CN103686028A - Video pixel alternate interpolation method for large-screen and multi-projection system - Google Patents
Video pixel alternate interpolation method for large-screen and multi-projection system Download PDFInfo
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- CN103686028A CN103686028A CN201310632496.XA CN201310632496A CN103686028A CN 103686028 A CN103686028 A CN 103686028A CN 201310632496 A CN201310632496 A CN 201310632496A CN 103686028 A CN103686028 A CN 103686028A
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Abstract
The invention discloses a video pixel alternate interpolation method for a large-screen and multi-projection system. According to the video pixel alternate interpolation method, transverse interpolation and longitudinal interpolation are alternately performed according to frames, and color information of all pixels in various secondary video frames is obtained, and is outputted according to a relevant video time sequence rule. According to the video pixel alternate interpolation method, the transverse interpolation and the longitudinal interpolation are alternately performed at high speed according to the frames so as to generate the secondary video frames; a final displaying effect observed by eyes of a human body simultaneously comprises a transverse interpolation effect and a longitudinal interpolation effect by using a vision persistence effect; a high displaying effect close to a bilinear interpolation scheme is achieved; two pieces of pixel information in the original video frame are required to be read when a secondary video pixel is generated; and resource consumption and the requirement on speed are moderate.
Description
Technical field
The present invention relates to large screen projection and show field, be specifically related to a kind of video pixel for the many optical projection systems of large-screen and replace interpolation method.
Background technology
The many optical projection systems of large-screen are applied in the fields such as communications and transportation dispatch control, convention enforcement, fly simulation training, operational commanding widely.The many optical projection systems of large-screen as shown in Figure 1, are mainly comprised of four parts: video source, array of rear-projectors, video processing equipment, large-screen, array of rear-projectors is comprised of many projecting apparatus at present.The original video that video processing equipment is exported video source is processed, and output multi-channel sub-video, exports respectively different projecting apparatus to and carries out Projection Display.Due to the relative position of projecting apparatus view field and large-screen and the diversity of large-screen geometry, project content often cannot accurately be presented at the target area on large-screen, therefore need to carry out geometric correction to project content.By geometric correction, color correction and Fusion Edges, realize seamless splicedly, guarantee the continuity of view picture image content and the consistency of vision on screen.High-resolution original video picture is carried out processing and needing very large amount of calculation in real time, the resource of video processing equipment and the speed of service have been proposed to huge challenge, because caused the rising of whole many optical projection systems of large-screen cost.Therefore people wish to utilize alap resource consumption and rate request to realize good display effect.
Dimensional measurement demarcation is carried out in general multipair large-screen and projecting apparatus viewing area, calculates relevant geometric correction parameter, then by the geometric correction parameter obtaining, proofreaies and correct.For each pixel in sub-video picture, according to its coordinate position and geometric correction calculation of parameter, obtain its corresponding points coordinate in original video picture, according to this corresponding points coordinate, original video picture is sampled, obtain the color value of pixel in sub-video picture.Because the coordinate of pixel in video pictures is integer, and therefore the corresponding points coordinate calculating decimal often need to utilize certain algorithm to carry out pixel sampling.For the method for pixel sampling mainly contain that point of proximity is approximate, linear interpolation and bilinear interpolation.
First point of proximity approximation method all carries out round by the abscissa in described corresponding points coordinate and ordinate component, and read the pixel color value in original video picture according to the corresponding points coordinate after rounding, as the color value of pixel in sub-video picture.Utilize the approximate method of neighbor point, sub-video pixel of every generation, only need to read a Pixel Information in original video picture, has minimum resource consumption and rate request, but because rounding of having carried out rounding up is approximate, sub-video picture can produce jaggy distortion.
Linear interpolation method generally comprises lateral interpolation and longitudinal two kinds of methods of interpolation.For lateral interpolation, first described corresponding points coordinate is longitudinally rounded, the ordinate component of corresponding points coordinate is carried out to round, the integer of abscissa component and fractional part are retained, according to the corresponding points coordinate after longitudinally rounding, read the color value of horizontal two the most contiguous pixels of this coordinate in original video picture, then using the fractional part of abscissa component in corresponding points coordinate as interpolation coefficient, read two pixels are carried out to linear interpolation, and the result obtaining is as the color value of pixel in sub-video picture.Longitudinally interpolation is approximate with lateral interpolation, distinguishes and is that longitudinal interpolation is that above-mentioned corresponding points coordinate is laterally rounded, and utilizes longitudinal two neighborhood pixels to carry out interpolation.Utilize the method for linear interpolation, sub-video pixel of every generation, need to read two Pixel Information in original video picture, compare point of proximity approximation method, its resource consumption and rate request have promoted one times, but owing to having carried out interpolation processing, the jaggy distortion of sub-video picture can significantly reduce.
Bilinear interpolation method retains integer and the fractional part of described corresponding points coordinate, according to corresponding points coordinate, read this coordinate in original video picture color value of four the most contiguous pixels around, then using the fractional part of abscissa component in corresponding points coordinate and ordinate component respectively as lateral interpolation coefficient and longitudinal interpolation coefficient, read four pixels are carried out to bilinear interpolation, and the result obtaining is as the color value of pixel in sub-video picture.Utilize the method for bilinear interpolation, sub-video pixel of every generation, need to read four Pixel Information in original video picture, compare point of proximity approximation method, its resource consumption and rate request are promoted to four times, but due to the interpolation processing of having carried out on transverse and longitudinal both direction, the jaggy distortion of sub-video picture is eliminated substantially.
In above several method, neighbor point approximation method is to utilize lower resource consumption and rate request to realize poor display effect, bilinear interpolation method is to utilize higher resource consumption and rate request to realize good display effect, and the half-way house that linear interpolation method is the above two, its display effect is not ideal enough.In order to improve as far as possible the cost performance of the many optical projection systems of large-screen, people wish to have a kind of video pixel interpolation method that moderate resource consumption and rate request can be realized better display effect simultaneously that has.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned existing scheme, provide a kind of and there is moderate resource consumption and rate request and can realize the video pixel of better display effect simultaneously and replace interpolation method.
Video pixel for the many optical projection systems of large-screen replaces an interpolation method, comprises the steps:
1) geometric calibration is carried out in the large scale display region in the many optical projection systems of large-screen and each projecting apparatus view field, obtain for the original video picture of geometric correction and the transfer function between sub-video picture;
2), according to described transfer function, calculate the coordinate of the corresponding points of each pixel in original video picture in each sub-video picture;
3) according to the coordinate of described corresponding points, the lateral interpolation that hockets frame by frame and longitudinally interpolation, interpolation result is as the Pixel Information of each frame sub-video picture and according to the output of associated video sequential rule.
A sub-video is comprised of a series of some frame sub-video pictures that occur successively on time shaft.Any pixel in every frame sub-video picture, correspondence position (the being corresponding points) sampling being from original video picture obtains Pixel Information (being color value).The present invention goes up each adjacent frame sub-video picture by the time and adopts respectively lateral interpolation (horizontal linear interpolation) and longitudinal interpolation (vertical linear interpolation), thereby utilize visual persistence effect (persistence of vision refers to that people retains a kind of biological phenomenon of a blink (about 0.1 second) on the retina at human eye at the reflection of observing object after object), eye-observation to final display effect comprise lateral interpolation and the longitudinal effect of interpolation simultaneously, effectively reduce the jaggy distortion of sub-video picture, realize the better display effect that approaches bilinear interpolation scheme.And any frame picture for sub-video, all only carry out lateral interpolation or longitudinal interpolation processing, generate a sub-video pixel and only need to read two Pixel Information in original video picture, with the comparison of bilinear interpolation scheme, resource consumption and rate request are all lower.
In associated video sequential rule output sub-video process, whether real-time judge present frame finishes, and switches to another kind of interpolation method, thereby guarantee that two adjacent frame sub-video pictures adopt different interpolation methods if finish.
The present invention does not have specific (special) requirements for first carrying out the still longitudinal interpolation of lateral interpolation.
Described Pixel Information is color value.
Lateral interpolation in described step (3) comprises the following steps:
(3-11) coordinate of described corresponding points is longitudinally rounded to the corresponding points coordinate after longitudinally being rounded, read the color value of horizontal two the most contiguous pixels of corresponding points in original video picture and after longitudinally rounding;
(3-12) fractional part of abscissa of getting corresponding points, as interpolation coefficient, is carried out interpolation to the color value of read two pixels, obtains the color value of respective pixel in this frame sub-video picture.
In described step (3-11), longitudinally round as the ordinate of corresponding points is carried out to round.
In described step (3-12) according to formula:
P(X,Y
s)＝(1-μ)·P(X
i,Y
s)+μ·P(X
i+1,Y
s)
Color value to read two pixels carries out interpolation, wherein P (X, Y
s) be the color value after corresponding points longitudinally round, P (X
i, Y
s) and P (X
i+ 1, Y
s) be respectively the color value of laterally the most contiguous two pixels, Y
sfor the corresponding points ordinate value after rounding, X is corresponding points abscissa value, and μ is the fractional part of corresponding points abscissa value, X
iinteger part for corresponding points abscissa value.
In described step (3), longitudinally interpolation comprises the following steps:
(3-21) described corresponding points coordinate is laterally rounded to the corresponding points coordinate after laterally being rounded, read the color value of longitudinal two the most contiguous pixels of corresponding points in original video picture and after laterally rounding;
(3-22) fractional part of ordinate of getting corresponding points, as interpolation coefficient, is carried out interpolation to the color value of read two pixels, obtains the color value of respective pixel in this frame sub-video picture.
In described step (3-21), laterally round and represent the abscissa of corresponding points to carry out round.
In described step (3-22) according to formula:
P(X
s,Y)＝(1-ν)·P(X
s,Y
i)+ν·P(X
s,Y
i+1)
Color value to read two pixels carries out interpolation, wherein P (X
s, Y) be the color value after corresponding points laterally round, P (X
s, Y
i) and P (X
s, Y
i+ 1) be respectively the color value of longitudinal two the most contiguous pixels, X
sfor the corresponding points abscissa value after rounding, the ordinate value that Y is corresponding points, the fractional part of the ordinate value that ν is corresponding points, Y
iinteger part for corresponding points ordinate value.
Video pixel for the many optical projection systems of large-screen of the present invention replaces interpolation method and adopts the method for hocket frame by frame at a high speed lateral interpolation and longitudinal interpolation to generate each frame picture of sub-video, due to visual persistence effect, eye-observation to final display effect comprise lateral interpolation and the longitudinal effect of interpolation simultaneously, realization approaches the better display effect of bilinear interpolation scheme, and any frame picture for sub-video, all only carry out lateral interpolation or longitudinal interpolation processing, sub-video pixel of every generation, need to read two Pixel Information in original video picture, resource consumption and rate request are moderate.
Accompanying drawing explanation
Fig. 1 is many optical projection systems of large-screen schematic diagram of the present invention;
Fig. 2 sets up coordinate system schematic diagram to video pictures in the embodiment of the present invention;
Fig. 3 is that the video pixel for the many optical projection systems of large-screen of the present invention replaces interpolation method schematic flow sheet;
Fig. 4 is the lateral interpolation principle schematic adopting in the present invention;
Fig. 5 is the longitudinal Interpolation Principle schematic diagram adopting in the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
The video pixel for the many optical projection systems of large-screen of the present embodiment replaces the many optical projection systems of the large-screen of interpolation method based on as shown in Figure 1 and completes video projection display.First build the many optical projection systems of the large-screen being formed by video source, large-screen, video processing equipment and array of rear-projectors.
In the present embodiment, the original video that video processing equipment is exported video source is processed, and output multi-channel sub-video, exports respectively different projecting apparatus to and carries out Projection Display.As shown in Figure 2, original video picture is considered as to two dimensional surface, sets up coordinate system.All pixels in original video picture are distinguished on horizontal and vertical both direction to number consecutively, and be defined as respectively abscissa and the ordinate of each pixel.
The video pixel for the many optical projection systems of large-screen of the present embodiment replaces interpolation method, as shown in Figure 3, comprises the steps:
(1) geometric calibration is carried out in the large scale display region in the many optical projection systems of large-screen and each projecting apparatus view field, obtain for the original video picture of geometric correction and the transfer function between sub-video picture;
(2), according to described transfer function, calculate the coordinate of the corresponding points of each pixel in original video picture in each sub-video picture;
(3) according to the coordinate of described corresponding points, the lateral interpolation that hockets frame by frame and longitudinally interpolation, interpolation result is as the Pixel Information of each frame sub-video picture and according to the output of associated video sequential rule.
In associated video sequential rule output procedure, whether real-time judge present frame finishes, and switches to another kind of interpolation method, if present frame does not finish if finish, continue to adopt current interpolation method, thereby guarantee that two adjacent frame sub-videos adopt different interpolation methods.As: present frame sub-video picture carries out lateral interpolation, after present frame finishes, next frame sub-video picture is carried out to longitudinal interpolation, hockets successively.
The coordinate of the corresponding points of a certain pixel is (X, Y), and wherein abscissa X is divided into integer part X
iwith fractional part μ; Ordinate Y is divided into integer part Y
iwith fractional part ν;
Longitudinally round the ordinate Y of corresponding points (X, Y) is carried out to round, result is Y
s, the coordinate of the corresponding points after therefore longitudinally rounding is (X, Y
s), longitudinally rounding the rear laterally coordinate of two the most contiguous pixels is (X
i, Y
s) and (X
i+ 1, Y
s);
Laterally round the ordinate X of corresponding points (X, Y) is carried out to round, result is X
s, the coordinate of the corresponding points after therefore laterally rounding is (X
s, Y), laterally rounding the rear longitudinally coordinate of two the most contiguous pixels is (X
s, Y
i) and (X
s, Y
i+ 1).
As shown in Figure 4, this point is carried out to lateral interpolation, detailed process is as follows:
(3-11) coordinate of corresponding points (X, Y) is longitudinally rounded to corresponding points coordinate (X, the Y after longitudinally being rounded
s), read corresponding points (X, Y in original video picture and after longitudinally rounding
s) horizontal two the most contiguous pixel (X
i, Y
s) and (X
i+ 1, Y
s) color value P (X
i, Y
s) and P (X
i+ 1, Y
s);
(3-12) the fractional part μ of abscissa that gets corresponding points (X, Y) is as interpolation coefficient, the color value P (X to read two pixels
i, Y
s) and P (X
i+ 1, Y
s) carry out interpolation, corresponding points (X, Y after longitudinally being rounded
s) color value P (X, Y
s), with P (X, Y
s) as the color value of this pixel in this frame sub-video picture, wherein according to following formula:
P(X,Y
s)＝(1-μ)·P(X
i,Y
s)+μ·P(X
i+1,Y
s)
Carry out interpolation.
As shown in Figure 5, this point is carried out to longitudinal interpolation, detailed process is as follows:
(3-21) coordinate of corresponding points (X, Y) is laterally rounded to the corresponding points coordinate (X after laterally being rounded
s, Y), read the corresponding points (X in original video picture and after laterally rounding
s, Y) longitudinal two the most contiguous pixel (X
s, Y
i) and (X
s, Y
i+ 1) color value P (X
s, Y
i) and P and (X
s, Y
i+ 1);
(3-22) the fractional part ν of ordinate that gets corresponding points (X, Y) is as interpolation coefficient, the color value P (X to read two pixels
s, Y
i) and P (X
s, Y
i+ 1) carry out interpolation, the corresponding points (X after laterally being rounded
s, color value P (X Y)
s, Y), with P (X, Y
s) as the color value of this pixel in this frame sub-video picture, wherein according to following formula:
P(X
s,Y)＝(1-ν)·P(X
s,Y
i)+ν·P(X
s,Y
i+1)
Carry out interpolation.
According to said method, adopt the color value of whole pixels in lateral interpolation or the longitudinal every frame sub-video of interpolation calculation picture, and according to the output in real time of video sequential rule, until this frame sub-video finishes.All pixels in same frame adopt identical interpolation method to calculate color value, and adjacent two frames adopt different interpolation methods, alternately all frames are carried out to lateral interpolation and longitudinal interpolation successively, and complete video output.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (8)
1. the video pixel for the many optical projection systems of large-screen replaces an interpolation method, it is characterized in that, comprises the steps:
(1) geometric calibration is carried out in the large scale display region in the many optical projection systems of large-screen and each projecting apparatus view field, obtain for the original video picture of geometric correction and the transfer function between sub-video picture;
(2), according to described transfer function, calculate the coordinate of the corresponding points of each pixel in original video picture in each sub-video picture;
(3) according to the coordinate of described corresponding points, the lateral interpolation that hockets frame by frame and longitudinally interpolation, interpolation result is as the Pixel Information of each frame sub-video picture and according to the output of associated video sequential rule.
2. the video pixel for the many optical projection systems of large-screen as claimed in claim 1 replaces interpolation method, it is characterized in that, described Pixel Information is color value.
3. the video pixel for the many optical projection systems of large-screen as claimed in claim 2 replaces interpolation method, it is characterized in that, the lateral interpolation in described step (3) comprises the following steps:
(3-11) coordinate of described corresponding points is longitudinally rounded to the corresponding points coordinate after longitudinally being rounded, read the color value of horizontal two the most contiguous pixels of corresponding points in original video picture and after longitudinally rounding;
(3-12) fractional part of abscissa of getting corresponding points, as interpolation coefficient, is carried out interpolation to the color value of read two pixels, obtains the color value of respective pixel in this frame sub-video picture.
4. the video pixel for the many optical projection systems of large-screen as claimed in claim 3 replaces interpolation method, it is characterized in that, in described step (3-11), longitudinally rounds as the ordinate of described corresponding points is carried out to round.
5. the video pixel for the many optical projection systems of large-screen as claimed in claim 4 replaces interpolation method, it is characterized in that, in described step (3-12) according to formula:
P(X,Y
s)＝(1-μ)·P(X
i,Y
s)+μ·P(X
i+1,Y
s)
Color value to read two pixels carries out interpolation, wherein P (X, Y
s) be the corresponding points color value after coordinate longitudinally rounds, P (X
i, Y
s) and P (X
i+ 1, Y
s) be respectively the color value of laterally the most contiguous two pixels, Y
sfor the corresponding points ordinate value after rounding, X is corresponding points abscissa value, and μ is the fractional part of corresponding points abscissa value, X
iinteger part for corresponding points abscissa value.
6. the video pixel for the many optical projection systems of large-screen as claimed in claim 2 replaces interpolation method, it is characterized in that, in described step (3), longitudinally interpolation comprises the following steps:
(3-21) described corresponding points coordinate is laterally rounded to the corresponding points coordinate after laterally being rounded, read the color value of longitudinal two the most contiguous pixels of corresponding points in original video picture and after laterally rounding;
(3-22) fractional part of ordinate of getting corresponding points, as interpolation coefficient, is carried out interpolation to the color value of read two pixels, obtains the color value of respective pixel in this frame sub-video picture.
7. the video pixel for the many optical projection systems of large-screen as claimed in claim 6 replaces interpolation method, it is characterized in that, in described step (3-21), laterally rounds as the abscissa of described corresponding points is carried out to round.
8. the video pixel for the many optical projection systems of large-screen as claimed in claim 7 replaces interpolation method, it is characterized in that, in described step (3-22) according to formula:
P(X
s,Y)＝(1-ν)·P(X
s,Y
i)+ν·P(X
s,Y
i+1)
Color value to read two pixels carries out interpolation, wherein P (X
s, Y) be the corresponding points color value after coordinate laterally rounds, P (X
s, Y
i) and P (X
s, Y
i+ 1) be respectively the color value of longitudinal two the most contiguous pixels, X
sfor the corresponding points abscissa value after rounding, the ordinate value that Y is corresponding points, the fractional part of the ordinate value that ν is corresponding points, Y
iinteger part for corresponding points ordinate value.
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Cited By (1)
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