CN102045531A - Realization method for deinterlaced video display of mobile terminal - Google Patents
Realization method for deinterlaced video display of mobile terminal Download PDFInfo
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Abstract
The invention provides a realization method for the deinterlaced video display of a mobile terminal, comprising the following steps: 1. configuring information to a configurator by a CPU (central processing unit); 2. reading data from a storage unit according to configured information by a bus reading unit; if data belong to the current field, directly transmitting the data to an image cache unit; if the data belong to a front field or a rear field, simultaneously transmitting the data to the image cache unit and a motion judgement unit; 3. carrying out motion judgement on each point of a generated line by the motion judgement unit, and transmitting the judgement result to an interpolation computing unit; 4. according to the judgement result, computing the interpolation point of the generated line by the interpolation computing unit, and writing the generated line into the image cache unit; and 5. reading data from the image cache unit by a screen display controller, and transmitting the data to a screen for display. The invention can carry out tight coupling on the deinterlacing with the screen display controller and guarantees good display effect.
Description
[technical field]
The present invention relates to a kind of field of mobile terminal video display structure.
[background technology]
Deinterleave (deinterlace) is a kind of method that a kind of video source with interlacing scan (interlace) is converted to the video format of line by line scan (progressive).Because traditional display device is under the restriction of bandwidth, much be to use interleaved display mode, so the form that the partial video source is arranged is in order to adapt to this display device, the strange row and the idol row of image are separately become alternately storage of two fields (field), make things convenient for display device mixed sweep composing images, but current a lot of novel display device as LCD etc., has adopted the scanning form of lining by line scan.So how the video source with interlacing shows on display device line by line, and to obtain good effect be highly significant.If handle badly, interlaced video is easy to occur flicker or phenomenon such as fuzzy when showing above the display device line by line.
Usually have on the method for existing deinterleave, from the memory cell sense data, after deinterleave calculated, retrography returned memory by software, and speed is very slow and consume very much the calculation resources of CPU like this, and takies massive band width; Perhaps use special deinterleave chip or image processor (GPU) to come deinterleave, such speed is very fast, but still needs sense data, and after the computing, retrography returns memory, takies massive band width, and cost is very high when realizing.
From algorithm, current handheld device is because the real-time requirement that shows, and effective deinterlace algorithm requires very high reason to bandwidth and arithmetic speed, generally all is to adopt simple algorithm such as simple single game filtering to carry out computing, causes display effect very poor.
[summary of the invention]
The technical problem to be solved in the present invention is to provide a kind of implementation method of deinterleave of portable terminal, and it can carry out close coupling with deinterleave and screen display controller, and has guaranteed good display effect.
The present invention is achieved in that
The implementation method of the deinterleave of a kind of portable terminal of the present invention comprises the steps:
Step 10, CPU are configured information to configurator, and described information comprises: the size of video, the address when the front court, the address of front court, the address of back court, motion determination threshold value;
Step 20, bus reading unit from the memory cell reading of data, if data are worked as the front court, then directly are transferred to the image buffer storage unit according to above-mentioned configuration information, if front court or back court, then be transferred to image buffer storage unit and motion determination unit simultaneously;
Step 30, motion determination unit carry out motion determination to generating each capable point, and judged result is transferred to the interpolation arithmetic unit;
Step 40, interpolation arithmetic unit calculate and generate capable interpolation point according to above-mentioned judged result, and will generate the capable image buffer storage unit of writing;
Step 50, screen display controller are from the image buffer storage unit reads data, and form on request is transported to screen display.
Further, in the described step 30, the judgement flow process of described motion determination unit comprises the steps: to read in the arbitrary scope in generation point that generates capable correspondence position in front court, the back court and 0 to 5 point that generates the some front and back position; Carry out the absolute difference computing of the corresponding points of front court and back court opposite position simultaneously; The absolute difference and the motion determination threshold value of each corresponding points are compared, if absolute difference less than the motion determination threshold value this pixel be partial to static, if greater than the motion determination threshold value, then this pixel be partial to the motion; When the generation point that reads in and the motion determination of being had a few that generates the some front and back position all be static, it is static that this generations point is only, this generates judged result export after, continuation is carried out motion determination to next one point.
Further, the arbitrary scope in 0 of described generation point front and back position to 5 points is the best with preceding two points and latter two point that generates the some position specifically.
Further, in the described step 40, when calculate generating the interpolation point of row, use be in the front court, generate the some position up and down and in the front court at the point of a generation correspondence position, and calculate according to the motion determination result.
Further, in the described step 40, when calculating generated the interpolation point of row, if calculate the generation point of motion, the weights when the front court during with the calculating interpolation were provided with greatly more, and flicker level is more little; If calculate static generation point, the weights of the front court during with the calculating interpolation are provided with greatly more, and amount of information and definition improve big more.
Further, in the described step 40, the flow process of described interpolation calculation specifically comprises as follows: if work as the front court is strange row, and row transmission is for the first time gone when first of front court, is stored in first row cache of image buffer storage unit; Second row of the front court of row transmission for the second time is stored in second row cache and the 4th row cache; Second row of the back court of row transmission for the third time reads second front court second row in the row cache simultaneously and carries out motion determination to the motion determination unit to the motion determination unit, judged result is stored in the buffer of motion determination unit; The 4th row transmission is when front court the third line, be stored in the 3rd row cache, reading the 4th front court second row in the row cache simultaneously goes with the front court first of working as in first row cache, the front court the third line of working as with the 4th row transmission is sent to interpolation arithmetic unit participation interpolation arithmetic, again according to the judged result of buffer, finish interpolation calculation, interpolation result is write second row cache; Calculate when finishing, data in first row cache and second row cache become effectively, can be read out use, in the 3rd row cache storage this calculate the data of first row that the third line promptly calculates next time, be used to participate in the next calculating that generates row, the 4th row cache is released; Aforementioned calculation constantly circulation is finished dealing with up to all row of image.
Further, in the described step 40, the flow process of described interpolation calculation specifically comprises as follows: if work as the front court is even row, and then first row generates the data that the data of going are directly duplicated front court first row, row transmission for the first time is stored in first row cache when second row of front court; The third line of the front court of row transmission for the second time is stored in second row cache and the 4th row cache; The third line of the back court of row transmission for the third time reads second front court the third line in the row cache simultaneously and carries out the estimation judgement to motion determination unit and back court the third line to the motion determination unit, and judged result is stored in motion determination result cache device; The 4th row transmission is when the front court fourth line, be stored in the 3rd row cache, read going in the 4th front court the third line in the row cache and first row cache simultaneously when front court second, when being sent to the interpolation arithmetic unit, the front court fourth line participates in interpolation arithmetic with the 4th row transmission, again according to the judged result of motion determination result cache device, finish interpolation calculation, and interpolation result is write second row cache; When calculate finishing, the data in first row cache and second row cache become effectively, can be read out use, in the 3rd row cache storage this calculate the data of the third line, be used to participate in the next calculating of going that generates, the 4th row cache is released; Aforementioned calculation constantly circulation is finished dealing with up to all row of image.
The present invention has following advantage:
1. the present invention carries out close coupling with deinterleave and screen display controller, be that motion determination unit and interpolation arithmetic unit and image buffer storage unit are coupled, do not need data are read and carry out being written back to memory again after deinterleave calculates, but directly the image of handling is sent to screen display controller by the image buffer storage unit is transferred to screen display again, has significantly reduced the bus bandwidth loss;
2. adopt the inter prediction method on the algorithm that the present invention uses, guaranteed good display effect;
3. the present invention is carrying out when motion determination calculates, and employed motion determination threshold value can freely dispose, and makes the user can be at the effect of different video type adjustment demonstrations;
4. the present invention not merely only is to use the generation point to carry out motion determination, and has been to use multi-point joint to carry out motion determination when carrying out motion determination calculating, has reduced the high frequency noise.
[description of drawings]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the electrical block diagram of the inventive method.
Fig. 2 is a schematic diagram of the inter prediction method of the present invention's employing.
The schematic diagram of Fig. 3 the time for motion determination of the present invention.
Fig. 4 is the schematic diagram of interpolation arithmetic of the present invention when the front court is strange row.
Fig. 5 is the schematic diagram of interpolation arithmetic of the present invention when the front court is the idol row
[embodiment]
See also Fig. 1 to shown in Figure 5, embodiments of the invention are described in detail.
As Fig. 1, the inventive method realizes the structure chart of circuit, it comprises bus and is connected in CPU, memory cell, configuration register, bus reading unit on the bus, also comprises motion determination unit, interpolation arithmetic unit, image buffer storage unit, screen display controller, screen; Described config memory is connected respectively to bus reading unit and motion determination unit, described bus reading unit is connected respectively to motion determination unit and image buffer storage unit, and described motion determination unit connects interpolation arithmetic unit, image buffer storage unit, screen display controller, screen successively.Wherein said memory cell is responsible for storing the video initial data of interlaced format; Described bus reading unit is responsible for by bus from the memory cell reading video data, and data are sent to motion determination unit and image buffer storage unit; The image that will be shown to screen is responsible for storing in described image buffer storage unit; Described indicative control unit is responsible for amplifying the picture size of dwindling in the buffer memory, makes it to adapt to the size of screen, and exports to screen according to form and sequential transmit image data that screen needs; Described CPU is responsible for the sequencing control of entire system and register is configured; Described configuration register is responsible for storing all information of whole deinterleave process need, size as video, address when the front court, the address of front court, (video is made of a consecutive image sequence exactly in the address of back court, in the sequence of video images of interleaved code, every width of cloth image is called as one, because video image is a sequential sequence, so supposing to carry out the field of deinterleave computing is called as and works as the front court, then be called as preceding field picture at one image before the front court in the video sequence, the image that is in after the front court one in video sequence is called as the back field picture), the motion determination threshold value, or the like, the user uses CPU by bus the value in the register to be configured; Described motion determination unit is responsible for that each is generated each point of going and is carried out motion determination, and the result that will judge passes to interpolation arithmetic unit participation interpolation arithmetic; The result according to motion determination is responsible in described interpolation arithmetic unit, calculates the interpolation point that is generating the point on the point coordinates when point up and down that generates the some position in the front court and preceding reference field.
It comprises the steps: that specifically 10.CPU is configured information to configurator, described information comprises: the size of video, when the address of the address of the address of front court, front court, back court, motion determination threshold value 20. bus reading units according to above-mentioned configuration information from the memory cell reading of data, if data are worked as the front court, then directly be transferred to the image buffer storage unit, if front court or back court, then be transferred to image buffer storage unit and motion determination unit simultaneously; 30. the motion determination unit carries out motion determination to generating each capable point, and judged result is transferred to the interpolation arithmetic unit; 40. the interpolation arithmetic unit according to above-mentioned judged result, calculates and generates capable interpolation point, and will generate the capable image buffer storage unit of writing; 50. screen display controller is from the image buffer storage unit reads data, and form on request is transported to screen display.
As Fig. 2, the present invention has adopted the inter prediction method, and its flow process is as follows:
1. if working as the front court is strange row, then all strange row of delta frame adopt the original value when the front court, and all idols are gone as generating row; If working as the front court is even row, then all idol row of delta frame adopt the original value when the front court, and an odd row is as generating row;
2. when calculating the generation row, by the comparison of front court, back court corresponding pixel points, calculate difference, judging each pixel according to the motion determination threshold value is motion or static;
3. during interpolation arithmetic, calculating what generate that point uses is the point on the point coordinates of generating in point up and down that generates the some position in the front court and preceding reference field, and calculates according to the result of motion determination;
4. according to the motion determination result, when interpolation calculation generated point, if what calculate is the generation point of motion, the weights when the front court when calculating interpolation can be bigger, glimmers avoiding; If what calculate is static generation point, the weights of the front court when calculating interpolation can be bigger, to improve amount of information and definition.
As Fig. 3, the flow process that the motion determination unit among the present invention carries out motion determination is as follows:
31. because every the parity in interlaced video source is alternatively distributed, so the position of field, front and back just in time is corresponding position of working as the generation row of front court. need read in the pixel such as the pixel among the figure 5 of generation row correspondence position in the field, front and back, but also to read in an arbitrary scope of 0 to 5 point of front and back, position that generates, here each two point before and after getting, as pixel 3, pixel 4 and pixel 6, pixel 7, carry out the absolute difference computing of corresponding points simultaneously by pixel absolute difference arithmetic unit, carry out the absolute difference computing as the pixel 3 of front court and the pixel 3 of back court;
32. compare by the absolute difference of motion determination arithmetic unit with user configured motion determination threshold value and each corresponding points, if the absolute difference of corresponding points less than the motion determination threshold value illustrate this point be partial to static, if greater than the motion determination threshold value would illustrate this point be partial to the motion;
33. when the motion determination of being had a few that read in generation point and front and back all was rest point, it is static that the motion determination of this generation point is only, otherwise be judged as motion, the purpose of doing like this is the appearance for fear of some high frequency points;
34. after this generates the judged result output of point, continue next one point is carried out motion determination.
As Fig. 4, the buffer of every row in the image buffer storage unit in the row cache corresponding diagram 1 among the figure; Motion determination unit in the motion determination unit corresponding diagram 1; Motion determination result cache device is responsible for storing the motion determination result who generates every of row; Interpolation arithmetic unit in the interpolation arithmetic unit corresponding diagram 1.
Each calculate one generate the provisional capital need before and after correspondence generate each delegation of line position and in the front court, generate two row pixels of row upper-lower position, need read in four lines altogether; Each calculating after first time estimation interpolation calculation owing to required deposit in once calculating last when front court first row, does not need to read in, so calculating of all row except the generation row of first row all only need be read in triplex row again.
To be strange behavior example when the front court, the interpolation arithmetic flow process is as follows:
411. row transmission for the first time is stored in first row cache when first row of front court;
421. second row of the front court of row transmission for the second time is stored in second row cache and the 4th row cache;
431. second of the row transmission back court row is to the motion determination unit for the third time, reads second front court second row in the row cache simultaneously and goes with back court second to the motion determination unit and carry out the estimation judgement, and judged result is stored in motion determination result cache device;
441. the 4th row transmission is when front court the third line, be stored in the 3rd row cache (being used for the next calculating that generates row), reading the 4th front court second row in the row cache simultaneously goes with the front court first of working as in first row cache, the front court the third line of working as with the 4th row transmission is sent to interpolation arithmetic unit participation interpolation arithmetic, again according to the judged result of motion determination result cache device, finish interpolation calculation, and interpolation result is write second row cache;
451. calculate when finishing, data in first row cache and second row cache become effectively, can be read out use, store these data of calculating the third line (data of first row that calculates next time) in the 3rd row cache, be used to participate in the next calculating that generates row, the 4th row cache is released; Aforementioned calculation constantly circulation is finished dealing with up to all row of image.
As Fig. 5, be even if work as the front court, then first row generates the data of going and directly duplicates the data of going in front court first, and other operations and strange field are similar:
412. row transmission for the first time is stored in first row cache when second row of front court;
422. the third line of the front court of row transmission for the second time is stored in second row cache and the 4th row cache;
Carry out the estimation judgement 432. the third line of the back court of row transmission for the third time, reads second front court the third line in the row cache simultaneously to the motion determination unit to motion determination unit and back court the third line, judged result is stored in motion determination result cache device;
442. the 4th row transmission is when the front court fourth line, be stored in the 3rd row cache (being used for the next calculating that generates row), read going in the 4th front court the third line in the row cache and first row cache simultaneously when front court second, when being sent to the interpolation arithmetic unit, the front court fourth line participates in interpolation arithmetic with the 4th row transmission, again according to the judged result of motion determination result cache device, finish interpolation calculation, and interpolation result is write second row cache;
452. calculate when finishing, data in first row cache and second row cache become effectively, can be read out use, store these data of calculating the third line (data of first row that calculates next time) in the 3rd row cache, be used to participate in the next calculating that generates row, the 4th row cache is released; Aforementioned calculation constantly circulation is finished dealing with up to all row of image.
The above, only for preferred embodiment of the present invention, so can not limit scope of the invention process according to this, i.e. the equivalence of doing according to claim of the present invention and description changes and modification, all should still belong in the scope that the present invention contains.
Claims (7)
1. the implementation method of the deinterleave video of portable terminal demonstration is characterized in that, specifically comprises the steps:
Step 10, CPU are configured information to configurator, and described information comprises: the size of video, the address when the front court, the address of front court, the address of back court, motion determination threshold value;
Step 20, bus reading unit from the memory cell reading of data, if data are worked as the front court, then directly are transferred to the image buffer storage unit according to above-mentioned configuration information, if front court or back court, then be transferred to image buffer storage unit and motion determination unit simultaneously;
Step 30, motion determination unit carry out motion determination to generating each capable point, and judged result is transferred to the interpolation arithmetic unit;
Step 40, interpolation arithmetic unit calculate and generate capable interpolation point according to above-mentioned judged result, and will generate the capable image buffer storage unit of writing;
Step 50, screen display controller are from the image buffer storage unit reads data, and form on request is transported to screen display.
2. the implementation method that shows of the deinterleave video of a kind of portable terminal according to claim 1, it is characterized in that: in the described step 30, the judgement flow process of described motion determination unit comprises the steps: to read in the arbitrary scope in generation point that generates capable correspondence position in front court, the back court and 0 to 5 point that generates the some front and back position; Carry out the absolute difference computing of the corresponding points of front court and back court opposite position simultaneously; The absolute difference and the motion determination threshold value of each corresponding points are compared, if absolute difference less than the motion determination threshold value this pixel be partial to static, if greater than the motion determination threshold value, then this pixel be partial to the motion; When the generation point that reads in and the motion determination of being had a few that generates the some front and back position all be static, it is static that this generations point is only, this generates judged result export after, continuation is carried out motion determination to next one point.
3. the implementation method that shows of the deinterleave video of a kind of portable terminal according to claim 2, it is characterized in that: the arbitrary scope in 0 to 5 point of described generation point front and back position is the best with preceding two points that generate the some position with latter two point specifically.
4. the implementation method that shows of the deinterleave video of a kind of portable terminal according to claim 1, it is characterized in that: in the described step 40, when calculating the interpolation point that generates row, use be in the front court, generate the some position up and down and in the front court at the point of a generation correspondence position, and calculate according to the motion determination result.
5. the implementation method that shows of the deinterleave video of a kind of portable terminal according to claim 4, it is characterized in that: in the described step 40, when calculating the interpolation point that generates row, if calculate the generation point of motion, the weights when the front court during with the calculating interpolation are provided with greatly more, and flicker level is more little; If calculate static generation point, the weights of the front court during with the calculating interpolation are provided with greatly more, and amount of information and definition improve big more.
6. the implementation method that shows according to the deinterleave video of claim 4 or 5 described a kind of portable terminals, it is characterized in that: in the described step 40, the flow process of described interpolation calculation specifically comprises as follows: if work as the front court is strange row, row transmission for the first time is stored in first row cache of image buffer storage unit when first row of front court; Second row of the front court of row transmission for the second time is stored in second row cache and the 4th row cache; Second row of the back court of row transmission for the third time reads second front court second row in the row cache simultaneously and carries out motion determination to the motion determination unit to the motion determination unit, judged result is stored in the buffer of motion determination unit; The 4th row transmission is when front court the third line, be stored in the 3rd row cache, reading the 4th front court second row in the row cache simultaneously goes with the front court first of working as in first row cache, the front court the third line of working as with the 4th row transmission is sent to interpolation arithmetic unit participation interpolation arithmetic, again according to the judged result of buffer, finish interpolation calculation, interpolation result is write second row cache; Calculate when finishing, data in first row cache and second row cache become effectively, can be read out use, in the 3rd row cache storage this calculate the data of first row that the third line promptly calculates next time, be used to participate in the next calculating that generates row, the 4th row cache is released; Aforementioned calculation constantly circulation is finished dealing with up to all row of image.
7. the implementation method that shows according to the deinterleave video of claim 4 or 5 described a kind of portable terminals, it is characterized in that: in the described step 40, the flow process of described interpolation calculation specifically comprises as follows: if work as the front court is even row, then first row generates the data that the data of going are directly duplicated front court first row, row transmission for the first time is stored in first row cache when second row of front court; The third line of the front court of row transmission for the second time is stored in second row cache and the 4th row cache; The third line of the back court of row transmission for the third time reads second front court the third line in the row cache simultaneously and carries out the estimation judgement to motion determination unit and back court the third line to the motion determination unit, and judged result is stored in motion determination result cache device; The 4th row transmission is when the front court fourth line, be stored in the 3rd row cache, read going in the 4th front court the third line in the row cache and first row cache simultaneously when front court second, when being sent to the interpolation arithmetic unit, the front court fourth line participates in interpolation arithmetic with the 4th row transmission, again according to the judged result of motion determination result cache device, finish interpolation calculation, and interpolation result is write second row cache; When calculate finishing, the data in first row cache and second row cache become effectively, can be read out use, in the 3rd row cache storage this calculate the data of the third line, be used to participate in the next calculating of going that generates, the 4th row cache is released; Aforementioned calculation constantly circulation is finished dealing with up to all row of image.
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Application publication date: 20110504 |