WO2015167262A1 - System and method for correcting distortion image due to curved surface - Google Patents
System and method for correcting distortion image due to curved surface Download PDFInfo
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- WO2015167262A1 WO2015167262A1 PCT/KR2015/004353 KR2015004353W WO2015167262A1 WO 2015167262 A1 WO2015167262 A1 WO 2015167262A1 KR 2015004353 W KR2015004353 W KR 2015004353W WO 2015167262 A1 WO2015167262 A1 WO 2015167262A1
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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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- the present invention relates to a system and method for correcting distortion image due to curved surface, and more particularly to a system for correcting distortion image due to curved surface configured to enable a desired image to be displayed on any curved surface by correcting an image distorted by various types of curved surfaces, and a method thereof.
- Some of the methods to correct a distorted image generated by the curved surface include a coordinate mapping correction method using a camera, a correction method using a diameter of a curved surface and a correction method using an optical device.
- the coordinate mapping correction method using a camera is a method in which an image configured to recognize a position of a coordinate such as a checked pattern is outputted to a screen by a projector, a distorted checked pattern is measured by a camera, and the image is corrected by calculating a distorted degree of the coordinate.
- the correcting method using a diameter of a curved surface is a method in which pixel data is moved as much as an arc made based on an approximate radius of a curved surface to distort an image, and outputted to the curved surface to allow a correct image to be expressed on the curved surface.
- the correction method using an optical device is a method in which an optical device is interposed between a projector and a curved surface, where the optical device receives an image outputted from the projector, and the image is normally expressed by allowing the image to be outputted to the curved surface in a spot type set by the image.
- those conventional correction methods are difficult to be realized in a hardware-based system, but may be a method applicable to software system and disadvantageously slow in reaction speed. Furthermore, those conventional correction methods may require a camera with a high resolution, resulting in generation of high cost for installation of high-cost camera. On top of that, when correction is made based on optical device, it is difficult to accurately correct the distortion, and the optical device is conventionally set to be applied to a particular screen, resulting in difficulty in flexible application to other curved surfaces.
- a system for correcting distortion image displayed on a curved screen installed on an installation surface by being outputted from an image output device comprising:
- a setting unit configured to provide a parameter necessary for calculating a correction value for correcting an image distortion
- a correction value calculation unit configured to calculate a correction value, which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit;
- a correction unit configured to output a correction image data based on the correction value calculated by the correction value calculation unit and an inputted image data.
- the parameter may include a horizontal distance between a point of screen captured with each pixel of image and image output device, a horizontal distance between the imaginary vertical reference surface and the image output device, a height of pixel unit of the screen and a vertical height of pixel unit between the image output device and the screen.
- the correction value calculation unit may calculate the correction value using the following Equation 1:
- hc is a correction value
- hs is a height of pixel unit of screen
- hb is a correction reference value of pixel unit for calculating the correction value
- the correction reference value may be a position on the imaginary vertical reference surface corresponding to that of an image data desired to be displayed on the screen, and calculated by using the following Equation 2:
- d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device
- d1 is a horizontal distance between an imaginary vertical reference surface and the image output device
- hs is a height of a screen (unit: pixel)
- hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel).
- the correction unit may be configured to output the correction image data by moving the inputted image data as much as a pixel corresponding to the correction value.
- a method for correcting a distortion image displayed on a curved surface installed on an installation surface by being outputted from an image output device comprising:
- a correction value which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit;
- the parameter may include a horizontal distance between a point of screen captured with each pixel of image and image output device, a horizontal distance between the imaginary vertical reference surface and the image output device, a height of pixel unit of the screen and a vertical height of pixel unit between the image output device and the screen.
- the correction value calculation unit may calculate the correction value using the following Equation 1:
- hc is a correction value
- hs is a height of pixel unit of screen
- hb is a correction reference value of pixel unit for calculating the correction value
- the correction reference value may be a position on the imaginary vertical reference surface corresponding to that of an image data desired to be displayed on the screen, and calculated by using the following Equation 2:
- d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device
- d1 is a horizontal distance between an imaginary vertical reference surface and the image output device
- hs is a height of a screen (unit: pixel)
- hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel).
- the correction step may include outputting the correction image data by moving the inputted image data as much as a pixel corresponding to the correction value.
- the present invention has an advantageous effect in that a correction value is obtained based on an imaginary vertical reference surface formed by vertically extending a point of a screen of shortest distance from an image output device to allow calculating the correction value regardless of a shape of the screen.
- Another advantageous effect is that a distance between a screen (S) and an image output device (P), and a height of the screen (S) and a height of the image output device (P) are used to calculate a correction value, such that the present invention can be applied to where the image output device (P) is placed at a position lower than the screen (S), and to wherever position the output device is positioned as well.
- FIG. 1 is a block diagram illustrating a system (100) for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
- FIG. 2 is a flow chart illustrating a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
- FIG. 3 is an arrangement view of a screen and a projector for explaining a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
- FIG. 4 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from a lateral surface.
- FIG. 5 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from an upper surface
- FIGS. 6 to 8 are views illustrating various examples of screens applicable by a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
- FIG. 1 is a block diagram illustrating a system (100) for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
- the system (100) for correcting a distortion image due to curved surface may include a setting unit (110), a correction value calculation unit (120) and a correction unit (130). It should be apparent that the system (100) may further include other additional configurations for correcting an image.
- the curved surface distortion correction according to the system (100) for correcting a distortion image may be realized by correction of left/right keystone corrections based on a point left/right images are captured, where the system (100) may be so configured as to horizontally correct the curved surface distortion image.
- the setting unit (110) is so configured as to provide a parameter necessary for the correction value calculation unit (120) to calculate a correction value.
- the parameter may be a height of a pixel unit of a screen, a horizontal distance between an image output device and a screen-installed installation surface, a shortest horizontal distance between the screen and the image output device, and a vertical height of pixel unit between the image output device and a bottom surface of the screen.
- the parameter may further include a size of a screen and a curvature of the screen, whereby any types of curved surfaces can be corrected by setting of these parameters.
- the correction value calculation unit (120) may calculate a correction value based on the parameter provided by the setting unit (110). At this time, a method for calculating the correction value will be described later with reference to FIGS. 2 to 4.
- the correction unit (130) may output a correction image data by correcting an inputted image data in response to a correction value calculated by the correction value calculation unit (120). At this time, the correction unit (130) may output the correction image data moved as much as the correction value.
- FIG. 2 is a flow chart illustrating a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
- a method for correcting a distortion image using the system (100) for correcting a distortion image (hereinafter referred to as distortion image correction method, or simply as correction method) as in FIG. 1 will be described with reference to FIG. 2.
- a parameter necessary for calculating a correction value for correcting an image distorted by a curved surface is provided (S100).
- the parameter may be provided from the setting unit (110) in response to control of a user.
- the parameter may include a height of a pixel unit of a screen, a horizontal distance between a point of screen captured with each pixel of image and image output device, a shortest horizontal distance between the screen and the image output device, a vertical height of pixel unit between the image output device and a bottom surface of the screen, a size of screen, and curvature of screen, whereby any types of curved surfaces can be corrected by setting of these parameters.
- step S200 may calculate a correction value for coordinate conversion of the image data.
- a screen displayed on the imaginary vertical reference surface (Wf) is a normal screen when the image data outputted from the image output device is positioned at the imaginary vertical reference surface (Wf).
- the movement of the image data on the imaginary vertical reference surface corresponds to that of the image data displayed on an actual screen, whereby the movement of the image data on the screen can be obtained through the image data on the imaginary vertical reference surface.
- a step of outputting, by the correction unit (130), a correction image data is performed (S300).
- the step of S300 outputs the correction image data by moving the outside-inputted image data as much as a pixel corresponding to the correction value.
- FIG. 3 is an arrangement view of a screen and a projector for explaining a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention
- FIG. 4 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from a lateral surface
- FIG. 5 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from an upper surface.
- FIGS. 6 to 8 are views illustrating various examples of screens applicable by a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
- a screen (S) is of a curved surface having a predetermined curvature as in the present exemplary embodiment of the present invention
- an image output device (P) outputs an un-corrected image on the screen (S)
- a part of the un-corrected image may be not displayed on the screen (S) or may be generated with an image distortion due to curved surface even if displayed on the screen (S).
- the un-corrected image is an image based on a plain surface
- a plain surface such as an imaginary vertical reference surface (Wf)
- Wf imaginary vertical reference surface
- the un-corrected image is outputted to a curved surface screen (S)
- a part of the image may not be positioned on the screen (S), or may be distorted on the screen (S) even if ever displayed.
- a person who views an image cannot but view an image distorted by the curved surface because the image is displayed on a curved surface instead of a plain surface.
- FIGS. 3, 4 and 5 a method for calculating a correction value for providing a correction image to allow a person to view an image as displayed on a plain surface even if displayed on a curved surface screen, using FIGS. 3, 4 and 5, where the corrected value may be calculated by the correction value calculation unit (120) of FIG. 1.
- the imaginary vertical reference surface (Wf) and the screen (S) meet only at a center of width of the screen (S), and cannot meet at other points that the center.
- the screen (S) may alternatively take a convex shape to a direction of the installation surface as illustrated in FIGS. 6 and 7. Furthermore, as illustrated in FIG. 6, the screen (S) may simultaneously take a convex shape to a direction opposite to an installation surface (W) and take a convex shape to a direction of the installation surface (W).
- a horizontal distance (d2) between a point of screen (S) captured with each pixel of image and image output device (P), and a horizontal distance (d1) between an imaginary vertical reference surface (Wf) and the image output device (P) may be changed in response to change in the shape of the screen (S), and the correction of distortion is made by reflecting the changed screen (S) and shortest horizontal distance (d1) of the image output device (P), and the image distortion is corrected by reflecting the two horizontal distances (d1, d2), such that the method for correcting a distortion image using the system (100) proposed by the present invention can be applied regardless of what shape the screen (S) is curved.
- an image data positioned at a G1 point of the imaginary vertical reference surface (Wf) among the image data outputted from the image output device (P) to allow being displayed on a plain surface such as the imaginary vertical reference surface (Wf) can be positioned not on the screen (S), but on a first point (P1) which is an outside of the screen (S) because the screen (S) is of a curved surface.
- a first point (P1) which is an outside of the screen (S) because the screen (S) is of a curved surface.
- the present invention calculates the correction value using a horizontal distance (d2) between a point of screen (S) captured with each pixel of image and image output device (P), and a horizontal distance (d1) between an imaginary vertical reference surface (Wf) and the image output device (P), a height (hs)of a screen (S)(unit: pixel), and a vertical height (hop) of pixel unit between the image output device (P) and the screen (S).
- a movement distance for moving the image data from the first point (P1) of the imaginary vertical reference surface (Wf) to the second point (P2) may be calculated by pixel unit.
- a correction value (hc) defining how many pixels the image data are to be moved may be obtained by subtracting a correction reference value (hb) from the height (hs) of the screen (S), as expressed in the following Equation 1.
- hc is a correction value indicating the number of pixels to be moved
- hs is a height of pixel unit of screen
- hb is a correction reference value of pixel unit for calculating the correction value
- the correction reference value (hb) indicates at which numbered position a pixel is placed from a bottom surface of the screen (S), where the second point (P2) is where the image data is moved and positioned.
- the height (hs) of the screen (S) is formed with 1280 pixels sequentially having from zero to 1279 number from a bottom and the correction reference value (hb) is a 980th pixel, and then, the image data-positioned first point (P1) is a 1279th pixel, then, the correction value (hc) may be obtained in the following manner.
- the image data can be moved to the second point (G2) when the image data of a first point (G1) is moved as much as 299 pixels ⁇ correction value (hc) ⁇ which is a subtraction of 980 from 1279, because the correction reference value (hb) is a 980th pixel, and the image data-positioned first point (P1) is a 1279th pixel.
- the correction reference value (hb) may be obtained from the following Equation 2:
- d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device
- d1 is a horizontal distance between an imaginary vertical reference surface and the image output device
- hs is a height of a screen (unit: pixel)
- hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel).
- Equation 2 may be extracted from the following Equation 3 using a proportional formality:
- the correction value (hc) of the present invention may be obtained by subtracting a pixel ⁇ the correction reference value (hb) ⁇ in which the image data is to be moved from a pixel in which the movable image data is positioned.
- the correction reference value (hb) may be obtained by using a horizontal distance (d2) between a point of screen captured with each pixel of image and image output device, a horizontal distance (d1) between an imaginary vertical reference surface and the image output device, a height (hs)of a screen (S)(unit: pixel), and a vertical height (hop) of pixel unit between the image output device (P) and the screen (S).
- the image data outputted from the image output device (P) using the correction method according to the present invention is so outputted as to be positioned at the second point (G2) of imaginary vertical reference surface (Wf), whereby the image data actually displayed on the screen (S) is positioned at the second point (P2).
- a distance between a screen (S) and an image output device (P), and a height of the screen (S) and a height of the image output device (P) are used to calculate a correction value, such that the present invention can be applied to where the image output device (P) is placed at a position lower than the screen (S), and to wherever position the output device is positioned as well.
- a correction value is obtained based on a horizontal distance (d2) between a point of screen captured with each pixel of image and image output device, a horizontal distance (d1) between an imaginary vertical reference surface and the image output device, a height (hs)of a screen (S)(unit: pixel), and a vertical height (hop) of pixel unit between the image output device (P) and the screen (S) to allow calculating the correction value regardless of a shape of the screen (S) according to the present invention.
- the present invention has an industrial applicability in that a correction value is obtained based on an imaginary vertical reference surface formed by vertically extending a point of a screen of shortest distance from an image output device to allow calculating the correction value regardless of a shape of the screen, and a distance between a screen (S) and an image output device (P), and a height of the screen (S) and a height of the image output device (P) are used to calculate a correction value, such that the present invention can be applied to where the image output device (P) is placed at a position lower than the screen (S), and to wherever position the output device is positioned as well.
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Abstract
The present invention relates to a technology for correcting distortion image due to curved surface, and a system for correcting distortion image due to curved surface according to the present invention includes a setting unit configured to provide a parameter necessary for calculating a correction value for correcting an image distortion, a correction value calculation unit configured to calculate a correction value, which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit, and a correction unit configured to output a correction image data based on the correction value calculated by the correction value calculation unit and an inputted image data.
Description
The present invention relates to a system and method for correcting distortion image due to curved surface, and more particularly to a system for correcting distortion image due to curved surface configured to enable a desired image to be displayed on any curved surface by correcting an image distorted by various types of curved surfaces, and a method thereof.
Researches on distortion correction of an image outputted from an image output device are being briskly waged, and particularly researches are being actively progressed on a method for correcting distortion of an image generated on a curved surface in addition to a flat surface. Some of the methods to correct a distorted image generated by the curved surface include a coordinate mapping correction method using a camera, a correction method using a diameter of a curved surface and a correction method using an optical device.
The coordinate mapping correction method using a camera is a method in which an image configured to recognize a position of a coordinate such as a checked pattern is outputted to a screen by a projector, a distorted checked pattern is measured by a camera, and the image is corrected by calculating a distorted degree of the coordinate.
The correcting method using a diameter of a curved surface is a method in which pixel data is moved as much as an arc made based on an approximate radius of a curved surface to distort an image, and outputted to the curved surface to allow a correct image to be expressed on the curved surface. The correction method using an optical device is a method in which an optical device is interposed between a projector and a curved surface, where the optical device receives an image outputted from the projector, and the image is normally expressed by allowing the image to be outputted to the curved surface in a spot type set by the image.
However, those conventional correction methods are difficult to be realized in a hardware-based system, but may be a method applicable to software system and disadvantageously slow in reaction speed. Furthermore, those conventional correction methods may require a camera with a high resolution, resulting in generation of high cost for installation of high-cost camera. On top of that, when correction is made based on optical device, it is difficult to accurately correct the distortion, and the optical device is conventionally set to be applied to a particular screen, resulting in difficulty in flexible application to other curved surfaces.
Still furthermore, when an image is corrected only in consideration of radius of curved surface, an error with an actual distortion degree is great and it is impossible to cope with a position change of a projector.
As a proposition to solve the conventional technical difficulties thus mentioned, it is an object of the present invention to provide a system and method for correcting distortion image due to curved surface, configured to enable a desired image to be displayed on any curved surface by correcting an image distorted by various types of curved surfaces.
In one general object of the present invention, there is provided a system for correcting distortion image displayed on a curved screen installed on an installation surface by being outputted from an image output device, the system comprising:
a setting unit configured to provide a parameter necessary for calculating a correction value for correcting an image distortion;
a correction value calculation unit configured to calculate a correction value, which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit; and
a correction unit configured to output a correction image data based on the correction value calculated by the correction value calculation unit and an inputted image data.
Preferably, but not necessarily, the parameter may include a horizontal distance between a point of screen captured with each pixel of image and image output device, a horizontal distance between the imaginary vertical reference surface and the image output device, a height of pixel unit of the screen and a vertical height of pixel unit between the image output device and the screen.
Preferably, but not necessarily, the correction value calculation unit may calculate the correction value using the following Equation 1:
[Equation 1]
where, hc is a correction value, hs is a height of pixel unit of screen, and hb is a correction reference value of pixel unit for calculating the correction value.
Preferably, but not necessarily, the correction reference value may be a position on the imaginary vertical reference surface corresponding to that of an image data desired to be displayed on the screen, and calculated by using the following Equation 2:
[Equation 2]
where, d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device, d1 is a horizontal distance between an imaginary vertical reference surface and the image output device, hs is a height of a screen (unit: pixel), and hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel).
Preferably, but not necessarily, the correction unit may be configured to output the correction image data by moving the inputted image data as much as a pixel corresponding to the correction value.
In another general aspect of the present invention, there is provided a method for correcting a distortion image displayed on a curved surface installed on an installation surface by being outputted from an image output device, the method comprising:
providing a parameter necessary for calculating a correction value;
calculating a correction value, which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit; and
outputting a correction image data based on the correction value calculated by the correction value calculation step and an inputted image data.
Preferably, but not necessarily, the parameter may include a horizontal distance between a point of screen captured with each pixel of image and image output device, a horizontal distance between the imaginary vertical reference surface and the image output device, a height of pixel unit of the screen and a vertical height of pixel unit between the image output device and the screen.
Preferably, but not necessarily, the correction value calculation unit may calculate the correction value using the following Equation 1:
[Equation 1]
where, hc is a correction value, hs is a height of pixel unit of screen, and hb is a correction reference value of pixel unit for calculating the correction value.
Preferably, but not necessarily, the correction reference value may be a position on the imaginary vertical reference surface corresponding to that of an image data desired to be displayed on the screen, and calculated by using the following Equation 2:
[Equation 2]
where, d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device, d1 is a horizontal distance between an imaginary vertical reference surface and the image output device, hs is a height of a screen (unit: pixel), and hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel).
Preferably, but not necessarily, the correction step may include outputting the correction image data by moving the inputted image data as much as a pixel corresponding to the correction value.
The present invention has an advantageous effect in that a correction value is obtained based on an imaginary vertical reference surface formed by vertically extending a point of a screen of shortest distance from an image output device to allow calculating the correction value regardless of a shape of the screen.
Another advantageous effect is that a distance between a screen (S) and an image output device (P), and a height of the screen (S) and a height of the image output device (P) are used to calculate a correction value, such that the present invention can be applied to where the image output device (P) is placed at a position lower than the screen (S), and to wherever position the output device is positioned as well.
FIG. 1 is a block diagram illustrating a system (100) for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
FIG. 2 is a flow chart illustrating a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
FIG. 3 is an arrangement view of a screen and a projector for explaining a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
FIG. 4 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from a lateral surface.
FIG. 5 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from an upper surface
FIGS. 6 to 8 are views illustrating various examples of screens applicable by a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
Now, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Features and advantages of the exemplary embodiments will be or will become apparent to one of ordinary skill in the art upon examination of the following figures and detailed description
In describing the present disclosure, certain layers, sizes, shapes, components or features may be exaggerated for clarity and convenience. Accordingly, the meaning of specific terms or words used in the specification and claims should not be limited to the literal or commonly employed sense, but should be construed or may be different in accordance with the intention of a user or an operator and customary usages. Therefore, the definition of the specific terms or words should be based on the contents across the specification.
FIG. 1 is a block diagram illustrating a system (100) for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
Referring to FIG. 1, the system (100) for correcting a distortion image due to curved surface (hereinafter referred to as curved surface distortion correction system, or simply as system) according to an exemplary embodiment of the present invention may include a setting unit (110), a correction value calculation unit (120) and a correction unit (130). It should be apparent that the system (100) may further include other additional configurations for correcting an image.
At this time, the curved surface distortion correction according to the system (100) for correcting a distortion image may be realized by correction of left/right keystone corrections based on a point left/right images are captured, where the system (100) may be so configured as to horizontally correct the curved surface distortion image.
First, the setting unit (110) is so configured as to provide a parameter necessary for the correction value calculation unit (120) to calculate a correction value. At this time, the parameter may be a height of a pixel unit of a screen, a horizontal distance between an image output device and a screen-installed installation surface, a shortest horizontal distance between the screen and the image output device, and a vertical height of pixel unit between the image output device and a bottom surface of the screen.
Furthermore, the parameter may further include a size of a screen and a curvature of the screen, whereby any types of curved surfaces can be corrected by setting of these parameters.
The correction value calculation unit (120) may calculate a correction value based on the parameter provided by the setting unit (110). At this time, a method for calculating the correction value will be described later with reference to FIGS. 2 to 4.
The correction unit (130) may output a correction image data by correcting an inputted image data in response to a correction value calculated by the correction value calculation unit (120). At this time, the correction unit (130) may output the correction image data moved as much as the correction value.
FIG. 2 is a flow chart illustrating a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
A method for correcting a distortion image using the system (100) for correcting a distortion image (hereinafter referred to as distortion image correction method, or simply as correction method) as in FIG. 1 will be described with reference to FIG. 2.
First, a parameter necessary for calculating a correction value for correcting an image distorted by a curved surface is provided (S100). At this time, the parameter may be provided from the setting unit (110) in response to control of a user.
The parameter may include a height of a pixel unit of a screen, a horizontal distance between a point of screen captured with each pixel of image and image output device, a shortest horizontal distance between the screen and the image output device, a vertical height of pixel unit between the image output device and a bottom surface of the screen, a size of screen, and curvature of screen, whereby any types of curved surfaces can be corrected by setting of these parameters.
Successively, based on the parameter set up by the step S100, a step is performed of calculating a correction value, which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit (S200). That is, step S200 may calculate a correction value for coordinate conversion of the image data.
At this time, a screen displayed on the imaginary vertical reference surface (Wf) is a normal screen when the image data outputted from the image output device is positioned at the imaginary vertical reference surface (Wf).
Meantime, the movement of the image data on the imaginary vertical reference surface corresponds to that of the image data displayed on an actual screen, whereby the movement of the image data on the screen can be obtained through the image data on the imaginary vertical reference surface.
Next, based on the correction value calculated by S200 and an image data inputted from outside, a step of outputting, by the correction unit (130), a correction image data is performed (S300). At this time, the step of S300 outputs the correction image data by moving the outside-inputted image data as much as a pixel corresponding to the correction value.
FIG. 3 is an arrangement view of a screen and a projector for explaining a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention, and FIG. 4 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from a lateral surface, and FIG. 5 is a status view of an arrangement of a screen and a projector of FIG. 3 viewed from an upper surface. FIGS. 6 to 8 are views illustrating various examples of screens applicable by a method for correcting a distortion image due to curved surface according to an exemplary embodiment of the present invention.
When a screen (S) is of a curved surface having a predetermined curvature as in the present exemplary embodiment of the present invention, and when an image output device (P) outputs an un-corrected image on the screen (S), a part of the un-corrected image may be not displayed on the screen (S) or may be generated with an image distortion due to curved surface even if displayed on the screen (S).
That is, the un-corrected image is an image based on a plain surface, and when the un-corrected image is outputted on a plain surface such as an imaginary vertical reference surface (Wf), it may be normally displayed on the plain surface. However, when the un-corrected image is outputted to a curved surface screen (S), a part of the image may not be positioned on the screen (S), or may be distorted on the screen (S) even if ever displayed. Furthermore, a person who views an image cannot but view an image distorted by the curved surface because the image is displayed on a curved surface instead of a plain surface.
Now, a method for calculating a correction value for providing a correction image to allow a person to view an image as displayed on a plain surface even if displayed on a curved surface screen, using FIGS. 3, 4 and 5, where the corrected value may be calculated by the correction value calculation unit (120) of FIG. 1.
The correction value according to an exemplary embodiment of the present invention is
calculated based on an imaginary vertical reference surface (Wf) in which a point of the screen (S) positioned at a shortest distance from the image output device (P) is vertically extended, a horizontal distance (d2) between a point of screen (S) captured with each pixel of image and image output device (P), and a horizontal distance (d1) between an imaginary vertical reference surface (Wf) and the image output device (P).
At this time, because the screen (S) is of a curved surface having a curvature, the imaginary vertical reference surface (Wf) and the screen (S) meet only at a center of width of the screen (S), and cannot meet at other points that the center.
Although the exemplary embodiment of the present invention has illustrated that the screen (S) takes a convex shape to a direction opposite to an installation surface (W) installed with the screen (S), the screen (S) may alternatively take a convex shape to a direction of the installation surface as illustrated in FIGS. 6 and 7. Furthermore, as illustrated in FIG. 6, the screen (S) may simultaneously take a convex shape to a direction opposite to an installation surface (W) and take a convex shape to a direction of the installation surface (W).
That is, according to the method for correcting a distortion image using the system (100) proposed by the present invention, a horizontal distance (d2) between a point of screen (S) captured with each pixel of image and image output device (P), and a horizontal distance (d1) between an imaginary vertical reference surface (Wf) and the image output device (P) may be changed in response to change in the shape of the screen (S), and the correction of distortion is made by reflecting the changed screen (S) and shortest horizontal distance (d1) of the image output device (P), and the image distortion is corrected by reflecting the two horizontal distances (d1, d2), such that the method for correcting a distortion image using the system (100) proposed by the present invention can be applied regardless of what shape the screen (S) is curved.
Meantime, an image data positioned at a G1 point of the imaginary vertical reference surface (Wf) among the image data outputted from the image output device (P) to allow being displayed on a plain surface such as the imaginary vertical reference surface (Wf) can be positioned not on the screen (S), but on a first point (P1) which is an outside of the screen (S) because the screen (S) is of a curved surface. Thus, in order to place the image data positioned at the first point (P1) there is a need of moving a relevant image data to a second point (P2).
It is difficult to directly obtain a correction value for moving the image data positioned at the first point (P1) to the second point (P2), such that the present invention calculates the correction value using a horizontal distance (d2) between a point of screen (S) captured with each pixel of image and image output device (P), and a horizontal distance (d1) between an imaginary vertical reference surface (Wf) and the image output device (P), a height (hs)of a screen (S)(unit: pixel), and a vertical height (hop) of pixel unit between the image output device (P) and the screen (S).
That is, when moving the image data positioned at the first point (P1) to the second point (P2), the G1 point of the imaginary vertical reference surface (Wf) is moved to the second point (P2) of the imaginary vertical reference surface (Wf) in response thereto.
Thus, when the image data on the imaginary vertical reference surface (Wf) is moved from the first point (G1) to the second point (G2), the image data on the second point (P) outside of the screen (S) is resultantly positioned at the second point (P2), whereby the image data positioned outside of the screen (S) can be positioned on the screen based on the position movement of the image data on the imaginary vertical reference surface (Wf).
Meantime, a movement distance for moving the image data from the first point (P1) of the imaginary vertical reference surface (Wf) to the second point (P2) may be calculated by pixel unit. At this time, a correction value (hc) defining how many pixels the image data are to be moved may be obtained by subtracting a correction reference value (hb) from the height (hs) of the screen (S), as expressed in the following Equation 1.
[Equation 1]
where, hc is a correction value indicating the number of pixels to be moved, hs is a height of pixel unit of screen, and hb is a correction reference value of pixel unit for calculating the correction value.
Meantime, the correction reference value (hb) indicates at which numbered position a pixel is placed from a bottom surface of the screen (S), where the second point (P2) is where the image data is moved and positioned.
For example, imagine that the height (hs) of the screen (S) is formed with 1280 pixels sequentially having from zero to 1279 number from a bottom and the correction reference value (hb) is a 980th pixel, and then, the image data-positioned first point (P1) is a 1279th pixel, then, the correction value (hc) may be obtained in the following manner.
First, the image data can be moved to the second point (G2) when the image data of a first point (G1) is moved as much as 299 pixels {correction value (hc)} which is a subtraction of 980 from 1279, because the correction reference value (hb) is a 980th pixel, and the image data-positioned first point (P1) is a 1279th pixel.
Meantime, the correction reference value (hb) may be obtained from the following Equation 2:
[Equation 2]
where, d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device, d1 is a horizontal distance between an imaginary vertical reference surface and the image output device, hs is a height of a screen (unit: pixel), and hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel).
At this time, the Equation 2 may be extracted from the following Equation 3 using a proportional formality:
[Equation 3]
That is, the correction value (hc) of the present invention may be obtained by subtracting a pixel {the correction reference value (hb)} in which the image data is to be moved from a pixel in which the movable image data is positioned.
Furthermore, the correction reference value (hb) may be obtained by using a horizontal distance (d2) between a point of screen captured with each pixel of image and image output device, a horizontal distance (d1) between an imaginary vertical reference surface and the image output device, a height (hs)of a screen (S)(unit: pixel), and a vertical height (hop) of pixel unit between the image output device (P) and the screen (S).
Thus, the image data outputted from the image output device (P) using the correction method according to the present invention is so outputted as to be positioned at the second point (G2) of imaginary vertical reference surface (Wf), whereby the image data actually displayed on the screen (S) is positioned at the second point (P2).
According to the present invention, a distance between a screen (S) and an image output device (P), and a height of the screen (S) and a height of the image output device (P) are used to calculate a correction value, such that the present invention can be applied to where the image output device (P) is placed at a position lower than the screen (S), and to wherever position the output device is positioned as well.
Furthermore, a correction value is obtained based on a horizontal distance (d2) between a point of screen captured with each pixel of image and image output device, a horizontal distance (d1) between an imaginary vertical reference surface and the image output device, a height (hs)of a screen (S)(unit: pixel), and a vertical height (hop) of pixel unit between the image output device (P) and the screen (S) to allow calculating the correction value regardless of a shape of the screen (S) according to the present invention.
Although the system and method for correcting distortion image due to curved surface according to the present invention have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Thus, the above-mentioned exemplary embodiments and drawings according to the present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Hence, it is intended that embodiments of the present invention may cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents. Thus, the invention is not intended to limit the examples described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The present invention has an industrial applicability in that a correction value is obtained based on an imaginary vertical reference surface formed by vertically extending a point of a screen of shortest distance from an image output device to allow calculating the correction value regardless of a shape of the screen, and a distance between a screen (S) and an image output device (P), and a height of the screen (S) and a height of the image output device (P) are used to calculate a correction value, such that the present invention can be applied to where the image output device (P) is placed at a position lower than the screen (S), and to wherever position the output device is positioned as well.
Claims (10)
- A system for correcting distortion image displayed on a curved screen installed on an installation surface by being outputted from an image output device, the system comprising:a setting unit configured to provide a parameter necessary for calculating a correction value for correcting an image distortion;a correction value calculation unit configured to calculate a correction value, which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit; anda correction unit configured to output a correction image data based on the correction value calculated by the correction value calculation unit and an inputted image data.
- The system of claim 1, wherein the parameter includes a horizontal distance between a point of screen captured with each pixel of image and image output device, a horizontal distance between the imaginary vertical reference surface and the image output device, a height of pixel unit of the screen and a vertical height of pixel unit between the image output device and the screen.
- The system of claim 1, wherein the correction value calculation unit calculates the correction value using the following Equation 1:[Equation 1]
where, hc is a correction value, hs is a height of pixel unit of screen, and hb is a correction reference value of pixel unit for calculating the correction value. - The system of claim 3, wherein the correction reference value is a position on the imaginary vertical reference surface corresponding to that of an image data desired to be displayed on the screen, and calculated by using the following Equation 2:[Equation 2]
where, d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device, d1 is a horizontal distance between an imaginary vertical reference surface and the image output device, hs is a height of a screen (unit: pixel), and hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel). - The system of claim 1, wherein the correction unit is configured to output the correction image data by moving the inputted image data as much as a pixel corresponding to the correction value.
- A method for correcting a distortion image displayed on a curved surface installed on an installation surface by being outputted from an image output device, the method comprising:providing a parameter necessary for calculating a correction value;calculating a correction value, which is the number of pixels configured to move, on an imaginary vertical reference surface, an image data positioned at the imaginary vertical reference surface formed by vertically extending a point of a screen positioned at a shortest distance from the image output device, based on the parameter provided by the setting unit; andoutputting a correction image data based on the correction value calculated by the correction value calculation step and an inputted image data.
- The method of claim 6, wherein the parameter includes a horizontal distance between a point of screen captured with each pixel of image and image output device, a horizontal distance between the imaginary vertical reference surface and the image output device, a height of pixel unit of the screen and a vertical height of pixel unit between the image output device and the screen.
- The method of claim 6, wherein the correction value calculation unit calculates the correction value using the following Equation 1:[Equation 1]
where, hc is a correction value, hs is a height of pixel unit of screen, and hb is a correction reference value of pixel unit for calculating the correction value. - The method of claim 7, wherein the correction reference value is a position on the imaginary vertical reference surface corresponding to that of an image data desired to be displayed on the screen, and calculated by using the following Equation 2:[Equation 2]
where, d2 is a horizontal distance between a point of screen captured with each pixel of image and image output device, d1 is a horizontal distance between an imaginary vertical reference surface and the image output device, hs is a height of a screen (unit: pixel), and hop is a vertical height between a center of the image output device and a bottom surface of the screen (unit; pixel). - The method of claim 1, wherein the correction step includes outputting the correction image data by moving the inputted image data as much as a pixel corresponding to the correction value.
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| KR10-2015-0060053 | 2015-04-28 | ||
| KR1020150060053A KR102356934B1 (en) | 2014-04-29 | 2015-04-28 | System and method for correcting distortion image due to curved surface |
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| WO2015167262A1 true WO2015167262A1 (en) | 2015-11-05 |
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