CN100534187C - Output buffer method of pixel data for joint photographic experts group image - Google Patents
Output buffer method of pixel data for joint photographic experts group image Download PDFInfo
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- CN100534187C CN100534187C CN 200710098210 CN200710098210A CN100534187C CN 100534187 C CN100534187 C CN 100534187C CN 200710098210 CN200710098210 CN 200710098210 CN 200710098210 A CN200710098210 A CN 200710098210A CN 100534187 C CN100534187 C CN 100534187C
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Abstract
The method includes steps: receiving a minimal encoding unit (MEU) of united picture experts group (UPEG) image and the MEU contains multiple pixel units; carrying out scale adjustment for MEU so as to obtain scale adjusted MEU; based on format of UPEG to decide rule for storing the scale adjusted MEU in a memory module; based on the decided storing rule to select a memory in the memory module, and writing the data contained in the scale adjusted MEU to the selected memory; based on format of UPEG to decide output mode of the data contained in the scale adjusted MEU; finally, based on the decided output mode to output the data contained in the scale adjusted MEU to a frame buffer from the memory module.
Description
Technical field
The invention relates to image processing, particularly relevant for JPEG (joint photographic experts group) (Joint Photographic Experts Group, JPEG) processing module of image and method.
Background technology
JPEG (joint photographic experts group) (JPEG) image standard be by International Standards Organization (International Standard Organization, ISO) and (the Consultative Committee of International Telegraph ﹠amp of CCITT; Telephone CCITT) formulates, and is image compressed format commonly used.The JPEG image is divided into multiple form at present, comprises 420,422V, 411,422H and 444.Because JPEG is the saving format after the image compression, therefore when desiring to represent a JPEG image on screen the time, the JPEG image must just can be showed on the screen earlier through deciphering to be reduced to the image of script.
Any jpeg format no matter, the JPEG image all is that (Minimum Coded Unit MCU) deciphers for the unit with the minimum code unit.One minimum code unit comprises a plurality of block of pixels (pixel block).The pixel data that comprises 8 row * 8 row (promptly 64) according to block of pixels, pixel data can be divided into brightness (intensity) component and aberration (color) component again, the wherein brightness of luminance component performance pixel data, color difference components then shows the color of pixel data.Therefore, block of pixels can be divided into block of pixels that stores luminance component and the block of pixels that stores color difference components.
Figure 1A display format is 420 and the minimum code unit of the JPEG image of 422V.Form is that the pixel data of 420 JPEG image 100 can be divided into luminance component 102, blue color difference component 104 and red color component 106, and a minimum code unit of JPEG image 100 comprises six block of pixels 112～117, wherein four block of pixels Y0～Y3 stores the pixel data of luminance components, and two block of pixels Cb, Cr store the pixel data of color difference components.Same, form is that the pixel data of the JPEG image 120 of 422V can be divided into luminance component 122, blue color difference component 124 and red color component 126, and a minimum code unit of JPEG image 120 comprises four block of pixels 132～135, wherein two block of pixels Y0, Y2 store the pixel data of luminance components, and two block of pixels Cb, Cr store the pixel data of color difference components.
Figure 1B display format is 411, the minimum code unit of 422H and 444 JPEG image.Form is that the pixel data of 411 JPEG image 140 can be divided into luminance component 142, blue color difference component 144 and red color component 146, and a minimum code unit of JPEG image 140 comprises six block of pixels 152～157, wherein four block of pixels Y0, Y1 store the pixel data of luminance components, and two block of pixels Cb, Cr store the pixel data of color difference components.Same, form is that the pixel data of the JPEG image 160 of 422H can be divided into luminance component 162, blue color difference component 164 and red color component 166, and a minimum code unit of JPEG image 160 comprises four block of pixels 172～175, wherein two block of pixels Y0, Y1 store the pixel data of luminance components, and two block of pixels Cb, Cr store the pixel data of color difference components.In addition, form is that the pixel data of 444 JPEG image 180 can be divided into luminance component 182, blue color difference component 184 and red color component 186, and a minimum code unit of JPEG image 180 comprises three block of pixels 192～194, wherein block of pixels Y0 stores the pixel data of luminance component, and the pixel data of two block of pixels Cb, Cr storage color difference components.
When the JPEG image when decoding finishes, because the size of the JPEG image after the decoding may not be certain to be consistent with screen size, therefore the JPEG image needs in advance through ratio adjustment (scaling), with the resolution that reduces the JPEG image or pixel data amount to the degree that meets for screen shows.Then, adjusted JPEG image data can be stored in earlier in the middle of the buffer module, after waiting for that screen sends the requirement that obtains pixel data, the pixel data of image is exported to the frame buffer (frame buffer) of screen again.
Image data is exported to the frame buffer of screen by buffer module output mode has 1 byte single output mode, 8 byte running fires output (8 bytes burst write out) pattern and 16 byte running fires output (16 bytes burst write out) pattern respectively.Under 1 byte single output mode, each buffer module is only exported the pixel data of 1 byte to frame buffer.Under 8 bytes or 16 byte running fire output modes, the pixel data of each buffer module exportable 8 bytes of difference and 16 bytes is to frame buffer.When the pixel data amount that comprises when the JPEG image is big, must adopt 8 bytes or 16 byte running fire output modes, just can meet the demand data amount of screen shows image.
For example, resolution is that 800 * 600 portable JPEG image (motion JPEG) per second need be changed 30 images, the per second data volume of required transmission is 21.6M (800 * 600 * 30 * 1.5=21.6M) bytes, wherein parameter 1.5 is the color difference components that need cooperate 0.5 unit because of the luminance component of per unit, if being the clock signal of 125MHz with the frequency, system operates, then the data of every byte need to finish transmission in the individual clock pulse of 5.787 (125MHz/21.6M=5.787) in the cycle, are great loads to system.Otherwise if under 8 bytes or 16 byte running fire output modes, because once the data volume of transmitting is respectively 8 times and 16 times, each Data transmission can be waited for 46.296 and 92.252 clock pulse cycles respectively.Therefore, buffer should adopt 8 bytes or 16 byte running fire output modes, to carry out the transmission of pixel data.
In addition, general buffer needs tens thousand of memory capacity to megabyte for complete storage is shown in the pixel data of screen.The memory capacity of buffer is bigger, and the required production cost that expends is higher.If can use the buffer of small storage capacity, and buffer still can be brought into play same function to deal with the demand data amount of Data transmission, then can reduce production costs.Therefore, have output at a high speed simultaneously and the limited buffer of memory capacity, the then usefulness that can reduce production costs simultaneously and promote buffer if can provide.
Summary of the invention
In view of this, (JointPhotographic Experts Group, the JPEG) output buffer method of the pixel of image (pixel) data is to solve the problem that known technology exists to the invention provides a kind of JPEG (joint photographic experts group).At first, (Minimum Coded Unit, MCU), wherein this minimum code unit comprises a plurality of pixel datas to receive a minimum code unit of this JPEG image.Then, this minimum code unit is carried out ratio adjustment (scaling), to obtain the minimum code unit of (scaled) after the ratio adjustment.Then, according to the form of this JPEG image, determine the storage rule of this scale adjusted MEU in a memory module.Then, according to this storage rule that is determined, choose a memory that comprises in this memory module, the pixel data that this scale adjusted MEU was comprised being write this selected memory, the required memory capacity of the block of pixels of the minimum code unit after this ratio adjustment is handled is less than the memory capacity of this memory.Then, according to the form of this JPEG image, decision is with the output mode of this scale adjusted MEU output.At last, this output mode according to being determined exports the pixel data that this scale adjusted MEU comprised to a frame buffer (frame buffer) by this memory module; Wherein, the step that the pixel data that this scale adjusted MEU comprised is write this selected memory comprises: one first block of pixels of this scale adjusted MEU is stored in this memory, the preceding one part of pixel of one second block of pixels of this scale adjusted MEU also is stored in this memory; According to another memory that is comprised in this this memory module of storage rule selection, to store the back one part of pixel of this second block of pixels.
The present invention more provides a kind of JPEG (joint photographic experts group) (Joint PhotographicExperts Group, JPEG) the output buffer module of the pixel of image (pixel) data.This buffer module comprises adjusting module, memory access control module, memory module and output buffer control module.Adjusting module receives a minimum code unit (the Minimum Coded Unit of this JPEG image, MCU), and this minimum code unit carried out ratio adjustment (scaling) to obtain the minimum code unit of (scaled) after the ratio adjustment, wherein this minimum code unit comprises a plurality of pixel datas.The memory module access control module is according to the form of this JPEG image, to determine the storage rule of this scale adjusted MEU in a memory module.This memory module is chosen a memory that comprises in this memory module, the pixel data that this scale adjusted MEU was comprised is write this selected memory according to this storage rule that is determined.The output mode that the output buffer control module is exported this scale adjusted MEU according to the format determination of this JPEG image, and, export the pixel data that this scale adjusted MEU comprised to a frame buffer (frame buffer) by this memory module according to this output mode that is determined.
The output buffer method of the pixel data of joint photographic experts group image of the present invention, the usefulness that can reduce the production cost of buffer simultaneously and promote buffer.
Description of drawings
Figure 1A display format is 420 and the minimum code unit of the JPEG image of 422V;
Figure 1B display format is 411, the minimum code unit of 422H and 444 JPEG image;
Fig. 2 is the block diagram according to the output buffer module of the pixel data of JPEG image of the present invention;
Fig. 3 is the flow chart according to the output buffer method of the pixel data of JPEG image of the present invention;
Fig. 4 is the flow chart according to the determining method of output mode of the present invention;
Fig. 5 is the flow chart according to the system of selection of memory storage rule of the present invention;
Fig. 6 A shows the first memory selection rule;
Fig. 6 B shows the second memory selection rule;
Fig. 7 A is the schematic diagram that the first memory selection rule operates in memory module;
Fig. 7 B is the schematic diagram that the second memory selection rule operates in memory module;
Fig. 7 C is another schematic diagram that the second memory selection rule operates in memory module.
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, several preferred embodiments cited below particularly, and cooperate appended diagram, be described in detail below.
Fig. 2 is the block diagram according to the buffer module 200 of the output pixel data (pixel data) of JPEG image of the present invention.Buffer module 200 comprises adjusting module 202, memory module 204, memory access control module 206, output buffer control module 208.Buffer module 200 can be under the memory span condition of limited, still can cushion from anti-discrete cosine conversion (Inverse Discrete Cosine Transformation, IDCT) pixel data of module decoding, and pixel data is exported to the frame buffer (frame buffer) of screen with high data speeds.The memory module 204 of buffer module 200 can comprise six memories (not shown), is respectively first memory to the six memories.Each memory just can store the block of pixels of one 8 row * 8 row, that is the capacity of each memory is that 64 (8 * 8=64) bytes, wherein a pixel occupies a bytes of memory capacity.Therefore, under the specific design of the present invention, six memories of memory module 204 only need 384 altogether, and (64 * 6=384) individual bytes just are enough to cushion the demand data amount of JPEG image, and do not need to need a large amount of memory capacity as in the known technology.
Fig. 3 is the flow chart according to the output buffer method 300 of the pixel data of JPEG image of the present invention.Output buffer method 300 can be used for the inner working of buffer module 200 of key diagram 2.As previously mentioned, the JPEG image is in exporting resolution and the size of the necessary before elder generation of screen shows according to the adjusted size JPEG image of screen to.Therefore, adjusting module 202 at first receives a minimum code unit of JPEG image (Minimum Coded Unit, MCU), wherein this minimum code unit comprises a plurality of pixel datas in step 302.Whether must meet this moment according to the size of image and frame buffer, whether this minimum code unit carried out ratio adjustment (scaling) with decision, and adjust the resolution of image.If image need adjust, then adjusting module 202 carries out the ratio adjustment to this minimum code unit in step 304, to obtain the minimum code unit of (scaled) after the ratio adjustment.
The pixel data of scale adjusted MEU then is sent to memory module 204, to store.In memory module 204, first memory to the three memories are in order to the pixel data of the luminance component (intensity) of storage scale adjusted MEU, and the 4th memory to the six memories are in order to the pixel data of the color difference components (color) of storage scale adjusted MEU.Certainly, if the ratio adjustment of the unjustified module 202 in minimum code unit also is stored in the memory module 204.Because the capacity of memory module 204 only has 384 bytes, therefore need be by the storage location of pixel data in memory module 204 of a memory access control module 206 decision inputs, properly to finish the work of buffering pixel data.At first in step 306, determine the specific storage rule of pixel data in memory module 204 according to the form of JPEG image by memory access control module 206.Then, memory module 204 just can be chosen a memory, pixel data is write in this selected memory according to the storage rule that is determined in step 308 in memory module 204.Storage rule about memory can be elaborated with Fig. 5, Fig. 6 and Fig. 7 A～Fig. 7 C in subsequent paragraph.
Then, be responsible in memory module 204, capturing pixel data, and export pixel data the frame buffer of screen to, to carry out the displaying of image by output buffer control module 208.According to the form of the JPEG image output mode with the decision output pixel data, this output mode can be 8 bytes or 16 byte running fire output modes to output buffer control module 208 in step 310.The determining method of output mode will describe with Fig. 4.Then, output buffer control module 208 and in step 312, export pixel data to frame buffer by memory module 204 according to output mode.Step 302 can repeat to 312, until the pixel data of JPEG image all till output finishes.
Fig. 4 is the flow chart according to the determining method 400 of output mode of the present invention, but output buffer control module 208 Using such method are selected the output mode of pixel data.The pixel data that at first judges whether storage in the memory module 204 in step 401 is handled through the ratio adjustment of adjusting module 202.If handle, then directly in step 408, determine to carry out the output of pixel data with 16 byte running fire output modes without the ratio adjustment.If pixel data is handled through the ratio adjustment, then can be according to image format to select the output mode of pixel data.If the form of JPEG image in step 402 be Figure 1B 411,422H or 444, the pixel data that then stores luminance component will be exported with 16 byte running fire output modes in step 408.If the form of JPEG image is 420 or the 422V of Figure 1A in step 402, the pixel data that then stores luminance component will be exported with 8 byte running fire output modes in step 406.In addition, JPEG image form why no matter, the pixel data that stores color difference components also will be exported (not shown) with 8 byte running fire output modes if the ratio adjustment was handled in step 406.
Fig. 5 is the flow chart according to the system of selection 500 of memory storage rule of the present invention, memory access control module 206 according to the method with the decision storage rule of pixel data in memory module 204.Store rule and be divided into first memory selection rule and second memory selection rule, will its details be described with Fig. 6 A～Fig. 6 B and Fig. 7 A～Fig. 7 C, paragraph then describes for the system of selection 500 that stores rule earlier at present.Memory access control module 206 at first distinguishes that in step 501 whether the pixel data of JPEG image is handled through the ratio adjustment of adjusting module 202.If the minimum code unit of input image is handled without the ratio adjustment, no matter then be the luminance component block of pixels or the color difference components block of pixels of minimum code unit, all in step 510 decision with the second memory cell selection rule, the memory cell that will write with the residual pixel of choosing this minimum code unit.
If the minimum code unit of input image is handled through the ratio adjustment, to be luminance component or color difference components then in the block of pixels of step 502 differentiation input.If color difference components is then still chosen the second memory cell selection rule for storing rule in step 510.If luminance component is then further chosen different storage rules according to the form of JPEG image in step 503.If determining the JPEG image format in step 504 is 420 or 422V, and three memories that determine the storage luminance component in step 506 are non-for (for example filling up two, only fill up under the situation of a memory), then in step 508, choose the first memory cell selection rule for storing rule.Otherwise, the JPEG image format is 411,422H or 444 if determine in step 504, or determining the JPEG image format in step 504 is 420 or 422V but determine three memories that store luminance component in step 506 and filled up two, then chooses the second memory cell selection rule for storing rule in step 510.
Address, memory module 204 comprises first memory to the six memories before, and each memory can hold the block of pixels of (8 * 8) individual pixel.The pixel data of first to the 3rd memory storage luminance component wherein, and the pixel data of the 4th to the 6th memory storage color difference components.Because the block of pixels of the minimum code unit of image is handled to reduce resolution through the ratio adjustment before storing, block of pixels can be reduced to and be comprised that (block of pixels of individual pixel of n * n), wherein n is a natural number and smaller or equal to 8 by the block of pixels that originally comprises (8 * 8) individual pixel.Therefore, the required memory capacity of block of pixels after the ratio adjustment is handled can be less than the memory capacity of a memory, and the residue memory capacity of this memory then can be in order to store other block of pixels.So two parts before and after block of pixels is stored in the memory in regular turn, and the partial pixel block can be cut into are stored in respectively in two different memories.When the preceding part of block of pixels has write to the memory edge that writes at present, just need to choose next memory, to store a back remainder of block of pixels according to the storage rule that is determined.
Fig. 6 A and Fig. 6 B show first memory selection rule 600 and second memory selection rule 650 respectively, and wherein rule 600 and 650 only illustrates with first memory, second memory, the 3rd memory that stores luminance component.In the first memory selection rule of Fig. 6 A 600 times, when the memory that writes at present is respectively first memory, second memory and the 3rd memory, it is next memory that memory access control module 206 can be chosen the 3rd memory, first memory and second memory respectively in regular turn, to write residual pixel.And in the second memory selection rule of Fig. 6 B 650 times, when the memory that writes at present is respectively this first memory, second memory and the 3rd memory, it is next memory that memory access control module 206 can be chosen this second memory, the 3rd memory and first memory respectively in regular turn, to write residual pixel.In like manner, if the objective for implementation of first memory and second memory selection rule is for storing the 4th memory, the 5th memory, the 6th memory of color difference components, then first memory, second memory, the 3rd memory that writes at present among Fig. 6 A and Fig. 6 B corresponds respectively to the 4th memory, the 5th memory, the 6th memory.
Next the actual operation situation of first and second memory selection rule will be described with example.Fig. 7 A is the schematic diagram that first memory selection rule 600 operates in memory module 204.The block of pixels of supposing input is the luminance component of 420 minimum code unit for the JPEG image format, as the Y0～Y3 of the minimum code unit 100 of Figure 1A, then memory access control module 206 can select first memory selection rules 600 for storing rule according to system of selection 500.At first block of pixels Y0 is stored in the first memory.Because first memory still has remaining space, therefore also the preceding part of next block of pixels Y1 also is stored in the first memory.Must select next memory this moment according to the first memory selection rule 600 of Fig. 6 A, to store the back one part of pixel of block of pixels Y1.Select three memory according to rule 600 this moment is next memory, so the back part of block of pixels Y1 is stored in the 3rd memory.
Then, because present memory is the 3rd memory, therefore choosing second memory according to rule 600 is next memory, to store block of pixels Y2.Because second memory still has remaining space, therefore also the preceding part of next block of pixels Y3 is stored in the second memory.This moment is because first memory fills up, so a part is output to frame buffer before the block of pixels Y0 that stores of first memory and the Y1, so first memory storage data again.Therefore selecting first memory according to rule 600 is next memory, to store the back part of block of pixels Y3.
Fig. 7 B is the schematic diagram that second memory selection rule 650 operates in memory module 204.Suppose that memory module 204 continues to receive the luminance component block of pixels that above-mentioned form is next minimum code unit of 420 JPEG image.The memory that write this moment at present is the 3rd memory, and still selecting second memory according to rule 600 is next memory, to store the preceding part of block of pixels Y1.This moment, the edge owing to the 3rd memory and second memory all filled up, therefore there are two to fill up block of pixels in three memories to its edge, thereby must change according to system of selection 500 that to store rule be second memory selection rule 650, shown in Fig. 6 B.Since before the 3rd memory fill up, therefore a preceding part and other block of pixels of the block of pixels Y0 of the 3rd memory storage have been output to frame buffer, therefore the 3rd memory storage data again.This moment, present memory was a second memory, and therefore choosing the 3rd memory according to rule 650 is next memory, to store the remainder of block of pixels Y1.
Because the memory that writes at present is the 3rd memory, therefore selecting first memory according to rule 650 is next memory, to store the preceding part of next block of pixels Y2.Then, selecting second memories according to rule 650 be next memory, with the back part of storage block of pixels Y2, and continues to insert the preceding part of next block of pixels Y3.Therefore this moment is because first memory is removed, and only surplus second memory has filled up block of pixels to its edge in three memories, thereby must to change the storage rule according to system of selection 500 be first memory selection rule 600.Therefore, selecting first memory according to rule 600 is next memory, to store the back part of block of pixels Y3.
Fig. 7 C is another schematic diagram that second memory selection rule 650 operates in memory module 204.The block of pixels of supposing input is the luminance component of the minimum code unit of 422H for the JPEG image format, as the Y0～Y1 of the minimum code unit 160 of Figure 1B, then memory access control module 206 can select second memory selection rules 650 for storing rule according to system of selection 500.Suppose that the memory that writes at present is a first memory, then at first store the preceding part of block of pixels Y0 with first memory.Then selecting second memories according to rule 650 be next memory, with the back part of storage block of pixels Y0, and continues to insert the preceding part of next block of pixels Y1.Then, selecting the 3rd memory according to rule 650 is next memory, to store the back part of block of pixels Y1.
The invention provides a kind of output buffer method of pixel data of JPEG image,, still can bring into play high data output rating, to satisfy the more and more big JPEG image format of demand data speed with under limited memory capacity.JPEG image format according to different the invention provides different data output modes and memory storage rule, with under the restriction of memory capacity, according to image format pixel data is carried out different buffered.Therefore, the present invention's usefulness that can reduce the production cost of buffer simultaneously and promote buffer.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
200: the output buffer module
202: adjusting module
204: memory module
206: memory access control module
208: the output buffer control module
Claims (10)
1. the output buffer method of the pixel data of a joint photographic experts group image is characterized in that, comprising:
Receive a minimum code unit of this joint photographic experts group image, wherein this minimum code unit comprises a plurality of pixel datas;
This minimum code unit is carried out the ratio adjustment, to obtain a scale adjusted MEU;
According to the form of this joint photographic experts group image, determine the storage rule of this scale adjusted MEU in a memory module;
According to this storage rule that is determined, choose a memory that is comprised in this memory module, the pixel data that this scale adjusted MEU was comprised being write this selected memory, the required memory capacity of the block of pixels of the minimum code unit after this ratio adjustment is handled is less than the memory capacity of this memory;
According to the form of this joint photographic experts group image, decision is with an output mode of this scale adjusted MEU output; And
This output mode according to being determined exports the pixel data that this scale adjusted MEU comprised to a frame buffer by this memory module;
Wherein, the step that the pixel data that this scale adjusted MEU comprised is write this selected memory comprises:
One first block of pixels of this scale adjusted MEU is stored in this memory, the preceding one part of pixel of one second block of pixels of this scale adjusted MEU also is stored in this memory;
According to another memory that is comprised in this this memory module of storage rule selection, to store the back one part of pixel of this second block of pixels.
2. the output buffer method of the pixel data of joint photographic experts group image according to claim 1 is characterized in that, the ratio adjustment of this minimum code unit is the size that the size when making this joint photographic experts group image output meets this frame buffer.
3. the output buffer method of the pixel data of joint photographic experts group image according to claim 1, it is characterized in that, comprise six memories in this memory module, wherein first group of three memory that memory comprised are in order to the pixel data of the luminance component that stores this scale adjusted MEU, be respectively first memory, second memory and the 3rd memory, and second group of three memory that memory comprised are respectively the 4th memory in order to the pixel data of the color difference components that stores this scale adjusted MEU, the 5th memory and the 6th memory.
4. the output buffer method of the pixel data of joint photographic experts group image according to claim 3, it is characterized in that, described six memories can store the capable block of pixels data volume of a m row * m respectively, without the luminance component of the minimum code unit of ratio adjustment or the pixel data of color difference components is the capable block of pixels of a plurality of m row * m, and the pixel data of the luminance component of scale adjusted MEU or color difference components is the capable block of pixels of a plurality of n row * n, and wherein n is a natural number and smaller or equal to m.
5. the output buffer method of the pixel data of joint photographic experts group image according to claim 3, it is characterized in that, this storage rule comprises first memory selection rule and second memory selection rule, wherein the memory that ought write at present is respectively this first memory, when second memory and the 3rd memory, this first memory selection rule is chosen the 3rd memory respectively, first memory and second memory are that next memory is to write residual pixel, and the memory that ought write at present is respectively this first memory, when second memory and the 3rd memory, this second memory selection rule is chosen this second memory respectively, the 3rd memory and first memory are that next memory is to write residual pixel.
6. the output buffer method of the pixel data of joint photographic experts group image according to claim 5, it is characterized in that, when the memory that writes at present is respectively the 4th memory, when the 5th memory and the 6th memory, this first memory selection rule is chosen the 6th memory respectively, the 4th memory and the 5th memory are that next memory is to write residual pixel, and the memory that ought write at present is respectively the 4th memory, when the 5th memory and the 6th memory, this second memory selection rule is chosen the 5th memory respectively, the 6th memory and the 4th memory are that next memory is to write residual pixel.
7. the output buffer method of the pixel data of joint photographic experts group image according to claim 5, it is characterized in that, when if object pixel data of this memory module of input are the luminance component of this scale adjusted MEU, the storage rule of this scale adjusted MEU is to determine according to following step, so that when writing this object pixel memory of data at present and having expired, be used for choosing next memory of the residual pixel that writes these object pixel data:
If the form of this joint photographic experts group image is 420 or 422V, and three memories of this first group of memory are non-for filling up two, then use this first memory selection rule to determine this next memory;
If the form of this joint photographic experts group image is 420, and three memories of this first group of memory have filled up two, then use this second memory selection rule to determine this next memory; And
If the form of this joint photographic experts group image is 422H, 444 or 411, then use this second memory selection rule to determine this next memory.
8. the output buffer method of the pixel data of joint photographic experts group image according to claim 6, it is characterized in that, when if object pixel data of this memory module of input are the color difference components of this scale adjusted MEU, then determine this second memory selection rule to be this storage rule, so that when writing this object pixel memory of data at present and having expired, be used for choosing next memory of the residual pixel that writes these object pixel data.
9. the output buffer method of the pixel data of joint photographic experts group image according to claim 6, it is characterized in that, if this minimum code unit is handled without the ratio adjustment, then determine this second memory selection rule to be this storage rule, so that an object pixel memory of data that writes this minimum code unit at present when having expired, is used for choosing next memory of the residual pixel that writes these object pixel data.
10. the output buffer method of the pixel data of joint photographic experts group image according to claim 1 is characterized in that, this pixel data is more comprised by the step that this memory module exports this frame buffer to:
Be basis for the output mode under the situation of this scale adjusted MEU:
When the form of this joint photographic experts group image is 420 or during 422V, adopting 8 byte running fire output modes is this output mode; And
When the form of this joint photographic experts group image is 444,411, during 422H, adopting 16 byte running fire output modes is this output mode; And
Under the situation that is the minimum code unit handled without the ratio adjustment, determine that then this 16 byte running fire output mode is this output mode.
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| US6563535B1 (en) * | 1998-05-19 | 2003-05-13 | Flashpoint Technology, Inc. | Image processing system for high performance digital imaging devices |
| CN1734498A (en) * | 2004-08-10 | 2006-02-15 | 奥林巴斯株式会社 | Image processing apparatus |
| CN1764229A (en) * | 2004-10-20 | 2006-04-26 | 奥林巴斯株式会社 | Image processing apparatus |
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