CN105611261A - Projection method and device based on video buffer and projector - Google Patents
Projection method and device based on video buffer and projector Download PDFInfo
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- CN105611261A CN105611261A CN201510994273.7A CN201510994273A CN105611261A CN 105611261 A CN105611261 A CN 105611261A CN 201510994273 A CN201510994273 A CN 201510994273A CN 105611261 A CN105611261 A CN 105611261A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3188—Scale or resolution adjustment
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention discloses a projection method and device based on video buffer and a projector. The method comprises the following steps of obtaining an original video image; buffering the original video image to obtain a target video image; carrying out geometric correction on the target video image; and projecting the video image after geometric correction on a curtain. The method is characterized in that buffering the original video image comprises the steps of dividing the original video image into an odd-numbered line of pixel points and an even-numbered line of pixel points and respectively buffering the odd-numbered line of pixel points and the even-numbered line of pixel points. Through the projection method and device based on the video buffer and the projector, a technical problem of how to save the data transmission bandwidth is at least partially solved.
Description
Technical field
The embodiment of the present invention relates to technical field of video processing, especially relate to a kind of projecting method based on video buffer andDevice and projecting apparatus.
Background technology
In video processing applications, often cushion every frame video with external RAM. Along with video resolution and frame per second notDisconnected increasing, the big or small requirement of the data transfer bandwidth to external RAM memory and memory also increases gradually.
When input video resolution ratio with output video resolution ratio is inconsistent and the curtain of video image institute projection is on-plane surfaceTime, need to dwindle or amplify and process and how much correction process. Dwindling or amplifying and process and how much rectifications placeWhen reason, need to calculate and produce target video image pixel from raw video image pixel.
In the time carrying out image scaling, in some cases, can use multiple raw video image pixels to calculate simultaneously,These raw video image pixels need to be buffered in RAM. Conventionally our buffer memory one frame video image, namely frame is slowPunching. Prior art is used bilinear interpolation algorithm to process video image conventionally.
Bilinear interpolation algorithm is algorithm conventional in Video processing, and its four of use closes on original image vegetarian refreshments and calculates oneTarget pixel points.
For example: expect that unknown function f is in a value of P=(x, y), suppose our known function f Q11=(x1, y1),Q12=(x1, y2), the value of Q21=(x2, y1) and four points of Q22=(x2, y2).
As shown in Figure 1, first carry out linear interpolation in x direction, obtain R1 and R2, then carry out linearity in y directionInterpolation, obtains P. So just obtain desired result f (x, y).
Existing video frame buffer implementation method is:
While carrying out write operation: video data is write to external RAM memory successively, write n capable, need to carry out nThe write operation of inferior row.
While carrying out read operation: video data is read from external RAM memory successively, read n capable, need to carry out nThe read operation of inferior row.
Inventor finds that prior art at least exists following defect realizing in process of the present invention:
The RAM resource that existing video frame buffer implementation method takies is more.
In view of this, special proposition the present invention.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of projecting method based on video buffer, and it is separated at least in partDetermine and how to have saved the technical problem of data transfer bandwidth. In addition, also provide a kind of projection arrangement based on video buffer withAnd projecting apparatus.
To achieve these goals, according to an aspect of the present invention, provide following technical scheme:
Based on a projecting method for video buffer, the method can comprise:
Obtain raw video image;
Cushion described raw video image, obtain target video image;
To described target video image, and carry out geometric correction;
By the projecting video image after described geometric correction to curtain;
Wherein, the described raw video image of described buffering comprises:
Described raw video image is divided into odd-numbered line pixel and even number line pixel, to described odd-numbered line pixel and instituteStating even number line pixel cushions respectively.
According to another aspect of the present invention, also provide a kind of projection arrangement based on video buffer. This device can comprise:
Acquisition module, is configured to obtain raw video image;
Buffer module, is configured to cushion described raw video image, obtains target video image;
Geometric correction module, is configured to described target video image, and carries out geometric correction;
Projection submodule, is configured to the projecting video image after described geometric correction to curtain;
Wherein, described buffer module also comprises:
Buffer sublayer module, is configured to described raw video image to be divided into odd-numbered line pixel and even number line pixel, rightDescribed odd-numbered line pixel and described even number line pixel cushion respectively.
According to a further aspect of the invention, also provide a kind of projecting apparatus, this projecting apparatus comprises above-mentioned based on video bufferProjection arrangement.
Compared with prior art, technique scheme at least has following beneficial effect:
The embodiment of the present invention is by raw video image being divided into odd-numbered line pixel and even number line pixel, to odd-numbered line pictureVegetarian refreshments and even number line pixel cushion respectively, have saved the bandwidth of transfer of data.
Certainly, implement arbitrary product of the present invention and not necessarily need to realize above-described all advantages simultaneously.
Other features and advantages of the present invention will be set forth in the following description, and, partly from description, becomeObviously, or by implementing the present invention understand. Object of the present invention and other advantage can be by the explanations writeIn book, claims and accompanying drawing, specifically noted method realizes and obtains.
Brief description of the drawings
Accompanying drawing, as a part of the present invention, is used to provide further understanding of the invention, schematic reality of the present inventionExecute example and explanation thereof for explaining the present invention, but do not form inappropriate limitation of the present invention. Obviously, attached in the following describesFigure is only some embodiment, to those skilled in the art, do not paying under the prerequisite of creative work,Can also obtain other accompanying drawings according to these accompanying drawings. In the accompanying drawings:
Fig. 1 is according to the bilinear interpolation algorithm principle schematic diagram shown in an exemplary embodiment;
Fig. 2 is according to the schematic flow sheet of the projecting method based on video buffer shown in an exemplary embodiment;
Fig. 3 is according to the applied environment schematic diagram of the embodiment of the present invention projecting method shown in an exemplary embodiment;
Fig. 4 is according to the projection arrangement structural representation based on video buffer shown in an exemplary embodiment;
Fig. 5 is according to the structural representation of the buffer sublayer module shown in an exemplary embodiment;
Fig. 6 is according to the structural representation of the projecting apparatus shown in an exemplary embodiment.
These accompanying drawings and text description are not intended to limit by any way design scope of the present invention, but by reference to spyDetermine embodiment for those skilled in the art illustrate concept of the present invention.
Detailed description of the invention
The technical problem embodiment of the present invention being solved below in conjunction with accompanying drawing and specific embodiment, the technical scheme adoptingAnd the technique effect of realizing carries out clear, complete description. Obviously, described embodiment is only the application'sPart embodiment is not whole embodiment. Based on the embodiment in the application, those of ordinary skill in the art are not payingGo out under the prerequisite of creative work, all other obtaining is equal to or the embodiment of obvious modification all drops on protection of the present inventionIn scope. The embodiment of the present invention can be specialized according to the multitude of different ways limiting in claim and contain.
It should be noted that, in the following description, understand for convenient, provided many details. But very brightAobvious, realization of the present invention can not have these details.
It should be noted that, clearly do not limiting or do not conflict in the situation that, each embodiment in the present invention and whereinTechnical characterictic can mutually combine and form technical scheme.
Fig. 2 is according to the schematic flow sheet of the projecting method based on video buffer shown in an exemplary embodiment. As Fig. 2Shown in, the method can comprise:
Step S100: obtain raw video image.
Step S110: raw video image is divided into odd-numbered line pixel and even number line pixel, to odd-numbered line pixel andEven number line pixel cushions respectively, obtains target video image.
Step S120: to target video image, and carry out geometric correction.
Step S130: by the projecting video image after geometric correction to curtain.
Because raw video image is divided into odd-numbered line pixel and even number line pixel by the present embodiment, to odd-numbered line pixelCushion respectively with even number line pixel, so saved data transfer bandwidth.
In an optional embodiment, odd-numbered line pixel and even number line pixel to raw video image carry out respectivelyBuffering specifically comprises:
The odd-numbered line pixel of raw video image and even number line pixel are stored separately respectively; Read original simultaneouslyOdd-numbered line pixel in video image and even number line pixel.
Wherein, the base unit of video data is pixel, and video data, in the time transmitting, is to come according to level orderTransmitting video image pixel, by row transmission pixel. Particularly, first transmit the first row of the first frame video, soThe second row of rear transmission the first frame video ... until transfer last column of the first frame video. Then transmitting the second frame looksThe first row frequently, the second row of the second frame video ... According to transmission of video principle, can be in raw video imagePixel is processed according to parity rows, and the embodiment of the present invention is by the odd-numbered line pixel of raw video image and even number line pixelPoint is stored separately respectively. The odd-numbered line pixel of raw video image can be stored in a memory, and incite somebody to actionThe even number line pixel of raw video image stores in another memory, thereby realizes the odd-numbered line of raw video imageThe independent storage of pixel and even number line pixel.
In an optional embodiment, read odd-numbered line pixel and even number line pixel in raw video image simultaneously,Can specifically comprise:
Utilize bilinear interpolation algorithm, read odd-numbered line pixel and even number line pixel in raw video image simultaneously.
In an optional embodiment, utilize bilinear interpolation algorithm, read the odd-numbered line in raw video image simultaneouslyPixel and even number line pixel, may further include:
Utilize bilinear interpolation algorithm, form in such a way all pixels of target video image:
Read two odd-numbered line pixels and two even number line pixels simultaneously, form a pixel of target video image;
Wherein, two odd-numbered line pixels that read and two even number line pixels in raw video image four close onPixel.
With a preferred embodiment, the present invention is given to detailed explanation below.
As shown in Figure 3, the method that the embodiment of the present invention provides can be applied to following environment: controller connects respectively firstRAM and the 2nd RAM. The present embodiment can be realized the buffering to raw video image with external RAM, by controllerControl the transmission of video data. This controller includes but not limited to FPGA, CPLD, single-chip microcomputer etc.
The present embodiment is stored the odd-numbered line pixel in a frame raw video image with the first RAM, uses the 2nd RAMStore the even number line pixel in this frame raw video image.
While writing video data to external RAM, the first and second RAM concurrent workings, by every frame raw video imageOdd-numbered line pixel and even number line pixel write respectively in the first and second RAM simultaneously. In this way, writingWhen the capable video image pixel of n, need to carry out n/2 row write operation. Therefore, saved the data transfer bandwidth of half.
In the time having formed target video image from external RAM reading video data, from the first and second RAM, read simultaneouslyPixel, calculates the pixel of target video image, thereby forms target video image.
Particularly, suppose: four following A points of adjacent pixels point coordinates in raw video image: (y, x), B point: (y, x+1),C point: (y+1, x), D point: (y+1, x+1). wherein y represents the coordinate in vertical direction, and x represents in horizontal directionCoordinate. Close on for raw video image pixel for four, if hypothesis y is odd number, y+1 is even number; AsFruit supposes that y is even number, and y+1 is odd number.
Calculate target video image pixel f'(x, y according to following formula):
f'(x,y)＝(f(x,y)×a+f(y,x+1)×(1-a))×b+(f(y+1,x)×a+f(y+1,x+1)(1-a))(1-b)Wherein, a represents the linear interpolation parameter of horizontal direction; B represents the linear interpolation parameter of vertical direction.
Can find out from above-mentioned formula, four are closed on raw video image pixel and have following features:
Two pixels are from odd-numbered line; Two other pixel is from even number line; With two pixel left and right in a lineAdjacent.
So, when from external RAM reading video data, according to bilinear interpolation algorithm, can from a RAM, readGet two pixels, then from the 2nd RAM, read two pixels, utilize above-mentioned formula, calculate target video figureA pixel of picture. By that analogy, just can obtain whole pixels of target video image.
In this way, for the capable video image pixel of n, need to carry out the read operation of 2n row, can obtainThe capable pixel of 4n. Compared with prior art, can save data transfer bandwidth.
In addition, the present invention uses external RAM, does not take the RAM of controller inside, has saved the internal RAM of controller.
In the present embodiment, each step is described according to the mode of above-mentioned precedence, those skilled in the art canUnderstand, in order to realize the effect of the present embodiment, between different steps, needn't carry out according to such order, it can be sameShi Zhihang or execution order are put upside down, and these simply change all within protection scope of the present invention.
Based on the technical conceive identical with embodiment of the method, the embodiment of the present invention also provides a kind of projection based on video bufferDevice. As shown in Figure 4, this device 40 can comprise acquisition module 42, buffer module 44, geometric correction module 46With projection submodule 48. Wherein, acquisition module 42 is configured to obtain raw video image. Buffer module 44 is configuredFor buffering raw video image, obtain target video image. Geometric correction module 46 is configured to target video image,And carry out geometric correction. Projection submodule 48 is configured to the projecting video image after geometric correction to curtain. ItsIn, buffer module comprises buffer sublayer module 442. Wherein, buffer sublayer module 442 is configured to described original video figurePicture is divided into odd-numbered line pixel and even number line pixel, and described odd-numbered line pixel and described even number line pixel are entered respectivelyRow buffering.
In an optional embodiment, as shown in Figure 5, buffer sublayer module 50 specifically can comprise: memory module 52With read module 54. Wherein, memory module 52 is configured to odd-numbered line pixel and the even number line of raw video imagePixel is stored separately respectively. Read module 54 is configured to read the odd-numbered line picture in raw video image simultaneouslyVegetarian refreshments and even number line pixel.
In an optional embodiment, read module specifically comprises the first read module. Wherein, the first read module quiltBe configured to utilize bilinear interpolation algorithm, read odd-numbered line pixel and even number line pixel in raw video image simultaneously.
In an optional embodiment, the first read module may further include the second read module. Wherein, secondRead module is configured to utilize bilinear interpolation algorithm, forms in such a way all pixels of target video image:Read two odd-numbered line pixels and two even number line pixels simultaneously, form a pixel of described target video image;Wherein, two the odd-numbered line pixels and two the even number line pixels that read are four pictures that close in raw video imageVegetarian refreshments.
In an optional embodiment, memory module comprises: a RAM and the 2nd RAM. Wherein, a RAM quiltBe configured to store the odd-numbered line pixel of raw video image. The 2nd RAM is configured to store the even number of raw video imageRow pixel.
It should be noted that: the projection arrangement that above-described embodiment provides is in the time carrying out projection, only with above-mentioned each functional moduleDivision is illustrated, and in actual applications, can as required above-mentioned functions be distributed by different functional modulesComplete, be divided into different functional modules by the internal structure of device, described above all or part of to completeFunction.
Said apparatus embodiment can be for carrying out said method embodiment, its know-why, the technical problem solving andThe technique effect producing is similar, and person of ordinary skill in the field can be well understood to, and is convenience and the letter describedClean, the specific works process of the device of foregoing description, can be with reference to the corresponding process in preceding method embodiment, at this notRepeat again.
Be to be noted that above and respectively device embodiment of the present invention and embodiment of the method be described, but to oneThe details that individual embodiment describes also can be applicable to another embodiment. For the module relating in the embodiment of the present invention, stepTitle, be only used to distinguish modules or step, be not considered as inappropriate limitation of the present invention. Art technologyPersonnel are appreciated that module or the step in the embodiment of the present invention can also decompose or combine. For example above-mentioned enforcementThe module of example can be merged into a module, also can further split into multiple submodules.
In addition, the embodiment of the present invention also provides a kind of projecting apparatus. As shown in Figure 6, this projecting apparatus 60 can comprise above-mentionedProjection arrangement 62 described in device embodiment.
The technical scheme above embodiment of the present invention being provided is described in detail. Although applied concrete hereinIndividual example is set forth principle of the present invention and embodiment, and still, the explanation of above-described embodiment is only applicable to help reasonSeparate the principle of the embodiment of the present invention; Meanwhile, to those skilled in the art, according to the embodiment of the present invention, specificallyWithin embodiment and range of application, all can make a change.
It should be noted that: the mark in accompanying drawing and word, just in order to be illustrated more clearly in the present invention, are not considered as thisThe improper restriction of bright protection domain.
Term " comprises ", " comprising " or any other similar term are intended to contain comprising of nonexcludability, thereby makesThe process, method, article or the equipment/device that comprise a series of key elements not only comprise those key elements, but also comprise notThere is other key element of clearly listing, or also comprise intrinsic the wanting of these processes, method, article or equipment/deviceElement. The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within and compriseIn process, method, article or the equipment/device of described key element, also there is other key element, " comprise one "The meaning also contains the meaning of " comprising another ".
Each step of the present invention can realize with general calculation element, and for example, they can concentrate on single meterFor example calculate, on device: personal computer, server computer, handheld device or portable set, laptop device orPerson's multi-processor device, also can be distributed on the network that multiple calculation elements form, and they can be to be different from hereinOrder carry out shown or described step, or they are made into respectively to each integrated circuit modules, or by itIn multiple modules or step be made into single integrated circuit module and realize. Therefore, the invention is not restricted to any specificHardware and software or its combination.
Method provided by the invention can realize with PLD, also may be embodied as computer softwareOr program module (routine, program, object, assembly that it comprises execution particular task or realizes particular abstract data typeOr data structure etc.), can be for example a kind of computer program according to embodiments of the invention, move this calculatingMachine program product is carried out for demonstrated method computer. Described computer program comprises computer-readable storageMedium, comprises computer program logic or code section on this medium, for realizing described method. Described computer-readableStorage medium can be installed in the built-in medium in computer or can disassemble from basic computer canMove media (for example: the memory device that adopts hot plug technology). Described built-in medium includes but not limited to rewritableNonvolatile memory, for example: RAM, ROM, flash memory and hard disk. Described removable medium includes but not limited to:Optical storage media (for example: CD-ROM and DVD), magnetic-optical storage medium (for example: MO), magnetic storage medium (for example:Tape or portable hard drive), there are the media (for example: storage card) of built-in rewritable nonvolatile memory and haveThe media (for example: ROM box) of built-in ROM.
The present invention is not limited to above-mentioned embodiment, in the situation that not deviating from flesh and blood of the present invention, and the common skill in this areaAny distortion, improvement or replacement that art personnel can expect all fall into scope of the present invention.
Although above illustrated, described and pointed out be applicable to various embodiments basic novel feature of the present invention in detailDescribe, but will be understood that, do not departing from the invention is intended in the situation that, those skilled in the art can be to the shape of systemFormula and details are carried out various omissions, replacement and change.
Claims (10)
1. the projecting method based on video buffer, the method comprises:
Obtain raw video image;
Cushion described raw video image, obtain target video image;
To described target video image, and carry out geometric correction;
By the projecting video image after described geometric correction to curtain;
It is characterized in that, the described raw video image of described buffering comprises:
Described raw video image is divided into odd-numbered line pixel and even number line pixel, to described odd-numbered line pixel and instituteStating even number line pixel cushions respectively.
2. method according to claim 1, is characterized in that, described described strange to described raw video imageNumber row pixel and described even number line pixel cushion specifically and comprise respectively:
The described odd-numbered line pixel of described raw video image and described even number line pixel are stored separately respectively;
Read described odd-numbered line pixel and described even number line pixel in described raw video image simultaneously.
3. method according to claim 2, is characterized in that, described simultaneously reading in described raw video imageOdd-numbered line pixel and even number line pixel, specifically comprise:
Utilize bilinear interpolation algorithm, read described odd-numbered line pixel and described idol in described raw video image simultaneouslyNumber row pixel.
4. method according to claim 3, is characterized in that, the described bilinear interpolation algorithm that utilizes is read simultaneouslyGet described odd-numbered line pixel and described even number line pixel in described raw video image, specifically comprise:
Utilize described bilinear interpolation algorithm, form in such a way all pixels of described target video image:
Read two odd-numbered line pixels and two even number line pixels simultaneously, form a picture of described target video imageVegetarian refreshments;
Wherein, two odd-numbered line pixels that read described in and two even number line pixels are in described raw video imageFour pixels that close on.
5. the projection arrangement based on video buffer, this device comprises:
Acquisition module, is configured to obtain raw video image;
Buffer module, is configured to cushion described raw video image, obtains target video image;
Geometric correction module, is configured to described target video image, and carries out geometric correction;
Projection submodule, is configured to the projecting video image after described geometric correction to curtain;
It is characterized in that, described buffer module also comprises:
Buffer sublayer module, is configured to described raw video image to be divided into odd-numbered line pixel and even number line pixel, rightDescribed odd-numbered line pixel and described even number line pixel cushion respectively.
6. device according to claim 5, is characterized in that, described buffer sublayer module specifically comprises:
Memory module, is configured to the described odd-numbered line pixel of described raw video image and described even number line pixelStore separately respectively;
Read module is configured to read described odd-numbered line pixel and described even number in described raw video image simultaneouslyRow pixel.
7. device according to claim 6, is characterized in that, described read module specifically comprises:
The first read module, is configured to utilize bilinear interpolation algorithm, reads the institute in described raw video image simultaneouslyState odd-numbered line pixel and described even number line pixel.
8. device according to claim 7, is characterized in that, described the first read module specifically comprises:
The second read module, is configured to utilize described bilinear interpolation algorithm, forms in such a way described target and looksFrequently all pixels of image:
Read two odd-numbered line pixels and two even number line pixels simultaneously, form a picture of described target video imageVegetarian refreshments;
Wherein, two odd-numbered line pixels that read described in and two even number line pixels are in described raw video imageFour pixels that close on.
9. device according to claim 6, is characterized in that, described memory module comprises:
The one RAM, is configured to store the described odd-numbered line pixel of described raw video image;
The 2nd RAM, is configured to store the described even number line pixel of described raw video image.
10. a projecting apparatus, is characterized in that, comprises in claim 6-10 arbitrary described based on video bufferProjection arrangement.
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