is stored in the frame coded stack 122.
Next, dynamic image encoding device 33 correction target encoding amounts (step S34), and the encoding amount, the quantization step that is used for frame 1 that produce based on frame 1 and proofread and correct after the target code amount be identified for the quantization step (step S35) of frame 2.Then, this dynamic image encoding device 33 adopts the quantization step of determining that frame 2 is carried out interframe encode (step S36).
This dynamic image encoding device 33 encoding amount (step S37) that storage frame 2 produces in frame coded stack 122.Because frame 2 is an interframe encode, C2 is stored in the frame coded stack 122.After this, this dynamic image encoding device 33 repeats operation from step S33 to step S38 up to microcomputer 4 indication stopping imaging.
Figure 12 shows that detail operations according to the correction target encoding amount of the 3rd execution mode.
Difference computational unit 14 is calculated accumulated deficiency IntC (step S341).
Greater than 0 o'clock (step S342: be), target code correcting unit 15 was proofreaied and correct the target code amount and is dstC-IntC/d at accumulated deficiency IntC.(step S342: not), target code correcting unit 15 is correction target encoding amount and keep dstC (step S344) not when accumulation difference when being less than or equal to 0.
The operation of determining quantization step is the same basically with first execution mode, and does not therefore describe in detail here.
[effect]
Figure 13 A is depicted as the schematic diagram that changes in chronological order according to the 3rd execution mode quantization step, the encoding amount that results from each frame, picture quality and generation coding total amount to Figure 13 D.
Figure 13 A represents quantization step.In the 3rd execution mode, the quantization step that is used for intracoded frame is set at fixed value Qpintra.
Figure 13 B presentation code amount.The encoding amount C1 correction that frame 1 is produced is correction coding amount C1*P.It is correction coding amount dstC ' that target code amount dstC is proofreaied and correct.Target code amount dstC ' after the correction becomes and is no more than an encoding amount for a short time than target code amount dstC, and this encoding amount exceeds the encoding amount of target code amount dstC for the encoding amount C1 that produces.
The encoding amount C2 that frame 2 produces is roughly suitable with the target code amount dstC ' after the correction.
The encoding amount C3 that results from frame 3 more approaches the target code amount than the encoding amount C2 that results from frame 2.This is because at the accumulation difference IntC at the frame 3 places accumulation difference IntC less than frame 2 places, and therefore the target code amount after frame 3 is proofreaied and correct more approaches target code amount dstC than frame 2.
And, in the 3rd execution mode,,, can realize level and smooth change although the encoding amount of a frame can sharply increase owing to adopt accumulated deficiency.This also is applied to not to be a plurality of frames of arriving immediately after the frame of intraframe coding.For example, the encoding amount that frame 26 produces sharply increases, and is level and smooth in the variation of frame 27 and 28 encoding amounts that produce subsequently still.
Figure 13 C presentation video quality.Because can be suppressed at the fluctuation of the encoding amount that produces immediately following the several inter-frame encoding frame after intracoded frame, so picture quality becomes stable.In addition, because it is the same with the situation of first execution mode to result from the encoding amount of inter-frame encoding frame, so the overview image quality can equally not degenerated to second execution mode.
Figure 13 D represents total encoding amount.In the 3rd execution mode, greater than 0 o'clock, proofread and correct this target code amount its change along with accumulated deficiency is diminished greatly at accumulated deficiency IntC.Therefore, even because the encoding amount that intracoded frame produces exceeds the target code amount, but the encoding amount that produces in the several frames after the intracoded frame becomes littler than target code amount, and the total amount of therefore encoding more approaches the cumulative target encoding amount.
The 4th execution mode
In the 4th execution mode, according to the remaining space size of buffer by being set at fixed value at quantization step first pattern and two patterns of second pattern of suitably determining quantization step between switch the quantization step of determining intracoded frame.
[structure]
Figure 14 shows that structure according to the moving image imaging device of the 4th execution mode.
Dynamic image encoding device 34 according to the 4th execution mode has the structure of having added space measurement unit 16, buffer 17 and transmission unit 18 in the dynamic image encoding device 31 according to first execution mode.Except space measurement unit 16, buffer 17 and transmission unit 18, dynamic image encoding device 34 has and dynamic image encoding device 31 basic the same structures according to first execution mode, and does not therefore explain here.
The size of buffer 17 remaining spaces is measured in space measurement unit 16, and notifies quantization step determining unit 13 with measurement result.
The buffer 17 temporary video flowings that produce by coding unit 11.The video flowing that transmission unit 18 will be stored in the buffer 17 is transferred in the video flowing memory 6.
Quantization step determining unit 13 is determined the quantization step that frame (n+1) quantizes according to following formula 16 and 17.
The free space that will carry out intraframe coding and buffer 17 when frame (n+1) is during greater than pre-sizing (for example, 20% of buffer):
Qp[n+1)=Qpintra formula 16
When the free space that will carry out intraframe coding and buffer 17 when frame (n+1) is less than or equal to pre-sizing or when frame (n+1) will carry out interframe encode:
Qp[n+1]=(Cn '/dstC ') * Qp[n] formula 17
In above-mentioned formula, Cn ' and formula 7,8 are the same with 9 Cn '.
Above-mentioned explanation is when the free space of buffer 17 during greater than pre-sizing, with the same first pattern executable operations of operating with first execution mode, and when the free space of buffer 17 is less than or equal to pre-sizing, with the same second mode of operation executable operations with second execution mode.
[operation]
Figure 15 shows that the detailed maps of determining the quantization step operation according to the 4th execution mode.
And, (step S441: in the frame) and free space are less than or equal to pre-sizing (step S445: deny) when microcomputer 4 indications are carried out intraframe coding to frame (n+1), and this dynamic image encoding device 34 is identified for the quantization step Qp[n+1 that frame (n+1) quantizes] be (Cn/ (dstC*P)) * Qp[n] (step S446).If free space is greater than pre-sizing (step S445: be), this dynamic image encoding device 34 is identified for the quantization step Qp[n+1 that frame (n+1) quantizes so] be Qpintra (step S447).
[effect]
When the quantization step that is used for the intracoded frame quantification adopts fixed value,, buffer also cannot adjust the encoding amount that intracoded frame produces although almost overflowing.Yet, can suppress the encoding amount that intracoded frame produces if suitably be identified for the quantization step of intracoded frame quantification.
Therefore, if buffer is about to overflow, the present invention is reducing and has advantage aspect the possibility that buffer overflows by suitably being identified for quantization step that intracoded frame quantizes so.
The 5th execution mode
In the 5th execution mode, according to the remaining space size of buffer by first pattern of correction target encoding amount not and correction target encoding amount two patterns of second pattern between switch to determine the quantization step of inter-frame encoding frame.
[structure]
Figure 16 shows that structure according to the moving image imaging device of the 5th execution mode.
Dynamic image encoding device 35 according to the 5th execution mode has the structure of having added space measurement unit 16, buffer 17 and transmission unit 18 in the dynamic image encoding device 33 according to the 3rd execution mode.Except space measurement unit 16, buffer 17 and transmission unit 18, dynamic image encoding device 35 has and dynamic image encoding device 33 basic the same structures according to the 3rd execution mode, and does not therefore explain here.
Quantization step determining unit 13 is identified for the quantization step that frame (n+1) quantizes according to following formula 18,19 and 20.
When frame (n+1) will carry out intraframe coding:
Qp (n+1)=Qpintra formula 18
The free space that will carry out interframe encode and buffer 17 when frame (n+1) is during greater than pre-sizing:
Qp[n+1] (Cn '/dstC) * Qp[n] formula 19
When the free space that will carry out interframe encode and buffer 17 when frame (n+1) is less than or equal to pre-sizing:
Qp[n+1]=(Cn '/dstC ') * Qp[n] formula 20
In above-mentioned formula, Cn ' and formula 7,8 are the same with 9 Cn ', and dstC ' is the same with dstC ' in the formula 12,13.
Above-mentioned explanation is when the free space of buffer 17 during greater than pre-sizing, with the same first pattern executable operations of operating with first execution mode, and when the free space of buffer 17 is less than or equal to pre-sizing, with the same second mode of operation executable operations with second execution mode.
[operation]
Figure 17 shows that operation according to the dynamic image encoding device 35 of the 5th execution mode.
Dynamic image encoding device 35 starts coding in response to the instruction from microcomputer 4.At first, 35 pairs of frames of dynamic image encoding device 1 carry out intraframe coding (step S51).Because frame 1 does not have preceding frame, so frame 1 intraframe coding always.In the 5th execution mode, to use the initial value of Qpintra when encoding in the conducting frame as quantization step.Then, this dynamic image encoding device 35 encoding amount (step S52) that storage frame 1 produces in frame coded stack 122.Because frame 1 is intraframe coding, C1*P is stored in the frame coded stack 122.
(step S54: not) when free space is less than or equal to pre-sizing, dynamic image encoding device 35 correction target encoding amounts (step S55), and when free space during greater than pre-sizing (step S54: be), dynamic image encoding device 35 is skipped the step 55 that is used for the correction target encoding amount.
Dynamic image encoding device 35 is identified for the coding ratio (step S56) of frame 2 based on the target code amount that obtains.Then, dynamic image encoding device 35 adopts this quantization step of determining that frame 2 is carried out interframe encode (step S57).
Dynamic image encoding device 35 encoding amount (step S58) that storage frame 2 produces in frame coded stack 122.Because frame 2 is an interframe encode, C2 is stored in frame coded stack 122.After this, this dynamic image encoding device 35 repeats operation from step S53 to step S58 up to microcomputer 4 indication stopping imaging.
[effect]
This dynamic image encoding device 35 excess according to multiframe before frame n and the frame n when buffer will overflow according to the 5th execution mode is proofreaied and correct the encoding amount that produces at frame (n+1).Therefore, can reduce the possibility that buffer overflows.
The 6th execution mode
In the 6th execution mode, when frame (n+1) is intraframe coding, determine quantization step based on the quantization step that is used for frame n.This is and the only difference of first execution mode.Other are the same with first execution mode, and therefore do not lay down a definition here.
[structure]
If frame (n+1) carries out intraframe coding, coding correcting unit 12 is not proofreaied and correct the encoding amount of generation.
Quantization step determining unit 13 is identified for the quantization step that frame (n+1) quantizes according to following formula 21,22 and 23.
When frame (n+1) will carry out interframe encode:
Qp[n+1]=(Cn '/dstC) * Qp[n] formula 21
When frame (n+1) will carry out intraframe coding, and frame n is when having carried out interframe encode:
Qp[n+1]=Pq1*Qp[n] formula 22
When frame (n+1) will carry out intraframe coding, and frame n is when having carried out intraframe coding:
Qp[n+1]=Pq2*Qp[n] formula 23
Here, Pq1 and Pq2 are pre-determined factor.Particularly, two coefficients all are set in 5/4 to 4/3 the scope.
Along with the change gradually of FACTOR P q1 and Pq2 is big, the inhibition effect of the encoding amount that intracoded frame produces increases.Yet this causes deteriroation of image quality simultaneously.Simulation result shows by the inhibition effect that FACTOR P q1 and Pq2 is set in 5/4 to 4/3 the scope not only the encoding amount that can the achieve frame intra coded frame produces but also can obtain outstanding picture quality.
[operation]
Figure 18 shows that the detailed maps of determining the quantization step operation according to the 6th execution mode.
And, microcomputer 4 indication to frame (n+1) carry out intraframe coding (step S641: frame in) and frame n carried out interframe encode (step S645: in the time of interframe), this dynamic image encoding device 31 is identified for the quantization step Qp[n+1 that frame (n+1) quantizes] be Pq1*Qp[n] (step S646).If frame n has carried out intraframe coding (step S645: in the frame), this dynamic image encoding device 31 is identified for the quantization step Pq2*Qp[n that frame (n+1) quantizes so] (step S647).
Figure 19 A is depicted as the schematic diagram that changes in chronological order according to the 6th execution mode quantization step, the encoding amount that results from each frame and picture quality to Figure 19 C.
Figure 19 A represents quantization step.In the 6th execution mode, suitably be identified for the quantization step (referring to the step S645 of Figure 18) of intracoded frame.Therefore, shown in Figure 19 A, frame 1,11 adopts different values with 21 quantization step.For example, determine the quantization step of frame 11 based on the quantization step of preceding frame 10.Because do not have frame before the frame 1, fixed value be appointed as the initial value of the quantization step that is used for frame 1.
Figure 19 B presentation code amount.Frame 1 is the same with first execution mode to the encoding amount that frame 10 produces.The encoding amount fundamental sum target code amount of frame 11 and the intracoded frame generation of frame afterwards equates.
Figure 19 C presentation video quality.Because the fluctuation of the encoding amount that can suppress to produce, so picture quality becomes stable.Yet, very little because the encoding amount that intracoded frame (frame 11 and 21) produces keeps, so the whole degeneration of picture quality.
Always the variation of encoding amount is the same substantially with second execution mode in the 6th execution mode, and does not therefore explain at this.
In the 6th execution mode, when carrying out intraframe coding, suitably determine the coding step-length.Therefore, the 6th execution mode is as at second execution mode, and image effect that can obtain and coding become stable.
In this external the 6th execution mode, when intraframe coding, do not consider that the encoding amount of former frame generation is determined quantization step.Therefore and second execution mode relatively can reduce treating capacity in the dynamic image encoding device operation.
The 7th execution mode
In the 7th execution mode, when frame (n+1) is intraframe coding, determine quantization step based on the quantization step that is used for frame n.This is and the only difference of first execution mode.Other are the same with first execution mode, and therefore do not lay down a definition here.
[structure]
Figure 20 shows that structure according to the moving image imaging device of the 7th execution mode.
Dynamic image encoding device 37 comprises coding unit 11, coding correcting unit 12, quantization step determining unit 13 and table memory cell 19.
The table that concerns between the quantization step of table memory cell 19 storage representation frame n and frame (n+1) quantization step.
When frame (n+1) during with intraframe coding, the table of storage is to be identified for the quantization step of frame (n+1) in the quantization step determining unit 13 reference table memory cell 19 based on the quantization step that is used for frame n.
Shown in Figure 21 for being stored in the embodiment of the table of showing memory cell 19.
When frame n was interframe encode, the quantization step that is used for frame (n+1) was defined as Qnew1.When frame n was intraframe coding, the quantization step of frame (n+1) was defined as Qnew2.
[operation]
Shown in Figure 22 for determine the detailed maps of quantization step operation according to the 7th execution mode.
And, microcomputer 4 indication to frame (n+1) carry out intraframe coding (step S741: frame in) and frame n carried out interframe encode (step S745: in the time of interframe), this dynamic image encoding device 37 is identified for the quantization step Qp[n+1 that frame (n+1) quantizes] be Qnew1 (step S746).If frame n has carried out intraframe coding (step S745: in the frame), this dynamic image encoding device 37 is identified for the quantization step Qnew2 (step S747) that frame (n+1) quantizes so.
[effect]
By the 7th execution mode, can obtain the effect the same with the 6th execution mode.
The 8th execution mode
In the 8th execution mode, determine quantization step for each piece line.This piece line is the macro block that becomes a line of arrangement in image with rectangular.
[structure]
Shown in Figure 23 is structure according to the moving image imaging device of the 8th execution mode.
The same substantially according to the dynamic image encoding device 38 of the 8th execution mode with dynamic image encoding device 33 according to the 3rd execution mode, and only have the structure of coding correcting unit 12 and quantization step determining unit 13 to be different from the 3rd execution mode.Therefore, do not explain for components identical here.
This coding correcting unit 12 is measured the encoding amount that each piece line produces, and proofreaies and correct the encoding amount that produces according to the formula 24 that is used to proofread and correct.Notice that in the 8th execution mode, the encoding amount that produces with reference to predetermined number gauge block line is to determine the quantization step of piece line (n+1).Here, illustrate that a frame comprises 7 stick lines, and the preceding 7 stick lines of reference block line (n+1) are with the embodiment of the quantization step that is identified for piece line (n+1).
Cn '=CAna*P1+CAnb*P2 formula 24
In above-mentioned formula, the encoding amount of CAna for producing in the piece line of encoding in the conducting frame in the encoding amount that in 7 nearest stick lines, produces, and the encoding amount that produces in the piece line of encoding between conducting frame in the encoding amount that in 7 nearest stick lines, produces of CAnb.In addition, P1 and P2 are the correction coefficient of P1＜P2 for closing.In the 8th execution mode, be embodiment with the situation of P1=P (0＜P＜1) and P2=1.Correction coefficient P satisfies formula 4.
Quantization step determining unit 13 is identified for the quantization step that piece line (n+1) quantizes according to following formula 25 and 26.
When piece line (n+1) will carry out intraframe coding:
Qp[n+1]=Qpintra formula 25
When piece line (n+1) carries out interframe encode:
Qp[n+1]=(Cn '/dstC ') * Qp[An] formula 26
In above-mentioned formula, Qp[An] be the mean value or the mould value of the quantization step that is used for 7 stick lines that will reference.
Below explanation is used to realize the embodiment of the structure that formula 24 calculates.
Embodiment for coding correcting unit 12 detailed structure shown in Figure 24.
The encoding amount Cn that produces at the piece line n that is encoded by coding unit 11 is measured in encoding measurement unit 121.Register R1 keeps correction coefficient P, and register R2 keeps correction coefficient 1.According to the instruction from microcomputer 4, selector S1 imposes on multiplier M1 with correction coefficient P when piece line n carries out intraframe coding, and when piece line n carries out interframe encode just correction coefficient 1 impose on multiplier M1.
This multiplier M1 multiplies each other the encoding amount Cn of generation and the correction coefficient of appointment.
The shift register of this piece line coded stack 123 for constituting by 7 registers.The result of calculation of sequential storage multiplier M1 in piece line coded stack 123.Adder A1 is the event memory addition, and draws correction coding amount Cn '.
In Figure 24, the encoding amount that C5 produces respectively to C11.In the drawings, suppose that C5 is intraframe coding to C7, and C8 is an interframe encode to C11.
In this case, the result of calculation in adder A1 is following formula 27.
* P+ (C8+C9+C10+C11) formula 27 of Cn '=(C5+C6+C7)
In above-mentioned formula, C5+C6+C7 for the Intra-coded blocks line produce coding total amount CAna, and C8+C9+C10+C11 is the coding total amount CAnb that the inter-coded block line produces.
By said structure, coding correcting unit 12 can pass through formula 24 output calibration encoding amount Cn '.
[operation]
Shown in Figure 25 is operation according to the dynamic image encoding device 38 of the 8th execution mode.
Dynamic image encoding device 38 starts coding in response to the instruction from microcomputer 4.At first, 38 pairs of piece lines of dynamic image encoding device 1 carry out intraframe coding (step S82).Because piece line 1 does not have preceding piece line, so piece line 1 always carries out intraframe coding.When being carried out intraframe coding, uses by the piece line initial value of Qpintra as quantization step.So, this dynamic image encoding device 38 encoding amount (step S82) that memory block line 1 produces in piece line coded stack 123.Because piece line 1 is intraframe coding, C1*P is stored in the piece line coded stack 123.
After this, this dynamic image encoding device 38 repeats operation from step S81 to step S84 up to the coding of finishing piece line 7, and therefore, finishes the intraframe coding of frame 1.
In case finish the intraframe coding of piece line 7, dynamic image encoding device 38 correction target encoding amounts (step S86), and the coding total amount, the quantization step of piece line 1 to 7 and the quantization step (step S87) that the correction target encoding amount is identified for piece line 8 that produce based on piece line 1 to 7.This dynamic image encoding device 38 adopts the quantization step inter-coded block line of determining 8 (step S88).
Dynamic image encoding device 38 encoding amount (step S89) that memory block line 8 produces in piece line coded stack 123.Because piece line 8 is an interframe encode, so C8 is stored in the piece line coded stack 123.After this, dynamic image encoding device 38 repeating step S85 finish imaging to the operation of step S90 up to microcomputer 4 indications.
Shown in Figure 26 for determine the detailed maps of quantization step operation according to the 8th execution mode.
On the other hand, when microcomputer 4 indications were carried out intraframe coding (step S851: in the frame) to piece line (n+1), this dynamic image encoding device 38 was identified for the quantization step Qp[n+1 that piece line (n+1) quantizes] be Qpintra (step S853).
The operation of correction target encoding amount is the same with the 3rd execution mode, does not therefore explain here.
[effect]
Schematic diagram for changing in chronological order shown in Figure 27 according to the 8th execution mode encoding amount.
When being identified for the quantization step of piece line 12, with reference to the encoding amount that is included in 7 stick lines (piece line C5 is to the C11) generation in the A5 part.Be arranged in 7 stick lines of A5 part, the piece line 5 to 7 that is arranged in subdivision A5a is intraframe coding, and therefore will proofread and correct.The piece line 8 to 11 that is arranged in subdivision A5b in the 7 stick lines in the A5 part is interframe encode, and therefore needn't proofread and correct.
State as mentioned above, by determining the quantization step of each piece line, can be the encoding amount adjustment is stable by unit than minor time slice.
The 9th execution mode
In the 9th execution mode, dynamic image encoding device 39 can be carried out from first to the 8th execution mode all types of methods of quantification step-length really, and uses and to choose at random one of them method by the user and determine quantization step.
[structure]
Shown in Figure 28 is structure according to the moving image imaging device of the 9th execution mode.
This moving image imaging device is provided with a mode switch button 7.In addition,, therefore do not explain here with the same according to the moving image imaging device of the 9th execution mode according to the moving image imaging device of first to the 8th execution mode.
Moving image imaging device and dynamic image encoding device based on preferred implementation more than have been described.Yet the present invention is not limited to above execution mode, and following distortion is also included among the present invention.
(1) in above preferred implementation, coding correcting unit 12 is carried out correction by Cn and correction coefficient are multiplied each other, to realize formula Qp[n+1]=(Cn*P/dstC) * Qp[n].Yet the explanation of formula is not limited to above-mentioned execution mode.For example, can adopt following explanation, the encoding amount that alternative corrective produces, the target code amount can be proofreaied and correct and is P/dstC when frame n carries out intraframe coding.In this situation, coding correcting unit 12 shown in Figure 1 is unnecessary, target code amount when quantization step determining unit 13 selects P/dstC to carry out intraframe coding as frame n, and the target code amount when selecting 1/dstC to carry out interframe encode as frame n.
(2) in above preferred implementation, correction coefficient P is a fixed value.Yet correction coefficient P is not limited to fixed value, and can diminish along with the quantization step of frame that will reference and increase, as following formula 28.
P=1/ (Qn-b)+c formula 28
In this formula, b and c are adjustable parameter.
And, also can perhaps determine this quantization step with reference to straight line that is similar to formula 28 or constant with reference to the table that is assigned to each quantization step.
(3) in the 6th execution mode, carry out the correction of target code amount frame by frame.But, also can carry out this correction to each piece line.
(4) coding unit 11 is interpreted as mpeg encoder.But, if can adopting predictive coding and quantize the two, coding unit comes coded data, then coding unit 11 is not limited to mpeg encoder.
(5) in above-mentioned preferred implementation, by calculating the quantization step of definite frame (n+1).Yet, the invention is not restricted to this.For example, can from be stored in the corresponding a plurality of quantization steps of combination with the encoding amount of predictive coding, quantization step and the generation of frame n, select to be used for the quantization step of frame (n+1).In this case, need not just can determine quantization step for each frame calculating.
(6) in above-mentioned preferred implementation, the various parameters of considered frame n (encoding amount of the predictive coding of frame n, quantization step and generation).But, the invention is not restricted to this embodiment, and can adopt the parameter of the arbitrary frame before the frame (n+1).For example, can use the parameter of frame (n-1).
(7) in above-mentioned preferred implementation, consider the various parameters of a frame.But, the invention is not restricted to this.Can use the parameter of a more than frame.Although it is use the parameter of a more than frame to improve the treating capacity of dynamic image encoding device, better to the inhibition effect of fluctuation when adopting the parameter of a more than frame.
Although with by way of example the present invention has been carried out complete description with reference to accompanying drawing, it should be noted, obviously for a person skilled in the art, can make various modification and improvement to the present invention.Therefore, unless these modification and improvement are separated from scope of the present invention, otherwise will think that they comprise in the present invention.
Claims (19)
1, a kind of dynamic image encoding device comprises:
Coding unit is used for each frame of a plurality of frames of moving image is optionally carried out interframe encode or intraframe coding, and this intraframe coding and interframe encode all relate to quantification; And
Determining unit is used for being identified for the quantization step that second frame data quantize according to the encoding amount that results from first frame, wherein
When coding unit carries out interframe encode to the data of second frame, (i) if the data of first frame have been carried out interframe encode, adopt first method to make decision, if perhaps (ii) the data of first frame have been carried out intraframe coding and adopted second method to make decision, the value that obtains by the quantization step that adopts second method to determine is less than the quantization step by adopting first method to determine.
2, dynamic image encoding device according to claim 1 is characterized in that, described second method is provided with in the mode in 1/5 to 1/3 the scope of the quantization step that drops into first method of employing by the quantization step that adopts second method to determine and determine.
3, dynamic image encoding device according to claim 1 is characterized in that, this device further comprises:
Difference obtains the unit, is used for obtaining (i) and results from first frame and prior to the accumulation encoding amount of each frame of first frame and (ii) first frame and prior to the difference between the accumulation predictive encoding aim parameter in each frame of first frame, wherein
First method and second method are big and mode that increase is provided with along with the difference quantitative change of the encoding amount that produces with the quantization step determined.
4, dynamic image encoding device according to claim 3, it is characterized in that, the encoding amount that produces in accumulation is during less than the cumulative target encoding amount, and first and second methods are big and become big mode and be provided with along with the coding quantitative change that produces with quantization step, and do not consider the difference amount.
5, dynamic image encoding device according to claim 3 is characterized in that, this device further comprises:
The buffer that is used for the storing moving image coded data, wherein
When described buffer had pre-sizing or bigger free space, this first and second method was big and become big mode and be provided with along with the coding quantitative change that produces with quantization step, and does not consider the difference amount.
6, dynamic image encoding device according to claim 1 is characterized in that, when coding unit will carry out intraframe coding to the data of second frame, it was quantization step that described determining unit is set fixed value.
7, dynamic image encoding device according to claim 1 is characterized in that,
When the digital coding of described coding unit first frame will be carried out intraframe coding to second frame data later on, determining unit is determined quantization step by adopting third party's method, and the value that the quantization step of determining by employing third party method obtains is greater than the value of determining by first method.
8, dynamic image encoding device according to claim 1 is characterized in that, this device further comprises:
The buffer that is used for the storing moving image coded data, wherein
When coding unit will carry out intraframe coding to the data of second frame later on to first frame data coding, determining unit (i) is if buffer has pre-sizing or bigger free space, the setting quantization step is a fixed value, if and the free space of (ii) buffer existence is less than preliminary dimension, adopt third party's method to determine quantization step, the value that the quantization step of determining by employing third party method obtains is greater than the value of determining by first method.
9, dynamic image encoding device according to claim 1, it is characterized in that, at described coding unit the data of first frame are encoded the back will carry out intraframe coding to second frame data time, determining unit is determined the quantization step of second frame based on being used for the quantization step that first frame quantizes, and does not consider the encoding amount that produces.
10, dynamic image encoding device according to claim 9, it is characterized in that, in the time of will carrying out intraframe coding to second frame data after coding unit is encoded to the data of first frame, determining unit is by being multiply by the quantization step that the quantization step that is used for first frame is identified for second frame by predetermined value.
11, dynamic image encoding device according to claim 10 is characterized in that, described predetermined value is in 5/4 to 4/3 scope.
12, dynamic image encoding device according to claim 9 is characterized in that, this device further comprises:
Record cell is used to write down the table that concerns between the quantization step of expression first frame and the second frame quantization step, wherein
Determining unit is by being identified for the quantization step of second frame based on the quantization step that is used for first frame with reference to described table.
13, dynamic image encoding device according to claim 9 is characterized in that, described determining unit is identified for the quantization step of second frame based on each quantization step of the preceding frame that also is useful on scheduled volume except that the quantization step that is used for first frame.
14, a kind of dynamic image encoding device comprises:
Coding unit is used for each data of many sticks of moving image line are optionally carried out interframe encode or intraframe coding, and interframe encode and intraframe coding all relate to quantification;
Correcting unit, be used for the encoding amount that the piece line of one or more interframe encode that (i) adopt first method to proofread and correct the encoding block line of scheduled volume produces, and (ii) adopting second method to proofread and correct the encoding amount that one or more Intra-coded blocks line in the encoding block line of scheduled volume produces, the value that the encoding amount that produces by the one or more inter-coded block line that adopts second method to proofread and correct obtains is less than the value of proofreading and correct by first method; And
Determining unit when coding unit will carry out interframe encode to the data of next piece line, is used for being identified for based on the coding total amount of Intra-coded blocks line of having proofreaied and correct and the generation of inter-coded block line the quantization step of next piece line data-measuring.
15, dynamic image encoding device according to claim 14, it is characterized in that second method is set in the mode that falls into by the encoding amount that adopts second method to produce in 1/5 to 1/3 the scope that adopts encoding amount that first method proofreaies and correct in one or more inter-coded block lines.
16, a kind of moving image imaging device comprises:
Image device is used to gather target image and produces moving image;
Coding unit is used for each data of each moving image multiframe are optionally carried out interframe encode or intraframe coding, and interframe encode and intraframe coding all relate to quantification; And
Determining unit is used for being identified for the quantization step that second frame data quantize according to the encoding amount that first frame produces, wherein
When coding unit will carry out interframe encode to the data of second frame, by (i) if the data of first frame interframe encode, adopt first method to make decision, if perhaps (ii) the intraframe coding of the data of first frame adopts second method to make decision, the value that obtains by the quantization step that adopts second method to determine is less than the quantization step by adopting first method to determine.
17, a kind of moving image imaging device comprises:
Image device is used to gather target image and produces moving image;
Coding unit is used for each data of many sticks line of moving image are optionally carried out interframe encode or intraframe coding, and interframe encode and intraframe coding all relate to quantification;
Correcting unit, be used for (i) and adopt the encoding amount of first method correction in the piece line generation of one or more interframe encode of the encoding block line of scheduled volume, and (ii) adopting second method to proofread and correct the encoding amount that one or more Intra-coded blocks line in the encoding block line of scheduled volume produces, the value that the encoding amount that produces by the one or more inter-coded block line that adopts second method to proofread and correct obtains is less than the encoding amount of proofreading and correct by first method; And
Determining unit when coding unit will carry out interframe encode to the data of next piece line, is used for being identified for based on the coding total amount of Intra-coded blocks line of having proofreaied and correct and the generation of inter-coded block line the quantization step of next piece line data-measuring.
18, a kind of dynamic image encoding method comprises:
Coding step optionally carries out interframe encode or intraframe coding to each data of multiframe in the moving image, and interframe encode and intraframe coding all relate to quantification;
Determining step is determined the quantization step that second frame data quantize according to the encoding amount that first frame produces, wherein
In the time will carrying out interframe encode to the data of second frame, by (i) if the data of first frame interframe encode adopt first method to make decision, if perhaps (ii) the intraframe coding of the data of first frame adopts second method to make decision, the value that obtains by the quantization step that adopts second method to determine is less than the quantization step by adopting first method to determine.
19, a kind of dynamic image encoding method comprises:
Coding step optionally carries out interframe encode or intraframe coding to each data of polylith line in the moving image, and interframe encode and intraframe coding all relate to quantification;
Aligning step, (i) adopt first method to proofread and correct the encoding amount that one or more inter-coded block line in the encoding block line of scheduled volume produces, and (ii) adopting second method to proofread and correct the encoding amount that one or more Intra-coded blocks line in the encoding block line of scheduled volume produces, the value that the encoding amount that produces by the one or more inter-coded block line that adopts second method to proofread and correct obtains is less than the encoding amount of proofreading and correct by first method; And
Determining step in the time will carrying out interframe encode to the data of next piece line, is used for being identified for based on the coding total amount of Intra-coded blocks line of having proofreaied and correct and the generation of inter-coded block line the quantization step of next piece line data-measuring.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004264418 | 2004-09-10 | ||
| JP2004264418 | 2004-09-10 | ||
| JP2005255228 | 2005-09-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1747553A true CN1747553A (en) | 2006-03-15 |
| CN100477794C CN100477794C (en) | 2009-04-08 |
Family
ID=36166851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510102459 Active CN100477794C (en) | 2004-09-10 | 2005-09-09 | Moving picture coding apparatus, moving picture coding method, and moving picture imaging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100477794C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045566A (en) * | 2009-10-20 | 2011-05-04 | 佳能株式会社 | Image processing apparatus and control method for the same |
| CN102106147A (en) * | 2008-09-29 | 2011-06-22 | 松下电器产业株式会社 | Method for encoding moving picture and moving picture encoding device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0139154B1 (en) * | 1994-07-08 | 1998-06-15 | 김광호 | Coding method in a neural network |
| CN1151685C (en) * | 1997-02-12 | 2004-05-26 | 萨尔诺夫公司 | Appts. and method for optimizing rate control in coding system |
-
2005
- 2005-09-09 CN CN 200510102459 patent/CN100477794C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102106147A (en) * | 2008-09-29 | 2011-06-22 | 松下电器产业株式会社 | Method for encoding moving picture and moving picture encoding device |
| CN102106147B (en) * | 2008-09-29 | 2013-06-19 | 松下电器产业株式会社 | Method for encoding moving picture and moving picture encoding device |
| CN102045566A (en) * | 2009-10-20 | 2011-05-04 | 佳能株式会社 | Image processing apparatus and control method for the same |
| CN102045566B (en) * | 2009-10-20 | 2013-11-06 | 佳能株式会社 | Image processing apparatus and control method for the same |
| US8873869B2 (en) | 2009-10-20 | 2014-10-28 | Canon Kabushiki Kaisha | Image processing apparatus and control method for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100477794C (en) | 2009-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1206864C (en) | Association rate distortion optimized code rate control method and apparatus thereof | |
| CN100338958C (en) | Moving picture encoding apparatus | |
| CN1251518C (en) | Method for converting digital signal and apparatus for converting digital signal | |
| CN1719905A (en) | Coding apparatus, coding method, coding method program, and recording medium recording the coding method program | |
| CN1315331C (en) | Video signal converter, video signal conversion method and video service system | |
| CN101039421A (en) | Method and apparatus for realizing quantization in coding/decoding process | |
| CN1993993A (en) | Image processing device, program thereof, and method thereof | |
| CN1335724A (en) | Coding apparatus and coding method | |
| CN1596547A (en) | Moving picture coding apparatus, moving picture decoding apparatus, moving picture coding method, moving picture decoding method, program, and computer-readable recording medium containing the program | |
| CN1701616A (en) | Image information encoding device and method, and image information decoding device and method | |
| CN1926863A (en) | Multi-pass video encoding | |
| CN1874409A (en) | Image signal processing apparatus, camera system and image signal processing method | |
| CN1801945A (en) | Coded video sequence conversion apparatus, method and program product for coded video sequence conversion | |
| CN1744720A (en) | Variable length decoding device | |
| CN1314053A (en) | Compression encoding method, recorded medium on which compression encoding program is recorded, and imaging device | |
| CN1114126A (en) | Device and method for encoding image | |
| CN1436004A (en) | Orthogonal transformation, inverse orthogonal transformation method and device, and encoding and decoding method and device | |
| CN1662069A (en) | Method for encoding/decoding image and video signals | |
| CN1838776A (en) | Decoding apparatus, dequantizing method, and program thereof | |
| CN1229758C (en) | Resolution ratio transforming device and method of orthogonal transformation image | |
| CN1747553A (en) | Moving picture coding apparatus, moving picture coding method, and moving picture imaging apparatus | |
| CN1288641A (en) | Video Signal encoding method, video signal encoder, and program recorded medium | |
| CN1838723A (en) | Decoding device, distribution estimation method, decoding method and programs thereof | |
| CN1917645A (en) | Method for encoding block of coefficient | |
| CN1809170A (en) | Discrete cosine transform method and apparatus applicable to image coding and video coding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200605 Address after: Japan Patentee after: Panasonic semiconductor solutions Co.,Ltd. Address before: Osaka Patentee before: Panasonic Corp. |
|
| TR01 | Transfer of patent right |