CN104581175A - Image processing device and method - Google Patents
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Abstract
The invention discloses an image processing device and method, used for converting original image data to target image data. The image processing device comprises a static random access memory, an image zooming circuit and a video coding circuit, wherein zoomed image data is generated according to the original image data, and the zoomed image data is stored in the static random access memory; the zoomed image data is read from the static random access memory and coded to produce the target image data by the video coding circuit; the target image data is mapped to an image picture, part of the target image data is internal frame data coded in an interval frame compressing mode, and the other part of the target image data is predicted frame data coded in a predicted frame compressing mode.
Description
Technical field
The invention relates to image processor and method, especially about the image processor and the method that utilize Wireless Display (wireless display, WiDi) technology.
Background technology
Refer to Fig. 1, it is the schematic diagram of known image display system.Image display system 10 comprises dynamic random access memory (Dynamic Random Access Memory, DRAM) 110, image processor 120 and display 130.Image processor 120 comprises image-zooming (scaling) circuit 122 and image process unit 124.Dynamic random access memory 110 stores pending image data.Image-zooming circuit 122 reads image data from memory 110, image data carried out liter sampling (up-sampling) or fall the convergent-divergent process such as sampling (down-sampling), after image process unit 124 pairs of image datas carry out the process such as release of an interleave computing (de-interlace) afterwards, then export to display 130 and show.
Refer to Fig. 2, it is the known schematic diagram utilizing the image display system of Wireless Display technology.Image display system 20 comprises dynamic random access memory 210 and 230, image processor 220 and display device 240.Image processor 220 comprises image-zooming circuit 222 and multiple format video coding circuit (multi-format video encoder, MFE) 226.The image data being stored in dynamic random access memory 210, after the process of image-zooming circuit 222, is stored back dynamic random access memory 210.Image data reads from dynamic random access memory 210 by multiple format video coding circuit 226 more subsequently, and after being encoded by image data, is stored to dynamic random access memory 230.External display device 240, such as mobile phone, computer, TV etc., can obtain the data in dynamic random access memory 230 through wireless network (Wi-Fi) and play.
The shortcoming of above-mentioned image processor 220 is, the data that image-zooming circuit 222 processes must first deposit back dynamic random access memory 210, and when multiplexed format video coding circuit 226 needs data, then read from dynamic random access memory 210.Generally speaking, video data is usually comparatively huge, and when especially the resolution of display device 240 support is higher, the data volume of video data is just more considerable.During processing video data, image-zooming circuit 222 pairs of dynamic random access memory 210 once read and write-once, and multiplexed format video coding circuit 226 also once must read same dynamic random access memory 210.When the video data volume increases, actions of these read-writes will take very large memory band width, and if memory speed fast not, be easy to the delay causing signal.Concerning Wireless Display technology, it is considerable key that the instant and image of smoothness is play, and long delay can cause not good user's experience.
Summary of the invention
In view of the deficiency of prior art, an object of the present invention is to provide a kind of image processor and a kind of image treatment method, to promote the usefulness of image processing, meets the demand of the instantaneous transmission of Wireless Display.
Present invention is disclosed a kind of image processor, be used for a raw video data transaction to become target image data, comprise: a static RAM; One image-zooming circuit, couples this static RAM, produces image data after a convergent-divergent according to these raw video data, and by image data after this convergent-divergent stored in this static RAM; And a video coding circuit, couple this static RAM, image data after this static RAM reads this convergent-divergent also carries out encoding to produce this target image data; Wherein, these target image data correspond to an image frame, and the part of these target image data is the interior view frame data through interior view frame compress mode coding, and another part of these target image data is the prognostic chart frame data through prognostic chart frame coding mode coding.
The present invention separately discloses a kind of image treatment method, is used for a raw video data transaction to become target image data, comprises: produce image data after a convergent-divergent according to these raw video data; By image data after this convergent-divergent stored in a static RAM; Image data after this static RAM reads this convergent-divergent; And encode to produce this target image data to image data after this convergent-divergent; Wherein, these target image data correspond to an image frame, and the part of these target image data is the interior view frame data through interior view frame compress mode coding, and another part of these target image data is the prognostic chart frame data through prognostic chart frame compress mode coding.
Image processor of the present invention and method use the static RAM of image processor inside to replace outside dynamic random access memory, to reduce the number of times of access dynamic random access memory.Compared to known technology, operating speed of the present invention static RAM faster, therefore image processor is more suitable for and requires very high Wireless Display technology to the reaction time of system.
Feature for the present invention, implementation and effect, hereby coordinate accompanying drawing to be described in detail as follows do preferred embodiment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of known image display system;
Fig. 2 is the known schematic diagram utilizing the image display system of Wireless Display technology;
Fig. 3 is the image display system utilizing image processor of the present invention;
Fig. 4 is the storage area of the static RAM of image processor of the present invention and the graph of a relation of image data;
Fig. 5 is the graph of a relation of the storage area of the static RAM of image processor of the present invention and the image data of Wireless Display; And
Fig. 6 is the flow chart of an embodiment of image treatment method of the present invention.
Symbol description
10,20,30 image display systems
110,210,230,310,330 dynamic random access memory
120,220,320 image processors
122,222,322 image-zooming circuit
124 image process units
130 displays
226,326 multiple format video coding circuits
240,340 display devices
324 static RAMs
328 control units
S610 ~ S650 step
Embodiment
The idiom of technical terms reference the art of following description, as this specification is illustrated part term or defines, the explanation of this part term is as the criterion with the explanation of this specification or definition.
Disclosure of the present invention comprises image processor and method, can promote the reaction time of the image system utilizing Wireless Display technology.These apparatus and method can be applicable to such as Wireless Display technology etc. and require very high image system to the reaction time, be embodied as under possible prerequisite, the art has knows that the knowledgeable can select the element of equivalence or step to realize the present invention according to the disclosure of this specification usually, that is enforcement of the present invention be not limited to after the embodiment chatted.The subelement comprised due to image processor of the present invention may be separately well known elements, therefore under the prerequisite of the abundant exposure and exploitativeness that do not affect the invention of this device, below illustrates that the details for well known elements will give memorandum.In addition, image treatment method of the present invention can perform by image processor of the present invention or its equivalent device, under the prerequisite of the abundant announcement and exploitativeness that do not affect the method invention, the explanation of following methods invention will focus on step content and non-hardware.
Refer to Fig. 3, it utilizes the image display system 30 of image processor of the present invention.Image display system 30 comprises dynamic random access memory 310 and 330, image processor 320 and display device 340.Image processor 320 comprises image-zooming circuit 322, static RAM (static random access memory, SRAM) 324, multiple format video coding circuit 326 and control unit 328.Image-zooming circuit 322 reads image data from the dynamic random access memory 310 coupled with it, image data to be carried out liter sampling or falls the convergent-divergent process such as sampling, then by the image data after processing stored in static RAM 324.Afterwards, multiple format video coding circuit 326 reads image data again from static RAM 324, and image data is encoded into the bit element flow data of the specification meeting Wireless Display, again by bit element flow data storing to dynamic random access memory 330, last display device 340 obtains image data through wireless network and plays.Control unit 328 couples image-zooming circuit 322 and multiple format video coding circuit 326.When image-zooming circuit 322 by the partial data needed for multiple format video coding circuit 326 stored in static RAM 324 after, just send notification signal to control unit 328, control unit 328 controls multiple format video coding circuit 326 according to notification signal again and reads ready data from static RAM 324.
Refer to Fig. 4, it is the storage area of the static RAM of image processor of the present invention and the graph of a relation of image data.The each handled image data of multiple format video coding circuit 326 is generally a part for a figure frame (frame) 410, and is often in units of a block MB.Such as, in Fig. 4, figure frame 410 is just divided into (n+1) individual section, and block MB0 ~ MBn corresponds to a section respectively.Each block comprises k x k pixel (k is positive integer), and the data that therefore each block comprises are all a part for the data of affiliated k bar pixel line (pixel line).Corresponding diagram frame 410, a memory block (Buffer 0) of static RAM 324 also comprises block MB0 ~ MBn, and that is memory block at least stores the data of k bar pixel line.
Image data is accessed the mode that a pixel line accesses next pixel line again to carry out stored in the mode of static RAM 324 by image-zooming circuit 322, after having stored k bar pixel line, namely a memory block is filled, now block MB0 ~ MBn just can be complete, that is, after a memory block is filled with image data, multiple format video coding circuit 326 could start action.Therefore the give notice time point of signal of image-zooming circuit 322 pairs of control units 328 is and fills up a memory block, such as Buffer0, multiple format video coding circuit 326 sequentially reads the data of block MB0 ~ MBn again from memory block Buffer0 according to the notice of control unit 328, and now image-zooming circuit 322 can from kth+1 pixel line, by the data that processed stored in memory block Buffer1, after device block Buffer1 to be stored is filled, image-zooming circuit 322 pairs of control units 328 signal of giving notice makes multiple format video coding circuit 326 read the data of memory block Buffer1, and image-zooming circuit 322 starts 2k+1 article of pixel line and subsequent writing data into memory block Buffer0.Image-zooming circuit 322 and multiple format video coding circuit 326 just access two memory blocks of static RAM 324 in an alternating fashion.If without the need to saving hardware, memory block Buffer0 and Buffer1 all can be larger; If save hardware, static RAM 324 only can comprise a memory block, and when data are write static RAM 324 by image-zooming circuit 322, multiple format video coding circuit 326 just suspends action; And when multiple format video coding circuit 326 reads data from static RAM 324, image-zooming circuit 322 just suspends action.The size of static RAM 324 of the present invention must be at least the size of a memory block, namely at least must store the data of k bar pixel line.
Generally speaking image data often can utilize the mode of interior view frame (intra frame, I-frame) and prognostic chart frame (predicted frame, P-frame) to transmit, with the minimizing data volume of appropriateness.Interior view frame comprises the data volume of a whole complete graph frame usually, and the data volume of prognostic chart frame is then less comparatively speaking.Wherein, the compress mode producing interior view frame is called interior view frame compress mode, and the compress mode producing prognostic chart frame is called prognostic chart frame compress mode.In order to avoid the unexpected increase of data volume in transmitting procedure can be caused during interior view frame that transmitted data amount is large and affect the stability of transmission, when compressing a certain figure frame, a part of figure frame data of this figure frame are carried out compressing to produce interior view frame data with aforementioned interior view frame compress mode, and another part figure frame data of this figure frame are carried out compressing to produce prognostic chart frame data with aforementioned prognostic chart frame compress mode, and interior view frame data are combined with prognostic chart frame data again, form a complete compression figure frame.Thus, a complete compression figure frame can be made up of interior view frame data and prognostic chart frame data, and the some interior view frame data amounts in transmitting procedure that solve are large especially and affect the problem of transmission stability.Note that aforesaid interior view frame data and prognostic chart frame data are only compressed by the partial data of a figure frame to form respectively, not known interior view frame and prognostic chart frame.In other words, general known technology is selected to carry out compressing to produce interior view frame or prognostic chart frame with interior view frame compress mode or with prognostic chart frame compress mode by a complete graph frame, but be that the part of a complete graph frame is carried out compressing to produce interior view frame data with aforementioned interior view frame compress mode in the present embodiment, and another part of this figure frame is carried out compressing to produce prognostic chart frame data with aforementioned prognostic chart frame compress mode, finally just interior view frame data and prognostic chart frame data are combined into the complete compression figure frame of this figure frame.Refer to Fig. 5, it is the graph of a relation of the storage area of the static RAM of image processor of the present invention and the image data of Wireless Display.Figure frame 510 comprises and prepares to carry out with interior view frame compress mode the partial graph frame data I that compresses, and prepares to carry out with prognostic chart frame compress mode the partial graph frame data P that compresses.Image-zooming circuit 322 from top to bottom sequentially processes the data of figure frame 510, and by the data storing that is disposed to static RAM 324, finally by multiple format video coding circuit 326 in static RAM 324 by the digital independent that is disposed out, and stored in dynamic random access memory 330 after being encoded into interior view frame data or prognostic chart frame data according to this.Therefore according to the present embodiment, at certain time point, when image-zooming circuit 322 be disposed part figure frame data I total data and prepare the data of start processing unit component frame data P time, the data that one of them memory block of static RAM 324 stores part figure frame data I read for multiple format video coding circuit 326, and another memory block then starts the data storing part figure frame data P.Afterwards, at another time point, when the memory block of the data of above-mentioned storage part figure frame data P is filled with, multiple format video coding circuit 326 just reads the data of part figure frame data P from this memory block and compresses with prognostic chart frame compress mode, to be encoded to this prognostic chart frame data.Therefore the design of two memory blocks, can make the signal of video signal that image processor 320 of the present invention is more suitable for for the treatment of meeting Wireless Display specification.
Refer to Fig. 6, it is the flow chart of an embodiment of image treatment method of the present invention.Except aforesaid image processor, the present invention also discloses a kind of image treatment method accordingly, is applied to and uses the image display system of Wireless Display, can the process of expedited data, to meet the demand of Wireless Display technology to instant transfer of data.This method is by front taking off image processor 320 or its equivalent device performs.As shown in Figure 6, one embodiment of the invention comprise the following step:
Step S610: liter sampling is carried out to raw video data or falls sampling to produce the image data after convergent-divergent.Generally speaking, because the resolution of the panel of display device is different, so first convergent-divergent process must be carried out to raw video data, enable the image data after convergent-divergent meet the resolution of display device;
Step S620: by the image data after convergent-divergent stored in static RAM.Image data after convergent-divergent writes static RAM in the mode having accessed a pixel line and access next pixel line again;
Step S630: after the total data of k bar pixel line is stored into static RAM, signal of giving notice.Need in wireless display system to process image in units of a block, if and a block comprises k x k pixel (k is positive integer), then the data that static RAM at least must deposit k bar pixel line could produce at least one complete block.Therefore, after static RAM is filled with k bar pixel line, signal of just giving notice, to notify that next step starts to carry out;
Step S640: start to read the image data after convergent-divergent from static RAM according to notification signal.This step, in units of the block comprising k x k pixel, reads data from static RAM, as shown in Figure 4, namely reads the partial data of each pixel line in k bar pixel line at every turn.Note that this step can be first have read k bar pixel line after, only utilize the partial data of wherein each pixel line; Also by the mode of directly specifying load position, the partial data of each pixel line in k bar pixel line can only be read.In addition, when static RAM comprises two memory blocks (memory block at least stores the data of k bar pixel line), this step can read data from first memory block, and the data be disposed can be write second memory block by step S620 simultaneously.Therefore step S620 ~ S640 facility mode alternately writing and read memory block is carried out.But static RAM only can also comprise a memory block, now step S620 and step S640 just cannot carry out simultaneously; And
Step S650: encode to the image data after convergent-divergent, to produce target image data.The image transmission form of the target image data fit Wireless Display technology after coding, therefore can through wireless network transmissions to display device.
In order to be more conducive to the transmission of data, the data volume of interior view frame reduces by Wireless Display technology, and a complete compression figure frame may comprise interior view frame data and prognostic chart frame data simultaneously.Moreover, when static RAM comprises two memory blocks, refer to Fig. 5, at certain time point, the step S620 simultaneously carried out and step S640 will prepare data one of them memory block stored in static RAM carrying out the partial graph frame data P compressed with prognostic chart frame compress mode respectively, and reads the data preparing to carry out the partial graph frame data I compressed with interior view frame compress mode from another memory block; Afterwards, at another time point, when the memory block of the data of above-mentioned storage part figure frame data P is filled with, step S640 just reads the data of part figure frame data P from this memory block and compresses with prognostic chart frame compress mode, to be encoded to this prognostic chart frame data.Therefore the design of two memory blocks, can make the signal of video signal that image treatment method of the present invention is more suitable for for the treatment of meeting Wireless Display specification.
Usually know that the disclosure that the knowledgeable can invent by the device of Fig. 3 coordinates the explanation of the memory storage mode of Fig. 4 and Fig. 5 to understand method working of an invention details and the change of Fig. 6 because the art has, therefore, for avoiding superfluous literary composition, under the prerequisite of the announcement requirement and exploitativeness that do not affect the method invention, the explanation of repetition gives memorandum at this.Take off before note that in diagram, the order etc. of the shape of element, size, ratio and step is only signal, has and usually knows that the knowledgeable understands the present invention, be not used to limit the present invention for the art.In addition, the art personage Ke Yi disclosure of the present invention and the demand of self optionally implement the part or all of technical characteristic of any embodiment, or optionally implement the combination of the part or all of technical characteristic of multiple embodiment, increase elasticity during the invention process by this.Moreover though take off embodiment front for Wireless Display technology, so this is not limitation of the present invention, and the art personage Ke Yi announcement of the present invention suitably applies the present invention to the image processor of other type.
Although embodiments of the invention are described above; but those embodiments are not used for limiting the present invention; the art has knows that the knowledgeable can impose change according to the content expressed or imply of the present invention to technical characteristic of the present invention usually; all this kind changes the patent protection category that all may belong to sought by the present invention; in other words, scope of patent protection of the present invention is defined by claims and is as the criterion.
Claims (14)
1. an image processor, is used for a raw video data transaction to become target image data, comprises:
One static RAM;
One image-zooming circuit, produces image data after a convergent-divergent according to these raw video data, and by image data after this convergent-divergent stored in this static RAM; And
One video coding circuit, image data after this static RAM reads this convergent-divergent also carries out encoding to produce this target image data;
Wherein, these target image data correspond to an image frame, and the part of these target image data is the interior view frame data through interior view frame compress mode coding, and another part of these target image data is the prognostic chart frame data through prognostic chart frame compress mode coding.
2. image processor as claimed in claim 1, is characterized in that, also comprise:
One control unit, couples this image-zooming circuit and this video coding circuit;
Wherein, this image-zooming circuit is in order to send a notification signal to this control unit, and this control unit controls this video coding circuit according to this notification signal starts to encode.
3. image processor as claimed in claim 1, it is characterized in that, after this convergent-divergent, image data comprises the K bar pixel line of this image frame, this video coding circuit reads the partial data of each pixel line in this K bar pixel line to encode from this static RAM, and K is positive integer.
4. image processor as claimed in claim 3, it is characterized in that, the size of this static RAM equals the data volume of this K bar pixel line.
5. image processor as claimed in claim 3, it is characterized in that, this static RAM comprises a first memory block and a second memory block, and when this image-zooming circuit accesses this first memory block, this video coding circuit accesses this second memory block simultaneously.
6. image processor as claimed in claim 5, it is characterized in that, the size of this first and second memory block equals the data volume of this K bar pixel line.
7. image processor as claimed in claim 5, it is characterized in that, in a very first time point, this video coding circuit reads the data of storage in this second memory block to be encoded to this interior view frame data, and image data after this convergent-divergent reads in one second time point to be encoded to this prognostic chart frame data for this video coding circuit stored in this first memory block by this image-zooming circuit simultaneously.
8. an image treatment method, is used for a raw video data transaction to become target image data, comprises:
Image data after a convergent-divergent is produced according to these raw video data;
By image data after this convergent-divergent stored in a static RAM;
Image data after this static RAM reads this convergent-divergent; And
Encode to produce this target image data to image data after this convergent-divergent;
Wherein, these target image data correspond to an image frame, and the part of these target image data is the interior view frame data through interior view frame compress mode coding, and another part of these target image data is the prognostic chart frame data through prognostic chart frame compress mode coding.
9. image treatment method as claimed in claim 8, is characterized in that, also comprise:
When after this convergent-divergent, image data is stored into this static RAM, send a notification signal;
Wherein, should the step of image data start according to this notification signal to perform after this static RAM reads this convergent-divergent.
10. image treatment method as claimed in claim 8, it is characterized in that, after this convergent-divergent, image data comprises the K bar pixel line of this image frame, after this static RAM reads this convergent-divergent, the step of image data should read the partial data of each pixel line in this K bar pixel line to encode from this static RAM, K is positive integer.
11. image treatment methods as claimed in claim 10, is characterized in that, the size of this static RAM equals the data volume of this K bar pixel line.
12. image treatment methods as claimed in claim 10, it is characterized in that, this static RAM comprises a first memory block and a second memory block, and when this first memory block of step accesses stored in this static RAM of image data after this is by this convergent-divergent, after this static RAM reads this convergent-divergent, step of image data should access this second memory block simultaneously.
13. image treatment methods as claimed in claim 12, is characterized in that, the size of this first and second memory block equals the data volume of this K bar pixel line.
14. image treatment methods as claimed in claim 12, it is characterized in that, this image treatment method also comprises:
Read in this second memory block the data that store to be encoded to this interior view frame data in a very first time point, simultaneously by image data after this convergent-divergent stored in this first memory block; And
Image data is read after this convergent-divergent stored in this first memory block to be encoded to this prognostic chart frame data in one second time point.
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Effective date of registration: 20200414 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: Taiwan Hsinchu County Tai Yuan Street China jhubei City, No. 26 4 floor 1 Patentee before: MStar Semiconductor, Inc. |