CN102271237A - Projection device and method thereof for correcting trapezoidal distortion - Google Patents
Projection device and method thereof for correcting trapezoidal distortion Download PDFInfo
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- CN102271237A CN102271237A CN2011100457263A CN201110045726A CN102271237A CN 102271237 A CN102271237 A CN 102271237A CN 2011100457263 A CN2011100457263 A CN 2011100457263A CN 201110045726 A CN201110045726 A CN 201110045726A CN 102271237 A CN102271237 A CN 102271237A
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Abstract
The invention provides a projection device comprising an angle sensing unit and a processing unit, wherein the angle sensing unit is used for sensing the tilt of the projection device and outputting a voltage value; and the processing is used for determining the tilt angle of the projection device according to the voltage value, calculating the ratio of the upper side length to the lower side length of a projection area projected on a projection screen by the projection device according to the tilt angle and the projection angle of the projection device, determining a corrective parameter according to the calculated ratio, and adjusting a non-projected image in the projection device according to the corrective parameter, so that the ratio of the upper side length to the lower side length is the corrective parameter. The invention also provides a method for correcting trapezoidal distortion, and trapezoidal distortion can be corrected by using the projection device and the method.
Description
Technical field
The present invention relates to the method for a kind of projection arrangement and rectification trapezoidal distortion.
Background technology
In the daily use of projection arrangement, the position of projection arrangement should be as far as possible with the projection screen picture that could guarantee to be projected on the projection screen that meets at right angles be rectangle.If but can not guarantee the vertical of the position of projection arrangement and projection screen, the picture that is projected on the projection screen will produce trapezoidal distortion.Like this watching of user brought inconvenience.
Summary of the invention
In view of this, be necessary to provide a kind of projection arrangement, can correct trapezoidal distortion.Also be necessary to provide a kind of method of correcting trapezoidal distortion.
A kind of projection arrangement, this projection arrangement comprises: an angle sensing unit is used for the inclination of sensing projection arrangement, and exports a magnitude of voltage; One processing unit, determine the angle of inclination of this projection arrangement according to this magnitude of voltage, projection angle according to this angle of inclination and projection arrangement calculates the ratio that this projection arrangement is incident upon the last length of side of the view field on the projection screen and descends the length of side, and determine a corrected parameter according to the ratio of being calculated, adjust the image before the projection in the projection arrangement by this corrected parameter, make the top of this image and following ratio be this corrected parameter.
A kind of method of correcting trapezoidal distortion, this method is applied to a projection arrangement, this projection arrangement comprises an angle sensing unit, this angle sensing unit is used for the inclination of this projection arrangement of sensing, and export a magnitude of voltage, this method also comprises: the angle of inclination of determining this projection arrangement according to this magnitude of voltage; Calculate this projection arrangement according to the projection angle of this angle of inclination and projection arrangement and be incident upon the last length of side of the view field on the projection screen and the ratio of the following length of side; The last length of side that is incident upon the view field on the projection screen by this projection arrangement is calculated corrected parameter with the ratio of the following length of side; Be out of shape this image accordingly by this corrected parameter, make the last length of side of this image and the ratio of the following length of side be this corrected parameter.
The inclination of angle sensing unit sensing projection arrangement is also exported a magnitude of voltage, this processing unit calculates the angle of inclination of this projection arrangement according to this magnitude of voltage, this processing unit calculates the ratio that this projection arrangement is incident upon the last length of side on the projection screen and the following length of side according to the angle of inclination of this projection arrangement, and by this ratio calculating corrected parameter, this treats projects images by this corrected parameter correction.Thereby realize revising trapezoidal distortion.
Description of drawings
Fig. 1 is a projection arrangement block diagram in an embodiment of the present invention.
Fig. 2 is the voltage of gravity sensor output as shown in Figure 1 and the corresponding relation figure of angle.
Fig. 3 is the calculating schematic diagram that as shown in Figure 1 projection arrangement does not have the camera lens translation functions.
Fig. 4 is the calculating principle schematic that as shown in Figure 1 projection arrangement does not have the camera lens translation functions.
Fig. 5 is the calculating schematic diagram that as shown in Figure 1 projection arrangement has the camera lens translation functions.
Fig. 6 is the calculating principle schematic that as shown in Figure 1 projection arrangement has the camera lens translation functions.
Fig. 7 is that projection arrangement is corrected the trapezoidal distortion method flow diagram in an embodiment of the present invention.
The main element symbol description
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100 |
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10 |
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20 |
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30 |
Embodiment
Please refer to Fig. 1, be projection arrangement 100 block diagrams of an embodiment of the present invention.This projection arrangement 100 comprises an angle sensing unit 10, a memory cell 20 and a processing unit 30.
This angle sensing unit 10 is used for the angle of sensing projection arrangement 100 and horizontal direction.In the present embodiment, this angle sensing unit 10 is gravity sensor (G-sensor), and when the angle of this gravity sensor changed, the gravity direction difference that this gravity sensor is responded to promptly had different voltage output.The scope of this gravity sensor angle measurement is spent between 90 degree-90, and the pairing output voltage values scope of this angle measurement scope is 1.3 volts to 3.7 volts.
Store the angle of this gravity sensor measurement and the corresponding relation between the output voltage in this memory cell 20.In the present embodiment, angle and the corresponding relation between the output voltage that this gravity sensor measures are represented with figure shown in Figure 2.
This processing unit 30 is electrically connected with this angle sensing unit 10.The angle of inclination angle of horizontal direction (promptly with) of this projection arrangement 100 is determined in this processing unit 30 response users' operation.In the present embodiment, this processing unit 30 is at first determined the magnitude of voltage of gravity sensor output, then angle that measures according to the gravity sensor of storage in the magnitude of voltage of this gravity sensor output and this memory cell 20 and the corresponding relation between the output voltage angle of inclination of determining this projection arrangement 100.
This processing unit 30 calculates this projection arrangement 100 according to the projection angle of the angle of inclination of projection arrangement 100 and projection arrangement 100 and is incident upon the length of side and following length of side ratio on the image on the projection screen, and calculate a corrected parameter according to this ratio, this corrected parameter is incident upon the inverse of the length of side and following length of side ratio on the image on the projection screen for this projection arrangement 100, and the calculating of this corrected parameter be please refer to Fig. 3 to Fig. 6.After corrected parameter is determined, then processing unit 30 is adjusted the preceding image of projection in the projection arrangement 100 according to this corrected parameter, it is this corrected parameter that this anamorphose is become to go up following ratio, and this image is trapezoidal, thereby projecting the top of the image on the projection screen and following ratio is 1, has realized trapezoidal correction.For example, be 1: 2 when calculating this corrected parameter, then to according to this corrected parameter the preceding image of projection in the projection arrangement 100 being adjusted, making the ratio of the bottom and upper segment of the preceding image of projection arrangement projection is 1: 2.
Fig. 3 and Fig. 4 calculate the schematic diagram that this projection arrangement 100 is incident upon the method for the last length of side on the projection screen and following length of side ratio when not having the camera lens translation functions for projection arrangement 100.When this projection arrangement 100 did not have the camera lens translation functions, the view field that this projection arrangement 100 is incident upon projection screen was distributed in the upper and lower of projection arrangement 100 with respect to this projection arrangement 100.As Fig. 3, when this projection arrangement 100 has the inclination angle, since this projection arrangement 100 be incident upon projection screen the top two summits respectively with this projection arrangement 100 between between formed two limit X angle with and two summits of bottom and this projection arrangement 100 between angle between formed two limit Y consistent, can draw then that this projection arrangement 100 is incident upon the last length of side Z of the view field on the projection screen and ratio that this projection arrangement 100 is incident upon the following length of side Z ' of the view field on the projection screen is two summits and this projection arrangement 100 formed side ratio X/Y that this projection arrangement 100 is incident upon the same side of view field.Please refer to Fig. 4, establishing these projection arrangement 100 projection angles is 2 θ, and the projection half-angle is θ, and the distance between projection arrangement and this projection screen is L, and the angle of inclination of the projection arrangement 100 of these angle sensing unit 10 sensings is β.If the length of side that this projection arrangement 100 projects is respectively X and Y, ((θ-β), corrected parameter is so: Y/X=(L/cos (θ-β))/(L/cos (θ+β))=cos (θ+β)/cos (θ-β) for θ+β) and Y=L/cos then can to get X=L/cos.
Fig. 5 and Fig. 6 calculate the schematic diagram that this projection arrangement 100 is incident upon the method for the last length of side on the projection screen and following length of side ratio when having the camera lens translation functions for projection arrangement 100.When this projection arrangement 100 had the camera lens translation functions, this projection arrangement 100 was incident upon the view field of projection screen with respect to projection arrangement 100, above projection arrangement 100.Please refer to Fig. 5, when this projection arrangement 100 has the inclination angle, be incident upon projection screen the top two summits respectively with this projection arrangement 100 between between formed two limit X angle and and following two summits respectively and between this projection arrangement 100 angle between formed two limit Y consistent, then can draw this projection arrangement 100 and be incident upon the last length of side Z of the view field on the projection screen and ratio that this projection arrangement 100 is incident upon the following length of side Z ' of the view field on the projection screen and be two summits of same side that this projection arrangement 100 is incident upon view field formed side ratio X/Y respectively and between this projection arrangement 100.Please refer to Fig. 6, if these projection arrangement 100 crevice projection angles are 2 θ, the angle of inclination of the projection arrangement 100 of these angle sensing unit 10 sensings is β, then this projection arrangement 100 be incident upon view field two summits of same side respectively and between this projection arrangement 100 the formed length of side be respectively X=L/cos (2 θ+β) and Y=L/cos β, then corrected parameter be: Y/X=(L/cos β)/(L/cos (2 θ+β))=cos (2 θ+β)/cos β.
Please refer to Fig. 7, for projection arrangement in an embodiment of the present invention 100 is corrected the trapezoidal distortion method flow diagram.
In step S701, this processing unit 30 is determined the angle of inclination of this projection arrangement 100.In the present embodiment, the angle that measures according to the gravity sensor of storage in the magnitude of voltage of this gravity sensor output and this memory cell 20 of this processing unit 30 and the corresponding relation between the output voltage angle of inclination of determining this projection arrangement 100.
In step S702, this processing unit 30 calculates this projection arrangement 100 according to the projection angle of this projection arrangement of angle of inclination of this projection arrangement and is incident upon the last length of side of the view field on the projection screen and the ratio that this projection arrangement 100 is incident upon the following length of side of the view field on the projection screen.
In step S703, this processing unit 30 calculates this corrected parameter according to the ratio that this projection arrangement 100 is incident upon the last length of side on the projection screen and the following length of side.This corrected parameter is the inverse of the ratio of the last length of side of projected area and the following length of side.
In step S704, this processing unit 30 is out of shape this image accordingly according to this corrected parameter, make the top of this image and following ratio be this corrected parameter, and this image is trapezoidal.
Those skilled in the art will be appreciated that; above execution mode only is to be used for illustrating the present invention; and be not to be used as limitation of the invention; as long as within connotation scope of the present invention, appropriate change and the variation that above embodiment did all dropped within the scope of protection of present invention.
Claims (10)
1. a projection arrangement is characterized in that, this projection arrangement comprises:
One angle sensing unit is used for the inclination of sensing projection arrangement, and exports a magnitude of voltage;
One processing unit, determine the angle of inclination of this projection arrangement according to this magnitude of voltage, projection angle according to this angle of inclination and projection arrangement calculates the ratio that this projection arrangement is incident upon the last length of side of the view field on the projection screen and descends the length of side, and determine a corrected parameter according to the ratio of being calculated, adjust the image before the projection in the projection arrangement by this corrected parameter, make the top of this image and following ratio be this corrected parameter.
2. projection arrangement as claimed in claim 1 is characterized in that: this angle sensing unit is a gravity sensor.
3. projection arrangement as claimed in claim 2, it is characterized in that: this projection arrangement also comprises a memory cell, store angle that a gravity sensor measures and the corresponding relation between the output voltage in this memory cell, the angle of inclination that this processing unit calculates this projection arrangement according to magnitude of voltage and this corresponding relation of this gravity sensor output.
4. projection arrangement as claimed in claim 1 is characterized in that, should " calculate this projection arrangement and be incident upon the last length of side of the view field on the projection screen and the ratio of the following length of side " to be specially:
When this projection arrangement did not have the camera lens translation functions, then this projection arrangement was incident upon the ratio X/Y=cos (θ-β)/cos (θ+β) of the last length of side Yu the following length of side of the view field on the projection screen;
When this projection arrangement has the camera lens translation functions, then this projection arrangement be incident upon the last length of side Yu the following length of side of the view field on the projection screen ratio X/Y=cos β/cos (2 θ+β),
Wherein, X and Y are respectively two formed length of sides in summit that when projection arrangement has inclination angle projection arrangement is incident upon the same side of view field, and θ is the projection half-angle, and β is the angle of inclination of projection arrangement.
5. projection arrangement as claimed in claim 1 is characterized in that: this corrected parameter is that projection arrangement is incident upon the last length of side of the view field on the projection screen and reaches the inverse of the ratio of the length of side down.
6. method of correcting trapezoidal distortion, this method is applied to a projection arrangement, and this projection arrangement comprises an angle sensing unit, and this angle sensing unit is used for the inclination of this projection arrangement of sensing, and exports a magnitude of voltage, it is characterized in that, and this method also comprises:
Determine the angle of inclination of this projection arrangement according to this magnitude of voltage;
Calculate this projection arrangement according to the projection angle of this angle of inclination and projection arrangement and be incident upon the last length of side of the view field on the projection screen and the ratio of the following length of side;
The last length of side that is incident upon the view field on the projection screen by this projection arrangement is calculated corrected parameter with the ratio of the following length of side;
Be out of shape this image accordingly by this corrected parameter, make the last length of side of this image and the ratio of the following length of side be this corrected parameter.
7. the method for rectification trapezoidal distortion as claimed in claim 6 is characterized in that: this angle sensing unit is a gravity sensor.
8. the method for rectification trapezoidal distortion as claimed in claim 7, it is characterized in that: this projection arrangement also comprises a memory cell, store the angle of gravity sensor measurement and the corresponding relation between the output voltage in this memory cell, it is the angle of inclination of determining this projection arrangement according to magnitude of voltage and this corresponding relation of this gravity sensor output that described step " is determined the angle of inclination of this projection arrangement ".
9. the method for rectification trapezoidal distortion as claimed in claim 6 is characterized in that, this step " is calculated this projection arrangement and is incident upon the last length of side of the view field on the projection screen and the ratio of the following length of side " and is specially:
When this projection arrangement did not have the camera lens translation functions, then this projection arrangement was incident upon the ratio X/Y=cos (θ-β)/cos (θ+β) of the last length of side Yu the following length of side of the view field on the projection screen;
When this projection arrangement has the camera lens translation functions, then this projection arrangement be incident upon the last length of side Yu the following length of side of the view field on the projection screen ratio X/Y=cos β/cos (2 θ+β),
Wherein, X and Y be respectively projection arrangement when the inclination angle is arranged projection arrangement be incident upon two formed length of sides in summit of the same side of view field, θ is the projection half-angle, β is the angle of inclination of projection arrangement.
10. the method for rectification trapezoidal distortion as claimed in claim 6 is characterized in that: this corrected parameter is that projection arrangement is incident upon the last length of side of the view field on the projection screen and reaches the inverse of the ratio of the length of side down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100457263A CN102271237A (en) | 2011-02-25 | 2011-02-25 | Projection device and method thereof for correcting trapezoidal distortion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100457263A CN102271237A (en) | 2011-02-25 | 2011-02-25 | Projection device and method thereof for correcting trapezoidal distortion |
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| CN102271237A true CN102271237A (en) | 2011-12-07 |
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| CN2011100457263A Pending CN102271237A (en) | 2011-02-25 | 2011-02-25 | Projection device and method thereof for correcting trapezoidal distortion |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102998885A (en) * | 2012-11-20 | 2013-03-27 | 芜湖雅图数字视频技术有限公司 | Method for rectifying distortion of projected images of projector |
| CN104349095A (en) * | 2013-08-09 | 2015-02-11 | 联想(北京)有限公司 | Image regulating method, image regulating device and electronic equipment |
| CN104796651A (en) * | 2015-03-31 | 2015-07-22 | 青岛海信电器股份有限公司 | Projection image calibration method and projection equipment |
| CN104850246A (en) * | 2014-02-19 | 2015-08-19 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN105049762A (en) * | 2015-07-09 | 2015-11-11 | 山西寰烁电子科技股份有限公司 | Projection system |
| CN106331666A (en) * | 2015-07-03 | 2017-01-11 | 中兴通讯股份有限公司 | Trapezoidal projection terminal correction method and device, and projection terminal |
| CN107147888A (en) * | 2017-05-16 | 2017-09-08 | 深圳市火乐科技发展有限公司 | One kind corrects distortion methods and device automatically using graph processing chips |
| CN107835399A (en) * | 2017-10-31 | 2018-03-23 | 潍坊歌尔电子有限公司 | The method, apparatus and projector equipment of a kind of projection correction |
| CN108121232A (en) * | 2016-11-28 | 2018-06-05 | 英业达科技有限公司 | Projection arrangement and projecting method |
| CN109308684A (en) * | 2017-07-27 | 2019-02-05 | 成都理想境界科技有限公司 | A kind of image skew correction method and computer readable storage medium |
| CN110766615A (en) * | 2019-09-09 | 2020-02-07 | 北京美院帮网络科技有限公司 | Picture correction method, device, terminal and computer readable storage medium |
| WO2020119633A1 (en) * | 2018-12-12 | 2020-06-18 | 中国科学院深圳先进技术研究院 | Automatic correction method and system for projected picture |
| CN114339172A (en) * | 2021-12-14 | 2022-04-12 | 青岛信芯微电子科技股份有限公司 | Projection correction method and device, projection equipment, chip and medium |
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Cited By (22)
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| CN102998885B (en) * | 2012-11-20 | 2015-09-02 | 芜湖市安曼特微显示科技有限公司 | To the method for projector image distortion correction |
| CN102998885A (en) * | 2012-11-20 | 2013-03-27 | 芜湖雅图数字视频技术有限公司 | Method for rectifying distortion of projected images of projector |
| CN104349095A (en) * | 2013-08-09 | 2015-02-11 | 联想(北京)有限公司 | Image regulating method, image regulating device and electronic equipment |
| CN104349095B (en) * | 2013-08-09 | 2017-08-29 | 联想(北京)有限公司 | A kind of image adjusting method, device and electronic equipment |
| CN104850246A (en) * | 2014-02-19 | 2015-08-19 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104850246B (en) * | 2014-02-19 | 2018-12-14 | 联想(北京)有限公司 | The method and electronic equipment of information processing |
| CN104796651B (en) * | 2015-03-31 | 2018-08-21 | 青岛海信电器股份有限公司 | A kind of projected image calibration method and projection device |
| CN104796651A (en) * | 2015-03-31 | 2015-07-22 | 青岛海信电器股份有限公司 | Projection image calibration method and projection equipment |
| CN106331666A (en) * | 2015-07-03 | 2017-01-11 | 中兴通讯股份有限公司 | Trapezoidal projection terminal correction method and device, and projection terminal |
| CN106331666B (en) * | 2015-07-03 | 2020-02-07 | 中兴通讯股份有限公司 | Projection terminal trapezoidal correction method and device and projection terminal |
| CN105049762A (en) * | 2015-07-09 | 2015-11-11 | 山西寰烁电子科技股份有限公司 | Projection system |
| CN108121232A (en) * | 2016-11-28 | 2018-06-05 | 英业达科技有限公司 | Projection arrangement and projecting method |
| CN107147888A (en) * | 2017-05-16 | 2017-09-08 | 深圳市火乐科技发展有限公司 | One kind corrects distortion methods and device automatically using graph processing chips |
| CN107147888B (en) * | 2017-05-16 | 2020-06-02 | 深圳市火乐科技发展有限公司 | Method and device for automatically correcting distortion by utilizing graphics processing chip |
| CN109308684A (en) * | 2017-07-27 | 2019-02-05 | 成都理想境界科技有限公司 | A kind of image skew correction method and computer readable storage medium |
| CN109308684B (en) * | 2017-07-27 | 2022-03-08 | 成都理想境界科技有限公司 | Image tilt correction method and computer readable storage medium |
| CN107835399A (en) * | 2017-10-31 | 2018-03-23 | 潍坊歌尔电子有限公司 | The method, apparatus and projector equipment of a kind of projection correction |
| WO2020119633A1 (en) * | 2018-12-12 | 2020-06-18 | 中国科学院深圳先进技术研究院 | Automatic correction method and system for projected picture |
| CN110766615A (en) * | 2019-09-09 | 2020-02-07 | 北京美院帮网络科技有限公司 | Picture correction method, device, terminal and computer readable storage medium |
| CN110766615B (en) * | 2019-09-09 | 2023-07-14 | 北京美院帮网络科技有限公司 | Picture correction method, device, terminal and computer readable storage medium |
| CN114339172A (en) * | 2021-12-14 | 2022-04-12 | 青岛信芯微电子科技股份有限公司 | Projection correction method and device, projection equipment, chip and medium |
| CN114339172B (en) * | 2021-12-14 | 2024-04-09 | 青岛信芯微电子科技股份有限公司 | Projection correction method and device, projection equipment, chip and medium |
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Application publication date: 20111207 |