CN102271237A - Projection device and method for correcting trapezoidal distortion - Google Patents

Projection device and method for correcting trapezoidal distortion Download PDF

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Publication number
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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projection
projection arrangement
angle
length
ratio
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庄品洋
游银泉
吴星助
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Abstract

一种投影装置，该投影装置包括：一角度感测单元，用于感测投影装置的倾斜，并输出一电压值；一处理单元，根据该电压值确定该投影装置的倾斜角度，根据该倾斜角度及投影装置的投影角度计算该投影装置投射在投影屏幕上的投影区域的上边长及下边长的比例，并根据所计算的比例来确定一修正参数，通过该修正参数调整投影装置中投射前的图像，使得该图像的上边与下边的比例为该修正参数。本发明还提供一种矫正梯形失真的方法，通过该投影装置和方法，可以实现矫正梯形失真。

A projection device comprising: an angle sensing unit for sensing the inclination of the projection device and outputting a voltage value; a processing unit for determining the inclination angle of the projection device according to the voltage value, and according to the inclination Angle and the projection angle of the projection device Calculate the ratio of the upper side length and the lower side length of the projection area projected by the projection device on the projection screen, and determine a correction parameter according to the calculated ratio, and adjust the projection device in the projection device through the correction parameter. , so that the ratio of the top and bottom of the image is the correction parameter. The present invention also provides a method for correcting trapezoidal distortion, through the projection device and method, the correction of trapezoidal distortion can be realized.

Description

投影装置及其矫正梯形失真的方法Projection device and method for correcting trapezoidal distortion

技术领域 technical field

本发明涉及一种投影装置及矫正梯形失真的方法。The invention relates to a projection device and a method for correcting trapezoidal distortion.

背景技术 Background technique

在投影装置的日常使用中，投影装置的位置应该尽可能与投影屏幕成直角才能保证投影在投影屏幕上的画面为矩形。但是如果不能保证投影装置的位置和投影屏幕的垂直，投影在投影屏幕上的画面就会产生梯形失真。这样对用户的观看造成不便。In daily use of the projection device, the position of the projection device should be at right angles to the projection screen as much as possible to ensure that the picture projected on the projection screen is a rectangle. However, if the vertical position of the projection device and the projection screen cannot be ensured, trapezoidal distortion will occur on the picture projected on the projection screen. This causes inconvenience to the viewing of the user.

发明内容 Contents of the invention

有鉴于此，有必要提供一种投影装置，能矫正梯形失真。还有必要提供一种矫正梯形失真的方法。In view of this, it is necessary to provide a projection device capable of correcting keystone distortion. It is also necessary to provide a method of correcting keystone distortion.

一种投影装置，该投影装置包括：一角度感测单元，用于感测投影装置的倾斜，并输出一电压值；一处理单元，根据该电压值确定该投影装置的倾斜角度，根据该倾斜角度及投影装置的投影角度计算该投影装置投射在投影屏幕上的投影区域的上边长及下边长的比例，并根据所计算的比例来确定一修正参数，通过该修正参数调整投影装置中投射前的图像，使得该图像的上边与下边的比例为该修正参数。A projection device, the projection device comprising: an angle sensing unit for sensing the inclination of the projection device and outputting a voltage value; a processing unit for determining the inclination angle of the projection device according to the voltage value, and according to the inclination The angle and the projection angle of the projection device calculate the ratio of the upper side length and the lower side length of the projection area projected by the projection device on the projection screen, and determine a correction parameter according to the calculated ratio, and adjust the projection device in the projection device through the correction parameter. , so that the ratio of the top and bottom of the image is the correction parameter.

一种矫正梯形失真的方法，该方法应用于一投影装置，该投影装置包括一角度感测单元，该角度感测单元用于感测该投影装置的倾斜，并输出一电压值，该方法还包括：根据该电压值确定该投影装置的倾斜角度；根据该倾斜角度及投影装置的投影角度来计算该投影装置投射在投影屏幕上的投影区域的上边长与下边长的比例；通过该投影装置投射在投影屏幕上的投影区域的上边长与下边长的比例来计算修正参数；通过该修正参数相应的变形该图像，使得该图像的上边长与下边长的比例为该修正参数。A method for correcting trapezoidal distortion, the method is applied to a projection device, the projection device includes an angle sensing unit, the angle sensing unit is used to sense the inclination of the projection device, and output a voltage value, the method also Including: 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 the projection area projected by the projection device on the projection screen according to the tilt angle and the projection angle of the projection device; The correction parameter is calculated by the ratio of the upper side length to the lower side length of the projection area projected on the projection screen; the image is deformed correspondingly through the correction parameter, so that the ratio of the upper side length to the lower side length of the image is the correction parameter.

角度感测单元感测投影装置的倾斜并输出一电压值，该处理单元根据该电压值计算该投影装置的倾斜角度，该处理单元根据该投影装置的倾斜角度计算该投影装置投射在投影屏幕上的上边长和下边长的比例，并通过该比例计算修正参数，通过该修正参数修正该待投射图像。从而实现修正梯形失真。The angle sensing unit senses the inclination of the projection device and outputs a voltage value, the processing unit calculates the inclination angle of the projection device according to the voltage value, and the processing unit calculates the projection device projected on the projection screen according to the inclination angle of the projection device The ratio of the length of the upper side to the length of the lower side, and the correction parameter is calculated according to the ratio, and the image to be projected is corrected by the correction parameter. Thereby correcting the trapezoidal distortion is realized.

附图说明 Description of drawings

图1是本发明一实施方式中投影装置方框示意图。FIG. 1 is a block diagram of a projection device in an embodiment of the present invention.

图2是如图1所示的重力感测器输出的电压与角度的对应关系图。FIG. 2 is a diagram showing the corresponding relationship between the voltage output by the gravity sensor and the angle as shown in FIG. 1 .

图3是如图1所示的投影装置无镜头平移功能的计算示意图。FIG. 3 is a schematic diagram of calculation of the projection device shown in FIG. 1 without a lens shift function.

图4是如图1所示的投影装置无镜头平移功能的计算原理示意图。FIG. 4 is a schematic diagram of the calculation principle of the projection device shown in FIG. 1 without a lens shift function.

图5是如图1所示的投影装置有镜头平移功能的计算示意图。FIG. 5 is a schematic diagram of calculation of the projection device shown in FIG. 1 with a lens shift function.

图6是如图1所示的投影装置有镜头平移功能的计算原理示意图。FIG. 6 is a schematic diagram of the calculation principle of the projection device shown in FIG. 1 having a lens shift function.

图7是本发明一实施方式中投影装置矫正梯形失真方法流程图。FIG. 7 is a flowchart of a method for correcting trapezoidal distortion by a projection device in an embodiment of the present invention.

主要元件符号说明Description of main component symbols

  投影装置 Projection device   100 100   角度感测单元 Angle sensing unit   10 10   存储单元 storage unit   20 20   处理单元 processing unit   30 30

具体实施方式 Detailed ways

请参考图1，为本发明一实施方式的投影装置100方框示意图。该投影装置100包括一角度感测单元10、一存储单元20及一处理单元30。Please refer to FIG. 1 , which is a schematic block diagram of a projection device 100 according to an embodiment of the present invention. The projection device 100 includes an angle sensing unit 10 , a storage unit 20 and a processing unit 30 .

该角度感测单元10用于感测投影装置100与水平方向的夹角。本实施方式中，该角度感测单元10为重力感测器(G-sensor)，在该重力感测器的角度改变时，该重力感测器所感应的重力方向不同，即会有不同的电压输出。该重力感测器角度量测的范围在-90度到90度之间，该角度量测范围所对应的输出电压值范围为1.3伏到3.7伏。The angle sensing unit 10 is used for sensing the angle between the projection device 100 and the horizontal direction. In this embodiment, the angle sensing unit 10 is a gravity sensor (G-sensor). When the angle of the gravity sensor changes, the direction of gravity sensed by the gravity sensor is different, that is, there will be different voltage output. The angle measurement range of the gravity sensor is between -90 degrees and 90 degrees, and the output voltage corresponding to the angle measurement range is 1.3 volts to 3.7 volts.

该存储单元20中存储有该重力感测器量测的角度与输出电压之间的对应关系。本实施方式中，该重力感测器量测的角度与输出电压之间的对应关系以图2所示的图表示。The storage unit 20 stores the corresponding relationship between the angle measured by the gravity sensor and the output voltage. In this embodiment, the corresponding relationship between the angle measured by the gravity sensor and the output voltage is represented by the graph shown in FIG. 2 .

该处理单元30与该角度感测单元10电连接。该处理单元30响应用户的操作确定该投影装置100的倾斜角度(即与水平方向的夹角)。本实施方式中，该处理单元30首先确定重力感测器输出的电压值，然后根据该重力感测器输出的电压值及该存储单元20中存储的重力感测器量测的角度与输出电压之间的对应关系确定该投影装置100的倾斜角度。The processing unit 30 is electrically connected to the angle sensing unit 10 . The processing unit 30 determines the tilt angle (ie, the angle with the horizontal direction) of the projection device 100 in response to the user's operation. In this embodiment, the processing unit 30 first determines the voltage value output by the gravity sensor, and then according to the voltage value output by the gravity sensor and the angle measured by the gravity sensor stored in the storage unit 20 and the output voltage The corresponding relationship between determines the tilt angle of the projection device 100 .

该处理单元30根据投影装置100的倾斜角度及投影装置100的投影角度计算该投影装置100投射在投影屏幕上的图像上边长和下边长比例，并根据该比例计算一修正参数，该修正参数为该投影装置100投射在投影屏幕上的图像上边长和下边长比例的倒数，对该修正参数的计算请参照图3至图6。在修正参数确定之后，则处理单元30根据该修正参数对投影装置100中投射前的图像进行调整，将该图像变形成上下边比例为该修正参数，且该图像呈梯形，从而投射到投影屏幕上的图像的上边与下边的比例为1，实现了梯形矫正。例如，当计算该修正参数为1∶2，则对根据该修正参数对投影装置100中投射前的图像进行调整，使投影装置投射前的图像的上边和下边的比例为1∶2。The processing unit 30 calculates the ratio of the upper side length to the lower side length of the image projected by the projection device 100 on the projection screen according to the inclination angle of the projection device 100 and the projection angle of the projection device 100, and calculates a correction parameter according to the ratio, and the correction parameter is The reciprocal of the ratio of the upper side length to the lower side length of the image projected by the projection device 100 on the projection screen, please refer to FIG. 3 to FIG. 6 for calculation of the correction parameter. After the correction parameter is determined, the processing unit 30 adjusts the image before projection in the projection device 100 according to the correction parameter, and deforms the image so that the ratio of the upper and lower sides is the correction parameter, and the image is trapezoidal, so that it is projected onto the projection screen The ratio of the upper side to the lower side of the image above is 1, which achieves trapezoidal correction. For example, when the correction parameter is calculated to be 1:2, the image before projection in the projection device 100 is adjusted according to the correction parameter, so that the ratio of the upper side and the lower side of the image before projection by the projection device is 1:2.

图3和图4为投影装置100没有镜头平移功能时计算该投影装置100投射在投影屏幕上的上边长和下边长比例的方法的示意图。当该投影装置100没有镜头平移功能时，该投影装置100投射在投影屏幕的投影区域相对于该投影装置100分布在投影装置100的上下方。如图3，当该投影装置100有倾角时，由于该投影装置100投射在投影屏幕的上边的两个顶点分别与该投影装置100之间所形成的两条边X之间的夹角与和下边的两个顶点与该投影装置100之间所形成的两条边Y之间的夹角一致，则可得出该投影装置100投射在投影屏幕上的投影区域的上边长Z与该投影装置100投射在投影屏幕上的投影区域的下边长Z’的比例即为该投影装置100投射在投影区域的同一侧边的两个顶点与该投影装置100所形成的边长比X/Y。请参考图4，设该投影装置100投影角度为2θ，投影半角为θ，投影装置与该投影屏幕之间的距离为L，该角度感测单元10感测的投影装置100的倾斜角度为β。设该投影装置100投射出的边长分别为X和Y，则可得X＝L/cos(θ+β)和Y＝L/cos(θ-β)，那么修正参数为：Y/X＝(L/cos(θ-β))/(L/cos(θ+β))＝cos(θ+β)/cos(θ-β)。3 and 4 are schematic diagrams of a method for calculating the ratio of the upper side length and the lower side length projected by the projection device 100 on the projection screen when the projection device 100 has no lens shift function. When the projection device 100 has no lens shift function, the projection area projected by the projection device 100 on the projection screen is distributed above and below the projection device 100 relative to the projection device 100 . As shown in Figure 3, when the projection device 100 has an inclination angle, since the two vertices projected by the projection device 100 on the upper side of the projection screen and the two sides X formed between the projection device 100 and the The two vertices of the lower side are consistent with the angle between the two sides Y formed between the projection device 100, then it can be obtained that the upper side length Z of the projection area projected by the projection device 100 on the projection screen is the same as the length Z of the projection device 100. The ratio of the length Z' of the lower side of the projection area projected by 100 on the projection screen is the side length ratio X/Y formed by the two vertices projected on the same side of the projection area by the projection device 100 and the projection device 100 . Please refer to FIG. 4 , assuming that the projection device 100 has a projection angle of 2θ, a projection half-angle of θ, the distance between the projection device and the projection screen is L, and the angle of inclination of the projection device 100 sensed by the angle sensing unit 10 is β. . Assuming that the side lengths projected by the projection device 100 are X and Y respectively, then X=L/cos(θ+β) and Y=L/cos(θ-β) can be obtained, then the correction parameters are: Y/X= (L/cos(θ-β))/(L/cos(θ+β))=cos(θ+β)/cos(θ-β).

图5和图6为投影装置100具有镜头平移功能时计算该投影装置100投射在投影屏幕上的上边长和下边长比例的方法的示意图。当该投影装置100有镜头平移功能时，该投影装置100投射在投影屏幕的投影区域相对于投影装置100，在投影装置100的上方。请参考图5，在该投影装置100有倾角时，投射在投影屏幕的上边的两个顶点分别与该投影装置100之间所形成的两条边X之间的夹角与和下边的两个顶点分别与该投影装置100之间所形成的两条边Y之间的夹角一致，则可得出该投影装置100投射在投影屏幕上的投影区域的上边长Z与该投影装置100投射在投影屏幕上的投影区域的下边长Z’的比例即为该投影装置100投射在投影区域的同一侧边的两个顶点分别与该投影装置100之间所形成的边长比X/Y。请参考图6，设该投影装置100投射角度为2θ，该角度感测单元10感测的投影装置100的倾斜角度为β，则该投影装置100投射在投影区域的同一侧边的两个顶点分别与该投影装置100之间所形成的边长分别为X＝L/cos(2θ+β)和Y＝L/cosβ，则修正参数为：Y/X＝(L/cosβ)/(L/cos(2θ+β))＝cos(2θ+β)/cosβ。5 and 6 are schematic diagrams of a method for calculating the ratio of the upper side length and the lower side length projected by the projection device 100 on the projection screen when the projection device 100 has a lens shift function. When the projection device 100 has a lens shift function, the projection area projected by the projection device 100 on the projection screen is above the projection device 100 relative to the projection device 100 . Please refer to FIG. 5 , when the projection device 100 has an inclination angle, the angle between the two vertices projected on the upper side of the projection screen and the two sides X formed between the projection device 100 and the two sides of the lower side The vertices are respectively consistent with the included angles between the two sides Y formed between the projection devices 100, then it can be concluded that the upper side length Z of the projection area projected by the projection device 100 on the projection screen is the same as that projected by the projection device 100 at The ratio of the lower side length Z' of the projection area on the projection screen is the side length ratio X/Y formed between two vertices projected by the projection device 100 on the same side of the projection area and the projection device 100 respectively. Please refer to FIG. 6 , assuming that the projection device 100 has a projection angle of 2θ, and the angle of inclination of the projection device 100 sensed by the angle sensing unit 10 is β, then the projection device 100 projects two vertices on the same side of the projection area. The side lengths formed between the projection device 100 are respectively X=L/cos(2θ+β) and Y=L/cosβ, then the correction parameters are: Y/X=(L/cosβ)/(L/ cos(2θ+β))=cos(2θ+β)/cosβ.

请参考图7，为本发明一实施方式中投影装置100矫正梯形失真方法流程图。Please refer to FIG. 7 , which is a flowchart of a method for correcting keystone distortion by the projection device 100 in an embodiment of the present invention.

在步骤S701中，该处理单元30确定该投影装置100的倾斜角度。在本实施方式中，该处理单元30根据该重力感测器输出的电压值及该存储单元20中存储的重力感测器量测的角度与输出电压之间的对应关系来确定该投影装置100的倾斜角度。In step S701 , the processing unit 30 determines the tilt angle of the projection device 100 . In this embodiment, the processing unit 30 determines the projection device 100 according to the voltage value output by the gravity sensor and the corresponding relationship between the angle measured by the gravity sensor and the output voltage stored in the storage unit 20. the angle of inclination.

在步骤S702中，该处理单元30根据该投影装置的倾斜角度该投影装置的投影角度计算该投影装置100投射在投影屏幕上的投影区域的上边长与该投影装置100投射在投影屏幕上的投影区域的下边长的比例。In step S702, the processing unit 30 calculates the length of the upper side of the projection area projected by the projection device 100 on the projection screen and the projection of the projection device 100 on the projection screen according to the tilt angle of the projection device and the projection angle of the projection device. The ratio of the lower side length of the region.

在步骤S703中，该处理单元30根据该投影装置100投射在投影屏幕上的上边长和下边长的比例计算该修正参数。该修正参数为投射区域的上边长和下边长的比例的倒数。In step S703, the processing unit 30 calculates the correction parameter according to the ratio of the upper side length and the lower side length projected by the projection device 100 on the projection screen. The correction parameter is the reciprocal of the ratio of the upper side length to the lower side length of the projection area.

在步骤S704中，该处理单元30根据该修正参数将该图像进行相应的变形，使得该图像的上边与下边的比例为该修正参数，且该图像呈梯形。In step S704, the processing unit 30 deforms the image correspondingly according to the correction parameter, so that the ratio of the top side and the bottom side of the image is the correction parameter, and the image is trapezoidal.

本技术领域的普通技术人员应当认识到，以上的实施方式仅是用来说明本发明，而并非用作为对本发明的限定，只要在本发明的实质精神范围之内，对以上实施例所作的适当改变和变化都落在本发明要求保护的范围之内。Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Alterations and variations are within the scope of the claimed 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.
CN2011100457263A 2011-02-25 2011-02-25 Projection device and method for correcting trapezoidal distortion Pending CN102271237A (en)

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CN109308684A (en) * 2017-07-27 2019-02-05 成都理想境界科技有限公司 A kind of image tilt correction method and computer readable storage medium
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Application publication date: 20111207