CN106231276A - A kind of short out-of-focus projection image correcting method for curved surface curtain and system thereof - Google Patents
A kind of short out-of-focus projection image correcting method for curved surface curtain and system thereof Download PDFInfo
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- CN106231276A CN106231276A CN201610603945.1A CN201610603945A CN106231276A CN 106231276 A CN106231276 A CN 106231276A CN 201610603945 A CN201610603945 A CN 201610603945A CN 106231276 A CN106231276 A CN 106231276A
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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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
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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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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a kind of short out-of-focus projection image correcting method for curved surface curtain and system thereof, method includes: A, the size obtaining curved surface curtain and the curvature of curved surface curtain；B, based on the geometry site between projector and curved surface curtain, calculate the second falling head of the projected pixel on the first falling head of the projected pixel on the upper edge of curved surface curtain and the lower edge of described curved surface curtain；C, according to described first falling head and the second falling head, calculated the target falling head of the projected pixel obtained in described original projection image by linear interpolation；D, according to described target falling head, adjust the position of projected pixel thus obtain and repair orthographic view.By the calculating of geometry site, the projects images of projector is carried out Geometric corrections, it is possible to project at curved surface curtain, it is to avoid the problem that metamorphopsic distortion occurs in image.
Description
Technical field
The present invention relates to project technical field of image processing, particularly relate to a kind of short out-of-focus projection image for curved surface curtain
Modification method and system thereof.
Background technology
In recent years, in field of projection display, short focus projector has been increasingly becoming the focus of development, fast in evolution
Speed obtains liking of users.Short focus projector is a much progress of projection field, and it has the shortest transmittance and (i.e. throws
Shadow machine is to the ratio of the distance between screen with screen size).Projector part over several inches from screen surface can will be drawn
Face projects on giant-screen (70 inches or more than).Walk about before scialyscope and block the situation of picture on screen and will not deposit again
?.By ultrashort out-of-focus projection instrument, viewing can become clear and coloury giant-screen shadow in any room, classroom and meeting room
Picture.
It addition, along with the development of technology, curved surface TV is more and more universal in recent years.Curved surface TV is relative to commonly
Flat-surface television, has following several clear superiority: 1. human eye vision is experienced more comfortable；2. bring picture telepresenc more true to nature；
3. viewing visual angle is wider；4. curved-surface structure can obtain bigger display area in the confined space.
Therefore, if projector curtain is set to curved surface, also same excellent by obtaining for conventional planar curtain
Gesture.But due to the change of geometric space, as depicted in figs. 1 and 2, the projection picture of projector can distort, on curved surface curtain
The problem that metamorphopsic distortion etc. occurs.Thus, there is no method in projection field to be widely applied.
Therefore, prior art need development.
Summary of the invention
In place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of short Jiao for curved surface curtain
Projection image correcting method and system thereof, it is intended to the projection picture solving prior art mean camber curtain exists anamorphose distortion
Problem.
In order to achieve the above object, this invention takes techniques below scheme:
A kind of short out-of-focus projection image correcting method for curved surface curtain, wherein, described short out-of-focus projection image correcting method includes:
A, the size obtaining curved surface curtain and the curvature of curved surface curtain；
B, based on the geometry site between projector and curved surface curtain, obtain the upper edge of curved surface curtain projected pixel the
One falling head, and the second falling head of the projected pixel on the lower edge of described curved surface curtain；
C, according to described first falling head and the second falling head, calculated by linear interpolation and obtain described original projection image
In the target falling head of projected pixel；
D, according to described target falling head, adjust the position of projected pixel thus obtain and repair orthographic view.
Described short out-of-focus projection image correcting method, wherein, described projector is arranged on horizontal plane, with described curved surface
The axis of curtain is relative.
Described short out-of-focus projection image correcting method, wherein, in stepb, described first falling head is calculated according to following
Formula calculates:
Wherein, y is the first falling head, and x is the distance of projected pixel Distance surface curtain axis, and H is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
The described short out-of-focus projection image correcting method for curved surface curtain, wherein, in stepb, described second declines
Height calculates according to following formula:
Wherein, y1Being the second falling head, x is the distance of projected pixel Distance surface curtain axis, and H` is the upper of curved surface curtain
Along height, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
The described short out-of-focus projection image correcting method for curved surface curtain, wherein, described step D specifically includes:
D1, with the upper left corner of original projection image as zero, set up orthogonal axis；
D2, the width obtaining the original projection image that scialyscope is play and height also determine therefrom that the projection image of original projection image
Element coordinate；
D3, ratio according to described target falling head Yu the height of original projection image, calculate and obtain the projected pixel revised
Coordinate, is formed and repaiies orthographic view.
A kind of short out-of-focus projection image correction system for curved surface curtain, wherein, described system includes:
Input module, for obtaining size and the curvature information of curved surface curtain of curved surface curtain；
Geometrical calculation module, for based on the geometry site between projector and curved surface curtain, calculating the upper of curved surface curtain
First falling head of the projected pixel on edge, and the second falling head of the projected pixel on the lower edge of described curved surface curtain；
Corrected Calculation module, for according to described first falling head and the second falling head, is calculated by linear interpolation and obtains
The target falling head of the projected pixel in described original projection image；
Image adjustment module, for according to described target falling head, adjusting the position of projected pixel thus obtain correction projection
Image.
The described short out-of-focus projection image correction system for curved surface curtain, wherein, described projector is arranged at level and puts down
On face, relative with the axis of described curved surface curtain.
The described short out-of-focus projection image correction system for curved surface curtain, wherein, depends in described geometrical calculation module
According to following formula described first falling head of calculating:
Wherein, y is the first falling head, and x is the distance of projected pixel Distance surface curtain axis, and H is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
The described short out-of-focus projection image correction system for curved surface curtain, wherein, depends in described geometrical calculation module
According to following formula described second falling head of calculating:
Wherein, y1Being the second falling head, x is the distance of projected pixel Distance surface curtain axis, and H` is the upper of curved surface curtain
Along height, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
Described short out-of-focus projection image correction system, wherein, described image adjustment module specifically includes:
Original image information acquisition unit, for the upper left corner of original projection image as zero, setting up orthogonal axis；
Positioning unit, is used for obtaining the width of the original projection image that scialyscope is play and height and determining therefrom that original projection figure
The projected pixel coordinate of picture；
Image correction unit, for the ratio according to described target falling head Yu the height of original projection image, calculates and obtains
The projected pixel coordinate revised, is formed and repaiies orthographic view.
Beneficial effect: a kind of short out-of-focus projection image correcting method for curved surface curtain of present invention offer and system thereof,
By the calculating of geometry site, the projects images of projector is carried out Geometric corrections, it is possible to throw at curved surface (curved surface) curtain
Shadow, it is to avoid the problem that metamorphopsic distortion occurs in image so that short focus projector can be applied in curved-surface display, has the most aobvious
Show effect.Whole modification method is simple and reliable, and operand is less, it is easy to accomplish, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is the projection picture imaging region schematic diagram in the plane of projector.
Fig. 2 is the projection picture of existing projector imaging region schematic diagram on curved surface.
Fig. 3 is the method flow diagram of the short out-of-focus projection image correcting method of the specific embodiment of the invention.
Fig. 4 is projector and the top view of curved surface curtain of the specific embodiment of the invention.
Fig. 5 is projector and the side view of curved surface curtain of the specific embodiment of the invention.
Fig. 6 is the structured flowchart of the short out-of-focus projection image correction system of the specific embodiment of the invention.
Detailed description of the invention
The present invention provides a kind of short out-of-focus projection image correcting method and system thereof.For making the purpose of the present invention, technical scheme
And effect is clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.Should be appreciated that this
Specific embodiment described by place only in order to explain the present invention, is not intended to limit the present invention.
As it is shown in figure 1, be the projection picture display schematic diagram in the plane of projector, its imaging region be one upright
Rectangle.And when being projected on the curved surface curtain with certain radian, shape as shown in Figure 2 will be deformed into.
Change according to Fig. 1 and Fig. 2, it is known that certain adjustment should be carried out for the height of image in the vertical direction.
As it is shown on figure 3, be the one short out-of-focus projection image correcting method of the specific embodiment of the invention.Described short out-of-focus projection schemes
As modification method includes:
Step S100, the size obtaining curved surface curtain and the curvature of curved surface curtain.
Step S200, based on the geometry site between projector and curved surface curtain, calculate the upper edge of curved surface curtain
First falling head of projected pixel, and the second falling head of the projected pixel on the lower edge of curved surface curtain.
After the size obtaining curved surface curtain and curvature, owing to the relative position between projector with curtain should be fixing
(position with optimal drop shadow effect is unique), the geometrical calculation mode meters such as similar triangles, circular arc calculating can be passed through
Calculate and obtain the height that projected pixel should be revised.
Described upper edge and lower edge can use identical method to calculate the first corresponding falling head and the second falling head,
Only need the height that Level Change is lower edge on upper edge.
Step S300, according to described first falling head and the second falling head, calculated by linear interpolation obtain described
The target falling head of the projected pixel in original projection image.
Owing to its functional form is straight line, therefore, it can be convenient to use the method for linear interpolation, according to abovementioned steps
Two end points obtained in S200, calculate and obtain the target falling head of each projected pixel in image.
Step S400, according to described target falling head, adjust the position of projected pixel thus obtain and repair orthographic view.
The position of projected pixel, according to the result calculated, is adjusted correspondingly can completing to repair for projection picture by scialyscope
Just.
Hereinafter the process of Geometric corrections is stated in detail.In the present embodiment, described projector be arranged at level put down
On face, relative with the axis of described curved surface curtain.As shown in Figure 4, for the top view of projector Yu curved surface curtain.Such as Fig. 5 institute
Show, for the top view of projector Yu curved surface curtain.
Wherein, AB is respectively the two ends of curved surface curtain 10, and the center of circle of curved surface curtain 10 place circular arc is positioned at an O`, projector
Camera lens be positioned at an O, H is the height of curtain 10.
As shown in Figure 4, there is following geometrical relationship:
Obvious, R is the radius of circle, for the central angle of curved surface curtain 10 place circular arc, L be scialyscope with AB place plane (i.e.
The datum plane of curtain) distance.
As it is shown in figure 5, there is following geometrical relationship:
J` and I` was respectively the vertical line of J point and I point and the intersection point on ground.
Making O` is zero, and K is any point on curtain datum plane, and its abscissa is the most traversing amount of x(), it is full
The deformation requirements on edge on foot projection screen, needing, at some K, the height reduced is the first the most above-mentioned for B`K(falling head y).
As it is shown in figure 5, according to Similar Principle of Triangle, have
(1)
As shown in Figure 4, then have:
(2)
Owing to straight line OK intersects at a Q with circle O`, then have:
(3)
Simultaneous formula (1), (2), (3), can be in the hope of:
(4)
Wherein, y is the first falling head, and x is the distance of projected pixel Distance surface curtain axis, and H is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
Can be calculated by formula (4) and obtain in the case of predetermined traversing amount x, corresponding projected pixel needs decline
Highly.
From above-mentioned derivation, calculating and the computational methods of the first falling head of described second falling head (i.e. descending edge)
Identical, difference be by curved surface curtain along height adjustment be curved surface curtain lower along height.Therefore, described second declines height
Degree y1Can calculate according to following formula:
(5)
Wherein, y1Being the second falling head, x is the distance of projected pixel Distance surface curtain axis, and H` is the upper of curved surface curtain
Along height, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
Concrete, for the original image that scialyscope is play, described step S400 specifically includes:
Step S401, with the upper left corner of original projection image as zero, set up orthogonal axis；
Step S402, the width obtaining the original projection image that scialyscope is play and height also determine therefrom that original projection image
Projected pixel coordinate；
Step S403, ratio according to described target falling head Yu the height of original projection image, calculate and obtain the throwing revised
Shadow pixel coordinate, is formed and repaiies orthographic view.
First the width WID and height HEI of the original projection image that scialyscope is play, are obtained.Then, with original projection
The upper left corner of image is zero (0,0), sets up rectangular coordinate system, determine original projection image projected pixel coordinate (X,
Y)。
After setting up rectangular coordinate system: according to described target falling head, the width of original projection image and height, calculate
Obtain the projected pixel coordinate (X`, Y`) revised, formed and repair orthographic view.
According to above-mentioned derivation, it is known that with the upper left corner (0,0) as zero of original projection image when, throw
Shadow pixel coordinate (X, Y) with the relation of x is:
(6)
Therefore, x is calculated by following formula:
(7)
Thus, revised projected pixel coordinate (X`, Y`) is:
(8)
(9)
(10)
(11)
(12)
According to formula (8) to formula (12), result after the correction obtaining each projected pixel of original projection image can be calculated, from
And obtain and final repair orthographic view.
Based on above-mentioned short out-of-focus projection image correcting method, the present invention also provides for a kind of short out-of-focus projection image correction system.As
Shown in Fig. 6, described short out-of-focus projection image correction system includes:
Input module 100, for obtaining size and the curvature of curved surface curtain of curved surface curtain；
Geometrical calculation module 200, for based on the geometry site between projector and curved surface curtain, calculates projector at song
First falling head of the projected pixel in the upper edge of the original projection image on the curtain of face；And calculate described original projection figure
Second falling head of the projected pixel in the lower edge of picture；
Corrected Calculation module 300, for according to described first falling head and the second falling head, is calculated by linear interpolation and obtains
The target falling head of projected pixel in described original projection image；
Image adjustment module 400, for according to described target falling head, adjusting the position of projected pixel thus obtain correction and throw
Shadow image.As detailed above.
Concrete, described projector is arranged on horizontal plane, relative with the axis of described curved surface curtain.The most as above
Described.
More specifically, according to following formula described first falling head of calculating in described geometrical calculation module 200:
Wherein, y is the first falling head, and x is the distance of projected pixel Distance surface curtain axis, and H is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.As detailed above
More specifically, according to following formula described second falling head of calculating in described geometrical calculation module 200:
Wherein, y1Being the second falling head, x is the distance of projected pixel Distance surface curtain axis, and H` is the upper of curved surface curtain
Along height, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
In a particular embodiment of the present invention, described image adjustment module 400 specifically includes:
Original image information acquisition unit, for the upper left corner of original projection image as zero, setting up orthogonal axis；
Positioning unit, is used for obtaining the width of the original projection image that scialyscope is play and height and determining therefrom that original projection figure
The projected pixel coordinate of picture；
Image correction unit, for the ratio according to described target falling head Yu the height of original projection image, calculates and obtains
The projected pixel coordinate revised, is formed and repaiies orthographic view.
In sum, the invention provides a kind of short out-of-focus projection image correcting method and system thereof, method includes: A, acquisition
The size of curved surface curtain and the curvature of curved surface curtain；B, based on the geometry site between projector and curved surface curtain, calculate
The second of the projected pixel on the first falling head of the projected pixel on the upper edge of curved surface curtain and the lower edge of described curved surface curtain
Falling head；C, according to described first falling head and the second falling head, calculated by linear interpolation and obtain described original throwing
The target falling head of the projected pixel in shadow image；D, according to described target falling head, adjust the position of projected pixel from
And obtain and repair orthographic view.By the calculating of geometry site, the projects images of projector is carried out Geometric corrections, it is possible to
Project at curved surface (curved surface) curtain, it is to avoid the problem that metamorphopsic distortion occurs in image.
It is understood that for those of ordinary skills, can according to technical scheme and this
Bright design in addition equivalent or change, and all these change or replace the guarantor that all should belong to appended claims of the invention
Protect scope.
Claims (10)
1. the short out-of-focus projection image correcting method for curved surface curtain, it is characterised in that described short out-of-focus projection image correction
Method includes:
A, the size obtaining curved surface curtain and the curvature of curved surface curtain；
B, based on the geometry site between projector and curved surface curtain, obtain the upper edge of curved surface curtain projected pixel the
One falling head, and the second falling head of the projected pixel on the lower edge of described curved surface curtain；
C, according to described first falling head and the second falling head, calculated by linear interpolation and obtain described original projection image
In the target falling head of projected pixel；
D, according to described target falling head, adjust the position of projected pixel thus obtain and repair orthographic view.
Short out-of-focus projection image correcting method for curved surface curtain the most according to claim 1, it is characterised in that described throwing
Shadow instrument is arranged on horizontal plane, relative with the axis of described curved surface curtain.
Short out-of-focus projection image correcting method for curved surface curtain the most according to claim 2, it is characterised in that in step
In B, described first falling head calculates according to following formula:
Wherein, y is the first falling head, and x is the distance of projected pixel Distance surface curtain axis, and H is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
Short out-of-focus projection image correcting method for curved surface curtain the most according to claim 2, it is characterised in that in step
In B, described second falling head calculates according to following formula:
Wherein, y1Being the second falling head, x is the distance of projected pixel Distance surface curtain axis, and H` is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
Short out-of-focus projection image correcting method for curved surface curtain the most according to claim 1, it is characterised in that described step
Rapid D specifically includes:
D1, with the upper left corner of original projection image as zero, set up orthogonal axis；
D2, the width obtaining the original projection image that scialyscope is play and height also determine therefrom that the projection image of original projection image
Element coordinate；
D3, ratio according to described target falling head Yu the height of original projection image, calculate and obtain the projected pixel revised
Coordinate, is formed and repaiies orthographic view.
6. the short out-of-focus projection image correction system for curved surface curtain, it is characterised in that described system includes:
Input module, for obtaining size and the curvature of curved surface curtain of curved surface curtain；
Geometrical calculation module, for based on the geometry site between projector and curved surface curtain, calculating the upper of curved surface curtain
First falling head of the projected pixel on edge, and the second falling head of the projected pixel on the lower edge of described curved surface curtain；
Corrected Calculation module, for according to described first falling head and the second falling head, is calculated by linear interpolation and obtains
The target falling head of the projected pixel in described original projection image；
Image adjustment module, for according to described target falling head, adjusting the position of projected pixel thus obtain correction projection
Image.
Short out-of-focus projection image correction system for curved surface curtain the most according to claim 6, it is characterised in that described throwing
Shadow instrument is arranged on horizontal plane, relative with the axis of described curved surface curtain.
Short out-of-focus projection image correction system for curved surface curtain the most according to claim 7, it is characterised in that described
According to following formula described first falling head of calculating in geometrical calculation module:
Wherein, y is the first falling head, and x is the distance of projected pixel Distance surface curtain axis, and H is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
Short out-of-focus projection image correction system for curved surface curtain the most according to claim 7, it is characterised in that described
According to following formula described second falling head of calculating in geometrical calculation module:
Wherein, y1Being the second falling head, x is the distance of projected pixel Distance surface curtain axis, and H` is the upper edge of curved surface curtain
Highly, for the radian of the circular arc of curved surface curtain, L is the distance between projector and curved surface curtain axis, and R is curved surface curtain
The radius of circular arc.
Short out-of-focus projection the most according to claim 6 image correction system, it is characterised in that described image adjustment module has
Body includes:
Original image information acquisition unit, for the upper left corner of original projection image as zero, setting up orthogonal axis；
Positioning unit, is used for obtaining the width of the original projection image that scialyscope is play and height and determining therefrom that original projection figure
The projected pixel coordinate of picture；
Image correction unit, for the ratio according to described target falling head Yu the height of original projection image, calculates and obtains
The projected pixel coordinate revised, is formed and repaiies orthographic view.
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| CN106604006A (en) * | 2016-12-20 | 2017-04-26 | Tcl集团股份有限公司 | Curved surface curtain projection method and system for projection television |
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| CN106604006A (en) * | 2016-12-20 | 2017-04-26 | Tcl集团股份有限公司 | Curved surface curtain projection method and system for projection television |
| CN106604006B (en) * | 2016-12-20 | 2020-07-21 | 深圳市Tcl高新技术开发有限公司 | Curved curtain projection method and system suitable for projection television |
| CN108632585A (en) * | 2017-03-24 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of method for correcting image and device, storage medium, projection device |
| US11287646B2 (en) | 2017-03-24 | 2022-03-29 | Xi'an Zhongxing New Software Co., Ltd. | Method for correcting an image, storage medium and projection device |
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